mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 08:15:17 +07:00
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
|
/*
|
||
|
|
* Stack trace management functions
|
||
|
|
*
|
||
|
|
* Copyright (C) 2009 Helge Deller <deller@gmx.de>
|
||
|
|
* based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
|
||
|
|
* and parisc unwind functions by Randolph Chung <tausq@debian.org>
|
||
|
|
*
|
||
|
|
* TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
|
||
|
|
*/
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/stacktrace.h>
|
||
|
|
|
||
|
|
#include <asm/unwind.h>
|
||
|
|
|
||
|
|
static void dump_trace(struct task_struct *task, struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
struct unwind_frame_info info;
|
||
|
|
|
||
|
|
/* initialize unwind info */
|
||
|
|
if (task == current) {
|
||
|
|
unsigned long sp;
|
||
|
|
struct pt_regs r;
|
||
|
|
HERE:
|
||
|
|
asm volatile ("copy %%r30, %0" : "=r"(sp));
|
||
|
|
memset(&r, 0, sizeof(struct pt_regs));
|
||
|
|
r.iaoq[0] = (unsigned long)&&HERE;
|
||
|
|
r.gr[2] = (unsigned long)__builtin_return_address(0);
|
||
|
|
r.gr[30] = sp;
|
||
|
|
unwind_frame_init(&info, task, &r);
|
||
|
|
} else {
|
||
|
|
unwind_frame_init_from_blocked_task(&info, task);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* unwind stack and save entries in stack_trace struct */
|
||
|
|
trace->nr_entries = 0;
|
||
|
|
while (trace->nr_entries < trace->max_entries) {
|
||
|
|
if (unwind_once(&info) < 0 || info.ip == 0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
if (__kernel_text_address(info.ip))
|
||
|
|
trace->entries[trace->nr_entries++] = info.ip;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Save stack-backtrace addresses into a stack_trace buffer.
|
||
|
|
*/
|
||
|
|
void save_stack_trace(struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
dump_trace(current, 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_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
dump_trace(tsk, trace);
|
||
|
|
if (trace->nr_entries < trace->max_entries)
|
||
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|