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ARM development updates for 5.18:

Browse Source 
Updates for IRQ stacks and virtually mapped stack support for ARM from
 the following pull requests, etc:
 
 1) ARM: support for IRQ and vmap'ed stacks
 
 This PR covers all the work related to implementing IRQ stacks and
 vmap'ed stacks for all 32-bit ARM systems that are currently supported
 by the Linux kernel, including RiscPC and Footbridge. It has been
 submitted for review in three different waves:
 - IRQ stacks support for v7 SMP systems [0],
 - vmap'ed stacks support for v7 SMP systems[1],
 - extending support for both IRQ stacks and vmap'ed stacks for all
   remaining configurations, including v6/v7 SMP multiplatform kernels
   and uniprocessor configurations including v7-M [2]
 
 [0] https://lore.kernel.org/linux-arm-kernel/20211115084732.3704393-1-ardb@kernel.org/
 [1] https://lore.kernel.org/linux-arm-kernel/20211122092816.2865873-1-ardb@kernel.org/
 [2] https://lore.kernel.org/linux-arm-kernel/20211206164659.1495084-1-ardb@kernel.org/
 
 2) ARM: support for IRQ and vmap'ed stacks [v6]
 
 This tag covers the changes between the version of vmap'ed + IRQ stacks
 support pulled into rmk/devel-stable [0] (which was dropped from v5.17
 due to issues discovered too late in the cycle), and my v5 proposed for
 the v5.18 cycle [1].
 
 [0] git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git arm-irq-and-vmap-stacks-for-rmk
 [1] https://lore.kernel.org/linux-arm-kernel/20220124174744.1054712-1-ardb@kernel.org/
 
 3) ARM: ftrace fixes and cleanups
 
 Make all flavors of ftrace available on all builds, regardless of ISA
 choice, unwinder choice or compiler:
 - use ADD not POP where possible
 - fix a couple of Thumb2 related issues
 - enable HAVE_FUNCTION_GRAPH_FP_TEST for robustness
 - enable the graph tracer with the EABI unwinder
 - avoid clobbering frame pointer registers to make Clang happy
 
 Link: https://lore.kernel.org/linux-arm-kernel/20220203082204.1176734-1-ardb@kernel.org/
 
 4) Fixes for the above.
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Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm

Pull ARM updates from Russell King:
 "Updates for IRQ stacks and virtually mapped stack support, and ftrace:

   - Support for IRQ and vmap'ed stacks

     This covers all the work related to implementing IRQ stacks and
     vmap'ed stacks for all 32-bit ARM systems that are currently
     supported by the Linux kernel, including RiscPC and Footbridge. It
     has been submitted for review in four different waves:

      - IRQ stacks support for v7 SMP systems [0]

      - vmap'ed stacks support for v7 SMP systems[1]

      - extending support for both IRQ stacks and vmap'ed stacks for all
        remaining configurations, including v6/v7 SMP multiplatform
        kernels and uniprocessor configurations including v7-M [2]

      - fixes and updates in [3]

   - ftrace fixes and cleanups

     Make all flavors of ftrace available on all builds, regardless of
     ISA choice, unwinder choice or compiler [4]:

      - use ADD not POP where possible

      - fix a couple of Thumb2 related issues

      - enable HAVE_FUNCTION_GRAPH_FP_TEST for robustness

      - enable the graph tracer with the EABI unwinder

      - avoid clobbering frame pointer registers to make Clang happy

   - Fixes for the above"

[0] https://lore.kernel.org/linux-arm-kernel/20211115084732.3704393-1-ardb@kernel.org/
[1] https://lore.kernel.org/linux-arm-kernel/20211122092816.2865873-1-ardb@kernel.org/
[2] https://lore.kernel.org/linux-arm-kernel/20211206164659.1495084-1-ardb@kernel.org/
[3] https://lore.kernel.org/linux-arm-kernel/20220124174744.1054712-1-ardb@kernel.org/
[4] https://lore.kernel.org/linux-arm-kernel/20220203082204.1176734-1-ardb@kernel.org/

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (62 commits)
  ARM: fix building NOMMU ARMv4/v5 kernels
  ARM: unwind: only permit stack switch when unwinding call_with_stack()
  ARM: Revert "unwind: dump exception stack from calling frame"
  ARM: entry: fix unwinder problems caused by IRQ stacks
  ARM: unwind: set frame.pc correctly for current-thread unwinding
  ARM: 9184/1: return_address: disable again for CONFIG_ARM_UNWIND=y
  ARM: 9183/1: unwind: avoid spurious warnings on bogus code addresses
  Revert "ARM: 9144/1: forbid ftrace with clang and thumb2_kernel"
  ARM: mach-bcm: disable ftrace in SMC invocation routines
  ARM: cacheflush: avoid clobbering the frame pointer
  ARM: kprobes: treat R7 as the frame pointer register in Thumb2 builds
  ARM: ftrace: enable the graph tracer with the EABI unwinder
  ARM: unwind: track location of LR value in stack frame
  ARM: ftrace: enable HAVE_FUNCTION_GRAPH_FP_TEST
  ARM: ftrace: avoid unnecessary literal loads
  ARM: ftrace: avoid redundant loads or clobbering IP
  ARM: ftrace: use trampolines to keep .init.text in branching range
  ARM: ftrace: use ADD not POP to counter PUSH at entry
  ARM: ftrace: ensure that ADR takes the Thumb bit into account
  ARM: make get_current() and __my_cpu_offset() __always_inline
  ...
This commit is contained in:
Linus Torvalds 2022-03-23 17:35:57 -07:00
commit 9c0e6a89b5
75 changed files with 1436 additions and 866 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
arch/arm/Kconfig
View File

@ -60,6 +60,7 @@ config ARM
select GENERIC_CPU_AUTOPROBE
select GENERIC_EARLY_IOREMAP
select GENERIC_IDLE_POLL_SETUP
select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select GENERIC_IRQ_SHOW_LEVEL
@ -94,8 +95,8 @@ config ARM
select HAVE_EXIT_THREAD
select HAVE_FAST_GUP if ARM_LPAE
select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
select HAVE_FUNCTION_GRAPH_TRACER if !THUMB2_KERNEL && !CC_IS_CLANG
select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !(THUMB2_KERNEL && CC_IS_CLANG)
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER if !XIP_KERNEL
select HAVE_GCC_PLUGINS
select HAVE_HW_BREAKPOINT if PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)
select HAVE_IRQ_TIME_ACCOUNTING
@ -129,7 +130,8 @@ config ARM
select PERF_USE_VMALLOC
select RTC_LIB
select SYS_SUPPORTS_APM_EMULATION
select THREAD_INFO_IN_TASK if CURRENT_POINTER_IN_TPIDRURO
select THREAD_INFO_IN_TASK
select HAVE_ARCH_VMAP_STACK if MMU && ARM_HAS_GROUP_RELOCS
select TRACE_IRQFLAGS_SUPPORT if !CPU_V7M
# Above selects are sorted alphabetically; please add new ones
# according to that. Thanks.
@ -141,6 +143,17 @@ config ARM
Europe. There is an ARM Linux project with a web page at
<http://www.arm.linux.org.uk/>.
config ARM_HAS_GROUP_RELOCS
def_bool y
depends on !LD_IS_LLD || LLD_VERSION >= 140000
depends on !COMPILE_TEST
help
Whether or not to use R_ARM_ALU_PC_Gn or R_ARM_LDR_PC_Gn group
relocations, which have been around for a long time, but were not
supported in LLD until version 14. The combined range is -/+ 256 MiB,
which is usually sufficient, but not for allyesconfig, so we disable
this feature when doing compile testing.
config ARM_HAS_SG_CHAIN
bool
@ -229,9 +242,6 @@ config GENERIC_ISA_DMA
config FIQ
bool
config NEED_RET_TO_USER
bool
config ARCH_MTD_XIP
bool
@ -325,7 +335,6 @@ config ARCH_MULTIPLATFORM
select AUTO_ZRELADDR
select TIMER_OF
select COMMON_CLK
select GENERIC_IRQ_MULTI_HANDLER
select HAVE_PCI
select PCI_DOMAINS_GENERIC if PCI
select SPARSE_IRQ
@ -349,7 +358,6 @@ config ARCH_EP93XX
select ARM_AMBA
imply ARM_PATCH_PHYS_VIRT
select ARM_VIC
select GENERIC_IRQ_MULTI_HANDLER
select AUTO_ZRELADDR
select CLKSRC_MMIO
select CPU_ARM920T
@ -374,7 +382,6 @@ config ARCH_IOP32X
select CPU_XSCALE
select GPIO_IOP
select GPIOLIB
select NEED_RET_TO_USER
select FORCE_PCI
select PLAT_IOP
help
@ -388,7 +395,6 @@ config ARCH_IXP4XX
select ARCH_SUPPORTS_BIG_ENDIAN
select CPU_XSCALE
select DMABOUNCE if PCI
select GENERIC_IRQ_MULTI_HANDLER
select GPIO_IXP4XX
select GPIOLIB
select HAVE_PCI
@ -404,7 +410,6 @@ config ARCH_IXP4XX
config ARCH_DOVE
bool "Marvell Dove"
select CPU_PJ4
select GENERIC_IRQ_MULTI_HANDLER
select GPIOLIB
select HAVE_PCI
select MVEBU_MBUS
@ -427,7 +432,6 @@ config ARCH_PXA
select CLKSRC_MMIO
select TIMER_OF
select CPU_XSCALE if !CPU_XSC3
select GENERIC_IRQ_MULTI_HANDLER
select GPIO_PXA
select GPIOLIB
select IRQ_DOMAIN
@ -466,7 +470,6 @@ config ARCH_SA1100
select COMMON_CLK
select CPU_FREQ
select CPU_SA1100
select GENERIC_IRQ_MULTI_HANDLER
select GPIOLIB
select IRQ_DOMAIN
select ISA
@ -481,7 +484,6 @@ config ARCH_S3C24XX
select CLKSRC_SAMSUNG_PWM
select GPIO_SAMSUNG
select GPIOLIB
select GENERIC_IRQ_MULTI_HANDLER
select NEED_MACH_IO_H
select S3C2410_WATCHDOG
select SAMSUNG_ATAGS
@ -499,7 +501,6 @@ config ARCH_OMAP1
select ARCH_OMAP
select CLKSRC_MMIO
select GENERIC_IRQ_CHIP
select GENERIC_IRQ_MULTI_HANDLER
select GPIOLIB
select HAVE_LEGACY_CLK
select IRQ_DOMAIN
@ -1166,7 +1167,12 @@ config SMP_ON_UP
config CURRENT_POINTER_IN_TPIDRURO
def_bool y
depends on SMP && CPU_32v6K && !CPU_V6
depends on CPU_32v6K && !CPU_V6
config IRQSTACKS
def_bool y
select HAVE_IRQ_EXIT_ON_IRQ_STACK
select HAVE_SOFTIRQ_ON_OWN_STACK
config ARM_CPU_TOPOLOGY
bool "Support cpu topology definition"
@ -1607,10 +1613,14 @@ config XEN
help
Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
config CC_HAVE_STACKPROTECTOR_TLS
def_bool $(cc-option,-mtp=cp15 -mstack-protector-guard=tls -mstack-protector-guard-offset=0)
config STACKPROTECTOR_PER_TASK
bool "Use a unique stack canary value for each task"
depends on GCC_PLUGINS && STACKPROTECTOR && THREAD_INFO_IN_TASK && !XIP_DEFLATED_DATA
select GCC_PLUGIN_ARM_SSP_PER_TASK
depends on STACKPROTECTOR && CURRENT_POINTER_IN_TPIDRURO && !XIP_DEFLATED_DATA
depends on GCC_PLUGINS || CC_HAVE_STACKPROTECTOR_TLS
select GCC_PLUGIN_ARM_SSP_PER_TASK if !CC_HAVE_STACKPROTECTOR_TLS
default y
help
Due to the fact that GCC uses an ordinary symbol reference from

2
arch/arm/Kconfig.debug
View File

@ -65,7 +65,7 @@ config UNWINDER_FRAME_POINTER
config UNWINDER_ARM
bool "ARM EABI stack unwinder"
depends on AEABI && !FUNCTION_GRAPH_TRACER
depends on AEABI
select ARM_UNWIND
help
This option enables stack unwinding support in the kernel

9
arch/arm/Makefile
View File

@ -275,6 +275,14 @@ endif
ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
prepare: stack_protector_prepare
ifeq ($(CONFIG_CC_HAVE_STACKPROTECTOR_TLS),y)
stack_protector_prepare: prepare0
$(eval KBUILD_CFLAGS += \
-mstack-protector-guard=tls \
-mstack-protector-guard-offset=$(shell \
awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}'\
include/generated/asm-offsets.h))
else
stack_protector_prepare: prepare0
$(eval SSP_PLUGIN_CFLAGS := \
-fplugin-arg-arm_ssp_per_task_plugin-offset=$(shell \
@ -283,6 +291,7 @@ stack_protector_prepare: prepare0
$(eval KBUILD_CFLAGS += $(SSP_PLUGIN_CFLAGS))
$(eval GCC_PLUGINS_CFLAGS += $(SSP_PLUGIN_CFLAGS))
endif
endif
all: $(notdir $(KBUILD_IMAGE))

6
arch/arm/boot/compressed/Makefile
View File

@ -92,17 +92,13 @@ ifeq ($(CONFIG_USE_OF),y)
OBJS += $(libfdt_objs) fdt_check_mem_start.o
endif
# -fstack-protector-strong triggers protection checks in this code,
# but it is being used too early to link to meaningful stack_chk logic.
$(foreach o, $(libfdt_objs) atags_to_fdt.o fdt_check_mem_start.o, \
$(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector))
targets := vmlinux vmlinux.lds piggy_data piggy.o \
head.o $(OBJS)
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
-I$(srctree)/scripts/dtc/libfdt -fno-stack-protector \
-I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg
asflags-y := -DZIMAGE

7
arch/arm/boot/compressed/misc.c
View File

@ -128,13 +128,6 @@ asmlinkage void __div0(void)
error("Attempting division by 0!");
}
const unsigned long __stack_chk_guard = 0x000a0dff;
void __stack_chk_fail(void)
{
error("stack-protector: Kernel stack is corrupted\n");
}
extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));

204
arch/arm/include/asm/assembler.h
View File

@ -86,6 +86,10 @@
#define IMM12_MASK 0xfff
/* the frame pointer used for stack unwinding */
ARM( fpreg .req r11 )
THUMB( fpreg .req r7 )
/*
* Enable and disable interrupts
*/
@ -209,43 +213,12 @@
.endm
.endr
.macro get_current, rd
#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO
mrc p15, 0, \rd, c13, c0, 3 @ get TPIDRURO register
#else
get_thread_info \rd
ldr \rd, [\rd, #TI_TASK]
#endif
.endm
.macro set_current, rn
#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO
mcr p15, 0, \rn, c13, c0, 3 @ set TPIDRURO register
#endif
.endm
.macro reload_current, t1:req, t2:req
#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO
adr_l \t1, __entry_task @ get __entry_task base address
mrc p15, 0, \t2, c13, c0, 4 @ get per-CPU offset
ldr \t1, [\t1, \t2] @ load variable
mcr p15, 0, \t1, c13, c0, 3 @ store in TPIDRURO
#endif
.endm
/*
* Get current thread_info.
*/
.macro get_thread_info, rd
#ifdef CONFIG_THREAD_INFO_IN_TASK
/* thread_info is the first member of struct task_struct */
get_current \rd
#else
ARM( mov \rd, sp, lsr #THREAD_SIZE_ORDER + PAGE_SHIFT )
THUMB( mov \rd, sp )
THUMB( lsr \rd, \rd, #THREAD_SIZE_ORDER + PAGE_SHIFT )
mov \rd, \rd, lsl #THREAD_SIZE_ORDER + PAGE_SHIFT
#endif
.endm
/*
@ -320,6 +293,80 @@
#define ALT_UP_B(label) b label
#endif
/*
* this_cpu_offset - load the per-CPU offset of this CPU into
* register 'rd'
*/
.macro this_cpu_offset, rd:req
#ifdef CONFIG_SMP
ALT_SMP(mrc p15, 0, \rd, c13, c0, 4)
#ifdef CONFIG_CPU_V6
ALT_UP_B(.L1_\@)
.L0_\@:
.subsection 1
.L1_\@: ldr_va \rd, __per_cpu_offset
b .L0_\@
.previous
#endif
#else
mov \rd, #0
#endif
.endm
/*
* set_current - store the task pointer of this CPU's current task
*/
.macro set_current, rn:req, tmp:req
#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)
9998: mcr p15, 0, \rn, c13, c0, 3 @ set TPIDRURO register
#ifdef CONFIG_CPU_V6
ALT_UP_B(.L0_\@)
.subsection 1
.L0_\@: str_va \rn, __current, \tmp
b .L1_\@
.previous
.L1_\@:
#endif
#else
str_va \rn, __current, \tmp
#endif
.endm
/*
* get_current - load the task pointer of this CPU's current task
*/
.macro get_current, rd:req
#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)
9998: mrc p15, 0, \rd, c13, c0, 3 @ get TPIDRURO register
#ifdef CONFIG_CPU_V6
ALT_UP_B(.L0_\@)
.subsection 1
.L0_\@: ldr_va \rd, __current
b .L1_\@
.previous
.L1_\@:
#endif
#else
ldr_va \rd, __current
#endif
.endm
/*
* reload_current - reload the task pointer of this CPU's current task
* into the TLS register
*/
.macro reload_current, t1:req, t2:req
#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)
#ifdef CONFIG_CPU_V6
ALT_SMP(nop)
ALT_UP_B(.L0_\@)
#endif
ldr_this_cpu \t1, __entry_task, \t1, \t2
mcr p15, 0, \t1, c13, c0, 3 @ store in TPIDRURO
.L0_\@:
#endif
.endm
/*
* Instruction barrier
*/
@ -576,12 +623,12 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
/*
* mov_l - move a constant value or [relocated] address into a register
*/
.macro mov_l, dst:req, imm:req
.macro mov_l, dst:req, imm:req, cond
.if __LINUX_ARM_ARCH__ < 7
ldr \dst, =\imm
ldr\cond \dst, =\imm
.else
movw \dst, #:lower16:\imm
movt \dst, #:upper16:\imm
movw\cond \dst, #:lower16:\imm
movt\cond \dst, #:upper16:\imm
.endif
.endm
@ -619,6 +666,78 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
__adldst_l str, \src, \sym, \tmp, \cond
.endm
.macro __ldst_va, op, reg, tmp, sym, cond
#if __LINUX_ARM_ARCH__ >= 7 || \
!defined(CONFIG_ARM_HAS_GROUP_RELOCS) || \
(defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS))
mov_l \tmp, \sym, \cond
\op\cond \reg, [\tmp]
#else
/*
* Avoid a literal load, by emitting a sequence of ADD/LDR instructions
* with the appropriate relocations. The combined sequence has a range
* of -/+ 256 MiB, which should be sufficient for the core kernel and
* for modules loaded into the module region.
*/
.globl \sym
.reloc .L0_\@, R_ARM_ALU_PC_G0_NC, \sym
.reloc .L1_\@, R_ARM_ALU_PC_G1_NC, \sym
.reloc .L2_\@, R_ARM_LDR_PC_G2, \sym
.L0_\@: sub\cond \tmp, pc, #8
.L1_\@: sub\cond \tmp, \tmp, #4
.L2_\@: \op\cond \reg, [\tmp, #0]
#endif
.endm
/*
* ldr_va - load a 32-bit word from the virtual address of \sym
*/
.macro ldr_va, rd:req, sym:req, cond
__ldst_va ldr, \rd, \rd, \sym, \cond
.endm
/*
* str_va - store a 32-bit word to the virtual address of \sym
*/
.macro str_va, rn:req, sym:req, tmp:req, cond
__ldst_va str, \rn, \tmp, \sym, \cond
.endm
/*
* ldr_this_cpu_armv6 - Load a 32-bit word from the per-CPU variable 'sym',
* without using a temp register. Supported in ARM mode
* only.
*/
.macro ldr_this_cpu_armv6, rd:req, sym:req
this_cpu_offset \rd
.globl \sym
.reloc .L0_\@, R_ARM_ALU_PC_G0_NC, \sym
.reloc .L1_\@, R_ARM_ALU_PC_G1_NC, \sym
.reloc .L2_\@, R_ARM_LDR_PC_G2, \sym
add \rd, \rd, pc
.L0_\@: sub \rd, \rd, #4
.L1_\@: sub \rd, \rd, #0
.L2_\@: ldr \rd, [\rd, #4]
.endm
/*
* ldr_this_cpu - Load a 32-bit word from the per-CPU variable 'sym'
* into register 'rd', which may be the stack pointer,
* using 't1' and 't2' as general temp registers. These
* are permitted to overlap with 'rd' if != sp
*/
.macro ldr_this_cpu, rd:req, sym:req, t1:req, t2:req
#if __LINUX_ARM_ARCH__ >= 7 || \
!defined(CONFIG_ARM_HAS_GROUP_RELOCS) || \
(defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS))
this_cpu_offset \t1
mov_l \t2, \sym
ldr \rd, [\t1, \t2]
#else
ldr_this_cpu_armv6 \rd, \sym
#endif
.endm
/*
* rev_l - byte-swap a 32-bit value
*
@ -636,4 +755,19 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
.endif
.endm
/*
* bl_r - branch and link to register
*
* @dst: target to branch to
* @c: conditional opcode suffix
*/
.macro bl_r, dst:req, c
.if __LINUX_ARM_ARCH__ < 6
mov\c lr, pc
mov\c pc, \dst
.else
blx\c \dst
.endif
.endm
#endif /* __ASM_ASSEMBLER_H__ */

12
arch/arm/include/asm/cacheflush.h
View File

@ -445,15 +445,10 @@ static inline void __sync_cache_range_r(volatile void *p, size_t size)
* however some exceptions may exist. Caveat emptor.
*
* - The clobber list is dictated by the call to v7_flush_dcache_*.
* fp is preserved to the stack explicitly prior disabling the cache
* since adding it to the clobber list is incompatible with having
* CONFIG_FRAME_POINTER=y. ip is saved as well if ever r12-clobbering
* trampoline are inserted by the linker and to keep sp 64-bit aligned.
*/
#define v7_exit_coherency_flush(level) \
asm volatile( \
".arch armv7-a \n\t" \
"stmfd sp!, {fp, ip} \n\t" \
"mrc p15, 0, r0, c1, c0, 0 @ get SCTLR \n\t" \
"bic r0, r0, #"__stringify(CR_C)" \n\t" \
"mcr p15, 0, r0, c1, c0, 0 @ set SCTLR \n\t" \
@ -463,10 +458,9 @@ static inline void __sync_cache_range_r(volatile void *p, size_t size)
"bic r0, r0, #(1 << 6) @ disable local coherency \n\t" \
"mcr p15, 0, r0, c1, c0, 1 @ set ACTLR \n\t" \
"isb \n\t" \
"dsb \n\t" \
"ldmfd sp!, {fp, ip}" \
: : : "r0","r1","r2","r3","r4","r5","r6","r7", \
"r9","r10","lr","memory" )
"dsb" \
: : : "r0","r1","r2","r3","r4","r5","r6", \
"r9","r10","ip","lr","memory" )
void flush_uprobe_xol_access(struct page *page, unsigned long uaddr,
void *kaddr, unsigned long len);

46
arch/arm/include/asm/current.h
View File

@ -8,25 +8,18 @@
#define _ASM_ARM_CURRENT_H
#ifndef __ASSEMBLY__
#include <asm/insn.h>
struct task_struct;
static inline void set_current(struct task_struct *cur)
{
if (!IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO))
return;
extern struct task_struct *__current;
/* Set TPIDRURO */
asm("mcr p15, 0, %0, c13, c0, 3" :: "r"(cur) : "memory");
}
#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO
static inline struct task_struct *get_current(void)
static __always_inline __attribute_const__ struct task_struct *get_current(void)
{
struct task_struct *cur;
#if __has_builtin(__builtin_thread_pointer) && \
defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) && \
!(defined(CONFIG_THUMB2_KERNEL) && \
defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 130001)
/*
@ -39,16 +32,39 @@ static inline struct task_struct *get_current(void)
* https://github.com/ClangBuiltLinux/linux/issues/1485
*/
cur = __builtin_thread_pointer();
#elif defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)
asm("0: mrc p15, 0, %0, c13, c0, 3 \n\t"
#ifdef CONFIG_CPU_V6
"1: \n\t"
" .subsection 1 \n\t"
#if defined(CONFIG_ARM_HAS_GROUP_RELOCS) && \
!(defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS))
"2: " LOAD_SYM_ARMV6(%0, __current) " \n\t"
" b 1b \n\t"
#else
asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(cur));
"2: ldr %0, 3f \n\t"
" ldr %0, [%0] \n\t"
" b 1b \n\t"
"3: .long __current \n\t"
#endif
" .previous \n\t"
" .pushsection \".alt.smp.init\", \"a\" \n\t"
" .long 0b - . \n\t"
" b . + (2b - 0b) \n\t"
" .popsection \n\t"
#endif
: "=r"(cur));
#elif __LINUX_ARM_ARCH__>= 7 || \
!defined(CONFIG_ARM_HAS_GROUP_RELOCS) || \
(defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS))
cur = __current;
#else
asm(LOAD_SYM_ARMV6(%0, __current) : "=r"(cur));
#endif
return cur;
}
#define current get_current()
#else
#include <asm-generic/current.h>
#endif /* CONFIG_CURRENT_POINTER_IN_TPIDRURO */
#endif /* __ASSEMBLY__ */

3
arch/arm/include/asm/elf.h
View File

@ -61,6 +61,9 @@ typedef struct user_fp elf_fpregset_t;
#define R_ARM_MOVT_ABS 44
#define R_ARM_MOVW_PREL_NC 45
#define R_ARM_MOVT_PREL 46
#define R_ARM_ALU_PC_G0_NC 57
#define R_ARM_ALU_PC_G1_NC 59
#define R_ARM_LDR_PC_G2 63
#define R_ARM_THM_CALL 10
#define R_ARM_THM_JUMP24 30

40
arch/arm/include/asm/entry-macro-multi.S
View File

@ -1,40 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <asm/assembler.h>
/*
* Interrupt handling. Preserves r7, r8, r9
*/
.macro arch_irq_handler_default
get_irqnr_preamble r6, lr
1: get_irqnr_and_base r0, r2, r6, lr
movne r1, sp
@
@ routine called with r0 = irq number, r1 = struct pt_regs *
@
badrne lr, 1b
bne asm_do_IRQ
#ifdef CONFIG_SMP
/*
* XXX
*
* this macro assumes that irqstat (r2) and base (r6) are
* preserved from get_irqnr_and_base above
*/
ALT_SMP(test_for_ipi r0, r2, r6, lr)
ALT_UP_B(9997f)
movne r1, sp
badrne lr, 1b
bne do_IPI
#endif
9997:
.endm
.macro arch_irq_handler, symbol_name
.align 5
.global \symbol_name
\symbol_name:
mov r8, lr
arch_irq_handler_default
ret r8
.endm

4
arch/arm/include/asm/ftrace.h
View File

@ -2,6 +2,8 @@
#ifndef _ASM_ARM_FTRACE
#define _ASM_ARM_FTRACE
#define HAVE_FUNCTION_GRAPH_FP_TEST
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
#define ARCH_SUPPORTS_FTRACE_OPS 1
#endif
@ -48,7 +50,7 @@ void *return_address(unsigned int);
static inline void *return_address(unsigned int level)
{
return NULL;
return NULL;
}
#endif

131
arch/arm/include/asm/hardware/entry-macro-iomd.S
View File

@ -1,131 +0,0 @@
/*
* arch/arm/include/asm/hardware/entry-macro-iomd.S
*
* Low-level IRQ helper macros for IOC/IOMD based platforms
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
/* IOC / IOMD based hardware */
#include <asm/hardware/iomd.h>
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
ldrb \irqstat, [\base, #IOMD_IRQREQB] @ get high priority first
ldr \tmp, =irq_prio_h
teq \irqstat, #0
#ifdef IOMD_BASE
ldrbeq \irqstat, [\base, #IOMD_DMAREQ] @ get dma
addeq \tmp, \tmp, #256 @ irq_prio_h table size
teqeq \irqstat, #0
bne 2406f
#endif
ldrbeq \irqstat, [\base, #IOMD_IRQREQA] @ get low priority
addeq \tmp, \tmp, #256 @ irq_prio_d table size
teqeq \irqstat, #0
#ifdef IOMD_IRQREQC
ldrbeq \irqstat, [\base, #IOMD_IRQREQC]
addeq \tmp, \tmp, #256 @ irq_prio_l table size
teqeq \irqstat, #0
#endif
#ifdef IOMD_IRQREQD
ldrbeq \irqstat, [\base, #IOMD_IRQREQD]
addeq \tmp, \tmp, #256 @ irq_prio_lc table size
teqeq \irqstat, #0
#endif
2406: ldrbne \irqnr, [\tmp, \irqstat] @ get IRQ number
.endm
/*
* Interrupt table (incorporates priority). Please note that we
* rely on the order of these tables (see above code).
*/
.align 5
irq_prio_h: .byte 0, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10
.byte 12, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10
.byte 14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10
.byte 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10
.byte 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
.byte 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10
#ifdef IOMD_BASE
irq_prio_d: .byte 0,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 20,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
.byte 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16
#endif
irq_prio_l: .byte 0, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3
.byte 4, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3
.byte 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
.byte 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
.byte 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3
.byte 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3
.byte 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
.byte 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
.byte 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
#ifdef IOMD_IRQREQC
irq_prio_lc: .byte 24,24,25,24,26,26,26,26,27,27,27,27,27,27,27,27
.byte 28,24,25,24,26,26,26,26,27,27,27,27,27,27,27,27
.byte 29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29
.byte 29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29
.byte 30,30,30,30,30,30,30,30,27,27,27,27,27,27,27,27
.byte 30,30,30,30,30,30,30,30,27,27,27,27,27,27,27,27
.byte 29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29
.byte 29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29
.byte 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31
.byte 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31
.byte 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31
.byte 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31
.byte 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31
.byte 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31
.byte 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31
.byte 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31
#endif
#ifdef IOMD_IRQREQD
irq_prio_ld: .byte 40,40,41,40,42,42,42,42,43,43,43,43,43,43,43,43
.byte 44,40,41,40,42,42,42,42,43,43,43,43,43,43,43,43
.byte 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45
.byte 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45
.byte 46,46,46,46,46,46,46,46,43,43,43,43,43,43,43,43
.byte 46,46,46,46,46,46,46,46,43,43,43,43,43,43,43,43
.byte 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45
.byte 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45
.byte 47,47,47,47,47,47,47,47,47,47,47,47,47,47,47,47
.byte 47,47,47,47,47,47,47,47,47,47,47,47,47,47,47,47
.byte 47,47,47,47,47,47,47,47,47,47,47,47,47,47,47,47
.byte 47,47,47,47,47,47,47,47,47,47,47,47,47,47,47,47
.byte 47,47,47,47,47,47,47,47,47,47,47,47,47,47,47,47
.byte 47,47,47,47,47,47,47,47,47,47,47,47,47,47,47,47
.byte 47,47,47,47,47,47,47,47,47,47,47,47,47,47,47,47
.byte 47,47,47,47,47,47,47,47,47,47,47,47,47,47,47,47
#endif

17
arch/arm/include/asm/insn.h
View File

@ -2,6 +2,23 @@
#ifndef __ASM_ARM_INSN_H
#define __ASM_ARM_INSN_H
#include <linux/types.h>
/*
* Avoid a literal load by emitting a sequence of ADD/LDR instructions with the
* appropriate relocations. The combined sequence has a range of -/+ 256 MiB,
* which should be sufficient for the core kernel as well as modules loaded
* into the module region. (Not supported by LLD before release 14)
*/
#define LOAD_SYM_ARMV6(reg, sym) \
" .globl " #sym " \n\t" \
" .reloc 10f, R_ARM_ALU_PC_G0_NC, " #sym " \n\t" \
" .reloc 11f, R_ARM_ALU_PC_G1_NC, " #sym " \n\t" \
" .reloc 12f, R_ARM_LDR_PC_G2, " #sym " \n\t" \
"10: sub " #reg ", pc, #8 \n\t" \
"11: sub " #reg ", " #reg ", #4 \n\t" \
"12: ldr " #reg ", [" #reg ", #0] \n\t"
static inline unsigned long
arm_gen_nop(void)
{

1
arch/arm/include/asm/irq.h
View File

@ -26,7 +26,6 @@
struct irqaction;
struct pt_regs;
extern void asm_do_IRQ(unsigned int, struct pt_regs *);
void handle_IRQ(unsigned int, struct pt_regs *);
void init_IRQ(void);

2
arch/arm/include/asm/mach/arch.h
View File

@ -56,9 +56,7 @@ struct machine_desc {
void (*init_time)(void);
void (*init_machine)(void);
void (*init_late)(void);
#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
void (*handle_irq)(struct pt_regs *);
#endif
void (*restart)(enum reboot_mode, const char *);
};

2
arch/arm/include/asm/mmu.h
View File

@ -10,7 +10,7 @@ typedef struct {
#else
int switch_pending;
#endif
unsigned int vmalloc_seq;
atomic_t vmalloc_seq;
unsigned long sigpage;
#ifdef CONFIG_VDSO
unsigned long vdso;

22
arch/arm/include/asm/mmu_context.h
View File

@ -23,6 +23,16 @@
void __check_vmalloc_seq(struct mm_struct *mm);
#ifdef CONFIG_MMU
static inline void check_vmalloc_seq(struct mm_struct *mm)
{
if (!IS_ENABLED(CONFIG_ARM_LPAE) &&
unlikely(atomic_read(&mm->context.vmalloc_seq) !=
atomic_read(&init_mm.context.vmalloc_seq)))
__check_vmalloc_seq(mm);
}
#endif
#ifdef CONFIG_CPU_HAS_ASID
void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk);
@ -52,8 +62,7 @@ static inline void a15_erratum_get_cpumask(int this_cpu, struct mm_struct *mm,
static inline void check_and_switch_context(struct mm_struct *mm,
struct task_struct *tsk)
{
if (unlikely(mm->context.vmalloc_seq != init_mm.context.vmalloc_seq))
__check_vmalloc_seq(mm);
check_vmalloc_seq(mm);
if (irqs_disabled())
/*
@ -129,6 +138,15 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
#endif
}
#ifdef CONFIG_VMAP_STACK
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
if (mm != &init_mm)
check_vmalloc_seq(mm);
}
#define enter_lazy_tlb enter_lazy_tlb
#endif
#include <asm-generic/mmu_context.h>
#endif

3
arch/arm/include/asm/page.h
View File

@ -147,6 +147,9 @@ extern void copy_page(void *to, const void *from);
#include <asm/pgtable-3level-types.h>
#else
#include <asm/pgtable-2level-types.h>
#ifdef CONFIG_VMAP_STACK
#define ARCH_PAGE_TABLE_SYNC_MASK PGTBL_PMD_MODIFIED
#endif
#endif
#endif /* CONFIG_MMU */

35
arch/arm/include/asm/percpu.h
View File

@ -5,20 +5,27 @@
#ifndef _ASM_ARM_PERCPU_H_
#define _ASM_ARM_PERCPU_H_
#include <asm/insn.h>
register unsigned long current_stack_pointer asm ("sp");
/*
* Same as asm-generic/percpu.h, except that we store the per cpu offset
* in the TPIDRPRW. TPIDRPRW only exists on V6K and V7
*/
#if defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)
#ifdef CONFIG_SMP
static inline void set_my_cpu_offset(unsigned long off)
{
extern unsigned int smp_on_up;
if (IS_ENABLED(CONFIG_CPU_V6) && !smp_on_up)
return;
/* Set TPIDRPRW */
asm volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (off) : "memory");
}
static inline unsigned long __my_cpu_offset(void)
static __always_inline unsigned long __my_cpu_offset(void)
{
unsigned long off;
@ -27,8 +34,28 @@ static inline unsigned long __my_cpu_offset(void)
* We want to allow caching the value, so avoid using volatile and
* instead use a fake stack read to hazard against barrier().
*/
asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off)
: "Q" (*(const unsigned long *)current_stack_pointer));
asm("0: mrc p15, 0, %0, c13, c0, 4 \n\t"
#ifdef CONFIG_CPU_V6
"1: \n\t"
" .subsection 1 \n\t"
#if defined(CONFIG_ARM_HAS_GROUP_RELOCS) && \
!(defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS))
"2: " LOAD_SYM_ARMV6(%0, __per_cpu_offset) " \n\t"
" b 1b \n\t"
#else
"2: ldr %0, 3f \n\t"
" ldr %0, [%0] \n\t"
" b 1b \n\t"
"3: .long __per_cpu_offset \n\t"
#endif
" .previous \n\t"
" .pushsection \".alt.smp.init\", \"a\" \n\t"
" .long 0b - . \n\t"
" b . + (2b - 0b) \n\t"
" .popsection \n\t"
#endif
: "=r" (off)
: "Q" (*(const unsigned long *)current_stack_pointer));
return off;
}

5
arch/arm/include/asm/smp.h
View File

@ -24,11 +24,6 @@ struct seq_file;
*/
extern void show_ipi_list(struct seq_file *, int);
/*
* Called from assembly code, this handles an IPI.
*/
asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
/*
* Called from C code, this handles an IPI.
*/

5
arch/arm/include/asm/stacktrace.h
View File

@ -14,6 +14,9 @@ struct stackframe {
unsigned long sp;
unsigned long lr;
unsigned long pc;
/* address of the LR value on the stack */
unsigned long *lr_addr;
#ifdef CONFIG_KRETPROBES
struct llist_node *kr_cur;
struct task_struct *tsk;
@ -36,5 +39,7 @@ void arm_get_current_stackframe(struct pt_regs *regs, struct stackframe *frame)
extern int unwind_frame(struct stackframe *frame);
extern void walk_stackframe(struct stackframe *frame,
int (*fn)(struct stackframe *, void *), void *data);
extern void dump_mem(const char *lvl, const char *str, unsigned long bottom,
unsigned long top);
#endif /* __ASM_STACKTRACE_H */

3
arch/arm/include/asm/switch_to.h
View File

@ -3,6 +3,7 @@
#define __ASM_ARM_SWITCH_TO_H
#include <linux/thread_info.h>
#include <asm/smp_plat.h>
/*
* For v7 SMP cores running a preemptible kernel we may be pre-empted
@ -26,7 +27,7 @@ extern struct task_struct *__switch_to(struct task_struct *, struct thread_info
#define switch_to(prev,next,last) \
do { \
__complete_pending_tlbi(); \
if (IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO)) \
if (IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || is_smp()) \
__this_cpu_write(__entry_task, next); \
last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
} while (0)

35
arch/arm/include/asm/thread_info.h
View File

@ -25,6 +25,14 @@
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_START_SP (THREAD_SIZE - 8)
#ifdef CONFIG_VMAP_STACK
#define THREAD_ALIGN (2 * THREAD_SIZE)
#else
#define THREAD_ALIGN THREAD_SIZE
#endif
#define OVERFLOW_STACK_SIZE SZ_4K
#ifndef __ASSEMBLY__
struct task_struct;
@ -54,9 +62,6 @@ struct cpu_context_save {
struct thread_info {
unsigned long flags; /* low level flags */
int preempt_count; /* 0 => preemptable, <0 => bug */
#ifndef CONFIG_THREAD_INFO_IN_TASK
struct task_struct *task; /* main task structure */
#endif
__u32 cpu; /* cpu */
__u32 cpu_domain; /* cpu domain */
struct cpu_context_save cpu_context; /* cpu context */
@ -72,39 +77,15 @@ struct thread_info {
#define INIT_THREAD_INFO(tsk) \
{ \
INIT_THREAD_INFO_TASK(tsk) \
.flags = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
}
#ifdef CONFIG_THREAD_INFO_IN_TASK
#define INIT_THREAD_INFO_TASK(tsk)
static inline struct task_struct *thread_task(struct thread_info* ti)
{
return (struct task_struct *)ti;
}
#else
#define INIT_THREAD_INFO_TASK(tsk) .task = &(tsk),
static inline struct task_struct *thread_task(struct thread_info* ti)
{
return ti->task;
}
/*
* how to get the thread information struct from C
*/
static inline struct thread_info *current_thread_info(void) __attribute_const__;
static inline struct thread_info *current_thread_info(void)
{
return (struct thread_info *)
(current_stack_pointer & ~(THREAD_SIZE - 1));
}
#endif
#define thread_saved_pc(tsk) \
((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
#define thread_saved_sp(tsk) \

31
arch/arm/include/asm/tls.h
View File

@ -18,21 +18,32 @@
.endm
.macro switch_tls_v6, base, tp, tpuser, tmp1, tmp2
ldr \tmp1, =elf_hwcap
ldr \tmp1, [\tmp1, #0]
#ifdef CONFIG_SMP
ALT_SMP(nop)
ALT_UP_B(.L0_\@)
.subsection 1
#endif
.L0_\@:
ldr_va \tmp1, elf_hwcap
mov \tmp2, #0xffff0fff
tst \tmp1, #HWCAP_TLS @ hardware TLS available?
streq \tp, [\tmp2, #-15] @ set TLS value at 0xffff0ff0
mrcne p15, 0, \tmp2, c13, c0, 2 @ get the user r/w register
mcrne p15, 0, \tp, c13, c0, 3 @ yes, set TLS register
mcrne p15, 0, \tpuser, c13, c0, 2 @ set user r/w register
strne \tmp2, [\base, #TI_TP_VALUE + 4] @ save it
beq .L2_\@
mcr p15, 0, \tp, c13, c0, 3 @ yes, set TLS register
#ifdef CONFIG_SMP
b .L1_\@
.previous
#endif
.L1_\@: switch_tls_v6k \base, \tp, \tpuser, \tmp1, \tmp2
.L2_\@:
.endm
.macro switch_tls_software, base, tp, tpuser, tmp1, tmp2
mov \tmp1, #0xffff0fff
str \tp, [\tmp1, #-15] @ set TLS value at 0xffff0ff0
.endm
#else
#include <asm/smp_plat.h>
#endif
#ifdef CONFIG_TLS_REG_EMUL
@ -43,7 +54,7 @@
#elif defined(CONFIG_CPU_V6)
#define tls_emu 0
#define has_tls_reg (elf_hwcap & HWCAP_TLS)
#define defer_tls_reg_update 0
#define defer_tls_reg_update is_smp()
#define switch_tls switch_tls_v6
#elif defined(CONFIG_CPU_32v6K)
#define tls_emu 0
@ -81,11 +92,11 @@ static inline void set_tls(unsigned long val)
*/
barrier();
if (!tls_emu && !defer_tls_reg_update) {
if (has_tls_reg) {
if (!tls_emu) {
if (has_tls_reg && !defer_tls_reg_update) {
asm("mcr p15, 0, %0, c13, c0, 3"
: : "r" (val));
} else {
} else if (!has_tls_reg) {
#ifdef CONFIG_KUSER_HELPERS
/*
* User space must never try to access this

3
arch/arm/include/asm/v7m.h
View File

@ -13,6 +13,7 @@
#define V7M_SCB_ICSR_PENDSVSET (1 << 28)
#define V7M_SCB_ICSR_PENDSVCLR (1 << 27)
#define V7M_SCB_ICSR_RETTOBASE (1 << 11)
#define V7M_SCB_ICSR_VECTACTIVE 0x000001ff
#define V7M_SCB_VTOR 0x08
@ -38,7 +39,7 @@
#define V7M_SCB_SHCSR_MEMFAULTENA (1 << 16)
#define V7M_xPSR_FRAMEPTRALIGN 0x00000200
#define V7M_xPSR_EXCEPTIONNO 0x000001ff
#define V7M_xPSR_EXCEPTIONNO V7M_SCB_ICSR_VECTACTIVE
/*
* When branching to an address that has bits [31:28] == 0xf an exception return

1
arch/arm/kernel/Makefile
View File

@ -10,6 +10,7 @@ ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_ftrace.o = -pg
CFLAGS_REMOVE_insn.o = -pg
CFLAGS_REMOVE_patch.o = -pg
CFLAGS_REMOVE_unwind.o = -pg
endif
CFLAGS_REMOVE_return_address.o = -pg

3
arch/arm/kernel/asm-offsets.c
View File

@ -43,9 +43,6 @@ int main(void)
BLANK();
DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
#ifndef CONFIG_THREAD_INFO_IN_TASK
DEFINE(TI_TASK, offsetof(struct thread_info, task));
#endif
DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
DEFINE(TI_CPU_DOMAIN, offsetof(struct thread_info, cpu_domain));
DEFINE(TI_CPU_SAVE, offsetof(struct thread_info, cpu_context));

183
arch/arm/kernel/entry-armv.S
View File

@ -19,9 +19,6 @@
#include <asm/glue-df.h>
#include <asm/glue-pf.h>
#include <asm/vfpmacros.h>
#ifndef CONFIG_GENERIC_IRQ_MULTI_HANDLER
#include <mach/entry-macro.S>
#endif
#include <asm/thread_notify.h>
#include <asm/unwind.h>
#include <asm/unistd.h>
@ -30,19 +27,35 @@
#include <asm/uaccess-asm.h>
#include "entry-header.S"
#include <asm/entry-macro-multi.S>
#include <asm/probes.h>
/*
* Interrupt handling.
*/
.macro irq_handler
#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
mov r0, sp
bl generic_handle_arch_irq
#else
arch_irq_handler_default
.macro irq_handler, from_user:req
mov r1, sp
ldr_this_cpu r2, irq_stack_ptr, r2, r3
.if \from_user == 0
@
@ If we took the interrupt while running in the kernel, we may already
@ be using the IRQ stack, so revert to the original value in that case.
@
subs r3, r2, r1 @ SP above bottom of IRQ stack?
rsbscs r3, r3, #THREAD_SIZE @ ... and below the top?
#ifdef CONFIG_VMAP_STACK
ldr_va r3, high_memory, cc @ End of the linear region
cmpcc r3, r1 @ Stack pointer was below it?
#endif
bcc 0f @ If not, switch to the IRQ stack
mov r0, r1
bl generic_handle_arch_irq
b 1f
0:
.endif
mov_l r0, generic_handle_arch_irq
bl call_with_stack
1:
.endm
.macro pabt_helper
@ -140,27 +153,35 @@ ENDPROC(__und_invalid)
#define SPFIX(code...)
#endif
.macro svc_entry, stack_hole=0, trace=1, uaccess=1
.macro svc_entry, stack_hole=0, trace=1, uaccess=1, overflow_check=1
UNWIND(.fnstart )
UNWIND(.save {r0 - pc} )
sub sp, sp, #(SVC_REGS_SIZE + \stack_hole - 4)
sub sp, sp, #(SVC_REGS_SIZE + \stack_hole)
THUMB( add sp, r1 ) @ get SP in a GPR without
THUMB( sub r1, sp, r1 ) @ using a temp register
.if \overflow_check
UNWIND(.save {r0 - pc} )
do_overflow_check (SVC_REGS_SIZE + \stack_hole)
.endif
#ifdef CONFIG_THUMB2_KERNEL
SPFIX( str r0, [sp] ) @ temporarily saved
SPFIX( mov r0, sp )
SPFIX( tst r0, #4 ) @ test original stack alignment
SPFIX( ldr r0, [sp] ) @ restored
tst r1, #4 @ test stack pointer alignment
sub r1, sp, r1 @ restore original R1
sub sp, r1 @ restore original SP
#else
SPFIX( tst sp, #4 )
#endif
SPFIX( subeq sp, sp, #4 )
stmia sp, {r1 - r12}
SPFIX( subne sp, sp, #4 )
ARM( stmib sp, {r1 - r12} )
THUMB( stmia sp, {r0 - r12} ) @ No STMIB in Thumb-2
ldmia r0, {r3 - r5}
add r7, sp, #S_SP - 4 @ here for interlock avoidance
add r7, sp, #S_SP @ here for interlock avoidance
mov r6, #-1 @ "" "" "" ""
add r2, sp, #(SVC_REGS_SIZE + \stack_hole - 4)
SPFIX( addeq r2, r2, #4 )
str r3, [sp, #-4]! @ save the "real" r0 copied
add r2, sp, #(SVC_REGS_SIZE + \stack_hole)
SPFIX( addne r2, r2, #4 )
str r3, [sp] @ save the "real" r0 copied
@ from the exception stack
mov r3, lr
@ -199,7 +220,7 @@ ENDPROC(__dabt_svc)
.align 5
__irq_svc:
svc_entry
irq_handler
irq_handler from_user=0
#ifdef CONFIG_PREEMPTION
ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
@ -426,7 +447,7 @@ ENDPROC(__dabt_usr)
__irq_usr:
usr_entry
kuser_cmpxchg_check
irq_handler
irq_handler from_user=1
get_thread_info tsk
mov why, #0
b ret_to_user_from_irq
@ -752,16 +773,17 @@ ENTRY(__switch_to)
ldr r6, [r2, #TI_CPU_DOMAIN]
#endif
switch_tls r1, r4, r5, r3, r7
#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
ldr r7, [r2, #TI_TASK]
#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP) && \
!defined(CONFIG_STACKPROTECTOR_PER_TASK)
ldr r8, =__stack_chk_guard
.if (TSK_STACK_CANARY > IMM12_MASK)
add r7, r7, #TSK_STACK_CANARY & ~IMM12_MASK
add r9, r2, #TSK_STACK_CANARY & ~IMM12_MASK
ldr r9, [r9, #TSK_STACK_CANARY & IMM12_MASK]
.else
ldr r9, [r2, #TSK_STACK_CANARY & IMM12_MASK]
.endif
ldr r7, [r7, #TSK_STACK_CANARY & IMM12_MASK]
#elif defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO)
mov r7, r2 @ Preserve 'next'
#endif
mov r7, r2 @ Preserve 'next'
#ifdef CONFIG_CPU_USE_DOMAINS
mcr p15, 0, r6, c3, c0, 0 @ Set domain register
#endif
@ -770,19 +792,102 @@ ENTRY(__switch_to)
ldr r0, =thread_notify_head
mov r1, #THREAD_NOTIFY_SWITCH
bl atomic_notifier_call_chain
#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
str r7, [r8]
#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP) && \
!defined(CONFIG_STACKPROTECTOR_PER_TASK)
str r9, [r8]
#endif
THUMB( mov ip, r4 )
mov r0, r5
set_current r7
ARM( ldmia r4, {r4 - sl, fp, sp, pc} ) @ Load all regs saved previously
THUMB( ldmia ip!, {r4 - sl, fp} ) @ Load all regs saved previously
THUMB( ldr sp, [ip], #4 )
THUMB( ldr pc, [ip] )
#if !defined(CONFIG_THUMB2_KERNEL) && !defined(CONFIG_VMAP_STACK)
set_current r7, r8
ldmia r4, {r4 - sl, fp, sp, pc} @ Load all regs saved previously
#else
mov r1, r7
ldmia r4, {r4 - sl, fp, ip, lr} @ Load all regs saved previously
#ifdef CONFIG_VMAP_STACK
@
@ Do a dummy read from the new stack while running from the old one so
@ that we can rely on do_translation_fault() to fix up any stale PMD
@ entries covering the vmalloc region.
@
ldr r2, [ip]
#endif
@ When CONFIG_THREAD_INFO_IN_TASK=n, the update of SP itself is what
@ effectuates the task switch, as that is what causes the observable
@ values of current and current_thread_info to change. When
@ CONFIG_THREAD_INFO_IN_TASK=y, setting current (and therefore
@ current_thread_info) is done explicitly, and the update of SP just
@ switches us to another stack, with few other side effects. In order
@ to prevent this distinction from causing any inconsistencies, let's
@ keep the 'set_current' call as close as we can to the update of SP.
set_current r1, r2
mov sp, ip
ret lr
#endif
UNWIND(.fnend )
ENDPROC(__switch_to)
#ifdef CONFIG_VMAP_STACK
.text
.align 2
__bad_stack:
@
@ We've just detected an overflow. We need to load the address of this
@ CPU's overflow stack into the stack pointer register. We have only one
@ scratch register so let's use a sequence of ADDs including one
@ involving the PC, and decorate them with PC-relative group
@ relocations. As these are ARM only, switch to ARM mode first.
@
@ We enter here with IP clobbered and its value stashed on the mode
@ stack.
@
THUMB( bx pc )
THUMB( nop )
THUMB( .arm )
ldr_this_cpu_armv6 ip, overflow_stack_ptr
str sp, [ip, #-4]! @ Preserve original SP value
mov sp, ip @ Switch to overflow stack
pop {ip} @ Original SP in IP
#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)
mov ip, ip @ mov expected by unwinder
push {fp, ip, lr, pc} @ GCC flavor frame record
#else
str ip, [sp, #-8]! @ store original SP
push {fpreg, lr} @ Clang flavor frame record
#endif
UNWIND( ldr ip, [r0, #4] ) @ load exception LR
UNWIND( str ip, [sp, #12] ) @ store in the frame record
ldr ip, [r0, #12] @ reload IP
@ Store the original GPRs to the new stack.
svc_entry uaccess=0, overflow_check=0
UNWIND( .save {sp, pc} )
UNWIND( .save {fpreg, lr} )
UNWIND( .setfp fpreg, sp )
ldr fpreg, [sp, #S_SP] @ Add our frame record
@ to the linked list
#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)
ldr r1, [fp, #4] @ reload SP at entry
add fp, fp, #12
#else
ldr r1, [fpreg, #8]
#endif
str r1, [sp, #S_SP] @ store in pt_regs
@ Stash the regs for handle_bad_stack
mov r0, sp
@ Time to die
bl handle_bad_stack
nop
UNWIND( .fnend )
ENDPROC(__bad_stack)
#endif
__INIT
/*

16
arch/arm/kernel/entry-common.S
View File

@ -16,12 +16,14 @@
.equ NR_syscalls, __NR_syscalls
#ifdef CONFIG_NEED_RET_TO_USER
#include <mach/entry-macro.S>
#else
.macro arch_ret_to_user, tmp1, tmp2
.endm
.macro arch_ret_to_user, tmp
#ifdef CONFIG_ARCH_IOP32X
mrc p15, 0, \tmp, c15, c1, 0
tst \tmp, #(1 << 6)
bicne \tmp, \tmp, #(1 << 6)
mcrne p15, 0, \tmp, c15, c1, 0 @ Disable cp6 access
#endif
.endm
#include "entry-header.S"
@ -55,7 +57,7 @@ __ret_fast_syscall:
/* perform architecture specific actions before user return */
arch_ret_to_user r1, lr
arch_ret_to_user r1
restore_user_regs fast = 1, offset = S_OFF
UNWIND(.fnend )
@ -128,7 +130,7 @@ no_work_pending:
asm_trace_hardirqs_on save = 0
/* perform architecture specific actions before user return */
arch_ret_to_user r1, lr
arch_ret_to_user r1
ct_user_enter save = 0
restore_user_regs fast = 0, offset = 0

128
arch/arm/kernel/entry-ftrace.S
View File

@ -22,12 +22,9 @@
* mcount can be thought of as a function called in the middle of a subroutine
* call. As such, it needs to be transparent for both the caller and the
* callee: the original lr needs to be restored when leaving mcount, and no
* registers should be clobbered. (In the __gnu_mcount_nc implementation, we
* clobber the ip register. This is OK because the ARM calling convention
* allows it to be clobbered in subroutines and doesn't use it to hold
* parameters.)
* registers should be clobbered.
*
* When using dynamic ftrace, we patch out the mcount call by a "pop {lr}"
* When using dynamic ftrace, we patch out the mcount call by a "add sp, #4"
* instead of the __gnu_mcount_nc call (see arch/arm/kernel/ftrace.c).
*/
@ -38,23 +35,20 @@
.macro __mcount suffix
mcount_enter
ldr r0, =ftrace_trace_function
ldr r2, [r0]
adr r0, .Lftrace_stub
ldr_va r2, ftrace_trace_function
badr r0, .Lftrace_stub
cmp r0, r2
bne 1f
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
ldr r1, =ftrace_graph_return
ldr r2, [r1]
cmp r0, r2
bne ftrace_graph_caller\suffix
ldr_va r2, ftrace_graph_return
cmp r0, r2
bne ftrace_graph_caller\suffix
ldr r1, =ftrace_graph_entry
ldr r2, [r1]
ldr r0, =ftrace_graph_entry_stub
cmp r0, r2
bne ftrace_graph_caller\suffix
ldr_va r2, ftrace_graph_entry
mov_l r0, ftrace_graph_entry_stub
cmp r0, r2
bne ftrace_graph_caller\suffix
#endif
mcount_exit
@ -70,29 +64,27 @@
.macro __ftrace_regs_caller
sub sp, sp, #8 @ space for PC and CPSR OLD_R0,
str lr, [sp, #-8]! @ store LR as PC and make space for CPSR/OLD_R0,
@ OLD_R0 will overwrite previous LR
add ip, sp, #12 @ move in IP the value of SP as it was
@ before the push {lr} of the mcount mechanism
str lr, [sp, #0] @ store LR instead of PC
ldr lr, [sp, #8] @ get previous LR
ldr lr, [sp, #8] @ get previous LR
str r0, [sp, #8] @ write r0 as OLD_R0 over previous LR
stmdb sp!, {ip, lr}
stmdb sp!, {r0-r11, lr}
str lr, [sp, #-4]! @ store previous LR as LR
add lr, sp, #16 @ move in LR the value of SP as it was
@ before the push {lr} of the mcount mechanism
push {r0-r11, ip, lr}
@ stack content at this point:
@ 0 4 48 52 56 60 64 68 72
@ R0 | R1 | ... | LR | SP + 4 | previous LR | LR | PSR | OLD_R0 |
@ R0 | R1 | ... | IP | SP + 4 | previous LR | LR | PSR | OLD_R0 |
mov r3, sp @ struct pt_regs*
mov r3, sp @ struct pt_regs*
ldr r2, =function_trace_op
ldr r2, [r2] @ pointer to the current
ldr_va r2, function_trace_op @ pointer to the current
@ function tracing op
ldr r1, [sp, #S_LR] @ lr of instrumented func
@ -108,35 +100,37 @@ ftrace_regs_call:
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.globl ftrace_graph_regs_call
ftrace_graph_regs_call:
mov r0, r0
ARM( mov r0, r0 )
THUMB( nop.w )
#endif
@ pop saved regs
ldmia sp!, {r0-r12} @ restore r0 through r12
ldr ip, [sp, #8] @ restore PC
ldr lr, [sp, #4] @ restore LR
ldr sp, [sp, #0] @ restore SP
mov pc, ip @ return
pop {r0-r11, ip, lr} @ restore r0 through r12
ldr lr, [sp], #4 @ restore LR
ldr pc, [sp], #12
.endm
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.macro __ftrace_graph_regs_caller
sub r0, fp, #4 @ lr of instrumented routine (parent)
#ifdef CONFIG_UNWINDER_FRAME_POINTER
sub r0, fp, #4 @ lr of instrumented routine (parent)
#else
add r0, sp, #S_LR
#endif
@ called from __ftrace_regs_caller
ldr r1, [sp, #S_PC] @ instrumented routine (func)
ldr r1, [sp, #S_PC] @ instrumented routine (func)
mcount_adjust_addr r1, r1
mov r2, fp @ frame pointer
mov r2, fpreg @ frame pointer
add r3, sp, #PT_REGS_SIZE
bl prepare_ftrace_return
@ pop registers saved in ftrace_regs_caller
ldmia sp!, {r0-r12} @ restore r0 through r12
ldr ip, [sp, #8] @ restore PC
ldr lr, [sp, #4] @ restore LR
ldr sp, [sp, #0] @ restore SP
mov pc, ip @ return
pop {r0-r11, ip, lr} @ restore r0 through r12
ldr lr, [sp], #4 @ restore LR
ldr pc, [sp], #12
.endm
#endif
@ -149,8 +143,7 @@ ftrace_graph_regs_call:
mcount_adjust_addr r0, lr @ instrumented function
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
ldr r2, =function_trace_op
ldr r2, [r2] @ pointer to the current
ldr_va r2, function_trace_op @ pointer to the current
@ function tracing op
mov r3, #0 @ regs is NULL
#endif
@ -162,14 +155,19 @@ ftrace_call\suffix:
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.globl ftrace_graph_call\suffix
ftrace_graph_call\suffix:
mov r0, r0
ARM( mov r0, r0 )
THUMB( nop.w )
#endif
mcount_exit
.endm
.macro __ftrace_graph_caller
#ifdef CONFIG_UNWINDER_FRAME_POINTER
sub r0, fp, #4 @ &lr of instrumented routine (&parent)
#else
add r0, sp, #20
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
@ called from __ftrace_caller, saved in mcount_enter
ldr r1, [sp, #16] @ instrumented routine (func)
@ -178,7 +176,8 @@ ftrace_graph_call\suffix:
@ called from __mcount, untouched in lr
mcount_adjust_addr r1, lr @ instrumented routine (func)
#endif
mov r2, fp @ frame pointer
mov r2, fpreg @ frame pointer
add r3, sp, #24
bl prepare_ftrace_return
mcount_exit
.endm
@ -202,16 +201,17 @@ ftrace_graph_call\suffix:
.endm
.macro mcount_exit
ldmia sp!, {r0-r3, ip, lr}
ret ip
ldmia sp!, {r0-r3}
ldr lr, [sp, #4]
ldr pc, [sp], #8
.endm
ENTRY(__gnu_mcount_nc)
UNWIND(.fnstart)
#ifdef CONFIG_DYNAMIC_FTRACE
mov ip, lr
ldmia sp!, {lr}
ret ip
push {lr}
ldr lr, [sp, #4]
ldr pc, [sp], #8
#else
__mcount
#endif
@ -256,17 +256,33 @@ ENDPROC(ftrace_graph_regs_caller)
.purgem mcount_exit
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.globl return_to_handler
return_to_handler:
ENTRY(return_to_handler)
stmdb sp!, {r0-r3}
mov r0, fp @ frame pointer
add r0, sp, #16 @ sp at exit of instrumented routine
bl ftrace_return_to_handler
mov lr, r0 @ r0 has real ret addr
ldmia sp!, {r0-r3}
ret lr
ENDPROC(return_to_handler)
#endif
ENTRY(ftrace_stub)
.Lftrace_stub:
ret lr
ENDPROC(ftrace_stub)
#ifdef CONFIG_DYNAMIC_FTRACE
__INIT
.macro init_tramp, dst:req
ENTRY(\dst\()_from_init)
ldr pc, =\dst
ENDPROC(\dst\()_from_init)
.endm
init_tramp ftrace_caller
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
init_tramp ftrace_regs_caller
#endif
#endif

47
arch/arm/kernel/entry-header.S
View File

@ -292,12 +292,18 @@
.macro restore_user_regs, fast = 0, offset = 0
#if defined(CONFIG_CPU_32v6K) && !defined(CONFIG_CPU_V6)
#if defined(CONFIG_CPU_32v6K) && \
(!defined(CONFIG_CPU_V6) || defined(CONFIG_SMP))
#ifdef CONFIG_CPU_V6
ALT_SMP(nop)
ALT_UP_B(.L1_\@)
#endif
@ The TLS register update is deferred until return to user space so we
@ can use it for other things while running in the kernel
get_thread_info r1
mrc p15, 0, r1, c13, c0, 3 @ get current_thread_info pointer
ldr r1, [r1, #TI_TP_VALUE]
mcr p15, 0, r1, c13, c0, 3 @ set TLS register
.L1_\@:
#endif
uaccess_enable r1, isb=0
@ -423,3 +429,40 @@ scno .req r7 @ syscall number
tbl .req r8 @ syscall table pointer
why .req r8 @ Linux syscall (!= 0)
tsk .req r9 @ current thread_info
.macro do_overflow_check, frame_size:req
#ifdef CONFIG_VMAP_STACK
@
@ Test whether the SP has overflowed. Task and IRQ stacks are aligned
@ so that SP & BIT(THREAD_SIZE_ORDER + PAGE_SHIFT) should always be
@ zero.
@
ARM( tst sp, #1 << (THREAD_SIZE_ORDER + PAGE_SHIFT) )
THUMB( tst r1, #1 << (THREAD_SIZE_ORDER + PAGE_SHIFT) )
THUMB( it ne )
bne .Lstack_overflow_check\@
.pushsection .text
.Lstack_overflow_check\@:
@
@ The stack pointer is not pointing to a valid vmap'ed stack, but it
@ may be pointing into the linear map instead, which may happen if we
@ are already running from the overflow stack. We cannot detect overflow
@ in such cases so just carry on.
@
str ip, [r0, #12] @ Stash IP on the mode stack
ldr_va ip, high_memory @ Start of VMALLOC space
ARM( cmp sp, ip ) @ SP in vmalloc space?
THUMB( cmp r1, ip )
THUMB( itt lo )
ldrlo ip, [r0, #12] @ Restore IP
blo .Lout\@ @ Carry on
THUMB( sub r1, sp, r1 ) @ Restore original R1
THUMB( sub sp, r1 ) @ Restore original SP
add sp, sp, #\frame_size @ Undo svc_entry's SP change
b __bad_stack @ Handle VMAP stack overflow
.popsection
.Lout\@:
#endif
.endm

37
arch/arm/kernel/entry-v7m.S
View File

@ -39,16 +39,25 @@ __irq_entry:
@
@ Invoke the IRQ handler
@
mrs r0, ipsr
ldr r1, =V7M_xPSR_EXCEPTIONNO
and r0, r1
sub r0, #16
mov r1, sp
stmdb sp!, {lr}
@ routine called with r0 = irq number, r1 = struct pt_regs *
bl nvic_handle_irq
mov r0, sp
ldr_this_cpu sp, irq_stack_ptr, r1, r2
@
@ If we took the interrupt while running in the kernel, we may already
@ be using the IRQ stack, so revert to the original value in that case.
@
subs r2, sp, r0 @ SP above bottom of IRQ stack?
rsbscs r2, r2, #THREAD_SIZE @ ... and below the top?
movcs sp, r0
push {r0, lr} @ preserve LR and original SP
@ routine called with r0 = struct pt_regs *
bl generic_handle_arch_irq
pop {r0, lr}
mov sp, r0
pop {lr}
@
@ Check for any pending work if returning to user
@
@ -101,15 +110,17 @@ ENTRY(__switch_to)
str sp, [ip], #4
str lr, [ip], #4
mov r5, r0
mov r6, r2 @ Preserve 'next'
add r4, r2, #TI_CPU_SAVE
ldr r0, =thread_notify_head
mov r1, #THREAD_NOTIFY_SWITCH
bl atomic_notifier_call_chain
mov ip, r4
mov r0, r5
ldmia ip!, {r4 - r11} @ Load all regs saved previously
ldr sp, [ip]
ldr pc, [ip, #4]!
mov r1, r6
ldmia r4, {r4 - r12, lr} @ Load all regs saved previously
set_current r1, r2
mov sp, ip
bx lr
.fnend
ENDPROC(__switch_to)

62
arch/arm/kernel/ftrace.c
View File

@ -22,12 +22,24 @@
#include <asm/ftrace.h>
#include <asm/insn.h>
#include <asm/set_memory.h>
#include <asm/stacktrace.h>
#include <asm/patch.h>
/*
* The compiler emitted profiling hook consists of
*
* PUSH {LR}
* BL __gnu_mcount_nc
*
* To turn this combined sequence into a NOP, we need to restore the value of
* SP before the PUSH. Let's use an ADD rather than a POP into LR, as LR is not
* modified anyway, and reloading LR from memory is highly likely to be less
* efficient.
*/
#ifdef CONFIG_THUMB2_KERNEL
#define NOP 0xf85deb04 /* pop.w {lr} */
#define NOP 0xf10d0d04 /* add.w sp, sp, #4 */
#else
#define NOP 0xe8bd4000 /* pop {lr} */
#define NOP 0xe28dd004 /* add sp, sp, #4 */
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
@ -51,9 +63,20 @@ static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec)
return NOP;
}
static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr)
void ftrace_caller_from_init(void);
void ftrace_regs_caller_from_init(void);
static unsigned long __ref adjust_address(struct dyn_ftrace *rec,
unsigned long addr)
{
return addr;
if (!IS_ENABLED(CONFIG_DYNAMIC_FTRACE) ||
system_state >= SYSTEM_FREEING_INITMEM ||
likely(!is_kernel_inittext(rec->ip)))
return addr;
if (!IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS) ||
addr == (unsigned long)&ftrace_caller)
return (unsigned long)&ftrace_caller_from_init;
return (unsigned long)&ftrace_regs_caller_from_init;
}
int ftrace_arch_code_modify_prepare(void)
@ -189,15 +212,23 @@ int ftrace_make_nop(struct module *mod,
#endif
new = ftrace_nop_replace(rec);
ret = ftrace_modify_code(ip, old, new, true);
/*
* Locations in .init.text may call __gnu_mcount_mc via a linker
* emitted veneer if they are too far away from its implementation, and
* so validation may fail spuriously in such cases. Let's work around
* this by omitting those from validation.
*/
ret = ftrace_modify_code(ip, old, new, !is_kernel_inittext(ip));
return ret;
}
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
asmlinkage
void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
unsigned long frame_pointer)
unsigned long frame_pointer,
unsigned long stack_pointer)
{
unsigned long return_hooker = (unsigned long) &return_to_handler;
unsigned long old;
@ -205,6 +236,23 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
if (unlikely(atomic_read(&current->tracing_graph_pause)))
return;
if (IS_ENABLED(CONFIG_UNWINDER_FRAME_POINTER)) {
/* FP points one word below parent's top of stack */
frame_pointer += 4;
} else {
struct stackframe frame = {
.fp = frame_pointer,
.sp = stack_pointer,
.lr = self_addr,
.pc = self_addr,
};
if (unwind_frame(&frame) < 0)
return;
if (frame.lr != self_addr)
parent = frame.lr_addr;
frame_pointer = frame.sp;
}
old = *parent;
*parent = return_hooker;
@ -225,7 +273,7 @@ static int __ftrace_modify_caller(unsigned long *callsite,
unsigned long caller_fn = (unsigned long) func;
unsigned long pc = (unsigned long) callsite;
unsigned long branch = arm_gen_branch(pc, caller_fn);
unsigned long nop = 0xe1a00000; /* mov r0, r0 */
unsigned long nop = arm_gen_nop();
unsigned long old = enable ? nop : branch;
unsigned long new = enable ? branch : nop;

4
arch/arm/kernel/head-common.S
View File

@ -105,10 +105,8 @@ __mmap_switched:
mov r1, #0
bl __memset @ clear .bss
#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO
adr_l r0, init_task @ get swapper task_struct
set_current r0
#endif
set_current r0, r1
ldmia r4, {r0, r1, r2, r3}
str r9, [r0] @ Save processor ID

7
arch/arm/kernel/head.S
View File

@ -424,6 +424,13 @@ ENDPROC(secondary_startup)
ENDPROC(secondary_startup_arm)
ENTRY(__secondary_switched)
#if defined(CONFIG_VMAP_STACK) && !defined(CONFIG_ARM_LPAE)
@ Before using the vmap'ed stack, we have to switch to swapper_pg_dir
@ as the ID map does not cover the vmalloc region.
mrc p15, 0, ip, c2, c0, 1 @ read TTBR1
mcr p15, 0, ip, c2, c0, 0 @ set TTBR0
instr_sync
#endif
adr_l r7, secondary_data + 12 @ get secondary_data.stack
ldr sp, [r7]
ldr r0, [r7, #4] @ get secondary_data.task

61
arch/arm/kernel/irq.c
View File

@ -36,13 +36,53 @@
#include <asm/hardware/cache-l2x0.h>
#include <asm/hardware/cache-uniphier.h>
#include <asm/outercache.h>
#include <asm/softirq_stack.h>
#include <asm/exception.h>
#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include "reboot.h"
unsigned long irq_err_count;
#ifdef CONFIG_IRQSTACKS
asmlinkage DEFINE_PER_CPU_READ_MOSTLY(u8 *, irq_stack_ptr);
static void __init init_irq_stacks(void)
{
u8 *stack;
int cpu;
for_each_possible_cpu(cpu) {
if (!IS_ENABLED(CONFIG_VMAP_STACK))
stack = (u8 *)__get_free_pages(GFP_KERNEL,
THREAD_SIZE_ORDER);
else
stack = __vmalloc_node(THREAD_SIZE, THREAD_ALIGN,
THREADINFO_GFP, NUMA_NO_NODE,
__builtin_return_address(0));
if (WARN_ON(!stack))
break;
per_cpu(irq_stack_ptr, cpu) = &stack[THREAD_SIZE];
}
}
static void ____do_softirq(void *arg)
{
__do_softirq();
}
void do_softirq_own_stack(void)
{
call_with_stack(____do_softirq, NULL,
__this_cpu_read(irq_stack_ptr));
}
#endif
int arch_show_interrupts(struct seq_file *p, int prec)
{
#ifdef CONFIG_FIQ
@ -80,27 +120,14 @@ void handle_IRQ(unsigned int irq, struct pt_regs *regs)
ack_bad_irq(irq);
}
/*
* asm_do_IRQ is the interface to be used from assembly code.
*/
asmlinkage void __exception_irq_entry
asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs;
irq_enter();
old_regs = set_irq_regs(regs);
handle_IRQ(irq, regs);
set_irq_regs(old_regs);
irq_exit();
}
void __init init_IRQ(void)
{
int ret;
#ifdef CONFIG_IRQSTACKS
init_irq_stacks();
#endif
if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq)
irqchip_init();
else

90
arch/arm/kernel/module.c
View File

@ -68,6 +68,44 @@ bool module_exit_section(const char *name)
strstarts(name, ".ARM.exidx.exit");
}
#ifdef CONFIG_ARM_HAS_GROUP_RELOCS
/*
* This implements the partitioning algorithm for group relocations as
* documented in the ARM AArch32 ELF psABI (IHI 0044).
*
* A single PC-relative symbol reference is divided in up to 3 add or subtract
* operations, where the final one could be incorporated into a load/store
* instruction with immediate offset. E.g.,
*
* ADD Rd, PC, #... or ADD Rd, PC, #...
* ADD Rd, Rd, #... ADD Rd, Rd, #...
* LDR Rd, [Rd, #...] ADD Rd, Rd, #...
*
* The latter has a guaranteed range of only 16 MiB (3x8 == 24 bits), so it is
* of limited use in the kernel. However, the ADD/ADD/LDR combo has a range of
* -/+ 256 MiB, (2x8 + 12 == 28 bits), which means it has sufficient range for
* any in-kernel symbol reference (unless module PLTs are being used).
*
* The main advantage of this approach over the typical pattern using a literal
* load is that literal loads may miss in the D-cache, and generally lead to
* lower cache efficiency for variables that are referenced often from many
* different places in the code.
*/
static u32 get_group_rem(u32 group, u32 *offset)
{
u32 val = *offset;
u32 shift;
do {
shift = val ? (31 - __fls(val)) & ~1 : 32;
*offset = val;
if (!val)
break;
val &= 0xffffff >> shift;
} while (group--);
return shift;
}
#endif
int
apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
unsigned int relindex, struct module *module)
@ -82,6 +120,9 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
unsigned long loc;
Elf32_Sym *sym;
const char *symname;
#ifdef CONFIG_ARM_HAS_GROUP_RELOCS
u32 shift, group = 1;
#endif
s32 offset;
u32 tmp;
#ifdef CONFIG_THUMB2_KERNEL
@ -212,6 +253,55 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
*(u32 *)loc = __opcode_to_mem_arm(tmp);
break;
#ifdef CONFIG_ARM_HAS_GROUP_RELOCS
case R_ARM_ALU_PC_G0_NC:
group = 0;
fallthrough;
case R_ARM_ALU_PC_G1_NC:
tmp = __mem_to_opcode_arm(*(u32 *)loc);
offset = ror32(tmp & 0xff, (tmp & 0xf00) >> 7);
if (tmp & BIT(22))
offset = -offset;
offset += sym->st_value - loc;
if (offset < 0) {
offset = -offset;
tmp = (tmp & ~BIT(23)) | BIT(22); // SUB opcode
} else {
tmp = (tmp & ~BIT(22)) | BIT(23); // ADD opcode
}
shift = get_group_rem(group, &offset);
if (shift < 24) {
offset >>= 24 - shift;
offset |= (shift + 8) << 7;
}
*(u32 *)loc = __opcode_to_mem_arm((tmp & ~0xfff) | offset);
break;
case R_ARM_LDR_PC_G2:
tmp = __mem_to_opcode_arm(*(u32 *)loc);
offset = tmp & 0xfff;
if (~tmp & BIT(23)) // U bit cleared?
offset = -offset;
offset += sym->st_value - loc;
if (offset < 0) {
offset = -offset;
tmp &= ~BIT(23); // clear U bit
} else {
tmp |= BIT(23); // set U bit
}
get_group_rem(2, &offset);
if (offset > 0xfff) {
pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
module->name, relindex, i, symname,
ELF32_R_TYPE(rel->r_info), loc,
sym->st_value);
return -ENOEXEC;
}
*(u32 *)loc = __opcode_to_mem_arm((tmp & ~0xfff) | offset);
break;
#endif
#ifdef CONFIG_THUMB2_KERNEL
case R_ARM_THM_CALL:
case R_ARM_THM_JUMP24:

7
arch/arm/kernel/process.c
View File

@ -36,7 +36,7 @@
#include "signal.h"
#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO
#if defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)
DEFINE_PER_CPU(struct task_struct *, __entry_task);
#endif
@ -46,6 +46,11 @@ unsigned long __stack_chk_guard __read_mostly;
EXPORT_SYMBOL(__stack_chk_guard);
#endif
#ifndef CONFIG_CURRENT_POINTER_IN_TPIDRURO
asmlinkage struct task_struct *__current;
EXPORT_SYMBOL(__current);
#endif
static const char *processor_modes[] __maybe_unused = {
"USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
"UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",

3
arch/arm/kernel/return_address.c
View File

@ -41,7 +41,8 @@ void *return_address(unsigned int level)
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_stack_pointer;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)return_address;
here:
frame.pc = (unsigned long)&&here;
#ifdef CONFIG_KRETPROBES
frame.kr_cur = NULL;
frame.tsk = current;

8
arch/arm/kernel/setup.c
View File

@ -141,10 +141,10 @@ EXPORT_SYMBOL(outer_cache);
int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
struct stack {
u32 irq[3];
u32 abt[3];
u32 und[3];
u32 fiq[3];
u32 irq[4];
u32 abt[4];
u32 und[4];
u32 fiq[4];
} ____cacheline_aligned;
#ifndef CONFIG_CPU_V7M

13
arch/arm/kernel/sleep.S
View File

@ -67,6 +67,12 @@ ENTRY(__cpu_suspend)
ldr r4, =cpu_suspend_size
#endif
mov r5, sp @ current virtual SP
#ifdef CONFIG_VMAP_STACK
@ Run the suspend code from the overflow stack so we don't have to rely
@ on vmalloc-to-phys conversions anywhere in the arch suspend code.
@ The original SP value captured in R5 will be restored on the way out.
ldr_this_cpu sp, overflow_stack_ptr, r6, r7
#endif
add r4, r4, #12 @ Space for pgd, virt sp, phys resume fn
sub sp, sp, r4 @ allocate CPU state on stack
ldr r3, =sleep_save_sp
@ -113,6 +119,13 @@ ENTRY(cpu_resume_mmu)
ENDPROC(cpu_resume_mmu)
.popsection
cpu_resume_after_mmu:
#if defined(CONFIG_VMAP_STACK) && !defined(CONFIG_ARM_LPAE)
@ Before using the vmap'ed stack, we have to switch to swapper_pg_dir
@ as the ID map does not cover the vmalloc region.
mrc p15, 0, ip, c2, c0, 1 @ read TTBR1
mcr p15, 0, ip, c2, c0, 0 @ set TTBR0
instr_sync
#endif
bl cpu_init @ restore the und/abt/irq banked regs
mov r0, #0 @ return zero on success
ldmfd sp!, {r4 - r11, pc}

11
arch/arm/kernel/smp.c
View File

@ -400,6 +400,12 @@ static void smp_store_cpu_info(unsigned int cpuid)
check_cpu_icache_size(cpuid);
}
static void set_current(struct task_struct *cur)
{
/* Set TPIDRURO */
asm("mcr p15, 0, %0, c13, c0, 3" :: "r"(cur) : "memory");
}
/*
* This is the secondary CPU boot entry. We're using this CPUs
* idle thread stack, but a set of temporary page tables.
@ -628,11 +634,6 @@ static void ipi_complete(unsigned int cpu)
/*
* Main handler for inter-processor interrupts
*/
asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
{
handle_IPI(ipinr, regs);
}
static void do_handle_IPI(int ipinr)
{
unsigned int cpu = smp_processor_id();

3
arch/arm/kernel/stacktrace.c
View File

@ -160,7 +160,8 @@ static noinline void __save_stack_trace(struct task_struct *tsk,
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_stack_pointer;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)__save_stack_trace;
here:
frame.pc = (unsigned long)&&here;
}
#ifdef CONFIG_KRETPROBES
frame.kr_cur = NULL;

93
arch/arm/kernel/traps.c
View File

@ -36,6 +36,7 @@
#include <asm/ptrace.h>
#include <asm/unwind.h>
#include <asm/tls.h>
#include <asm/stacktrace.h>
#include <asm/system_misc.h>
#include <asm/opcodes.h>
@ -61,13 +62,24 @@ static int __init user_debug_setup(char *str)
__setup("user_debug=", user_debug_setup);
#endif
static void dump_mem(const char *, const char *, unsigned long, unsigned long);
void dump_backtrace_entry(unsigned long where, unsigned long from,
unsigned long frame, const char *loglvl)
{
unsigned long end = frame + 4 + sizeof(struct pt_regs);
if (IS_ENABLED(CONFIG_UNWINDER_FRAME_POINTER) &&
IS_ENABLED(CONFIG_CC_IS_GCC) &&
end > ALIGN(frame, THREAD_SIZE)) {
/*
* If we are walking past the end of the stack, it may be due
* to the fact that we are on an IRQ or overflow stack. In this
* case, we can load the address of the other stack from the
* frame record.
*/
frame = ((unsigned long *)frame)[-2] - 4;
end = frame + 4 + sizeof(struct pt_regs);
}
#ifndef CONFIG_KALLSYMS
printk("%sFunction entered at [<%08lx>] from [<%08lx>]\n",
loglvl, where, from);
@ -111,7 +123,8 @@ void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl)
static int verify_stack(unsigned long sp)
{
if (sp < PAGE_OFFSET ||
(sp > (unsigned long)high_memory && high_memory != NULL))
(!IS_ENABLED(CONFIG_VMAP_STACK) &&
sp > (unsigned long)high_memory && high_memory != NULL))
return -EFAULT;
return 0;
@ -121,8 +134,8 @@ static int verify_stack(unsigned long sp)
/*
* Dump out the contents of some memory nicely...
*/
static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
unsigned long top)
void dump_mem(const char *lvl, const char *str, unsigned long bottom,
unsigned long top)
{
unsigned long first;
int i;
@ -281,7 +294,8 @@ static int __die(const char *str, int err, struct pt_regs *regs)
if (!user_mode(regs) || in_interrupt()) {
dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp,
THREAD_SIZE + (unsigned long)task_stack_page(tsk));
ALIGN(regs->ARM_sp - THREAD_SIZE, THREAD_ALIGN)
+ THREAD_SIZE);
dump_backtrace(regs, tsk, KERN_EMERG);
dump_instr(KERN_EMERG, regs);
}
@ -880,3 +894,70 @@ void __init early_trap_init(void *vectors_base)
*/
}
#endif
#ifdef CONFIG_VMAP_STACK
DECLARE_PER_CPU(u8 *, irq_stack_ptr);
asmlinkage DEFINE_PER_CPU(u8 *, overflow_stack_ptr);
static int __init allocate_overflow_stacks(void)
{
u8 *stack;
int cpu;
for_each_possible_cpu(cpu) {
stack = (u8 *)__get_free_page(GFP_KERNEL);
if (WARN_ON(!stack))
return -ENOMEM;
per_cpu(overflow_stack_ptr, cpu) = &stack[OVERFLOW_STACK_SIZE];
}
return 0;
}
early_initcall(allocate_overflow_stacks);
asmlinkage void handle_bad_stack(struct pt_regs *regs)
{
unsigned long tsk_stk = (unsigned long)current->stack;
#ifdef CONFIG_IRQSTACKS
unsigned long irq_stk = (unsigned long)this_cpu_read(irq_stack_ptr);
#endif
unsigned long ovf_stk = (unsigned long)this_cpu_read(overflow_stack_ptr);
console_verbose();
pr_emerg("Insufficient stack space to handle exception!");
pr_emerg("Task stack: [0x%08lx..0x%08lx]\n",
tsk_stk, tsk_stk + THREAD_SIZE);
#ifdef CONFIG_IRQSTACKS
pr_emerg("IRQ stack: [0x%08lx..0x%08lx]\n",
irq_stk - THREAD_SIZE, irq_stk);
#endif
pr_emerg("Overflow stack: [0x%08lx..0x%08lx]\n",
ovf_stk - OVERFLOW_STACK_SIZE, ovf_stk);
die("kernel stack overflow", regs, 0);
}
#ifndef CONFIG_ARM_LPAE
/*
* Normally, we rely on the logic in do_translation_fault() to update stale PMD
* entries covering the vmalloc space in a task's page tables when it first
* accesses the region in question. Unfortunately, this is not sufficient when
* the task stack resides in the vmalloc region, as do_translation_fault() is a
* C function that needs a stack to run.
*
* So we need to ensure that these PMD entries are up to date *before* the MM
* switch. As we already have some logic in the MM switch path that takes care
* of this, let's trigger it by bumping the counter every time the core vmalloc
* code modifies a PMD entry in the vmalloc region. Use release semantics on
* the store so that other CPUs observing the counter's new value are
* guaranteed to see the updated page table entries as well.
*/
void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
{
if (start < VMALLOC_END && end > VMALLOC_START)
atomic_inc_return_release(&init_mm.context.vmalloc_seq);
}
#endif
#endif

64
arch/arm/kernel/unwind.c
View File

@ -33,6 +33,8 @@
#include <asm/traps.h>
#include <asm/unwind.h>
#include "reboot.h"
/* Dummy functions to avoid linker complaints */
void __aeabi_unwind_cpp_pr0(void)
{
@ -53,6 +55,7 @@ struct unwind_ctrl_block {
unsigned long vrs[16]; /* virtual register set */
const unsigned long *insn; /* pointer to the current instructions word */
unsigned long sp_high; /* highest value of sp allowed */
unsigned long *lr_addr; /* address of LR value on the stack */
/*
* 1 : check for stack overflow for each register pop.
* 0 : save overhead if there is plenty of stack remaining.
@ -237,6 +240,8 @@ static int unwind_pop_register(struct unwind_ctrl_block *ctrl,
* from being tracked by KASAN.
*/
ctrl->vrs[reg] = READ_ONCE_NOCHECK(*(*vsp));
if (reg == 14)
ctrl->lr_addr = *vsp;
(*vsp)++;
return URC_OK;
}
@ -256,8 +261,9 @@ static int unwind_exec_pop_subset_r4_to_r13(struct unwind_ctrl_block *ctrl,
mask >>= 1;
reg++;
}
if (!load_sp)
if (!load_sp) {
ctrl->vrs[SP] = (unsigned long)vsp;
}
return URC_OK;
}
@ -313,9 +319,9 @@ static int unwind_exec_insn(struct unwind_ctrl_block *ctrl)
if ((insn & 0xc0) == 0x00)
ctrl->vrs[SP] += ((insn & 0x3f) << 2) + 4;
else if ((insn & 0xc0) == 0x40)
else if ((insn & 0xc0) == 0x40) {
ctrl->vrs[SP] -= ((insn & 0x3f) << 2) + 4;
else if ((insn & 0xf0) == 0x80) {
} else if ((insn & 0xf0) == 0x80) {
unsigned long mask;
insn = (insn << 8) | unwind_get_byte(ctrl);
@ -330,9 +336,9 @@ static int unwind_exec_insn(struct unwind_ctrl_block *ctrl)
if (ret)
goto error;
} else if ((insn & 0xf0) == 0x90 &&
(insn & 0x0d) != 0x0d)
(insn & 0x0d) != 0x0d) {
ctrl->vrs[SP] = ctrl->vrs[insn & 0x0f];
else if ((insn & 0xf0) == 0xa0) {
} else if ((insn & 0xf0) == 0xa0) {
ret = unwind_exec_pop_r4_to_rN(ctrl, insn);
if (ret)
goto error;
@ -375,23 +381,22 @@ error:
*/
int unwind_frame(struct stackframe *frame)
{
unsigned long low;
const struct unwind_idx *idx;
struct unwind_ctrl_block ctrl;
unsigned long sp_low;
/* store the highest address on the stack to avoid crossing it*/
low = frame->sp;
ctrl.sp_high = ALIGN(low, THREAD_SIZE);
sp_low = frame->sp;
ctrl.sp_high = ALIGN(sp_low - THREAD_SIZE, THREAD_ALIGN)
+ THREAD_SIZE;
pr_debug("%s(pc = %08lx lr = %08lx sp = %08lx)\n", __func__,
frame->pc, frame->lr, frame->sp);
if (!kernel_text_address(frame->pc))
return -URC_FAILURE;
idx = unwind_find_idx(frame->pc);
if (!idx) {
pr_warn("unwind: Index not found %08lx\n", frame->pc);
if (frame->pc && kernel_text_address(frame->pc))
pr_warn("unwind: Index not found %08lx\n", frame->pc);
return -URC_FAILURE;
}
@ -403,7 +408,20 @@ int unwind_frame(struct stackframe *frame)
if (idx->insn == 1)
/* can't unwind */
return -URC_FAILURE;
else if ((idx->insn & 0x80000000) == 0)
else if (frame->pc == prel31_to_addr(&idx->addr_offset)) {
/*
* Unwinding is tricky when we're halfway through the prologue,
* since the stack frame that the unwinder expects may not be
* fully set up yet. However, one thing we do know for sure is
* that if we are unwinding from the very first instruction of
* a function, we are still effectively in the stack frame of
* the caller, and the unwind info has no relevance yet.
*/
if (frame->pc == frame->lr)
return -URC_FAILURE;
frame->pc = frame->lr;
return URC_OK;
} else if ((idx->insn & 0x80000000) == 0)
/* prel31 to the unwind table */
ctrl.insn = (unsigned long *)prel31_to_addr(&idx->insn);
else if ((idx->insn & 0xff000000) == 0x80000000)
@ -430,6 +448,16 @@ int unwind_frame(struct stackframe *frame)
ctrl.check_each_pop = 0;
if (prel31_to_addr(&idx->addr_offset) == (u32)&call_with_stack) {
/*
* call_with_stack() is the only place where we permit SP to
* jump from one stack to another, and since we know it is
* guaranteed to happen, set up the SP bounds accordingly.
*/
sp_low = frame->fp;
ctrl.sp_high = ALIGN(frame->fp, THREAD_SIZE);
}
while (ctrl.entries > 0) {
int urc;
if ((ctrl.sp_high - ctrl.vrs[SP]) < sizeof(ctrl.vrs))
@ -437,7 +465,7 @@ int unwind_frame(struct stackframe *frame)
urc = unwind_exec_insn(&ctrl);
if (urc < 0)
return urc;
if (ctrl.vrs[SP] < low || ctrl.vrs[SP] >= ctrl.sp_high)
if (ctrl.vrs[SP] < sp_low || ctrl.vrs[SP] > ctrl.sp_high)
return -URC_FAILURE;
}
@ -452,6 +480,7 @@ int unwind_frame(struct stackframe *frame)
frame->sp = ctrl.vrs[SP];
frame->lr = ctrl.vrs[LR];
frame->pc = ctrl.vrs[PC];
frame->lr_addr = ctrl.lr_addr;
return URC_OK;
}
@ -475,7 +504,12 @@ void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk,
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_stack_pointer;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)unwind_backtrace;
/* We are saving the stack and execution state at this
* point, so we should ensure that frame.pc is within
* this block of code.
*/
here:
frame.pc = (unsigned long)&&here;
} else {
/* task blocked in __switch_to */
frame.fp = thread_saved_fp(tsk);

4
arch/arm/kernel/vmlinux.lds.S
View File

@ -138,12 +138,12 @@ SECTIONS
#ifdef CONFIG_STRICT_KERNEL_RWX
. = ALIGN(1<<SECTION_SHIFT);
#else
. = ALIGN(THREAD_SIZE);
. = ALIGN(THREAD_ALIGN);
#endif
__init_end = .;
_sdata = .;
RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
_edata = .;
BSS_SECTION(0, 0, 0)

14
arch/arm/lib/backtrace-clang.S
View File

@ -144,7 +144,7 @@ for_each_frame: tst frame, mask @ Check for address exceptions
*/
1003: ldr sv_lr, [sv_fp, #4] @ get saved lr from next frame
ldr r0, [sv_lr, #-4] @ get call instruction
1004: ldr r0, [sv_lr, #-4] @ get call instruction
ldr r3, .Lopcode+4
and r2, r3, r0 @ is this a bl call
teq r2, r3
@ -164,7 +164,7 @@ finished_setup:
/*
* Print the function (sv_pc) and where it was called from (sv_lr).
*/
1004: mov r0, sv_pc
mov r0, sv_pc
mov r1, sv_lr
mov r2, frame
@ -197,6 +197,14 @@ finished_setup:
cmp sv_fp, frame @ next frame must be
mov frame, sv_fp @ above the current frame
#ifdef CONFIG_IRQSTACKS
@
@ Kernel stacks may be discontiguous in memory. If the next
@ frame is below the previous frame, accept it as long as it
@ lives in kernel memory.
@
cmpls sv_fp, #PAGE_OFFSET
#endif
bhi for_each_frame
1006: adr r0, .Lbad
@ -210,7 +218,7 @@ ENDPROC(c_backtrace)
.long 1001b, 1006b
.long 1002b, 1006b
.long 1003b, 1006b
.long 1004b, 1006b
.long 1004b, finished_setup
.long 1005b, 1006b
.popsection

8
arch/arm/lib/backtrace.S
View File

@ -98,6 +98,14 @@ for_each_frame: tst frame, mask @ Check for address exceptions
cmp sv_fp, frame @ next frame must be
mov frame, sv_fp @ above the current frame
#ifdef CONFIG_IRQSTACKS
@
@ Kernel stacks may be discontiguous in memory. If the next
@ frame is below the previous frame, accept it as long as it
@ lives in kernel memory.
@
cmpls sv_fp, #PAGE_OFFSET
#endif
bhi for_each_frame
1006: adr r0, .Lbad

33
arch/arm/lib/call_with_stack.S
View File

@ -8,25 +8,42 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/unwind.h>
/*
* void call_with_stack(void (*fn)(void *), void *arg, void *sp)
*
* Change the stack to that pointed at by sp, then invoke fn(arg) with
* the new stack.
*
* The sequence below follows the APCS frame convention for frame pointer
* unwinding, and implements the unwinder annotations needed by the EABI
* unwinder.
*/
ENTRY(call_with_stack)
str sp, [r2, #-4]!
str lr, [r2, #-4]!
ENTRY(call_with_stack)
#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)
mov ip, sp
push {fp, ip, lr, pc}
sub fp, ip, #4
#else
UNWIND( .fnstart )
UNWIND( .save {fpreg, lr} )
push {fpreg, lr}
UNWIND( .setfp fpreg, sp )
mov fpreg, sp
#endif
mov sp, r2
mov r2, r0
mov r0, r1
badr lr, 1f
ret r2
bl_r r2
1: ldr lr, [sp]
ldr sp, [sp, #4]
ret lr
#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)
ldmdb fp, {fp, sp, pc}
#else
mov sp, fpreg
pop {fpreg, pc}
UNWIND( .fnend )
#endif
ENDPROC(call_with_stack)

13
arch/arm/lib/copy_from_user.S
View File

@ -91,18 +91,15 @@
strb\cond \reg, [\ptr], #1
.endm
.macro enter reg1 reg2
.macro enter regs:vararg
mov r3, #0
stmdb sp!, {r0, r2, r3, \reg1, \reg2}
UNWIND( .save {r0, r2, r3, \regs} )
stmdb sp!, {r0, r2, r3, \regs}
.endm
.macro usave reg1 reg2
UNWIND( .save {r0, r2, r3, \reg1, \reg2} )
.endm
.macro exit reg1 reg2
.macro exit regs:vararg
add sp, sp, #8
ldmfd sp!, {r0, \reg1, \reg2}
ldmfd sp!, {r0, \regs}
.endm
.text

67
arch/arm/lib/copy_template.S
View File

@ -69,13 +69,10 @@
* than one 32bit instruction in Thumb-2)
*/
UNWIND( .fnstart )
enter r4, lr
UNWIND( .fnend )
UNWIND( .fnstart )
usave r4, lr @ in first stmdb block
enter r4, UNWIND(fpreg,) lr
UNWIND( .setfp fpreg, sp )
UNWIND( mov fpreg, sp )
subs r2, r2, #4
blt 8f
@ -86,12 +83,7 @@
bne 10f
1: subs r2, r2, #(28)
stmfd sp!, {r5 - r8}
UNWIND( .fnend )
UNWIND( .fnstart )
usave r4, lr
UNWIND( .save {r5 - r8} ) @ in second stmfd block
stmfd sp!, {r5, r6, r8, r9}
blt 5f
CALGN( ands ip, r0, #31 )
@ -110,9 +102,9 @@
PLD( pld [r1, #92] )
3: PLD( pld [r1, #124] )
4: ldr8w r1, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
4: ldr8w r1, r3, r4, r5, r6, r8, r9, ip, lr, abort=20f
subs r2, r2, #32
str8w r0, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
str8w r0, r3, r4, r5, r6, r8, r9, ip, lr, abort=20f
bge 3b
PLD( cmn r2, #96 )
PLD( bge 4b )
@ -132,8 +124,8 @@
ldr1w r1, r4, abort=20f
ldr1w r1, r5, abort=20f
ldr1w r1, r6, abort=20f
ldr1w r1, r7, abort=20f
ldr1w r1, r8, abort=20f
ldr1w r1, r9, abort=20f
ldr1w r1, lr, abort=20f
#if LDR1W_SHIFT < STR1W_SHIFT
@ -150,17 +142,14 @@
str1w r0, r4, abort=20f
str1w r0, r5, abort=20f
str1w r0, r6, abort=20f
str1w r0, r7, abort=20f
str1w r0, r8, abort=20f
str1w r0, r9, abort=20f
str1w r0, lr, abort=20f
CALGN( bcs 2b )
7: ldmfd sp!, {r5 - r8}
UNWIND( .fnend ) @ end of second stmfd block
7: ldmfd sp!, {r5, r6, r8, r9}
UNWIND( .fnstart )
usave r4, lr @ still in first stmdb block
8: movs r2, r2, lsl #31
ldr1b r1, r3, ne, abort=21f
ldr1b r1, r4, cs, abort=21f
@ -169,7 +158,7 @@
str1b r0, r4, cs, abort=21f
str1b r0, ip, cs, abort=21f
exit r4, pc
exit r4, UNWIND(fpreg,) pc
9: rsb ip, ip, #4
cmp ip, #2
@ -189,13 +178,10 @@
ldr1w r1, lr, abort=21f
beq 17f
bgt 18f
UNWIND( .fnend )
.macro forward_copy_shift pull push
UNWIND( .fnstart )
usave r4, lr @ still in first stmdb block
subs r2, r2, #28
blt 14f
@ -205,12 +191,8 @@
CALGN( subcc r2, r2, ip )
CALGN( bcc 15f )
11: stmfd sp!, {r5 - r9}
UNWIND( .fnend )
11: stmfd sp!, {r5, r6, r8 - r10}
UNWIND( .fnstart )
usave r4, lr
UNWIND( .save {r5 - r9} ) @ in new second stmfd block
PLD( pld [r1, #0] )
PLD( subs r2, r2, #96 )
PLD( pld [r1, #28] )
@ -219,35 +201,32 @@
PLD( pld [r1, #92] )
12: PLD( pld [r1, #124] )
13: ldr4w r1, r4, r5, r6, r7, abort=19f
13: ldr4w r1, r4, r5, r6, r8, abort=19f
mov r3, lr, lspull #\pull
subs r2, r2, #32
ldr4w r1, r8, r9, ip, lr, abort=19f
ldr4w r1, r9, r10, ip, lr, abort=19f
orr r3, r3, r4, lspush #\push
mov r4, r4, lspull #\pull
orr r4, r4, r5, lspush #\push
mov r5, r5, lspull #\pull
orr r5, r5, r6, lspush #\push
mov r6, r6, lspull #\pull
orr r6, r6, r7, lspush #\push
mov r7, r7, lspull #\pull
orr r7, r7, r8, lspush #\push
orr r6, r6, r8, lspush #\push
mov r8, r8, lspull #\pull
orr r8, r8, r9, lspush #\push
mov r9, r9, lspull #\pull
orr r9, r9, ip, lspush #\push
orr r9, r9, r10, lspush #\push
mov r10, r10, lspull #\pull
orr r10, r10, ip, lspush #\push
mov ip, ip, lspull #\pull
orr ip, ip, lr, lspush #\push
str8w r0, r3, r4, r5, r6, r7, r8, r9, ip, abort=19f
str8w r0, r3, r4, r5, r6, r8, r9, r10, ip, abort=19f
bge 12b
PLD( cmn r2, #96 )
PLD( bge 13b )
ldmfd sp!, {r5 - r9}
UNWIND( .fnend ) @ end of the second stmfd block
ldmfd sp!, {r5, r6, r8 - r10}
UNWIND( .fnstart )
usave r4, lr @ still in first stmdb block
14: ands ip, r2, #28
beq 16f
@ -262,7 +241,6 @@
16: sub r1, r1, #(\push / 8)
b 8b
UNWIND( .fnend )
.endm
@ -273,6 +251,7 @@
18: forward_copy_shift pull=24 push=8
UNWIND( .fnend )
/*
* Abort preamble and completion macros.
@ -282,13 +261,13 @@
*/
.macro copy_abort_preamble
19: ldmfd sp!, {r5 - r9}
19: ldmfd sp!, {r5, r6, r8 - r10}
b 21f
20: ldmfd sp!, {r5 - r8}
20: ldmfd sp!, {r5, r6, r8, r9}
21:
.endm
.macro copy_abort_end
ldmfd sp!, {r4, pc}
ldmfd sp!, {r4, UNWIND(fpreg,) pc}
.endm

13
arch/arm/lib/copy_to_user.S
View File

@ -90,18 +90,15 @@
strusr \reg, \ptr, 1, \cond, abort=\abort
.endm
.macro enter reg1 reg2
.macro enter regs:vararg
mov r3, #0
stmdb sp!, {r0, r2, r3, \reg1, \reg2}
UNWIND( .save {r0, r2, r3, \regs} )
stmdb sp!, {r0, r2, r3, \regs}
.endm
.macro usave reg1 reg2
UNWIND( .save {r0, r2, r3, \reg1, \reg2} )
.endm
.macro exit reg1 reg2
.macro exit regs:vararg
add sp, sp, #8
ldmfd sp!, {r0, \reg1, \reg2}
ldmfd sp!, {r0, \regs}
.endm
.text

13
arch/arm/lib/memcpy.S
View File

@ -42,16 +42,13 @@
strb\cond \reg, [\ptr], #1
.endm
.macro enter reg1 reg2
stmdb sp!, {r0, \reg1, \reg2}
.macro enter regs:vararg
UNWIND( .save {r0, \regs} )
stmdb sp!, {r0, \regs}
.endm
.macro usave reg1 reg2
UNWIND( .save {r0, \reg1, \reg2} )
.endm
.macro exit reg1 reg2
ldmfd sp!, {r0, \reg1, \reg2}
.macro exit regs:vararg
ldmfd sp!, {r0, \regs}
.endm
.text

60
arch/arm/lib/memmove.S
View File

@ -31,12 +31,13 @@ WEAK(memmove)
subs ip, r0, r1
cmphi r2, ip
bls __memcpy
stmfd sp!, {r0, r4, lr}
UNWIND( .fnend )
UNWIND( .fnstart )
UNWIND( .save {r0, r4, lr} ) @ in first stmfd block
UNWIND( .save {r0, r4, fpreg, lr} )
stmfd sp!, {r0, r4, UNWIND(fpreg,) lr}
UNWIND( .setfp fpreg, sp )
UNWIND( mov fpreg, sp )
add r1, r1, r2
add r0, r0, r2
subs r2, r2, #4
@ -48,12 +49,7 @@ WEAK(memmove)
bne 10f
1: subs r2, r2, #(28)
stmfd sp!, {r5 - r8}
UNWIND( .fnend )
UNWIND( .fnstart )
UNWIND( .save {r0, r4, lr} )
UNWIND( .save {r5 - r8} ) @ in second stmfd block
stmfd sp!, {r5, r6, r8, r9}
blt 5f
CALGN( ands ip, r0, #31 )
@ -72,9 +68,9 @@ WEAK(memmove)
PLD( pld [r1, #-96] )
3: PLD( pld [r1, #-128] )
4: ldmdb r1!, {r3, r4, r5, r6, r7, r8, ip, lr}
4: ldmdb r1!, {r3, r4, r5, r6, r8, r9, ip, lr}
subs r2, r2, #32
stmdb r0!, {r3, r4, r5, r6, r7, r8, ip, lr}
stmdb r0!, {r3, r4, r5, r6, r8, r9, ip, lr}
bge 3b
PLD( cmn r2, #96 )
PLD( bge 4b )
@ -88,8 +84,8 @@ WEAK(memmove)
W(ldr) r4, [r1, #-4]!
W(ldr) r5, [r1, #-4]!
W(ldr) r6, [r1, #-4]!
W(ldr) r7, [r1, #-4]!
W(ldr) r8, [r1, #-4]!
W(ldr) r9, [r1, #-4]!
W(ldr) lr, [r1, #-4]!
add pc, pc, ip
@ -99,17 +95,13 @@ WEAK(memmove)
W(str) r4, [r0, #-4]!
W(str) r5, [r0, #-4]!
W(str) r6, [r0, #-4]!
W(str) r7, [r0, #-4]!
W(str) r8, [r0, #-4]!
W(str) r9, [r0, #-4]!
W(str) lr, [r0, #-4]!
CALGN( bcs 2b )
7: ldmfd sp!, {r5 - r8}
UNWIND( .fnend ) @ end of second stmfd block
UNWIND( .fnstart )
UNWIND( .save {r0, r4, lr} ) @ still in first stmfd block
7: ldmfd sp!, {r5, r6, r8, r9}
8: movs r2, r2, lsl #31
ldrbne r3, [r1, #-1]!
@ -118,7 +110,7 @@ WEAK(memmove)
strbne r3, [r0, #-1]!
strbcs r4, [r0, #-1]!
strbcs ip, [r0, #-1]
ldmfd sp!, {r0, r4, pc}
ldmfd sp!, {r0, r4, UNWIND(fpreg,) pc}
9: cmp ip, #2
ldrbgt r3, [r1, #-1]!
@ -137,13 +129,10 @@ WEAK(memmove)
ldr r3, [r1, #0]
beq 17f
blt 18f
UNWIND( .fnend )
.macro backward_copy_shift push pull
UNWIND( .fnstart )
UNWIND( .save {r0, r4, lr} ) @ still in first stmfd block
subs r2, r2, #28
blt 14f
@ -152,12 +141,7 @@ WEAK(memmove)
CALGN( subcc r2, r2, ip )
CALGN( bcc 15f )
11: stmfd sp!, {r5 - r9}
UNWIND( .fnend )
UNWIND( .fnstart )
UNWIND( .save {r0, r4, lr} )
UNWIND( .save {r5 - r9} ) @ in new second stmfd block
11: stmfd sp!, {r5, r6, r8 - r10}
PLD( pld [r1, #-4] )
PLD( subs r2, r2, #96 )
@ -167,35 +151,31 @@ WEAK(memmove)
PLD( pld [r1, #-96] )
12: PLD( pld [r1, #-128] )
13: ldmdb r1!, {r7, r8, r9, ip}
13: ldmdb r1!, {r8, r9, r10, ip}
mov lr, r3, lspush #\push
subs r2, r2, #32
ldmdb r1!, {r3, r4, r5, r6}
orr lr, lr, ip, lspull #\pull
mov ip, ip, lspush #\push
orr ip, ip, r9, lspull #\pull
orr ip, ip, r10, lspull #\pull
mov r10, r10, lspush #\push
orr r10, r10, r9, lspull #\pull
mov r9, r9, lspush #\push
orr r9, r9, r8, lspull #\pull
mov r8, r8, lspush #\push
orr r8, r8, r7, lspull #\pull
mov r7, r7, lspush #\push
orr r7, r7, r6, lspull #\pull
orr r8, r8, r6, lspull #\pull
mov r6, r6, lspush #\push
orr r6, r6, r5, lspull #\pull
mov r5, r5, lspush #\push
orr r5, r5, r4, lspull #\pull
mov r4, r4, lspush #\push
orr r4, r4, r3, lspull #\pull
stmdb r0!, {r4 - r9, ip, lr}
stmdb r0!, {r4 - r6, r8 - r10, ip, lr}
bge 12b
PLD( cmn r2, #96 )
PLD( bge 13b )
ldmfd sp!, {r5 - r9}
UNWIND( .fnend ) @ end of the second stmfd block
UNWIND( .fnstart )
UNWIND( .save {r0, r4, lr} ) @ still in first stmfd block
ldmfd sp!, {r5, r6, r8 - r10}
14: ands ip, r2, #28
beq 16f
@ -211,7 +191,6 @@ WEAK(memmove)
16: add r1, r1, #(\pull / 8)
b 8b
UNWIND( .fnend )
.endm
@ -222,5 +201,6 @@ WEAK(memmove)
18: backward_copy_shift push=24 pull=8
UNWIND( .fnend )
ENDPROC(memmove)
ENDPROC(__memmove)

7
arch/arm/lib/memset.S
View File

@ -28,16 +28,16 @@ UNWIND( .fnstart )
mov r3, r1
7: cmp r2, #16
blt 4f
UNWIND( .fnend )
#if ! CALGN(1)+0
/*
* We need 2 extra registers for this loop - use r8 and the LR
*/
stmfd sp!, {r8, lr}
UNWIND( .fnend )
UNWIND( .fnstart )
UNWIND( .save {r8, lr} )
stmfd sp!, {r8, lr}
mov r8, r1
mov lr, r3
@ -66,10 +66,9 @@ UNWIND( .fnend )
* whole cache lines at once.
*/
stmfd sp!, {r4-r8, lr}
UNWIND( .fnend )
UNWIND( .fnstart )
UNWIND( .save {r4-r8, lr} )
stmfd sp!, {r4-r8, lr}
mov r4, r1
mov r5, r3
mov r6, r1

1
arch/arm/mach-bcm/Makefile
View File

@ -40,6 +40,7 @@ obj-$(CONFIG_ARCH_BCM_MOBILE_L2_CACHE) += kona_l2_cache.o
# Support for secure monitor traps
obj-$(CONFIG_ARCH_BCM_MOBILE_SMC) += bcm_kona_smc.o
CFLAGS_REMOVE_bcm_kona_smc.o += $(CC_FLAGS_FTRACE)
# BCM2835
ifeq ($(CONFIG_ARCH_BCM2835),y)

6
arch/arm/mach-exynos/mcpm-exynos.c
View File

@ -35,7 +35,6 @@ static bool secure_firmware __ro_after_init;
*/
#define exynos_v7_exit_coherency_flush(level) \
asm volatile( \
"stmfd sp!, {fp, ip}\n\t"\
"mrc p15, 0, r0, c1, c0, 0 @ get SCTLR\n\t" \
"bic r0, r0, #"__stringify(CR_C)"\n\t" \
"mcr p15, 0, r0, c1, c0, 0 @ set SCTLR\n\t" \
@ -50,11 +49,10 @@ static bool secure_firmware __ro_after_init;
"mcr p15, 0, r0, c1, c0, 1 @ set ACTLR\n\t" \
"isb\n\t" \
"dsb\n\t" \
"ldmfd sp!, {fp, ip}" \
: \
: "Ir" (pmu_base_addr + S5P_INFORM0) \
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
"r9", "r10", "lr", "memory")
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", \
"r9", "r10", "ip", "lr", "memory")
static int exynos_cpu_powerup(unsigned int cpu, unsigned int cluster)
{

87
arch/arm/mach-footbridge/common.c
View File

@ -27,6 +27,91 @@
#include "common.h"
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <asm/hardware/dec21285.h>
static int dc21285_get_irq(void)
{
void __iomem *irqstatus = (void __iomem *)CSR_IRQ_STATUS;
u32 mask = readl(irqstatus);
if (mask & IRQ_MASK_SDRAMPARITY)
return IRQ_SDRAMPARITY;
if (mask & IRQ_MASK_UART_RX)
return IRQ_CONRX;
if (mask & IRQ_MASK_DMA1)
return IRQ_DMA1;
if (mask & IRQ_MASK_DMA2)
return IRQ_DMA2;
if (mask & IRQ_MASK_IN0)
return IRQ_IN0;
if (mask & IRQ_MASK_IN1)
return IRQ_IN1;
if (mask & IRQ_MASK_IN2)
return IRQ_IN2;
if (mask & IRQ_MASK_IN3)
return IRQ_IN3;
if (mask & IRQ_MASK_PCI)
return IRQ_PCI;
if (mask & IRQ_MASK_DOORBELLHOST)
return IRQ_DOORBELLHOST;
if (mask & IRQ_MASK_I2OINPOST)
return IRQ_I2OINPOST;
if (mask & IRQ_MASK_TIMER1)
return IRQ_TIMER1;
if (mask & IRQ_MASK_TIMER2)
return IRQ_TIMER2;
if (mask & IRQ_MASK_TIMER3)
return IRQ_TIMER3;
if (mask & IRQ_MASK_UART_TX)
return IRQ_CONTX;
if (mask & IRQ_MASK_PCI_ABORT)
return IRQ_PCI_ABORT;
if (mask & IRQ_MASK_PCI_SERR)
return IRQ_PCI_SERR;
if (mask & IRQ_MASK_DISCARD_TIMER)
return IRQ_DISCARD_TIMER;
if (mask & IRQ_MASK_PCI_DPERR)
return IRQ_PCI_DPERR;
if (mask & IRQ_MASK_PCI_PERR)
return IRQ_PCI_PERR;
return 0;
}
static void dc21285_handle_irq(struct pt_regs *regs)
{
int irq;
do {
irq = dc21285_get_irq();
if (!irq)
break;
generic_handle_irq(irq);
} while (1);
}
unsigned int mem_fclk_21285 = 50000000;
EXPORT_SYMBOL(mem_fclk_21285);
@ -108,6 +193,8 @@ static void __init __fb_init_irq(void)
void __init footbridge_init_irq(void)
{
set_handle_irq(dc21285_handle_irq);
__fb_init_irq();
if (!footbridge_cfn_mode())

107
arch/arm/mach-footbridge/include/mach/entry-macro.S
View File

@ -1,107 +0,0 @@
/*
* arch/arm/mach-footbridge/include/mach/entry-macro.S
*
* Low-level IRQ helper macros for footbridge-based platforms
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <asm/hardware/dec21285.h>
.equ dc21285_high, ARMCSR_BASE & 0xff000000
.equ dc21285_low, ARMCSR_BASE & 0x00ffffff
.macro get_irqnr_preamble, base, tmp
mov \base, #dc21285_high
.if dc21285_low
orr \base, \base, #dc21285_low
.endif
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
ldr \irqstat, [\base, #0x180] @ get interrupts
mov \irqnr, #IRQ_SDRAMPARITY
tst \irqstat, #IRQ_MASK_SDRAMPARITY
bne 1001f
tst \irqstat, #IRQ_MASK_UART_RX
movne \irqnr, #IRQ_CONRX
bne 1001f
tst \irqstat, #IRQ_MASK_DMA1
movne \irqnr, #IRQ_DMA1
bne 1001f
tst \irqstat, #IRQ_MASK_DMA2
movne \irqnr, #IRQ_DMA2
bne 1001f
tst \irqstat, #IRQ_MASK_IN0
movne \irqnr, #IRQ_IN0
bne 1001f
tst \irqstat, #IRQ_MASK_IN1
movne \irqnr, #IRQ_IN1
bne 1001f
tst \irqstat, #IRQ_MASK_IN2
movne \irqnr, #IRQ_IN2
bne 1001f
tst \irqstat, #IRQ_MASK_IN3
movne \irqnr, #IRQ_IN3
bne 1001f
tst \irqstat, #IRQ_MASK_PCI
movne \irqnr, #IRQ_PCI
bne 1001f
tst \irqstat, #IRQ_MASK_DOORBELLHOST
movne \irqnr, #IRQ_DOORBELLHOST
bne 1001f
tst \irqstat, #IRQ_MASK_I2OINPOST
movne \irqnr, #IRQ_I2OINPOST
bne 1001f
tst \irqstat, #IRQ_MASK_TIMER1
movne \irqnr, #IRQ_TIMER1
bne 1001f
tst \irqstat, #IRQ_MASK_TIMER2
movne \irqnr, #IRQ_TIMER2
bne 1001f
tst \irqstat, #IRQ_MASK_TIMER3
movne \irqnr, #IRQ_TIMER3
bne 1001f
tst \irqstat, #IRQ_MASK_UART_TX
movne \irqnr, #IRQ_CONTX
bne 1001f
tst \irqstat, #IRQ_MASK_PCI_ABORT
movne \irqnr, #IRQ_PCI_ABORT
bne 1001f
tst \irqstat, #IRQ_MASK_PCI_SERR
movne \irqnr, #IRQ_PCI_SERR
bne 1001f
tst \irqstat, #IRQ_MASK_DISCARD_TIMER
movne \irqnr, #IRQ_DISCARD_TIMER
bne 1001f
tst \irqstat, #IRQ_MASK_PCI_DPERR
movne \irqnr, #IRQ_PCI_DPERR
bne 1001f
tst \irqstat, #IRQ_MASK_PCI_PERR
movne \irqnr, #IRQ_PCI_PERR
1001:
.endm

10
arch/arm/mach-iop32x/cp6.c
View File

@ -7,7 +7,7 @@
#include <asm/traps.h>
#include <asm/ptrace.h>
static int cp6_trap(struct pt_regs *regs, unsigned int instr)
void iop_enable_cp6(void)
{
u32 temp;
@ -16,7 +16,15 @@ static int cp6_trap(struct pt_regs *regs, unsigned int instr)
"mrc p15, 0, %0, c15, c1, 0\n\t"
"orr %0, %0, #(1 << 6)\n\t"
"mcr p15, 0, %0, c15, c1, 0\n\t"
"mrc p15, 0, %0, c15, c1, 0\n\t"
"mov %0, %0\n\t"
"sub pc, pc, #4 @ cp_wait\n\t"
: "=r"(temp));
}
static int cp6_trap(struct pt_regs *regs, unsigned int instr)
{
iop_enable_cp6();
return 0;
}

31
arch/arm/mach-iop32x/include/mach/entry-macro.S
View File

@ -1,31 +0,0 @@
/*
* arch/arm/mach-iop32x/include/mach/entry-macro.S
*
* Low-level IRQ helper macros for IOP32x-based platforms
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
.macro get_irqnr_preamble, base, tmp
mrc p15, 0, \tmp, c15, c1, 0
orr \tmp, \tmp, #(1 << 6)
mcr p15, 0, \tmp, c15, c1, 0 @ Enable cp6 access
mrc p15, 0, \tmp, c15, c1, 0
mov \tmp, \tmp
sub pc, pc, #4 @ cp_wait
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
mrc p6, 0, \irqstat, c8, c0, 0 @ Read IINTSRC
cmp \irqstat, #0
clzne \irqnr, \irqstat
rsbne \irqnr, \irqnr, #31
.endm
.macro arch_ret_to_user, tmp1, tmp2
mrc p15, 0, \tmp1, c15, c1, 0
ands \tmp2, \tmp1, #(1 << 6)
bicne \tmp1, \tmp1, #(1 << 6)
mcrne p15, 0, \tmp1, c15, c1, 0 @ Disable cp6 access
.endm

2
arch/arm/mach-iop32x/include/mach/irqs.h
View File

@ -9,6 +9,6 @@
#ifndef __IRQS_H
#define __IRQS_H
#define NR_IRQS 32
#define NR_IRQS 33
#endif

1
arch/arm/mach-iop32x/iop3xx.h
View File

@ -225,6 +225,7 @@ extern int iop3xx_get_init_atu(void);
#include <linux/reboot.h>
void iop3xx_map_io(void);
void iop_enable_cp6(void);
void iop_init_cp6_handler(void);
void iop_init_time(unsigned long tickrate);
void iop3xx_restart(enum reboot_mode, const char *);

29
arch/arm/mach-iop32x/irq.c
View File

@ -29,17 +29,26 @@ static void intstr_write(u32 val)
asm volatile("mcr p6, 0, %0, c4, c0, 0" : : "r" (val));
}
static u32 iintsrc_read(void)
{
int irq;
asm volatile("mrc p6, 0, %0, c8, c0, 0" : "=r" (irq));
return irq;
}
static void
iop32x_irq_mask(struct irq_data *d)
{
iop32x_mask &= ~(1 << d->irq);
iop32x_mask &= ~(1 << (d->irq - 1));
intctl_write(iop32x_mask);
}
static void
iop32x_irq_unmask(struct irq_data *d)
{
iop32x_mask |= 1 << d->irq;
iop32x_mask |= 1 << (d->irq - 1);
intctl_write(iop32x_mask);
}
@ -50,11 +59,25 @@ struct irq_chip ext_chip = {
.irq_unmask = iop32x_irq_unmask,
};
static void iop_handle_irq(struct pt_regs *regs)
{
u32 mask;
iop_enable_cp6();
do {
mask = iintsrc_read();
if (mask)
generic_handle_irq(fls(mask));
} while (mask);
}
void __init iop32x_init_irq(void)
{
int i;
iop_init_cp6_handler();
set_handle_irq(iop_handle_irq);
intctl_write(0);
intstr_write(0);
@ -65,7 +88,7 @@ void __init iop32x_init_irq(void)
machine_is_em7210())
*IOP3XX_PCIIRSR = 0x0f;
for (i = 0; i < NR_IRQS; i++) {
for (i = 1; i < NR_IRQS; i++) {
irq_set_chip_and_handler(i, &ext_chip, handle_level_irq);
irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
}

60
arch/arm/mach-iop32x/irqs.h
View File

@ -7,36 +7,40 @@
#ifndef __IOP32X_IRQS_H
#define __IOP32X_IRQS_H
/* Interrupts in Linux start at 1, hardware starts at 0 */
#define IOP_IRQ(x) ((x) + 1)
/*
* IOP80321 chipset interrupts
*/
#define IRQ_IOP32X_DMA0_EOT 0
#define IRQ_IOP32X_DMA0_EOC 1
#define IRQ_IOP32X_DMA1_EOT 2
#define IRQ_IOP32X_DMA1_EOC 3
#define IRQ_IOP32X_AA_EOT 6
#define IRQ_IOP32X_AA_EOC 7
#define IRQ_IOP32X_CORE_PMON 8
#define IRQ_IOP32X_TIMER0 9
#define IRQ_IOP32X_TIMER1 10
#define IRQ_IOP32X_I2C_0 11
#define IRQ_IOP32X_I2C_1 12
#define IRQ_IOP32X_MESSAGING 13
#define IRQ_IOP32X_ATU_BIST 14
#define IRQ_IOP32X_PERFMON 15
#define IRQ_IOP32X_CORE_PMU 16
#define IRQ_IOP32X_BIU_ERR 17
#define IRQ_IOP32X_ATU_ERR 18
#define IRQ_IOP32X_MCU_ERR 19
#define IRQ_IOP32X_DMA0_ERR 20
#define IRQ_IOP32X_DMA1_ERR 21
#define IRQ_IOP32X_AA_ERR 23
#define IRQ_IOP32X_MSG_ERR 24
#define IRQ_IOP32X_SSP 25
#define IRQ_IOP32X_XINT0 27
#define IRQ_IOP32X_XINT1 28
#define IRQ_IOP32X_XINT2 29
#define IRQ_IOP32X_XINT3 30
#define IRQ_IOP32X_HPI 31
#define IRQ_IOP32X_DMA0_EOT IOP_IRQ(0)
#define IRQ_IOP32X_DMA0_EOC IOP_IRQ(1)
#define IRQ_IOP32X_DMA1_EOT IOP_IRQ(2)
#define IRQ_IOP32X_DMA1_EOC IOP_IRQ(3)
#define IRQ_IOP32X_AA_EOT IOP_IRQ(6)
#define IRQ_IOP32X_AA_EOC IOP_IRQ(7)
#define IRQ_IOP32X_CORE_PMON IOP_IRQ(8)
#define IRQ_IOP32X_TIMER0 IOP_IRQ(9)
#define IRQ_IOP32X_TIMER1 IOP_IRQ(10)
#define IRQ_IOP32X_I2C_0 IOP_IRQ(11)
#define IRQ_IOP32X_I2C_1 IOP_IRQ(12)
#define IRQ_IOP32X_MESSAGING IOP_IRQ(13)
#define IRQ_IOP32X_ATU_BIST IOP_IRQ(14)
#define IRQ_IOP32X_PERFMON IOP_IRQ(15)
#define IRQ_IOP32X_CORE_PMU IOP_IRQ(16)
#define IRQ_IOP32X_BIU_ERR IOP_IRQ(17)
#define IRQ_IOP32X_ATU_ERR IOP_IRQ(18)
#define IRQ_IOP32X_MCU_ERR IOP_IRQ(19)
#define IRQ_IOP32X_DMA0_ERR IOP_IRQ(20)
#define IRQ_IOP32X_DMA1_ERR IOP_IRQ(21)
#define IRQ_IOP32X_AA_ERR IOP_IRQ(23)
#define IRQ_IOP32X_MSG_ERR IOP_IRQ(24)
#define IRQ_IOP32X_SSP IOP_IRQ(25)
#define IRQ_IOP32X_XINT0 IOP_IRQ(27)
#define IRQ_IOP32X_XINT1 IOP_IRQ(28)
#define IRQ_IOP32X_XINT2 IOP_IRQ(29)
#define IRQ_IOP32X_XINT3 IOP_IRQ(30)
#define IRQ_IOP32X_HPI IOP_IRQ(31)
#endif

5
arch/arm/mach-rpc/fiq.S
View File

@ -2,10 +2,11 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <mach/hardware.h>
#include <mach/entry-macro.S>
.equ ioc_base_high, IOC_BASE & 0xff000000
.equ ioc_base_low, IOC_BASE & 0x00ff0000
.text
.global rpc_default_fiq_end
ENTRY(rpc_default_fiq_start)
mov r12, #ioc_base_high

13
arch/arm/mach-rpc/include/mach/entry-macro.S
View File

@ -1,13 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <mach/hardware.h>
#include <asm/hardware/entry-macro-iomd.S>
.equ ioc_base_high, IOC_BASE & 0xff000000
.equ ioc_base_low, IOC_BASE & 0x00ff0000
.macro get_irqnr_preamble, base, tmp
mov \base, #ioc_base_high @ point at IOC
.if ioc_base_low
orr \base, \base, #ioc_base_low
.endif
.endm

95
arch/arm/mach-rpc/irq.c
View File

@ -14,6 +14,99 @@
#define CLR 0x04
#define MASK 0x08
static const u8 irq_prio_h[256] = {
0, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10,
12, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10,
13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10,
14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10,
13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
};
static const u8 irq_prio_d[256] = {
0,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
20,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
};
static const u8 irq_prio_l[256] = {
0, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
4, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3,
6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
};
static int iomd_get_irq_nr(void)
{
int irq;
u8 reg;
/* get highest priority first */
reg = readb(IOC_BASE + IOMD_IRQREQB);
irq = irq_prio_h[reg];
if (irq)
return irq;
/* get DMA */
reg = readb(IOC_BASE + IOMD_DMAREQ);
irq = irq_prio_d[reg];
if (irq)
return irq;
/* get low priority */
reg = readb(IOC_BASE + IOMD_IRQREQA);
irq = irq_prio_l[reg];
if (irq)
return irq;
return 0;
}
static void iomd_handle_irq(struct pt_regs *regs)
{
int irq;
do {
irq = iomd_get_irq_nr();
if (irq)
generic_handle_irq(irq);
} while (irq);
}
static void __iomem *iomd_get_base(struct irq_data *d)
{
void *cd = irq_data_get_irq_chip_data(d);
@ -82,6 +175,8 @@ void __init rpc_init_irq(void)
set_fiq_handler(&rpc_default_fiq_start,
&rpc_default_fiq_end - &rpc_default_fiq_start);
set_handle_irq(iomd_handle_irq);
for (irq = 0; irq < NR_IRQS; irq++) {
clr = IRQ_NOREQUEST;
set = 0;

1
arch/arm/mm/Kconfig
View File

@ -386,6 +386,7 @@ config CPU_V6
select CPU_PABRT_V6
select CPU_THUMB_CAPABLE
select CPU_TLB_V6 if MMU
select SMP_ON_UP if SMP
# ARMv6k
config CPU_V6K

40
arch/arm/mm/cache-v7.S
View File

@ -90,7 +90,7 @@ ENDPROC(v7_flush_icache_all)
*
* Flush the D-cache up to the Level of Unification Inner Shareable
*
* Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
* Corrupted registers: r0-r6, r9-r10
*/
ENTRY(v7_flush_dcache_louis)
@ -117,7 +117,7 @@ ENDPROC(v7_flush_dcache_louis)
*
* Flush the whole D-cache.
*
* Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
* Corrupted registers: r0-r6, r9-r10
*
* - mm - mm_struct describing address space
*/
@ -149,22 +149,22 @@ flush_levels:
movw r4, #0x3ff
ands r4, r4, r1, lsr #3 @ find maximum number on the way size
clz r5, r4 @ find bit position of way size increment
movw r7, #0x7fff
ands r7, r7, r1, lsr #13 @ extract max number of the index size
movw r6, #0x7fff
and r1, r6, r1, lsr #13 @ extract max number of the index size
mov r6, #1
movne r4, r4, lsl r5 @ # of ways shifted into bits [31:...]
movne r6, r6, lsl r5 @ 1 shifted left by same amount
loop1:
mov r9, r7 @ create working copy of max index
mov r9, r1 @ create working copy of max index
loop2:
ARM( orr r11, r10, r4, lsl r5 ) @ factor way and cache number into r11
THUMB( lsl r6, r4, r5 )
THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
ARM( orr r11, r11, r9, lsl r2 ) @ factor index number into r11
THUMB( lsl r6, r9, r2 )
THUMB( orr r11, r11, r6 ) @ factor index number into r11
mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
mov r5, r9, lsl r2 @ factor set number into r5
orr r5, r5, r4 @ factor way number into r5
orr r5, r5, r10 @ factor cache level into r5
mcr p15, 0, r5, c7, c14, 2 @ clean & invalidate by set/way
subs r9, r9, #1 @ decrement the index
bge loop2
subs r4, r4, #1 @ decrement the way
bge loop1
subs r4, r4, r6 @ decrement the way
bcs loop1
skip:
add r10, r10, #2 @ increment cache number
cmp r3, r10
@ -192,14 +192,12 @@ ENDPROC(v7_flush_dcache_all)
*
*/
ENTRY(v7_flush_kern_cache_all)
ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} )
THUMB( stmfd sp!, {r4-r7, r9-r11, lr} )
stmfd sp!, {r4-r6, r9-r10, lr}
bl v7_flush_dcache_all
mov r0, #0
ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} )
THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} )
ldmfd sp!, {r4-r6, r9-r10, lr}
ret lr
ENDPROC(v7_flush_kern_cache_all)
@ -210,14 +208,12 @@ ENDPROC(v7_flush_kern_cache_all)
* Invalidate the I-cache to the point of unification.
*/
ENTRY(v7_flush_kern_cache_louis)
ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} )
THUMB( stmfd sp!, {r4-r7, r9-r11, lr} )
stmfd sp!, {r4-r6, r9-r10, lr}
bl v7_flush_dcache_louis
mov r0, #0
ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} )
THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} )
ldmfd sp!, {r4-r6, r9-r10, lr}
ret lr
ENDPROC(v7_flush_kern_cache_louis)

3
arch/arm/mm/context.c
View File

@ -240,8 +240,7 @@ void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk)
unsigned int cpu = smp_processor_id();
u64 asid;
if (unlikely(mm->context.vmalloc_seq != init_mm.context.vmalloc_seq))
__check_vmalloc_seq(mm);
check_vmalloc_seq(mm);
/*
* We cannot update the pgd and the ASID atomicly with classic

18
arch/arm/mm/ioremap.c
View File

@ -117,16 +117,21 @@ EXPORT_SYMBOL(ioremap_page);
void __check_vmalloc_seq(struct mm_struct *mm)
{
unsigned int seq;
int seq;
do {
seq = init_mm.context.vmalloc_seq;
seq = atomic_read(&init_mm.context.vmalloc_seq);
memcpy(pgd_offset(mm, VMALLOC_START),
pgd_offset_k(VMALLOC_START),
sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
pgd_index(VMALLOC_START)));
mm->context.vmalloc_seq = seq;
} while (seq != init_mm.context.vmalloc_seq);
/*
* Use a store-release so that other CPUs that observe the
* counter's new value are guaranteed to see the results of the
* memcpy as well.
*/
atomic_set_release(&mm->context.vmalloc_seq, seq);
} while (seq != atomic_read(&init_mm.context.vmalloc_seq));
}
#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
@ -157,7 +162,7 @@ static void unmap_area_sections(unsigned long virt, unsigned long size)
* Note: this is still racy on SMP machines.
*/
pmd_clear(pmdp);
init_mm.context.vmalloc_seq++;
atomic_inc_return_release(&init_mm.context.vmalloc_seq);
/*
* Free the page table, if there was one.
@ -174,8 +179,7 @@ static void unmap_area_sections(unsigned long virt, unsigned long size)
* Ensure that the active_mm is up to date - we want to
* catch any use-after-iounmap cases.
*/
if (current->active_mm->context.vmalloc_seq != init_mm.context.vmalloc_seq)
__check_vmalloc_seq(current->active_mm);
check_vmalloc_seq(current->active_mm);
flush_tlb_kernel_range(virt, end);
}

8
arch/arm/probes/kprobes/actions-common.c
View File

@ -84,7 +84,8 @@ emulate_generic_r0_12_noflags(probes_opcode_t insn,
register void *rfn asm("lr") = asi->insn_fn;
__asm__ __volatile__ (
"stmdb sp!, {%[regs], r11} \n\t"
ARM( "stmdb sp!, {%[regs], r11} \n\t" )
THUMB( "stmdb sp!, {%[regs], r7} \n\t" )
"ldmia %[regs], {r0-r12} \n\t"
#if __LINUX_ARM_ARCH__ >= 6
"blx %[fn] \n\t"
@ -96,10 +97,11 @@ emulate_generic_r0_12_noflags(probes_opcode_t insn,
#endif
"ldr lr, [sp], #4 \n\t" /* lr = regs */
"stmia lr, {r0-r12} \n\t"
"ldr r11, [sp], #4 \n\t"
ARM( "ldr r11, [sp], #4 \n\t" )
THUMB( "ldr r7, [sp], #4 \n\t" )
: [regs] "=r" (rregs), [fn] "=r" (rfn)
: "0" (rregs), "1" (rfn)
: "r0", "r2", "r3", "r4", "r5", "r6", "r7",
: "r0", "r2", "r3", "r4", "r5", "r6", ARM("r7") THUMB("r11"),
"r8", "r9", "r10", "r12", "memory", "cc"
);
}

16
arch/arm/probes/kprobes/actions-thumb.c
View File

@ -447,14 +447,16 @@ t16_emulate_loregs(probes_opcode_t insn,
__asm__ __volatile__ (
"msr cpsr_fs, %[oldcpsr] \n\t"
"mov r11, r7 \n\t"
"ldmia %[regs], {r0-r7} \n\t"
"blx %[fn] \n\t"
"stmia %[regs], {r0-r7} \n\t"
"mov r7, r11 \n\t"
"mrs %[newcpsr], cpsr \n\t"
: [newcpsr] "=r" (newcpsr)
: [oldcpsr] "r" (oldcpsr), [regs] "r" (regs),
[fn] "r" (asi->insn_fn)
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r11",
"lr", "memory", "cc"
);
@ -524,14 +526,16 @@ t16_emulate_push(probes_opcode_t insn,
struct arch_probes_insn *asi, struct pt_regs *regs)
{
__asm__ __volatile__ (
"mov r11, r7 \n\t"
"ldr r9, [%[regs], #13*4] \n\t"
"ldr r8, [%[regs], #14*4] \n\t"
"ldmia %[regs], {r0-r7} \n\t"
"blx %[fn] \n\t"
"str r9, [%[regs], #13*4] \n\t"
"mov r7, r11 \n\t"
:
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9",
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r8", "r9", "r11",
"lr", "memory", "cc"
);
}
@ -558,14 +562,16 @@ t16_emulate_pop_nopc(probes_opcode_t insn,
struct arch_probes_insn *asi, struct pt_regs *regs)
{
__asm__ __volatile__ (
"mov r11, r7 \n\t"
"ldr r9, [%[regs], #13*4] \n\t"
"ldmia %[regs], {r0-r7} \n\t"
"blx %[fn] \n\t"
"stmia %[regs], {r0-r7} \n\t"
"str r9, [%[regs], #13*4] \n\t"
"mov r7, r11 \n\t"
:
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r9", "r11",
"lr", "memory", "cc"
);
}
@ -577,14 +583,16 @@ t16_emulate_pop_pc(probes_opcode_t insn,
register unsigned long pc asm("r8");
__asm__ __volatile__ (
"mov r11, r7 \n\t"
"ldr r9, [%[regs], #13*4] \n\t"
"ldmia %[regs], {r0-r7} \n\t"
"blx %[fn] \n\t"
"stmia %[regs], {r0-r7} \n\t"
"str r9, [%[regs], #13*4] \n\t"
"mov r7, r11 \n\t"
: "=r" (pc)
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r9", "r11",
"lr", "memory", "cc"
);

22
drivers/irqchip/irq-nvic.c
View File

@ -37,27 +37,14 @@
static struct irq_domain *nvic_irq_domain;
static void __nvic_handle_irq(irq_hw_number_t hwirq)
static void __irq_entry nvic_handle_irq(struct pt_regs *regs)
{
unsigned long icsr = readl_relaxed(BASEADDR_V7M_SCB + V7M_SCB_ICSR);
irq_hw_number_t hwirq = (icsr & V7M_SCB_ICSR_VECTACTIVE) - 16;
generic_handle_domain_irq(nvic_irq_domain, hwirq);
}
/*
* TODO: restructure the ARMv7M entry logic so that this entry logic can live
* in arch code.
*/
asmlinkage void __exception_irq_entry
nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
{
struct pt_regs *old_regs;
irq_enter();
old_regs = set_irq_regs(regs);
__nvic_handle_irq(hwirq);
set_irq_regs(old_regs);
irq_exit();
}
static int nvic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
@ -143,6 +130,7 @@ static int __init nvic_of_init(struct device_node *node,
for (i = 0; i < irqs; i += 4)
writel_relaxed(0, nvic_base + NVIC_IPR + i);
set_handle_irq(nvic_handle_irq);
return 0;
}
IRQCHIP_DECLARE(armv7m_nvic, "arm,armv7m-nvic", nvic_of_init);