mirror of
https://github.com/torvalds/linux.git
synced 2024-11-08 21:21:47 +00:00
395810627b
Swap the 1st and 2nd parameters of save_stack_trace_regs() as same as the parameters of save_stack_trace_tsk(). Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: yrl.pp-manager.tt@hitachi.com Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Namhyung Kim <namhyung@gmail.com> Link: http://lkml.kernel.org/r/20110608070921.17777.31103.stgit@fedora15 Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/*
|
|
* Stack trace management functions
|
|
*
|
|
* Copyright (C) 2006-2009 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <linux/module.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/stacktrace.h>
|
|
|
|
static int save_stack_stack(void *data, char *name)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
__save_stack_address(void *data, unsigned long addr, bool reliable, bool nosched)
|
|
{
|
|
struct stack_trace *trace = data;
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
if (!reliable)
|
|
return;
|
|
#endif
|
|
if (nosched && in_sched_functions(addr))
|
|
return;
|
|
if (trace->skip > 0) {
|
|
trace->skip--;
|
|
return;
|
|
}
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = addr;
|
|
}
|
|
|
|
static void save_stack_address(void *data, unsigned long addr, int reliable)
|
|
{
|
|
return __save_stack_address(data, addr, reliable, false);
|
|
}
|
|
|
|
static void
|
|
save_stack_address_nosched(void *data, unsigned long addr, int reliable)
|
|
{
|
|
return __save_stack_address(data, addr, reliable, true);
|
|
}
|
|
|
|
static const struct stacktrace_ops save_stack_ops = {
|
|
.stack = save_stack_stack,
|
|
.address = save_stack_address,
|
|
.walk_stack = print_context_stack,
|
|
};
|
|
|
|
static const struct stacktrace_ops save_stack_ops_nosched = {
|
|
.stack = save_stack_stack,
|
|
.address = save_stack_address_nosched,
|
|
.walk_stack = print_context_stack,
|
|
};
|
|
|
|
/*
|
|
* Save stack-backtrace addresses into a stack_trace buffer.
|
|
*/
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
{
|
|
dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace);
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|
|
|
|
void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
|
|
{
|
|
dump_trace(current, regs, NULL, 0, &save_stack_ops, trace);
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
|
{
|
|
dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|
|
|
|
/* Userspace stacktrace - based on kernel/trace/trace_sysprof.c */
|
|
|
|
struct stack_frame_user {
|
|
const void __user *next_fp;
|
|
unsigned long ret_addr;
|
|
};
|
|
|
|
static int
|
|
copy_stack_frame(const void __user *fp, struct stack_frame_user *frame)
|
|
{
|
|
int ret;
|
|
|
|
if (!access_ok(VERIFY_READ, fp, sizeof(*frame)))
|
|
return 0;
|
|
|
|
ret = 1;
|
|
pagefault_disable();
|
|
if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
|
|
ret = 0;
|
|
pagefault_enable();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void __save_stack_trace_user(struct stack_trace *trace)
|
|
{
|
|
const struct pt_regs *regs = task_pt_regs(current);
|
|
const void __user *fp = (const void __user *)regs->bp;
|
|
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = regs->ip;
|
|
|
|
while (trace->nr_entries < trace->max_entries) {
|
|
struct stack_frame_user frame;
|
|
|
|
frame.next_fp = NULL;
|
|
frame.ret_addr = 0;
|
|
if (!copy_stack_frame(fp, &frame))
|
|
break;
|
|
if ((unsigned long)fp < regs->sp)
|
|
break;
|
|
if (frame.ret_addr) {
|
|
trace->entries[trace->nr_entries++] =
|
|
frame.ret_addr;
|
|
}
|
|
if (fp == frame.next_fp)
|
|
break;
|
|
fp = frame.next_fp;
|
|
}
|
|
}
|
|
|
|
void save_stack_trace_user(struct stack_trace *trace)
|
|
{
|
|
/*
|
|
* Trace user stack if we are not a kernel thread
|
|
*/
|
|
if (current->mm) {
|
|
__save_stack_trace_user(trace);
|
|
}
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
|