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Date: Fri, 27 Aug 2010 18:42:22 +0900
From: Namhyung Kim <namhyung@...il.com>
To: Roland McGrath <roland@...hat.com>,
Oleg Nesterov <oleg@...hat.com>, Arnd Bergmann <arnd@...db.de>
Cc: linux-kernel@...r.kernel.org, Paul Mundt <lethal@...ux-sh.org>
Subject: [RFC PATCH 36/43] ptrace, sh: cleanup arch_ptrace()
remove unnecessary castings, get rid of dummy pointer in favour of offsetof()
macro and use temporary variables in order to improve readability.
Signed-off-by: Namhyung Kim <namhyung@...il.com>
Cc: Paul Mundt <lethal@...ux-sh.org>
---
arch/sh/kernel/ptrace_32.c | 38 +++++++++++++++++++++-----------------
arch/sh/kernel/ptrace_64.c | 17 ++++++++++-------
2 files changed, 31 insertions(+), 24 deletions(-)
diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
index c81a6b9..926f706 100644
--- a/arch/sh/kernel/ptrace_32.c
+++ b/arch/sh/kernel/ptrace_32.c
@@ -341,7 +341,6 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task)
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
- struct user * dummy = NULL;
unsigned long __user *datap = (unsigned long __user *)data;
int ret;
@@ -356,17 +355,20 @@ long arch_ptrace(struct task_struct *child, long request,
if (addr < sizeof(struct pt_regs))
tmp = get_stack_long(child, addr);
- else if (addr >= (unsigned long) &dummy->fpu &&
- addr < (unsigned long) &dummy->u_fpvalid) {
+ else if (addr >= offsetof(struct user, fpu) &&
+ addr < offsetof(struct user, u_fpvalid)) {
if (!tsk_used_math(child)) {
- if (addr == (unsigned long)&dummy->fpu.fpscr)
+ if (addr == offsetof(struct user, fpu.fpscr))
tmp = FPSCR_INIT;
else
tmp = 0;
- } else
+ } else {
+ unsigned long index;
+ index = addr - offsetof(struct user, fpu);
tmp = ((unsigned long *)child->thread.xstate)
- [(addr - (unsigned long)&dummy->fpu) >> 2];
- } else if (addr == (unsigned long) &dummy->u_fpvalid)
+ [index >> 2];
+ }
+ } else if (addr == offsetof(struct user, u_fpvalid))
tmp = !!tsk_used_math(child);
else if (addr == PT_TEXT_ADDR)
tmp = child->mm->start_code;
@@ -389,13 +391,15 @@ long arch_ptrace(struct task_struct *child, long request,
if (addr < sizeof(struct pt_regs))
ret = put_stack_long(child, addr, data);
- else if (addr >= (unsigned long) &dummy->fpu &&
- addr < (unsigned long) &dummy->u_fpvalid) {
+ else if (addr >= offsetof(struct user, fpu) &&
+ addr < offsetof(struct user, u_fpvalid)) {
+ unsigned long index;
+ index = addr - offsetof(struct user, fpu);
set_stopped_child_used_math(child);
((unsigned long *)child->thread.xstate)
- [(addr - (unsigned long)&dummy->fpu) >> 2] = data;
+ [index >> 2] = data;
ret = 0;
- } else if (addr == (unsigned long) &dummy->u_fpvalid) {
+ } else if (addr == offsetof(struct user, u_fpvalid)) {
conditional_stopped_child_used_math(data, child);
ret = 0;
}
@@ -405,35 +409,35 @@ long arch_ptrace(struct task_struct *child, long request,
return copy_regset_to_user(child, &user_sh_native_view,
REGSET_GENERAL,
0, sizeof(struct pt_regs),
- (void __user *)data);
+ datap);
case PTRACE_SETREGS:
return copy_regset_from_user(child, &user_sh_native_view,
REGSET_GENERAL,
0, sizeof(struct pt_regs),
- (const void __user *)data);
+ datap);
#ifdef CONFIG_SH_FPU
case PTRACE_GETFPREGS:
return copy_regset_to_user(child, &user_sh_native_view,
REGSET_FPU,
0, sizeof(struct user_fpu_struct),
- (void __user *)data);
+ datap);
case PTRACE_SETFPREGS:
return copy_regset_from_user(child, &user_sh_native_view,
REGSET_FPU,
0, sizeof(struct user_fpu_struct),
- (const void __user *)data);
+ datap);
#endif
#ifdef CONFIG_SH_DSP
case PTRACE_GETDSPREGS:
return copy_regset_to_user(child, &user_sh_native_view,
REGSET_DSP,
0, sizeof(struct pt_dspregs),
- (void __user *)data);
+ datap);
case PTRACE_SETDSPREGS:
return copy_regset_from_user(child, &user_sh_native_view,
REGSET_DSP,
0, sizeof(struct pt_dspregs),
- (const void __user *)data);
+ datap);
#endif
default:
ret = ptrace_request(child, request, addr, data);
diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c
index c2c2ed5..5a33fac 100644
--- a/arch/sh/kernel/ptrace_64.c
+++ b/arch/sh/kernel/ptrace_64.c
@@ -308,6 +308,7 @@ long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret;
+ unsigned long __user *datap = (unsigned long __user *) data;
switch (request) {
/* read the word at location addr in the USER area. */
@@ -322,13 +323,14 @@ long arch_ptrace(struct task_struct *child, long request,
tmp = get_stack_long(child, addr);
else if ((addr >= offsetof(struct user, fpu)) &&
(addr < offsetof(struct user, u_fpvalid))) {
- tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
+ unsigned long index = addr - offsetof(struct user, fpu);
+ tmp = get_fpu_long(child, index);
} else if (addr == offsetof(struct user, u_fpvalid)) {
tmp = !!tsk_used_math(child);
} else {
break;
}
- ret = put_user(tmp, (unsigned long *)data);
+ ret = put_user(tmp, datap);
break;
}
@@ -359,7 +361,8 @@ long arch_ptrace(struct task_struct *child, long request,
}
else if ((addr >= offsetof(struct user, fpu)) &&
(addr < offsetof(struct user, u_fpvalid))) {
- ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
+ unsigned long index = addr - offsetof(struct user, fpu);
+ ret = put_fpu_long(child, index, data);
}
break;
@@ -367,23 +370,23 @@ long arch_ptrace(struct task_struct *child, long request,
return copy_regset_to_user(child, &user_sh64_native_view,
REGSET_GENERAL,
0, sizeof(struct pt_regs),
- (void __user *)data);
+ datap);
case PTRACE_SETREGS:
return copy_regset_from_user(child, &user_sh64_native_view,
REGSET_GENERAL,
0, sizeof(struct pt_regs),
- (const void __user *)data);
+ datap);
#ifdef CONFIG_SH_FPU
case PTRACE_GETFPREGS:
return copy_regset_to_user(child, &user_sh64_native_view,
REGSET_FPU,
0, sizeof(struct user_fpu_struct),
- (void __user *)data);
+ datap);
case PTRACE_SETFPREGS:
return copy_regset_from_user(child, &user_sh64_native_view,
REGSET_FPU,
0, sizeof(struct user_fpu_struct),
- (const void __user *)data);
+ datap);
#endif
default:
ret = ptrace_request(child, request, addr, data);
--
1.7.2.2
--
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