156 lines
3.5 KiB
C
156 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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";
|
|
|
|
if (type == STACK_TYPE_ENTRY)
|
|
return "ENTRY_TRAMPOLINE";
|
|
|
|
if (type == STACK_TYPE_EXCEPTION)
|
|
return "#DF";
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool in_hardirq_stack(unsigned long *stack, struct stack_info *info)
|
|
{
|
|
unsigned long *begin = (unsigned long *)this_cpu_read(hardirq_stack_ptr);
|
|
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_ptr);
|
|
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;
|
|
}
|
|
|
|
static bool in_doublefault_stack(unsigned long *stack, struct stack_info *info)
|
|
{
|
|
struct cpu_entry_area *cea = get_cpu_entry_area(raw_smp_processor_id());
|
|
struct doublefault_stack *ss = &cea->doublefault_stack;
|
|
|
|
void *begin = ss->stack;
|
|
void *end = begin + sizeof(ss->stack);
|
|
|
|
if ((void *)stack < begin || (void *)stack >= end)
|
|
return false;
|
|
|
|
info->type = STACK_TYPE_EXCEPTION;
|
|
info->begin = begin;
|
|
info->end = end;
|
|
info->next_sp = (unsigned long *)this_cpu_read(cpu_tss_rw.x86_tss.sp);
|
|
|
|
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_entry_stack(stack, info))
|
|
goto recursion_check;
|
|
|
|
if (in_hardirq_stack(stack, info))
|
|
goto recursion_check;
|
|
|
|
if (in_softirq_stack(stack, info))
|
|
goto recursion_check;
|
|
|
|
if (in_doublefault_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;
|
|
}
|