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s390/kernel: introduce fpu-internal.h with fpu helper functions

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Introduce a new structure to manage FP and VX registers. Refactor the
save and restore of floating point and vector registers with a set
of helper functions in fpu-internal.h.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner
2015-06-11 15:33:54 +02:00
committed by Martin Schwidefsky
parent 96b2d7a83a
commit 904818e2f2
9 changed files with 298 additions and 284 deletions
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42
arch/s390/kernel/signal.c
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@@ -105,32 +105,14 @@ struct rt_sigframe
static void store_sigregs(void)
{
save_access_regs(current->thread.acrs);
save_fp_ctl(&current->thread.fp_regs.fpc);
if (current->thread.vxrs) {
int i;
save_vx_regs(current->thread.vxrs);
for (i = 0; i < __NUM_FPRS; i++)
current->thread.fp_regs.fprs[i] =
*(freg_t *)(current->thread.vxrs + i);
} else
save_fp_regs(current->thread.fp_regs.fprs);
save_fpu_regs(&current->thread.fpu);
}
/* Load registers after signal return */
static void load_sigregs(void)
{
restore_access_regs(current->thread.acrs);
restore_fp_ctl(&current->thread.fp_regs.fpc);
if (current->thread.vxrs) {
int i;
for (i = 0; i < __NUM_FPRS; i++)
*(freg_t *)(current->thread.vxrs + i) =
current->thread.fp_regs.fprs[i];
restore_vx_regs(current->thread.vxrs);
} else
restore_fp_regs(current->thread.fp_regs.fprs);
restore_fpu_regs(&current->thread.fpu);
}
/* Returns non-zero on fault. */
@@ -146,8 +128,7 @@ static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
memcpy(&user_sregs.regs.gprs, &regs->gprs, sizeof(sregs->regs.gprs));
memcpy(&user_sregs.regs.acrs, current->thread.acrs,
sizeof(user_sregs.regs.acrs));
memcpy(&user_sregs.fpregs, &current->thread.fp_regs,
sizeof(user_sregs.fpregs));
fpregs_store(&user_sregs.fpregs, &current->thread.fpu);
if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs)))
return -EFAULT;
return 0;
@@ -185,8 +166,7 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
memcpy(&current->thread.acrs, &user_sregs.regs.acrs,
sizeof(current->thread.acrs));
memcpy(&current->thread.fp_regs, &user_sregs.fpregs,
sizeof(current->thread.fp_regs));
fpregs_load(&user_sregs.fpregs, &current->thread.fpu);
clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
return 0;
@@ -200,13 +180,13 @@ static int save_sigregs_ext(struct pt_regs *regs,
int i;
/* Save vector registers to signal stack */
if (current->thread.vxrs) {
if (is_vx_task(current)) {
for (i = 0; i < __NUM_VXRS_LOW; i++)
vxrs[i] = *((__u64 *)(current->thread.vxrs + i) + 1);
vxrs[i] = *((__u64 *)(current->thread.fpu.vxrs + i) + 1);
if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
sizeof(sregs_ext->vxrs_low)) ||
__copy_to_user(&sregs_ext->vxrs_high,
current->thread.vxrs + __NUM_VXRS_LOW,
current->thread.fpu.vxrs + __NUM_VXRS_LOW,
sizeof(sregs_ext->vxrs_high)))
return -EFAULT;
}
@@ -220,15 +200,15 @@ static int restore_sigregs_ext(struct pt_regs *regs,
int i;
/* Restore vector registers from signal stack */
if (current->thread.vxrs) {
if (is_vx_task(current)) {
if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
sizeof(sregs_ext->vxrs_low)) ||
__copy_from_user(current->thread.vxrs + __NUM_VXRS_LOW,
__copy_from_user(current->thread.fpu.vxrs + __NUM_VXRS_LOW,
&sregs_ext->vxrs_high,
sizeof(sregs_ext->vxrs_high)))
return -EFAULT;
for (i = 0; i < __NUM_VXRS_LOW; i++)
*((__u64 *)(current->thread.vxrs + i) + 1) = vxrs[i];
*((__u64 *)(current->thread.fpu.vxrs + i) + 1) = vxrs[i];
}
return 0;
}
@@ -400,7 +380,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
uc_flags = 0;
if (MACHINE_HAS_VX) {
frame_size += sizeof(_sigregs_ext);
if (current->thread.vxrs)
if (is_vx_task(current))
uc_flags |= UC_VXRS;
}
frame = get_sigframe(&ksig->ka, regs, frame_size);