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         const char *loglvl = data;
  21
  22         printk("%s [<%08lx>] %s%pS\n", loglvl, address, reliable ? "" : "? ",
  23                 (void *)address);
  24 }
  25
  26 static const struct stacktrace_ops stackops = {
  27         .address = _print_addr
  28 };
  29
  30 void show_stack(struct task_struct *task, unsigned long *stack,
  31                        const char *loglvl)
  32 {
  33         struct pt_regs *segv_regs = current->thread.segv_regs;
  34         int i;
  35
  36         if (!segv_regs && os_is_signal_stack()) {
  37                 pr_err("Received SIGSEGV in SIGSEGV handler,"
  38                                 " aborting stack trace!\n");
  39                 return;
  40         }
  41
  42         if (!stack)
  43                 stack = get_stack_pointer(task, segv_regs);
  44
  45         printk("%sStack:\n", loglvl);
  46         for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
  47                 if (kstack_end(stack))
  48                         break;
  49                 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
  50                         pr_cont("\n");
  51                 pr_cont(" %08lx", *stack++);
  52         }
  53
  54         printk("%sCall Trace:\n", loglvl);
  55         dump_trace(current, &stackops, (void *)loglvl);
  56 }