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 <asm/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 *) ®s); 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 } 99 100