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
   6 int kstack_depth_to_print = 48;
   7
   8 void 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
  35 void 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 }