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93 lines
2.3 KiB
93 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Stack trace management functions |
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* |
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* Copyright (C) 2006 Atsushi Nemoto <[email protected]> |
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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/sched/task_stack.h> |
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#include <linux/stacktrace.h> |
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#include <linux/export.h> |
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#include <asm/stacktrace.h> |
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/* |
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* Save stack-backtrace addresses into a stack_trace buffer: |
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*/ |
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static void save_raw_context_stack(struct stack_trace *trace, |
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unsigned long reg29, int savesched) |
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{ |
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unsigned long *sp = (unsigned long *)reg29; |
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unsigned long addr; |
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while (!kstack_end(sp)) { |
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addr = *sp++; |
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if (__kernel_text_address(addr) && |
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(savesched || !in_sched_functions(addr))) { |
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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++] = addr; |
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if (trace->nr_entries >= trace->max_entries) |
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break; |
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} |
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} |
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} |
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static void save_context_stack(struct stack_trace *trace, |
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struct task_struct *tsk, struct pt_regs *regs, int savesched) |
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{ |
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unsigned long sp = regs->regs[29]; |
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#ifdef CONFIG_KALLSYMS |
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unsigned long ra = regs->regs[31]; |
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unsigned long pc = regs->cp0_epc; |
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if (raw_show_trace || !__kernel_text_address(pc)) { |
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unsigned long stack_page = |
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(unsigned long)task_stack_page(tsk); |
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if (stack_page && sp >= stack_page && |
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sp <= stack_page + THREAD_SIZE - 32) |
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save_raw_context_stack(trace, sp, savesched); |
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return; |
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} |
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do { |
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if (savesched || !in_sched_functions(pc)) { |
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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++] = pc; |
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if (trace->nr_entries >= trace->max_entries) |
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break; |
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} |
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pc = unwind_stack(tsk, &sp, pc, &ra); |
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} while (pc); |
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#else |
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save_raw_context_stack(trace, sp, savesched); |
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#endif |
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} |
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/* |
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* Save stack-backtrace addresses into a stack_trace buffer. |
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*/ |
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void save_stack_trace(struct stack_trace *trace) |
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{ |
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save_stack_trace_tsk(current, trace); |
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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 pt_regs dummyregs; |
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struct pt_regs *regs = &dummyregs; |
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WARN_ON(trace->nr_entries || !trace->max_entries); |
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if (tsk != current) { |
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regs->regs[29] = tsk->thread.reg29; |
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regs->regs[31] = 0; |
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regs->cp0_epc = tsk->thread.reg31; |
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} else |
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prepare_frametrace(regs); |
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save_context_stack(trace, tsk, regs, tsk == current); |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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