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[PATCH] arm: task_pt_regs()

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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>
This commit is contained in:
Al Viro 2006-01-12 01:05:57 -08:00 committed by Linus Torvalds
parent e7c1b32fd3
commit 815d5ec86e
3 changed files with 12 additions and 28 deletions
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5
arch/arm/kernel/process.c
View File

@ -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;

27
arch/arm/kernel/ptrace.c
View File

@ -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)) {

8
include/asm-arm/processor.h
View File

@ -85,9 +85,11 @@ unsigned long get_wchan(struct task_struct *p);
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
#define KSTK_REGS(tsk) (((struct pt_regs *)(THREAD_START_SP + (unsigned long)(tsk)->thread_info)) - 1)
#define KSTK_EIP(tsk) KSTK_REGS(tsk)->ARM_pc
#define KSTK_ESP(tsk) KSTK_REGS(tsk)->ARM_sp
#define task_pt_regs(p) \
((struct pt_regs *)(THREAD_START_SP + (void *)(p)->thread_info) - 1)
#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
/*
* Prefetching support - only ARMv5.