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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990// SPDX-License-Identifier: GPL-2.0-only#include <linux/sched.h>#include <linux/sched/debug.h>#include <linux/stacktrace.h>#include <linux/thread_info.h>#include <linux/ftrace.h>#include <linux/export.h>#include <asm/ptrace.h>#include <asm/stacktrace.h>
#include "kstack.h"
static void __save_stack_trace(struct thread_info *tp, struct stack_trace *trace, bool skip_sched){ unsigned long ksp, fp;#ifdef CONFIG_FUNCTION_GRAPH_TRACER struct task_struct *t; int graph = 0;#endif
if (tp == current_thread_info()) { stack_trace_flush(); __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp)); } else { ksp = tp->ksp; }
fp = ksp + STACK_BIAS;#ifdef CONFIG_FUNCTION_GRAPH_TRACER t = tp->task;#endif do { struct sparc_stackf *sf; struct pt_regs *regs; unsigned long pc;
if (!kstack_valid(tp, fp)) break;
sf = (struct sparc_stackf *) fp; regs = (struct pt_regs *) (sf + 1);
if (kstack_is_trap_frame(tp, regs)) { if (!(regs->tstate & TSTATE_PRIV)) break; pc = regs->tpc; fp = regs->u_regs[UREG_I6] + STACK_BIAS; } else { pc = sf->callers_pc; fp = (unsigned long)sf->fp + STACK_BIAS; }
if (trace->skip > 0) trace->skip--; else if (!skip_sched || !in_sched_functions(pc)) { trace->entries[trace->nr_entries++] = pc;#ifdef CONFIG_FUNCTION_GRAPH_TRACER if ((pc + 8UL) == (unsigned long) &return_to_handler) { struct ftrace_ret_stack *ret_stack; ret_stack = ftrace_graph_get_ret_stack(t, graph); if (ret_stack) { pc = ret_stack->ret; if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = pc; graph++; } }#endif } } while (trace->nr_entries < trace->max_entries);}
void save_stack_trace(struct stack_trace *trace){ __save_stack_trace(current_thread_info(), trace, false);}EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace){ struct thread_info *tp = task_thread_info(tsk);
__save_stack_trace(tp, trace, true);}EXPORT_SYMBOL_GPL(save_stack_trace_tsk);