Release 4.18 arch/x86/kernel/dumpstack_32.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";

	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Josh Poimboeuf
32
78.05%
2
50.00%
Andrew Lutomirski
7
17.07%
1
25.00%
Dave Hansen
2
4.88%
1
25.00%
Total
41
100.00%
4
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Josh Poimboeuf
80
84.21%
3
75.00%
Steven Rostedt
15
15.79%
1
25.00%
Total
95
100.00%
4
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Josh Poimboeuf
78
82.11%
4
80.00%
Steven Rostedt
17
17.89%
1
20.00%
Total
95
100.00%
5
100.00%



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;

	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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Josh Poimboeuf
136
83.44%
3
50.00%
Steven Rostedt
15
9.20%
1
16.67%
Andrew Lutomirski
11
6.75%
1
16.67%
Dave Hansen
1
0.61%
1
16.67%
Total
163
100.00%
6
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Josh Poimboeuf
326
74.94%
7
43.75%
Steven Rostedt
47
10.80%
1
6.25%
Alexander van Heukelum
31
7.13%
1
6.25%
Andrew Lutomirski
18
4.14%
1
6.25%
Ingo Molnar
6
1.38%
2
12.50%
Dave Hansen
3
0.69%
1
6.25%
Andrew Morton
2
0.46%
1
6.25%
Greg Kroah-Hartman
1
0.23%
1
6.25%
Paul Gortmaker
1
0.23%
1
6.25%
Total
435
100.00%
16
100.00%
Directory: arch/x86/kernel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.