diff options
| author | Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2015-06-11 15:33:54 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-07-22 09:58:00 +0200 |
| commit | 904818e2f229f3d94ec95f6932a6358c81e73d78 (patch) | |
| tree | 8e08f576b000b18b181b617cd0d12a6649a26556 /arch/s390/kernel/traps.c | |
| parent | 96b2d7a83a27fbae10fc57c39577a7e2689d9f0a (diff) | |
s390/kernel: introduce fpu-internal.h with fpu helper functions
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>
Diffstat (limited to 'arch/s390/kernel/traps.c')
| -rw-r--r-- | arch/s390/kernel/traps.c | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index 7bea81d8a363..97598d1876c7 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -19,7 +19,7 @@ #include <linux/sched.h> #include <linux/mm.h> #include <linux/slab.h> -#include <asm/switch_to.h> +#include <asm/fpu-internal.h> #include "entry.h" int show_unhandled_signals = 1; @@ -227,7 +227,6 @@ DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN, int alloc_vector_registers(struct task_struct *tsk) { __vector128 *vxrs; - int i; /* Allocate vector register save area. */ vxrs = kzalloc(sizeof(__vector128) * __NUM_VXRS, @@ -236,11 +235,10 @@ int alloc_vector_registers(struct task_struct *tsk) return -ENOMEM; preempt_disable(); if (tsk == current) - save_fp_regs(tsk->thread.fp_regs.fprs); + save_fp_regs(tsk->thread.fpu.fprs); /* Copy the 16 floating point registers */ - for (i = 0; i < 16; i++) - *(freg_t *) &vxrs[i] = tsk->thread.fp_regs.fprs[i]; - tsk->thread.vxrs = vxrs; + convert_fp_to_vx(vxrs, tsk->thread.fpu.fprs); + tsk->thread.fpu.vxrs = vxrs; if (tsk == current) { __ctl_set_bit(0, 17); restore_vx_regs(vxrs); @@ -259,8 +257,8 @@ void vector_exception(struct pt_regs *regs) } /* get vector interrupt code from fpc */ - asm volatile("stfpc %0" : "=Q" (current->thread.fp_regs.fpc)); - vic = (current->thread.fp_regs.fpc & 0xf00) >> 8; + asm volatile("stfpc %0" : "=Q" (current->thread.fpu.fpc)); + vic = (current->thread.fpu.fpc & 0xf00) >> 8; switch (vic) { case 1: /* invalid vector operation */ si_code = FPE_FLTINV; @@ -297,22 +295,22 @@ void data_exception(struct pt_regs *regs) location = get_trap_ip(regs); - asm volatile("stfpc %0" : "=Q" (current->thread.fp_regs.fpc)); + asm volatile("stfpc %0" : "=Q" (current->thread.fpu.fpc)); /* Check for vector register enablement */ - if (MACHINE_HAS_VX && !current->thread.vxrs && - (current->thread.fp_regs.fpc & FPC_DXC_MASK) == 0xfe00) { + if (MACHINE_HAS_VX && !is_vx_task(current) && + (current->thread.fpu.fpc & FPC_DXC_MASK) == 0xfe00) { alloc_vector_registers(current); /* Vector data exception is suppressing, rewind psw. */ regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16); clear_pt_regs_flag(regs, PIF_PER_TRAP); return; } - if (current->thread.fp_regs.fpc & FPC_DXC_MASK) + if (current->thread.fpu.fpc & FPC_DXC_MASK) signal = SIGFPE; else signal = SIGILL; if (signal == SIGFPE) - do_fp_trap(regs, current->thread.fp_regs.fpc); + do_fp_trap(regs, current->thread.fpu.fpc); else if (signal) do_trap(regs, signal, ILL_ILLOPN, "data exception"); } |