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/*
* r6000_fpu.S: Save/restore floating point context for signal handlers.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1996 by Ralf Baechle
*
* Multi-arch abstraction and asm macros for easier reading:
* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
*/
#include <asm/asm.h>
#include <asm/fpregdef.h>
#include <asm/mipsregs.h>
#include <asm/asm-offsets.h>
#include <asm/regdef.h>
.set noreorder
.set mips2
/* Save floating point context */
LEAF(_save_fp_context)
mfc0 t0,CP0_STATUS
sll t0,t0,2
bgez t0,1f
nop
cfc1 t1,fcr31
/* Store the 16 double precision registers */
sdc1 $f0,(SC_FPREGS+0)(a0)
sdc1 $f2,(SC_FPREGS+16)(a0)
sdc1 $f4,(SC_FPREGS+32)(a0)
sdc1 $f6,(SC_FPREGS+48)(a0)
sdc1 $f8,(SC_FPREGS+64)(a0)
sdc1 $f10,(SC_FPREGS+80)(a0)
sdc1 $f12,(SC_FPREGS+96)(a0)
sdc1 $f14,(SC_FPREGS+112)(a0)
sdc1 $f16,(SC_FPREGS+128)(a0)
sdc1 $f18,(SC_FPREGS+144)(a0)
sdc1 $f20,(SC_FPREGS+160)(a0)
sdc1 $f22,(SC_FPREGS+176)(a0)
sdc1 $f24,(SC_FPREGS+192)(a0)
sdc1 $f26,(SC_FPREGS+208)(a0)
sdc1 $f28,(SC_FPREGS+224)(a0)
sdc1 $f30,(SC_FPREGS+240)(a0)
jr ra
sw t0,SC_FPC_CSR(a0)
1: jr ra
nop
END(_save_fp_context)
/* Restore FPU state:
* - fp gp registers
* - cp1 status/control register
*
* We base the decision which registers to restore from the signal stack
* frame on the current content of c0_status, not on the content of the
* stack frame which might have been changed by the user.
*/
LEAF(_restore_fp_context)
mfc0 t0,CP0_STATUS
sll t0,t0,2
bgez t0,1f
lw t0,SC_FPC_CSR(a0)
/* Restore the 16 double precision registers */
ldc1 $f0,(SC_FPREGS+0)(a0)
ldc1 $f2,(SC_FPREGS+16)(a0)
ldc1 $f4,(SC_FPREGS+32)(a0)
ldc1 $f6,(SC_FPREGS+48)(a0)
ldc1 $f8,(SC_FPREGS+64)(a0)
ldc1 $f10,(SC_FPREGS+80)(a0)
ldc1 $f12,(SC_FPREGS+96)(a0)
ldc1 $f14,(SC_FPREGS+112)(a0)
ldc1 $f16,(SC_FPREGS+128)(a0)
ldc1 $f18,(SC_FPREGS+144)(a0)
ldc1 $f20,(SC_FPREGS+160)(a0)
ldc1 $f22,(SC_FPREGS+176)(a0)
ldc1 $f24,(SC_FPREGS+192)(a0)
ldc1 $f26,(SC_FPREGS+208)(a0)
ldc1 $f28,(SC_FPREGS+224)(a0)
ldc1 $f30,(SC_FPREGS+240)(a0)
jr ra
ctc1 t0,fcr31
1: jr ra
nop
END(_restore_fp_context)
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