arch/x86/um/sysrq_32.c

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