arch/um/kernel/sysrq.c

   1 /*
   2  * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/sched.h"
   7 #include "linux/kernel.h"
   8 #include "linux/module.h"
   9 #include "asm/page.h"
  10 #include "asm/processor.h"
  11 #include "sysrq.h"
  12 #include "user_util.h"
  13
  14  /*
  15   * If the address is either in the .text section of the
  16   * kernel, or in the vmalloc'ed module regions, it *may*
  17   * be the address of a calling routine
  18   */
  19
  20 #ifdef CONFIG_MODULES
  21
  22 extern struct module *module_list;
  23 extern struct module kernel_module;
  24
  25 static inline int kernel_text_address(unsigned long addr)
  26 {
  27         int retval = 0;
  28         struct module *mod;
  29
  30         if (addr >= (unsigned long) &_stext &&
  31             addr <= (unsigned long) &_etext)
  32                 return 1;
  33
  34         for (mod = module_list; mod != &kernel_module; mod = mod->next) {
  35                 /* mod_bound tests for addr being inside the vmalloc'ed
  36                  * module area. Of course it'd be better to test only
  37                  * for the .text subset... */
  38                 if (mod_bound(addr, 0, mod)) {
  39                         retval = 1;
  40                         break;
  41                 }
  42         }
  43
  44         return retval;
  45 }
  46
  47 #else
  48
  49 static inline int kernel_text_address(unsigned long addr)
  50 {
  51         return (addr >= (unsigned long) &_stext &&
  52                 addr <= (unsigned long) &_etext);
  53 }
  54
  55 #endif
  56
  57 void show_trace(unsigned long * stack)
  58 {
  59         int i;
  60         unsigned long addr;
  61
  62         if (!stack)
  63                 stack = (unsigned long*) &stack;
  64
  65         printk("Call Trace: ");
  66         i = 1;
  67         while (((long) stack & (THREAD_SIZE-1)) != 0) {
  68                 addr = *stack++;
  69                 if (kernel_text_address(addr)) {
  70                         if (i && ((i % 6) == 0))
  71                                 printk("\n   ");
  72                         printk("[<%08lx>] ", addr);
  73                         i++;
  74                 }
  75         }
  76         printk("\n");
  77 }
  78
  79 /*
  80  * The architecture-independent dump_stack generator
  81  */
  82 void dump_stack(void)
  83 {
  84         unsigned long stack;
  85
  86         show_trace(&stack);
  87 }
  88
  89 void show_trace_task(struct task_struct *tsk)
  90 {
  91         unsigned long esp = PT_REGS_SP(&tsk->thread.regs);
  92
  93         /* User space on another CPU? */
  94         if ((esp ^ (unsigned long)tsk) & (PAGE_MASK<<1))
  95                 return;
  96         show_trace((unsigned long *)esp);
  97 }
  98
  99 /*
 100  * Overrides for Emacs so that we follow Linus's tabbing style.
 101  * Emacs will notice this stuff at the end of the file and automatically
 102  * adjust the settings for this buffer only.  This must remain at the end
 103  * of the file.
 104  * ---------------------------------------------------------------------------
 105  * Local variables:
 106  * c-file-style: "linux"
 107  * End:
 108  */