branch.isa revision 10037
16019Shines@cs.fsu.edu// -*- mode:c++ -*- 26019Shines@cs.fsu.edu 310037SARM gem5 Developers// Copyright (c) 2010, 2012-2013 ARM Limited 47152Sgblack@eecs.umich.edu// All rights reserved 57152Sgblack@eecs.umich.edu// 67152Sgblack@eecs.umich.edu// The license below extends only to copyright in the software and shall 77152Sgblack@eecs.umich.edu// not be construed as granting a license to any other intellectual 87152Sgblack@eecs.umich.edu// property including but not limited to intellectual property relating 97152Sgblack@eecs.umich.edu// to a hardware implementation of the functionality of the software 107152Sgblack@eecs.umich.edu// licensed hereunder. You may use the software subject to the license 117152Sgblack@eecs.umich.edu// terms below provided that you ensure that this notice is replicated 127152Sgblack@eecs.umich.edu// unmodified and in its entirety in all distributions of the software, 137152Sgblack@eecs.umich.edu// modified or unmodified, in source code or in binary form. 147152Sgblack@eecs.umich.edu// 156019Shines@cs.fsu.edu// Copyright (c) 2007-2008 The Florida State University 166019Shines@cs.fsu.edu// All rights reserved. 176019Shines@cs.fsu.edu// 186019Shines@cs.fsu.edu// Redistribution and use in source and binary forms, with or without 196019Shines@cs.fsu.edu// modification, are permitted provided that the following conditions are 206019Shines@cs.fsu.edu// met: redistributions of source code must retain the above copyright 216019Shines@cs.fsu.edu// notice, this list of conditions and the following disclaimer; 226019Shines@cs.fsu.edu// redistributions in binary form must reproduce the above copyright 236019Shines@cs.fsu.edu// notice, this list of conditions and the following disclaimer in the 246019Shines@cs.fsu.edu// documentation and/or other materials provided with the distribution; 256019Shines@cs.fsu.edu// neither the name of the copyright holders nor the names of its 266019Shines@cs.fsu.edu// contributors may be used to endorse or promote products derived from 276019Shines@cs.fsu.edu// this software without specific prior written permission. 286019Shines@cs.fsu.edu// 296019Shines@cs.fsu.edu// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 306019Shines@cs.fsu.edu// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 316019Shines@cs.fsu.edu// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 326019Shines@cs.fsu.edu// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 336019Shines@cs.fsu.edu// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 346019Shines@cs.fsu.edu// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 356019Shines@cs.fsu.edu// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 366019Shines@cs.fsu.edu// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 376019Shines@cs.fsu.edu// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 386019Shines@cs.fsu.edu// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 396019Shines@cs.fsu.edu// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 406019Shines@cs.fsu.edu// 416019Shines@cs.fsu.edu// Authors: Stephen Hines 426019Shines@cs.fsu.edu 436019Shines@cs.fsu.edu//////////////////////////////////////////////////////////////////// 446019Shines@cs.fsu.edu// 456019Shines@cs.fsu.edu// Control transfer instructions 466019Shines@cs.fsu.edu// 476019Shines@cs.fsu.edu 487152Sgblack@eecs.umich.edudef format ArmBBlxImm() {{ 497152Sgblack@eecs.umich.edu decode_block = ''' 507152Sgblack@eecs.umich.edu if (machInst.condCode == 0xF) { 517152Sgblack@eecs.umich.edu int32_t imm = (sext<26>(bits(machInst, 23, 0) << 2)) | 527152Sgblack@eecs.umich.edu (bits(machInst, 24) << 1); 537602SGene.Wu@arm.com return new BlxImm(machInst, imm, COND_UC); 547152Sgblack@eecs.umich.edu } else { 557152Sgblack@eecs.umich.edu return new B(machInst, sext<26>(bits(machInst, 23, 0) << 2), 567152Sgblack@eecs.umich.edu (ConditionCode)(uint32_t)machInst.condCode); 577152Sgblack@eecs.umich.edu } 587152Sgblack@eecs.umich.edu ''' 597152Sgblack@eecs.umich.edu}}; 607152Sgblack@eecs.umich.edu 617152Sgblack@eecs.umich.edudef format ArmBlBlxImm() {{ 627152Sgblack@eecs.umich.edu decode_block = ''' 637152Sgblack@eecs.umich.edu if (machInst.condCode == 0xF) { 647152Sgblack@eecs.umich.edu int32_t imm = (sext<26>(bits(machInst, 23, 0) << 2)) | 657152Sgblack@eecs.umich.edu (bits(machInst, 24) << 1); 667602SGene.Wu@arm.com return new BlxImm(machInst, imm, COND_UC); 677152Sgblack@eecs.umich.edu } else { 687152Sgblack@eecs.umich.edu return new Bl(machInst, sext<26>(bits(machInst, 23, 0) << 2), 697152Sgblack@eecs.umich.edu (ConditionCode)(uint32_t)machInst.condCode); 707152Sgblack@eecs.umich.edu } 717152Sgblack@eecs.umich.edu ''' 727152Sgblack@eecs.umich.edu}}; 737152Sgblack@eecs.umich.edu 747252Sgblack@eecs.umich.edudef format ArmBxClz() {{ 757152Sgblack@eecs.umich.edu decode_block = ''' 767252Sgblack@eecs.umich.edu { 777252Sgblack@eecs.umich.edu const IntRegIndex rm = (IntRegIndex)(uint32_t)bits(machInst, 3, 0); 787252Sgblack@eecs.umich.edu const IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 15, 12); 797252Sgblack@eecs.umich.edu if (OPCODE == 0x9) { 807252Sgblack@eecs.umich.edu return new BxReg(machInst, rm, 817252Sgblack@eecs.umich.edu (ConditionCode)(uint32_t)machInst.condCode); 827252Sgblack@eecs.umich.edu } else if (OPCODE == 0xb) { 837252Sgblack@eecs.umich.edu return new Clz(machInst, rd, rm); 847252Sgblack@eecs.umich.edu } else { 857252Sgblack@eecs.umich.edu return new Unknown(machInst); 867252Sgblack@eecs.umich.edu } 877252Sgblack@eecs.umich.edu } 887152Sgblack@eecs.umich.edu ''' 897152Sgblack@eecs.umich.edu}}; 907152Sgblack@eecs.umich.edu 917152Sgblack@eecs.umich.edudef format ArmBlxReg() {{ 927152Sgblack@eecs.umich.edu decode_block = ''' 937152Sgblack@eecs.umich.edu return new BlxReg(machInst, (IntRegIndex)(uint32_t)bits(machInst, 3, 0), 947152Sgblack@eecs.umich.edu (ConditionCode)(uint32_t)machInst.condCode); 957152Sgblack@eecs.umich.edu ''' 967152Sgblack@eecs.umich.edu}}; 977154Sgblack@eecs.umich.edu 987154Sgblack@eecs.umich.edudef format Thumb16CondBranchAndSvc() {{ 997154Sgblack@eecs.umich.edu decode_block = ''' 1007154Sgblack@eecs.umich.edu if (bits(machInst, 11, 9) != 0x7) { 1017154Sgblack@eecs.umich.edu return new B(machInst, sext<9>(bits(machInst, 7, 0) << 1), 1027154Sgblack@eecs.umich.edu (ConditionCode)(uint32_t)bits(machInst, 11, 8)); 1037154Sgblack@eecs.umich.edu } else if (bits(machInst, 8)) { 10410037SARM gem5 Developers return new Svc(machInst, bits(machInst, 7, 0)); 1057154Sgblack@eecs.umich.edu } else { 1067154Sgblack@eecs.umich.edu // This space will not be allocated in the future. 1077281Sgblack@eecs.umich.edu return new Unknown(machInst); 1087154Sgblack@eecs.umich.edu } 1097154Sgblack@eecs.umich.edu ''' 1107154Sgblack@eecs.umich.edu}}; 1117154Sgblack@eecs.umich.edu 1127154Sgblack@eecs.umich.edudef format Thumb16UncondBranch() {{ 1137154Sgblack@eecs.umich.edu decode_block = ''' 1147154Sgblack@eecs.umich.edu return new B(machInst, sext<12>(bits(machInst, 10, 0) << 1), COND_UC); 1157154Sgblack@eecs.umich.edu ''' 1167154Sgblack@eecs.umich.edu}}; 1177154Sgblack@eecs.umich.edu 1187155Sgblack@eecs.umich.edudef format Thumb32BranchesAndMiscCtrl() {{ 1197154Sgblack@eecs.umich.edu decode_block = ''' 1207155Sgblack@eecs.umich.edu { 1217155Sgblack@eecs.umich.edu const uint32_t op = bits(machInst, 26, 20); 1227155Sgblack@eecs.umich.edu const uint32_t op1 = bits(machInst, 14, 12); 1237155Sgblack@eecs.umich.edu switch (op1 & 0x5) { 1247155Sgblack@eecs.umich.edu case 0x0: 1257155Sgblack@eecs.umich.edu if (op == 127) { 1267155Sgblack@eecs.umich.edu if (op1 & 0x2) { 1277281Sgblack@eecs.umich.edu // Permanently undefined. 1287281Sgblack@eecs.umich.edu return new Unknown(machInst); 1297155Sgblack@eecs.umich.edu } else { 13010037SARM gem5 Developers return new Smc(machInst); 1317155Sgblack@eecs.umich.edu } 1327155Sgblack@eecs.umich.edu } else if ((op & 0x38) != 0x38) { 1337155Sgblack@eecs.umich.edu const uint32_t s = bits(machInst, 26); 1347155Sgblack@eecs.umich.edu const uint32_t j1 = bits(machInst, 13); 1357155Sgblack@eecs.umich.edu const uint32_t j2 = bits(machInst, 11); 1367155Sgblack@eecs.umich.edu const uint32_t imm6 = bits(machInst, 21, 16); 1377155Sgblack@eecs.umich.edu const uint32_t imm11 = bits(machInst, 10, 0); 1387155Sgblack@eecs.umich.edu const int32_t imm = sext<21>((s << 20) | 1397155Sgblack@eecs.umich.edu (j2 << 19) | (j1 << 18) | 1407155Sgblack@eecs.umich.edu (imm6 << 12) | (imm11 << 1)); 1417155Sgblack@eecs.umich.edu return new B(machInst, imm, 1427155Sgblack@eecs.umich.edu (ConditionCode)(uint32_t)bits(machInst, 25, 22)); 1437155Sgblack@eecs.umich.edu } else { 14410037SARM gem5 Developers // HIGH: 12-11=10, LOW: 15-14=00, 12=0 1457155Sgblack@eecs.umich.edu switch (op) { 1467155Sgblack@eecs.umich.edu case 0x38: 1477155Sgblack@eecs.umich.edu case 0x39: 1487204Sgblack@eecs.umich.edu { 1497204Sgblack@eecs.umich.edu const IntRegIndex rn = 1507204Sgblack@eecs.umich.edu (IntRegIndex)(uint32_t)bits(machInst, 19, 16); 1517204Sgblack@eecs.umich.edu const uint8_t byteMask = bits(machInst, 11, 8); 15210037SARM gem5 Developers const bool r = bits(machInst, 20); 15310037SARM gem5 Developers if (bits(machInst, 5)) { 15410037SARM gem5 Developers const uint8_t sysM = (bits(machInst, 4) << 4) | 15510037SARM gem5 Developers byteMask; 15610037SARM gem5 Developers return new MsrBankedReg(machInst, rn, sysM, r); 15710037SARM gem5 Developers } else { 15810037SARM gem5 Developers if (r) { 15910037SARM gem5 Developers return new MsrSpsrReg(machInst, rn, byteMask); 16010037SARM gem5 Developers } else { 16110037SARM gem5 Developers return new MsrCpsrReg(machInst, rn, byteMask); 16210037SARM gem5 Developers } 16310037SARM gem5 Developers } 1647204Sgblack@eecs.umich.edu } 1657155Sgblack@eecs.umich.edu case 0x3a: 1667155Sgblack@eecs.umich.edu { 1677155Sgblack@eecs.umich.edu const uint32_t op1 = bits(machInst, 10, 8); 1687155Sgblack@eecs.umich.edu const uint32_t op2 = bits(machInst, 7, 0); 1697155Sgblack@eecs.umich.edu if (op1 != 0) { 1707316Sgblack@eecs.umich.edu const bool enable = bits(machInst, 10, 9) == 0x2; 1717316Sgblack@eecs.umich.edu const uint32_t mods = bits(machInst, 8, 0) | 1727316Sgblack@eecs.umich.edu ((enable ? 1 : 0) << 9); 1737316Sgblack@eecs.umich.edu return new Cps(machInst, mods); 1747155Sgblack@eecs.umich.edu } else if ((op2 & 0xf0) == 0xf0) { 1757613SGene.Wu@arm.com return new Dbg(machInst); 1767155Sgblack@eecs.umich.edu } else { 1777155Sgblack@eecs.umich.edu switch (op2) { 1787155Sgblack@eecs.umich.edu case 0x0: 1797248Sgblack@eecs.umich.edu return new NopInst(machInst); 1807155Sgblack@eecs.umich.edu case 0x1: 1817419Sgblack@eecs.umich.edu return new YieldInst(machInst); 1827155Sgblack@eecs.umich.edu case 0x2: 1837419Sgblack@eecs.umich.edu return new WfeInst(machInst); 1847155Sgblack@eecs.umich.edu case 0x3: 1857419Sgblack@eecs.umich.edu return new WfiInst(machInst); 1867155Sgblack@eecs.umich.edu case 0x4: 1877419Sgblack@eecs.umich.edu return new SevInst(machInst); 1887155Sgblack@eecs.umich.edu default: 1897155Sgblack@eecs.umich.edu break; 1907155Sgblack@eecs.umich.edu } 1917155Sgblack@eecs.umich.edu } 1927155Sgblack@eecs.umich.edu break; 1937155Sgblack@eecs.umich.edu } 1947155Sgblack@eecs.umich.edu case 0x3b: 1957155Sgblack@eecs.umich.edu { 1967155Sgblack@eecs.umich.edu const uint32_t op = bits(machInst, 7, 4); 1977155Sgblack@eecs.umich.edu switch (op) { 1987155Sgblack@eecs.umich.edu case 0x0: 1997284Sgblack@eecs.umich.edu return new Leavex(machInst); 2007155Sgblack@eecs.umich.edu case 0x1: 2017284Sgblack@eecs.umich.edu return new Enterx(machInst); 2027155Sgblack@eecs.umich.edu case 0x2: 2037603SGene.Wu@arm.com return new Clrex(machInst); 2047155Sgblack@eecs.umich.edu case 0x4: 20510037SARM gem5 Developers return new Dsb(machInst, 0); 2067155Sgblack@eecs.umich.edu case 0x5: 20710037SARM gem5 Developers return new Dmb(machInst, 0); 2087155Sgblack@eecs.umich.edu case 0x6: 20910037SARM gem5 Developers return new Isb(machInst, 0); 2107155Sgblack@eecs.umich.edu default: 2117155Sgblack@eecs.umich.edu break; 2127155Sgblack@eecs.umich.edu } 2137155Sgblack@eecs.umich.edu break; 2147155Sgblack@eecs.umich.edu } 2157155Sgblack@eecs.umich.edu case 0x3c: 2167344SAli.Saidi@ARM.com { 21710037SARM gem5 Developers return new BxjReg(machInst, 2187344SAli.Saidi@ARM.com (IntRegIndex)(uint32_t)bits(machInst, 19, 16), 2197344SAli.Saidi@ARM.com COND_UC); 2207344SAli.Saidi@ARM.com } 2217155Sgblack@eecs.umich.edu case 0x3d: 2227188Sgblack@eecs.umich.edu { 2237188Sgblack@eecs.umich.edu const uint32_t imm32 = bits(machInst, 7, 0); 22410037SARM gem5 Developers if (imm32 == 0) { 22510037SARM gem5 Developers return new Eret(machInst); 22610037SARM gem5 Developers } else { 22710037SARM gem5 Developers return new SubsImmPclr(machInst, INTREG_PC, 22810037SARM gem5 Developers INTREG_LR, imm32, false); 22910037SARM gem5 Developers } 2307188Sgblack@eecs.umich.edu } 2317155Sgblack@eecs.umich.edu case 0x3e: 23210037SARM gem5 Developers case 0x3f: 2337204Sgblack@eecs.umich.edu { 23410037SARM gem5 Developers 2357204Sgblack@eecs.umich.edu const IntRegIndex rd = 2367204Sgblack@eecs.umich.edu (IntRegIndex)(uint32_t)bits(machInst, 11, 8); 23710037SARM gem5 Developers const bool r = bits(machInst, 20); 23810037SARM gem5 Developers if (bits(machInst, 5)) { 23910037SARM gem5 Developers const uint8_t sysM = (bits(machInst, 4) << 4) | 24010037SARM gem5 Developers bits(machInst, 11, 8); 24110037SARM gem5 Developers return new MrsBankedReg(machInst, rd, sysM, r); 24210037SARM gem5 Developers } else { 24310037SARM gem5 Developers if (r) { 24410037SARM gem5 Developers return new MrsSpsr(machInst, rd); 24510037SARM gem5 Developers } else { 24610037SARM gem5 Developers return new MrsCpsr(machInst, rd); 24710037SARM gem5 Developers } 24810037SARM gem5 Developers } 2497204Sgblack@eecs.umich.edu } 25010037SARM gem5 Developers case 0xfe: 2517204Sgblack@eecs.umich.edu { 25210037SARM gem5 Developers uint32_t imm16 = (bits(machInst, 19, 16) << 12) | 25310037SARM gem5 Developers (bits(machInst, 11, 0) << 0); 25410037SARM gem5 Developers return new Hvc(machInst, imm16); 2557204Sgblack@eecs.umich.edu } 2567155Sgblack@eecs.umich.edu } 2577155Sgblack@eecs.umich.edu break; 2587155Sgblack@eecs.umich.edu } 2597155Sgblack@eecs.umich.edu case 0x1: 2607155Sgblack@eecs.umich.edu { 2617155Sgblack@eecs.umich.edu const uint32_t s = bits(machInst, 26); 2627155Sgblack@eecs.umich.edu const uint32_t i1 = !(bits(machInst, 13) ^ s); 2637155Sgblack@eecs.umich.edu const uint32_t i2 = !(bits(machInst, 11) ^ s); 2647155Sgblack@eecs.umich.edu const uint32_t imm10 = bits(machInst, 25, 16); 2657155Sgblack@eecs.umich.edu const uint32_t imm11 = bits(machInst, 10, 0); 2667155Sgblack@eecs.umich.edu const int32_t imm = sext<25>((s << 24) | 2677155Sgblack@eecs.umich.edu (i1 << 23) | (i2 << 22) | 2687155Sgblack@eecs.umich.edu (imm10 << 12) | (imm11 << 1)); 2698909SAli.Saidi@ARM.com return new B(machInst, imm, COND_UC); 2707155Sgblack@eecs.umich.edu } 2717155Sgblack@eecs.umich.edu case 0x4: 2727155Sgblack@eecs.umich.edu { 2737290Sgblack@eecs.umich.edu if (bits(machInst, 0) == 1) { 2747290Sgblack@eecs.umich.edu return new Unknown(machInst); 2757290Sgblack@eecs.umich.edu } 2767155Sgblack@eecs.umich.edu const uint32_t s = bits(machInst, 26); 2777155Sgblack@eecs.umich.edu const uint32_t i1 = !(bits(machInst, 13) ^ s); 2787155Sgblack@eecs.umich.edu const uint32_t i2 = !(bits(machInst, 11) ^ s); 2797155Sgblack@eecs.umich.edu const uint32_t imm10h = bits(machInst, 25, 16); 2807155Sgblack@eecs.umich.edu const uint32_t imm10l = bits(machInst, 10, 1); 2817155Sgblack@eecs.umich.edu const int32_t imm = sext<25>((s << 24) | 2827155Sgblack@eecs.umich.edu (i1 << 23) | (i2 << 22) | 2837155Sgblack@eecs.umich.edu (imm10h << 12) | (imm10l << 2)); 2848909SAli.Saidi@ARM.com return new BlxImm(machInst, imm, COND_UC); 2857155Sgblack@eecs.umich.edu } 2867155Sgblack@eecs.umich.edu case 0x5: 2877155Sgblack@eecs.umich.edu { 2887155Sgblack@eecs.umich.edu const uint32_t s = bits(machInst, 26); 2897155Sgblack@eecs.umich.edu const uint32_t i1 = !(bits(machInst, 13) ^ s); 2907155Sgblack@eecs.umich.edu const uint32_t i2 = !(bits(machInst, 11) ^ s); 2917155Sgblack@eecs.umich.edu const uint32_t imm10 = bits(machInst, 25, 16); 2927155Sgblack@eecs.umich.edu const uint32_t imm11 = bits(machInst, 10, 0); 2937155Sgblack@eecs.umich.edu const int32_t imm = sext<25>((s << 24) | 2947155Sgblack@eecs.umich.edu (i1 << 23) | (i2 << 22) | 2957155Sgblack@eecs.umich.edu (imm10 << 12) | (imm11 << 1)); 2968909SAli.Saidi@ARM.com return new Bl(machInst, imm, COND_UC); 2977155Sgblack@eecs.umich.edu } 2987155Sgblack@eecs.umich.edu default: 2997155Sgblack@eecs.umich.edu break; 3007155Sgblack@eecs.umich.edu } 3017155Sgblack@eecs.umich.edu return new Unknown(machInst); 3027155Sgblack@eecs.umich.edu } 3037154Sgblack@eecs.umich.edu ''' 3047154Sgblack@eecs.umich.edu}}; 305