1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /* 18 * This file contains codegen for the Thumb ISA and is intended to be 19 * includes by: 20 * 21 * Codegen-$(TARGET_ARCH_VARIANT).c 22 * 23 */ 24 25 /* 26 * Reserve 6 bytes at the beginning of the trace 27 * +----------------------------+ 28 * | prof count addr (4 bytes) | 29 * +----------------------------+ 30 * | chain cell offset (2 bytes)| 31 * +----------------------------+ 32 * 33 * ...and then code to increment the execution 34 * 35 * For continuous profiling (12 bytes): 36 * 37 * mov r0, pc @ move adr of "mov r0,pc" + 4 to r0 38 * sub r0, #10 @ back up to addr prof count pointer 39 * ldr r0, [r0] @ get address of counter 40 * ldr r1, [r0] 41 * add r1, #1 42 * str r1, [r0] 43 * 44 * For periodic profiling (4 bytes): 45 * call TEMPLATE_PERIODIC_PROFILING 46 * 47 * and return the size (in bytes) of the generated code. 48 */ 49 50 static int genTraceProfileEntry(CompilationUnit *cUnit) 51 { 52 intptr_t addr = (intptr_t)dvmJitNextTraceCounter(); 53 assert(__BYTE_ORDER == __LITTLE_ENDIAN); 54 newLIR1(cUnit, kArm16BitData, addr & 0xffff); 55 newLIR1(cUnit, kArm16BitData, (addr >> 16) & 0xffff); 56 cUnit->chainCellOffsetLIR = 57 (LIR *) newLIR1(cUnit, kArm16BitData, CHAIN_CELL_OFFSET_TAG); 58 cUnit->headerSize = 6; 59 if ((gDvmJit.profileMode == kTraceProfilingContinuous) || 60 (gDvmJit.profileMode == kTraceProfilingDisabled)) { 61 /* Thumb instruction used directly here to ensure correct size */ 62 newLIR2(cUnit, kThumbMovRR_H2L, r0, r15pc); 63 newLIR2(cUnit, kThumbSubRI8, r0, 10); 64 newLIR3(cUnit, kThumbLdrRRI5, r0, r0, 0); 65 newLIR3(cUnit, kThumbLdrRRI5, r1, r0, 0); 66 newLIR2(cUnit, kThumbAddRI8, r1, 1); 67 newLIR3(cUnit, kThumbStrRRI5, r1, r0, 0); 68 return 12; 69 } else { 70 int opcode = TEMPLATE_PERIODIC_PROFILING; 71 newLIR2(cUnit, kThumbBlx1, 72 (int) gDvmJit.codeCache + templateEntryOffsets[opcode], 73 (int) gDvmJit.codeCache + templateEntryOffsets[opcode]); 74 newLIR2(cUnit, kThumbBlx2, 75 (int) gDvmJit.codeCache + templateEntryOffsets[opcode], 76 (int) gDvmJit.codeCache + templateEntryOffsets[opcode]); 77 return 4; 78 } 79 } 80 81 /* 82 * Perform a "reg cmp imm" operation and jump to the PCR region if condition 83 * satisfies. 84 */ 85 static void genNegFloat(CompilationUnit *cUnit, RegLocation rlDest, 86 RegLocation rlSrc) 87 { 88 RegLocation rlResult; 89 rlSrc = loadValue(cUnit, rlSrc, kCoreReg); 90 rlResult = dvmCompilerEvalLoc(cUnit, rlDest, kCoreReg, true); 91 opRegRegImm(cUnit, kOpAdd, rlResult.lowReg, 92 rlSrc.lowReg, 0x80000000); 93 storeValue(cUnit, rlDest, rlResult); 94 } 95 96 static void genNegDouble(CompilationUnit *cUnit, RegLocation rlDest, 97 RegLocation rlSrc) 98 { 99 RegLocation rlResult; 100 rlSrc = loadValueWide(cUnit, rlSrc, kCoreReg); 101 rlResult = dvmCompilerEvalLoc(cUnit, rlDest, kCoreReg, true); 102 opRegRegImm(cUnit, kOpAdd, rlResult.highReg, rlSrc.highReg, 103 0x80000000); 104 genRegCopy(cUnit, rlResult.lowReg, rlSrc.lowReg); 105 storeValueWide(cUnit, rlDest, rlResult); 106 } 107 108 static void genMulLong(CompilationUnit *cUnit, RegLocation rlDest, 109 RegLocation rlSrc1, RegLocation rlSrc2) 110 { 111 RegLocation rlResult; 112 loadValueDirectWideFixed(cUnit, rlSrc1, r0, r1); 113 loadValueDirectWideFixed(cUnit, rlSrc2, r2, r3); 114 genDispatchToHandler(cUnit, TEMPLATE_MUL_LONG); 115 rlResult = dvmCompilerGetReturnWide(cUnit); 116 storeValueWide(cUnit, rlDest, rlResult); 117 } 118 119 static bool partialOverlap(int sreg1, int sreg2) 120 { 121 return abs(sreg1 - sreg2) == 1; 122 } 123 124 static void genLong3Addr(CompilationUnit *cUnit, MIR *mir, OpKind firstOp, 125 OpKind secondOp, RegLocation rlDest, 126 RegLocation rlSrc1, RegLocation rlSrc2) 127 { 128 RegLocation rlResult; 129 if (partialOverlap(rlSrc1.sRegLow,rlSrc2.sRegLow) || 130 partialOverlap(rlSrc1.sRegLow,rlDest.sRegLow) || 131 partialOverlap(rlSrc2.sRegLow,rlDest.sRegLow)) { 132 // Rare case - not enough registers to properly handle 133 genInterpSingleStep(cUnit, mir); 134 } else if (rlDest.sRegLow == rlSrc1.sRegLow) { 135 // Already 2-operand 136 rlResult = loadValueWide(cUnit, rlDest, kCoreReg); 137 rlSrc2 = loadValueWide(cUnit, rlSrc2, kCoreReg); 138 opRegReg(cUnit, firstOp, rlResult.lowReg, rlSrc2.lowReg); 139 opRegReg(cUnit, secondOp, rlResult.highReg, rlSrc2.highReg); 140 storeValueWide(cUnit, rlDest, rlResult); 141 } else if (rlDest.sRegLow == rlSrc2.sRegLow) { 142 // Bad case - must use/clobber Src1 and reassign Dest 143 rlSrc1 = loadValueWide(cUnit, rlSrc1, kCoreReg); 144 rlResult = loadValueWide(cUnit, rlDest, kCoreReg); 145 opRegReg(cUnit, firstOp, rlSrc1.lowReg, rlResult.lowReg); 146 opRegReg(cUnit, secondOp, rlSrc1.highReg, rlResult.highReg); 147 // Old reg assignments are now invalid 148 dvmCompilerClobber(cUnit, rlResult.lowReg); 149 dvmCompilerClobber(cUnit, rlResult.highReg); 150 dvmCompilerClobber(cUnit, rlSrc1.lowReg); 151 dvmCompilerClobber(cUnit, rlSrc1.highReg); 152 rlDest.location = kLocDalvikFrame; 153 assert(rlSrc1.location == kLocPhysReg); 154 // Reassign registers - rlDest will now get rlSrc1's old regs 155 storeValueWide(cUnit, rlDest, rlSrc1); 156 } else { 157 // Copy Src1 to Dest 158 rlSrc2 = loadValueWide(cUnit, rlSrc2, kCoreReg); 159 rlResult = dvmCompilerEvalLoc(cUnit, rlDest, kCoreReg, false); 160 loadValueDirectWide(cUnit, rlSrc1, rlResult.lowReg, 161 rlResult.highReg); 162 rlResult.location = kLocPhysReg; 163 opRegReg(cUnit, firstOp, rlResult.lowReg, rlSrc2.lowReg); 164 opRegReg(cUnit, secondOp, rlResult.highReg, rlSrc2.highReg); 165 storeValueWide(cUnit, rlDest, rlResult); 166 } 167 } 168 169 void dvmCompilerInitializeRegAlloc(CompilationUnit *cUnit) 170 { 171 int numTemps = sizeof(coreTemps)/sizeof(int); 172 RegisterPool *pool = (RegisterPool *) dvmCompilerNew(sizeof(*pool), true); 173 cUnit->regPool = pool; 174 pool->numCoreTemps = numTemps; 175 pool->coreTemps = (RegisterInfo *) 176 dvmCompilerNew(numTemps * sizeof(*pool->coreTemps), true); 177 pool->numFPTemps = 0; 178 pool->FPTemps = NULL; 179 dvmCompilerInitPool(pool->coreTemps, coreTemps, pool->numCoreTemps); 180 dvmCompilerInitPool(pool->FPTemps, NULL, 0); 181 pool->nullCheckedRegs = 182 dvmCompilerAllocBitVector(cUnit->numSSARegs, false); 183 } 184 185 /* Export the Dalvik PC assicated with an instruction to the StackSave area */ 186 static ArmLIR *genExportPC(CompilationUnit *cUnit, MIR *mir) 187 { 188 ArmLIR *res; 189 int rDPC = dvmCompilerAllocTemp(cUnit); 190 int rAddr = dvmCompilerAllocTemp(cUnit); 191 int offset = offsetof(StackSaveArea, xtra.currentPc); 192 res = loadConstant(cUnit, rDPC, (int) (cUnit->method->insns + mir->offset)); 193 newLIR2(cUnit, kThumbMovRR, rAddr, r5FP); 194 newLIR2(cUnit, kThumbSubRI8, rAddr, sizeof(StackSaveArea) - offset); 195 storeWordDisp( cUnit, rAddr, 0, rDPC); 196 return res; 197 } 198 199 static void genMonitor(CompilationUnit *cUnit, MIR *mir) 200 { 201 genMonitorPortable(cUnit, mir); 202 } 203 204 static void genCmpLong(CompilationUnit *cUnit, MIR *mir, RegLocation rlDest, 205 RegLocation rlSrc1, RegLocation rlSrc2) 206 { 207 RegLocation rlResult; 208 loadValueDirectWideFixed(cUnit, rlSrc1, r0, r1); 209 loadValueDirectWideFixed(cUnit, rlSrc2, r2, r3); 210 genDispatchToHandler(cUnit, TEMPLATE_CMP_LONG); 211 rlResult = dvmCompilerGetReturn(cUnit); 212 storeValue(cUnit, rlDest, rlResult); 213 } 214 215 static bool genInlinedAbsFloat(CompilationUnit *cUnit, MIR *mir) 216 { 217 int offset = offsetof(Thread, interpSave.retval); 218 RegLocation rlSrc = dvmCompilerGetSrc(cUnit, mir, 0); 219 int reg0 = loadValue(cUnit, rlSrc, kCoreReg).lowReg; 220 int signMask = dvmCompilerAllocTemp(cUnit); 221 loadConstant(cUnit, signMask, 0x7fffffff); 222 newLIR2(cUnit, kThumbAndRR, reg0, signMask); 223 dvmCompilerFreeTemp(cUnit, signMask); 224 storeWordDisp(cUnit, r6SELF, offset, reg0); 225 //TUNING: rewrite this to not clobber 226 dvmCompilerClobber(cUnit, reg0); 227 return false; 228 } 229 230 static bool genInlinedAbsDouble(CompilationUnit *cUnit, MIR *mir) 231 { 232 int offset = offsetof(Thread, interpSave.retval); 233 RegLocation rlSrc = dvmCompilerGetSrcWide(cUnit, mir, 0, 1); 234 RegLocation regSrc = loadValueWide(cUnit, rlSrc, kCoreReg); 235 int reglo = regSrc.lowReg; 236 int reghi = regSrc.highReg; 237 int signMask = dvmCompilerAllocTemp(cUnit); 238 loadConstant(cUnit, signMask, 0x7fffffff); 239 storeWordDisp(cUnit, r6SELF, offset, reglo); 240 newLIR2(cUnit, kThumbAndRR, reghi, signMask); 241 dvmCompilerFreeTemp(cUnit, signMask); 242 storeWordDisp(cUnit, r6SELF, offset + 4, reghi); 243 //TUNING: rewrite this to not clobber 244 dvmCompilerClobber(cUnit, reghi); 245 return false; 246 } 247 248 /* No select in thumb, so we need to branch. Thumb2 will do better */ 249 static bool genInlinedMinMaxInt(CompilationUnit *cUnit, MIR *mir, bool isMin) 250 { 251 int offset = offsetof(Thread, interpSave.retval); 252 RegLocation rlSrc1 = dvmCompilerGetSrc(cUnit, mir, 0); 253 RegLocation rlSrc2 = dvmCompilerGetSrc(cUnit, mir, 1); 254 int reg0 = loadValue(cUnit, rlSrc1, kCoreReg).lowReg; 255 int reg1 = loadValue(cUnit, rlSrc2, kCoreReg).lowReg; 256 newLIR2(cUnit, kThumbCmpRR, reg0, reg1); 257 ArmLIR *branch1 = newLIR2(cUnit, kThumbBCond, 2, 258 isMin ? kArmCondLt : kArmCondGt); 259 newLIR2(cUnit, kThumbMovRR, reg0, reg1); 260 ArmLIR *target = newLIR0(cUnit, kArmPseudoTargetLabel); 261 target->defMask = ENCODE_ALL; 262 newLIR3(cUnit, kThumbStrRRI5, reg0, r6SELF, offset >> 2); 263 branch1->generic.target = (LIR *)target; 264 //TUNING: rewrite this to not clobber 265 dvmCompilerClobber(cUnit,reg0); 266 return false; 267 } 268 269 static void genMultiplyByTwoBitMultiplier(CompilationUnit *cUnit, 270 RegLocation rlSrc, RegLocation rlResult, int lit, 271 int firstBit, int secondBit) 272 { 273 // We can't implement "add src, src, src, lsl#shift" on Thumb, so we have 274 // to do a regular multiply. 275 opRegRegImm(cUnit, kOpMul, rlResult.lowReg, rlSrc.lowReg, lit); 276 } 277 278 static void genMultiplyByShiftAndReverseSubtract(CompilationUnit *cUnit, 279 RegLocation rlSrc, RegLocation rlResult, int lit) 280 { 281 int tReg = dvmCompilerAllocTemp(cUnit); 282 opRegRegImm(cUnit, kOpLsl, tReg, rlSrc.lowReg, lit); 283 opRegRegReg(cUnit, kOpSub, rlResult.lowReg, tReg, rlSrc.lowReg); 284 } 285
