diff options
Diffstat (limited to 'arch/x86/kernel/dumpstack_32.c')
| -rw-r--r-- | arch/x86/kernel/dumpstack_32.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c new file mode 100644 index 000000000..464ffd69b --- /dev/null +++ b/arch/x86/kernel/dumpstack_32.c @@ -0,0 +1,177 @@ +/* + * 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 (;;) { + struct thread_info *context; + void *end_stack; + + end_stack = is_hardirq_stack(stack, cpu); + if (!end_stack) + end_stack = is_softirq_stack(stack, cpu); + + context = task_thread_info(task); + bp = ops->walk_stack(context, 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 (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; +} |