From: Mao Han <han_mao@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Guo Ren <guoren@xxxxxxxxxx>
---
arch/csky/abiv1/inc/abi/regdef.h | 1 +
arch/csky/abiv2/inc/abi/regdef.h | 1 +
arch/csky/include/asm/perf_event.h | 8 ++++++++
3 files changed, 10 insertions(+)
diff --git a/arch/csky/abiv1/inc/abi/regdef.h b/arch/csky/abiv1/inc/abi/regdef.h
index 729b1c3..104707f 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 77cb178..d7328bb 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 ea81931..572093e 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 */
--
2.7.4
