Commit e2f27392 authored by Jinyang He's avatar Jinyang He Committed by Huacai Chen
Browse files

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: default avatarJinyang He <hejinyang@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 3200983f

arch/loongarch/kernel/unwind_prologue.c

+6 −1
Original line number Diff line number Diff line
@@ -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;