diff options
Diffstat (limited to 'arch/mips/kernel/r6000_fpu.S')
| -rw-r--r-- | arch/mips/kernel/r6000_fpu.S | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/mips/kernel/r6000_fpu.S b/arch/mips/kernel/r6000_fpu.S new file mode 100644 index 00000000000..d8d3b13fe57 --- /dev/null +++ b/arch/mips/kernel/r6000_fpu.S @@ -0,0 +1,87 @@ +/* + * 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 (dm@engr.sgi.com) + */ +#include <asm/asm.h> +#include <asm/fpregdef.h> +#include <asm/mipsregs.h> +#include <asm/offset.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) |