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c5ac25e0d7
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>
33 lines
742 B
C
33 lines
742 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2022-2023 Loongson Technology Corporation Limited
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*/
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#include <linux/kernel.h>
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#include <linux/ftrace.h>
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#include <asm/unwind.h>
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bool default_next_frame(struct unwind_state *state)
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{
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struct stack_info *info = &state->stack_info;
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unsigned long addr;
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if (unwind_done(state))
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return false;
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do {
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for (state->sp += sizeof(unsigned long);
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state->sp < info->end; state->sp += sizeof(unsigned long)) {
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addr = *(unsigned long *)(state->sp);
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state->pc = unwind_graph_addr(state, addr, state->sp + 8);
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if (__kernel_text_address(state->pc))
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return true;
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}
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state->sp = info->next_sp;
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} while (!get_stack_info(state->sp, state->task, info));
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return false;
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}
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