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Diffstat (limited to 'arch/x86/kernel/dumpstack_32.c')
-rw-r--r--arch/x86/kernel/dumpstack_32.c177
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, &regs->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;
+}