From 815d5ec86eb8d5f57e5e4aa147bd1fb6338c58ac Mon Sep 17 00:00:00 2001
From: Al Viro <viro@ftp.linux.org.uk>
Date: Thu, 12 Jan 2006 01:05:57 -0800
Subject: [PATCH] arm: task_pt_regs()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
arch/arm/kernel/process.c | 5 ++---
arch/arm/kernel/ptrace.c | 27 +++++----------------------
2 files changed, 7 insertions(+), 25 deletions(-)
(limited to 'arch/arm')
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 46d0984b44ff..91d107d33c8d 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -355,10 +355,9 @@ int
copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start,
unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs)
{
- struct thread_info *thread = p->thread_info;
- struct pt_regs *childregs;
+ struct thread_info *thread = task_thread_info(p);
+ struct pt_regs *childregs = task_pt_regs(p);
- childregs = (void *)thread + THREAD_START_SP - sizeof(*regs);
*childregs = *regs;
childregs->ARM_r0 = 0;
childregs->ARM_sp = stack_start;
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index f003062c9457..e591f72bcdeb 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -54,23 +54,6 @@
#define BREAKINST_THUMB 0xde01
#endif
-/*
- * 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 -
- 8 - sizeof(struct pt_regs));
-}
-
/*
* this routine will get a word off of the processes privileged stack.
* the offset is how far from the base addr as stored in the THREAD.
@@ -79,7 +62,7 @@ get_user_regs(struct task_struct *task)
*/
static inline long get_user_reg(struct task_struct *task, int offset)
{
- return get_user_regs(task)->uregs[offset];
+ return task_pt_regs(task)->uregs[offset];
}
/*
@@ -91,7 +74,7 @@ static inline long get_user_reg(struct task_struct *task, int offset)
static inline int
put_user_reg(struct task_struct *task, int offset, long data)
{
- struct pt_regs newregs, *regs = get_user_regs(task);
+ struct pt_regs newregs, *regs = task_pt_regs(task);
int ret = -EINVAL;
newregs = *regs;
@@ -421,7 +404,7 @@ void ptrace_set_bpt(struct task_struct *child)
u32 insn;
int res;
- regs = get_user_regs(child);
+ regs = task_pt_regs(child);
pc = instruction_pointer(regs);
if (thumb_mode(regs)) {
@@ -572,7 +555,7 @@ 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;
}
@@ -587,7 +570,7 @@ 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);
ret = -EINVAL;
if (valid_user_regs(&newregs)) {
--
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