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| author | Jinyang He <hejinyang@loongson.cn> | 2023-01-17 06:42:16 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-01-17 06:42:16 +0300 |
| commit | c5ac25e0d78a6f63446b8fef4d8630ccd7a2663d (patch) | |
| tree | f124050fd31b0f0cc22dcb135bb54f990cd0a63a /arch/loongarch/include | |
| parent | 5bb8d34449c4a2eb94d657b992170afafac274f9 (diff) | |
| download | linux-c5ac25e0d78a6f63446b8fef4d8630ccd7a2663d.tar.xz | |
LoongArch: Strip guess unwinder out from prologue unwinder
The prolugue unwinder rely on symbol info. When PC is not in kernel text
address, it cannot find relative symbol info and it will be broken. The
guess unwinder will be used in this case. And the guess unwinder code in
prolugue unwinder is redundant. Strip it out and set the unwinder type
in unwind_state. Make guess_unwinder::unwind_next_frame() as default way
when other unwinders cannot unwind in some extreme case.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/include')
| -rw-r--r-- | arch/loongarch/include/asm/unwind.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/unwind.h b/arch/loongarch/include/asm/unwind.h index 834ba6bd15d2..36584b95ef8b 100644 --- a/arch/loongarch/include/asm/unwind.h +++ b/arch/loongarch/include/asm/unwind.h @@ -27,6 +27,8 @@ struct unwind_state { unsigned long sp, pc, ra; }; +bool default_next_frame(struct unwind_state *state); + void unwind_start(struct unwind_state *state, struct task_struct *task, struct pt_regs *regs); bool unwind_next_frame(struct unwind_state *state); @@ -50,4 +52,31 @@ static inline unsigned long unwind_graph_addr(struct unwind_state *state, return ftrace_graph_ret_addr(state->task, &state->graph_idx, pc, (unsigned long *)(cfa - GRAPH_FAKE_OFFSET)); } + +static __always_inline void __unwind_start(struct unwind_state *state, + struct task_struct *task, struct pt_regs *regs) +{ + memset(state, 0, sizeof(*state)); + if (regs) { + state->sp = regs->regs[3]; + state->pc = regs->csr_era; + state->ra = regs->regs[1]; + } else if (task && task != current) { + state->sp = thread_saved_fp(task); + state->pc = thread_saved_ra(task); + state->ra = 0; + } else { + state->sp = (unsigned long)__builtin_frame_address(0); + state->pc = (unsigned long)__builtin_return_address(0); + state->ra = 0; + } + state->task = task; + get_stack_info(state->sp, state->task, &state->stack_info); + state->pc = unwind_graph_addr(state, state->pc, state->sp); +} + +static __always_inline unsigned long __unwind_get_return_address(struct unwind_state *state) +{ + return unwind_done(state) ? 0 : state->pc; +} #endif /* _ASM_UNWIND_H */ |