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Linux/arch/csky/kernel/dumpstack.c

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  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 }
 50 

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