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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>
This commit is contained in:
Jinyang He 2023-01-17 11:42:16 +08:00 committed by Huacai Chen
parent 3200983fa8
commit e2f2739227
1 changed files with 6 additions and 1 deletions
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7
arch/loongarch/kernel/unwind_prologue.c
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@ -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;