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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
- .set push
- SET_HARDFLOAT
- /* 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)
- .set pop /* SET_HARDFLOAT */
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