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39ef362d2d
linux/arch/arm64/kernel
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Madhavan T. Venkataraman 39ef362d2d arm64: Make return_address() use arch_stack_walk() 
To enable RELIABLE_STACKTRACE and LIVEPATCH on arm64, we need to
substantially rework arm64's unwinding code. As part of this, we want to
minimize the set of unwind interfaces we expose, and avoid open-coding
of unwind logic outside of stacktrace.c.

Currently return_address() walks the stack of the current task by
calling start_backtrace() with return_address as the PC and the frame
pointer of return_address() as the next frame, iterating unwind steps
using walk_stackframe(). This is functionally equivalent to calling
arch_stack_walk() for the current stack, which will start from its
caller (i.e. return_address()) as the PC and it's caller's frame record
as the next frame.

Make return_address() use arch_stackwalk(). This simplifies
return_address(), and in future will alow us to make walk_stackframe()
private to stacktrace.c.

There should be no functional change as a result of this patch.

Signed-off-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
[Mark: elaborate commit message, fix includes]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20211129142849.3056714-7-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2021-12-10 14:06:04 +00:00
..
probes arm64: kprobes: Make a frame pointer on __kretprobe_trampoline 2021-10-22 12:16:53 -04:00
vdso arm64: vdso: remove -nostdlib compiler flag 2021-11-08 10:02:57 +00:00
vdso32 arm64: vdso: remove -nostdlib compiler flag 2021-11-08 10:02:57 +00:00
.gitignore
acpi_numa.c arm64, numa: Change the numa init functions name to be generic 2021-01-14 15:08:54 -08:00
acpi_parking_protocol.c arm64: use function_nocfi with __pa_symbol 2021-04-08 16:04:22 -07:00
acpi.c Revert "ACPI: Add memory semantics to acpi_os_map_memory()" 2021-09-23 20:39:36 +02:00
alternative.c arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
armv8_deprecated.c arm64: extable: add a dedicated uaccess handler 2021-10-21 10:45:22 +01:00
asm-offsets.c cpu-to-thread_info update for v5.16-rc1 2021-11-01 17:00:05 -07:00
cacheinfo.c drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
cpu_errata.c arm64: errata: Add detection for TRBE write to out-of-range 2021-10-21 17:49:17 +01:00
cpu_ops.c
cpu-reset.S arm64: kexec: remove cpu-reset.h 2021-10-01 13:31:00 +01:00
cpufeature.c Char/Misc fix for 5.16-rc1 2021-11-11 09:44:29 -08:00
cpuidle.c arm64: kernel: Update the stale comment 2021-05-06 12:26:26 +01:00
cpuinfo.c arm64: Add HWCAP for self-synchronising virtual counter 2021-10-19 10:56:20 +01:00
crash_core.c
crash_dump.c arm64: kdump: update ppos when reading elfcorehdr 2021-03-22 12:46:38 +00:00
debug-monitors.c arm64: expose FAR_EL1 tag bits in siginfo 2020-11-23 18:17:39 +00:00
efi-entry.S arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
efi-header.S
efi-rt-wrapper.S
efi.c arm64: efi: Export screen_info 2021-08-04 16:54:36 +00:00
entry-common.c irq: arm64: perform irqentry in entry code 2021-10-26 10:12:53 +01:00
entry-fpsimd.S arm64/sve: Explicitly load vector length when restoring SVE state 2021-10-21 10:18:17 +01:00
entry-ftrace.S arm64: rename S_FRAME_SIZE to PT_REGS_SIZE 2021-01-13 15:09:06 +00:00
entry.S arm64: kasan: mte: move GCR_EL1 switch to task switch when KASAN disabled 2021-09-29 17:18:57 +01:00
fpsimd.c arm64/sve: Fix warnings when SVE is disabled 2021-10-26 10:15:46 +01:00
ftrace.c arm64: ftrace: use HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 2021-11-16 09:47:54 +00:00
head.S sched: move CPU field back into thread_info if THREAD_INFO_IN_TASK=y 2021-09-30 16:13:10 +02:00
hibernate-asm.S arm64: kexec: install a copy of the linear-map 2021-10-01 13:31:00 +01:00
hibernate.c arm64: hibernate: abstract ttrb0 setup function 2021-10-01 13:30:59 +01:00
hw_breakpoint.c
hyp-stub.S Merge remote-tracking branch 'arm64/for-next/vhe-only' into kvmarm-master/next 2021-04-13 15:42:40 +01:00
idle.c Merge branch 'for-next/entry' into for-next/core 2021-06-24 14:01:55 +01:00
idreg-override.c arm64/cpufeature: Optionally disable MTE via command-line 2021-08-03 15:48:01 +01:00
image-vars.h arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
image.h
io.c
irq.c arm64: irq: allow FIQs to be handled 2021-03-24 20:19:30 +00:00
jump_label.c arm64: insn: decouple patching from insn code 2021-06-11 11:19:27 +01:00
kaslr.c arm64: fix the doc of RANDOMIZE_MODULE_REGION_FULL 2021-08-03 10:36:42 +01:00
kexec_image.c
kgdb.c arm64: insn: decouple patching from insn code 2021-06-11 11:19:27 +01:00
kuser32.S
machine_kexec_file.c arm64: Use common of_kexec_alloc_and_setup_fdt() 2021-03-08 12:06:29 -07:00
machine_kexec.c arm64: kexec: remove cpu-reset.h 2021-10-01 13:31:00 +01:00
Makefile kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
module-plts.c arm64: improve whitespace 2021-02-04 13:59:49 +00:00
module.c arm64: kaslr: support randomized module area with KASAN_VMALLOC 2021-03-29 12:35:05 +01:00
mte.c arm64: mte: Add asymmetric mode support 2021-10-07 09:30:24 +01:00
paravirt.c x86/paravirt: Switch time pvops functions to use static_call() 2021-03-11 16:17:52 +01:00
patching.c Merge branch 'for-next/insn' into for-next/core 2021-06-24 14:03:24 +01:00
pci.c arm64: PCI: Support root bridge preparation for Hyper-V 2021-08-23 10:59:26 +01:00
perf_callchain.c arm64: Make perf_callchain_kernel() use arch_stack_walk() 2021-12-10 14:06:03 +00:00
perf_event.c arm64/perf: Replace '0xf' instances with ID_AA64DFR0_PMUVER_IMP_DEF 2021-08-11 11:02:12 +01:00
perf_regs.c
pointer_auth.c arm64: move preemption disablement to prctl handlers 2021-07-28 18:33:49 +01:00
process.c arm64: Make __get_wchan() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
proton-pack.c Merge remote-tracking branch 'arm64/for-next/fixes' into for-next/core 2020-12-09 18:04:55 +00:00
psci.c arm64: use function_nocfi with __pa_symbol 2021-04-08 16:04:22 -07:00
ptrace.c arm64/sve: Put system wide vector length information into structs 2021-10-21 10:18:17 +01:00
reloc_test_core.c
reloc_test_syms.S
relocate_kernel.S arm64: kexec: keep MMU enabled during kexec relocation 2021-10-01 13:31:00 +01:00
return_address.c arm64: Make return_address() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
sdei.c arm64: kernel: add helper for booted at EL2 and not VHE 2021-10-01 13:30:59 +01:00
setup.c arm64: convert to setup_initial_init_mm() 2021-07-08 11:48:21 -07:00
signal.c arm64/sve: Put system wide vector length information into structs 2021-10-21 10:18:17 +01:00
signal32.c arm64 updates for 5.15: 2021-09-01 15:04:29 -07:00
sigreturn32.S
sleep.S kasan: remove redundant config option 2021-04-16 16:10:36 -07:00
smccc-call.S arm64: smccc: Save lr before calling __arm_smccc_sve_check() 2021-07-21 11:23:25 +01:00
smp_spin_table.c arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
smp.c Devicetree updates for v5.16: 2021-11-02 22:22:13 -07:00
stacktrace.c arch: Make ARCH_STACKWALK independent of STACKTRACE 2021-12-10 14:06:03 +00:00
suspend.c arm64: kasan: mte: use a constant kernel GCR_EL1 value 2021-08-02 18:14:21 +01:00
sys_compat.c arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
sys.c
sys32.c
syscall.c arm64: fix compat syscall return truncation 2021-08-03 10:35:03 +01:00
time.c
topology.c topology: Represent clusters of CPUs within a die 2021-10-15 11:25:15 +02:00
trace-events-emulation.h
traps.c Merge branch 'for-next/misc' into for-next/core 2021-10-29 12:24:59 +01:00
vdso-wrap.S arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00
vdso.c Merge branches 'for-next/misc', 'for-next/kselftest', 'for-next/xntable', 'for-next/vdso', 'for-next/fiq', 'for-next/epan', 'for-next/kasan-vmalloc', 'for-next/fgt-boot-init', 'for-next/vhe-only' and 'for-next/neon-softirqs-disabled', remote-tracking branch 'arm64/for-next/perf' into for-next/core 2021-04-15 14:00:38 +01:00
vdso32-wrap.S arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00
vmlinux.lds.S Merge branch 'for-next/kexec' into for-next/core 2021-10-29 12:24:47 +01:00