diff options
| author | Guo Ren <ren_guo@c-sky.com> | 2019-03-01 01:50:36 +0100 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2019-04-22 07:44:57 +0200 |
| commit | 28bb030f93334495ddc64ade0bff18721bf7023d (patch) | |
| tree | d0a4e4eaa36575adf490165f63d2bd6160653124 /arch/csky/include | |
| parent | csky: Fixup vdsp&fpu issues in kernel (diff) | |
| download | linux-28bb030f93334495ddc64ade0bff18721bf7023d.tar.xz linux-28bb030f93334495ddc64ade0bff18721bf7023d.zip | |
csky/ftrace: Add dynamic function tracer (include graph tracer)
Support dynamic ftrace including dynamic graph tracer. Gcc-csky with -pg
will produce call site in every function prologue and we can use these
call site to hook trace function.
gcc with -pg origin call site:
push lr
jbsr _mcount
nop32
nop32
If the (callee - caller)'s offset is in range of bsr instruction, we'll
modify code with:
push lr
bsr _mcount
nop32
nop32
Else if the (callee - caller)'s offset is out of bsr instrunction, we'll
modify code with:
push lr
movih r26, ...
ori r26, ...
jsr r26
(r26 is reserved for jsr link reg in csky abiv2 spec.)
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Diffstat (limited to 'arch/csky/include')
| -rw-r--r-- | arch/csky/include/asm/ftrace.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/arch/csky/include/asm/ftrace.h b/arch/csky/include/asm/ftrace.h index 7547c45312a8..ba35d93ecda2 100644 --- a/arch/csky/include/asm/ftrace.h +++ b/arch/csky/include/asm/ftrace.h @@ -4,10 +4,26 @@ #ifndef __ASM_CSKY_FTRACE_H #define __ASM_CSKY_FTRACE_H -#define MCOUNT_INSN_SIZE 4 +#define MCOUNT_INSN_SIZE 14 #define HAVE_FUNCTION_GRAPH_FP_TEST #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR +#define MCOUNT_ADDR ((unsigned long)_mcount) + +#ifndef __ASSEMBLY__ + +extern void _mcount(unsigned long); + +extern void ftrace_graph_call(void); + +static inline unsigned long ftrace_call_adjust(unsigned long addr) +{ + return addr; +} + +struct dyn_arch_ftrace { +}; +#endif /* !__ASSEMBLY__ */ #endif /* __ASM_CSKY_FTRACE_H */ |