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Linux/arch/x86/kernel/dumpstack_32.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  Copyright (C) 1991, 1992  Linus Torvalds
  4  *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
  5  */
  6 #include <linux/sched/debug.h>
  7 #include <linux/kallsyms.h>
  8 #include <linux/kprobes.h>
  9 #include <linux/uaccess.h>
 10 #include <linux/hardirq.h>
 11 #include <linux/kdebug.h>
 12 #include <linux/export.h>
 13 #include <linux/ptrace.h>
 14 #include <linux/kexec.h>
 15 #include <linux/sysfs.h>
 16 #include <linux/bug.h>
 17 #include <linux/nmi.h>
 18 
 19 #include <asm/stacktrace.h>
 20 
 21 const char *stack_type_name(enum stack_type type)
 22 {
 23         if (type == STACK_TYPE_IRQ)
 24                 return "IRQ";
 25 
 26         if (type == STACK_TYPE_SOFTIRQ)
 27                 return "SOFTIRQ";
 28 
 29         if (type == STACK_TYPE_ENTRY)
 30                 return "ENTRY_TRAMPOLINE";
 31 
 32         return NULL;
 33 }
 34 
 35 static bool in_hardirq_stack(unsigned long *stack, struct stack_info *info)
 36 {
 37         unsigned long *begin = (unsigned long *)this_cpu_read(hardirq_stack);
 38         unsigned long *end   = begin + (THREAD_SIZE / sizeof(long));
 39 
 40         /*
 41          * This is a software stack, so 'end' can be a valid stack pointer.
 42          * It just means the stack is empty.
 43          */
 44         if (stack <= begin || stack > end)
 45                 return false;
 46 
 47         info->type      = STACK_TYPE_IRQ;
 48         info->begin     = begin;
 49         info->end       = end;
 50 
 51         /*
 52          * See irq_32.c -- the next stack pointer is stored at the beginning of
 53          * the stack.
 54          */
 55         info->next_sp   = (unsigned long *)*begin;
 56 
 57         return true;
 58 }
 59 
 60 static bool in_softirq_stack(unsigned long *stack, struct stack_info *info)
 61 {
 62         unsigned long *begin = (unsigned long *)this_cpu_read(softirq_stack);
 63         unsigned long *end   = begin + (THREAD_SIZE / sizeof(long));
 64 
 65         /*
 66          * This is a software stack, so 'end' can be a valid stack pointer.
 67          * It just means the stack is empty.
 68          */
 69         if (stack <= begin || stack > end)
 70                 return false;
 71 
 72         info->type      = STACK_TYPE_SOFTIRQ;
 73         info->begin     = begin;
 74         info->end       = end;
 75 
 76         /*
 77          * The next stack pointer is stored at the beginning of the stack.
 78          * See irq_32.c.
 79          */
 80         info->next_sp   = (unsigned long *)*begin;
 81 
 82         return true;
 83 }
 84 
 85 int get_stack_info(unsigned long *stack, struct task_struct *task,
 86                    struct stack_info *info, unsigned long *visit_mask)
 87 {
 88         if (!stack)
 89                 goto unknown;
 90 
 91         task = task ? : current;
 92 
 93         if (in_task_stack(stack, task, info))
 94                 goto recursion_check;
 95 
 96         if (task != current)
 97                 goto unknown;
 98 
 99         if (in_entry_stack(stack, info))
100                 goto recursion_check;
101 
102         if (in_hardirq_stack(stack, info))
103                 goto recursion_check;
104 
105         if (in_softirq_stack(stack, info))
106                 goto recursion_check;
107 
108         goto unknown;
109 
110 recursion_check:
111         /*
112          * Make sure we don't iterate through any given stack more than once.
113          * If it comes up a second time then there's something wrong going on:
114          * just break out and report an unknown stack type.
115          */
116         if (visit_mask) {
117                 if (*visit_mask & (1UL << info->type)) {
118                         printk_deferred_once(KERN_WARNING "WARNING: stack recursion on stack type %d\n", info->type);
119                         goto unknown;
120                 }
121                 *visit_mask |= 1UL << info->type;
122         }
123 
124         return 0;
125 
126 unknown:
127         info->type = STACK_TYPE_UNKNOWN;
128         return -EINVAL;
129 }
130 

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