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 *) ®s); 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 } 101 102