m68knommu: define arch_has_single_step() and friends

Towards adding CONFIG_UTRACE support for non-mmu m68k add
arch_has_single_step, and its support functions user_enable_single_step()
and user_disable_single_step().
[Geert] m68k conflict resolution from linux-next

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

diff --git a/arch/m68k/include/asm/ptrace.h b/arch/m68k/include/asm/ptrace.h
index 117adb1..a6ab663 100644 (file)
--- a/arch/m68k/include/asm/ptrace.h
+++ b/arch/m68k/include/asm/ptrace.h
@@ -90,11 +90,11 @@ extern void show_regs(struct pt_regs *);
  */
 struct task_struct;
 
-#ifdef CONFIG_MMU
 #define arch_has_single_step() (1)
 extern void user_enable_single_step(struct task_struct *);
 extern void user_disable_single_step(struct task_struct *);
 
+#ifdef CONFIG_MMU
 #define arch_has_block_step()  (1)
 extern void user_enable_block_step(struct task_struct *);
 #endif

diff --git a/arch/m68knommu/kernel/ptrace.c b/arch/m68knommu/kernel/ptrace.c
index ef70ca0..4d38289 100644 (file)
--- a/arch/m68knommu/kernel/ptrace.c
+++ b/arch/m68knommu/kernel/ptrace.c
@@ -86,6 +86,20 @@ static inline int put_reg(struct task_struct *task, int regno,
        return 0;
 }
 
+void user_enable_single_step(struct task_struct *task)
+{
+       unsigned long srflags;
+       srflags = get_reg(task, PT_SR) | (TRACE_BITS << 16);
+       put_reg(task, PT_SR, srflags);
+}
+
+void user_disable_single_step(struct task_struct *task)
+{
+       unsigned long srflags;
+       srflags = get_reg(task, PT_SR) & ~(TRACE_BITS << 16);
+       put_reg(task, PT_SR, srflags);
+}
+
 /*
  * Called by kernel/ptrace.c when detaching..
  *
@@ -93,10 +107,8 @@ static inline int put_reg(struct task_struct *task, int regno,
  */
 void ptrace_disable(struct task_struct *child)
 {
-       unsigned long tmp;
        /* make sure the single step bit is not set. */
-       tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
-       put_reg(child, PT_SR, tmp);
+       user_disable_single_step(child);
 }
 
 long arch_ptrace(struct task_struct *child, long request, long addr, long data)