182 lines
4.4 KiB
C
182 lines
4.4 KiB
C
![]() |
/* Provide basic stack dumping functions
|
||
|
*
|
||
|
* Copyright 2004-2009 Analog Devices Inc.
|
||
|
*
|
||
|
* Licensed under the GPL-2 or later
|
||
|
*/
|
||
|
|
||
|
#include <linux/kernel.h>
|
||
|
#include <linux/thread_info.h>
|
||
|
#include <linux/mm.h>
|
||
|
#include <linux/uaccess.h>
|
||
|
#include <linux/module.h>
|
||
|
#include <asm/trace.h>
|
||
|
|
||
|
/*
|
||
|
* Checks to see if the address pointed to is either a
|
||
|
* 16-bit CALL instruction, or a 32-bit CALL instruction
|
||
|
*/
|
||
|
static bool is_bfin_call(unsigned short *addr)
|
||
|
{
|
||
|
unsigned short opcode = 0, *ins_addr;
|
||
|
ins_addr = (unsigned short *)addr;
|
||
|
|
||
|
if (!get_instruction(&opcode, ins_addr))
|
||
|
return false;
|
||
|
|
||
|
if ((opcode >= 0x0060 && opcode <= 0x0067) ||
|
||
|
(opcode >= 0x0070 && opcode <= 0x0077))
|
||
|
return true;
|
||
|
|
||
|
ins_addr--;
|
||
|
if (!get_instruction(&opcode, ins_addr))
|
||
|
return false;
|
||
|
|
||
|
if (opcode >= 0xE300 && opcode <= 0xE3FF)
|
||
|
return true;
|
||
|
|
||
|
return false;
|
||
|
|
||
|
}
|
||
|
|
||
|
void show_stack(struct task_struct *task, unsigned long *stack)
|
||
|
{
|
||
|
#ifdef CONFIG_PRINTK
|
||
|
unsigned int *addr, *endstack, *fp = 0, *frame;
|
||
|
unsigned short *ins_addr;
|
||
|
char buf[150];
|
||
|
unsigned int i, j, ret_addr, frame_no = 0;
|
||
|
|
||
|
/*
|
||
|
* If we have been passed a specific stack, use that one otherwise
|
||
|
* if we have been passed a task structure, use that, otherwise
|
||
|
* use the stack of where the variable "stack" exists
|
||
|
*/
|
||
|
|
||
|
if (stack == NULL) {
|
||
|
if (task) {
|
||
|
/* We know this is a kernel stack, so this is the start/end */
|
||
|
stack = (unsigned long *)task->thread.ksp;
|
||
|
endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
|
||
|
} else {
|
||
|
/* print out the existing stack info */
|
||
|
stack = (unsigned long *)&stack;
|
||
|
endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
|
||
|
}
|
||
|
} else
|
||
|
endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
|
||
|
|
||
|
printk(KERN_NOTICE "Stack info:\n");
|
||
|
decode_address(buf, (unsigned int)stack);
|
||
|
printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
|
||
|
|
||
|
if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
|
||
|
printk(KERN_NOTICE "Invalid stack pointer\n");
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/* First thing is to look for a frame pointer */
|
||
|
for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
|
||
|
if (*addr & 0x1)
|
||
|
continue;
|
||
|
ins_addr = (unsigned short *)*addr;
|
||
|
ins_addr--;
|
||
|
if (is_bfin_call(ins_addr))
|
||
|
fp = addr - 1;
|
||
|
|
||
|
if (fp) {
|
||
|
/* Let's check to see if it is a frame pointer */
|
||
|
while (fp >= (addr - 1) && fp < endstack
|
||
|
&& fp && ((unsigned int) fp & 0x3) == 0)
|
||
|
fp = (unsigned int *)*fp;
|
||
|
if (fp == 0 || fp == endstack) {
|
||
|
fp = addr - 1;
|
||
|
break;
|
||
|
}
|
||
|
fp = 0;
|
||
|
}
|
||
|
}
|
||
|
if (fp) {
|
||
|
frame = fp;
|
||
|
printk(KERN_NOTICE " FP: (0x%p)\n", fp);
|
||
|
} else
|
||
|
frame = 0;
|
||
|
|
||
|
/*
|
||
|
* Now that we think we know where things are, we
|
||
|
* walk the stack again, this time printing things out
|
||
|
* incase there is no frame pointer, we still look for
|
||
|
* valid return addresses
|
||
|
*/
|
||
|
|
||
|
/* First time print out data, next time, print out symbols */
|
||
|
for (j = 0; j <= 1; j++) {
|
||
|
if (j)
|
||
|
printk(KERN_NOTICE "Return addresses in stack:\n");
|
||
|
else
|
||
|
printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
|
||
|
|
||
|
fp = frame;
|
||
|
frame_no = 0;
|
||
|
|
||
|
for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
|
||
|
addr < endstack; addr++, i++) {
|
||
|
|
||
|
ret_addr = 0;
|
||
|
if (!j && i % 8 == 0)
|
||
|
printk(KERN_NOTICE "%p:", addr);
|
||
|
|
||
|
/* if it is an odd address, or zero, just skip it */
|
||
|
if (*addr & 0x1 || !*addr)
|
||
|
goto print;
|
||
|
|
||
|
ins_addr = (unsigned short *)*addr;
|
||
|
|
||
|
/* Go back one instruction, and see if it is a CALL */
|
||
|
ins_addr--;
|
||
|
ret_addr = is_bfin_call(ins_addr);
|
||
|
print:
|
||
|
if (!j && stack == (unsigned long *)addr)
|
||
|
printk("[%08x]", *addr);
|
||
|
else if (ret_addr)
|
||
|
if (j) {
|
||
|
decode_address(buf, (unsigned int)*addr);
|
||
|
if (frame == addr) {
|
||
|
printk(KERN_NOTICE " frame %2i : %s\n", frame_no, buf);
|
||
|
continue;
|
||
|
}
|
||
|
printk(KERN_NOTICE " address : %s\n", buf);
|
||
|
} else
|
||
|
printk("<%08x>", *addr);
|
||
|
else if (fp == addr) {
|
||
|
if (j)
|
||
|
frame = addr+1;
|
||
|
else
|
||
|
printk("(%08x)", *addr);
|
||
|
|
||
|
fp = (unsigned int *)*addr;
|
||
|
frame_no++;
|
||
|
|
||
|
} else if (!j)
|
||
|
printk(" %08x ", *addr);
|
||
|
}
|
||
|
if (!j)
|
||
|
printk("\n");
|
||
|
}
|
||
|
#endif
|
||
|
}
|
||
|
EXPORT_SYMBOL(show_stack);
|
||
|
|
||
|
void dump_stack(void)
|
||
|
{
|
||
|
unsigned long stack;
|
||
|
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
|
||
|
int tflags;
|
||
|
#endif
|
||
|
trace_buffer_save(tflags);
|
||
|
dump_bfin_trace_buffer();
|
||
|
show_stack(current, &stack);
|
||
|
trace_buffer_restore(tflags);
|
||
|
}
|
||
|
EXPORT_SYMBOL(dump_stack);
|