1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1996, 1998 by Ralf Baechle 7 * 8 * Multi-arch abstraction and asm macros for easier reading: 9 * Copyright (C) 1996 David S. Miller (davem@davemloft.net) 10 * 11 * Further modifications to make this work: 12 * Copyright (c) 1998 Harald Koerfgen 13 */ 14#include <asm/asm.h> 15#include <asm/asmmacro.h> 16#include <asm/errno.h> 17#include <asm/export.h> 18#include <asm/fpregdef.h> 19#include <asm/mipsregs.h> 20#include <asm/asm-offsets.h> 21#include <asm/regdef.h> 22 23#define EX(a,b) \ 249: a,##b; \ 25 .section __ex_table,"a"; \ 26 PTR_WD 9b,fault; \ 27 .previous 28 29#define EX2(a,b) \ 309: a,##b; \ 31 .section __ex_table,"a"; \ 32 PTR_WD 9b,fault; \ 33 PTR_WD 9b+4,fault; \ 34 .previous 35 36 .set mips1 37 38/* 39 * Save a thread's fp context. 40 */ 41LEAF(_save_fp) 42EXPORT_SYMBOL(_save_fp) 43 fpu_save_single a0, t1 # clobbers t1 44 jr ra 45 END(_save_fp) 46 47/* 48 * Restore a thread's fp context. 49 */ 50LEAF(_restore_fp) 51 fpu_restore_single a0, t1 # clobbers t1 52 jr ra 53 END(_restore_fp) 54 55 .set noreorder 56 57/** 58 * _save_fp_context() - save FP context from the FPU 59 * @a0 - pointer to fpregs field of sigcontext 60 * @a1 - pointer to fpc_csr field of sigcontext 61 * 62 * Save FP context, including the 32 FP data registers and the FP 63 * control & status register, from the FPU to signal context. 64 */ 65LEAF(_save_fp_context) 66 .set push 67 .set hardfloat 68 li v0, 0 # assume success 69 cfc1 t1, fcr31 70 EX2(s.d $f0, 0(a0)) 71 EX2(s.d $f2, 16(a0)) 72 EX2(s.d $f4, 32(a0)) 73 EX2(s.d $f6, 48(a0)) 74 EX2(s.d $f8, 64(a0)) 75 EX2(s.d $f10, 80(a0)) 76 EX2(s.d $f12, 96(a0)) 77 EX2(s.d $f14, 112(a0)) 78 EX2(s.d $f16, 128(a0)) 79 EX2(s.d $f18, 144(a0)) 80 EX2(s.d $f20, 160(a0)) 81 EX2(s.d $f22, 176(a0)) 82 EX2(s.d $f24, 192(a0)) 83 EX2(s.d $f26, 208(a0)) 84 EX2(s.d $f28, 224(a0)) 85 EX2(s.d $f30, 240(a0)) 86 jr ra 87 EX(sw t1, (a1)) 88 .set pop 89 END(_save_fp_context) 90 91/** 92 * _restore_fp_context() - restore FP context to the FPU 93 * @a0 - pointer to fpregs field of sigcontext 94 * @a1 - pointer to fpc_csr field of sigcontext 95 * 96 * Restore FP context, including the 32 FP data registers and the FP 97 * control & status register, from signal context to the FPU. 98 */ 99LEAF(_restore_fp_context) 100 .set push 101 .set hardfloat 102 li v0, 0 # assume success 103 EX(lw t0, (a1)) 104 EX2(l.d $f0, 0(a0)) 105 EX2(l.d $f2, 16(a0)) 106 EX2(l.d $f4, 32(a0)) 107 EX2(l.d $f6, 48(a0)) 108 EX2(l.d $f8, 64(a0)) 109 EX2(l.d $f10, 80(a0)) 110 EX2(l.d $f12, 96(a0)) 111 EX2(l.d $f14, 112(a0)) 112 EX2(l.d $f16, 128(a0)) 113 EX2(l.d $f18, 144(a0)) 114 EX2(l.d $f20, 160(a0)) 115 EX2(l.d $f22, 176(a0)) 116 EX2(l.d $f24, 192(a0)) 117 EX2(l.d $f26, 208(a0)) 118 EX2(l.d $f28, 224(a0)) 119 EX2(l.d $f30, 240(a0)) 120 jr ra 121 ctc1 t0, fcr31 122 .set pop 123 END(_restore_fp_context) 124 .set reorder 125 126 .type fault, @function 127 .ent fault 128fault: li v0, -EFAULT 129 jr ra 130 .end fault 131