2006-07-03 07:24:41 +00:00
|
|
|
/*
|
|
|
|
* Stack trace management functions
|
|
|
|
*
|
2012-07-20 09:15:04 +00:00
|
|
|
* Copyright IBM Corp. 2006
|
2006-07-03 07:24:41 +00:00
|
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <linux/stacktrace.h>
|
|
|
|
#include <linux/kallsyms.h>
|
2008-07-17 15:16:45 +00:00
|
|
|
#include <linux/module.h>
|
2006-07-03 07:24:41 +00:00
|
|
|
|
2007-02-05 20:18:53 +00:00
|
|
|
static unsigned long save_context_stack(struct stack_trace *trace,
|
|
|
|
unsigned long sp,
|
|
|
|
unsigned long low,
|
2008-02-05 15:50:45 +00:00
|
|
|
unsigned long high,
|
|
|
|
int savesched)
|
2006-07-03 07:24:41 +00:00
|
|
|
{
|
|
|
|
struct stack_frame *sf;
|
|
|
|
struct pt_regs *regs;
|
|
|
|
unsigned long addr;
|
|
|
|
|
|
|
|
while(1) {
|
|
|
|
if (sp < low || sp > high)
|
|
|
|
return sp;
|
|
|
|
sf = (struct stack_frame *)sp;
|
|
|
|
while(1) {
|
2016-01-18 12:12:19 +00:00
|
|
|
addr = sf->gprs[8];
|
2007-07-17 11:36:07 +00:00
|
|
|
if (!trace->skip)
|
2006-07-03 07:24:41 +00:00
|
|
|
trace->entries[trace->nr_entries++] = addr;
|
|
|
|
else
|
2007-07-17 11:36:07 +00:00
|
|
|
trace->skip--;
|
2006-07-03 07:24:41 +00:00
|
|
|
if (trace->nr_entries >= trace->max_entries)
|
|
|
|
return sp;
|
|
|
|
low = sp;
|
2016-01-18 12:12:19 +00:00
|
|
|
sp = sf->back_chain;
|
2006-07-03 07:24:41 +00:00
|
|
|
if (!sp)
|
|
|
|
break;
|
|
|
|
if (sp <= low || sp > high - sizeof(*sf))
|
|
|
|
return sp;
|
|
|
|
sf = (struct stack_frame *)sp;
|
|
|
|
}
|
|
|
|
/* Zero backchain detected, check for interrupt frame. */
|
|
|
|
sp = (unsigned long)(sf + 1);
|
|
|
|
if (sp <= low || sp > high - sizeof(*regs))
|
|
|
|
return sp;
|
|
|
|
regs = (struct pt_regs *)sp;
|
2016-01-18 12:12:19 +00:00
|
|
|
addr = regs->psw.addr;
|
2008-02-05 15:50:45 +00:00
|
|
|
if (savesched || !in_sched_functions(addr)) {
|
|
|
|
if (!trace->skip)
|
|
|
|
trace->entries[trace->nr_entries++] = addr;
|
|
|
|
else
|
|
|
|
trace->skip--;
|
|
|
|
}
|
2006-07-03 07:24:41 +00:00
|
|
|
if (trace->nr_entries >= trace->max_entries)
|
|
|
|
return sp;
|
|
|
|
low = sp;
|
|
|
|
sp = regs->gprs[15];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-01 13:14:04 +00:00
|
|
|
static void __save_stack_trace(struct stack_trace *trace, unsigned long sp)
|
2006-07-03 07:24:41 +00:00
|
|
|
{
|
2016-02-01 13:14:04 +00:00
|
|
|
unsigned long new_sp, frame_size;
|
2006-07-03 07:24:41 +00:00
|
|
|
|
2016-02-01 09:13:05 +00:00
|
|
|
frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
|
2016-02-01 13:14:04 +00:00
|
|
|
new_sp = save_context_stack(trace, sp,
|
2016-02-01 09:13:05 +00:00
|
|
|
S390_lowcore.panic_stack + frame_size - PAGE_SIZE,
|
|
|
|
S390_lowcore.panic_stack + frame_size, 1);
|
2007-07-17 11:36:07 +00:00
|
|
|
new_sp = save_context_stack(trace, new_sp,
|
2016-02-01 09:13:05 +00:00
|
|
|
S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
|
|
|
|
S390_lowcore.async_stack + frame_size, 1);
|
2007-07-17 11:36:07 +00:00
|
|
|
save_context_stack(trace, new_sp,
|
2007-05-08 07:23:29 +00:00
|
|
|
S390_lowcore.thread_info,
|
2008-02-05 15:50:45 +00:00
|
|
|
S390_lowcore.thread_info + THREAD_SIZE, 1);
|
2016-02-01 13:14:04 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
|
|
{
|
|
|
|
register unsigned long r15 asm ("15");
|
|
|
|
unsigned long sp;
|
|
|
|
|
|
|
|
sp = r15;
|
|
|
|
__save_stack_trace(trace, sp);
|
2016-02-01 13:06:57 +00:00
|
|
|
if (trace->nr_entries < trace->max_entries)
|
|
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
2008-02-05 15:50:45 +00:00
|
|
|
}
|
2008-07-03 07:17:55 +00:00
|
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|
2008-02-05 15:50:45 +00:00
|
|
|
|
|
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
|
|
|
{
|
|
|
|
unsigned long sp, low, high;
|
|
|
|
|
2016-01-18 12:12:19 +00:00
|
|
|
sp = tsk->thread.ksp;
|
2016-01-31 13:23:30 +00:00
|
|
|
if (tsk == current) {
|
|
|
|
/* Get current stack pointer. */
|
|
|
|
asm volatile("la %0,0(15)" : "=a" (sp));
|
|
|
|
}
|
2008-02-05 15:50:45 +00:00
|
|
|
low = (unsigned long) task_stack_page(tsk);
|
|
|
|
high = (unsigned long) task_pt_regs(tsk);
|
|
|
|
save_context_stack(trace, sp, low, high, 0);
|
|
|
|
if (trace->nr_entries < trace->max_entries)
|
|
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
2006-07-03 07:24:41 +00:00
|
|
|
}
|
2008-07-03 07:17:55 +00:00
|
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|
2016-01-29 05:20:28 +00:00
|
|
|
|
|
|
|
void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
|
|
|
|
{
|
|
|
|
unsigned long sp;
|
|
|
|
|
|
|
|
sp = kernel_stack_pointer(regs);
|
|
|
|
__save_stack_trace(trace, sp);
|
|
|
|
if (trace->nr_entries < trace->max_entries)
|
|
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_regs);
|