mirror of
https://github.com/DrBeef/ioq3quest.git
synced 2024-11-23 04:12:39 +00:00
Various fixes to vm_interpreted.c:
- Add opStack protection - Fix dataMask check for OP_BLOCK_COPY - Add instruction number check for conditional jumps - Make errors in VM_PrepareInterpreter nonfatal
This commit is contained in:
Thilo Schulz
parent
af5020c57c
commit
83522282f1
5 changed files with 156 additions and 169 deletions
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@ -949,3 +949,25 @@ void VM_LogSyscalls( int *args ) {
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fprintf(f, "%i: %p (%i) = %i %i %i %i\n", callnum, (void*)(args - (int *)currentVM->dataBase),
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args[0], args[1], args[2], args[3], args[4] );
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}
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/*
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=================
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VM_BlockCopy
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Executes a block copy operation within currentVM data space
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=================
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*/
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void VM_BlockCopy(unsigned int dest, unsigned int src, size_t n)
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{
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unsigned int dataMask = currentVM->dataMask;
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if ((dest & dataMask) != dest
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|| (src & dataMask) != src
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|| ((dest + n) & dataMask) != dest + n
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|| ((src + n) & dataMask) != src + n)
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{
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Com_Error(ERR_DROP, "OP_BLOCK_COPY out of range!");
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}
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Com_Memcpy(currentVM->dataBase + dest, currentVM->dataBase + src, n);
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}
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@ -192,9 +192,8 @@ void VM_PrepareInterpreter( vm_t *vm, vmHeader_t *header ) {
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op = (int)code[ byte_pc ];
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codeBase[int_pc] = op;
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if ( byte_pc > header->codeLength ) {
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Com_Error( ERR_FATAL, "VM_PrepareInterpreter: pc > header->codeLength" );
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}
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if(byte_pc > header->codeLength)
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Com_Error(ERR_DROP, "VM_PrepareInterpreter: pc > header->codeLength");
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byte_pc++;
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int_pc++;
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@ -265,6 +264,9 @@ void VM_PrepareInterpreter( vm_t *vm, vmHeader_t *header ) {
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case OP_LEF:
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case OP_GTF:
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case OP_GEF:
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if(codeBase[int_pc] < 0 || codeBase[int_pc] > vm->instructionCount)
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Com_Error(ERR_DROP, "VM_PrepareInterpreter: Jump to invalid instruction number");
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// codeBase[pc] is the instruction index. Convert that into an offset into
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//the int-aligned codeBase[] by the lookup table.
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codeBase[int_pc] = vm->instructionPointers[codeBase[int_pc]];
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@ -312,11 +314,12 @@ locals from sp
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==============
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*/
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#define DEBUGSTR va("%s%i", VM_Indent(vm), opStack-stack )
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#define DEBUGSTR va("%s%i", VM_Indent(vm), opStackOfs)
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int VM_CallInterpreted( vm_t *vm, int *args ) {
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int stack[OPSTACK_SIZE];
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int *opStack;
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byte stack[OPSTACK_SIZE + 15];
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register int *opStack;
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register uint8_t opStackOfs;
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int programCounter;
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int programStack;
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int stackOnEntry;
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@ -345,10 +348,6 @@ int VM_CallInterpreted( vm_t *vm, int *args ) {
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codeImage = (int *)vm->codeBase;
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dataMask = vm->dataMask;
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// leave a free spot at start of stack so
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// that as long as opStack is valid, opStack-1 will
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// not corrupt anything
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opStack = stack;
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programCounter = 0;
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programStack -= 48;
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@ -368,6 +367,13 @@ int VM_CallInterpreted( vm_t *vm, int *args ) {
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VM_Debug(0);
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// leave a free spot at start of stack so
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// that as long as opStack is valid, opStack-1 will
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// not corrupt anything
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opStack = PADP(stack, 16);
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*opStack = 0xDEADBEEF;
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opStackOfs = 0;
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// vm_debugLevel=2;
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// main interpreter loop, will exit when a LEAVE instruction
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// grabs the -1 program counter
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@ -379,27 +385,23 @@ int VM_CallInterpreted( vm_t *vm, int *args ) {
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// unsigned int r2;
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nextInstruction:
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r0 = ((int *)opStack)[0];
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r1 = ((int *)opStack)[-1];
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r0 = opStack[opStackOfs];
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r1 = opStack[(uint8_t) (opStackOfs - 1)];
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nextInstruction2:
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#ifdef DEBUG_VM
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if ( (unsigned)programCounter >= vm->codeLength ) {
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Com_Error( ERR_DROP, "VM pc out of range" );
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}
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if ( opStack < stack ) {
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Com_Error( ERR_DROP, "VM opStack underflow" );
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}
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if ( opStack >= stack+OPSTACK_SIZE ) {
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Com_Error( ERR_DROP, "VM opStack overflow" );
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return 0;
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}
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if ( programStack <= vm->stackBottom ) {
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Com_Error( ERR_DROP, "VM stack overflow" );
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return 0;
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}
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if ( programStack & 3 ) {
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Com_Error( ERR_DROP, "VM program stack misaligned" );
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return 0;
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}
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if ( vm_debugLevel > 1 ) {
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@ -413,79 +415,67 @@ nextInstruction2:
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#ifdef DEBUG_VM
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default:
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Com_Error( ERR_DROP, "Bad VM instruction" ); // this should be scanned on load!
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return 0;
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#endif
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case OP_BREAK:
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vm->breakCount++;
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goto nextInstruction2;
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case OP_CONST:
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opStack++;
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opStackOfs++;
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r1 = r0;
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r0 = *opStack = r2;
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r0 = opStack[opStackOfs] = r2;
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programCounter += 1;
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goto nextInstruction2;
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case OP_LOCAL:
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opStack++;
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opStackOfs++;
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r1 = r0;
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r0 = *opStack = r2+programStack;
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r0 = opStack[opStackOfs] = r2+programStack;
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programCounter += 1;
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goto nextInstruction2;
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case OP_LOAD4:
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#ifdef DEBUG_VM
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if ( *opStack & 3 ) {
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if(opStack[opStackOfs] & 3)
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{
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Com_Error( ERR_DROP, "OP_LOAD4 misaligned" );
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return 0;
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}
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#endif
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r0 = *opStack = *(int *)&image[ r0&dataMask&~3 ];
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r0 = opStack[opStackOfs] = *(int *) &image[r0 & dataMask & ~3 ];
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goto nextInstruction2;
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case OP_LOAD2:
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r0 = *opStack = *(unsigned short *)&image[ r0&dataMask&~1 ];
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r0 = opStack[opStackOfs] = *(unsigned short *)&image[ r0&dataMask&~1 ];
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goto nextInstruction2;
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case OP_LOAD1:
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r0 = *opStack = image[ r0&dataMask ];
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r0 = opStack[opStackOfs] = image[ r0&dataMask ];
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goto nextInstruction2;
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case OP_STORE4:
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*(int *)&image[ r1&(dataMask & ~3) ] = r0;
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opStack -= 2;
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opStackOfs -= 2;
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goto nextInstruction;
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case OP_STORE2:
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*(short *)&image[ r1&(dataMask & ~1) ] = r0;
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opStack -= 2;
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opStackOfs -= 2;
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goto nextInstruction;
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case OP_STORE1:
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image[ r1&dataMask ] = r0;
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opStack -= 2;
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opStackOfs -= 2;
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goto nextInstruction;
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case OP_ARG:
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// single byte offset from programStack
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*(int *)&image[ (codeImage[programCounter] + programStack)&dataMask&~3 ] = r0;
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opStack--;
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opStackOfs--;
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programCounter += 1;
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goto nextInstruction;
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case OP_BLOCK_COPY:
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{
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int *src, *dest;
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int count, srci, desti;
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count = r2;
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// MrE: copy range check
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srci = r0 & dataMask;
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desti = r1 & dataMask;
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count = ((srci + count) & dataMask) - srci;
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count = ((desti + count) & dataMask) - desti;
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src = (int *)&image[ srci ];
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dest = (int *)&image[ desti ];
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memcpy(dest, src, count);
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programCounter += 1;
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opStack -= 2;
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}
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VM_BlockCopy(r1, r0, r2);
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programCounter += 1;
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opStackOfs -= 2;
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goto nextInstruction;
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case OP_CALL:
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@ -494,7 +484,7 @@ nextInstruction2:
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// jump to the location on the stack
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programCounter = r0;
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opStack--;
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opStackOfs--;
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if ( programCounter < 0 ) {
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// system call
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int r;
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@ -539,8 +529,8 @@ nextInstruction2:
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#endif
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// save return value
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opStack++;
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*opStack = r;
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opStackOfs++;
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opStack[opStackOfs] = r;
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programCounter = *(int *)&image[ programStack ];
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// vm->callLevel = temp;
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#ifdef DEBUG_VM
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@ -550,6 +540,7 @@ nextInstruction2:
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#endif
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} else if ( (unsigned)programCounter >= vm->instructionCount ) {
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Com_Error( ERR_DROP, "VM program counter out of range in OP_CALL" );
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return 0;
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} else {
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programCounter = vm->instructionPointers[ programCounter ];
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}
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@ -557,10 +548,10 @@ nextInstruction2:
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// push and pop are only needed for discarded or bad function return values
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case OP_PUSH:
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opStack++;
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opStackOfs++;
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goto nextInstruction;
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case OP_POP:
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opStack--;
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opStackOfs--;
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goto nextInstruction;
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case OP_ENTER:
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@ -607,6 +598,7 @@ nextInstruction2:
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goto done;
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} else if ( (unsigned)programCounter >= vm->codeLength ) {
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Com_Error( ERR_DROP, "VM program counter out of range in OP_LEAVE" );
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return 0;
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}
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goto nextInstruction;
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@ -618,15 +610,18 @@ nextInstruction2:
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case OP_JUMP:
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if ( (unsigned)r0 >= vm->instructionCount )
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{
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Com_Error( ERR_DROP, "VM program counter out of range in OP_JUMP" );
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return 0;
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}
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programCounter = vm->instructionPointers[ r0 ];
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opStack--;
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opStackOfs--;
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goto nextInstruction;
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case OP_EQ:
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opStack -= 2;
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opStackOfs -= 2;
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if ( r1 == r0 ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -636,7 +631,7 @@ nextInstruction2:
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}
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case OP_NE:
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opStack -= 2;
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opStackOfs -= 2;
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if ( r1 != r0 ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -646,7 +641,7 @@ nextInstruction2:
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}
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case OP_LTI:
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opStack -= 2;
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opStackOfs -= 2;
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if ( r1 < r0 ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -656,7 +651,7 @@ nextInstruction2:
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}
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case OP_LEI:
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opStack -= 2;
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opStackOfs -= 2;
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if ( r1 <= r0 ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -666,7 +661,7 @@ nextInstruction2:
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}
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case OP_GTI:
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opStack -= 2;
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opStackOfs -= 2;
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if ( r1 > r0 ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -676,7 +671,7 @@ nextInstruction2:
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}
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case OP_GEI:
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opStack -= 2;
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opStackOfs -= 2;
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if ( r1 >= r0 ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -686,7 +681,7 @@ nextInstruction2:
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}
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case OP_LTU:
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opStack -= 2;
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opStackOfs -= 2;
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if ( ((unsigned)r1) < ((unsigned)r0) ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -696,7 +691,7 @@ nextInstruction2:
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}
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case OP_LEU:
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opStack -= 2;
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opStackOfs -= 2;
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if ( ((unsigned)r1) <= ((unsigned)r0) ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -706,7 +701,7 @@ nextInstruction2:
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}
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case OP_GTU:
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opStack -= 2;
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opStackOfs -= 2;
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if ( ((unsigned)r1) > ((unsigned)r0) ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -716,7 +711,7 @@ nextInstruction2:
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}
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case OP_GEU:
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opStack -= 2;
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opStackOfs -= 2;
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if ( ((unsigned)r1) >= ((unsigned)r0) ) {
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programCounter = r2; //vm->instructionPointers[r2];
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goto nextInstruction;
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@ -726,68 +721,74 @@ nextInstruction2:
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}
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case OP_EQF:
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if ( ((float *)opStack)[-1] == *(float *)opStack ) {
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opStackOfs -= 2;
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if(((float *) opStack)[(uint8_t) (opStackOfs + 1)] == ((float *) opStack)[(uint8_t) (opStackOfs + 2)])
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{
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programCounter = r2; //vm->instructionPointers[r2];
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opStack -= 2;
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goto nextInstruction;
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} else {
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programCounter += 1;
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opStack -= 2;
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goto nextInstruction;
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}
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case OP_NEF:
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if ( ((float *)opStack)[-1] != *(float *)opStack ) {
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opStackOfs -= 2;
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if(((float *) opStack)[(uint8_t) (opStackOfs + 1)] != ((float *) opStack)[(uint8_t) (opStackOfs + 2)])
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{
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programCounter = r2; //vm->instructionPointers[r2];
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opStack -= 2;
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goto nextInstruction;
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} else {
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programCounter += 1;
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opStack -= 2;
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goto nextInstruction;
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}
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case OP_LTF:
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if ( ((float *)opStack)[-1] < *(float *)opStack ) {
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opStackOfs -= 2;
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if(((float *) opStack)[(uint8_t) (opStackOfs + 1)] < ((float *) opStack)[(uint8_t) (opStackOfs + 2)])
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{
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programCounter = r2; //vm->instructionPointers[r2];
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opStack -= 2;
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goto nextInstruction;
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} else {
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programCounter += 1;
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opStack -= 2;
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goto nextInstruction;
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}
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case OP_LEF:
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if ( ((float *)opStack)[-1] <= *(float *)opStack ) {
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opStackOfs -= 2;
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if(((float *) opStack)[(uint8_t) ((uint8_t) (opStackOfs + 1))] <= ((float *) opStack)[(uint8_t) ((uint8_t) (opStackOfs + 2))])
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{
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programCounter = r2; //vm->instructionPointers[r2];
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opStack -= 2;
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goto nextInstruction;
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} else {
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programCounter += 1;
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opStack -= 2;
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goto nextInstruction;
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}
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case OP_GTF:
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if ( ((float *)opStack)[-1] > *(float *)opStack ) {
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opStackOfs -= 2;
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if(((float *) opStack)[(uint8_t) (opStackOfs + 1)] > ((float *) opStack)[(uint8_t) (opStackOfs + 2)])
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{
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programCounter = r2; //vm->instructionPointers[r2];
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opStack -= 2;
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goto nextInstruction;
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} else {
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programCounter += 1;
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opStack -= 2;
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goto nextInstruction;
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}
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case OP_GEF:
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if ( ((float *)opStack)[-1] >= *(float *)opStack ) {
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opStackOfs -= 2;
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if(((float *) opStack)[(uint8_t) (opStackOfs + 1)] >= ((float *) opStack)[(uint8_t) (opStackOfs + 2)])
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{
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programCounter = r2; //vm->instructionPointers[r2];
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opStack -= 2;
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goto nextInstruction;
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} else {
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programCounter += 1;
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opStack -= 2;
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goto nextInstruction;
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}
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@ -795,101 +796,101 @@ nextInstruction2:
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//===================================================================
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case OP_NEGI:
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*opStack = -r0;
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opStack[opStackOfs] = -r0;
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goto nextInstruction;
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case OP_ADD:
|
||||
opStack[-1] = r1 + r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = r1 + r0;
|
||||
goto nextInstruction;
|
||||
case OP_SUB:
|
||||
opStack[-1] = r1 - r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = r1 - r0;
|
||||
goto nextInstruction;
|
||||
case OP_DIVI:
|
||||
opStack[-1] = r1 / r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = r1 / r0;
|
||||
goto nextInstruction;
|
||||
case OP_DIVU:
|
||||
opStack[-1] = ((unsigned)r1) / ((unsigned)r0);
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = ((unsigned) r1) / ((unsigned) r0);
|
||||
goto nextInstruction;
|
||||
case OP_MODI:
|
||||
opStack[-1] = r1 % r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = r1 % r0;
|
||||
goto nextInstruction;
|
||||
case OP_MODU:
|
||||
opStack[-1] = ((unsigned)r1) % (unsigned)r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = ((unsigned) r1) % ((unsigned) r0);
|
||||
goto nextInstruction;
|
||||
case OP_MULI:
|
||||
opStack[-1] = r1 * r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = r1 * r0;
|
||||
goto nextInstruction;
|
||||
case OP_MULU:
|
||||
opStack[-1] = ((unsigned)r1) * ((unsigned)r0);
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = ((unsigned) r1) * ((unsigned) r0);
|
||||
goto nextInstruction;
|
||||
|
||||
case OP_BAND:
|
||||
opStack[-1] = ((unsigned)r1) & ((unsigned)r0);
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = ((unsigned) r1) & ((unsigned) r0);
|
||||
goto nextInstruction;
|
||||
case OP_BOR:
|
||||
opStack[-1] = ((unsigned)r1) | ((unsigned)r0);
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = ((unsigned) r1) | ((unsigned) r0);
|
||||
goto nextInstruction;
|
||||
case OP_BXOR:
|
||||
opStack[-1] = ((unsigned)r1) ^ ((unsigned)r0);
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = ((unsigned) r1) ^ ((unsigned) r0);
|
||||
goto nextInstruction;
|
||||
case OP_BCOM:
|
||||
*opStack = ~ ((unsigned)r0);
|
||||
opStack[opStackOfs] = ~((unsigned) r0);
|
||||
goto nextInstruction;
|
||||
|
||||
case OP_LSH:
|
||||
opStack[-1] = r1 << r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = r1 << r0;
|
||||
goto nextInstruction;
|
||||
case OP_RSHI:
|
||||
opStack[-1] = r1 >> r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = r1 >> r0;
|
||||
goto nextInstruction;
|
||||
case OP_RSHU:
|
||||
opStack[-1] = ((unsigned)r1) >> r0;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
opStack[opStackOfs] = ((unsigned) r1) >> r0;
|
||||
goto nextInstruction;
|
||||
|
||||
case OP_NEGF:
|
||||
*(float *)opStack = -*(float *)opStack;
|
||||
((float *) opStack)[opStackOfs] = -((float *) opStack)[opStackOfs];
|
||||
goto nextInstruction;
|
||||
case OP_ADDF:
|
||||
*(float *)(opStack-1) = *(float *)(opStack-1) + *(float *)opStack;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
((float *) opStack)[opStackOfs] = ((float *) opStack)[opStackOfs] + ((float *) opStack)[(uint8_t) (opStackOfs + 1)];
|
||||
goto nextInstruction;
|
||||
case OP_SUBF:
|
||||
*(float *)(opStack-1) = *(float *)(opStack-1) - *(float *)opStack;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
((float *) opStack)[opStackOfs] = ((float *) opStack)[opStackOfs] - ((float *) opStack)[(uint8_t) (opStackOfs + 1)];
|
||||
goto nextInstruction;
|
||||
case OP_DIVF:
|
||||
*(float *)(opStack-1) = *(float *)(opStack-1) / *(float *)opStack;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
((float *) opStack)[opStackOfs] = ((float *) opStack)[opStackOfs] / ((float *) opStack)[(uint8_t) (opStackOfs + 1)];
|
||||
goto nextInstruction;
|
||||
case OP_MULF:
|
||||
*(float *)(opStack-1) = *(float *)(opStack-1) * *(float *)opStack;
|
||||
opStack--;
|
||||
opStackOfs--;
|
||||
((float *) opStack)[opStackOfs] = ((float *) opStack)[opStackOfs] * ((float *) opStack)[(uint8_t) (opStackOfs + 1)];
|
||||
goto nextInstruction;
|
||||
|
||||
case OP_CVIF:
|
||||
*(float *)opStack = (float)*opStack;
|
||||
((float *) opStack)[opStackOfs] = (float) opStack[opStackOfs];
|
||||
goto nextInstruction;
|
||||
case OP_CVFI:
|
||||
*opStack = (int) *(float *)opStack;
|
||||
opStack[opStackOfs] = (int) ((float *) opStack)[opStackOfs];
|
||||
goto nextInstruction;
|
||||
case OP_SEX8:
|
||||
*opStack = (signed char)*opStack;
|
||||
opStack[opStackOfs] = (signed char) opStack[opStackOfs];
|
||||
goto nextInstruction;
|
||||
case OP_SEX16:
|
||||
*opStack = (short)*opStack;
|
||||
opStack[opStackOfs] = (short) opStack[opStackOfs];
|
||||
goto nextInstruction;
|
||||
}
|
||||
}
|
||||
|
|
@ -897,12 +898,11 @@ nextInstruction2:
|
|||
done:
|
||||
vm->currentlyInterpreting = qfalse;
|
||||
|
||||
if ( opStack != &stack[1] ) {
|
||||
Com_Error( ERR_DROP, "Interpreter error: opStack = %ld", (long int) (opStack - stack) );
|
||||
}
|
||||
if (opStackOfs != 1 || *opStack != 0xDEADBEEF)
|
||||
Com_Error(ERR_DROP, "Interpreter error: opStack[0] = %X, opStackOfs = %d", opStack[0], opStackOfs);
|
||||
|
||||
vm->programStack = stackOnEntry;
|
||||
|
||||
// return the result
|
||||
return *opStack;
|
||||
return opStack[opStackOfs];
|
||||
}
|
||||
|
|
|
|||
|
|
@ -190,3 +190,5 @@ vmSymbol_t *VM_ValueToFunctionSymbol( vm_t *vm, int value );
|
|||
int VM_SymbolToValue( vm_t *vm, const char *symbol );
|
||||
const char *VM_ValueToSymbol( vm_t *vm, int value );
|
||||
void VM_LogSyscalls( int *args );
|
||||
|
||||
void VM_BlockCopy(unsigned int dest, unsigned int src, size_t n);
|
||||
|
|
|
|||
|
|
@ -386,28 +386,6 @@ static void ErrJump(void)
|
|||
exit(1);
|
||||
}
|
||||
|
||||
/*
|
||||
=================
|
||||
DoBlockCopy
|
||||
Executes OP_BLOCK_COPY
|
||||
=================
|
||||
*/
|
||||
|
||||
void DoBlockCopy(unsigned int dest, unsigned int src, size_t n)
|
||||
{
|
||||
unsigned int dataMask = currentVM->dataMask;
|
||||
|
||||
if ((dest & dataMask) != dest
|
||||
|| (src & dataMask) != src
|
||||
|| ((dest + n) & dataMask) != dest + n
|
||||
|| ((src + n) & dataMask) != src + n)
|
||||
{
|
||||
Com_Error(ERR_DROP, "OP_BLOCK_COPY out of range!");
|
||||
}
|
||||
|
||||
memcpy(currentVM->dataBase + dest, currentVM->dataBase + src, n);
|
||||
}
|
||||
|
||||
/*
|
||||
=================
|
||||
DoSyscall
|
||||
|
|
@ -493,7 +471,7 @@ static void DoSyscall(void)
|
|||
if(opStackOfs < 1)
|
||||
Com_Error(ERR_DROP, "VM_BLOCK_COPY failed due to corrupted opStack");
|
||||
|
||||
DoBlockCopy(opStackBase[opStackOfs - 1], opStackBase[opStackOfs], arg);
|
||||
VM_BlockCopy(opStackBase[(opStackOfs - 1)], opStackBase[opStackOfs], arg);
|
||||
break;
|
||||
default:
|
||||
Com_Error(ERR_DROP, "Unknown VM operation %d", syscallNum);
|
||||
|
|
|
|||
|
|
@ -381,21 +381,6 @@ static void* getentrypoint(vm_t* vm)
|
|||
return vm->codeBase;
|
||||
}
|
||||
|
||||
static void CROSSCALL block_copy_vm(unsigned dest, unsigned src, unsigned count)
|
||||
{
|
||||
unsigned dataMask = currentVM->dataMask;
|
||||
|
||||
if ((dest & dataMask) != dest
|
||||
|| (src & dataMask) != src
|
||||
|| ((dest+count) & dataMask) != dest + count
|
||||
|| ((src+count) & dataMask) != src + count)
|
||||
{
|
||||
Com_Error(ERR_DROP, "OP_BLOCK_COPY out of range!");
|
||||
}
|
||||
|
||||
memcpy(currentVM->dataBase+dest, currentVM->dataBase+src, count);
|
||||
}
|
||||
|
||||
static void CROSSCALL eop(void)
|
||||
{
|
||||
Com_Error(ERR_DROP, "End of program reached without return!");
|
||||
|
|
@ -782,7 +767,7 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
|
|||
emit("movl 4(%%r9, %%rbx, 4), %%edi"); // 1st argument dest
|
||||
emit("movl 8(%%r9, %%rbx, 4), %%rsi"); // 2nd argument src
|
||||
emit("movl $%d, %%edx", iarg); // 3rd argument count
|
||||
emit("movq $%"PRIu64", %%rax", (intptr_t) block_copy_vm);
|
||||
emit("movq $%"PRIu64", %%rax", (intptr_t) VM_BlockCopy);
|
||||
emit("callq *%%rax");
|
||||
emit("pop %%rsi");
|
||||
emit("addq %%rsi, %%rsp");
|
||||
|
|
|
|||
Loading…
Reference in a new issue