80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
|
/**
|
||
|
|
* arch/s390/oprofile/backtrace.c
|
||
|
|
*
|
||
|
|
* S390 Version
|
||
|
|
* Copyright (C) 2005 IBM Corporation, IBM Deutschland Entwicklung GmbH.
|
||
|
|
* Author(s): Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/oprofile.h>
|
||
|
|
|
||
|
|
#include <asm/processor.h> /* for struct stack_frame */
|
||
|
|
|
||
|
|
static unsigned long
|
||
|
|
__show_trace(unsigned int *depth, unsigned long sp,
|
||
|
|
unsigned long low, unsigned long high)
|
||
|
|
{
|
||
|
|
struct stack_frame *sf;
|
||
|
|
struct pt_regs *regs;
|
||
|
|
|
||
|
|
while (*depth) {
|
||
|
|
sp = sp & PSW_ADDR_INSN;
|
||
|
|
if (sp < low || sp > high - sizeof(*sf))
|
||
|
|
return sp;
|
||
|
|
sf = (struct stack_frame *) sp;
|
||
|
|
(*depth)--;
|
||
|
|
oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
|
||
|
|
|
||
|
|
/* Follow the backchain. */
|
||
|
|
while (*depth) {
|
||
|
|
low = sp;
|
||
|
|
sp = sf->back_chain & PSW_ADDR_INSN;
|
||
|
|
if (!sp)
|
||
|
|
break;
|
||
|
|
if (sp <= low || sp > high - sizeof(*sf))
|
||
|
|
return sp;
|
||
|
|
sf = (struct stack_frame *) sp;
|
||
|
|
(*depth)--;
|
||
|
|
oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
if (*depth == 0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
/* 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;
|
||
|
|
(*depth)--;
|
||
|
|
oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
|
||
|
|
low = sp;
|
||
|
|
sp = regs->gprs[15];
|
||
|
|
}
|
||
|
|
return sp;
|
||
|
|
}
|
||
|
|
|
||
|
|
void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
|
||
|
|
{
|
||
|
|
unsigned long head;
|
||
|
|
struct stack_frame* head_sf;
|
||
|
|
|
||
|
|
if (user_mode (regs))
|
||
|
|
return;
|
||
|
|
|
||
|
|
head = regs->gprs[15];
|
||
|
|
head_sf = (struct stack_frame*)head;
|
||
|
|
|
||
|
|
if (!head_sf->back_chain)
|
||
|
|
return;
|
||
|
|
|
||
|
|
head = head_sf->back_chain;
|
||
|
|
|
||
|
|
head = __show_trace(&depth, head, S390_lowcore.async_stack - ASYNC_SIZE,
|
||
|
|
S390_lowcore.async_stack);
|
||
|
|
|
||
|
|
__show_trace(&depth, head, S390_lowcore.thread_info,
|
||
|
|
S390_lowcore.thread_info + THREAD_SIZE);
|
||
|
|
}
|