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MIPS: Tracing: Make ftrace for MIPS work without -fno-omit-frame-pointer

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When remove the -fno-omit-frame-pointer, gcc will not save the frame
pointer for us, we need to save one ourselves.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Nicholas Mc Guire <der.herr@hofr.at>
Cc: zhangfx@lemote.com
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/679/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin
2009-11-20 20:34:36 +08:00
committed by Ralf Baechle
parent e17ff5fec6
commit 046199cae7
3 changed files with 106 additions and 15 deletions
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57
arch/mips/include/asm/ftrace.h
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@@ -19,6 +19,62 @@
extern void _mcount(void);
#define mcount _mcount
#define safe_load(load, src, dst, error) \
do { \
asm volatile ( \
"1: " load " %[" STR(dst) "], 0(%[" STR(src) "])\n"\
" li %[" STR(error) "], 0\n" \
"2:\n" \
\
".section .fixup, \"ax\"\n" \
"3: li %[" STR(error) "], 1\n" \
" j 2b\n" \
".previous\n" \
\
".section\t__ex_table,\"a\"\n\t" \
STR(PTR) "\t1b, 3b\n\t" \
".previous\n" \
\
: [dst] "=&r" (dst), [error] "=r" (error)\
: [src] "r" (src) \
: "memory" \
); \
} while (0)
#define safe_store(store, src, dst, error) \
do { \
asm volatile ( \
"1: " store " %[" STR(src) "], 0(%[" STR(dst) "])\n"\
" li %[" STR(error) "], 0\n" \
"2:\n" \
\
".section .fixup, \"ax\"\n" \
"3: li %[" STR(error) "], 1\n" \
" j 2b\n" \
".previous\n" \
\
".section\t__ex_table,\"a\"\n\t"\
STR(PTR) "\t1b, 3b\n\t" \
".previous\n" \
\
: [error] "=r" (error) \
: [dst] "r" (dst), [src] "r" (src)\
: "memory" \
); \
} while (0)
#define safe_load_code(dst, src, error) \
safe_load(STR(lw), src, dst, error)
#define safe_store_code(src, dst, error) \
safe_store(STR(sw), src, dst, error)
#define safe_load_stack(dst, src, error) \
safe_load(STR(PTR_L), src, dst, error)
#define safe_store_stack(src, dst, error) \
safe_store(STR(PTR_S), src, dst, error)
#ifdef CONFIG_DYNAMIC_FTRACE
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
@@ -27,6 +83,7 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
struct dyn_arch_ftrace {
};
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */