1 2 /*---------------------------------------------------------------*/ 3 /*--- begin guest_generic_x87.h ---*/ 4 /*---------------------------------------------------------------*/ 5 6 /* 7 This file is part of Valgrind, a dynamic binary instrumentation 8 framework. 9 10 Copyright (C) 2004-2011 OpenWorks LLP 11 info (at) open-works.net 12 13 This program is free software; you can redistribute it and/or 14 modify it under the terms of the GNU General Public License as 15 published by the Free Software Foundation; either version 2 of the 16 License, or (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, but 19 WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 26 02110-1301, USA. 27 28 The GNU General Public License is contained in the file COPYING. 29 30 Neither the names of the U.S. Department of Energy nor the 31 University of California nor the names of its contributors may be 32 used to endorse or promote products derived from this software 33 without prior written permission. 34 */ 35 36 /* This file contains functions for doing some x87-specific 37 operations. Both the amd64 and x86 front ends (guests) indirectly 38 call these functions via guest helper calls. By putting them here, 39 code duplication is avoided. Some of these functions are tricky 40 and hard to verify, so there is much to be said for only having one 41 copy thereof. 42 */ 43 44 #ifndef __VEX_GUEST_GENERIC_X87_H 45 #define __VEX_GUEST_GENERIC_X87_H 46 47 #include "libvex_basictypes.h" 48 49 50 /* Convert an IEEE754 double (64-bit) into an x87 extended double 51 (80-bit), mimicing the hardware fairly closely. Both numbers are 52 stored little-endian. Limitations, all of which could be fixed, 53 given some level of hassle: 54 55 * Identity of NaNs is not preserved. 56 57 See comments in the code for more details. 58 */ 59 extern 60 void convert_f64le_to_f80le ( /*IN*/UChar* f64, /*OUT*/UChar* f80 ); 61 62 63 /* Convert an x87 extended double (80-bit) into an IEEE 754 double 64 (64-bit), mimicking the hardware fairly closely. Both numbers are 65 stored little-endian. Limitations, both of which could be fixed, 66 given some level of hassle: 67 68 * Rounding following truncation could be a bit better. 69 70 * Identity of NaNs is not preserved. 71 72 See comments in the code for more details. 73 */ 74 extern 75 void convert_f80le_to_f64le ( /*IN*/UChar* f80, /*OUT*/UChar* f64 ); 76 77 78 /* Layout of the real x87 state. */ 79 typedef 80 struct { 81 UShort env[14]; 82 UChar reg[80]; 83 } 84 Fpu_State; 85 86 /* Offsets, in 16-bit ints, into the FPU environment (env) area. */ 87 #define FP_ENV_CTRL 0 88 #define FP_ENV_STAT 2 89 #define FP_ENV_TAG 4 90 #define FP_ENV_IP 6 /* and 7 */ 91 #define FP_ENV_CS 8 92 #define FP_ENV_OPOFF 10 /* and 11 */ 93 #define FP_ENV_OPSEL 12 94 #define FP_REG(ii) (10*(7-(ii))) 95 96 97 /* Do the computations for x86/amd64 FXTRACT. Called directly from 98 generated code. CLEAN HELPER. */ 99 extern ULong x86amd64g_calculate_FXTRACT ( ULong arg, HWord getExp ); 100 101 /* Compute result and new OSZACP flags for all PCMP{E,I}STR{I,M} 102 variants. See bigger comment on implementation of this function 103 for details on call/return conventions. */ 104 extern Bool compute_PCMPxSTRx ( /*OUT*/V128* resV, 105 /*OUT*/UInt* resOSZACP, 106 V128* argLV, V128* argRV, 107 UInt zmaskL, UInt zmaskR, 108 UInt imm8, Bool isxSTRM ); 109 110 #endif /* ndef __VEX_GUEST_GENERIC_X87_H */ 111 112 /*---------------------------------------------------------------*/ 113 /*--- end guest_generic_x87.h ---*/ 114 /*---------------------------------------------------------------*/ 115
