1 /* $NetBSD: fpu_fstore.c,v 1.17 2025/01/06 06:14:17 isaki Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Ken Nakata 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: fpu_fstore.c,v 1.17 2025/01/06 06:14:17 isaki Exp $"); 30 31 #include <sys/types.h> 32 #include <sys/signal.h> 33 #include <sys/systm.h> 34 #include <machine/frame.h> 35 36 #include "fpu_emulate.h" 37 38 /* 39 * type 0: fmove mem/fpr->fpr 40 * In this function, we know 41 * (opcode & 0x01c0) == 0 42 * (word1 & 0xe000) == 0x6000 43 */ 44 int 45 fpu_emul_fstore(struct fpemu *fe, struct instruction *insn) 46 { 47 struct frame *frame = fe->fe_frame; 48 uint32_t *fpregs = fe->fe_fpframe->fpf_regs; 49 int word1, sig; 50 int regnum; 51 int format; 52 int modreg; 53 uint32_t buf[3]; 54 55 #if DEBUG_FPE 56 printf(" fpu_emul_fstore: frame at %p fpframe at %p\n", 57 frame, fe->fe_fpframe); 58 #endif 59 60 word1 = insn->is_word1; 61 format = (word1 >> 10) & 7; 62 regnum = (word1 >> 7) & 7; 63 64 if (format == FTYPE_DBL) { 65 insn->is_datasize = 8; 66 } else if (format == FTYPE_SNG || format == FTYPE_LNG) { 67 insn->is_datasize = 4; 68 } else if (format == FTYPE_WRD) { 69 insn->is_datasize = 2; 70 format = FTYPE_LNG; 71 } else if (format == FTYPE_BYT) { 72 insn->is_datasize = 1; 73 format = FTYPE_LNG; 74 } else if (format == FTYPE_EXT) { 75 insn->is_datasize = 12; 76 } else { 77 /* invalid or unsupported operand format */ 78 #if DEBUG_FPE 79 printf(" fpu_emul_fstore: invalid format %d\n", format); 80 #endif 81 return SIGFPE; 82 } 83 #if DEBUG_FPE 84 printf(" fpu_emul_fstore: format %d, size %d\n", 85 format, insn->is_datasize); 86 #endif 87 88 fe->fe_fpsr &= ~FPSR_EXCP; 89 90 /* Check an illegal mod/reg */ 91 modreg = insn->is_opcode & 077; 92 if ((modreg >> 3) == 1/*An*/ || modreg >= 072/*PCrel and #imm*/) { 93 #if DEBUG_FPE 94 printf(" fpu_emul_fstore: illegal modreg=0%o\n", modreg); 95 #endif 96 return SIGILL; 97 } 98 99 /* Get effective address. */ 100 sig = fpu_decode_ea(frame, insn, &insn->is_ea, modreg); 101 if (sig) { 102 #if DEBUG_FPE 103 printf(" fpu_emul_fstore: failed in decode_ea sig=%d\n", sig); 104 #endif 105 return sig; 106 } 107 108 if (insn->is_datasize > 4 && insn->is_ea.ea_flags == EA_DIRECT) { 109 /* trying to store dbl or ext into a data register */ 110 #ifdef DEBUG 111 printf(" fpu_fstore: attempted to store dbl/ext to reg\n"); 112 #endif 113 return SIGILL; 114 } 115 116 #if DEBUG_FPE 117 printf(" fpu_emul_fstore: saving FP%d (%08x,%08x,%08x)\n", 118 regnum, fpregs[regnum * 3], fpregs[regnum * 3 + 1], 119 fpregs[regnum * 3 + 2]); 120 #endif 121 fpu_explode(fe, &fe->fe_f3, FTYPE_EXT, &fpregs[regnum * 3]); 122 #if DEBUG_FPE 123 { 124 static const char *class_name[] = 125 { "SNAN", "QNAN", "ZERO", "NUM", "INF" }; 126 printf(" fpu_emul_fstore: fpn (%s,%c,%d,%08x,%08x,%08x)\n", 127 class_name[fe->fe_f3.fp_class + 2], 128 fe->fe_f3.fp_sign ? '-' : '+', fe->fe_f3.fp_exp, 129 fe->fe_f3.fp_mant[0], fe->fe_f3.fp_mant[1], 130 fe->fe_f3.fp_mant[2]); 131 } 132 #endif 133 fpu_implode(fe, &fe->fe_f3, format, buf); 134 135 fpu_store_ea(frame, insn, &insn->is_ea, (char *)buf); 136 #if DEBUG_FPE 137 printf(" fpu_emul_fstore: %08x,%08x,%08x size %d\n", 138 buf[0], buf[1], buf[2], insn->is_datasize); 139 #endif 140 141 return 0; 142 } 143