1 files changed, 101 insertions, 0 deletions

diff --git a/arch/x86/um/sysrq_32.c b/arch/x86/um/sysrq_32.c
new file mode 100644
index 000000000000..171b3e9dc867
--- /dev/null
+++ b/arch/x86/um/sysrq_32.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/smp.h"
+#include "linux/sched.h"
+#include "linux/kallsyms.h"
+#include "asm/ptrace.h"
+#include "sysrq.h"
+
+/* This is declared by <linux/sched.h> */
+void show_regs(struct pt_regs *regs)
+{
+        printk("\n");
+        printk("EIP: %04lx:[<%08lx>] CPU: %d %s", 
+               0xffff & PT_REGS_CS(regs), PT_REGS_IP(regs),
+               smp_processor_id(), print_tainted());
+        if (PT_REGS_CS(regs) & 3)
+                printk(" ESP: %04lx:%08lx", 0xffff & PT_REGS_SS(regs),
+                       PT_REGS_SP(regs));
+        printk(" EFLAGS: %08lx\n    %s\n", PT_REGS_EFLAGS(regs),
+               print_tainted());
+        printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
+                PT_REGS_EAX(regs), PT_REGS_EBX(regs), 
+               PT_REGS_ECX(regs), 
+               PT_REGS_EDX(regs));
+        printk("ESI: %08lx EDI: %08lx EBP: %08lx",
+               PT_REGS_ESI(regs), PT_REGS_EDI(regs), 
+               PT_REGS_EBP(regs));
+        printk(" DS: %04lx ES: %04lx\n",
+               0xffff & PT_REGS_DS(regs), 
+               0xffff & PT_REGS_ES(regs));
+
+        show_trace(NULL, (unsigned long *) &regs);
+}
+
+/* Copied from i386. */
+static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
+{
+        return  p > (void *)tinfo &&
+                p < (void *)tinfo + THREAD_SIZE - 3;
+}
+
+/* Adapted from i386 (we also print the address we read from). */
+static inline unsigned long print_context_stack(struct thread_info *tinfo,
+                                unsigned long *stack, unsigned long ebp)
+{
+        unsigned long addr;
+
+#ifdef CONFIG_FRAME_POINTER
+        while (valid_stack_ptr(tinfo, (void *)ebp)) {
+                addr = *(unsigned long *)(ebp + 4);
+                printk("%08lx:  [<%08lx>]", ebp + 4, addr);
+                print_symbol(" %s", addr);
+                printk("\n");
+                ebp = *(unsigned long *)ebp;
+        }
+#else
+        while (valid_stack_ptr(tinfo, stack)) {
+                addr = *stack;
+                if (__kernel_text_address(addr)) {
+                        printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
+                        print_symbol(" %s", addr);
+                        printk("\n");
+                }
+                stack++;
+        }
+#endif
+        return ebp;
+}
+
+void show_trace(struct task_struct* task, unsigned long * stack)
+{
+        unsigned long ebp;
+        struct thread_info *context;
+
+        /* Turn this into BUG_ON if possible. */
+        if (!stack) {
+                stack = (unsigned long*) &stack;
+                printk("show_trace: got NULL stack, implicit assumption task == current");
+                WARN_ON(1);
+        }
+
+        if (!task)
+                task = current;
+
+        if (task != current) {
+                ebp = (unsigned long) KSTK_EBP(task);
+        } else {
+                asm ("movl %%ebp, %0" : "=r" (ebp) : );
+        }
+
+        context = (struct thread_info *)
+                ((unsigned long)stack & (~(THREAD_SIZE - 1)));
+        print_context_stack(context, stack, ebp);
+
+        printk("\n");
+}
+