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| author | Qing Zhang <zhangqing@loongson.cn> | 2022-12-10 17:40:21 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-12-14 03:41:54 +0300 |
| commit | 28ac0a9e04d7dfb42220dc9d221164d93f20fb3a (patch) | |
| tree | 520a7c5f68595d38a141a7866846f4cf40f19c1e /arch/loongarch/include/asm/ftrace.h | |
| parent | a51ac5246d2505b58229242959d2bc73d113ca50 (diff) | |
| download | linux-28ac0a9e04d7dfb42220dc9d221164d93f20fb3a.tar.xz | |
LoongArch: modules/ftrace: Initialize PLT at load time
This patch implements ftrace trampolines through plt entry.
Tested by forcing ftrace_make_call() to use the module PLT, and then
loading up a module after setting up ftrace with:
| echo ":mod:<module-name>" > set_ftrace_filter;
| echo function > current_tracer;
| modprobe <module-name>
Since FTRACE_ADDR/FTRACE_REGS_ADDR is only defined when CONFIG_DYNAMIC_
FTRACE is selected, we wrap their usage in module_init_ftrace_plt() with
ifdeffery rather than using IS_ENABLED().
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/include/asm/ftrace.h')
| -rw-r--r-- | arch/loongarch/include/asm/ftrace.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/asm/ftrace.h index 8c7d137e4871..90f9d3399b2a 100644 --- a/arch/loongarch/include/asm/ftrace.h +++ b/arch/loongarch/include/asm/ftrace.h @@ -6,6 +6,10 @@ #ifndef _ASM_LOONGARCH_FTRACE_H #define _ASM_LOONGARCH_FTRACE_H +#define FTRACE_PLT_IDX 0 +#define FTRACE_REGS_PLT_IDX 1 +#define NR_FTRACE_PLTS 2 + #define GRAPH_FAKE_OFFSET (sizeof(struct pt_regs) - offsetof(struct pt_regs, regs[1])) #ifdef CONFIG_FUNCTION_TRACER |