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| author | Abhishek Sagar <sagar.abhishek@gmail.com> | 2008-05-31 14:23:50 +0530 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-02 11:32:20 +0200 |
| commit | 014c257cce65e9d1cd2d28ec1c89a37c536b151d (patch) | |
| tree | c7a28fbf6f295538964539d5b8c552ea786f7072 /arch/arm/kernel/entry-common.S | |
| parent | b1829d2705daa7cb72eb1e08bdc8b7e9fad34266 (diff) | |
| download | linux-014c257cce65e9d1cd2d28ec1c89a37c536b151d.tar.gz linux-014c257cce65e9d1cd2d28ec1c89a37c536b151d.tar.xz linux-014c257cce65e9d1cd2d28ec1c89a37c536b151d.zip | |
ftrace: core support for ARM
Core ftrace support for the ARM architecture, which includes support
for dynamic function tracing.
Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/arm/kernel/entry-common.S')
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 597ed00a08d8..8f79a4789ed4 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -99,6 +99,53 @@ ENTRY(ret_from_fork) #undef CALL #define CALL(x) .long x +#ifdef CONFIG_FTRACE +#ifdef CONFIG_DYNAMIC_FTRACE +ENTRY(mcount) + stmdb sp!, {r0-r3, lr} + mov r0, lr + + .globl mcount_call +mcount_call: + bl ftrace_stub + ldmia sp!, {r0-r3, pc} + +ENTRY(ftrace_caller) + stmdb sp!, {r0-r3, lr} + ldr r1, [fp, #-4] + mov r0, lr + + .globl ftrace_call +ftrace_call: + bl ftrace_stub + ldmia sp!, {r0-r3, pc} + +#else + +ENTRY(mcount) + stmdb sp!, {r0-r3, lr} + ldr r0, =ftrace_trace_function + ldr r2, [r0] + adr r0, ftrace_stub + cmp r0, r2 + bne trace + ldmia sp!, {r0-r3, pc} + +trace: + ldr r1, [fp, #-4] + mov r0, lr + mov lr, pc + mov pc, r2 + ldmia sp!, {r0-r3, pc} + +#endif /* CONFIG_DYNAMIC_FTRACE */ + + .globl ftrace_stub +ftrace_stub: + mov pc, lr + +#endif /* CONFIG_FTRACE */ + /*============================================================================= * SWI handler *----------------------------------------------------------------------------- |