78c98f9074
Rework the dump_trace() stack unwinder interface to support different unwinding algorithms. The new interface looks like this: struct unwind_state state; unwind_for_each_frame(&state, task, regs, start_stack) do_something(state.sp, state.ip, state.reliable); The unwind_bc.c file contains the implementation for the classic back-chain unwinder. One positive side effect of the new code is it now handles ftraced functions gracefully. It prints the real name of the return function instead of 'return_to_handler'. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Stack trace management functions
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*
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* Copyright IBM Corp. 2006
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/stacktrace.h>
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#include <linux/kallsyms.h>
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#include <linux/export.h>
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#include <asm/stacktrace.h>
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#include <asm/unwind.h>
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void save_stack_trace(struct stack_trace *trace)
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{
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struct unwind_state state;
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unwind_for_each_frame(&state, current, NULL, 0) {
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if (trace->nr_entries >= trace->max_entries)
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break;
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if (trace->skip > 0)
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trace->skip--;
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else
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trace->entries[trace->nr_entries++] = state.ip;
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}
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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struct unwind_state state;
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unwind_for_each_frame(&state, tsk, NULL, 0) {
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if (trace->nr_entries >= trace->max_entries)
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break;
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if (in_sched_functions(state.ip))
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continue;
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if (trace->skip > 0)
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trace->skip--;
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else
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trace->entries[trace->nr_entries++] = state.ip;
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}
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
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{
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struct unwind_state state;
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unwind_for_each_frame(&state, current, regs, 0) {
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if (trace->nr_entries >= trace->max_entries)
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break;
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if (trace->skip > 0)
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trace->skip--;
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else
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trace->entries[trace->nr_entries++] = state.ip;
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}
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_regs);
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