[PATCH] uml: stack dump fix

Copy (and adapt) to UML the stack code dumper used in i386 when
CONFIG_FRAME_POINTER is enabled.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/um/include/sysrq.h b/arch/um/include/sysrq.h
index 2ce9423..c8d332b 100644 (file)
--- a/arch/um/include/sysrq.h
+++ b/arch/um/include/sysrq.h
@@ -1,6 +1,7 @@
 #ifndef __UM_SYSRQ_H
 #define __UM_SYSRQ_H
 
-extern void show_trace(unsigned long *stack);
+struct task_struct;
+extern void show_trace(struct task_struct* task, unsigned long *stack);
 
 #endif

diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index e630438..f808500 100644 (file)
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -3,6 +3,7 @@
  * Licensed under the GPL
  */
 
+#include "linux/config.h"
 #include "linux/sched.h"
 #include "linux/kernel.h"
 #include "linux/module.h"
@@ -12,14 +13,14 @@
 #include "sysrq.h"
 #include "user_util.h"
 
-void show_trace(unsigned long * stack)
+/* Catch non-i386 SUBARCH's. */
+#if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
+void show_trace(struct task_struct *task, 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;
+               stack = (unsigned long*) &stack;
                WARN_ON(1);
        }
 
@@ -35,6 +36,7 @@ void show_trace(unsigned long * stack)
         }
         printk("\n");
 }
+#endif
 
 /*
  * stack dumps generator - this is used by arch-independent code.
@@ -44,7 +46,7 @@ void dump_stack(void)
 {
        unsigned long stack;
 
-       show_trace(&stack);
+       show_trace(current, &stack);
 }
 EXPORT_SYMBOL(dump_stack);
 
@@ -59,7 +61,11 @@ void show_stack(struct task_struct *task, unsigned long *esp)
        int i;
 
        if (esp == NULL) {
-               if (task != current) {
+               if (task != current && task != NULL) {
+                       /* XXX: Isn't this bogus? I.e. isn't this the
+                        * *userspace* stack of this task? If not so, use this
+                        * even when task == current (as in i386).
+                        */
                        esp = (unsigned long *) KSTK_ESP(task);
                        /* Which one? No actual difference - just coding style.*/
                        //esp = (unsigned long *) PT_REGS_IP(&task->thread.regs);
@@ -77,5 +83,6 @@ void show_stack(struct task_struct *task, unsigned long *esp)
                printk("%08lx ", *stack++);
        }
 
-       show_trace(esp);
+       printk("Call Trace: \n");
+       show_trace(current, esp);
 }

diff --git a/arch/um/sys-i386/sysrq.c b/arch/um/sys-i386/sysrq.c
index 281fc7b..e3706d1 100644 (file)
--- a/arch/um/sys-i386/sysrq.c
+++ b/arch/um/sys-i386/sysrq.c
@@ -3,12 +3,15 @@
  * Licensed under the GPL
  */
 
+#include "linux/config.h"
 #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");
@@ -31,5 +34,80 @@ void show_regs(struct pt_regs *regs)
               0xffff & PT_REGS_DS(regs), 
               0xffff & PT_REGS_ES(regs));
 
-        show_trace((unsigned long *) &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);
+               /* Which one? No actual difference - just coding style.*/
+               ebp = (unsigned long) PT_REGS_EBP(&task->thread.regs);
+       } else {
+               asm ("movl %%ebp, %0" : "=r" (ebp) : );
+       }
+
+       context = (struct thread_info *)
+               ((unsigned long)stack & (~(THREAD_SIZE - 1)));
+       print_context_stack(context, stack, ebp);
+
+       /*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");
+}
+

diff --git a/arch/um/sys-ppc/sysrq.c b/arch/um/sys-ppc/sysrq.c
index 82d6e93..2f816f1 100644 (file)
--- a/arch/um/sys-ppc/sysrq.c
+++ b/arch/um/sys-ppc/sysrq.c
@@ -27,17 +27,5 @@ void show_regs(struct pt_regs_subarch *regs)
                 0xffff & regs->xds, 0xffff & regs->xes);
 #endif
 
-        show_trace(&regs->gpr[1]);
+        show_trace(current, &regs->gpr[1]);
 }
-
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */

diff --git a/arch/um/sys-x86_64/sysrq.c b/arch/um/sys-x86_64/sysrq.c
index ddf7469..d0a25af 100644 (file)
--- a/arch/um/sys-x86_64/sysrq.c
+++ b/arch/um/sys-x86_64/sysrq.c
@@ -36,14 +36,5 @@ void __show_regs(struct pt_regs * regs)
 void show_regs(struct pt_regs *regs)
 {
        __show_regs(regs);
-       show_trace((unsigned long *) &regs);
+       show_trace(current, (unsigned long *) &regs);
 }
-
-/* Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */

diff --git a/include/asm-um/thread_info.h b/include/asm-um/thread_info.h
index a10ea15..e4f0198 100644 (file)
--- a/include/asm-um/thread_info.h
+++ b/include/asm-um/thread_info.h
@@ -41,18 +41,17 @@ struct thread_info {
 #define init_thread_info       (init_thread_union.thread_info)
 #define init_stack             (init_thread_union.stack)
 
+#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
 /* how to get the thread information struct from C */
 static inline struct thread_info *current_thread_info(void)
 {
        struct thread_info *ti;
-       unsigned long mask = PAGE_SIZE *
-               (1 << CONFIG_KERNEL_STACK_ORDER) - 1;
-        ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
+       unsigned long mask = THREAD_SIZE - 1;
+       ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
        return ti;
 }
 
 /* thread information allocation */
-#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
 #define alloc_thread_info(tsk) \
        ((struct thread_info *) kmalloc(THREAD_SIZE, GFP_KERNEL))
 #define free_thread_info(ti) kfree(ti)