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- // 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;
- }
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