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| author | Mao Han | 2019-04-10 04:27:10 +0200 |
|---|---|---|
| committer | Guo Ren | 2019-04-22 07:44:57 +0200 |
| commit | b4bf274198bd415e66af0b54a2e181c59fd43ba4 (patch) | |
| tree | f517e4c2a1d0b8636e24089188a1fcf0826cf5f1 /arch/csky | |
| parent | csky: Fixup wrong update_mmu_cache implementation (diff) | |
| download | kernel-qcow2-linux-b4bf274198bd415e66af0b54a2e181c59fd43ba4.tar.gz kernel-qcow2-linux-b4bf274198bd415e66af0b54a2e181c59fd43ba4.tar.xz kernel-qcow2-linux-b4bf274198bd415e66af0b54a2e181c59fd43ba4.zip | |
csky: Add perf_arch_fetch_caller_regs support
In trace events as tracepoints context are not able to
be retrieve with task_pt_regs. Without arch caller regs
support the pt_regs context will be all zero, perf can
not parsing the callchain and resolving the symbols
correctly, some time will even get into deadlock
while handling the page fault, eg:
perf kmem —page record ls
Changelog
- Add test case cmd in comment
- Use regs_fp(regs) which is defined in abi/regdef.h
Signed-off-by: Mao Han <han_mao@c-sky.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Diffstat (limited to 'arch/csky')
| -rw-r--r-- | arch/csky/abiv1/inc/abi/regdef.h | 1 | ||||
| -rw-r--r-- | arch/csky/abiv2/inc/abi/regdef.h | 1 | ||||
| -rw-r--r-- | arch/csky/include/asm/perf_event.h | 8 |
3 files changed, 10 insertions, 0 deletions
diff --git a/arch/csky/abiv1/inc/abi/regdef.h b/arch/csky/abiv1/inc/abi/regdef.h index 729b1c3edcfd..104707fbdcc1 100644 --- a/arch/csky/abiv1/inc/abi/regdef.h +++ b/arch/csky/abiv1/inc/abi/regdef.h @@ -6,6 +6,7 @@ #define syscallid r1 #define regs_syscallid(regs) regs->regs[9] +#define regs_fp(regs) regs->regs[2] /* * PSR format: diff --git a/arch/csky/abiv2/inc/abi/regdef.h b/arch/csky/abiv2/inc/abi/regdef.h index 77cb1788b04c..d7328bbc1ce7 100644 --- a/arch/csky/abiv2/inc/abi/regdef.h +++ b/arch/csky/abiv2/inc/abi/regdef.h @@ -6,6 +6,7 @@ #define syscallid r7 #define regs_syscallid(regs) regs->regs[3] +#define regs_fp(regs) regs->regs[4] /* * PSR format: diff --git a/arch/csky/include/asm/perf_event.h b/arch/csky/include/asm/perf_event.h index ea8193122294..572093e11001 100644 --- a/arch/csky/include/asm/perf_event.h +++ b/arch/csky/include/asm/perf_event.h @@ -4,4 +4,12 @@ #ifndef __ASM_CSKY_PERF_EVENT_H #define __ASM_CSKY_PERF_EVENT_H +#include <abi/regdef.h> + +#define perf_arch_fetch_caller_regs(regs, __ip) { \ + (regs)->pc = (__ip); \ + regs_fp(regs) = (unsigned long) __builtin_frame_address(0); \ + asm volatile("mov %0, sp\n":"=r"((regs)->usp)); \ +} + #endif /* __ASM_PERF_EVENT_ELF_H */ |