LXR linux/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> */
  14void 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. */
  40static 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). */
  47static 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
  74void 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
 102