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Diffstat (limited to 'arch/s390/kernel/process.c')
-rw-r--r--arch/s390/kernel/process.c52
1 files changed, 42 insertions, 10 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 8f587d871..f2dac9f07 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -81,8 +81,38 @@ void release_thread(struct task_struct *dead_task)
void arch_release_task_struct(struct task_struct *tsk)
{
- if (tsk->thread.vxrs)
- kfree(tsk->thread.vxrs);
+ /* Free either the floating-point or the vector register save area */
+ kfree(tsk->thread.fpu.regs);
+}
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+ *dst = *src;
+
+ /* Set up a new floating-point register save area */
+ dst->thread.fpu.fpc = 0;
+ dst->thread.fpu.flags = 0; /* Always start with VX disabled */
+ dst->thread.fpu.fprs = kzalloc(sizeof(freg_t) * __NUM_FPRS,
+ GFP_KERNEL|__GFP_REPEAT);
+ if (!dst->thread.fpu.fprs)
+ return -ENOMEM;
+
+ /*
+ * Save the floating-point or vector register state of the current
+ * task. The state is not saved for early kernel threads, for example,
+ * the init_task, which do not have an allocated save area.
+ * The CIF_FPU flag is set in any case to lazy clear or restore a saved
+ * state when switching to a different task or returning to user space.
+ */
+ save_fpu_regs();
+ dst->thread.fpu.fpc = current->thread.fpu.fpc;
+ if (is_vx_task(current))
+ convert_vx_to_fp(dst->thread.fpu.fprs,
+ current->thread.fpu.vxrs);
+ else
+ memcpy(dst->thread.fpu.fprs, current->thread.fpu.fprs,
+ sizeof(freg_t) * __NUM_FPRS);
+ return 0;
}
int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
@@ -142,11 +172,6 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
p->thread.ri_signum = 0;
frame->childregs.psw.mask &= ~PSW_MASK_RI;
- /* Save the fpu registers to new thread structure. */
- save_fp_ctl(&p->thread.fp_regs.fpc);
- save_fp_regs(p->thread.fp_regs.fprs);
- p->thread.fp_regs.pad = 0;
- p->thread.vxrs = NULL;
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS) {
unsigned long tls = frame->childregs.gprs[6];
@@ -162,7 +187,7 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
asmlinkage void execve_tail(void)
{
- current->thread.fp_regs.fpc = 0;
+ current->thread.fpu.fpc = 0;
asm volatile("sfpc %0" : : "d" (0));
}
@@ -171,8 +196,15 @@ asmlinkage void execve_tail(void)
*/
int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
{
- save_fp_ctl(&fpregs->fpc);
- save_fp_regs(fpregs->fprs);
+ save_fpu_regs();
+ fpregs->fpc = current->thread.fpu.fpc;
+ fpregs->pad = 0;
+ if (is_vx_task(current))
+ convert_vx_to_fp((freg_t *)&fpregs->fprs,
+ current->thread.fpu.vxrs);
+ else
+ memcpy(&fpregs->fprs, current->thread.fpu.fprs,
+ sizeof(fpregs->fprs));
return 1;
}
EXPORT_SYMBOL(dump_fpu);