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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156// 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;}