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ptrace: cleanup arch_ptrace() on m68knommu

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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@gmail.com>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Namhyung Kim 2010-10-27 15:33:56 -07:00 committed by Linus Torvalds
parent add3d6e8b1
commit bf60ef9607
1 changed files with 25 additions and 29 deletions
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54
arch/m68knommu/kernel/ptrace.c
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@ -116,6 +116,8 @@ long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data) unsigned long addr, unsigned long data)
{ {
int ret; int ret;
int regno = addr >> 2;
unsigned long __user *datap = (unsigned long __user *) data;
switch (request) { switch (request) {
/* read the word at location addr in the USER area. */ /* read the word at location addr in the USER area. */
@ -123,53 +125,48 @@ long arch_ptrace(struct task_struct *child, long request,
unsigned long tmp; unsigned long tmp;
ret = -EIO; ret = -EIO;
if ((addr & 3) || addr < 0 || if ((addr & 3) || addr > sizeof(struct user) - 3)
addr > sizeof(struct user) - 3)
break; break;
tmp = 0; /* Default return condition */ tmp = 0; /* Default return condition */
addr = addr >> 2; /* temporary hack. */
ret = -EIO; ret = -EIO;
if (addr < 19) { if (regno < 19) {
tmp = get_reg(child, addr); tmp = get_reg(child, regno);
if (addr == PT_SR) if (regno == PT_SR)
tmp >>= 16; tmp >>= 16;
} else if (addr >= 21 && addr < 49) { } else if (regno >= 21 && regno < 49) {
tmp = child->thread.fp[addr - 21]; tmp = child->thread.fp[regno - 21];
} else if (addr == 49) { } else if (regno == 49) {
tmp = child->mm->start_code; tmp = child->mm->start_code;
} else if (addr == 50) { } else if (regno == 50) {
tmp = child->mm->start_data; tmp = child->mm->start_data;
} else if (addr == 51) { } else if (regno == 51) {
tmp = child->mm->end_code; tmp = child->mm->end_code;
} else } else
break; break;
ret = put_user(tmp,(unsigned long *) data); ret = put_user(tmp, datap);
break; break;
} }
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
ret = -EIO; ret = -EIO;
if ((addr & 3) || addr < 0 || if ((addr & 3) || addr > sizeof(struct user) - 3)
addr > sizeof(struct user) - 3)
break; break;
addr = addr >> 2; /* temporary hack. */ if (regno == PT_SR) {
if (addr == PT_SR) {
data &= SR_MASK; data &= SR_MASK;
data <<= 16; data <<= 16;
data |= get_reg(child, PT_SR) & ~(SR_MASK << 16); data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
} }
if (addr < 19) { if (regno < 19) {
if (put_reg(child, addr, data)) if (put_reg(child, regno, data))
break; break;
ret = 0; ret = 0;
break; 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; ret = 0;
} }
break; break;
@ -181,11 +178,11 @@ long arch_ptrace(struct task_struct *child, long request,
tmp = get_reg(child, i); tmp = get_reg(child, i);
if (i == PT_SR) if (i == PT_SR)
tmp >>= 16; tmp >>= 16;
if (put_user(tmp, (unsigned long *) data)) { if (put_user(tmp, datap)) {
ret = -EFAULT; ret = -EFAULT;
break; break;
} }
data += sizeof(unsigned long); datap++;
} }
ret = 0; ret = 0;
break; break;
@ -195,7 +192,7 @@ long arch_ptrace(struct task_struct *child, long request,
int i; int i;
unsigned long tmp; unsigned long tmp;
for (i = 0; i < 19; i++) { for (i = 0; i < 19; i++) {
if (get_user(tmp, (unsigned long *) data)) { if (get_user(tmp, datap)) {
ret = -EFAULT; ret = -EFAULT;
break; break;
} }
@ -205,7 +202,7 @@ long arch_ptrace(struct task_struct *child, long request,
tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16); tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
} }
put_reg(child, i, tmp); put_reg(child, i, tmp);
data += sizeof(unsigned long); datap++;
} }
ret = 0; ret = 0;
break; break;
@ -214,7 +211,7 @@ long arch_ptrace(struct task_struct *child, long request,
#ifdef PTRACE_GETFPREGS #ifdef PTRACE_GETFPREGS
case PTRACE_GETFPREGS: { /* Get the child FPU state. */ case PTRACE_GETFPREGS: { /* Get the child FPU state. */
ret = 0; ret = 0;
if (copy_to_user((void *)data, &child->thread.fp, if (copy_to_user(datap, &child->thread.fp,
sizeof(struct user_m68kfp_struct))) sizeof(struct user_m68kfp_struct)))
ret = -EFAULT; ret = -EFAULT;
break; break;
@ -224,7 +221,7 @@ long arch_ptrace(struct task_struct *child, long request,
#ifdef PTRACE_SETFPREGS #ifdef PTRACE_SETFPREGS
case PTRACE_SETFPREGS: { /* Set the child FPU state. */ case PTRACE_SETFPREGS: { /* Set the child FPU state. */
ret = 0; ret = 0;
if (copy_from_user(&child->thread.fp, (void *)data, if (copy_from_user(&child->thread.fp, datap,
sizeof(struct user_m68kfp_struct))) sizeof(struct user_m68kfp_struct)))
ret = -EFAULT; ret = -EFAULT;
break; break;
@ -232,8 +229,7 @@ long arch_ptrace(struct task_struct *child, long request,
#endif #endif
case PTRACE_GET_THREAD_AREA: case PTRACE_GET_THREAD_AREA:
ret = put_user(task_thread_info(child)->tp_value, ret = put_user(task_thread_info(child)->tp_value, datap);
(unsigned long __user *)data);
break; break;
default: default: