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/* * 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/hardirq.h> #include <linux/kdebug.h> #include <linux/module.h> #include <linux/ptrace.h> #include <linux/kexec.h> #include <linux/sysfs.h> #include <linux/bug.h> #include <linux/nmi.h> #include <asm/stacktrace.h> static void *is_irq_stack(void *p, void *irq) { if (p < irq || p >= (irq + THREAD_SIZE)) return NULL; return irq + THREAD_SIZE; } static void *is_hardirq_stack(unsigned long *stack, int cpu) { void *irq = per_cpu(hardirq_stack, cpu); return is_irq_stack(stack, irq); } static void *is_softirq_stack(unsigned long *stack, int cpu) { void *irq = per_cpu(softirq_stack, cpu); return is_irq_stack(stack, irq); } void dump_trace(struct task_struct *task, struct pt_regs *regs, unsigned long *stack, unsigned long bp, const struct stacktrace_ops *ops, void *data) { const unsigned cpu = get_cpu(); int graph = 0; u32 *prev_esp; if (!task) task = current; if (!stack) { unsigned long dummy; stack = &dummy; if (task != current) stack = (unsigned long *)task->thread.sp; } if (!bp) bp = stack_frame(task, regs); for (;;) { void *end_stack; end_stack = is_hardirq_stack(stack, cpu); if (!end_stack) end_stack = is_softirq_stack(stack, cpu); bp = ops->walk_stack(task, stack, bp, ops, data, end_stack, &graph); /* Stop if not on irq stack */ if (!end_stack) break; /* The previous esp is saved on the bottom of the stack */ prev_esp = (u32 *)(end_stack - THREAD_SIZE); stack = (unsigned long *)*prev_esp; if (!stack) break; if (ops->stack(data, "IRQ") < 0) break; touch_nmi_watchdog(); } put_cpu(); } 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 (regs) sp = (unsigned long *)regs->sp; else 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 % STACKSLOTS_PER_LINE) == 0) { if (i != 0) pr_cont("\n"); printk("%s %08lx", log_lvl, *stack++); } else pr_cont(" %08lx", *stack++); touch_nmi_watchdog(); } pr_cont("\n"); show_trace_log_lvl(task, regs, sp, bp, log_lvl); } void show_regs(struct pt_regs *regs) { int i; show_regs_print_info(KERN_EMERG); __show_regs(regs, !user_mode(regs)); /* * When in-kernel, we also print out the stack and code at the * time of the fault.. */ if (!user_mode(regs)) { unsigned int code_prologue = code_bytes * 43 / 64; unsigned int code_len = code_bytes; unsigned char c; u8 *ip; pr_emerg("Stack:\n"); show_stack_log_lvl(NULL, regs, ®s->sp, 0, KERN_EMERG); pr_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)) { pr_cont(" Bad EIP value."); break; } if (ip == (u8 *)regs->ip) pr_cont(" <%02x>", c); else pr_cont(" %02x", c); } } pr_cont("\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; }
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