mirror of
https://github.com/DrBeef/ioq3quest.git
synced 2024-11-24 04:51:25 +00:00
913 lines
20 KiB
C
913 lines
20 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "vm_local.h"
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//#define DEBUG_VM
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#ifdef DEBUG_VM
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static char *opnames[256] = {
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"OP_UNDEF",
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"OP_IGNORE",
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"OP_BREAK",
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"OP_ENTER",
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"OP_LEAVE",
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"OP_CALL",
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"OP_PUSH",
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"OP_POP",
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"OP_CONST",
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"OP_LOCAL",
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"OP_JUMP",
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//-------------------
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"OP_EQ",
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"OP_NE",
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"OP_LTI",
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"OP_LEI",
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"OP_GTI",
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"OP_GEI",
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"OP_LTU",
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"OP_LEU",
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"OP_GTU",
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"OP_GEU",
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"OP_EQF",
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"OP_NEF",
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"OP_LTF",
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"OP_LEF",
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"OP_GTF",
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"OP_GEF",
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//-------------------
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"OP_LOAD1",
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"OP_LOAD2",
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"OP_LOAD4",
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"OP_STORE1",
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"OP_STORE2",
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"OP_STORE4",
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"OP_ARG",
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"OP_BLOCK_COPY",
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//-------------------
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"OP_SEX8",
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"OP_SEX16",
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"OP_NEGI",
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"OP_ADD",
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"OP_SUB",
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"OP_DIVI",
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"OP_DIVU",
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"OP_MODI",
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"OP_MODU",
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"OP_MULI",
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"OP_MULU",
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"OP_BAND",
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"OP_BOR",
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"OP_BXOR",
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"OP_BCOM",
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"OP_LSH",
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"OP_RSHI",
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"OP_RSHU",
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"OP_NEGF",
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"OP_ADDF",
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"OP_SUBF",
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"OP_DIVF",
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"OP_MULF",
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"OP_CVIF",
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"OP_CVFI"
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};
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#endif
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#if idppc
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//FIXME: these, um... look the same to me
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#if defined(__GNUC__)
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static ID_INLINE unsigned int loadWord(void *addr) {
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unsigned int word;
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asm("lwbrx %0,0,%1" : "=r" (word) : "r" (addr));
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return word;
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}
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#else
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static ID_INLINE unsigned int __lwbrx(register void *addr,
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register int offset) {
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register unsigned int word;
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asm("lwbrx %0,%2,%1" : "=r" (word) : "r" (addr), "b" (offset));
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return word;
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}
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#define loadWord(addr) __lwbrx(addr,0)
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#endif
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#else
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static ID_INLINE int loadWord(void *addr) {
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int word;
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memcpy(&word, addr, 4);
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return LittleLong(word);
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}
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#endif
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char *VM_Indent( vm_t *vm ) {
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static char *string = " ";
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if ( vm->callLevel > 20 ) {
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return string;
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}
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return string + 2 * ( 20 - vm->callLevel );
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}
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void VM_StackTrace( vm_t *vm, int programCounter, int programStack ) {
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int count;
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count = 0;
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do {
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Com_Printf( "%s\n", VM_ValueToSymbol( vm, programCounter ) );
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programStack = *(int *)&vm->dataBase[programStack+4];
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programCounter = *(int *)&vm->dataBase[programStack];
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} while ( programCounter != -1 && ++count < 32 );
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}
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/*
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====================
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VM_PrepareInterpreter
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====================
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*/
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void VM_PrepareInterpreter( vm_t *vm, vmHeader_t *header ) {
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int op;
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int pc;
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byte *code;
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int instruction;
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int *codeBase;
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vm->codeBase = Hunk_Alloc( vm->codeLength*4, h_high ); // we're now int aligned
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// memcpy( vm->codeBase, (byte *)header + header->codeOffset, vm->codeLength );
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// we don't need to translate the instructions, but we still need
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// to find each instructions starting point for jumps
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pc = 0;
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instruction = 0;
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code = (byte *)header + header->codeOffset;
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codeBase = (int *)vm->codeBase;
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while ( instruction < header->instructionCount ) {
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vm->instructionPointers[ instruction ] = pc;
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instruction++;
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op = code[ pc ];
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codeBase[pc] = op;
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if ( pc > header->codeLength ) {
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Com_Error( ERR_FATAL, "VM_PrepareInterpreter: pc > header->codeLength" );
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}
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pc++;
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// these are the only opcodes that aren't a single byte
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switch ( op ) {
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case OP_ENTER:
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case OP_CONST:
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case OP_LOCAL:
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case OP_LEAVE:
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case OP_EQ:
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case OP_NE:
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case OP_LTI:
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case OP_LEI:
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case OP_GTI:
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case OP_GEI:
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case OP_LTU:
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case OP_LEU:
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case OP_GTU:
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case OP_GEU:
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case OP_EQF:
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case OP_NEF:
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case OP_LTF:
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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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case OP_BLOCK_COPY:
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codeBase[pc+0] = loadWord(&code[pc]);
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pc += 4;
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break;
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case OP_ARG:
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codeBase[pc+0] = code[pc];
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pc += 1;
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break;
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default:
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break;
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}
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}
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pc = 0;
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instruction = 0;
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code = (byte *)header + header->codeOffset;
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codeBase = (int *)vm->codeBase;
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while ( instruction < header->instructionCount ) {
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op = code[ pc ];
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instruction++;
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pc++;
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switch ( op ) {
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case OP_ENTER:
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case OP_CONST:
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case OP_LOCAL:
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case OP_LEAVE:
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case OP_EQ:
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case OP_NE:
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case OP_LTI:
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case OP_LEI:
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case OP_GTI:
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case OP_GEI:
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case OP_LTU:
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case OP_LEU:
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case OP_GTU:
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case OP_GEU:
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case OP_EQF:
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case OP_NEF:
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case OP_LTF:
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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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case OP_BLOCK_COPY:
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switch(op) {
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case OP_EQ:
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case OP_NE:
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case OP_LTI:
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case OP_LEI:
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case OP_GTI:
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case OP_GEI:
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case OP_LTU:
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case OP_LEU:
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case OP_GTU:
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case OP_GEU:
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case OP_EQF:
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case OP_NEF:
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case OP_LTF:
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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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codeBase[pc] = vm->instructionPointers[codeBase[pc]];
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break;
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default:
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break;
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}
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pc += 4;
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break;
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case OP_ARG:
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pc += 1;
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break;
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default:
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break;
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}
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}
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}
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/*
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==============
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VM_Call
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Upon a system call, the stack will look like:
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sp+32 parm1
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sp+28 parm0
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sp+24 return stack
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sp+20 return address
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sp+16 local1
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sp+14 local0
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sp+12 arg1
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sp+8 arg0
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sp+4 return stack
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sp return address
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An interpreted function will immediately execute
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an OP_ENTER instruction, which will subtract space for
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locals from sp
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==============
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*/
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#define MAX_STACK 256
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#define STACK_MASK (MAX_STACK-1)
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#define DEBUGSTR va("%s%i", VM_Indent(vm), opStack-stack )
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int VM_CallInterpreted( vm_t *vm, int *args ) {
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int stack[MAX_STACK];
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int *opStack;
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int programCounter;
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int programStack;
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int stackOnEntry;
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byte *image;
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int *codeImage;
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int v1;
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int dataMask;
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#ifdef DEBUG_VM
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vmSymbol_t *profileSymbol;
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#endif
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// interpret the code
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vm->currentlyInterpreting = qtrue;
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// we might be called recursively, so this might not be the very top
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programStack = stackOnEntry = vm->programStack;
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#ifdef DEBUG_VM
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profileSymbol = VM_ValueToFunctionSymbol( vm, 0 );
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// uncomment this for debugging breakpoints
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vm->breakFunction = 0;
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#endif
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// set up the stack frame
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image = vm->dataBase;
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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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*(int *)&image[ programStack + 44] = args[9];
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*(int *)&image[ programStack + 40] = args[8];
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*(int *)&image[ programStack + 36] = args[7];
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*(int *)&image[ programStack + 32] = args[6];
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*(int *)&image[ programStack + 28] = args[5];
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*(int *)&image[ programStack + 24] = args[4];
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*(int *)&image[ programStack + 20] = args[3];
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*(int *)&image[ programStack + 16] = args[2];
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*(int *)&image[ programStack + 12] = args[1];
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*(int *)&image[ programStack + 8 ] = args[0];
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*(int *)&image[ programStack + 4 ] = 0; // return stack
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*(int *)&image[ programStack ] = -1; // will terminate the loop on return
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VM_Debug(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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#define r2 codeImage[programCounter]
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while ( 1 ) {
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int opcode, r0, r1;
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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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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+MAX_STACK ) {
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Com_Error( ERR_DROP, "VM opStack overflow" );
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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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}
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if ( programStack & 3 ) {
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Com_Error( ERR_DROP, "VM program stack misaligned" );
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}
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if ( vm_debugLevel > 1 ) {
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Com_Printf( "%s %s\n", DEBUGSTR, opnames[opcode] );
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}
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profileSymbol->profileCount++;
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#endif
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opcode = codeImage[ programCounter++ ];
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switch ( opcode ) {
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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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#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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r1 = r0;
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r0 = *opStack = r2;
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programCounter += 4;
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goto nextInstruction2;
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case OP_LOCAL:
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opStack++;
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r1 = r0;
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r0 = *opStack = r2+programStack;
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programCounter += 4;
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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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Com_Error( ERR_DROP, "OP_LOAD4 misaligned" );
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}
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#endif
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r0 = *opStack = *(int *)&image[ r0&dataMask ];
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goto nextInstruction2;
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case OP_LOAD2:
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r0 = *opStack = *(unsigned short *)&image[ r0&dataMask ];
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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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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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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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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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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 ] = r0;
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opStack--;
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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 += 4;
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opStack -= 2;
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}
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goto nextInstruction;
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case OP_CALL:
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// save current program counter
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*(int *)&image[ programStack ] = programCounter;
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|
|
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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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if ( programCounter < 0 ) {
|
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// system call
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|
int r;
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|
// int temp;
|
|
#ifdef DEBUG_VM
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|
int stomped;
|
|
|
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if ( vm_debugLevel ) {
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Com_Printf( "%s---> systemcall(%i)\n", DEBUGSTR, -1 - programCounter );
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}
|
|
#endif
|
|
// save the stack to allow recursive VM entry
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// temp = vm->callLevel;
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vm->programStack = programStack - 4;
|
|
#ifdef DEBUG_VM
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stomped = *(int *)&image[ programStack + 4 ];
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#endif
|
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*(int *)&image[ programStack + 4 ] = -1 - programCounter;
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|
|
|
//VM_LogSyscalls( (int *)&image[ programStack + 4 ] );
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{
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|
intptr_t* argptr = (intptr_t *)&image[ programStack + 4 ];
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#if __WORDSIZE == 64
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|
// the vm has ints on the stack, we expect
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|
// longs so we have to convert it
|
|
intptr_t argarr[16];
|
|
int i;
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|
for (i = 0; i < 16; ++i) {
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|
argarr[i] = *(int*)&image[ programStack + 4 + 4*i ];
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|
}
|
|
argptr = argarr;
|
|
#endif
|
|
r = vm->systemCall( argptr );
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|
}
|
|
|
|
#ifdef DEBUG_VM
|
|
// this is just our stack frame pointer, only needed
|
|
// for debugging
|
|
*(int *)&image[ programStack + 4 ] = stomped;
|
|
#endif
|
|
|
|
// save return value
|
|
opStack++;
|
|
*opStack = r;
|
|
programCounter = *(int *)&image[ programStack ];
|
|
// vm->callLevel = temp;
|
|
#ifdef DEBUG_VM
|
|
if ( vm_debugLevel ) {
|
|
Com_Printf( "%s<--- %s\n", DEBUGSTR, VM_ValueToSymbol( vm, programCounter ) );
|
|
}
|
|
#endif
|
|
} else if ( (unsigned)programCounter >= vm->codeLength ) {
|
|
Com_Error( ERR_DROP, "VM program counter out of range in OP_CALL" );
|
|
} else {
|
|
programCounter = vm->instructionPointers[ programCounter ];
|
|
}
|
|
goto nextInstruction;
|
|
|
|
// push and pop are only needed for discarded or bad function return values
|
|
case OP_PUSH:
|
|
opStack++;
|
|
goto nextInstruction;
|
|
case OP_POP:
|
|
opStack--;
|
|
goto nextInstruction;
|
|
|
|
case OP_ENTER:
|
|
#ifdef DEBUG_VM
|
|
profileSymbol = VM_ValueToFunctionSymbol( vm, programCounter );
|
|
#endif
|
|
// get size of stack frame
|
|
v1 = r2;
|
|
|
|
programCounter += 4;
|
|
programStack -= v1;
|
|
#ifdef DEBUG_VM
|
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// save old stack frame for debugging traces
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*(int *)&image[programStack+4] = programStack + v1;
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if ( vm_debugLevel ) {
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Com_Printf( "%s---> %s\n", DEBUGSTR, VM_ValueToSymbol( vm, programCounter - 5 ) );
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if ( vm->breakFunction && programCounter - 5 == vm->breakFunction ) {
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// this is to allow setting breakpoints here in the debugger
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vm->breakCount++;
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// vm_debugLevel = 2;
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// VM_StackTrace( vm, programCounter, programStack );
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}
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// vm->callLevel++;
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}
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#endif
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goto nextInstruction;
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case OP_LEAVE:
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// remove our stack frame
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v1 = r2;
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programStack += v1;
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// grab the saved program counter
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programCounter = *(int *)&image[ programStack ];
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#ifdef DEBUG_VM
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profileSymbol = VM_ValueToFunctionSymbol( vm, programCounter );
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if ( vm_debugLevel ) {
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// vm->callLevel--;
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Com_Printf( "%s<--- %s\n", DEBUGSTR, VM_ValueToSymbol( vm, programCounter ) );
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}
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#endif
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// check for leaving the VM
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if ( programCounter == -1 ) {
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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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}
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goto nextInstruction;
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/*
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===================================================================
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BRANCHES
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===================================================================
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*/
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case OP_JUMP:
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programCounter = r0;
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programCounter = vm->instructionPointers[ programCounter ];
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opStack--;
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goto nextInstruction;
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case OP_EQ:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_NE:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_LTI:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_LEI:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_GTI:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_GEI:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_LTU:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_LEU:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_GTU:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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}
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case OP_GEU:
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opStack -= 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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} else {
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programCounter += 4;
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goto nextInstruction;
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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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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 += 4;
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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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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 += 4;
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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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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 += 4;
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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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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 += 4;
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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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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 += 4;
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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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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 += 4;
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opStack -= 2;
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goto nextInstruction;
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}
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//===================================================================
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case OP_NEGI:
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*opStack = -r0;
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goto nextInstruction;
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case OP_ADD:
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opStack[-1] = r1 + r0;
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opStack--;
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goto nextInstruction;
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case OP_SUB:
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opStack[-1] = r1 - r0;
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opStack--;
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goto nextInstruction;
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case OP_DIVI:
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opStack[-1] = r1 / r0;
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opStack--;
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goto nextInstruction;
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case OP_DIVU:
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opStack[-1] = ((unsigned)r1) / ((unsigned)r0);
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opStack--;
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goto nextInstruction;
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case OP_MODI:
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opStack[-1] = r1 % r0;
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opStack--;
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goto nextInstruction;
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case OP_MODU:
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opStack[-1] = ((unsigned)r1) % (unsigned)r0;
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opStack--;
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goto nextInstruction;
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case OP_MULI:
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opStack[-1] = r1 * r0;
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opStack--;
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goto nextInstruction;
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case OP_MULU:
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opStack[-1] = ((unsigned)r1) * ((unsigned)r0);
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opStack--;
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goto nextInstruction;
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case OP_BAND:
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opStack[-1] = ((unsigned)r1) & ((unsigned)r0);
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opStack--;
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goto nextInstruction;
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case OP_BOR:
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opStack[-1] = ((unsigned)r1) | ((unsigned)r0);
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opStack--;
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goto nextInstruction;
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case OP_BXOR:
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opStack[-1] = ((unsigned)r1) ^ ((unsigned)r0);
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opStack--;
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goto nextInstruction;
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case OP_BCOM:
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*opStack = ~ ((unsigned)r0);
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goto nextInstruction;
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case OP_LSH:
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opStack[-1] = r1 << r0;
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opStack--;
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goto nextInstruction;
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case OP_RSHI:
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opStack[-1] = r1 >> r0;
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opStack--;
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goto nextInstruction;
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case OP_RSHU:
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opStack[-1] = ((unsigned)r1) >> r0;
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opStack--;
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goto nextInstruction;
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case OP_NEGF:
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*(float *)opStack = -*(float *)opStack;
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goto nextInstruction;
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case OP_ADDF:
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*(float *)(opStack-1) = *(float *)(opStack-1) + *(float *)opStack;
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opStack--;
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goto nextInstruction;
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case OP_SUBF:
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*(float *)(opStack-1) = *(float *)(opStack-1) - *(float *)opStack;
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opStack--;
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goto nextInstruction;
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case OP_DIVF:
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*(float *)(opStack-1) = *(float *)(opStack-1) / *(float *)opStack;
|
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opStack--;
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goto nextInstruction;
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case OP_MULF:
|
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*(float *)(opStack-1) = *(float *)(opStack-1) * *(float *)opStack;
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opStack--;
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goto nextInstruction;
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|
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case OP_CVIF:
|
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*(float *)opStack = (float)*opStack;
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goto nextInstruction;
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case OP_CVFI:
|
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*opStack = (int) *(float *)opStack;
|
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goto nextInstruction;
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case OP_SEX8:
|
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*opStack = (signed char)*opStack;
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goto nextInstruction;
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case OP_SEX16:
|
|
*opStack = (short)*opStack;
|
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goto nextInstruction;
|
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}
|
|
}
|
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|
|
done:
|
|
vm->currentlyInterpreting = qfalse;
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|
|
if ( opStack != &stack[1] ) {
|
|
Com_Error( ERR_DROP, "Interpreter error: opStack = %ld", (long int) (opStack - stack) );
|
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}
|
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|
|
vm->programStack = stackOnEntry;
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|
|
// return the result
|
|
return *opStack;
|
|
}
|