1 /* libs/pixelflinger/codeflinger/ARMAssemblerInterface.cpp 2 ** 3 ** Copyright 2006, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 19 #include <errno.h> 20 #include <stdlib.h> 21 #include <stdint.h> 22 #include <sys/types.h> 23 24 #include <cutils/log.h> 25 #include "codeflinger/ARMAssemblerInterface.h" 26 27 namespace android { 28 29 // ---------------------------------------------------------------------------- 30 31 ARMAssemblerInterface::~ARMAssemblerInterface() 32 { 33 } 34 35 int ARMAssemblerInterface::buildImmediate( 36 uint32_t immediate, uint32_t& rot, uint32_t& imm) 37 { 38 rot = 0; 39 imm = immediate; 40 if (imm > 0x7F) { // skip the easy cases 41 while (!(imm&3) || (imm&0xFC000000)) { 42 uint32_t newval; 43 newval = imm >> 2; 44 newval |= (imm&3) << 30; 45 imm = newval; 46 rot += 2; 47 if (rot == 32) { 48 rot = 0; 49 break; 50 } 51 } 52 } 53 rot = (16 - (rot>>1)) & 0xF; 54 55 if (imm>=0x100) 56 return -EINVAL; 57 58 if (((imm>>(rot<<1)) | (imm<<(32-(rot<<1)))) != immediate) 59 return -1; 60 61 return 0; 62 } 63 64 // shifters... 65 66 bool ARMAssemblerInterface::isValidImmediate(uint32_t immediate) 67 { 68 uint32_t rot, imm; 69 return buildImmediate(immediate, rot, imm) == 0; 70 } 71 72 uint32_t ARMAssemblerInterface::imm(uint32_t immediate) 73 { 74 uint32_t rot, imm; 75 int err = buildImmediate(immediate, rot, imm); 76 77 LOG_ALWAYS_FATAL_IF(err==-EINVAL, 78 "immediate %08x cannot be encoded", 79 immediate); 80 81 LOG_ALWAYS_FATAL_IF(err, 82 "immediate (%08x) encoding bogus!", 83 immediate); 84 85 return (1<<25) | (rot<<8) | imm; 86 } 87 88 uint32_t ARMAssemblerInterface::reg_imm(int Rm, int type, uint32_t shift) 89 { 90 return ((shift&0x1F)<<7) | ((type&0x3)<<5) | (Rm&0xF); 91 } 92 93 uint32_t ARMAssemblerInterface::reg_rrx(int Rm) 94 { 95 return (ROR<<5) | (Rm&0xF); 96 } 97 98 uint32_t ARMAssemblerInterface::reg_reg(int Rm, int type, int Rs) 99 { 100 return ((Rs&0xF)<<8) | ((type&0x3)<<5) | (1<<4) | (Rm&0xF); 101 } 102 103 // addressing modes... 104 // LDR(B)/STR(B)/PLD (immediate and Rm can be negative, which indicate U=0) 105 uint32_t ARMAssemblerInterface::immed12_pre(int32_t immed12, int W) 106 { 107 LOG_ALWAYS_FATAL_IF(abs(immed12) >= 0x800, 108 "LDR(B)/STR(B)/PLD immediate too big (%08x)", 109 immed12); 110 return (1<<24) | (((uint32_t(immed12)>>31)^1)<<23) | 111 ((W&1)<<21) | (abs(immed12)&0x7FF); 112 } 113 114 uint32_t ARMAssemblerInterface::immed12_post(int32_t immed12) 115 { 116 LOG_ALWAYS_FATAL_IF(abs(immed12) >= 0x800, 117 "LDR(B)/STR(B)/PLD immediate too big (%08x)", 118 immed12); 119 120 return (((uint32_t(immed12)>>31)^1)<<23) | (abs(immed12)&0x7FF); 121 } 122 123 uint32_t ARMAssemblerInterface::reg_scale_pre(int Rm, int type, 124 uint32_t shift, int W) 125 { 126 return (1<<25) | (1<<24) | 127 (((uint32_t(Rm)>>31)^1)<<23) | ((W&1)<<21) | 128 reg_imm(abs(Rm), type, shift); 129 } 130 131 uint32_t ARMAssemblerInterface::reg_scale_post(int Rm, int type, uint32_t shift) 132 { 133 return (1<<25) | (((uint32_t(Rm)>>31)^1)<<23) | reg_imm(abs(Rm), type, shift); 134 } 135 136 // LDRH/LDRSB/LDRSH/STRH (immediate and Rm can be negative, which indicate U=0) 137 uint32_t ARMAssemblerInterface::immed8_pre(int32_t immed8, int W) 138 { 139 uint32_t offset = abs(immed8); 140 141 LOG_ALWAYS_FATAL_IF(abs(immed8) >= 0x100, 142 "LDRH/LDRSB/LDRSH/STRH immediate too big (%08x)", 143 immed8); 144 145 return (1<<24) | (1<<22) | (((uint32_t(immed8)>>31)^1)<<23) | 146 ((W&1)<<21) | (((offset&0xF0)<<4)|(offset&0xF)); 147 } 148 149 uint32_t ARMAssemblerInterface::immed8_post(int32_t immed8) 150 { 151 uint32_t offset = abs(immed8); 152 153 LOG_ALWAYS_FATAL_IF(abs(immed8) >= 0x100, 154 "LDRH/LDRSB/LDRSH/STRH immediate too big (%08x)", 155 immed8); 156 157 return (1<<22) | (((uint32_t(immed8)>>31)^1)<<23) | 158 (((offset&0xF0)<<4) | (offset&0xF)); 159 } 160 161 uint32_t ARMAssemblerInterface::reg_pre(int Rm, int W) 162 { 163 return (1<<24) | (((uint32_t(Rm)>>31)^1)<<23) | ((W&1)<<21) | (abs(Rm)&0xF); 164 } 165 166 uint32_t ARMAssemblerInterface::reg_post(int Rm) 167 { 168 return (((uint32_t(Rm)>>31)^1)<<23) | (abs(Rm)&0xF); 169 } 170 171 172 }; // namespace android 173 174
