LXR linux/arch/csky/kernel/dumpstack.c

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4#include <linux/ptrace.h>
   5
   6int kstack_depth_to_print = 48;
   7
   8void show_trace(unsigned long *stack)
   9{
  10        unsigned long *stack_end;
  11        unsigned long *stack_start;
  12        unsigned long *fp;
  13        unsigned long addr;
  14
  15        addr = (unsigned long) stack & THREAD_MASK;
  16        stack_start = (unsigned long *) addr;
  17        stack_end = (unsigned long *) (addr + THREAD_SIZE);
  18
  19        fp = stack;
  20        pr_info("\nCall Trace:");
  21
  22        while (fp > stack_start && fp < stack_end) {
  23#ifdef CONFIG_STACKTRACE
  24                addr    = fp[1];
  25                fp      = (unsigned long *) fp[0];
  26#else
  27                addr    = *fp++;
  28#endif
  29                if (__kernel_text_address(addr))
  30                        pr_cont("\n[<%08lx>] %pS", addr, (void *)addr);
  31        }
  32        pr_cont("\n");
  33}
  34
  35void show_stack(struct task_struct *task, unsigned long *stack)
  36{
  37        if (!stack) {
  38                if (task)
  39                        stack = (unsigned long *)thread_saved_fp(task);
  40                else
  41#ifdef CONFIG_STACKTRACE
  42                        asm volatile("mov %0, r8\n":"=r"(stack)::"memory");
  43#else
  44                        stack = (unsigned long *)&stack;
  45#endif
  46        }
  47
  48        show_trace(stack);
  49}
  50