1/* 2 * r6000_fpu.S: Save/restore floating point context for signal handlers. 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 1996 by Ralf Baechle 9 * 10 * Multi-arch abstraction and asm macros for easier reading: 11 * Copyright (C) 1996 David S. Miller (davem@davemloft.net) 12 */ 13#include <asm/asm.h> 14#include <asm/fpregdef.h> 15#include <asm/mipsregs.h> 16#include <asm/asm-offsets.h> 17#include <asm/regdef.h> 18 19 .set noreorder 20 .set mips2 21 .set push 22 SET_HARDFLOAT 23 24 /* Save floating point context */ 25 LEAF(_save_fp_context) 26 mfc0 t0,CP0_STATUS 27 sll t0,t0,2 28 bgez t0,1f 29 nop 30 31 cfc1 t1,fcr31 32 /* Store the 16 double precision registers */ 33 sdc1 $f0,(SC_FPREGS+0)(a0) 34 sdc1 $f2,(SC_FPREGS+16)(a0) 35 sdc1 $f4,(SC_FPREGS+32)(a0) 36 sdc1 $f6,(SC_FPREGS+48)(a0) 37 sdc1 $f8,(SC_FPREGS+64)(a0) 38 sdc1 $f10,(SC_FPREGS+80)(a0) 39 sdc1 $f12,(SC_FPREGS+96)(a0) 40 sdc1 $f14,(SC_FPREGS+112)(a0) 41 sdc1 $f16,(SC_FPREGS+128)(a0) 42 sdc1 $f18,(SC_FPREGS+144)(a0) 43 sdc1 $f20,(SC_FPREGS+160)(a0) 44 sdc1 $f22,(SC_FPREGS+176)(a0) 45 sdc1 $f24,(SC_FPREGS+192)(a0) 46 sdc1 $f26,(SC_FPREGS+208)(a0) 47 sdc1 $f28,(SC_FPREGS+224)(a0) 48 sdc1 $f30,(SC_FPREGS+240)(a0) 49 jr ra 50 sw t0,SC_FPC_CSR(a0) 511: jr ra 52 nop 53 END(_save_fp_context) 54 55/* Restore FPU state: 56 * - fp gp registers 57 * - cp1 status/control register 58 * 59 * We base the decision which registers to restore from the signal stack 60 * frame on the current content of c0_status, not on the content of the 61 * stack frame which might have been changed by the user. 62 */ 63 LEAF(_restore_fp_context) 64 mfc0 t0,CP0_STATUS 65 sll t0,t0,2 66 67 bgez t0,1f 68 lw t0,SC_FPC_CSR(a0) 69 /* Restore the 16 double precision registers */ 70 ldc1 $f0,(SC_FPREGS+0)(a0) 71 ldc1 $f2,(SC_FPREGS+16)(a0) 72 ldc1 $f4,(SC_FPREGS+32)(a0) 73 ldc1 $f6,(SC_FPREGS+48)(a0) 74 ldc1 $f8,(SC_FPREGS+64)(a0) 75 ldc1 $f10,(SC_FPREGS+80)(a0) 76 ldc1 $f12,(SC_FPREGS+96)(a0) 77 ldc1 $f14,(SC_FPREGS+112)(a0) 78 ldc1 $f16,(SC_FPREGS+128)(a0) 79 ldc1 $f18,(SC_FPREGS+144)(a0) 80 ldc1 $f20,(SC_FPREGS+160)(a0) 81 ldc1 $f22,(SC_FPREGS+176)(a0) 82 ldc1 $f24,(SC_FPREGS+192)(a0) 83 ldc1 $f26,(SC_FPREGS+208)(a0) 84 ldc1 $f28,(SC_FPREGS+224)(a0) 85 ldc1 $f30,(SC_FPREGS+240)(a0) 86 jr ra 87 ctc1 t0,fcr31 881: jr ra 89 nop 90 END(_restore_fp_context) 91 92 .set pop /* SET_HARDFLOAT */ 93