/*
=================
VM_Compile
=================
*/
void VM_Compile( vm_t *vm, vmHeader_t *header ) {
int op;
int maxLength;
int v;
int i;
qboolean opt;
// allocate a very large temp buffer, we will shrink it later
maxLength = header->codeLength * 8;
buf = (unsigned char *)Z_Malloc( maxLength, TAG_VM, qtrue );
jused = (unsigned char *)Z_Malloc(header->instructionCount + 2, TAG_VM, qtrue );
Com_Memset(jused, 0, header->instructionCount+2);
for(pass=0;pass<2;pass++) {
oc0 = -23423;
oc1 = -234354;
pop0 = -43435;
pop1 = -545455;
// translate all instructions
pc = 0;
instruction = 0;
code = (byte *)header + header->codeOffset;
compiledOfs = 0;
LastCommand = LAST_COMMAND_NONE;
while ( instruction < header->instructionCount ) {
if ( compiledOfs > maxLength - 16 ) {
Com_Error( ERR_FATAL, "VM_CompileX86: maxLength exceeded" );
}
vm->instructionPointers[ instruction ] = compiledOfs;
instruction++;
if ( pc > header->codeLength ) {
Com_Error( ERR_FATAL, "VM_CompileX86: pc > header->codeLength" );
}
op = code[ pc ];
pc++;
switch ( op ) {
case 0:
break;
case OP_BREAK:
EmitString( "CC" ); // int 3
break;
case OP_ENTER:
EmitString( "81 EE" ); // sub esi, 0x12345678
Emit4( Constant4() );
break;
case OP_CONST:
if (code[pc+4] == OP_LOAD4) {
EmitAddEDI4(vm);
EmitString( "BB" ); // mov ebx, 0x12345678
Emit4( (Constant4()&vm->dataMask) + (int)vm->dataBase);
EmitString( "8B 03" ); // mov eax, dword ptr [ebx]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
pc++; // OP_LOAD4
instruction += 1;
break;
}
if (code[pc+4] == OP_LOAD2) {
EmitAddEDI4(vm);
EmitString( "BB" ); // mov ebx, 0x12345678
Emit4( (Constant4()&vm->dataMask) + (int)vm->dataBase);
EmitString( "0F B7 03" ); // movzx eax, word ptr [ebx]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
pc++; // OP_LOAD4
instruction += 1;
break;
}
if (code[pc+4] == OP_LOAD1) {
EmitAddEDI4(vm);
EmitString( "BB" ); // mov ebx, 0x12345678
Emit4( (Constant4()&vm->dataMask) + (int)vm->dataBase);
EmitString( "0F B6 03" ); // movzx eax, byte ptr [ebx]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
pc++; // OP_LOAD4
instruction += 1;
break;
}
if (code[pc+4] == OP_STORE4) {
opt = EmitMovEBXEDI(vm, (vm->dataMask & ~3));
EmitString( "B8" ); // mov eax, 0x12345678
Emit4( Constant4() );
// if (!opt) {
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask & ~3 );
// }
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_STORE4
instruction += 1;
break;
}
if (code[pc+4] == OP_STORE2) {
opt = EmitMovEBXEDI(vm, (vm->dataMask & ~1));
EmitString( "B8" ); // mov eax, 0x12345678
Emit4( Constant4() );
// if (!opt) {
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask & ~1 );
// }
EmitString( "66 89 83" ); // mov word ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_STORE4
instruction += 1;
break;
}
if (code[pc+4] == OP_STORE1) {
opt = EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "B8" ); // mov eax, 0x12345678
Emit4( Constant4() );
// if (!opt) {
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask );
// }
EmitString( "88 83" ); // mov byte ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_STORE4
instruction += 1;
break;
}
if (code[pc+4] == OP_ADD) {
EmitString( "81 07" ); // add dword ptr [edi], 0x1234567
Emit4( Constant4() );
pc++; // OP_ADD
instruction += 1;
break;
}
if (code[pc+4] == OP_SUB) {
EmitString( "81 2F" ); // sub dword ptr [edi], 0x1234567
Emit4( Constant4() );
pc++; // OP_ADD
instruction += 1;
break;
}
EmitAddEDI4(vm);
EmitString( "C7 07" ); // mov dword ptr [edi], 0x12345678
lastConst = Constant4();
Emit4( lastConst );
if (code[pc] == OP_JUMP) {
jused[lastConst] = 1;
}
break;
case OP_LOCAL:
EmitAddEDI4(vm);
EmitString( "8D 86" ); // lea eax, [0x12345678 + esi]
oc0 = oc1;
oc1 = Constant4();
Emit4( oc1 );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_ARG:
EmitMovEAXEDI(vm); // mov eax,dword ptr [edi]
EmitString( "89 86" ); // mov dword ptr [esi+database],eax
// FIXME: range check
Emit4( Constant1() + (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_CALL:
EmitString( "C7 86" ); // mov dword ptr [esi+database],0x12345678
Emit4( (int)vm->dataBase );
Emit4( pc );
EmitString( "FF 15" ); // call asmCallPtr
Emit4( (int)&asmCallPtr );
break;
case OP_PUSH:
EmitAddEDI4(vm);
break;
case OP_POP:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_LEAVE:
v = Constant4();
EmitString( "81 C6" ); // add esi, 0x12345678
Emit4( v );
EmitString( "C3" ); // ret
break;
case OP_LOAD4:
if (code[pc] == OP_CONST && code[pc+5] == OP_ADD && code[pc+6] == OP_STORE4) {
if (oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
compiledOfs -= 11;
vm->instructionPointers[ instruction-1 ] = compiledOfs;
}
pc++; // OP_CONST
v = Constant4();
EmitMovEBXEDI(vm, vm->dataMask);
if (v == 1 && oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
EmitString( "FF 83"); // inc dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
} else {
EmitString( "8B 83" ); // mov eax, dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
EmitString( "05" ); // add eax, const
Emit4( v );
if (oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
} else {
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "8B 1F" ); // mov ebx, dword ptr [edi]
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
}
}
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_ADD
pc++; // OP_STORE
instruction += 3;
break;
}
if (code[pc] == OP_CONST && code[pc+5] == OP_SUB && code[pc+6] == OP_STORE4) {
if (oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
compiledOfs -= 11;
vm->instructionPointers[ instruction-1 ] = compiledOfs;
}
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "8B 83" ); // mov eax, dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
pc++; // OP_CONST
v = Constant4();
if (v == 1 && oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
EmitString( "FF 8B"); // dec dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
} else {
EmitString( "2D" ); // sub eax, const
Emit4( v );
if (oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
} else {
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "8B 1F" ); // mov ebx, dword ptr [edi]
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
}
}
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_SUB
pc++; // OP_STORE
instruction += 3;
break;
}
if (buf[compiledOfs-2] == 0x89 && buf[compiledOfs-1] == 0x07) {
compiledOfs -= 2;
vm->instructionPointers[ instruction-1 ] = compiledOfs;
EmitString( "8B 80"); // mov eax, dword ptr [eax + 0x1234567]
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
}
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "8B 83" ); // mov eax, dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_LOAD2:
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "0F B7 83" ); // movzx eax, word ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_LOAD1:
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "0F B6 83" ); // movzx eax, byte ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_STORE4:
EmitMovEAXEDI(vm);
EmitString( "8B 5F FC" ); // mov ebx, dword ptr [edi-4]
// if (pop1 != OP_CALL) {
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask & ~3 );
// }
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
break;
case OP_STORE2:
EmitMovEAXEDI(vm);
EmitString( "8B 5F FC" ); // mov ebx, dword ptr [edi-4]
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask & ~1 );
EmitString( "66 89 83" ); // mov word ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
break;
case OP_STORE1:
EmitMovEAXEDI(vm);
EmitString( "8B 5F FC" ); // mov ebx, dword ptr [edi-4]
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask );
EmitString( "88 83" ); // mov byte ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
break;
case OP_EQ:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "75 06" ); // jne +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_NE:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "74 06" ); // je +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LTI:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "7D 06" ); // jnl +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LEI:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "7F 06" ); // jnle +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GTI:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "7E 06" ); // jng +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GEI:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "7C 06" ); // jnge +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LTU:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "73 06" ); // jnb +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LEU:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "77 06" ); // jnbe +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GTU:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "76 06" ); // jna +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GEU:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "72 06" ); // jnae +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_EQF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 40" ); // test ah,0x40
EmitString( "74 06" ); // je +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_NEF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 40" ); // test ah,0x40
EmitString( "75 06" ); // jne +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LTF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 01" ); // test ah,0x01
EmitString( "74 06" ); // je +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LEF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 41" ); // test ah,0x41
EmitString( "74 06" ); // je +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GTF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 41" ); // test ah,0x41
EmitString( "75 06" ); // jne +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GEF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 01" ); // test ah,0x01
EmitString( "75 06" ); // jne +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_NEGI:
EmitString( "F7 1F" ); // neg dword ptr [edi]
break;
case OP_ADD:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "01 47 FC" ); // add dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_SUB:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "29 47 FC" ); // sub dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_DIVI:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "99" ); // cdq
EmitString( "F7 3F" ); // idiv dword ptr [edi]
EmitString( "89 47 FC" ); // mov dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_DIVU:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "33 D2" ); // xor edx, edx
EmitString( "F7 37" ); // div dword ptr [edi]
EmitString( "89 47 FC" ); // mov dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_MODI:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "99" ); // cdq
EmitString( "F7 3F" ); // idiv dword ptr [edi]
EmitString( "89 57 FC" ); // mov dword ptr [edi-4],edx
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_MODU:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "33 D2" ); // xor edx, edx
EmitString( "F7 37" ); // div dword ptr [edi]
EmitString( "89 57 FC" ); // mov dword ptr [edi-4],edx
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_MULI:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "F7 2F" ); // imul dword ptr [edi]
EmitString( "89 47 FC" ); // mov dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_MULU:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "F7 27" ); // mul dword ptr [edi]
EmitString( "89 47 FC" ); // mov dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_BAND:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "21 47 FC" ); // and dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_BOR:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "09 47 FC" ); // or dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_BXOR:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "31 47 FC" ); // xor dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_BCOM:
EmitString( "F7 17" ); // not dword ptr [edi]
break;
case OP_LSH:
EmitString( "8B 0F" ); // mov ecx, dword ptr [edi]
EmitString( "D3 67 FC" ); // shl dword ptr [edi-4], cl
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_RSHI:
EmitString( "8B 0F" ); // mov ecx, dword ptr [edi]
EmitString( "D3 7F FC" ); // sar dword ptr [edi-4], cl
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_RSHU:
EmitString( "8B 0F" ); // mov ecx, dword ptr [edi]
EmitString( "D3 6F FC" ); // shr dword ptr [edi-4], cl
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_NEGF:
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "D9 E0" ); // fchs
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_ADDF:
EmitString( "D9 47 FC" ); // fld dword ptr [edi-4]
EmitString( "D8 07" ); // fadd dword ptr [edi]
EmitString( "D9 5F FC" ); // fstp dword ptr [edi-4]
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_SUBF:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "D8 67 04" ); // fsub dword ptr [edi+4]
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_DIVF:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "D8 77 04" ); // fdiv dword ptr [edi+4]
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_MULF:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "D8 4f 04" ); // fmul dword ptr [edi+4]
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_CVIF:
EmitString( "DB 07" ); // fild dword ptr [edi]
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_CVFI:
#ifndef FTOL_PTR // WHENHELLISFROZENOVER // bk001213 - was used in 1.17
// not IEEE complient, but simple and fast
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "DB 1F" ); // fistp dword ptr [edi]
#else // FTOL_PTR
// call the library conversion function
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "FF 15" ); // call ftolPtr
Emit4( (int)&ftolPtr );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
#endif
break;
case OP_SEX8:
EmitString( "0F BE 07" ); // movsx eax, byte ptr [edi]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_SEX16:
EmitString( "0F BF 07" ); // movsx eax, word ptr [edi]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_BLOCK_COPY:
// FIXME: range check
EmitString( "56" ); // push esi
EmitString( "57" ); // push edi
EmitString( "8B 37" ); // mov esi,[edi]
EmitString( "8B 7F FC" ); // mov edi,[edi-4]
EmitString( "B9" ); // mov ecx,0x12345678
Emit4( Constant4() >> 2 );
EmitString( "B8" ); // mov eax, datamask
Emit4( vm->dataMask );
EmitString( "BB" ); // mov ebx, database
Emit4( (int)vm->dataBase );
EmitString( "23 F0" ); // and esi, eax
EmitString( "03 F3" ); // add esi, ebx
EmitString( "23 F8" ); // and edi, eax
EmitString( "03 FB" ); // add edi, ebx
EmitString( "F3 A5" ); // rep movsd
EmitString( "5F" ); // pop edi
EmitString( "5E" ); // pop esi
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
break;
case OP_JUMP:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "8B 47 04" ); // mov eax,dword ptr [edi+4]
// FIXME: range check
EmitString( "FF 24 85" ); // jmp dword ptr [instructionPointers + eax * 4]
Emit4( (int)vm->instructionPointers );
break;
default:
Com_Error( ERR_DROP, "VM_CompileX86: bad opcode %i at offset %i", op, pc );
}
pop0 = pop1;
pop1 = op;
}
}
// copy to an exact size buffer on the hunk
vm->codeLength = compiledOfs;
vm->codeBase = (unsigned char *)Hunk_Alloc( compiledOfs, h_low );
Com_Memcpy( vm->codeBase, buf, compiledOfs );
Z_Free( buf );
Z_Free( jused );
Com_Printf( "VM file %s compiled to %i bytes of code\n", vm->name, compiledOfs);
// offset all the instruction pointers for the new location
for ( i = 0 ; i < header->instructionCount ; i++ ) {
vm->instructionPointers[i] += (int)vm->codeBase;
}
#if 0 // ndef _WIN32
// Must make the newly generated code executable
{
int r;
unsigned long addr;
int psize = getpagesize();
addr = ((int)vm->codeBase & ~(psize-1)) - psize;
r = mprotect((char*)addr, vm->codeLength + (int)vm->codeBase - addr + psize,
PROT_READ | PROT_WRITE | PROT_EXEC );
if (r < 0)
Com_Error( ERR_FATAL, "mprotect failed to change PROT_EXEC" );
}
#endif
}
/*
=================
VM_Compile
=================
*/
void VM_Compile( vm_t *vm, vmHeader_t *header ) {
int op;
int maxLength;
int v;
int i;
// allocate a very large temp buffer, we will shrink it later
maxLength = header->codeLength * 8;
buf = Z_Malloc( maxLength );
jused = Z_Malloc(header->instructionCount + 2 );
Com_Memset(jused, 0, header->instructionCount+2);
// ensure that the optimisation pass knows about all the jump
// table targets
for( i = 0; i < vm->numJumpTableTargets; i++ ) {
jused[ *(int *)(vm->jumpTableTargets + ( i * sizeof( int ) ) ) ] = 1;
}
for(pass=0;pass<2;pass++) {
oc0 = -23423;
oc1 = -234354;
pop0 = -43435;
pop1 = -545455;
// translate all instructions
pc = 0;
instruction = 0;
code = (byte *)header + header->codeOffset;
compiledOfs = 0;
LastCommand = LAST_COMMAND_NONE;
while ( instruction < header->instructionCount ) {
if ( compiledOfs > maxLength - 16 ) {
Com_Error( ERR_FATAL, "VM_CompileX86: maxLength exceeded" );
}
vm->instructionPointers[ instruction ] = compiledOfs;
instruction++;
if ( pc > header->codeLength ) {
Com_Error( ERR_FATAL, "VM_CompileX86: pc > header->codeLength" );
}
op = code[ pc ];
pc++;
switch ( op ) {
case 0:
break;
case OP_BREAK:
EmitString( "CC" ); // int 3
break;
case OP_ENTER:
EmitString( "81 EE" ); // sub esi, 0x12345678
Emit4( Constant4() );
break;
case OP_CONST:
if (code[pc+4] == OP_LOAD4) {
EmitAddEDI4(vm);
EmitString( "BB" ); // mov ebx, 0x12345678
Emit4( (Constant4()&vm->dataMask) + (int)vm->dataBase);
EmitString( "8B 03" ); // mov eax, dword ptr [ebx]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
pc++; // OP_LOAD4
instruction += 1;
break;
}
if (code[pc+4] == OP_LOAD2) {
EmitAddEDI4(vm);
EmitString( "BB" ); // mov ebx, 0x12345678
Emit4( (Constant4()&vm->dataMask) + (int)vm->dataBase);
EmitString( "0F B7 03" ); // movzx eax, word ptr [ebx]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
pc++; // OP_LOAD4
instruction += 1;
break;
}
if (code[pc+4] == OP_LOAD1) {
EmitAddEDI4(vm);
EmitString( "BB" ); // mov ebx, 0x12345678
Emit4( (Constant4()&vm->dataMask) + (int)vm->dataBase);
EmitString( "0F B6 03" ); // movzx eax, byte ptr [ebx]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
pc++; // OP_LOAD4
instruction += 1;
break;
}
if (code[pc+4] == OP_STORE4) {
EmitMovEBXEDI(vm, (vm->dataMask & ~3));
EmitString( "B8" ); // mov eax, 0x12345678
Emit4( Constant4() );
// if (!opt) {
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask & ~3 );
// }
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_STORE4
instruction += 1;
break;
}
if (code[pc+4] == OP_STORE2) {
EmitMovEBXEDI(vm, (vm->dataMask & ~1));
EmitString( "B8" ); // mov eax, 0x12345678
Emit4( Constant4() );
// if (!opt) {
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask & ~1 );
// }
EmitString( "66 89 83" ); // mov word ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_STORE4
instruction += 1;
break;
}
if (code[pc+4] == OP_STORE1) {
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "B8" ); // mov eax, 0x12345678
Emit4( Constant4() );
// if (!opt) {
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask );
// }
EmitString( "88 83" ); // mov byte ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_STORE4
instruction += 1;
break;
}
if (code[pc+4] == OP_ADD) {
EmitString( "81 07" ); // add dword ptr [edi], 0x1234567
Emit4( Constant4() );
pc++; // OP_ADD
instruction += 1;
break;
}
if (code[pc+4] == OP_SUB) {
EmitString( "81 2F" ); // sub dword ptr [edi], 0x1234567
Emit4( Constant4() );
pc++; // OP_ADD
instruction += 1;
break;
}
EmitAddEDI4(vm);
EmitString( "C7 07" ); // mov dword ptr [edi], 0x12345678
lastConst = Constant4();
Emit4( lastConst );
if (code[pc] == OP_JUMP) {
jused[lastConst] = 1;
}
break;
case OP_LOCAL:
EmitAddEDI4(vm);
EmitString( "8D 86" ); // lea eax, [0x12345678 + esi]
oc0 = oc1;
oc1 = Constant4();
Emit4( oc1 );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_ARG:
EmitMovEAXEDI(vm); // mov eax,dword ptr [edi]
EmitString( "89 86" ); // mov dword ptr [esi+database],eax
// FIXME: range check
Emit4( Constant1() + (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_CALL:
EmitString( "C7 86" ); // mov dword ptr [esi+database],0x12345678
Emit4( (int)vm->dataBase );
Emit4( pc );
EmitString( "FF 15" ); // call asmCallPtr
Emit4( (int)&asmCallPtr );
break;
case OP_PUSH:
EmitAddEDI4(vm);
break;
case OP_POP:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_LEAVE:
v = Constant4();
EmitString( "81 C6" ); // add esi, 0x12345678
Emit4( v );
EmitString( "C3" ); // ret
break;
case OP_LOAD4:
if (code[pc] == OP_CONST && code[pc+5] == OP_ADD && code[pc+6] == OP_STORE4) {
if (oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
compiledOfs -= 11;
vm->instructionPointers[ instruction-1 ] = compiledOfs;
}
pc++; // OP_CONST
v = Constant4();
EmitMovEBXEDI(vm, vm->dataMask);
if (v == 1 && oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
EmitString( "FF 83"); // inc dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
} else {
EmitString( "8B 83" ); // mov eax, dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
EmitString( "05" ); // add eax, const
Emit4( v );
if (oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
} else {
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "8B 1F" ); // mov ebx, dword ptr [edi]
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
}
}
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_ADD
pc++; // OP_STORE
instruction += 3;
break;
}
if (code[pc] == OP_CONST && code[pc+5] == OP_SUB && code[pc+6] == OP_STORE4) {
if (oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
compiledOfs -= 11;
vm->instructionPointers[ instruction-1 ] = compiledOfs;
}
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "8B 83" ); // mov eax, dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
pc++; // OP_CONST
v = Constant4();
if (v == 1 && oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
EmitString( "FF 8B"); // dec dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
} else {
EmitString( "2D" ); // sub eax, const
Emit4( v );
if (oc0 == oc1 && pop0 == OP_LOCAL && pop1 == OP_LOCAL) {
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
} else {
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "8B 1F" ); // mov ebx, dword ptr [edi]
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
}
}
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
pc++; // OP_SUB
pc++; // OP_STORE
instruction += 3;
break;
}
if (buf[compiledOfs-2] == 0x89 && buf[compiledOfs-1] == 0x07) {
compiledOfs -= 2;
vm->instructionPointers[ instruction-1 ] = compiledOfs;
EmitString( "8B 80"); // mov eax, dword ptr [eax + 0x1234567]
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
}
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "8B 83" ); // mov eax, dword ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_LOAD2:
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "0F B7 83" ); // movzx eax, word ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_LOAD1:
EmitMovEBXEDI(vm, vm->dataMask);
EmitString( "0F B6 83" ); // movzx eax, byte ptr [ebx + 0x12345678]
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_STORE4:
EmitMovEAXEDI(vm);
EmitString( "8B 5F FC" ); // mov ebx, dword ptr [edi-4]
// if (pop1 != OP_CALL) {
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask & ~3 );
// }
EmitString( "89 83" ); // mov dword ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
break;
case OP_STORE2:
EmitMovEAXEDI(vm);
EmitString( "8B 5F FC" ); // mov ebx, dword ptr [edi-4]
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask & ~1 );
EmitString( "66 89 83" ); // mov word ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
break;
case OP_STORE1:
EmitMovEAXEDI(vm);
EmitString( "8B 5F FC" ); // mov ebx, dword ptr [edi-4]
// EmitString( "81 E3" ); // and ebx, 0x12345678
// Emit4( vm->dataMask );
EmitString( "88 83" ); // mov byte ptr [ebx+0x12345678], eax
Emit4( (int)vm->dataBase );
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
break;
case OP_EQ:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "75 06" ); // jne +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_NE:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "74 06" ); // je +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LTI:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "7D 06" ); // jnl +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LEI:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "7F 06" ); // jnle +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GTI:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "7E 06" ); // jng +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GEI:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "7C 06" ); // jnge +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LTU:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "73 06" ); // jnb +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LEU:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "77 06" ); // jnbe +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GTU:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "76 06" ); // jna +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GEU:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "8B 47 04" ); // mov eax, dword ptr [edi+4]
EmitString( "3B 47 08" ); // cmp eax, dword ptr [edi+8]
EmitString( "72 06" ); // jnae +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_EQF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 40" ); // test ah,0x40
EmitString( "74 06" ); // je +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_NEF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 40" ); // test ah,0x40
EmitString( "75 06" ); // jne +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LTF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 01" ); // test ah,0x01
EmitString( "74 06" ); // je +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_LEF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 41" ); // test ah,0x41
EmitString( "74 06" ); // je +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GTF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 41" ); // test ah,0x41
EmitString( "75 06" ); // jne +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_GEF:
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
EmitString( "D9 47 04" ); // fld dword ptr [edi+4]
EmitString( "D8 5F 08" ); // fcomp dword ptr [edi+8]
EmitString( "DF E0" ); // fnstsw ax
EmitString( "F6 C4 01" ); // test ah,0x01
EmitString( "75 06" ); // jne +6
EmitString( "FF 25" ); // jmp [0x12345678]
v = Constant4();
jused[v] = 1;
Emit4( (int)vm->instructionPointers + v*4 );
break;
case OP_NEGI:
EmitString( "F7 1F" ); // neg dword ptr [edi]
break;
case OP_ADD:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "01 47 FC" ); // add dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_SUB:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "29 47 FC" ); // sub dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_DIVI:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "99" ); // cdq
EmitString( "F7 3F" ); // idiv dword ptr [edi]
EmitString( "89 47 FC" ); // mov dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_DIVU:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "33 D2" ); // xor edx, edx
EmitString( "F7 37" ); // div dword ptr [edi]
EmitString( "89 47 FC" ); // mov dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_MODI:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "99" ); // cdq
EmitString( "F7 3F" ); // idiv dword ptr [edi]
EmitString( "89 57 FC" ); // mov dword ptr [edi-4],edx
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_MODU:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "33 D2" ); // xor edx, edx
EmitString( "F7 37" ); // div dword ptr [edi]
EmitString( "89 57 FC" ); // mov dword ptr [edi-4],edx
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_MULI:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "F7 2F" ); // imul dword ptr [edi]
EmitString( "89 47 FC" ); // mov dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_MULU:
EmitString( "8B 47 FC" ); // mov eax,dword ptr [edi-4]
EmitString( "F7 27" ); // mul dword ptr [edi]
EmitString( "89 47 FC" ); // mov dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_BAND:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "21 47 FC" ); // and dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_BOR:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "09 47 FC" ); // or dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_BXOR:
EmitMovEAXEDI(vm); // mov eax, dword ptr [edi]
EmitString( "31 47 FC" ); // xor dword ptr [edi-4],eax
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_BCOM:
EmitString( "F7 17" ); // not dword ptr [edi]
break;
case OP_LSH:
EmitString( "8B 0F" ); // mov ecx, dword ptr [edi]
EmitString( "D3 67 FC" ); // shl dword ptr [edi-4], cl
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_RSHI:
EmitString( "8B 0F" ); // mov ecx, dword ptr [edi]
EmitString( "D3 7F FC" ); // sar dword ptr [edi-4], cl
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_RSHU:
EmitString( "8B 0F" ); // mov ecx, dword ptr [edi]
EmitString( "D3 6F FC" ); // shr dword ptr [edi-4], cl
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_NEGF:
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "D9 E0" ); // fchs
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_ADDF:
EmitString( "D9 47 FC" ); // fld dword ptr [edi-4]
EmitString( "D8 07" ); // fadd dword ptr [edi]
EmitString( "D9 5F FC" ); // fstp dword ptr [edi-4]
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
break;
case OP_SUBF:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "D8 67 04" ); // fsub dword ptr [edi+4]
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_DIVF:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "D8 77 04" ); // fdiv dword ptr [edi+4]
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_MULF:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "D8 4f 04" ); // fmul dword ptr [edi+4]
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_CVIF:
EmitString( "DB 07" ); // fild dword ptr [edi]
EmitString( "D9 1F" ); // fstp dword ptr [edi]
break;
case OP_CVFI:
#ifndef FTOL_PTR // WHENHELLISFROZENOVER
// not IEEE complient, but simple and fast
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "DB 1F" ); // fistp dword ptr [edi]
#else // FTOL_PTR
// call the library conversion function
EmitString( "D9 07" ); // fld dword ptr [edi]
EmitString( "FF 15" ); // call ftolPtr
Emit4( (int)&ftolPtr );
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
#endif
break;
case OP_SEX8:
EmitString( "0F BE 07" ); // movsx eax, byte ptr [edi]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_SEX16:
EmitString( "0F BF 07" ); // movsx eax, word ptr [edi]
EmitCommand(LAST_COMMAND_MOV_EDI_EAX); // mov dword ptr [edi], eax
break;
case OP_BLOCK_COPY:
// FIXME: range check
EmitString( "56" ); // push esi
EmitString( "57" ); // push edi
EmitString( "8B 37" ); // mov esi,[edi]
EmitString( "8B 7F FC" ); // mov edi,[edi-4]
EmitString( "B9" ); // mov ecx,0x12345678
Emit4( Constant4() >> 2 );
EmitString( "B8" ); // mov eax, datamask
Emit4( vm->dataMask );
EmitString( "BB" ); // mov ebx, database
Emit4( (int)vm->dataBase );
EmitString( "23 F0" ); // and esi, eax
EmitString( "03 F3" ); // add esi, ebx
EmitString( "23 F8" ); // and edi, eax
EmitString( "03 FB" ); // add edi, ebx
EmitString( "F3 A5" ); // rep movsd
EmitString( "5F" ); // pop edi
EmitString( "5E" ); // pop esi
EmitCommand(LAST_COMMAND_SUB_DI_8); // sub edi, 8
break;
case OP_JUMP:
EmitCommand(LAST_COMMAND_SUB_DI_4); // sub edi, 4
EmitString( "8B 47 04" ); // mov eax,dword ptr [edi+4]
// FIXME: range check
EmitString( "FF 24 85" ); // jmp dword ptr [instructionPointers + eax * 4]
Emit4( (int)vm->instructionPointers );
break;
default:
Com_Error( ERR_DROP, "VM_CompileX86: bad opcode %i at offset %i", op, pc );
break;
}
pop0 = pop1;
pop1 = op;
}
}
// copy to an exact size buffer on the hunk
vm->codeLength = compiledOfs;
#ifdef VM_X86_MMAP
#if defined(__OpenBSD__)
// OpenBSD mmap(2) requires PROT_READ with PROT_WRITE
vm->codeBase = mmap(NULL, compiledOfs, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANON, -1, 0);
#else
vm->codeBase = mmap(NULL, compiledOfs, PROT_WRITE, MAP_SHARED|MAP_ANON, -1, 0);
#endif
if(vm->codeBase == (void*)-1)
Com_Error(ERR_DROP, "VM_CompileX86: can't mmap memory");
#elif _WIN32
// allocate memory with EXECUTE permissions under windows.
vm->codeBase = VirtualAlloc(NULL, compiledOfs, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if(!vm->codeBase)
Com_Error(ERR_DROP, "VM_CompileX86: VirtualAlloc failed");
#else
vm->codeBase = malloc(compiledOfs);
#endif
Com_Memcpy( vm->codeBase, buf, compiledOfs );
#ifdef VM_X86_MMAP
if(mprotect(vm->codeBase, compiledOfs, PROT_READ|PROT_EXEC))
Com_Error(ERR_DROP, "VM_CompileX86: mprotect failed");
#elif _WIN32
{
DWORD oldProtect = 0;
// remove write permissions.
if(!VirtualProtect(vm->codeBase, compiledOfs, PAGE_EXECUTE_READ, &oldProtect))
Com_Error(ERR_DROP, "VM_CompileX86: VirtualProtect failed");
}
#endif
Z_Free( buf );
Z_Free( jused );
Com_Printf( "VM file %s compiled to %i bytes of code\n", vm->name, compiledOfs );
vm->destroy = VM_Destroy_Compiled;
// offset all the instruction pointers for the new location
for ( i = 0 ; i < header->instructionCount ; i++ ) {
vm->instructionPointers[i] += (int)vm->codeBase;
}
}
