X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=arch%2Fm32r%2Fkernel%2Fptrace.c;h=5f02b31448752e514b290c2c5023f72a89ab9059;hb=57cad8084e0837e0f2c97da789ec9b3f36809be9;hp=078d2a0e71c2669f3ce47673bc49e5857a03b3fc;hpb=4fd5f8267dd37aaebadfabe71d9c808821eea05a;p=powerpc.git

diff --git a/arch/m32r/kernel/ptrace.c b/arch/m32r/kernel/ptrace.c
index 078d2a0e71..5f02b31448 100644
--- a/arch/m32r/kernel/ptrace.c
+++ b/arch/m32r/kernel/ptrace.c
@@ -14,7 +14,6 @@
  *   Copyright (C) 2000 Russell King
  */
 
-#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
@@ -34,23 +33,6 @@
 #include <asm/processor.h>
 #include <asm/mmu_context.h>
 
-/*
- * Get the address of the live pt_regs for the specified task.
- * These are saved onto the top kernel stack when the process
- * is not running.
- *
- * Note: if a user thread is execve'd from kernel space, the
- * kernel stack will not be empty on entry to the kernel, so
- * ptracing these tasks will fail.
- */
-static inline struct pt_regs *
-get_user_regs(struct task_struct *task)
-{
-        return (struct pt_regs *)
-                ((unsigned long)task->thread_info + THREAD_SIZE
-                 - sizeof(struct pt_regs));
-}
-
 /*
  * This routine will get a word off of the process kernel stack.
  */
@@ -59,7 +41,7 @@ get_stack_long(struct task_struct *task, int offset)
 {
 	unsigned long *stack;
 
-	stack = (unsigned long *)get_user_regs(task);
+	stack = (unsigned long *)task_pt_regs(task);
 
 	return stack[offset];
 }
@@ -72,7 +54,7 @@ put_stack_long(struct task_struct *task, int offset, unsigned long data)
 {
 	unsigned long *stack;
 
-	stack = (unsigned long *)get_user_regs(task);
+	stack = (unsigned long *)task_pt_regs(task);
 	stack[offset] = data;
 
 	return 0;
@@ -208,7 +190,7 @@ static int ptrace_write_user(struct task_struct *tsk, unsigned long off,
  */
 static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
 {
-	struct pt_regs *regs = get_user_regs(tsk);
+	struct pt_regs *regs = task_pt_regs(tsk);
 
 	return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
 }
@@ -223,7 +205,7 @@ static int ptrace_setregs(struct task_struct *tsk, void __user *uregs)
 
 	ret = -EFAULT;
 	if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) {
-		struct pt_regs *regs = get_user_regs(tsk);
+		struct pt_regs *regs = task_pt_regs(tsk);
 		*regs = newregs;
 		ret = 0;
 	}
@@ -762,28 +744,16 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
 	int ret;
 
 	lock_kernel();
-	ret = -EPERM;
 	if (request == PTRACE_TRACEME) {
-		/* are we already being traced? */
-		if (current->ptrace & PT_PTRACED)
-			goto out;
-		/* set the ptrace bit in the process flags. */
-		current->ptrace |= PT_PTRACED;
-		ret = 0;
+		ret = ptrace_traceme();
 		goto out;
 	}
-	ret = -ESRCH;
-	read_lock(&tasklist_lock);
-	child = find_task_by_pid(pid);
-	if (child)
-		get_task_struct(child);
-	read_unlock(&tasklist_lock);
-	if (!child)
-		goto out;
 
-	ret = -EPERM;
-	if (pid == 1)		/* you may not mess with init */
+	child = ptrace_get_task_struct(pid);
+	if (IS_ERR(child)) {
+		ret = PTR_ERR(child);
 		goto out;
+	}
 
 	if (request == PTRACE_ATTACH) {
 		ret = ptrace_attach(child);