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Message-ID: <4C85D395.7040101@snapgear.com>
Date: Tue, 7 Sep 2010 15:54:29 +1000
From: Greg Ungerer <gerg@...pgear.com>
To: Namhyung Kim <namhyung@...il.com>
CC: Roland McGrath <roland@...hat.com>,
Oleg Nesterov <oleg@...hat.com>, Arnd Bergmann <arnd@...db.de>,
linux-kernel@...r.kernel.org, Greg Ungerer <gerg@...inux.org>
Subject: Re: [PATCH v2 13/24] ptrace: cleanup arch_ptrace() on m68knommu
Hi Namhyung,
Namhyung Kim wrote:
> 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>
> Cc: Greg Ungerer <gerg@...inux.org>
Looks ok to me:
Acked-by: Greg Ungerer <gerg@...inux.org>
> ---
> arch/m68knommu/kernel/ptrace.c | 58 ++++++++++++++++++---------------------
> 1 files changed, 27 insertions(+), 31 deletions(-)
>
> diff --git a/arch/m68knommu/kernel/ptrace.c b/arch/m68knommu/kernel/ptrace.c
> index 4ab9448..342baab 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. */
> @@ -122,71 +124,66 @@ 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 (regno >= 21 && regno < 49) {
> + tmp = child->thread.fp[regno - 21];
> #ifdef CONFIG_M68KFPU_EMU
> /* Convert internal fpu reg representation
> * into long double format
> */
> - if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
> + if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
> tmp = ((tmp & 0xffff0000) << 15) |
> ((tmp & 0x0000ffff) << 16);
> #endif
> - } else if (addr == 49) {
> + } 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)
> {
> #ifdef CONFIG_M68KFPU_EMU
> /* Convert long double format
> * into internal fpu reg representation
> */
> - if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
> + if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
> data <<= 15;
> data = (data & 0xffff0000) |
> ((data & 0x0000ffff) >> 1);
> }
> #endif
> - child->thread.fp[addr - 21] = data;
> + child->thread.fp[regno - 21] = data;
> ret = 0;
> }
> break;
> @@ -198,11 +195,11 @@ 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;
> @@ -212,7 +209,7 @@ 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;
> }
> @@ -222,7 +219,7 @@ 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;
> @@ -231,7 +228,7 @@ 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;
> @@ -241,7 +238,7 @@ 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;
> @@ -249,8 +246,7 @@ 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:
--
------------------------------------------------------------------------
Greg Ungerer -- Principal Engineer EMAIL: gerg@...pgear.com
SnapGear Group, McAfee PHONE: +61 7 3435 2888
8 Gardner Close FAX: +61 7 3217 5323
Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com
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