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/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_EAX(regs), PT_REGS_EBX(regs),
  27                PT_REGS_ECX(regs),
  28                PT_REGS_EDX(regs));
  29         printk("ESI: %08lx EDI: %08lx EBP: %08lx",
  30                PT_REGS_ESI(regs), PT_REGS_EDI(regs),
  31                PT_REGS_EBP(regs));
  32         printk(" DS: %04lx ES: %04lx\n",
  33                0xffff & PT_REGS_DS(regs),
  34                0xffff & PT_REGS_ES(regs));
  35
  36         show_trace(NULL, (unsigned long *) &regs);
  37 }
  38
  39 /* Copied from i386. */
  40 static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
  41 {
  42         return  p > (void *)tinfo &&
  43                 p < (void *)tinfo + THREAD_SIZE - 3;
  44 }
  45
  46 /* Adapted from i386 (we also print the address we read from). */
  47 static inline unsigned long print_context_stack(struct thread_info *tinfo,
  48                                 unsigned long *stack, unsigned long ebp)
  49 {
  50         unsigned long addr;
  51
  52 #ifdef CONFIG_FRAME_POINTER
  53         while (valid_stack_ptr(tinfo, (void *)ebp)) {
  54                 addr = *(unsigned long *)(ebp + 4);
  55                 printk("%08lx:  [<%08lx>]", ebp + 4, addr);
  56                 print_symbol(" %s", addr);
  57                 printk("\n");
  58                 ebp = *(unsigned long *)ebp;
  59         }
  60 #else
  61         while (valid_stack_ptr(tinfo, stack)) {
  62                 addr = *stack;
  63                 if (__kernel_text_address(addr)) {
  64                         printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
  65                         print_symbol(" %s", addr);
  66                         printk("\n");
  67                 }
  68                 stack++;
  69         }
  70 #endif
  71         return ebp;
  72 }
  73
  74 void show_trace(struct task_struct* task, unsigned long * stack)
  75 {
  76         unsigned long ebp;
  77         struct thread_info *context;
  78
  79         /* Turn this into BUG_ON if possible. */
  80         if (!stack) {
  81                 stack = (unsigned long*) &stack;
  82                 printk("show_trace: got NULL stack, implicit assumption task == current");
  83                 WARN_ON(1);
  84         }
  85
  86         if (!task)
  87                 task = current;
  88
  89         if (task != current) {
  90                 ebp = (unsigned long) KSTK_EBP(task);
  91         } else {
  92                 asm ("movl %%ebp, %0" : "=r" (ebp) : );
  93         }
  94
  95         context = (struct thread_info *)
  96                 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
  97         print_context_stack(context, stack, ebp);
  98
  99         printk("\n");
 100 }
 101