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a51ac5246d
ftrace_graph_ret_addr() can be called by stack unwinding code to convert
a found stack return address ('ret') to its original value, in case the
function graph tracer has modified it to be 'return_to_handler'. If the
hasn't been modified, the unchanged value of 'ret' is returned.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
44 lines
953 B
C
44 lines
953 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Most of this ideas comes from x86.
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*
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* Copyright (C) 2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_UNWIND_H
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#define _ASM_UNWIND_H
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#include <linux/sched.h>
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#include <asm/stacktrace.h>
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enum unwinder_type {
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UNWINDER_GUESS,
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UNWINDER_PROLOGUE,
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};
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struct unwind_state {
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char type; /* UNWINDER_XXX */
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struct stack_info stack_info;
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struct task_struct *task;
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bool first, error, is_ftrace;
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int graph_idx;
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unsigned long sp, pc, ra;
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};
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void unwind_start(struct unwind_state *state,
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struct task_struct *task, struct pt_regs *regs);
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bool unwind_next_frame(struct unwind_state *state);
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unsigned long unwind_get_return_address(struct unwind_state *state);
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static inline bool unwind_done(struct unwind_state *state)
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{
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return state->stack_info.type == STACK_TYPE_UNKNOWN;
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}
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static inline bool unwind_error(struct unwind_state *state)
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{
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return state->error;
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}
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#endif /* _ASM_UNWIND_H */
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