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131aee8b98
When STACKTRACE is enabled, we must pass fp as stack for unwind, otherwise random value in stack will casue a dead loop. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Reported-by: Lu Baoquan <lu.baoquan@intellif.com>
50 lines
1.0 KiB
C
50 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/ptrace.h>
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int kstack_depth_to_print = 48;
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void show_trace(unsigned long *stack)
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{
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unsigned long *stack_end;
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unsigned long *stack_start;
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unsigned long *fp;
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unsigned long addr;
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addr = (unsigned long) stack & THREAD_MASK;
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stack_start = (unsigned long *) addr;
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stack_end = (unsigned long *) (addr + THREAD_SIZE);
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fp = stack;
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pr_info("\nCall Trace:");
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while (fp > stack_start && fp < stack_end) {
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#ifdef CONFIG_STACKTRACE
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addr = fp[1];
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fp = (unsigned long *) fp[0];
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#else
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addr = *fp++;
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#endif
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if (__kernel_text_address(addr))
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pr_cont("\n[<%08lx>] %pS", addr, (void *)addr);
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}
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pr_cont("\n");
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}
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void show_stack(struct task_struct *task, unsigned long *stack)
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{
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if (!stack) {
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if (task)
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stack = (unsigned long *)thread_saved_fp(task);
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else
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#ifdef CONFIG_STACKTRACE
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asm volatile("mov %0, r8\n":"=r"(stack)::"memory");
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#else
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stack = (unsigned long *)&stack;
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#endif
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}
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show_trace(stack);
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}
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