1/*
2 * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/kernel.h"
7#include "linux/smp.h"
8#include "linux/sched.h"
9#include "linux/kallsyms.h"
10#include "asm/ptrace.h"
11#include "sysrq.h"
12
13/* This is declared by <linux/sched.h> */
14void show_regs(struct pt_regs *regs)
15{
16        printk("\n");
17        printk("EIP: %04lx:[<%08lx>] CPU: %d %s",
18	       0xffff & PT_REGS_CS(regs), PT_REGS_IP(regs),
19	       smp_processor_id(), print_tainted());
20        if (PT_REGS_CS(regs) & 3)
21                printk(" ESP: %04lx:%08lx", 0xffff & PT_REGS_SS(regs),
22		       PT_REGS_SP(regs));
23        printk(" EFLAGS: %08lx\n    %s\n", PT_REGS_EFLAGS(regs),
24	       print_tainted());
25        printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
26                PT_REGS_EAX(regs), PT_REGS_EBX(regs),
27	       PT_REGS_ECX(regs),
28	       PT_REGS_EDX(regs));
29        printk("ESI: %08lx EDI: %08lx EBP: %08lx",
30	       PT_REGS_ESI(regs), PT_REGS_EDI(regs),
31	       PT_REGS_EBP(regs));
32        printk(" DS: %04lx ES: %04lx\n",
33	       0xffff & PT_REGS_DS(regs),
34	       0xffff & PT_REGS_ES(regs));
35
36        show_trace(NULL, (unsigned long *) &regs);
37}
38
39/* Copied from i386. */
40static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
41{
42	return	p > (void *)tinfo &&
43		p < (void *)tinfo + THREAD_SIZE - 3;
44}
45
46/* Adapted from i386 (we also print the address we read from). */
47static inline unsigned long print_context_stack(struct thread_info *tinfo,
48				unsigned long *stack, unsigned long ebp)
49{
50	unsigned long addr;
51
52#ifdef CONFIG_FRAME_POINTER
53	while (valid_stack_ptr(tinfo, (void *)ebp)) {
54		addr = *(unsigned long *)(ebp + 4);
55		printk("%08lx:  [<%08lx>]", ebp + 4, addr);
56		print_symbol(" %s", addr);
57		printk("\n");
58		ebp = *(unsigned long *)ebp;
59	}
60#else
61	while (valid_stack_ptr(tinfo, stack)) {
62		addr = *stack;
63		if (__kernel_text_address(addr)) {
64			printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
65			print_symbol(" %s", addr);
66			printk("\n");
67		}
68		stack++;
69	}
70#endif
71	return ebp;
72}
73
74void show_trace(struct task_struct* task, unsigned long * stack)
75{
76	unsigned long ebp;
77	struct thread_info *context;
78
79	/* Turn this into BUG_ON if possible. */
80	if (!stack) {
81		stack = (unsigned long*) &stack;
82		printk("show_trace: got NULL stack, implicit assumption task == current");
83		WARN_ON(1);
84	}
85
86	if (!task)
87		task = current;
88
89	if (task != current) {
90		ebp = (unsigned long) KSTK_EBP(task);
91	} else {
92		asm ("movl %%ebp, %0" : "=r" (ebp) : );
93	}
94
95	context = (struct thread_info *)
96		((unsigned long)stack & (~(THREAD_SIZE - 1)));
97	print_context_stack(context, stack, ebp);
98
99	printk("\n");
100}
101