Commit 02ef691f authored by Al Viro's avatar Al Viro Committed by Linus Torvalds
Browse files

[PATCH] arm26: task_pt_regs() 



Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 697102cd

arch/arm26/kernel/process.c

+1 −2
Original line number Diff line number Diff line
@@ -278,9 +278,8 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start, 
	    unsigned long unused, struct task_struct *p, struct pt_regs *regs)

{

	struct thread_info *thread = task_thread_info(p);

	struct pt_regs *childregs;

	struct pt_regs *childregs = task_pt_regs(p);



	childregs = __get_user_regs(thread);

	*childregs = *regs;

	childregs->ARM_r0 = 0;

	childregs->ARM_sp = stack_start;

arch/arm26/kernel/ptrace.c

+5 −20
Original line number Diff line number Diff line
@@ -39,21 +39,6 @@ 
 */

#define BREAKINST_ARM	0xef9f0001



/*

 * 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 __get_user_regs(task->thread_info);

}



/*

 * 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.
@@ -62,7 +47,7 @@ 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];

}



/*
@@ -74,7 +59,7 @@ 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;
@@ -377,7 +362,7 @@ 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);



	res = read_instr(child, pc, &insn);
@@ -500,7 +485,7 @@ static int ptrace_write_user(struct task_struct *tsk, unsigned long off, 
 */

static int ptrace_getregs(struct task_struct *tsk, void *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;

}
@@ -515,7 +500,7 @@ static int ptrace_setregs(struct task_struct *tsk, void *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)) {

include/asm-arm26/thread_info.h

+1 −1
Original line number Diff line number Diff line
@@ -82,7 +82,7 @@ static inline struct thread_info *current_thread_info(void) 


/* FIXME - PAGE_SIZE < 32K */

#define THREAD_SIZE		(8*32768) // FIXME - this needs attention (see kernel/fork.c which gets a nice div by zero if this is lower than 8*32768

#define __get_user_regs(x) (((struct pt_regs *)((unsigned long)(x) + THREAD_SIZE - 8)) - 1)

#define task_pt_regs(task) ((struct pt_regs *)((unsigned long)(task)->thread_info + THREAD_SIZE - 8) - 1)



extern struct thread_info *alloc_thread_info(struct task_struct *task);

extern void free_thread_info(struct thread_info *);