ecbba30fbf
Many architectures duplicate similar shell scripts. This commit converts mips to use scripts/syscalltbl.sh. This also unifies syscall_table_32_o32.h and syscall_table_64_o32.h into syscall_table_o32.h. The offset parameters are unneeded here; __SYSCALL(nr, entry) is defined as 'PTR entry', so the parameter 'nr' is not used in the first place. With this commit, syscall tables and generated files are straight mapped, which makes things easier to understand. syscall_n32.tbl --> syscall_table_n32.h syscall_n64.tbl --> syscall_table_n64.h syscall_o32.tbl --> syscall_table_o32.h Then, the abi parameters are also unneeded. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
226 lines
5.1 KiB
ArmAsm
226 lines
5.1 KiB
ArmAsm
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
|
|
* Copyright (C) 2001 MIPS Technologies, Inc.
|
|
* Copyright (C) 2004 Thiemo Seufer
|
|
* Copyright (C) 2014 Imagination Technologies Ltd.
|
|
*/
|
|
#include <linux/errno.h>
|
|
#include <asm/asm.h>
|
|
#include <asm/asmmacro.h>
|
|
#include <asm/irqflags.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/regdef.h>
|
|
#include <asm/stackframe.h>
|
|
#include <asm/isadep.h>
|
|
#include <asm/sysmips.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/unistd.h>
|
|
#include <asm/war.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
.align 5
|
|
NESTED(handle_sys, PT_SIZE, sp)
|
|
.set noat
|
|
SAVE_SOME
|
|
TRACE_IRQS_ON_RELOAD
|
|
STI
|
|
.set at
|
|
|
|
lw t1, PT_EPC(sp) # skip syscall on return
|
|
|
|
addiu t1, 4 # skip to next instruction
|
|
sw t1, PT_EPC(sp)
|
|
|
|
sw a3, PT_R26(sp) # save a3 for syscall restarting
|
|
|
|
/*
|
|
* More than four arguments. Try to deal with it by copying the
|
|
* stack arguments from the user stack to the kernel stack.
|
|
* This Sucks (TM).
|
|
*/
|
|
lw t0, PT_R29(sp) # get old user stack pointer
|
|
|
|
/*
|
|
* We intentionally keep the kernel stack a little below the top of
|
|
* userspace so we don't have to do a slower byte accurate check here.
|
|
*/
|
|
lw t5, TI_ADDR_LIMIT($28)
|
|
addu t4, t0, 32
|
|
and t5, t4
|
|
bltz t5, bad_stack # -> sp is bad
|
|
|
|
/*
|
|
* Ok, copy the args from the luser stack to the kernel stack.
|
|
*/
|
|
|
|
.set push
|
|
.set noreorder
|
|
.set nomacro
|
|
|
|
load_a4: user_lw(t5, 16(t0)) # argument #5 from usp
|
|
load_a5: user_lw(t6, 20(t0)) # argument #6 from usp
|
|
load_a6: user_lw(t7, 24(t0)) # argument #7 from usp
|
|
load_a7: user_lw(t8, 28(t0)) # argument #8 from usp
|
|
loads_done:
|
|
|
|
sw t5, 16(sp) # argument #5 to ksp
|
|
sw t6, 20(sp) # argument #6 to ksp
|
|
sw t7, 24(sp) # argument #7 to ksp
|
|
sw t8, 28(sp) # argument #8 to ksp
|
|
.set pop
|
|
|
|
.section __ex_table,"a"
|
|
PTR load_a4, bad_stack_a4
|
|
PTR load_a5, bad_stack_a5
|
|
PTR load_a6, bad_stack_a6
|
|
PTR load_a7, bad_stack_a7
|
|
.previous
|
|
|
|
lw t0, TI_FLAGS($28) # syscall tracing enabled?
|
|
li t1, _TIF_WORK_SYSCALL_ENTRY
|
|
and t0, t1
|
|
bnez t0, syscall_trace_entry # -> yes
|
|
syscall_common:
|
|
subu v0, v0, __NR_O32_Linux # check syscall number
|
|
sltiu t0, v0, __NR_O32_Linux_syscalls
|
|
beqz t0, illegal_syscall
|
|
|
|
sll t0, v0, 2
|
|
la t1, sys_call_table
|
|
addu t1, t0
|
|
lw t2, (t1) # syscall routine
|
|
|
|
beqz t2, illegal_syscall
|
|
|
|
jalr t2 # Do The Real Thing (TM)
|
|
|
|
li t0, -EMAXERRNO - 1 # error?
|
|
sltu t0, t0, v0
|
|
sw t0, PT_R7(sp) # set error flag
|
|
beqz t0, 1f
|
|
|
|
lw t1, PT_R2(sp) # syscall number
|
|
negu v0 # error
|
|
sw t1, PT_R0(sp) # save it for syscall restarting
|
|
1: sw v0, PT_R2(sp) # result
|
|
|
|
o32_syscall_exit:
|
|
j syscall_exit_partial
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
syscall_trace_entry:
|
|
SAVE_STATIC
|
|
move a0, sp
|
|
|
|
/*
|
|
* syscall number is in v0 unless we called syscall(__NR_###)
|
|
* where the real syscall number is in a0
|
|
*/
|
|
move a1, v0
|
|
subu t2, v0, __NR_O32_Linux
|
|
bnez t2, 1f /* __NR_syscall at offset 0 */
|
|
lw a1, PT_R4(sp)
|
|
|
|
1: jal syscall_trace_enter
|
|
|
|
bltz v0, 1f # seccomp failed? Skip syscall
|
|
|
|
RESTORE_STATIC
|
|
lw v0, PT_R2(sp) # Restore syscall (maybe modified)
|
|
lw a0, PT_R4(sp) # Restore argument registers
|
|
lw a1, PT_R5(sp)
|
|
lw a2, PT_R6(sp)
|
|
lw a3, PT_R7(sp)
|
|
j syscall_common
|
|
|
|
1: j syscall_exit
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
/*
|
|
* Our open-coded access area sanity test for the stack pointer
|
|
* failed. We probably should handle this case a bit more drastic.
|
|
*/
|
|
bad_stack:
|
|
li v0, EFAULT
|
|
sw v0, PT_R2(sp)
|
|
li t0, 1 # set error flag
|
|
sw t0, PT_R7(sp)
|
|
j o32_syscall_exit
|
|
|
|
bad_stack_a4:
|
|
li t5, 0
|
|
b load_a5
|
|
|
|
bad_stack_a5:
|
|
li t6, 0
|
|
b load_a6
|
|
|
|
bad_stack_a6:
|
|
li t7, 0
|
|
b load_a7
|
|
|
|
bad_stack_a7:
|
|
li t8, 0
|
|
b loads_done
|
|
|
|
/*
|
|
* The system call does not exist in this kernel
|
|
*/
|
|
illegal_syscall:
|
|
li v0, ENOSYS # error
|
|
sw v0, PT_R2(sp)
|
|
li t0, 1 # set error flag
|
|
sw t0, PT_R7(sp)
|
|
j o32_syscall_exit
|
|
END(handle_sys)
|
|
|
|
LEAF(sys_syscall)
|
|
subu t0, a0, __NR_O32_Linux # check syscall number
|
|
sltiu v0, t0, __NR_O32_Linux_syscalls
|
|
beqz t0, einval # do not recurse
|
|
sll t1, t0, 2
|
|
beqz v0, einval
|
|
lw t2, sys_call_table(t1) # syscall routine
|
|
|
|
move a0, a1 # shift argument registers
|
|
move a1, a2
|
|
move a2, a3
|
|
lw a3, 16(sp)
|
|
lw t4, 20(sp)
|
|
lw t5, 24(sp)
|
|
lw t6, 28(sp)
|
|
sw t4, 16(sp)
|
|
sw t5, 20(sp)
|
|
sw t6, 24(sp)
|
|
jr t2
|
|
/* Unreached */
|
|
|
|
einval: li v0, -ENOSYS
|
|
jr ra
|
|
END(sys_syscall)
|
|
|
|
#ifdef CONFIG_MIPS_MT_FPAFF
|
|
/*
|
|
* For FPU affinity scheduling on MIPS MT processors, we need to
|
|
* intercept sys_sched_xxxaffinity() calls until we get a proper hook
|
|
* in kernel/sched/core.c. Considered only temporary we only support
|
|
* these hooks for the 32-bit kernel - there is no MIPS64 MT processor
|
|
* atm.
|
|
*/
|
|
#define sys_sched_setaffinity mipsmt_sys_sched_setaffinity
|
|
#define sys_sched_getaffinity mipsmt_sys_sched_getaffinity
|
|
#endif /* CONFIG_MIPS_MT_FPAFF */
|
|
|
|
#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native)
|
|
#define __SYSCALL(nr, entry) PTR entry
|
|
.align 2
|
|
.type sys_call_table, @object
|
|
EXPORT(sys_call_table)
|
|
#include <asm/syscall_table_o32.h>
|