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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394// SPDX-License-Identifier: GPL-2.0-only/* * Stack trace management functions * * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp> */#include <linux/sched.h>#include <linux/sched/debug.h>#include <linux/sched/task_stack.h>#include <linux/stacktrace.h>#include <linux/export.h>#include <asm/stacktrace.h>
/* * Save stack-backtrace addresses into a stack_trace buffer: */static void save_raw_context_stack(struct stack_trace *trace, unsigned long reg29, int savesched){ unsigned long *sp = (unsigned long *)reg29; unsigned long addr;
while (!kstack_end(sp)) { addr = *sp++; if (__kernel_text_address(addr) && (savesched || !in_sched_functions(addr))) { if (trace->skip > 0) trace->skip--; else trace->entries[trace->nr_entries++] = addr; if (trace->nr_entries >= trace->max_entries) break; } }}
static void save_context_stack(struct stack_trace *trace, struct task_struct *tsk, struct pt_regs *regs, int savesched){ unsigned long sp = regs->regs[29];#ifdef CONFIG_KALLSYMS unsigned long ra = regs->regs[31]; unsigned long pc = regs->cp0_epc;
if (raw_show_trace || !__kernel_text_address(pc)) { unsigned long stack_page = (unsigned long)task_stack_page(tsk); if (stack_page && sp >= stack_page && sp <= stack_page + THREAD_SIZE - 32) save_raw_context_stack(trace, sp, savesched); return; } do { if (savesched || !in_sched_functions(pc)) { if (trace->skip > 0) trace->skip--; else trace->entries[trace->nr_entries++] = pc; if (trace->nr_entries >= trace->max_entries) break; } pc = unwind_stack(tsk, &sp, pc, &ra); } while (pc);#else save_raw_context_stack(trace, sp, savesched);#endif}
/* * Save stack-backtrace addresses into a stack_trace buffer. */void save_stack_trace(struct stack_trace *trace){ save_stack_trace_tsk(current, trace);}EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace){ struct pt_regs dummyregs; struct pt_regs *regs = &dummyregs;
WARN_ON(trace->nr_entries || !trace->max_entries);
if (tsk != current) { regs->regs[29] = tsk->thread.reg29; regs->regs[31] = 0; regs->cp0_epc = tsk->thread.reg31; } else prepare_frametrace(regs); save_context_stack(trace, tsk, regs, tsk == current);}EXPORT_SYMBOL_GPL(save_stack_trace_tsk);