diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/ftrace.h | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/entry-ftrace.S | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/ftrace.c | 5 |
3 files changed, 8 insertions, 1 deletions
diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h index a4dbac07e4ef..b4f5fab6b04e 100644 --- a/arch/arm/include/asm/ftrace.h +++ b/arch/arm/include/asm/ftrace.h @@ -2,6 +2,8 @@ #ifndef _ASM_ARM_FTRACE #define _ASM_ARM_FTRACE +#define HAVE_FUNCTION_GRAPH_FP_TEST + #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS #define ARCH_SUPPORTS_FTRACE_OPS 1 #endif diff --git a/arch/arm/kernel/entry-ftrace.S b/arch/arm/kernel/entry-ftrace.S index 99720064a4c5..bbfa0954c385 100644 --- a/arch/arm/kernel/entry-ftrace.S +++ b/arch/arm/kernel/entry-ftrace.S @@ -247,7 +247,7 @@ ENDPROC(ftrace_graph_regs_caller) .globl return_to_handler return_to_handler: stmdb sp!, {r0-r3} - mov r0, fp @ frame pointer + add r0, sp, #16 @ sp at exit of instrumented routine bl ftrace_return_to_handler mov lr, r0 @ r0 has real ret addr ldmia sp!, {r0-r3} diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c index 74d3913f5590..ea2396900c7d 100644 --- a/arch/arm/kernel/ftrace.c +++ b/arch/arm/kernel/ftrace.c @@ -233,6 +233,11 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, if (unlikely(atomic_read(¤t->tracing_graph_pause))) return; + if (IS_ENABLED(CONFIG_UNWINDER_FRAME_POINTER)) { + /* FP points one word below parent's top of stack */ + frame_pointer += 4; + } + old = *parent; *parent = return_hooker; |