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[ia64] access_uarea(): don't bother with fpregs_[gs]et()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-06-06 20:22:32 -04:00
parent 6bc4f16c6c
commit e3fdfa37a3
1 changed files with 33 additions and 9 deletions
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42
arch/ia64/kernel/ptrace.c
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@ -1811,7 +1811,6 @@ access_uarea(struct task_struct *child, unsigned long addr,
unsigned long *data, int write_access)
{
unsigned int pos = -1; /* an invalid value */
int ret;
unsigned long *ptr, regnum;
if ((addr & 0x7) != 0) {
@ -1843,14 +1842,39 @@ access_uarea(struct task_struct *child, unsigned long addr,
}
if (pos != -1) {
if (write_access)
ret = fpregs_set(child, NULL, pos,
sizeof(unsigned long), data, NULL);
else
ret = fpregs_get(child, NULL, pos,
sizeof(unsigned long), data, NULL);
if (ret != 0)
return -1;
unsigned reg = pos / sizeof(elf_fpreg_t);
int which_half = (pos / sizeof(unsigned long)) & 1;
if (reg < 32) { /* fr2-fr31 */
struct unw_frame_info info;
elf_fpreg_t fpreg;
memset(&info, 0, sizeof(info));
unw_init_from_blocked_task(&info, child);
if (unw_unwind_to_user(&info) < 0)
return 0;
if (unw_get_fr(&info, reg, &fpreg))
return -1;
if (write_access) {
fpreg.u.bits[which_half] = *data;
if (unw_set_fr(&info, reg, fpreg))
return -1;
} else {
*data = fpreg.u.bits[which_half];
}
} else { /* fph */
elf_fpreg_t *p = &child->thread.fph[reg - 32];
unsigned long *bits = &p->u.bits[which_half];
ia64_sync_fph(child);
if (write_access)
*bits = *data;
else if (child->thread.flags & IA64_THREAD_FPH_VALID)
*data = *bits;
else
*data = 0;
}
return 0;
}