/* * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs */ #include <linux/kallsyms.h> #include <linux/kprobes.h> #include <linux/uaccess.h> #include <linux/utsname.h> #include <linux/hardirq.h> #include <linux/kdebug.h> #include <linux/module.h> #include <linux/ptrace.h> #include <linux/kexec.h> #include <linux/bug.h> #include <linux/nmi.h> #include <linux/sysfs.h> #include <asm/stacktrace.h> #include "dumpstack.h" void dump_trace(struct task_struct *task, struct pt_regs *regs, unsigned long *stack, unsigned long bp, const struct stacktrace_ops *ops, void *data) { int graph = 0; if (!task) task = current; if (!stack) { unsigned long dummy; stack = &dummy; if (task && task != current) stack = (unsigned long *)task->thread.sp; } #ifdef CONFIG_FRAME_POINTER if (!bp) { if (task == current) { /* Grab bp right from our regs */ get_bp(bp); } else { /* bp is the last reg pushed by switch_to */ bp = *(unsigned long *) task->thread.sp; } } #endif for (;;) { struct thread_info *context; context = (struct thread_info *) ((unsigned long)stack & (~(THREAD_SIZE - 1))); bp = print_context_stack(context, stack, bp, ops, data, NULL, &graph); stack = (unsigned long *)context->previous_esp; if (!stack) break; if (ops->stack(data, "IRQ") < 0) break; touch_nmi_watchdog(); } } EXPORT_SYMBOL(dump_trace); void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, unsigned long *sp, unsigned long bp, char *log_lvl) { unsigned long *stack; int i; if (sp == NULL) { if (task) sp = (unsigned long *)task->thread.sp; else sp = (unsigned long *)&sp; } stack = sp; for (i = 0; i < kstack_depth_to_print; i++) { if (kstack_end(stack)) break; if (i && ((i % STACKSLOTS_PER_LINE) == 0)) printk("\n%s", log_lvl); printk(" %08lx", *stack++); touch_nmi_watchdog(); } printk("\n"); show_trace_log_lvl(task, regs, sp, bp, log_lvl); } void show_registers(struct pt_regs *regs) { int i; print_modules(); __show_regs(regs, 0); printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n", TASK_COMM_LEN, current->comm, task_pid_nr(current), current_thread_info(), current, task_thread_info(current)); /* * When in-kernel, we also print out the stack and code at the * time of the fault.. */ if (!user_mode_vm(regs)) { unsigned int code_prologue = code_bytes * 43 / 64; unsigned int code_len = code_bytes; unsigned char c; u8 *ip; printk(KERN_EMERG "Stack:\n"); show_stack_log_lvl(NULL, regs, ®s->sp, 0, KERN_EMERG); printk(KERN_EMERG "Code: "); ip = (u8 *)regs->ip - code_prologue; if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { /* try starting at IP */ ip = (u8 *)regs->ip; code_len = code_len - code_prologue + 1; } for (i = 0; i < code_len; i++, ip++) { if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { printk(" Bad EIP value."); break; } if (ip == (u8 *)regs->ip) printk("<%02x> ", c); else printk("%02x ", c); } } printk("\n"); } int is_valid_bugaddr(unsigned long ip) { unsigned short ud2; if (ip < PAGE_OFFSET) return 0; if (probe_kernel_address((unsigned short *)ip, ud2)) return 0; return ud2 == 0x0b0f; }