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| author | Jinyang He <hejinyang@loongson.cn> | 2023-01-17 11:42:16 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-01-17 11:42:16 +0800 |
| commit | e2f27392275c7ffceb4afac1567eb325722b9ae1 (patch) | |
| tree | af6240939a091efe2689efa358e2c8bf23ed12ee /arch | |
| parent | 3200983fa8e2c8aa17ed911b617b4a248bcb1267 (diff) | |
| download | linux-stable-e2f27392275c7ffceb4afac1567eb325722b9ae1.tar.gz linux-stable-e2f27392275c7ffceb4afac1567eb325722b9ae1.tar.bz2 linux-stable-e2f27392275c7ffceb4afac1567eb325722b9ae1.zip | |
LoongArch: Adjust PC value when unwind next frame in unwinder
When state->first is not set, the PC is a return address in the previous
frame. We need to adjust its value in case overflow to the next symbol.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/loongarch/kernel/unwind_prologue.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kernel/unwind_prologue.c index 0f8d1451ebb8..e98b00432c88 100644 --- a/arch/loongarch/kernel/unwind_prologue.c +++ b/arch/loongarch/kernel/unwind_prologue.c @@ -56,7 +56,7 @@ static bool unwind_by_prologue(struct unwind_state *state) { long frame_ra = -1; unsigned long frame_size = 0; - unsigned long size, offset, pc = state->pc; + unsigned long size, offset, pc; struct pt_regs *regs; struct stack_info *info = &state->stack_info; union loongarch_instruction *ip, *ip_end; @@ -78,6 +78,11 @@ static bool unwind_by_prologue(struct unwind_state *state) return true; } + /* + * When first is not set, the PC is a return address in the previous frame. + * We need to adjust its value in case overflow to the next symbol. + */ + pc = state->pc - (state->first ? 0 : LOONGARCH_INSN_SIZE); if (!kallsyms_lookup_size_offset(pc, &size, &offset)) return false; |