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/*
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kallsyms.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <asm/sysrq.h>
#include <os.h>
struct stack_frame {
struct stack_frame *next_frame;
unsigned long return_address;
};
static void do_stack_trace(unsigned long *sp, unsigned long bp)
{
int reliable;
unsigned long addr;
struct stack_frame *frame = (struct stack_frame *)bp;
printk(KERN_INFO "Call Trace:\n");
while (((long) sp & (THREAD_SIZE-1)) != 0) {
addr = *sp;
if (__kernel_text_address(addr)) {
reliable = 0;
if ((unsigned long) sp == bp + sizeof(long)) {
frame = frame ? frame->next_frame : NULL;
bp = (unsigned long)frame;
reliable = 1;
}
printk(KERN_INFO " [<%08lx>]", addr);
printk(KERN_CONT " %s", reliable ? "" : "? ");
print_symbol(KERN_CONT "%s", addr);
printk(KERN_CONT "\n");
}
sp++;
}
printk(KERN_INFO "\n");
}
static unsigned long get_frame_pointer(struct task_struct *task,
struct pt_regs *segv_regs)
{
if (!task || task == current)
return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
else
return KSTK_EBP(task);
}
static unsigned long *get_stack_pointer(struct task_struct *task,
struct pt_regs *segv_regs)
{
if (!task || task == current)
return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
else
return (unsigned long *)KSTK_ESP(task);
}
void show_stack(struct task_struct *task, unsigned long *stack)
{
unsigned long *sp = stack, bp = 0;
struct pt_regs *segv_regs = current->thread.segv_regs;
int i;
if (!segv_regs && os_is_signal_stack()) {
printk(KERN_ERR "Received SIGSEGV in SIGSEGV handler,"
" aborting stack trace!\n");
return;
}
#ifdef CONFIG_FRAME_POINTER
bp = get_frame_pointer(task, segv_regs);
#endif
if (!stack)
sp = get_stack_pointer(task, segv_regs);
printk(KERN_INFO "Stack:\n");
stack = sp;
for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
if (kstack_end(stack))
break;
if (i && ((i % STACKSLOTS_PER_LINE) == 0))
printk(KERN_CONT "\n");
printk(KERN_CONT " %08lx", *stack++);
}
printk(KERN_CONT "\n");
do_stack_trace(sp, bp);
}
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