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Date: Tue, 5 Oct 2010 12:49:49 +0900
From: Namhyung Kim <namhyung@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Roland McGrath <roland@...hat.com>,
Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
Greg Ungerer <gerg@...inux.org>
Subject: [PATCH UPDATED] ptrace: cleanup arch_ptrace() on m68knommu
Use new 'regno', 'datap' variables in order to remove duplicated
expressions and unnecessary castings. Alse remove checking @addr
less than 0 because addr is now unsigned.
Signed-off-by: Namhyung Kim <namhyung@...il.com>
Acked-by: Greg Ungerer <gerg@...inux.org>
---
reworked version on top of -next. Thanks.
arch/m68knommu/kernel/ptrace.c | 54 ++++++++++++++++++---------------------
1 files changed, 25 insertions(+), 29 deletions(-)
diff --git a/arch/m68knommu/kernel/ptrace.c b/arch/m68knommu/kernel/ptrace.c
index 4ba708b..3defad4 100644
--- a/arch/m68knommu/kernel/ptrace.c
+++ b/arch/m68knommu/kernel/ptrace.c
@@ -115,6 +115,8 @@ long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret;
+ int regno = addr >> 2;
+ unsigned long __user *datap = (unsigned long __user *) data;
switch (request) {
/* read the word at location addr in the USER area. */
@@ -122,53 +124,48 @@ long arch_ptrace(struct task_struct *child, long request,
unsigned long tmp;
ret = -EIO;
- if ((addr & 3) || addr < 0 ||
- addr > sizeof(struct user) - 3)
+ if ((addr & 3) || addr > sizeof(struct user) - 3)
break;
tmp = 0; /* Default return condition */
- addr = addr >> 2; /* temporary hack. */
ret = -EIO;
- if (addr < 19) {
- tmp = get_reg(child, addr);
- if (addr == PT_SR)
+ if (regno < 19) {
+ tmp = get_reg(child, regno);
+ if (regno == PT_SR)
tmp >>= 16;
- } else if (addr >= 21 && addr < 49) {
- tmp = child->thread.fp[addr - 21];
- } else if (addr == 49) {
+ } else if (regno >= 21 && regno < 49) {
+ tmp = child->thread.fp[regno - 21];
+ } else if (regno == 49) {
tmp = child->mm->start_code;
- } else if (addr == 50) {
+ } else if (regno == 50) {
tmp = child->mm->start_data;
- } else if (addr == 51) {
+ } else if (regno == 51) {
tmp = child->mm->end_code;
} else
break;
- ret = put_user(tmp,(unsigned long *) data);
+ ret = put_user(tmp, datap);
break;
}
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
ret = -EIO;
- if ((addr & 3) || addr < 0 ||
- addr > sizeof(struct user) - 3)
+ if ((addr & 3) || addr > sizeof(struct user) - 3)
break;
- addr = addr >> 2; /* temporary hack. */
-
- if (addr == PT_SR) {
+ if (regno == PT_SR) {
data &= SR_MASK;
data <<= 16;
data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
}
- if (addr < 19) {
- if (put_reg(child, addr, data))
+ if (regno < 19) {
+ if (put_reg(child, regno, data))
break;
ret = 0;
break;
}
- if (addr >= 21 && addr < 48)
+ if (regno >= 21 && regno < 48)
{
- child->thread.fp[addr - 21] = data;
+ child->thread.fp[regno - 21] = data;
ret = 0;
}
break;
@@ -180,11 +177,11 @@ long arch_ptrace(struct task_struct *child, long request,
tmp = get_reg(child, i);
if (i == PT_SR)
tmp >>= 16;
- if (put_user(tmp, (unsigned long *) data)) {
+ if (put_user(tmp, datap)) {
ret = -EFAULT;
break;
}
- data += sizeof(unsigned long);
+ datap++;
}
ret = 0;
break;
@@ -194,7 +191,7 @@ long arch_ptrace(struct task_struct *child, long request,
int i;
unsigned long tmp;
for (i = 0; i < 19; i++) {
- if (get_user(tmp, (unsigned long *) data)) {
+ if (get_user(tmp, datap)) {
ret = -EFAULT;
break;
}
@@ -204,7 +201,7 @@ long arch_ptrace(struct task_struct *child, long request,
tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
}
put_reg(child, i, tmp);
- data += sizeof(unsigned long);
+ datap++;
}
ret = 0;
break;
@@ -213,7 +210,7 @@ long arch_ptrace(struct task_struct *child, long request,
#ifdef PTRACE_GETFPREGS
case PTRACE_GETFPREGS: { /* Get the child FPU state. */
ret = 0;
- if (copy_to_user((void *)data, &child->thread.fp,
+ if (copy_to_user(datap, &child->thread.fp,
sizeof(struct user_m68kfp_struct)))
ret = -EFAULT;
break;
@@ -223,7 +220,7 @@ long arch_ptrace(struct task_struct *child, long request,
#ifdef PTRACE_SETFPREGS
case PTRACE_SETFPREGS: { /* Set the child FPU state. */
ret = 0;
- if (copy_from_user(&child->thread.fp, (void *)data,
+ if (copy_from_user(&child->thread.fp, datap,
sizeof(struct user_m68kfp_struct)))
ret = -EFAULT;
break;
@@ -231,8 +228,7 @@ long arch_ptrace(struct task_struct *child, long request,
#endif
case PTRACE_GET_THREAD_AREA:
- ret = put_user(task_thread_info(child)->tp_value,
- (unsigned long __user *)data);
+ ret = put_user(task_thread_info(child)->tp_value, datap);
break;
default:
--
1.7.0.4
--
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