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Commit f65255e8 authored by Roland McGrath's avatar Roland McGrath Committed by Paul Mackerras
Browse files

[POWERPC] Use user_regset accessors for FP regs 



This implements user_regset-style accessors for the powerpc FPU data,
and rewrites the existing ptrace code in terms of those calls.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 5ab3e84f

arch/powerpc/kernel/ptrace.c

+31 −6
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/smp.h>

#include <linux/errno.h>

#include <linux/ptrace.h>

#include <linux/regset.h>

#include <linux/user.h>

#include <linux/security.h>

#include <linux/signal.h>
@@ -103,24 +104,48 @@ int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data) 
}





static int fpr_get(struct task_struct *target, const struct user_regset *regset,

		   unsigned int pos, unsigned int count,

		   void *kbuf, void __user *ubuf)

{

	flush_fp_to_thread(target);



	BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=

		     offsetof(struct thread_struct, fpr[32]));



	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,

				   &target->thread.fpr, 0, -1);

}



static int fpr_set(struct task_struct *target, const struct user_regset *regset,

		   unsigned int pos, unsigned int count,

		   const void *kbuf, const void __user *ubuf)

{

	flush_fp_to_thread(target);



	BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=

		     offsetof(struct thread_struct, fpr[32]));



	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,

				  &target->thread.fpr, 0, -1);

}



static int get_fpregs(void __user *data, struct task_struct *task,

		      int has_fpscr)

{

	unsigned int count = has_fpscr ? 33 : 32;



	if (copy_to_user(data, task->thread.fpr, count * sizeof(double)))

	if (!access_ok(VERIFY_WRITE, data, count * sizeof(double)))

		return -EFAULT;

	return 0;

	return fpr_get(task, NULL, 0, count * sizeof(double), NULL, data);

}



static int set_fpregs(void __user *data, struct task_struct *task,

		      int has_fpscr)

{

	unsigned int count = has_fpscr ? 33 : 32;



	if (copy_from_user(task->thread.fpr, data, count * sizeof(double)))

	if (!access_ok(VERIFY_READ, data, count * sizeof(double)))

		return -EFAULT;

	return 0;

	return fpr_set(task, NULL, 0, count * sizeof(double), NULL, data);

}