csky: Add perf_arch_fetch_caller_regs support (b4bf2741) · Commits · 戴 / test

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>

arch/csky/abiv1/inc/abi/regdef.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@

		#define syscallid r1
		#define regs_syscallid(regs) regs->regs[9]
		#define regs_fp(regs) regs->regs[2]

		/*
		* PSR format:

arch/csky/abiv2/inc/abi/regdef.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@

		#define syscallid r7
		#define regs_syscallid(regs) regs->regs[3]
		#define regs_fp(regs) regs->regs[4]

		/*
		* PSR format:

arch/csky/include/asm/perf_event.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -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 */

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