Line data    Source code

       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         116 : static void _print_addr(void *data, unsigned long address, int reliable)
      19             : {
      20         116 :         const char *loglvl = data;
      21             : 
      22         116 :         printk("%s [<%08lx>] %s%pS\n", loglvl, address, reliable ? "" : "? ",
      23             :                 (void *)address);
      24         116 : }
      25             : 
      26             : static const struct stacktrace_ops stackops = {
      27             :         .address = _print_addr
      28             : };
      29             : 
      30           5 : void show_stack(struct task_struct *task, unsigned long *stack,
      31             :                        const char *loglvl)
      32             : {
      33           5 :         struct pt_regs *segv_regs = current->thread.segv_regs;
      34             :         int i;
      35             : 
      36           5 :         if (!segv_regs && os_is_signal_stack()) {
      37           0 :                 pr_err("Received SIGSEGV in SIGSEGV handler,"
      38             :                                 " aborting stack trace!\n");
      39           0 :                 return;
      40             :         }
      41             : 
      42           5 :         if (!stack)
      43           5 :                 stack = get_stack_pointer(task, segv_regs);
      44             : 
      45           5 :         printk("%sStack:\n", loglvl);
      46          65 :         for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
      47          60 :                 if (kstack_end(stack))
      48             :                         break;
      49          60 :                 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
      50          10 :                         pr_cont("\n");
      51          60 :                 pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
      52          60 :                 stack++;
      53             :         }
      54             : 
      55           5 :         printk("%sCall Trace:\n", loglvl);
      56           5 :         dump_trace(current, &stackops, (void *)loglvl);
      57             : }