1 files changed, 9 insertions, 38 deletions

diff --git a/arch/m32r/kernel/ptrace.c b/arch/m32r/kernel/ptrace.c
index 078d2a0e71c2..340a3bf59b88 100644
--- a/arch/m32r/kernel/ptrace.c
+++ b/arch/m32r/kernel/ptrace.c
@@ -35,23 +35,6 @@
 #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.
  */
 static inline unsigned long int
@@ -59,7 +42,7 @@ 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 +55,7 @@ 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 +191,7 @@ 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 +206,7 @@ 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 +745,16 @@ 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);