1 files changed, 81 insertions, 0 deletions

diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
new file mode 100644
index 000000000000..e630438f9e73
--- /dev/null
+++ b/arch/um/kernel/sysrq.c
@@ -0,0 +1,81 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/kernel.h"
+#include "linux/module.h"
+#include "linux/kallsyms.h"
+#include "asm/page.h"
+#include "asm/processor.h"
+#include "sysrq.h"
+#include "user_util.h"
+
+void show_trace(unsigned long * stack)
+{
+        /* XXX: Copy the CONFIG_FRAME_POINTER stack-walking backtrace from
+         * arch/i386/kernel/traps.c, and then move this to sys-i386/sysrq.c.*/
+        unsigned long addr;
+
+        if (!stack) {
+                stack = (unsigned long*) &stack;
+                WARN_ON(1);
+        }
+
+        printk("Call Trace: \n");
+        while (((long) stack & (THREAD_SIZE-1)) != 0) {
+                addr = *stack;
+                if (__kernel_text_address(addr)) {
+                        printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
+                        print_symbol(" %s", addr);
+                        printk("\n");
+                }
+                stack++;
+        }
+        printk("\n");
+}
+
+/*
+ * stack dumps generator - this is used by arch-independent code.
+ * And this is identical to i386 currently.
+ */
+void dump_stack(void)
+{
+        unsigned long stack;
+
+        show_trace(&stack);
+}
+EXPORT_SYMBOL(dump_stack);
+
+/*Stolen from arch/i386/kernel/traps.c */
+static int kstack_depth_to_print = 24;
+
+/* This recently started being used in arch-independent code too, as in
+ * kernel/sched.c.*/
+void show_stack(struct task_struct *task, unsigned long *esp)
+{
+        unsigned long *stack;
+        int i;
+
+        if (esp == NULL) {
+                if (task != current) {
+                        esp = (unsigned long *) KSTK_ESP(task);
+                        /* Which one? No actual difference - just coding style.*/
+                        //esp = (unsigned long *) PT_REGS_IP(&task->thread.regs);
+                } else {
+                        esp = (unsigned long *) &esp;
+                }
+        }
+
+        stack = esp;
+        for(i = 0; i < kstack_depth_to_print; i++) {
+                if (kstack_end(stack))
+                        break;
+                if (i && ((i % 8) == 0))
+                        printk("\n       ");
+                printk("%08lx ", *stack++);
+        }
+
+        show_trace(esp);
+}