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| author | Qing Zhang <zhangqing@loongson.cn> | 2022-12-10 15:40:15 +0100 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-12-14 01:41:53 +0100 |
| commit | 8778ba2c8a5df11859dc6f2b2205700388b63fd3 (patch) | |
| tree | 612424dc16a18ca09c847d25ac2f7b6a84959e0b /arch/loongarch/kernel/mcount_dyn.S | |
| parent | LoongArch/ftrace: Add dynamic function graph tracer support (diff) | |
| download | linux-8778ba2c8a5df11859dc6f2b2205700388b63fd3.tar.xz linux-8778ba2c8a5df11859dc6f2b2205700388b63fd3.zip | |
LoongArch/ftrace: Add HAVE_DYNAMIC_FTRACE_WITH_REGS support
This patch implements CONFIG_DYNAMIC_FTRACE_WITH_REGS on LoongArch,
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 modified.
Co-developed-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel/mcount_dyn.S')
| -rw-r--r-- | arch/loongarch/kernel/mcount_dyn.S | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/arch/loongarch/kernel/mcount_dyn.S b/arch/loongarch/kernel/mcount_dyn.S index cce3daa2eb1e..bbabf06244c2 100644 --- a/arch/loongarch/kernel/mcount_dyn.S +++ b/arch/loongarch/kernel/mcount_dyn.S @@ -27,7 +27,7 @@ * follows the LoongArch's psABI as well. */ - .macro ftrace_regs_entry + .macro ftrace_regs_entry allregs=0 PTR_ADDI sp, sp, -PT_SIZE PTR_S t0, sp, PT_R1 /* Save parent ra at PT_R1(RA) */ PTR_S a0, sp, PT_R4 @@ -39,6 +39,30 @@ PTR_S a6, sp, PT_R10 PTR_S a7, sp, PT_R11 PTR_S fp, sp, PT_R22 + .if \allregs + PTR_S tp, sp, PT_R2 + PTR_S t0, sp, PT_R12 + PTR_S t1, sp, PT_R13 + PTR_S t2, sp, PT_R14 + PTR_S t3, sp, PT_R15 + PTR_S t4, sp, PT_R16 + PTR_S t5, sp, PT_R17 + PTR_S t6, sp, PT_R18 + PTR_S t7, sp, PT_R19 + PTR_S t8, sp, PT_R20 + PTR_S u0, sp, PT_R21 + PTR_S s0, sp, PT_R23 + PTR_S s1, sp, PT_R24 + PTR_S s2, sp, PT_R25 + PTR_S s3, sp, PT_R26 + PTR_S s4, sp, PT_R27 + PTR_S s5, sp, PT_R28 + PTR_S s6, sp, PT_R29 + PTR_S s7, sp, PT_R30 + PTR_S s8, sp, PT_R31 + /* Clear it for later use as a flag sometimes. */ + PTR_S zero, sp, PT_R0 + .endif PTR_S ra, sp, PT_ERA /* Save trace function ra at PT_ERA */ PTR_ADDI t8, sp, PT_SIZE PTR_S t8, sp, PT_R3 @@ -85,10 +109,17 @@ ftrace_common_return: SYM_CODE_END(ftrace_common) SYM_CODE_START(ftrace_caller) - ftrace_regs_entry + ftrace_regs_entry allregs=0 b ftrace_common SYM_CODE_END(ftrace_caller) +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +SYM_CODE_START(ftrace_regs_caller) + ftrace_regs_entry allregs=1 + b ftrace_common +SYM_CODE_END(ftrace_regs_caller) +#endif + #ifdef CONFIG_FUNCTION_GRAPH_TRACER SYM_CODE_START(ftrace_graph_caller) PTR_L a0, sp, PT_ERA |