| 1 | |
| 2 | |
| 3 | * Stack trace management functions
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| 4 | *
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| 5 | * Copyright (C) 2009-2021 Helge Deller <[email protected]>
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| 6 | * based on arch/x86/kernel/stacktrace.c by Ingo Molnar <[email protected]>
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| 7 | * and parisc unwind functions by Randolph Chung <[email protected]>
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| 8 | *
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| 9 | * TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
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| 10 |
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| 11 | #include <linux/kernel.h>
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| 12 | #include <linux/stacktrace.h>
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| 13 |
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| 14 | #include <asm/unwind.h>
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| 15 |
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| 16 | static void notrace walk_stackframe(struct task_struct *task,
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| 17 | struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie)
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| 18 | {
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| 19 | struct unwind_frame_info info;
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| 20 |
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| 21 | unwind_frame_init_task(&info, task, NULL);
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| 22 | while (1) {
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| 23 | if (unwind_once(&info) < 0 || info.ip == 0)
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| 24 | break;
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| 25 |
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| 26 | if (__kernel_text_address(info.ip))
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| 27 | if (!fn(cookie, info.ip))
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| 28 | break;
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| 29 | }
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| 30 | }
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| 31 |
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| 32 | void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
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| 33 | struct task_struct *task, struct pt_regs *regs)
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| 34 | {
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| 35 | walk_stackframe(task, regs, consume_entry, cookie);
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| 36 | }
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| 37 |
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| 38 | int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
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| 39 | struct task_struct *task)
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| 40 | {
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| 41 | walk_stackframe(task, NULL, consume_entry, cookie);
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| 42 | return 1;
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| 43 | }
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