diff options
| author | Guo Ren <guoren@linux.alibaba.com> | 2020-02-18 15:27:39 +0300 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2020-03-08 15:55:14 +0300 |
| commit | 89a3927a775c0a7212e2e3c4e2d42cd48895bee0 (patch) | |
| tree | 18dc3f0f5c95f004f7613882a511eb7e19b32ba6 /arch/csky/kernel | |
| parent | 9866d141a0977ace974400bf1f793dfc163409ce (diff) | |
| download | linux-89a3927a775c0a7212e2e3c4e2d42cd48895bee0.tar.xz | |
csky: Implement ftrace with regs
This patch implements FTRACE_WITH_REGS for csky, which allows a traced
function's arguments (and some other registers) to be captured into a
struct pt_regs, allowing these to be inspected and/or modified.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Diffstat (limited to 'arch/csky/kernel')
| -rw-r--r-- | arch/csky/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/csky/kernel/ftrace.c | 11 |
2 files changed, 12 insertions, 0 deletions
diff --git a/arch/csky/kernel/asm-offsets.c b/arch/csky/kernel/asm-offsets.c index 9b48b1b1a61b..f8be348df9e4 100644 --- a/arch/csky/kernel/asm-offsets.c +++ b/arch/csky/kernel/asm-offsets.c @@ -72,6 +72,7 @@ int main(void) DEFINE(PT_RLO, offsetof(struct pt_regs, rlo)); #endif DEFINE(PT_USP, offsetof(struct pt_regs, usp)); + DEFINE(PT_FRAME_SIZE, sizeof(struct pt_regs)); /* offsets into the irq_cpustat_t struct */ DEFINE(CPUSTAT_SOFTIRQ_PENDING, offsetof(irq_cpustat_t, diff --git a/arch/csky/kernel/ftrace.c b/arch/csky/kernel/ftrace.c index 44f4880179b7..b4502cd2eabe 100644 --- a/arch/csky/kernel/ftrace.c +++ b/arch/csky/kernel/ftrace.c @@ -126,6 +126,9 @@ int ftrace_update_ftrace_func(ftrace_func_t func) { int ret = ftrace_modify_code((unsigned long)&ftrace_call, (unsigned long)func, true, true); + if (!ret) + ret = ftrace_modify_code((unsigned long)&ftrace_regs_call, + (unsigned long)func, true, true); return ret; } @@ -135,6 +138,14 @@ int __init ftrace_dyn_arch_init(void) } #endif /* CONFIG_DYNAMIC_FTRACE */ +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, + unsigned long addr) +{ + return ftrace_modify_code(rec->ip, addr, true, true); +} +#endif + #ifdef CONFIG_FUNCTION_GRAPH_TRACER void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, unsigned long frame_pointer) |