From: Jinyang He Date: Tue, 17 Jan 2023 03:42:16 +0000 (+0800) Subject: LoongArch: Adjust PC value when unwind next frame in unwinder X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e2f27392275c7ffceb4afac1567eb325722b9ae1;p=linux.git 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 Signed-off-by: Huacai Chen --- diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kernel/unwind_prologue.c index 0f8d1451ebb84..e98b00432c885 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;