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/** 25 * _save_fp_context() - save FP context from the FPU 26 * @a0 - pointer to fpregs field of sigcontext 27 * @a1 - pointer to fpc_csr field of sigcontext 28 * 29 * Save FP context, including the 32 FP data registers and the FP 30 * control & status register, from the FPU to signal context. 31 */ 32 LEAF(_save_fp_context) 33 mfc0 t0,CP0_STATUS 34 sll t0,t0,2 35 bgez t0,1f 36 nop 37 38 cfc1 t1,fcr31 39 /* Store the 16 double precision registers */ 40 sdc1 $f0,0(a0) 41 sdc1 $f2,16(a0) 42 sdc1 $f4,32(a0) 43 sdc1 $f6,48(a0) 44 sdc1 $f8,64(a0) 45 sdc1 $f10,80(a0) 46 sdc1 $f12,96(a0) 47 sdc1 $f14,112(a0) 48 sdc1 $f16,128(a0) 49 sdc1 $f18,144(a0) 50 sdc1 $f20,160(a0) 51 sdc1 $f22,176(a0) 52 sdc1 $f24,192(a0) 53 sdc1 $f26,208(a0) 54 sdc1 $f28,224(a0) 55 sdc1 $f30,240(a0) 56 jr ra 57 sw t0,(a1) 581: jr ra 59 nop 60 END(_save_fp_context) 61 62/** 63 * _restore_fp_context() - restore FP context to the FPU 64 * @a0 - pointer to fpregs field of sigcontext 65 * @a1 - pointer to fpc_csr field of sigcontext 66 * 67 * Restore FP context, including the 32 FP data registers and the FP 68 * control & status register, from signal context to the FPU. 69 */ 70 LEAF(_restore_fp_context) 71 mfc0 t0,CP0_STATUS 72 sll t0,t0,2 73 74 bgez t0,1f 75 lw t0,(a1) 76 /* Restore the 16 double precision registers */ 77 ldc1 $f0,0(a0) 78 ldc1 $f2,16(a0) 79 ldc1 $f4,32(a0) 80 ldc1 $f6,48(a0) 81 ldc1 $f8,64(a0) 82 ldc1 $f10,80(a0) 83 ldc1 $f12,96(a0) 84 ldc1 $f14,112(a0) 85 ldc1 $f16,128(a0) 86 ldc1 $f18,144(a0) 87 ldc1 $f20,160(a0) 88 ldc1 $f22,176(a0) 89 ldc1 $f24,192(a0) 90 ldc1 $f26,208(a0) 91 ldc1 $f28,224(a0) 92 ldc1 $f30,240(a0) 93 jr ra 94 ctc1 t0,fcr31 951: jr ra 96 nop 97 END(_restore_fp_context) 98 99 .set pop /* SET_HARDFLOAT */ 100