mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-11 19:19:42 +00:00
fdc7833964
Terminating the last trace entry with ULONG_MAX is a completely pointless exercise and none of the consumers can rely on it because it's inconsistently implemented across architectures. In fact quite some of the callers remove the entry and adjust stack_trace.nr_entries afterwards. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Alexander Potapenko <glider@google.com> Cc: Richard Weinberger <richard@nod.at> Cc: linux-um@lists.infradead.org Link: https://lkml.kernel.org/r/20190410103643.662853876@linutronix.de
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
|
|
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Copyright (C) 2013 Richard Weinberger <richard@nod.at>
|
|
* Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <linux/module.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/stacktrace.h>
|
|
|
|
void dump_trace(struct task_struct *tsk,
|
|
const struct stacktrace_ops *ops,
|
|
void *data)
|
|
{
|
|
int reliable = 0;
|
|
unsigned long *sp, bp, addr;
|
|
struct pt_regs *segv_regs = tsk->thread.segv_regs;
|
|
struct stack_frame *frame;
|
|
|
|
bp = get_frame_pointer(tsk, segv_regs);
|
|
sp = get_stack_pointer(tsk, segv_regs);
|
|
|
|
frame = (struct stack_frame *)bp;
|
|
while (((long) sp & (THREAD_SIZE-1)) != 0) {
|
|
addr = *sp;
|
|
if (__kernel_text_address(addr)) {
|
|
reliable = 0;
|
|
if ((unsigned long) sp == bp + sizeof(long)) {
|
|
frame = frame ? frame->next_frame : NULL;
|
|
bp = (unsigned long)frame;
|
|
reliable = 1;
|
|
}
|
|
ops->address(data, addr, reliable);
|
|
}
|
|
sp++;
|
|
}
|
|
}
|
|
|
|
static void save_addr(void *data, unsigned long address, int reliable)
|
|
{
|
|
struct stack_trace *trace = data;
|
|
|
|
if (!reliable)
|
|
return;
|
|
if (trace->nr_entries >= trace->max_entries)
|
|
return;
|
|
|
|
trace->entries[trace->nr_entries++] = address;
|
|
}
|
|
|
|
static const struct stacktrace_ops dump_ops = {
|
|
.address = save_addr
|
|
};
|
|
|
|
static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)
|
|
{
|
|
dump_trace(tsk, &dump_ops, trace);
|
|
}
|
|
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
{
|
|
__save_stack_trace(current, trace);
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|
|
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
|
{
|
|
__save_stack_trace(tsk, trace);
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|