arch/parisc/kernel/stacktrace.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Stack trace management functions
   4  *
   5  *  Copyright (C) 2009-2021 Helge Deller <deller@gmx.de>
   6  *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
   7  *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
   8  *
   9  *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/stacktrace.h>
  13
  14 #include <asm/unwind.h>
  15
  16 static void notrace walk_stackframe(struct task_struct *task,
  17         struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie)
  18 {
  19         struct unwind_frame_info info;
  20
  21         unwind_frame_init_task(&info, task, NULL);
  22         while (1) {
  23                 if (unwind_once(&info) < 0 || info.ip == 0)
  24                         break;
  25
  26                 if (__kernel_text_address(info.ip))
  27                         if (!fn(cookie, info.ip))
  28                                 break;
  29         }
  30 }
  31
  32 void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
  33                      struct task_struct *task, struct pt_regs *regs)
  34 {
  35         walk_stackframe(task, regs, consume_entry, cookie);
  36 }
  37
  38 int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
  39                              struct task_struct *task)
  40 {
  41         walk_stackframe(task, NULL, consume_entry, cookie);
  42         return 1;
  43 }