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Josh Poimboeuf c6cfcbd8ca x86/ibt: Convert IBT selftest to asm 
The following warning is reported when frame pointers and kernel IBT are
enabled:

  vmlinux.o: warning: objtool: ibt_selftest+0x11: sibling call from callable instruction with modified stack frame

The problem is that objtool interprets the indirect branch in
ibt_selftest() as a sibling call, and GCC inserts a (partial) frame
pointer prologue before it:

  0000 000000000003f550 <ibt_selftest>:
  0000    3f550:	f3 0f 1e fa          	endbr64
  0004    3f554:	e8 00 00 00 00       	call   3f559 <ibt_selftest+0x9>	3f555: R_X86_64_PLT32	__fentry__-0x4
  0009    3f559:	55                   	push   %rbp
  000a    3f55a:	48 8d 05 02 00 00 00 	lea    0x2(%rip),%rax        # 3f563 <ibt_selftest_ip>
  0011    3f561:	ff e0                	jmp    *%rax

Note the inline asm is missing ASM_CALL_CONSTRAINT, so the 'push %rbp'
happens before the indirect branch and the 'mov %rsp, %rbp' happens
afterwards.

Simplify the generated code and make it easier to understand for both
tools and humans by moving the selftest to proper asm.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/99a7e16b97bda97bf0a04aa141d6241cd8a839a2.1680912949.git.jpoimboe@kernel.org
2023-08-17 17:07:09 +02:00
..
acpi
- Address -Wmissing-prototype warnings
2023-06-26 16:43:54 -07:00
apic
Add UV platform support for sub-NUMA clustering
2023-06-26 16:26:44 -07:00
cpu
x86/ibt: Convert IBT selftest to asm
2023-08-17 17:07:09 +02:00
fpu
x86: Add PTRACE interface for shadow stack
2023-08-02 15:01:51 -07:00
kprobes
probes updates for 6.3:
2023-02-23 13:03:08 -08:00
.gitignore
…
alternative.c
Locking changes for v6.5:
2023-06-27 14:14:30 -07:00
amd_gart_64.c
x86/mm: Remove P*D_PAGE_MASK and P*D_PAGE_SIZE macros
2022-12-15 10:37:27 -08:00
amd_nb.c
x86/amd_nb: Re-sort and re-indent PCI defines
2023-06-05 12:26:54 +02:00
aperture_64.c
x86: Fix various duplicate-word comment typos
2022-08-15 19:17:52 +02:00
apm_32.c
efi: x86: Wire up IBT annotation in memory attributes table
2023-02-09 19:30:54 +01:00
asm-offsets_32.c
…
asm-offsets_64.c
x86: Fixup asm-offsets duplicate
2022-10-17 16:41:06 +02:00
asm-offsets.c
x86/smpboot: Remove initial_stack on 64-bit
2023-03-21 13:35:53 +01:00
audit_64.c
audit: add support for the openat2 syscall
2021-10-01 16:52:48 -04:00
bootflag.c
…
callthunks.c
objtool changes for v6.5:
2023-06-27 15:05:41 -07:00
cet.c
x86/ibt: Convert IBT selftest to asm
2023-08-17 17:07:09 +02:00
cfi.c
x86: Add support for CONFIG_CFI_CLANG
2022-09-26 10:13:16 -07:00
check.c
…
cpuid.c
driver core: class: remove module * from class_create()
2023-03-17 15:16:33 +01:00
crash_core_32.c
…
crash_core_64.c
…
crash_dump_32.c
vmcore: convert copy_oldmem_page() to take an iov_iter
2022-04-29 14:37:59 -07:00
crash_dump_64.c
use less confusing names for iov_iter direction initializers
2022-11-25 13:01:55 -05:00
crash.c
x86/crash: Disable virt in core NMI crash handler to avoid double shootdown
2023-01-24 10:05:21 -08:00
devicetree.c
x86/of: Add support for boot time interrupt delivery mode configuration
2022-12-02 14:57:14 +01:00
doublefault_32.c
x86: Avoid missing-prototype warnings for doublefault code
2023-05-18 11:56:18 -07:00
dumpstack_32.c
x86/percpu: Move irq_stack variables next to current_task
2022-10-17 16:41:05 +02:00
dumpstack_64.c
x86/percpu: Move irq_stack variables next to current_task
2022-10-17 16:41:05 +02:00
dumpstack.c
x86/show_trace_log_lvl: Ensure stack pointer is aligned, again
2023-05-16 06:31:04 -07:00
e820.c
x86/setup: Move duplicate boot_cpu_data definition out of the ifdeffery
2023-01-11 12:45:16 +01:00
early_printk.c
x86/earlyprintk: Clean up pciserial
2022-08-29 12:19:25 +02:00
early-quirks.c
drm/i915/rpl-p: Add PCI IDs
2022-04-19 17:14:09 -07:00
ebda.c
…
eisa.c
…
espfix_64.c
x86/espfix: Use get_random_long() rather than archrandom
2022-10-31 20:12:50 +01:00
ftrace_32.S
x86/ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL
2023-06-20 18:38:38 -04:00
ftrace_64.S
x86/ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL
2023-06-20 18:38:38 -04:00
ftrace.c
x86/ftrace: Move prepare_ftrace_return prototype to header
2023-05-18 11:56:01 -07:00
head32.c
x86: Add dummy prototype for mk_early_pgtbl_32()
2023-05-18 11:56:16 -07:00
head64.c
x86/head: Mark *_start_kernel() __noreturn
2023-04-14 17:31:24 +02:00
head_32.S
x86/smpboot: Restrict soft_restart_cpu() to SEV
2023-05-15 13:44:50 +02:00
head_64.S
A large update for SMP management:
2023-06-26 13:59:56 -07:00
hpet.c
clocksource: Verify HPET and PMTMR when TSC unverified
2023-02-02 14:23:02 -08:00
hw_breakpoint.c
x86/amd: Cache debug register values in percpu variables
2023-01-31 20:09:26 +01:00
i8237.c
…
i8253.c
…
i8259.c
x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL
2023-01-16 17:24:56 +01:00
ibt_selftest.S
x86/ibt: Convert IBT selftest to asm
2023-08-17 17:07:09 +02:00
idt.c
x86/shstk: Add user control-protection fault handler
2023-08-02 15:01:50 -07:00
io_delay.c
…
ioport.c
…
irq_32.c
x86/percpu: Move irq_stack variables next to current_task
2022-10-17 16:41:05 +02:00
irq_64.c
x86/percpu: Move irq_stack variables next to current_task
2022-10-17 16:41:05 +02:00
irq_work.c
…
irq.c
x86/irq: Add hardcoded hypervisor interrupts to /proc/stat
2023-06-08 08:28:08 -07:00
irqflags.S
x86: Prepare asm files for straight-line-speculation
2021-12-08 12:25:37 +01:00
irqinit.c
x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL
2023-01-16 17:24:56 +01:00
itmt.c
x86/sched/itmt: Give all SMT siblings of a core the same priority
2023-05-08 10:58:38 +02:00
jailhouse.c
…
jump_label.c
jump_label: make initial NOP patching the special case
2022-06-24 09:48:55 +02:00
kdebugfs.c
x86/boot: Fix memremap of setup_indirect structures
2022-03-09 12:49:44 +01:00
kexec-bzimage64.c
docs: move x86 documentation into Documentation/arch/
2023-03-30 12:58:51 -06:00
kgdb.c
…
ksysfs.c
x86/boot: Fix memremap of setup_indirect structures
2022-03-09 12:49:44 +01:00
kvm.c
ARM64:
2022-12-15 11:12:21 -08:00
kvmclock.c
x86/tsc: Provide sched_clock_noinstr()
2023-06-05 21:11:08 +02:00
ldt.c
x86: allow get_locked_pte() to fail
2023-06-19 16:19:10 -07:00
machine_kexec_32.c
…
machine_kexec_64.c
x86/kexec: remove unnecessary arch_kexec_kernel_image_load()
2023-04-08 13:45:38 -07:00
Makefile
x86/ibt: Convert IBT selftest to asm
2023-08-17 17:07:09 +02:00
mmconf-fam10h_64.c
…
module.c
module: replace module_layout with module_memory
2023-03-09 12:55:15 -08:00
mpparse.c
x86: Avoid magic number with ELCR register accesses
2021-08-10 23:31:43 +02:00
msr.c
driver core: class: remove module * from class_create()
2023-03-17 15:16:33 +01:00
nmi_selftest.c
…
nmi.c
locking/atomic: treewide: use raw_atomic*_<op>()
2023-06-05 09:57:20 +02:00
paravirt-spinlocks.c
…
paravirt.c
x86/paravirt: Convert simple paravirt functions to asm
2023-03-17 13:29:47 +01:00
pci-dma.c
docs: move x86 documentation into Documentation/arch/
2023-03-30 12:58:51 -06:00
pcspeaker.c
…
perf_regs.c
…
platform-quirks.c
x86/quirks: Include linux/pnp.h for arch_pnpbios_disabled()
2023-05-18 11:56:18 -07:00
pmem.c
x86/pmem: Fix platform-device leak in error path
2022-06-20 18:01:16 +02:00
probe_roms.c
x86/kernel: Validate ROM memory before accessing when SEV-SNP is active
2022-04-06 13:23:09 +02:00
process_32.c
x86/resctl: fix scheduler confusion with 'current'
2023-03-08 11:48:11 -08:00
process_64.c
x86/shstk: Add ARCH_SHSTK_STATUS
2023-08-02 15:01:51 -07:00
process.c
x86/shstk: Handle thread shadow stack
2023-08-02 15:01:50 -07:00
process.h
x86: Snapshot thread flags
2021-12-01 00:06:43 +01:00
ptrace.c
x86: Add PTRACE interface for shadow stack
2023-08-02 15:01:51 -07:00
pvclock.c
locking/atomic: treewide: use raw_atomic*_<op>()
2023-06-05 09:57:20 +02:00
quirks.c
…
reboot_fixups_32.c
…
reboot.c
cpu: Mark nmi_panic_self_stop() __noreturn
2023-04-14 17:31:26 +02:00
relocate_kernel_32.S
x86/kexec: Disable RET on kexec
2022-07-09 13:12:32 +02:00
relocate_kernel_64.S
x86,objtool: Split UNWIND_HINT_EMPTY in two
2023-03-23 23:18:58 +01:00
resource.c
x86/PCI: Tidy E820 removal messages
2022-12-10 10:33:11 -06:00
rethook.c
x86,rethook: Fix arch_rethook_trampoline() to generate a complete pt_regs
2022-03-28 19:38:51 -07:00
rtc.c
x86/rtc: Simplify PNP ids check
2023-01-06 04:22:34 +01:00
setup_percpu.c
- Add the call depth tracking mitigation for Retbleed which has
2022-12-14 15:03:00 -08:00
setup.c
xen: branch for v6.5-rc1
2023-06-27 16:03:20 -07:00
sev_verify_cbit.S
x86: Prepare asm files for straight-line-speculation
2021-12-08 12:25:37 +01:00
sev-shared.c
x86/sev: Add SNP-specific unaccepted memory support
2023-06-06 18:31:37 +02:00
sev.c
- Some SEV and CC platform helpers cleanup and simplifications now that
2023-06-27 13:26:30 -07:00
shstk.c
x86/shstk: Don't retry vm_munmap() on -EINTR
2023-08-02 15:01:51 -07:00
signal_32.c
x86/shstk: Add user control-protection fault handler
2023-08-02 15:01:50 -07:00
signal_64.c
x86/shstk: Handle signals for shadow stack
2023-08-02 15:01:50 -07:00
signal.c
x86/shstk: Handle signals for shadow stack
2023-08-02 15:01:50 -07:00
smp.c
A set of fixes for kexec(), reboot and shutdown issues
2023-06-26 14:45:53 -07:00
smpboot.c
A single fix for the mechanism to park CPUs with an INIT IPI.
2023-07-09 10:08:38 -07:00
stacktrace.c
x86: remove __range_not_ok()
2022-02-25 09:36:05 +01:00
static_call.c
x86/static_call: Add support for Jcc tail-calls
2023-01-31 15:05:31 +01:00
step.c
ptrace: Reimplement PTRACE_KILL by always sending SIGKILL
2022-05-11 14:34:28 -05:00
sys_ia32.c
…
sys_x86_64.c
x86/mm: Introduce MAP_ABOVE4G
2023-07-11 14:12:19 -07:00
tboot.c
mm: remove rb tree.
2022-09-26 19:46:16 -07:00
time.c
…
tls.c
x86/gsseg: Move load_gs_index() to its own new header file
2023-01-12 13:06:36 +01:00
tls.h
…
topology.c
x86/topology: Remove CPU0 hotplug option
2023-05-15 13:44:49 +02:00
trace_clock.c
…
trace.c
trace/osnoise: Fix an ifdef comment
2021-10-25 23:02:36 -04:00
tracepoint.c
x86/traceponit: Fix comment about irq vector tracepoints
2022-05-26 22:03:52 -04:00
traps.c
x86/shstk: Add user control-protection fault handler
2023-08-02 15:01:50 -07:00
tsc_msr.c
…
tsc_sync.c
x86/smpboot: Make TSC synchronization function call based
2023-05-15 13:44:53 +02:00
tsc.c
Scheduler changes for v6.5:
2023-06-27 14:03:21 -07:00
umip.c
x86/umip: Downgrade warning messages to debug loglevel
2021-09-25 13:23:28 +02:00
unwind_frame.c
x86: kmsan: don't instrument stack walking functions
2022-10-03 14:03:25 -07:00
unwind_guess.c
x86/unwind: Recover kretprobe trampoline entry
2021-09-30 21:24:07 -04:00
unwind_orc.c
objtool changes for v6.5:
2023-06-27 15:05:41 -07:00
uprobes.c
uprobes/x86: Allow to probe a NOP instruction with 0x66 prefix
2022-12-05 11:55:18 +01:00
verify_cpu.S
x86: Prepare asm files for straight-line-speculation
2021-12-08 12:25:37 +01:00
vm86_32.c
x86/32: Remove lazy GS macros
2022-04-14 14:09:43 +02:00
vmlinux.lds.S
x86/retbleed: Add __x86_return_thunk alignment checks
2023-05-17 12:14:21 +02:00
vsmp_64.c
…
x86_init.c
- Fix a race window where load_unaligned_zeropad() could cause
2023-06-26 16:32:47 -07:00