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[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: Roland McGrath <roland@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Roland McGrath 2007-12-20 03:57:34 -08:00 committed by Paul Mackerras
parent 5ab3e84f66
commit f65255e8d5
1 changed files with 31 additions and 6 deletions
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37
arch/powerpc/kernel/ptrace.c
View File

@ -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);
}