165 строки
3.6 KiB
C
165 строки
3.6 KiB
C
/*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
|
|
*/
|
|
#include <linux/sched/debug.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/kprobes.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/export.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/nmi.h>
|
|
|
|
#include <asm/stacktrace.h>
|
|
|
|
const char *stack_type_name(enum stack_type type)
|
|
{
|
|
if (type == STACK_TYPE_IRQ)
|
|
return "IRQ";
|
|
|
|
if (type == STACK_TYPE_SOFTIRQ)
|
|
return "SOFTIRQ";
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool in_hardirq_stack(unsigned long *stack, struct stack_info *info)
|
|
{
|
|
unsigned long *begin = (unsigned long *)this_cpu_read(hardirq_stack);
|
|
unsigned long *end = begin + (THREAD_SIZE / sizeof(long));
|
|
|
|
/*
|
|
* This is a software stack, so 'end' can be a valid stack pointer.
|
|
* It just means the stack is empty.
|
|
*/
|
|
if (stack <= begin || stack > end)
|
|
return false;
|
|
|
|
info->type = STACK_TYPE_IRQ;
|
|
info->begin = begin;
|
|
info->end = end;
|
|
|
|
/*
|
|
* See irq_32.c -- the next stack pointer is stored at the beginning of
|
|
* the stack.
|
|
*/
|
|
info->next_sp = (unsigned long *)*begin;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool in_softirq_stack(unsigned long *stack, struct stack_info *info)
|
|
{
|
|
unsigned long *begin = (unsigned long *)this_cpu_read(softirq_stack);
|
|
unsigned long *end = begin + (THREAD_SIZE / sizeof(long));
|
|
|
|
/*
|
|
* This is a software stack, so 'end' can be a valid stack pointer.
|
|
* It just means the stack is empty.
|
|
*/
|
|
if (stack <= begin || stack > end)
|
|
return false;
|
|
|
|
info->type = STACK_TYPE_SOFTIRQ;
|
|
info->begin = begin;
|
|
info->end = end;
|
|
|
|
/*
|
|
* The next stack pointer is stored at the beginning of the stack.
|
|
* See irq_32.c.
|
|
*/
|
|
info->next_sp = (unsigned long *)*begin;
|
|
|
|
return true;
|
|
}
|
|
|
|
int get_stack_info(unsigned long *stack, struct task_struct *task,
|
|
struct stack_info *info, unsigned long *visit_mask)
|
|
{
|
|
if (!stack)
|
|
goto unknown;
|
|
|
|
task = task ? : current;
|
|
|
|
if (in_task_stack(stack, task, info))
|
|
goto recursion_check;
|
|
|
|
if (task != current)
|
|
goto unknown;
|
|
|
|
if (in_hardirq_stack(stack, info))
|
|
goto recursion_check;
|
|
|
|
if (in_softirq_stack(stack, info))
|
|
goto recursion_check;
|
|
|
|
goto unknown;
|
|
|
|
recursion_check:
|
|
/*
|
|
* Make sure we don't iterate through any given stack more than once.
|
|
* If it comes up a second time then there's something wrong going on:
|
|
* just break out and report an unknown stack type.
|
|
*/
|
|
if (visit_mask) {
|
|
if (*visit_mask & (1UL << info->type)) {
|
|
printk_deferred_once(KERN_WARNING "WARNING: stack recursion on stack type %d\n", info->type);
|
|
goto unknown;
|
|
}
|
|
*visit_mask |= 1UL << info->type;
|
|
}
|
|
|
|
return 0;
|
|
|
|
unknown:
|
|
info->type = STACK_TYPE_UNKNOWN;
|
|
return -EINVAL;
|
|
}
|
|
|
|
void show_regs(struct pt_regs *regs)
|
|
{
|
|
int i;
|
|
|
|
show_regs_print_info(KERN_EMERG);
|
|
__show_regs(regs, !user_mode(regs));
|
|
|
|
/*
|
|
* When in-kernel, we also print out the stack and code at the
|
|
* time of the fault..
|
|
*/
|
|
if (!user_mode(regs)) {
|
|
unsigned int code_prologue = code_bytes * 43 / 64;
|
|
unsigned int code_len = code_bytes;
|
|
unsigned char c;
|
|
u8 *ip;
|
|
|
|
show_trace_log_lvl(current, regs, NULL, KERN_EMERG);
|
|
|
|
pr_emerg("Code:");
|
|
|
|
ip = (u8 *)regs->ip - code_prologue;
|
|
if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
|
|
/* try starting at IP */
|
|
ip = (u8 *)regs->ip;
|
|
code_len = code_len - code_prologue + 1;
|
|
}
|
|
for (i = 0; i < code_len; i++, ip++) {
|
|
if (ip < (u8 *)PAGE_OFFSET ||
|
|
probe_kernel_address(ip, c)) {
|
|
pr_cont(" Bad EIP value.");
|
|
break;
|
|
}
|
|
if (ip == (u8 *)regs->ip)
|
|
pr_cont(" <%02x>", c);
|
|
else
|
|
pr_cont(" %02x", c);
|
|
}
|
|
}
|
|
pr_cont("\n");
|
|
}
|