forked from Minki/linux
9a95e2f100
Decode the vast majority of insns that appear in the trace buffer to get a better idea of what's going on at a glance. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
175 lines
4.2 KiB
C
175 lines
4.2 KiB
C
/* Provide basic stack dumping functions
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*
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* Copyright 2004-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later
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*/
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#include <linux/kernel.h>
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#include <linux/thread_info.h>
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#include <linux/mm.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <asm/trace.h>
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/*
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* Checks to see if the address pointed to is either a
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* 16-bit CALL instruction, or a 32-bit CALL instruction
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*/
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static bool is_bfin_call(unsigned short *addr)
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{
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unsigned int opcode;
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if (!get_instruction(&opcode, addr))
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return false;
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if ((opcode >= 0x0060 && opcode <= 0x0067) ||
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(opcode >= 0x0070 && opcode <= 0x0077) ||
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(opcode >= 0xE3000000 && opcode <= 0xE3FFFFFF))
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return true;
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return false;
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}
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void show_stack(struct task_struct *task, unsigned long *stack)
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{
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#ifdef CONFIG_PRINTK
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unsigned int *addr, *endstack, *fp = 0, *frame;
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unsigned short *ins_addr;
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char buf[150];
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unsigned int i, j, ret_addr, frame_no = 0;
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/*
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* If we have been passed a specific stack, use that one otherwise
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* if we have been passed a task structure, use that, otherwise
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* use the stack of where the variable "stack" exists
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*/
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if (stack == NULL) {
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if (task) {
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/* We know this is a kernel stack, so this is the start/end */
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stack = (unsigned long *)task->thread.ksp;
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endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
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} else {
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/* print out the existing stack info */
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stack = (unsigned long *)&stack;
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endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
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}
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} else
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endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
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printk(KERN_NOTICE "Stack info:\n");
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decode_address(buf, (unsigned int)stack);
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printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
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if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
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printk(KERN_NOTICE "Invalid stack pointer\n");
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return;
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}
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/* First thing is to look for a frame pointer */
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for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
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if (*addr & 0x1)
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continue;
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ins_addr = (unsigned short *)*addr;
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ins_addr--;
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if (is_bfin_call(ins_addr))
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fp = addr - 1;
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if (fp) {
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/* Let's check to see if it is a frame pointer */
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while (fp >= (addr - 1) && fp < endstack
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&& fp && ((unsigned int) fp & 0x3) == 0)
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fp = (unsigned int *)*fp;
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if (fp == 0 || fp == endstack) {
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fp = addr - 1;
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break;
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}
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fp = 0;
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}
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}
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if (fp) {
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frame = fp;
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printk(KERN_NOTICE " FP: (0x%p)\n", fp);
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} else
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frame = 0;
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/*
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* Now that we think we know where things are, we
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* walk the stack again, this time printing things out
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* incase there is no frame pointer, we still look for
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* valid return addresses
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*/
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/* First time print out data, next time, print out symbols */
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for (j = 0; j <= 1; j++) {
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if (j)
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printk(KERN_NOTICE "Return addresses in stack:\n");
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else
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printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
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fp = frame;
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frame_no = 0;
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for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
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addr < endstack; addr++, i++) {
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ret_addr = 0;
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if (!j && i % 8 == 0)
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printk(KERN_NOTICE "%p:", addr);
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/* if it is an odd address, or zero, just skip it */
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if (*addr & 0x1 || !*addr)
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goto print;
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ins_addr = (unsigned short *)*addr;
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/* Go back one instruction, and see if it is a CALL */
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ins_addr--;
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ret_addr = is_bfin_call(ins_addr);
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print:
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if (!j && stack == (unsigned long *)addr)
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printk("[%08x]", *addr);
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else if (ret_addr)
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if (j) {
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decode_address(buf, (unsigned int)*addr);
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if (frame == addr) {
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printk(KERN_NOTICE " frame %2i : %s\n", frame_no, buf);
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continue;
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}
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printk(KERN_NOTICE " address : %s\n", buf);
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} else
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printk("<%08x>", *addr);
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else if (fp == addr) {
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if (j)
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frame = addr+1;
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else
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printk("(%08x)", *addr);
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fp = (unsigned int *)*addr;
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frame_no++;
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} else if (!j)
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printk(" %08x ", *addr);
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}
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if (!j)
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printk("\n");
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}
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#endif
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}
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EXPORT_SYMBOL(show_stack);
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void dump_stack(void)
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{
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unsigned long stack;
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#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
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int tflags;
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#endif
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trace_buffer_save(tflags);
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dump_bfin_trace_buffer();
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show_stack(current, &stack);
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trace_buffer_restore(tflags);
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}
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EXPORT_SYMBOL(dump_stack);
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