m32r: convert to generic sys_ptrace

[safe/jmp/linux-2.6] / arch / m32r / kernel / ptrace.c

diff --git a/arch/m32r/kernel/ptrace.c b/arch/m32r/kernel/ptrace.c
index 9b75caa..ed4d075 100644 (file)
--- a/arch/m32r/kernel/ptrace.c
+++ b/arch/m32r/kernel/ptrace.c
@@ -14,10 +14,10 @@
  *   Copyright (C) 2000 Russell King
  */
 
-#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
+#include <linux/err.h>
 #include <linux/smp.h>
 #include <linux/smp_lock.h>
 #include <linux/errno.h>
@@ -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;
        }
@@ -587,7 +570,7 @@ withdraw_debug_trap(struct pt_regs *regs)
        }
 }
 
-static void
+void
 init_debug_traps(struct task_struct *child)
 {
        struct debug_trap *p = &child->thread.debug_trap;
@@ -610,10 +593,9 @@ void ptrace_disable(struct task_struct *child)
        /* nothing to do.. */
 }
 
-static int
-do_ptrace(long request, struct task_struct *child, long addr, long data)
+long
+arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
-       unsigned long tmp;
        int ret;
 
        switch (request) {
@@ -622,11 +604,7 @@ do_ptrace(long request, struct task_struct *child, long addr, long data)
         */
        case PTRACE_PEEKTEXT:
        case PTRACE_PEEKDATA:
-               ret = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
-               if (ret == sizeof(tmp))
-                       ret = put_user(tmp,(unsigned long __user *) data);
-               else
-                       ret = -EIO;
+               ret = generic_ptrace_peekdata(child, addr, data);
                break;
 
        /*
@@ -642,15 +620,9 @@ do_ptrace(long request, struct task_struct *child, long addr, long data)
         */
        case PTRACE_POKETEXT:
        case PTRACE_POKEDATA:
-               ret = access_process_vm(child, addr, &data, sizeof(data), 1);
-               if (ret == sizeof(data)) {
-                       ret = 0;
-                       if (request == PTRACE_POKETEXT) {
-                               invalidate_cache();
-                       }
-               } else {
-                       ret = -EIO;
-               }
+               ret = generic_ptrace_pokedata(child, addr, data);
+               if (ret == 0 && request == PTRACE_POKETEXT)
+                       invalidate_cache();
                break;
 
        /*
@@ -732,14 +704,6 @@ do_ptrace(long request, struct task_struct *child, long addr, long data)
                break;
        }
 
-       /*
-        * detach a process that was attached.
-        */
-       case PTRACE_DETACH:
-               ret = 0;
-               ret = ptrace_detach(child, data);
-               break;
-
        case PTRACE_GETREGS:
                ret = ptrace_getregs(child, (void __user *)data);
                break;
@@ -756,42 +720,6 @@ do_ptrace(long request, struct task_struct *child, long addr, long data)
        return ret;
 }
 
-asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
-{
-       struct task_struct *child;
-       int ret;
-
-       lock_kernel();
-       if (request == PTRACE_TRACEME) {
-               ret = ptrace_traceme();
-               goto out;
-       }
-
-       child = ptrace_get_task_struct(pid);
-       if (IS_ERR(child)) {
-               ret = PTR_ERR(child);
-               goto out;
-       }
-
-       if (request == PTRACE_ATTACH) {
-               ret = ptrace_attach(child);
-               if (ret == 0)
-                       init_debug_traps(child);
-               goto out_tsk;
-       }
-
-       ret = ptrace_check_attach(child, request == PTRACE_KILL);
-       if (ret == 0)
-               ret = do_ptrace(request, child, addr, data);
-
-out_tsk:
-       put_task_struct(child);
-out:
-       unlock_kernel();
-
-       return ret;
-}
-
 /* notification of system call entry/exit
  * - triggered by current->work.syscall_trace
  */