arch/um/kernel/sysrq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   4  * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
   5  */
   6
   7 #include <linux/kallsyms.h>
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/sched.h>
  11 #include <linux/sched/debug.h>
  12 #include <linux/sched/task_stack.h>
  13
  14 #include <asm/sysrq.h>
  15 #include <asm/stacktrace.h>
  16 #include <os.h>
  17
  18 static void _print_addr(void *data, unsigned long address, int reliable)
  19 {
  20         pr_info(" [<%08lx>] %s%pS\n", address, reliable ? "" : "? ",
  21                 (void *)address);
  22 }
  23
  24 static const struct stacktrace_ops stackops = {
  25         .address = _print_addr
  26 };
  27
  28 void show_stack(struct task_struct *task, unsigned long *stack)
  29 {
  30         unsigned long *sp = stack;
  31         struct pt_regs *segv_regs = current->thread.segv_regs;
  32         int i;
  33
  34         if (!segv_regs && os_is_signal_stack()) {
  35                 pr_err("Received SIGSEGV in SIGSEGV handler,"
  36                                 " aborting stack trace!\n");
  37                 return;
  38         }
  39
  40         if (!stack)
  41                 sp = get_stack_pointer(task, segv_regs);
  42
  43         pr_info("Stack:\n");
  44         stack = sp;
  45         for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
  46                 if (kstack_end(stack))
  47                         break;
  48                 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
  49                         pr_cont("\n");
  50                 pr_cont(" %08lx", *stack++);
  51         }
  52         pr_cont("\n");
  53
  54         pr_info("Call Trace:\n");
  55         dump_trace(current, &stackops, NULL);
  56         pr_info("\n");
  57 }