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 <[email protected]> Signed-off-by: Geert Uytterhoeven <[email protected]>
patjak · Dec 6, 2009 · f60a557 · f60a557
1 parent f195e2b
commit f60a557
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Showing 2 changed files with 16 additions and 4 deletions.
diff --git 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
@@ -86,17 +86,29 @@ 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..
  *
  * Make sure the single step bit is not set.
  */
 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)