arch/um/sys-i386/sysrq.c

   1 /*
   2  * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/config.h"
   7 #include "linux/kernel.h"
   8 #include "linux/smp.h"
   9 #include "linux/sched.h"
  10 #include "linux/kallsyms.h"
  11 #include "asm/ptrace.h"
  12 #include "sysrq.h"
  13
  14 /* This is declared by <linux/sched.h> */
  15 void show_regs(struct pt_regs *regs)
  16 {
  17         printk("\n");
  18         printk("EIP: %04lx:[<%08lx>] CPU: %d %s",
  19                0xffff & PT_REGS_CS(regs), PT_REGS_IP(regs),
  20                smp_processor_id(), print_tainted());
  21         if (PT_REGS_CS(regs) & 3)
  22                 printk(" ESP: %04lx:%08lx", 0xffff & PT_REGS_SS(regs),
  23                        PT_REGS_SP(regs));
  24         printk(" EFLAGS: %08lx\n    %s\n", PT_REGS_EFLAGS(regs),
  25                print_tainted());
  26         printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
  27                 PT_REGS_EAX(regs), PT_REGS_EBX(regs),
  28                PT_REGS_ECX(regs),
  29                PT_REGS_EDX(regs));
  30         printk("ESI: %08lx EDI: %08lx EBP: %08lx",
  31                PT_REGS_ESI(regs), PT_REGS_EDI(regs),
  32                PT_REGS_EBP(regs));
  33         printk(" DS: %04lx ES: %04lx\n",
  34                0xffff & PT_REGS_DS(regs),
  35                0xffff & PT_REGS_ES(regs));
  36
  37         show_trace(NULL, (unsigned long *) &regs);
  38 }
  39
  40 /* Copied from i386. */
  41 static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
  42 {
  43         return  p > (void *)tinfo &&
  44                 p < (void *)tinfo + THREAD_SIZE - 3;
  45 }
  46
  47 /* Adapted from i386 (we also print the address we read from). */
  48 static inline unsigned long print_context_stack(struct thread_info *tinfo,
  49                                 unsigned long *stack, unsigned long ebp)
  50 {
  51         unsigned long addr;
  52
  53 #ifdef CONFIG_FRAME_POINTER
  54         while (valid_stack_ptr(tinfo, (void *)ebp)) {
  55                 addr = *(unsigned long *)(ebp + 4);
  56                 printk("%08lx:  [<%08lx>]", ebp + 4, addr);
  57                 print_symbol(" %s", addr);
  58                 printk("\n");
  59                 ebp = *(unsigned long *)ebp;
  60         }
  61 #else
  62         while (valid_stack_ptr(tinfo, stack)) {
  63                 addr = *stack;
  64                 if (__kernel_text_address(addr)) {
  65                         printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
  66                         print_symbol(" %s", addr);
  67                         printk("\n");
  68                 }
  69                 stack++;
  70         }
  71 #endif
  72         return ebp;
  73 }
  74
  75 void show_trace(struct task_struct* task, unsigned long * stack)
  76 {
  77         unsigned long ebp;
  78         struct thread_info *context;
  79
  80         /* Turn this into BUG_ON if possible. */
  81         if (!stack) {
  82                 stack = (unsigned long*) &stack;
  83                 printk("show_trace: got NULL stack, implicit assumption task == current");
  84                 WARN_ON(1);
  85         }
  86
  87         if (!task)
  88                 task = current;
  89
  90         if (task != current) {
  91                 ebp = (unsigned long) KSTK_EBP(task);
  92         } else {
  93                 asm ("movl %%ebp, %0" : "=r" (ebp) : );
  94         }
  95
  96         context = (struct thread_info *)
  97                 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
  98         print_context_stack(context, stack, ebp);
  99
 100         printk("\n");
 101 }
 102