cerion | cee3031 | 2004-12-17 20:30:21 +0000 | [diff] [blame] | 1 | |
| 2 | /*---------------------------------------------------------------*/ |
| 3 | /*--- ---*/ |
| 4 | /*--- This file (host-x86/isel.c) is ---*/ |
| 5 | /*--- Copyright (c) 2004 OpenWorks LLP. All rights reserved. ---*/ |
| 6 | /*--- ---*/ |
| 7 | /*---------------------------------------------------------------*/ |
| 8 | |
| 9 | /* |
| 10 | This file is part of LibVEX, a library for dynamic binary |
| 11 | instrumentation and translation. |
| 12 | |
| 13 | Copyright (C) 2004 OpenWorks, LLP. |
| 14 | |
| 15 | This program is free software; you can redistribute it and/or modify |
| 16 | it under the terms of the GNU General Public License as published by |
| 17 | the Free Software Foundation; Version 2 dated June 1991 of the |
| 18 | license. |
| 19 | |
| 20 | This program is distributed in the hope that it will be useful, |
| 21 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or liability |
| 23 | for damages. See the GNU General Public License for more details. |
| 24 | |
| 25 | Neither the names of the U.S. Department of Energy nor the |
| 26 | University of California nor the names of its contributors may be |
| 27 | used to endorse or promote products derived from this software |
| 28 | without prior written permission. |
| 29 | |
| 30 | You should have received a copy of the GNU General Public License |
| 31 | along with this program; if not, write to the Free Software |
| 32 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 33 | USA. |
| 34 | */ |
| 35 | |
| 36 | #include "libvex_basictypes.h" |
| 37 | #include "libvex_ir.h" |
| 38 | #include "libvex.h" |
| 39 | |
| 40 | #include "main/vex_util.h" |
| 41 | #include "main/vex_globals.h" |
| 42 | #include "host-generic/h_generic_regs.h" |
| 43 | #include "host-arm/hdefs.h" |
| 44 | |
| 45 | |
cerion | cee3031 | 2004-12-17 20:30:21 +0000 | [diff] [blame] | 46 | /*---------------------------------------------------------*/ |
| 47 | /*--- ISelEnv ---*/ |
| 48 | /*---------------------------------------------------------*/ |
| 49 | |
| 50 | /* This carries around: |
| 51 | |
| 52 | - A mapping from IRTemp to IRType, giving the type of any IRTemp we |
| 53 | might encounter. This is computed before insn selection starts, |
| 54 | and does not change. |
| 55 | |
| 56 | - A mapping from IRTemp to HReg. This tells the insn selector |
| 57 | which virtual register(s) are associated with each IRTemp |
| 58 | temporary. This is computed before insn selection starts, and |
| 59 | does not change. We expect this mapping to map precisely the |
| 60 | same set of IRTemps as the type mapping does. |
| 61 | |
| 62 | - vregmap holds the primary register for the IRTemp. |
| 63 | |
| 64 | - The code array, that is, the insns selected so far. |
| 65 | |
| 66 | - A counter, for generating new virtual registers. |
| 67 | |
| 68 | Note, this is all host-independent. */ |
| 69 | |
| 70 | typedef |
| 71 | struct { |
| 72 | IRTypeEnv* type_env; |
| 73 | |
| 74 | HReg* vregmap; |
| 75 | Int n_vregmap; |
| 76 | |
| 77 | HInstrArray* code; |
| 78 | |
| 79 | Int vreg_ctr; |
| 80 | } |
| 81 | ISelEnv; |
| 82 | |
| 83 | static HReg lookupIRTemp ( ISelEnv* env, IRTemp tmp ) |
| 84 | { |
| 85 | vassert(tmp >= 0); |
| 86 | vassert(tmp < env->n_vregmap); |
| 87 | return env->vregmap[tmp]; |
| 88 | } |
| 89 | |
| 90 | static void addInstr ( ISelEnv* env, ARMInstr* instr ) |
| 91 | { |
| 92 | addHInstr(env->code, instr); |
| 93 | if (vex_traceflags & VEX_TRACE_VCODE) { |
| 94 | ppARMInstr(instr); |
| 95 | vex_printf("\n"); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | static HReg newVRegI ( ISelEnv* env ) |
| 100 | { |
| 101 | HReg reg = mkHReg(env->vreg_ctr, HRcInt32, True/*virtual reg*/); |
| 102 | env->vreg_ctr++; |
| 103 | return reg; |
| 104 | } |
| 105 | |
| 106 | |
| 107 | |
| 108 | /*---------------------------------------------------------*/ |
| 109 | /*--- ISEL: Forward declarations ---*/ |
| 110 | /*---------------------------------------------------------*/ |
| 111 | |
| 112 | /* These are organised as iselXXX and iselXXX_wrk pairs. The |
| 113 | iselXXX_wrk do the real work, but are not to be called directly. |
| 114 | For each XXX, iselXXX calls its iselXXX_wrk counterpart, then |
| 115 | checks that all returned registers are virtual. You should not |
| 116 | call the _wrk version directly. |
| 117 | */ |
| 118 | static ARMAMode1* iselIntExpr_AMode1_wrk ( ISelEnv* env, IRExpr* e ); |
| 119 | static ARMAMode1* iselIntExpr_AMode1 ( ISelEnv* env, IRExpr* e ); |
| 120 | |
| 121 | static ARMAMode2* iselIntExpr_AMode2_wrk ( ISelEnv* env, IRExpr* e ); |
| 122 | static ARMAMode2* iselIntExpr_AMode2 ( ISelEnv* env, IRExpr* e ); |
| 123 | |
| 124 | static ARMAMode3* iselIntExpr_AMode3_wrk ( ISelEnv* env, IRExpr* e ); |
| 125 | static ARMAMode3* iselIntExpr_AMode3 ( ISelEnv* env, IRExpr* e ); |
| 126 | |
| 127 | static ARMBranchDest* iselIntExpr_BD_wrk ( ISelEnv* env, IRExpr* e ); |
| 128 | static ARMBranchDest* iselIntExpr_BD ( ISelEnv* env, IRExpr* e ); |
| 129 | |
| 130 | static ARMCondCode iselCondCode_wrk ( ISelEnv* env, IRExpr* e ); |
| 131 | static ARMCondCode iselCondCode ( ISelEnv* env, IRExpr* e ); |
| 132 | |
| 133 | static HReg iselIntExpr_R_wrk ( ISelEnv* env, IRExpr* e ); |
| 134 | static HReg iselIntExpr_R ( ISelEnv* env, IRExpr* e ); |
| 135 | |
| 136 | #if 0 |
| 137 | static void iselInt64Expr_wrk ( HReg* rHi, HReg* rLo, |
| 138 | ISelEnv* env, IRExpr* e ); |
| 139 | static void iselInt64Expr ( HReg* rHi, HReg* rLo, |
| 140 | ISelEnv* env, IRExpr* e ); |
| 141 | #endif |
| 142 | |
| 143 | |
| 144 | /*---------------------------------------------------------*/ |
| 145 | /*--- ISEL: Misc helpers ---*/ |
| 146 | /*---------------------------------------------------------*/ |
| 147 | #if 0 |
| 148 | /* Is this a 32-bit zero expression? */ |
| 149 | static Bool isZero32 ( IRExpr* e ) |
| 150 | { |
| 151 | return e->tag == Iex_Const |
| 152 | && e->Iex.Const.con->tag == Ico_U32 |
| 153 | && e->Iex.Const.con->Ico.U32 == 0; |
| 154 | } |
| 155 | #endif |
| 156 | |
| 157 | /* Make a int reg-reg move. */ |
| 158 | static ARMInstr* mk_iMOVsd_RR ( HReg src, HReg dst ) |
| 159 | { |
| 160 | vassert(hregClass(src) == HRcInt32); |
| 161 | vassert(hregClass(dst) == HRcInt32); |
| 162 | return ARMInstr_DPInstr1(ARMalu_MOV, dst, ARMAMode1_ShlI(src, 0)); |
| 163 | } |
| 164 | |
| 165 | #if 0 |
| 166 | /* Advance/retreat stack pointer by n. */ |
| 167 | |
| 168 | static void add_to_sp ( ISelEnv* env, Int n ) |
| 169 | { |
| 170 | HReg tmp; |
| 171 | ARMImm12A imm12a; |
| 172 | vassert(n > 0 && n < 256 && (n%4) == 0); |
| 173 | |
| 174 | if ( mk_ARMImm12A( (UInt)n, &imm12a ) ) { |
| 175 | addInstr(env, ARMInstr_DPInstr2(ARMalu_ADD, |
| 176 | GET_SP_REG(), GET_SP_REG(), |
| 177 | ARMAMode1_I12A( imm12a ))); |
| 178 | } else { |
| 179 | tmp = newVRegI(env); |
| 180 | addInstr(env, ARMInstr_Literal( tmp, (UInt)n )); |
| 181 | addInstr(env, ARMInstr_DPInstr2(ARMalu_ADD, |
| 182 | GET_SP_REG(), GET_SP_REG(), |
| 183 | ARMAMode1_ShlI( tmp, 0 ))); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | static void sub_from_sp ( ISelEnv* env, Int n ) |
| 188 | { |
| 189 | HReg tmp; |
| 190 | ARMImm12A imm12a; |
| 191 | vassert(n > 0 && n < 256 && (n%4) == 0); |
| 192 | |
| 193 | if ( mk_ARMImm12A( (UInt)n, &imm12a ) ) { |
| 194 | addInstr(env, ARMInstr_DPInstr2(ARMalu_SUB, |
| 195 | GET_SP_REG(), GET_SP_REG(), |
| 196 | ARMAMode1_I12A( imm12a ))); |
| 197 | } else { |
| 198 | tmp = newVRegI(env); |
| 199 | addInstr(env, ARMInstr_Literal( tmp, (UInt)n )); |
| 200 | addInstr(env, ARMInstr_DPInstr2(ARMalu_SUB, |
| 201 | GET_SP_REG(), GET_SP_REG(), |
| 202 | ARMAMode1_ShlI( tmp, 0 ))); |
| 203 | } |
| 204 | } |
| 205 | #endif |
| 206 | |
| 207 | #if 0 |
| 208 | /* Push an arg onto the host stack, in preparation for a call to a |
| 209 | helper function of some kind. Returns the number of 32-bit words |
| 210 | pushed. */ |
| 211 | |
| 212 | static Int pushArg ( ISelEnv* env, IRExpr* arg ) |
| 213 | { |
| 214 | IRType arg_ty = typeOfIRExpr(env->type_env, arg); |
| 215 | if (arg_ty == Ity_I32) { |
| 216 | |
| 217 | // CAB: This right? |
| 218 | addInstr(env, ARMInstr_StoreW( GET_SP_REG(), iselIntExpr_AMode2(env, arg) ) ); |
| 219 | return 1; |
| 220 | } |
| 221 | |
| 222 | #if 0 |
| 223 | else |
| 224 | if (arg_ty == Ity_I64) { |
| 225 | HReg rHi, rLo; |
| 226 | iselInt64Expr(&rHi, &rLo, env, arg); |
| 227 | addInstr(env, X86Instr_Push(X86RMI_Reg(rHi))); |
| 228 | addInstr(env, X86Instr_Push(X86RMI_Reg(rLo))); |
| 229 | return 2; |
| 230 | } |
| 231 | #endif |
| 232 | ppIRExpr(arg); |
| 233 | vpanic("pushArg(arm): can't handle arg of this type"); |
| 234 | } |
| 235 | #endif |
| 236 | |
| 237 | #if 0 |
| 238 | /* Complete the call to a helper function, by calling the |
| 239 | helper and clearing the args off the stack. */ |
| 240 | |
| 241 | static |
| 242 | void callHelperAndClearArgs ( ISelEnv* env, ARMCondCode cc, |
| 243 | IRCallee* cee, Int n_arg_ws ) |
| 244 | { |
| 245 | /* Complication. Need to decide which reg to use as the fn address |
| 246 | pointer, in a way that doesn't trash regparm-passed |
| 247 | parameters. */ |
| 248 | vassert(sizeof(void*) == 4); |
| 249 | |
| 250 | // CAB: cee->regparms ? |
| 251 | |
| 252 | // addInstr(env, X86Instr_Call( cc, (UInt)cee->addr, cee->regparms)); |
| 253 | ARMBranchDest* dst = ARMBranchDest_Imm( (UInt)cee->addr ); |
| 254 | addInstr(env, ARMInstr_BranchL(cc, dst)); |
| 255 | |
| 256 | if (n_arg_ws > 0) |
| 257 | add_to_sp(env, 4*n_arg_ws); |
| 258 | } |
| 259 | #endif |
| 260 | |
| 261 | #if 0 |
| 262 | /* Used only in doHelperCall. See big comment in doHelperCall re |
| 263 | handling of regparm args. This function figures out whether |
| 264 | evaluation of an expression might require use of a fixed register. |
| 265 | If in doubt return True (safe but suboptimal). |
| 266 | */ |
| 267 | static |
| 268 | Bool mightRequireFixedRegs ( IRExpr* e ) |
| 269 | { |
| 270 | switch (e->tag) { |
| 271 | case Iex_Tmp: case Iex_Const: case Iex_Get: |
| 272 | return False; |
| 273 | default: |
| 274 | return True; |
| 275 | } |
| 276 | } |
| 277 | #endif |
| 278 | |
| 279 | /* Do a complete function call. guard is a Ity_Bit expression |
| 280 | indicating whether or not the call happens. If guard==NULL, the |
| 281 | call is unconditional. */ |
| 282 | |
| 283 | static |
| 284 | void doHelperCall ( ISelEnv* env, |
| 285 | Bool passBBP, |
| 286 | IRExpr* guard, IRCallee* cee, IRExpr** args ) |
| 287 | { |
| 288 | #if 0 |
| 289 | ARMCondCode cc; |
| 290 | HReg argregs[3]; |
| 291 | HReg tmpregs[3]; |
| 292 | Bool danger; |
| 293 | Int not_done_yet, n_args, n_arg_ws, stack_limit, |
| 294 | i, argreg, argregX; |
| 295 | |
| 296 | /* Marshal args for a call, do the call, and clear the stack. |
| 297 | Complexities to consider: |
| 298 | |
| 299 | * if passBBP is True, %ebp (the baseblock pointer) is to be |
| 300 | passed as the first arg. |
| 301 | |
| 302 | * If the callee claims regparmness of 1, 2 or 3, we must pass the |
| 303 | first 1, 2 or 3 args in registers (EAX, EDX, and ECX |
| 304 | respectively). To keep things relatively simple, only args of |
| 305 | type I32 may be passed as regparms -- just bomb out if anything |
| 306 | else turns up. Clearly this depends on the front ends not |
| 307 | trying to pass any other types as regparms. |
| 308 | */ |
| 309 | |
| 310 | /* 16 Nov 2004: the regparm handling is complicated by the |
| 311 | following problem. |
| 312 | |
| 313 | Consider a call two a function with two regparm parameters: |
| 314 | f(e1,e2). We need to compute e1 into %eax and e2 into %edx. |
| 315 | Suppose code is first generated to compute e1 into %eax. Then, |
| 316 | code is generated to compute e2 into %edx. Unfortunately, if |
| 317 | the latter code sequence uses %eax, it will trash the value of |
| 318 | e1 computed by the former sequence. This could happen if (for |
| 319 | example) e2 itself involved a function call. In the code below, |
| 320 | args are evaluated right-to-left, not left-to-right, but the |
| 321 | principle and the problem are the same. |
| 322 | |
| 323 | One solution is to compute all regparm-bound args into vregs |
| 324 | first, and once they are all done, move them to the relevant |
| 325 | real regs. This always gives correct code, but it also gives |
| 326 | a bunch of vreg-to-rreg moves which are usually redundant but |
| 327 | are hard for the register allocator to get rid of. |
| 328 | |
| 329 | A compromise is to first examine all regparm'd argument |
| 330 | expressions. If they are all so simple that it is clear |
| 331 | they will be evaluated without use of any fixed registers, |
| 332 | use the old compute-directly-to-fixed-target scheme. If not, |
| 333 | be safe and use the via-vregs scheme. |
| 334 | |
| 335 | Note this requires being able to examine an expression and |
| 336 | determine whether or not evaluation of it might use a fixed |
| 337 | register. That requires knowledge of how the rest of this |
| 338 | insn selector works. Currently just the following 3 are |
| 339 | regarded as safe -- hopefully they cover the majority of |
| 340 | arguments in practice: IRExpr_Tmp IRExpr_Const IRExpr_Get. |
| 341 | */ |
| 342 | vassert(cee->regparms >= 0 && cee->regparms <= 3); |
| 343 | |
| 344 | n_args = n_arg_ws = 0; |
| 345 | while (args[n_args]) n_args++; |
| 346 | |
| 347 | not_done_yet = n_args; |
| 348 | if (passBBP) |
| 349 | not_done_yet++; |
| 350 | |
| 351 | stack_limit = cee->regparms; |
| 352 | if (cee->regparms > 0 && passBBP) stack_limit--; |
| 353 | |
| 354 | /* ------ BEGIN marshall all arguments ------ */ |
| 355 | |
| 356 | /* Push (R to L) the stack-passed args, [n_args-1 .. stack_limit] */ |
| 357 | for (i = n_args-1; i >= stack_limit; i--) { |
| 358 | n_arg_ws += pushArg(env, args[i]); |
| 359 | not_done_yet--; |
| 360 | } |
| 361 | |
| 362 | /* args [stack_limit-1 .. 0] and possibly %ebp are to be passed in |
| 363 | registers. */ |
| 364 | |
| 365 | if (cee->regparms > 0) { |
| 366 | |
| 367 | /* ------ BEGIN deal with regparms ------ */ |
| 368 | |
| 369 | /* deal with regparms, not forgetting %ebp if needed. */ |
| 370 | argregs[0] = hregX86_EAX(); |
| 371 | argregs[1] = hregX86_EDX(); |
| 372 | argregs[2] = hregX86_ECX(); |
| 373 | tmpregs[0] = tmpregs[1] = tmpregs[2] = INVALID_HREG; |
| 374 | |
| 375 | argreg = cee->regparms; |
| 376 | |
| 377 | /* In keeping with big comment above, detect potential danger |
| 378 | and use the via-vregs scheme if needed. */ |
| 379 | danger = False; |
| 380 | for (i = stack_limit-1; i >= 0; i--) { |
| 381 | if (mightRequireFixedRegs(args[i])) { |
| 382 | danger = True; |
| 383 | break; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | if (danger) { |
| 388 | |
| 389 | /* Move via temporaries */ |
| 390 | argregX = argreg; |
| 391 | for (i = stack_limit-1; i >= 0; i--) { |
| 392 | |
| 393 | if (0) { |
| 394 | vex_printf("x86 host: register param is complex: "); |
| 395 | ppIRExpr(args[i]); |
| 396 | vex_printf("\n"); |
| 397 | } |
| 398 | |
| 399 | argreg--; |
| 400 | vassert(argreg >= 0); |
| 401 | vassert(typeOfIRExpr(env->type_env, args[i]) == Ity_I32); |
| 402 | tmpregs[argreg] = iselIntExpr_R(env, args[i]); |
| 403 | not_done_yet--; |
| 404 | } |
| 405 | for (i = stack_limit-1; i >= 0; i--) { |
| 406 | argregX--; |
| 407 | vassert(argregX >= 0); |
| 408 | addInstr( env, mk_iMOVsd_RR( tmpregs[argregX], argregs[argregX] ) ); |
| 409 | } |
| 410 | |
| 411 | } else { |
| 412 | /* It's safe to compute all regparm args directly into their |
| 413 | target registers. */ |
| 414 | for (i = stack_limit-1; i >= 0; i--) { |
| 415 | argreg--; |
| 416 | vassert(argreg >= 0); |
| 417 | vassert(typeOfIRExpr(env->type_env, args[i]) == Ity_I32); |
| 418 | addInstr(env, X86Instr_Alu32R(Xalu_MOV, |
| 419 | iselIntExpr_RMI(env, args[i]), |
| 420 | argregs[argreg])); |
| 421 | not_done_yet--; |
| 422 | } |
| 423 | |
| 424 | } |
| 425 | |
| 426 | /* Not forgetting %ebp if needed. */ |
| 427 | if (passBBP) { |
| 428 | vassert(argreg == 1); |
| 429 | addInstr(env, mk_iMOVsd_RR( hregX86_EBP(), argregs[0])); |
| 430 | not_done_yet--; |
| 431 | } |
| 432 | |
| 433 | /* ------ END deal with regparms ------ */ |
| 434 | |
| 435 | } else { |
| 436 | |
| 437 | /* No regparms. Heave %ebp on the stack if needed. */ |
| 438 | if (passBBP) { |
| 439 | addInstr(env, X86Instr_Push(X86RMI_Reg(hregX86_EBP()))); |
| 440 | n_arg_ws++; |
| 441 | not_done_yet--; |
| 442 | } |
| 443 | |
| 444 | } |
| 445 | |
| 446 | vassert(not_done_yet == 0); |
| 447 | |
| 448 | /* ------ END marshall all arguments ------ */ |
| 449 | |
| 450 | /* Now we can compute the condition. We can't do it earlier |
| 451 | because the argument computations could trash the condition |
| 452 | codes. Be a bit clever to handle the common case where the |
| 453 | guard is 1:Bit. */ |
| 454 | cc = Xcc_ALWAYS; |
| 455 | if (guard) { |
| 456 | if (guard->tag == Iex_Const |
| 457 | && guard->Iex.Const.con->tag == Ico_U1 |
| 458 | && guard->Iex.Const.con->Ico.U1 == True) { |
| 459 | /* unconditional -- do nothing */ |
| 460 | } else { |
| 461 | cc = iselCondCode( env, guard ); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | /* call the helper, and get the args off the stack afterwards. */ |
| 466 | callHelperAndClearArgs( env, cc, cee, n_arg_ws ); |
| 467 | #endif |
| 468 | } |
| 469 | |
| 470 | |
| 471 | |
| 472 | // CAB: Do we need to deal with elemSz != 8 ? |
| 473 | |
| 474 | /* Given a guest-state array descriptor, an index expression and a |
| 475 | bias, generate an ARMAMode holding the relevant guest state |
| 476 | offset. */ |
| 477 | |
| 478 | static |
| 479 | ARMAMode2* genGuestArrayOffset ( ISelEnv* env, IRArray* descr, |
| 480 | IRExpr* off, Int bias ) |
| 481 | { |
| 482 | HReg tmp, tmp2, roff; |
| 483 | Int elemSz = sizeofIRType(descr->elemTy); |
| 484 | Int nElems = descr->nElems; |
| 485 | ARMImm12A imm12a; |
| 486 | |
| 487 | /* throw out any cases not generated by an x86 front end. In |
| 488 | theory there might be a day where we need to handle them -- if |
| 489 | we ever run non-x86-guest on x86 host. */ |
| 490 | |
| 491 | if (nElems != 8 || (elemSz != 1 && elemSz != 8)) |
| 492 | vpanic("genGuestArrayOffset(arm host)"); |
| 493 | |
| 494 | /* Compute off into a reg, %off. Then return: |
| 495 | |
| 496 | movl %off, %tmp |
| 497 | addl $bias, %tmp (if bias != 0) |
| 498 | andl %tmp, 7 |
| 499 | ... base(%ebp, %tmp, shift) ... |
| 500 | */ |
| 501 | tmp = newVRegI(env); |
| 502 | roff = iselIntExpr_R(env, off); |
| 503 | addInstr(env, mk_iMOVsd_RR(roff, tmp)); |
| 504 | if (bias != 0) { |
| 505 | if ( mk_ARMImm12A( (UInt)bias, &imm12a ) ) { |
| 506 | addInstr(env, ARMInstr_DPInstr2(ARMalu_ADD, tmp, tmp, |
| 507 | ARMAMode1_I12A( imm12a ))); |
| 508 | } else { |
| 509 | HReg tmp3 = newVRegI(env); |
| 510 | addInstr(env, ARMInstr_Literal( tmp, (UInt)bias )); |
| 511 | addInstr(env, ARMInstr_DPInstr2(ARMalu_ADD, tmp, tmp, |
| 512 | ARMAMode1_ShlI( tmp3, 0 ))); |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | mk_ARMImm12A( (UInt)7, &imm12a ); |
| 517 | addInstr(env, ARMInstr_DPInstr2(ARMalu_AND, tmp, tmp, |
| 518 | ARMAMode1_I12A( imm12a ))); |
| 519 | vassert(elemSz == 1 || elemSz == 8); |
| 520 | |
| 521 | |
| 522 | |
| 523 | // CAB: This anywhere near correct? |
| 524 | |
| 525 | // X86AMode_IRRS: Immediate + Reg1 + (Reg2 << Shift) |
| 526 | // return X86AMode_IRRS( descr->base, hregX86_EBP(), tmp, elemSz==8 ? 3 : 0); |
| 527 | |
| 528 | tmp2 = newVRegI(env); // tmp2 = GET_BP_REG + (tmp << 3|0) |
| 529 | addInstr(env, ARMInstr_DPInstr2(ARMalu_ADD, tmp2, GET_BP_REG(), |
| 530 | ARMAMode1_ShlI(tmp, elemSz==8 ? 3 : 0))); |
| 531 | return ARMAMode2_RI( tmp2, descr->base ); |
| 532 | } |
| 533 | |
| 534 | |
| 535 | /*---------------------------------------------------------*/ |
| 536 | /*--- ISEL ... ---*/ |
| 537 | /*---------------------------------------------------------*/ |
| 538 | |
| 539 | /* --------------------- AMODEs --------------------- */ |
| 540 | |
| 541 | /* Return an AMode which computes the value of the specified |
| 542 | expression, possibly also adding insns to the code list as a |
| 543 | result. |
| 544 | */ |
| 545 | |
| 546 | /* ---------------- Addressing Mode 1 ---------------- */ |
| 547 | |
| 548 | static Bool sane_AMode1 ( ARMAMode1* am ) |
| 549 | { |
| 550 | switch (am->tag) { |
| 551 | default: |
| 552 | vpanic("sane_AMode1: unknown arm amode tag"); |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | static ARMAMode1* iselIntExpr_AMode1 ( ISelEnv* env, IRExpr* e ) |
| 557 | { |
| 558 | ARMAMode1* am = iselIntExpr_AMode1_wrk(env, e); |
| 559 | vassert(sane_AMode1(am)); |
| 560 | return am; |
| 561 | } |
| 562 | |
| 563 | /* DO NOT CALL THIS DIRECTLY ! */ |
| 564 | static ARMAMode1* iselIntExpr_AMode1_wrk ( ISelEnv* env, IRExpr* e ) |
| 565 | { |
| 566 | IRType ty = typeOfIRExpr(env->type_env,e); |
| 567 | vassert(ty == Ity_I32); |
| 568 | |
| 569 | // ARMam1_I12A, /* Imm12A: extended (rotated) immedate */ |
| 570 | // ARMam1_ShlI, /* ShlI reg Imm5 */ |
| 571 | // ARMam1_ShrI, /* ShrI reg Imm5 */ |
| 572 | // ARMam1_SarI, /* SarI reg Imm5 */ |
| 573 | // ARMam1_ShlR, /* ShlR reg reg */ |
| 574 | // ARMam1_ShrR, /* ShrR reg reg */ |
| 575 | // ARMam1_SarR, /* SarR reg reg */ |
| 576 | |
| 577 | // ALU ops: |
| 578 | /* |
| 579 | ARMalu_And, ARMalu_Orr, ARMalu_Eor, ARMalu_Bic, // Logic |
| 580 | ARMalu_Sub, ARMalu_Rsb, ARMalu_Add, ARMalu_Adc, ARMalu_Sbc, ARMalu_Rsc, // Arith |
| 581 | ARMalu_Tst, ARMalu_Teq, ARMalu_Cmp, ARMalu_Cmn, // test |
| 582 | ARMalu_Mov, ARMalu_Mvn // Move |
| 583 | */ |
| 584 | |
| 585 | |
| 586 | return NULL; |
| 587 | } |
| 588 | |
| 589 | |
| 590 | |
| 591 | /* ---------------- Addressing Mode 2 ---------------- */ |
| 592 | |
| 593 | static Bool sane_AMode2 ( ARMAMode2* am ) |
| 594 | { |
| 595 | switch (am->tag) { |
| 596 | default: |
| 597 | vpanic("sane_AMode2: unknown arm amode tag"); |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | static ARMAMode2* iselIntExpr_AMode2_wrk ( ISelEnv* env, IRExpr* e ) |
| 602 | { |
| 603 | ARMAMode2* am = iselIntExpr_AMode2_wrk(env, e); |
| 604 | vassert(sane_AMode2(am)); |
| 605 | return am; |
| 606 | } |
| 607 | |
| 608 | /* DO NOT CALL THIS DIRECTLY ! */ |
| 609 | static ARMAMode2* iselIntExpr_AMode2 ( ISelEnv* env, IRExpr* e ) |
| 610 | { |
| 611 | IRType ty = typeOfIRExpr(env->type_env,e); |
| 612 | vassert(ty == Ity_I32); |
| 613 | |
| 614 | // ARMam2_RI, /* Reg +/- Imm12 */ |
| 615 | // ARMam2_RR, /* Reg +/- Reg */ |
| 616 | // ARMam2_RRS, /* Reg +/- (Reg << Imm5) */ |
| 617 | |
| 618 | return NULL; |
| 619 | } |
| 620 | |
| 621 | |
| 622 | |
| 623 | /* ---------------- Addressing Mode 3 ---------------- */ |
| 624 | |
| 625 | static Bool sane_AMode3 ( ARMAMode3* am ) |
| 626 | { |
| 627 | switch (am->tag) { |
| 628 | default: |
| 629 | vpanic("sane_AMode3: unknown arm amode tag"); |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | static ARMAMode3* iselIntExpr_AMode3 ( ISelEnv* env, IRExpr* e ) |
| 634 | { |
| 635 | ARMAMode3* am = iselIntExpr_AMode3_wrk(env, e); |
| 636 | vassert(sane_AMode3(am)); |
| 637 | return am; |
| 638 | } |
| 639 | |
| 640 | /* DO NOT CALL THIS DIRECTLY ! */ |
| 641 | static ARMAMode3* iselIntExpr_AMode3_wrk ( ISelEnv* env, IRExpr* e ) |
| 642 | { |
| 643 | IRType ty = typeOfIRExpr(env->type_env,e); |
| 644 | vassert(ty == Ity_I32); |
| 645 | |
| 646 | // ARMam3_RI, /* Reg +/- Imm8 */ |
| 647 | // ARMam3_RR, /* Reg +/- Reg */ |
| 648 | |
| 649 | return NULL; |
| 650 | } |
| 651 | |
| 652 | |
| 653 | |
| 654 | /* ---------------- Branch Destination ---------------- */ |
| 655 | |
| 656 | static ARMBranchDest* iselIntExpr_BD ( ISelEnv* env, IRExpr* e ) |
| 657 | { |
| 658 | ARMBranchDest* bd = iselIntExpr_BD_wrk(env, e); |
| 659 | /* sanity checks ... */ |
| 660 | switch (bd->tag) { |
| 661 | case ARMbdImm: |
| 662 | return bd; |
| 663 | case ARMbdReg: |
| 664 | vassert(hregClass(bd->ARMbd.Reg.reg) == HRcInt32); |
| 665 | // vassert(hregIsVirtual(bd->ARMbd.Reg.reg)); // CAB ? |
| 666 | return bd; |
| 667 | default: |
| 668 | vpanic("iselIntExpr_BD: unknown arm BD tag"); |
| 669 | } |
| 670 | } |
| 671 | |
| 672 | /* DO NOT CALL THIS DIRECTLY ! */ |
| 673 | static ARMBranchDest* iselIntExpr_BD_wrk ( ISelEnv* env, IRExpr* e ) |
| 674 | { |
| 675 | /* |
| 676 | ARMbdImm, |
| 677 | ARMbdReg |
| 678 | */ |
| 679 | |
| 680 | return NULL; |
| 681 | } |
| 682 | |
| 683 | |
| 684 | |
| 685 | |
| 686 | |
| 687 | /* --------------------- CONDCODE --------------------- */ |
| 688 | |
| 689 | /* Generate code to evaluated a bit-typed expression, returning the |
| 690 | condition code which would correspond when the expression would |
| 691 | notionally have returned 1. */ |
| 692 | |
| 693 | static ARMCondCode iselCondCode ( ISelEnv* env, IRExpr* e ) |
| 694 | { |
| 695 | /* Uh, there's nothing we can sanity check here, unfortunately. */ |
| 696 | return iselCondCode_wrk(env, e); |
| 697 | } |
| 698 | |
| 699 | /* DO NOT CALL THIS DIRECTLY ! */ |
| 700 | static ARMCondCode iselCondCode_wrk ( ISelEnv* env, IRExpr* e ) |
| 701 | { |
| 702 | #if 0 |
| 703 | MatchInfo mi; |
| 704 | DECLARE_PATTERN(p_32to1); |
| 705 | DECLARE_PATTERN(p_1Uto32_then_32to1); |
| 706 | #endif |
| 707 | |
| 708 | return 0; |
| 709 | } |
| 710 | |
| 711 | |
| 712 | |
| 713 | static HReg iselIntExpr_R ( ISelEnv* env, IRExpr* e ) |
| 714 | { |
| 715 | return iselIntExpr_R_wrk(env, e); |
| 716 | } |
| 717 | |
| 718 | /* DO NOT CALL THIS DIRECTLY ! */ |
| 719 | static HReg iselIntExpr_R_wrk ( ISelEnv* env, IRExpr* e ) |
| 720 | { |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | |
| 725 | |
| 726 | /*---------------------------------------------------------*/ |
| 727 | /*--- ISEL: Statements ---*/ |
| 728 | /*---------------------------------------------------------*/ |
| 729 | |
| 730 | static void iselStmt ( ISelEnv* env, IRStmt* stmt ) |
| 731 | { |
| 732 | if (vex_traceflags & VEX_TRACE_VCODE) { |
| 733 | vex_printf("\n-- "); |
| 734 | ppIRStmt(stmt); |
| 735 | vex_printf("\n"); |
| 736 | } |
| 737 | switch (stmt->tag) { |
| 738 | |
| 739 | /* --------- STORE --------- */ |
| 740 | /* little-endian write to memory */ |
| 741 | case Ist_STle: { |
sewardj | 8fa4208 | 2004-12-31 17:22:04 +0000 | [diff] [blame] | 742 | HReg reg; |
cerion | cee3031 | 2004-12-17 20:30:21 +0000 | [diff] [blame] | 743 | IRType tya = typeOfIRExpr(env->type_env, stmt->Ist.STle.addr); |
| 744 | IRType tyd = typeOfIRExpr(env->type_env, stmt->Ist.STle.data); |
| 745 | vassert(tya == Ity_I32); |
sewardj | 8fa4208 | 2004-12-31 17:22:04 +0000 | [diff] [blame] | 746 | reg = iselIntExpr_R(env, stmt->Ist.STle.data); |
cerion | cee3031 | 2004-12-17 20:30:21 +0000 | [diff] [blame] | 747 | |
| 748 | if (tyd == Ity_I8) { |
| 749 | ARMAMode2* am2 = iselIntExpr_AMode2(env, stmt->Ist.STle.addr); |
| 750 | addInstr(env, ARMInstr_StoreB(reg,am2)); |
| 751 | return; |
| 752 | } |
| 753 | if (tyd == Ity_I16) { |
| 754 | ARMAMode3* am3 = iselIntExpr_AMode3(env, stmt->Ist.STle.addr); |
| 755 | addInstr(env, ARMInstr_StoreH(reg,am3)); |
| 756 | return; |
| 757 | } |
| 758 | if (tyd == Ity_I32) { |
| 759 | ARMAMode2* am2 = iselIntExpr_AMode2(env, stmt->Ist.STle.addr); |
| 760 | addInstr(env, ARMInstr_StoreW(reg,am2)); |
| 761 | return; |
| 762 | } |
| 763 | } |
| 764 | |
| 765 | /* --------- PUT --------- */ |
| 766 | /* write guest state, fixed offset */ |
| 767 | case Ist_Put: { |
| 768 | IRType tyd = typeOfIRExpr(env->type_env, stmt->Ist.Put.data); |
| 769 | HReg reg = iselIntExpr_R(env, stmt->Ist.Put.data); |
| 770 | |
| 771 | // CAB: This anywhere near right?! |
| 772 | if (tyd == Ity_I32) { |
| 773 | ARMAMode2* am2 = ARMAMode2_RI(GET_BP_REG(), stmt->Ist.Put.offset); |
| 774 | addInstr(env, ARMInstr_StoreW(reg, am2)); |
| 775 | return; |
| 776 | } |
| 777 | if (tyd == Ity_I16) { |
| 778 | ARMAMode3* am3 = ARMAMode3_RI(GET_BP_REG(), stmt->Ist.Put.offset); |
| 779 | addInstr(env, ARMInstr_StoreH(reg, am3)); |
| 780 | return; |
| 781 | } |
| 782 | if (tyd == Ity_I8) { |
| 783 | ARMAMode2* am2 = ARMAMode2_RI(GET_BP_REG(), stmt->Ist.Put.offset); |
| 784 | addInstr(env, ARMInstr_StoreB(reg, am2)); |
| 785 | return; |
| 786 | } |
| 787 | // CAB: Ity_I32, Ity_I16 ? |
| 788 | break; |
| 789 | } |
| 790 | |
| 791 | /* --------- Indexed PUT --------- */ |
| 792 | /* write guest state, run-time offset */ |
| 793 | case Ist_PutI: { |
| 794 | ARMAMode2* am2 |
| 795 | = genGuestArrayOffset( |
| 796 | env, stmt->Ist.PutI.descr, |
| 797 | stmt->Ist.PutI.ix, stmt->Ist.PutI.bias ); |
| 798 | |
| 799 | IRType tyd = typeOfIRExpr(env->type_env, stmt->Ist.PutI.data); |
| 800 | |
| 801 | if (tyd == Ity_I8) { |
| 802 | HReg reg = iselIntExpr_R(env, stmt->Ist.PutI.data); |
| 803 | addInstr(env, ARMInstr_StoreB(reg, am2)); |
| 804 | return; |
| 805 | } |
| 806 | // CAB: Ity_I32, Ity_I16 ? |
| 807 | break; |
| 808 | } |
| 809 | |
| 810 | /* --------- TMP --------- */ |
| 811 | /* assign value to temporary */ |
| 812 | case Ist_Tmp: { |
| 813 | IRTemp tmp = stmt->Ist.Tmp.tmp; |
| 814 | IRType ty = typeOfIRTemp(env->type_env, tmp); |
| 815 | |
| 816 | if (ty == Ity_I32 || ty == Ity_I16 || ty == Ity_I8) { |
| 817 | ARMAMode1* am = iselIntExpr_AMode1(env, stmt->Ist.Tmp.data); |
| 818 | HReg dst = lookupIRTemp(env, tmp); |
| 819 | addInstr(env, ARMInstr_DPInstr1(ARMalu_MOV,dst,am)); |
| 820 | return; |
| 821 | } |
| 822 | |
| 823 | // CAB: Ity_I1 ? |
| 824 | |
| 825 | break; |
| 826 | } |
| 827 | |
| 828 | /* --------- Call to DIRTY helper --------- */ |
| 829 | /* call complex ("dirty") helper function */ |
| 830 | case Ist_Dirty: { |
sewardj | a8415ff | 2005-01-21 20:55:36 +0000 | [diff] [blame] | 831 | //IRType retty; |
cerion | cee3031 | 2004-12-17 20:30:21 +0000 | [diff] [blame] | 832 | IRDirty* d = stmt->Ist.Dirty.details; |
| 833 | Bool passBBP = False; |
| 834 | |
| 835 | if (d->nFxState == 0) |
| 836 | vassert(!d->needsBBP); |
sewardj | 428fabd | 2005-03-21 03:11:17 +0000 | [diff] [blame] | 837 | |
| 838 | passBBP = toBool(d->nFxState > 0 && d->needsBBP); |
cerion | cee3031 | 2004-12-17 20:30:21 +0000 | [diff] [blame] | 839 | |
| 840 | /* Marshal args, do the call, clear stack. */ |
| 841 | doHelperCall( env, passBBP, d->guard, d->cee, d->args ); |
| 842 | |
| 843 | /* Now figure out what to do with the returned value, if any. */ |
| 844 | if (d->tmp == IRTemp_INVALID) |
| 845 | /* No return value. Nothing to do. */ |
| 846 | return; |
| 847 | |
sewardj | a8415ff | 2005-01-21 20:55:36 +0000 | [diff] [blame] | 848 | //retty = typeOfIRTemp(env->type_env, d->tmp); |
cerion | cee3031 | 2004-12-17 20:30:21 +0000 | [diff] [blame] | 849 | |
| 850 | // CAB: ? if (retty == Ity_I64) { |
| 851 | |
| 852 | #if 0 |
| 853 | if (retty == Ity_I32 || retty == Ity_I16 || retty == Ity_I8) { |
| 854 | /* The returned value is in %eax. Park it in the register |
| 855 | associated with tmp. */ |
| 856 | HReg dst = lookupIRTemp(env, d->tmp); |
| 857 | addInstr(env, mk_iMOVsd_RR(hregX86_EAX(),dst) ); |
| 858 | return; |
| 859 | } |
| 860 | #endif |
| 861 | break; |
| 862 | } |
| 863 | |
| 864 | /* --------- EXIT --------- */ |
| 865 | /* conditional exit from BB */ |
| 866 | case Ist_Exit: { |
| 867 | ARMBranchDest* dst; |
| 868 | ARMCondCode cc; |
| 869 | if (stmt->Ist.Exit.dst->tag != Ico_U32) |
| 870 | vpanic("isel_arm: Ist_Exit: dst is not a 32-bit value"); |
| 871 | |
| 872 | // CAB: Where does jumpkind fit in ? |
| 873 | // stmt->Ist.Exit.jk |
| 874 | |
| 875 | dst = iselIntExpr_BD(env, IRExpr_Const(stmt->Ist.Exit.dst)); |
| 876 | cc = iselCondCode(env,stmt->Ist.Exit.guard); |
| 877 | addInstr(env, ARMInstr_Branch(cc, dst)); |
| 878 | return; |
| 879 | } |
| 880 | |
| 881 | default: break; |
| 882 | } |
| 883 | ppIRStmt(stmt); |
| 884 | vpanic("iselStmt"); |
| 885 | } |
| 886 | |
| 887 | |
| 888 | /*---------------------------------------------------------*/ |
| 889 | /*--- ISEL: Basic block terminators (Nexts) ---*/ |
| 890 | /*---------------------------------------------------------*/ |
| 891 | |
| 892 | static void iselNext ( ISelEnv* env, IRExpr* next, IRJumpKind jk ) |
| 893 | { |
| 894 | ARMBranchDest* bd; |
| 895 | if (vex_traceflags & VEX_TRACE_VCODE) { |
| 896 | vex_printf("\n-- goto {"); |
| 897 | ppIRJumpKind(jk); |
| 898 | vex_printf("} "); |
| 899 | ppIRExpr(next); |
| 900 | vex_printf("\n"); |
| 901 | } |
| 902 | bd = iselIntExpr_BD(env, next); |
| 903 | |
| 904 | // CAB: jk ? |
| 905 | |
| 906 | addInstr( env, ARMInstr_Branch(ARMccAL, bd) ); |
| 907 | } |
| 908 | |
| 909 | |
| 910 | /*---------------------------------------------------------*/ |
| 911 | /*--- Insn selector top-level ---*/ |
| 912 | /*---------------------------------------------------------*/ |
| 913 | |
| 914 | /* Translate an entire BB to arm code. */ |
| 915 | |
| 916 | HInstrArray* iselBB_ARM ( IRBB* bb ) |
| 917 | { |
| 918 | Int i, j; |
| 919 | |
| 920 | /* Make up an initial environment to use. */ |
| 921 | ISelEnv* env = LibVEX_Alloc(sizeof(ISelEnv)); |
| 922 | env->vreg_ctr = 0; |
| 923 | |
| 924 | /* Set up output code array. */ |
| 925 | env->code = newHInstrArray(); |
| 926 | |
| 927 | /* Copy BB's type env. */ |
| 928 | env->type_env = bb->tyenv; |
| 929 | |
| 930 | /* Make up an IRTemp -> virtual HReg mapping. This doesn't |
| 931 | change as we go along. */ |
| 932 | env->n_vregmap = bb->tyenv->types_used; |
| 933 | env->vregmap = LibVEX_Alloc(env->n_vregmap * sizeof(HReg)); |
| 934 | |
| 935 | /* For each IR temporary, allocate a 32bit virtual register. */ |
| 936 | j = 0; |
| 937 | for (i = 0; i < env->n_vregmap; i++) { |
| 938 | env->vregmap[i] = mkHReg(j++, HRcInt32, True); |
| 939 | } |
| 940 | env->vreg_ctr = j; |
| 941 | |
| 942 | /* Ok, finally we can iterate over the statements. */ |
| 943 | for (i = 0; i < bb->stmts_used; i++) |
| 944 | if (bb->stmts[i]) |
| 945 | iselStmt(env,bb->stmts[i]); |
| 946 | |
| 947 | iselNext(env,bb->next,bb->jumpkind); |
| 948 | |
| 949 | /* record the number of vregs we used. */ |
| 950 | env->code->n_vregs = env->vreg_ctr; |
| 951 | return env->code; |
| 952 | } |
| 953 | |
| 954 | |
| 955 | |
| 956 | |
| 957 | |
| 958 | /*---------------------------------------------------------------*/ |
| 959 | /*--- end host-x86/isel.c ---*/ |
| 960 | /*---------------------------------------------------------------*/ |