https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 91ab883eb21325ad80f3473633f794c78ac87f51 authored by Linus Torvalds on 19 February 2018, 01:29:42 UTC
Linux 4.16-rc2
Linux 4.16-rc2
Tip revision: 91ab883
stacktrace.c
#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) {
int index = t->curr_ret_stack;
if (t->ret_stack && index >= graph) {
pc = t->ret_stack[index - graph].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);