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lilium-voyager/code/qcommon/vm_x86_64.c
Ludwig Nussel 13039ef44f make memory for generated opcodes executable so the program works with 
enabled NX feature.
2006-01-06 19:11:05 +00:00

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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2005 Ludwig Nussel <ludwig.nussel@web.de>
This file is part of Quake III Arena source code.
Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
// vm_x86_64.c -- load time compiler and execution environment for x86-64
#include "vm_local.h"
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#ifdef DEBUG_VM
#define Dfprintf(fd, args...) fprintf(fd, ##args)
static FILE* qdasmout;
#else
#define Dfprintf(args...)
#endif
/*
eax scratch
ebx scratch
ecx scratch (required for shifts)
edx scratch (required for divisions)
rsi stack pointer
rdi program frame pointer
r8 pointer to begin of real stack memory
r9 return address to real program
r10 start of generated code
*/
static long callAsmCall(long callProgramStack, long callSyscallNum)
{
vm_t *savedVM;
long ret = 0x77;
long args[11];
// int iargs[11];
int i;
// Dfprintf(stderr, "callAsmCall(%ld, %ld)\n", callProgramStack, callSyscallNum);
// Com_Printf("-> callAsmCall %s, level %d, num %ld\n", currentVM->name, currentVM->callLevel, callSyscallNum);
savedVM = currentVM;
// save the stack to allow recursive VM entry
currentVM->programStack = callProgramStack - 4;
args[0] = callSyscallNum;
// iargs[0] = callSyscallNum;
for(i = 0; i < 10; ++i)
{
// iargs[i+1] = *(int *)((byte *)currentVM->dataBase + callProgramStack + 8 + 4*i);
args[i+1] = *(int *)((byte *)currentVM->dataBase + callProgramStack + 8 + 4*i);
}
ret = currentVM->systemCall(args);
currentVM = savedVM;
// Com_Printf("<- callAsmCall %s, level %d, num %ld\n", currentVM->name, currentVM->callLevel, callSyscallNum);
return ret;
}
#ifdef DEBUG_VM // bk001204
static char *opnames[256] = {
"OP_UNDEF",
"OP_IGNORE",
"OP_BREAK",
"OP_ENTER",
"OP_LEAVE",
"OP_CALL",
"OP_PUSH",
"OP_POP",
"OP_CONST",
"OP_LOCAL",
"OP_JUMP",
//-------------------
"OP_EQ",
"OP_NE",
"OP_LTI",
"OP_LEI",
"OP_GTI",
"OP_GEI",
"OP_LTU",
"OP_LEU",
"OP_GTU",
"OP_GEU",
"OP_EQF",
"OP_NEF",
"OP_LTF",
"OP_LEF",
"OP_GTF",
"OP_GEF",
//-------------------
"OP_LOAD1",
"OP_LOAD2",
"OP_LOAD4",
"OP_STORE1",
"OP_STORE2",
"OP_STORE4",
"OP_ARG",
"OP_BLOCK_COPY",
//-------------------
"OP_SEX8",
"OP_SEX16",
"OP_NEGI",
"OP_ADD",
"OP_SUB",
"OP_DIVI",
"OP_DIVU",
"OP_MODI",
"OP_MODU",
"OP_MULI",
"OP_MULU",
"OP_BAND",
"OP_BOR",
"OP_BXOR",
"OP_BCOM",
"OP_LSH",
"OP_RSHI",
"OP_RSHU",
"OP_NEGF",
"OP_ADDF",
"OP_SUBF",
"OP_DIVF",
"OP_MULF",
"OP_CVIF",
"OP_CVFI"
};
#endif // DEBUG_VM
static unsigned char op_argsize[256] =
{
[OP_ENTER] = 4,
[OP_LEAVE] = 4,
[OP_CONST] = 4,
[OP_LOCAL] = 4,
[OP_EQ] = 4,
[OP_NE] = 4,
[OP_LTI] = 4,
[OP_LEI] = 4,
[OP_GTI] = 4,
[OP_GEI] = 4,
[OP_LTU] = 4,
[OP_LEU] = 4,
[OP_GTU] = 4,
[OP_GEU] = 4,
[OP_EQF] = 4,
[OP_NEF] = 4,
[OP_LTF] = 4,
[OP_LEF] = 4,
[OP_GTF] = 4,
[OP_GEF] = 4,
[OP_ARG] = 1,
[OP_BLOCK_COPY] = 4,
};
#define emit(x...) \
do { fprintf(fh_s, ##x); fputc('\n', fh_s); } while(0)
// integer compare and jump
#define IJ(op) \
emit("subq $8, %%rsi"); \
emit("movl 4(%%rsi), %%eax"); \
emit("cmpl 8(%%rsi), %%eax"); \
emit(op " i_%08x", instruction+1); \
emit("jmp i_%08x", iarg);
#ifdef USE_X87
#define FJ(bits, op) \
emit("subq $8, %%rsi");\
emit("flds 4(%%rsi)");\
emit("fcomps 8(%%rsi)");\
emit("fnstsw %%ax");\
emit("testb $" #bits ", %%ah");\
emit(op " i_%08x", instruction+1);\
emit("jmp i_%08x", iarg);
#define XJ(x)
#else
#define FJ(x, y)
#define XJ(op) \
emit("subq $8, %%rsi");\
emit("movss 4(%%rsi), %%xmm0");\
emit("ucomiss 8(%%rsi), %%xmm0");\
emit("jp i_%08x", instruction+1);\
emit(op " i_%08x", instruction+1);\
emit("jmp i_%08x", iarg);
#endif
#define SIMPLE(op) \
emit("subq $4, %%rsi"); \
emit("movl 4(%%rsi), %%eax"); \
emit(op " %%eax, 0(%%rsi)");
#ifdef USE_X87
#define FSIMPLE(op) \
emit("subq $4, %%rsi"); \
emit("flds 0(%%rsi)"); \
emit(op " 4(%%rsi)"); \
emit("fstps 0(%%rsi)");
#define XSIMPLE(op)
#else
#define FSIMPLE(op)
#define XSIMPLE(op) \
emit("subq $4, %%rsi"); \
emit("movss 0(%%rsi), %%xmm0"); \
emit(op " 4(%%rsi), %%xmm0"); \
emit("movss %%xmm0, 0(%%rsi)");
#endif
#define SHIFT(op) \
emit("subq $4, %%rsi"); \
emit("movl 4(%%rsi), %%ecx"); \
emit("movl 0(%%rsi), %%eax"); \
emit(op " %%cl, %%eax"); \
emit("movl %%eax, 0(%%rsi)");
#if 1
#define RANGECHECK(reg) \
emit("andl $0x%x, %%" #reg, vm->dataMask);
#else
#define RANGECHECK(reg)
#endif
#ifdef DEBUG_VM
#define NOTIMPL(x) \
do { Com_Error(ERR_DROP, "instruction not implemented: %s\n", opnames[x]); } while(0)
#else
#define NOTIMPL(x) \
do { Com_Printf(S_COLOR_RED "instruction not implemented: %x\n", x); vm->compiled = qfalse; return; } while(0)
#endif
static void* getentrypoint(vm_t* vm)
{
return vm->codeBase+64; // skip ELF header
}
char* mmapfile(const char* fn, size_t* size)
{
int fd = -1;
char* mem = NULL;
struct stat stb;
fd = open(fn, O_RDONLY);
if(fd == -1)
goto out;
if(fstat(fd, &stb) == -1)
goto out;
*size = stb.st_size;
mem = mmap(NULL, stb.st_size, PROT_READ|PROT_EXEC, MAP_SHARED, fd, 0);
if(mem == (void*)-1)
mem = NULL;
out:
if(fd != -1)
close(fd);
return mem;
}
static int doas(char* in, char* out, unsigned char** compiledcode)
{
char* buf;
char* mem;
size_t size = -1, allocsize;
int ps;
pid_t pid;
Com_Printf("running assembler < %s > %s\n", in, out);
pid = fork();
if(pid == -1)
{
Com_Printf(S_COLOR_RED "can't fork\n");
return -1;
}
if(!pid)
{
char* const argv[] = {
"as",
"-o",
out,
in,
NULL
};
execvp(argv[0], argv);
_exit(-1);
}
else
{
int status;
if(waitpid(pid, &status, 0) == -1)
{
Com_Printf(S_COLOR_RED "can't wait for as: %s\n", strerror(errno));
return -1;
}
if(!WIFEXITED(status))
{
Com_Printf(S_COLOR_RED "as died\n");
return -1;
}
if(WEXITSTATUS(status))
{
Com_Printf(S_COLOR_RED "as failed with status %d\n", WEXITSTATUS(status));
return -1;
}
}
Com_Printf("done\n");
mem = mmapfile(out, &size);
if(!mem)
{
Com_Printf(S_COLOR_RED "can't mmap object file %s: %s\n", out, strerror(errno));
return -1;
}
ps = sysconf(_SC_PAGE_SIZE);
if(ps == -1)
{
Com_Printf(S_COLOR_RED "can't determine page size: %s\n", strerror(errno));
return -1;
}
--ps;
allocsize = (size+ps)&~ps;
buf = Hunk_Alloc(allocsize, h_high);
buf = (void*)(((unsigned long)buf+ps)&~ps);
memcpy(buf, mem, size);
munmap(mem, 0);
if((*compiledcode = (unsigned char*)buf))
{
// need to be able to exec code
if(mprotect(buf, allocsize, PROT_READ|PROT_WRITE|PROT_EXEC) == -1)
{
Com_Error(ERR_FATAL, "mprotect failed on %p+%x: %s\n", buf, allocsize, strerror(errno));
}
return size;
}
return -1;
}
static void 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!\n");
}
memcpy(currentVM->dataBase+dest, currentVM->dataBase+src, count);
}
/*
=================
VM_Compile
=================
*/
void VM_Compile( vm_t *vm, vmHeader_t *header ) {
unsigned char op;
int pc;
unsigned instruction;
char* code;
unsigned iarg = 0;
unsigned char barg = 0;
void* entryPoint;
char fn_s[2*MAX_QPATH]; // output file for assembler code
char fn_o[2*MAX_QPATH]; // file written by as
#ifdef DEBUG_VM
char fn_d[MAX_QPATH]; // disassembled
#endif
FILE* fh_s;
int fd_s, fd_o;
byte* compiledcode;
int compiledsize;
Com_Printf("compiling %s\n", vm->name);
snprintf(fn_s, sizeof(fn_s), "/tmp/%.63s.s_XXXXXX", vm->name);
snprintf(fn_o, sizeof(fn_o), "/tmp/%.63s.o_XXXXXX", vm->name);
fd_s = mkstemp(fn_s);
fd_o = mkstemp(fn_o);
if(fd_s == -1 || fd_o == -1)
{
if(fd_s != -1) close(fd_s);
if(fd_o != -1) close(fd_o);
unlink(fn_s);
unlink(fn_o);
Com_Printf(S_COLOR_RED "can't create temporary files for vm\n", fn_s);
vm->compiled = qfalse;
return;
}
#ifdef DEBUG_VM
strcpy(fn_d,vm->name);
strcat(fn_d, ".qdasm");
qdasmout = fopen(fn_d, "w");
#endif
fh_s = fdopen(fd_s, "wb");
if(!fh_s)
{
Com_Printf(S_COLOR_RED "can't write %s\n", fn_s);
vm->compiled = qfalse;
return;
}
// translate all instructions
pc = 0;
code = (char *)header + header->codeOffset;
emit("start:");
emit("or %%r8, %%r8"); // check whether to set up instruction pointers
emit("jnz main");
emit("jmp setupinstructionpointers");
emit("exit:");
emit("jmp *%%r9");
emit("main:");
for ( instruction = 0; instruction < header->instructionCount; ++instruction )
{
op = code[ pc ];
++pc;
vm->instructionPointers[instruction] = pc;
#if 0
emit("nop");
emit("movq $%d, %%r15", instruction);
emit("nop");
#endif
if(op_argsize[op] == 4)
{
iarg = *(int*)(code+pc);
pc += 4;
Dfprintf(qdasmout, "%s %8u\n", opnames[op], iarg);
}
else if(op_argsize[op] == 1)
{
barg = code[pc++];
Dfprintf(qdasmout, "%s %8hhu\n", opnames[op], barg);
}
else
{
Dfprintf(qdasmout, "%s\n", opnames[op]);
}
emit("i_%08x:", instruction);
switch ( op )
{
case OP_UNDEF:
NOTIMPL(op);
break;
case OP_IGNORE:
emit("nop");
break;
case OP_BREAK:
emit("int3");
break;
case OP_ENTER:
emit("subl $%d, %%edi", iarg);
RANGECHECK(edi);
break;
case OP_LEAVE:
emit("addl $%d, %%edi", iarg); // get rid of stack frame
RANGECHECK(edi);
emit("movl 0(%%r8, %%rdi, 1), %%eax"); // get return address
emit("movq $%lu, %%rbx", (unsigned long)vm->instructionPointers);
emit("cmp $-1, %%eax");
emit("je jumptoexit%d", instruction);
emit("movl (%%rbx, %%rax, 4), %%eax"); // load new relative jump address
emit("addq %%r10, %%rax");
emit("jmp *%%rax");
emit("jumptoexit%d:", instruction);
emit("jmp exit");
break;
case OP_CALL:
emit("movl 0(%%rsi), %%eax"); // get instr from stack
emit("subq $4, %%rsi");
emit("movl $%d, 0(%%r8, %%rdi, 1)", instruction+1); // save next instruction
emit("orl %%eax, %%eax");
emit("jl callSyscall%d", instruction);
emit("movq $%lu, %%rbx", (unsigned long)vm->instructionPointers);
emit("movl (%%rbx, %%rax, 4), %%eax"); // load new relative jump address
emit("addq %%r10, %%rax");
emit("jmp *%%rax");
emit("callSyscall%d:", instruction);
// emit("fnsave 4(%%rsi)");
emit("push %%rsi");
emit("push %%rdi");
emit("push %%r8");
emit("push %%r9");
emit("push %%r10");
emit("push %%r10"); // align!
emit("negl %%eax"); // convert to actual number
emit("decl %%eax");
// first argument already in rdi
emit("movq %%rax, %%rsi"); // second argument in rsi
emit("movq $%lu, %%rax", (unsigned long)callAsmCall);
emit("callq *%%rax");
emit("pop %%r10");
emit("pop %%r10");
emit("pop %%r9");
emit("pop %%r8");
emit("pop %%rdi");
emit("pop %%rsi");
// emit("frstor 4(%%rsi)");
emit("addq $4, %%rsi");
emit("movl %%eax, (%%rsi)");
break;
case OP_PUSH:
emit("addq $4, %%rsi");
break;
case OP_POP:
emit("subq $4, %%rsi");
break;
case OP_CONST:
emit("addq $4, %%rsi");
emit("movl $%d, 0(%%rsi)", iarg);
break;
case OP_LOCAL:
emit("movl %%edi, %%ebx");
emit("addl $%d,%%ebx", iarg);
emit("addq $4, %%rsi");
emit("movl %%ebx, 0(%%rsi)");
break;
case OP_JUMP:
emit("movl 0(%%rsi), %%eax"); // get instr from stack
emit("subq $4, %%rsi");
emit("movq $%lu, %%rbx", (unsigned long)vm->instructionPointers);
emit("movl (%%rbx, %%rax, 4), %%eax"); // load new relative jump address
emit("addq %%r10, %%rax");
emit("jmp *%%rax");
break;
case OP_EQ:
IJ("jne");
break;
case OP_NE:
IJ("je");
break;
case OP_LTI:
IJ("jnl");
break;
case OP_LEI:
IJ("jnle");
break;
case OP_GTI:
IJ("jng");
break;
case OP_GEI:
IJ("jnge");
break;
case OP_LTU:
IJ("jnb");
break;
case OP_LEU:
IJ("jnbe");
break;
case OP_GTU:
IJ("jna");
break;
case OP_GEU:
IJ("jnae");
break;
case OP_EQF:
FJ(0x40, "jz");
XJ("jnz");
break;
case OP_NEF:
FJ(0x40, "jnz");
#ifndef USE_X87
emit("subq $8, %%rsi");
emit("movss 4(%%rsi), %%xmm0");
emit("ucomiss 8(%%rsi), %%xmm0");
emit("jp dojump_i_%08x", instruction);
emit("jz i_%08x", instruction+1);
emit("dojump_i_%08x:", instruction);
emit("jmp i_%08x", iarg);
#endif
break;
case OP_LTF:
FJ(0x01, "jz");
XJ("jnc");
break;
case OP_LEF:
FJ(0x41, "jz");
XJ("ja");
break;
case OP_GTF:
FJ(0x41, "jnz");
XJ("jbe");
break;
case OP_GEF:
FJ(0x01, "jnz");
XJ("jb");
break;
case OP_LOAD1:
emit("movl 0(%%rsi), %%eax"); // get pointer from stack
RANGECHECK(eax);
emit("movb 0(%%r8, %%rax, 1), %%al"); // deref into eax
emit("andq $255, %%rax");
emit("movl %%eax, 0(%%rsi)"); // store on stack
break;
case OP_LOAD2:
emit("movl 0(%%rsi), %%eax"); // get pointer from stack
RANGECHECK(eax);
emit("movw 0(%%r8, %%rax, 1), %%rax"); // deref into eax
emit("movl %%eax, 0(%%rsi)"); // store on stack
break;
case OP_LOAD4:
emit("movl 0(%%rsi), %%eax"); // get pointer from stack
RANGECHECK(eax);
emit("movl 0(%%r8, %%rax, 1), %%eax"); // deref into eax
emit("movl %%eax, 0(%%rsi)"); // store on stack
break;
case OP_STORE1:
emit("movl 0(%%rsi), %%eax"); // get value from stack
emit("andq $255, %%rax");
emit("movl -4(%%rsi), %%ebx"); // get pointer from stack
RANGECHECK(ebx);
emit("movb %%al, 0(%%r8, %%rbx, 1)"); // store in memory
emit("subq $8, %%rsi");
break;
case OP_STORE2:
emit("movl 0(%%rsi), %%eax"); // get value from stack
emit("movl -4(%%rsi), %%ebx"); // get pointer from stack
RANGECHECK(ebx);
emit("movw %%rax, 0(%%r8, %%rbx, 1)"); // store in memory
emit("subq $8, %%rsi");
break;
case OP_STORE4:
emit("movl -4(%%rsi), %%ebx"); // get pointer from stack
RANGECHECK(ebx);
emit("movl 0(%%rsi), %%ecx"); // get value from stack
emit("movl %%ecx, 0(%%r8, %%rbx, 1)"); // store in memory
emit("subq $8, %%rsi");
break;
case OP_ARG:
emit("subq $4, %%rsi");
emit("movl 4(%%rsi), %%eax"); // get value from stack
emit("movl $0x%hhx, %%ebx", barg);
emit("addl %%edi, %%ebx");
RANGECHECK(ebx);
emit("movl %%eax, 0(%%r8,%%rbx, 1)"); // store in args space
break;
case OP_BLOCK_COPY:
emit("subq $8, %%rsi");
emit("push %%rsi");
emit("push %%rdi");
emit("push %%r8");
emit("push %%r9");
emit("push %%r10");
emit("movl 4(%%rsi), %%edi"); // 1st argument dest
emit("movl 8(%%rsi), %%esi"); // 2nd argument src
emit("movl $%d, %%edx", iarg); // 3rd argument count
emit("movq $%lu, %%rax", (unsigned long)block_copy_vm);
emit("callq *%%rax");
emit("pop %%r10");
emit("pop %%r9");
emit("pop %%r8");
emit("pop %%rdi");
emit("pop %%rsi");
break;
case OP_SEX8:
emit("movw 0(%%rsi), %%rax");
emit("andq $255, %%rax");
emit("cbw");
emit("cwde");
emit("movl %%eax, 0(%%rsi)");
break;
case OP_SEX16:
emit("movw 0(%%rsi), %%rax");
emit("cwde");
emit("movl %%eax, 0(%%rsi)");
break;
case OP_NEGI:
emit("negl 0(%%rsi)");
break;
case OP_ADD:
SIMPLE("addl");
break;
case OP_SUB:
SIMPLE("subl");
break;
case OP_DIVI:
emit("subq $4, %%rsi");
emit("movl 0(%%rsi), %%eax");
emit("cdq");
emit("idivl 4(%%rsi)");
emit("movl %%eax, 0(%%rsi)");
break;
case OP_DIVU:
emit("subq $4, %%rsi");
emit("movl 0(%%rsi), %%eax");
emit("xorq %%rdx, %%rdx");
emit("divl 4(%%rsi)");
emit("movl %%eax, 0(%%rsi)");
break;
case OP_MODI:
emit("subq $4, %%rsi");
emit("movl 0(%%rsi), %%eax");
emit("xorl %%edx, %%edx");
emit("divl 4(%%rsi)");
emit("movl %%edx, 0(%%rsi)");
break;
case OP_MODU:
emit("subq $4, %%rsi");
emit("movl 0(%%rsi), %%eax");
emit("xorl %%edx, %%edx");
emit("idivl 4(%%rsi)");
emit("movl %%edx, 0(%%rsi)");
break;
case OP_MULI:
emit("subq $4, %%rsi");
emit("movl 0(%%rsi), %%eax");
emit("imull 4(%%rsi)");
emit("movl %%eax, 0(%%rsi)");
break;
case OP_MULU:
emit("subq $4, %%rsi");
emit("movl 0(%%rsi), %%eax");
emit("mull 4(%%rsi)");
emit("movl %%eax, 0(%%rsi)");
break;
case OP_BAND:
SIMPLE("andl");
break;
case OP_BOR:
SIMPLE("orl");
break;
case OP_BXOR:
SIMPLE("xorl");
break;
case OP_BCOM:
emit("notl 0(%%rsi)");
break;
case OP_LSH:
SHIFT("shl");
break;
case OP_RSHI:
SHIFT("sarl");
break;
case OP_RSHU:
SHIFT("shrl");
break;
case OP_NEGF:
#ifdef USE_X87
emit("flds 0(%%rsi)");
emit("fchs");
emit("fstps 0(%%rsi)");
#else
emit("movl $0x80000000, %%eax");
emit("xorl %%eax, 0(%%rsi)");
#endif
break;
case OP_ADDF:
FSIMPLE("fadds");
XSIMPLE("addss");
break;
case OP_SUBF:
FSIMPLE("fsubs");
XSIMPLE("subss");
break;
case OP_DIVF:
FSIMPLE("fdivs");
XSIMPLE("divss");
break;
case OP_MULF:
FSIMPLE("fmuls");
XSIMPLE("mulss");
break;
case OP_CVIF:
#ifdef USE_X87
emit("filds 0(%%rsi)");
emit("fstps 0(%%rsi)");
#else
emit("movl 0(%%rsi), %%eax");
emit("cvtsi2ss %%eax, %%xmm0");
emit("movss %%xmm0, 0(%%rsi)");
#endif
break;
case OP_CVFI:
#ifdef USE_X87
emit("flds 0(%%rsi)");
emit("fnstcw 4(%%rsi)");
emit("movw $0x0F7F, 8(%%rsi)"); // round toward zero
emit("fldcw 8(%%rsi)");
emit("fistpl 0(%%rsi)");
emit("fldcw 4(%%rsi)");
#else
emit("movss 0(%%rsi), %%xmm0");
emit("cvttss2si %%xmm0, %%eax");
emit("movl %%eax, 0(%%rsi)");
#endif
break;
default:
NOTIMPL(op);
break;
}
}
emit("setupinstructionpointers:");
emit("movq $%lu, %%rax", (unsigned long)vm->instructionPointers);
for ( instruction = 0; instruction < header->instructionCount; ++instruction )
{
emit("movl $i_%08x-start, %d(%%rax)", instruction, instruction*4);
}
emit("jmp exit");
emit("debugger:");
if(1);
{
int i = 6;
while(i--)
{
emit("nop");
emit("int3");
}
}
fflush(fh_s);
fclose(fh_s);
compiledsize = doas(fn_s, fn_o, &compiledcode);
if(compiledsize == -1)
{
vm->compiled = qfalse;
goto out;
}
vm->codeBase = compiledcode; // remember to skip ELF header!
vm->codeLength = compiledsize;
entryPoint = getentrypoint(vm);
// __asm__ __volatile__ ("int3");
Com_Printf("computing jump table\n");
// call code with r8 set to zero to set up instruction pointers
__asm__ __volatile__ (
" xorq %%r8,%%r8 \r\n" \
" movq $doneinit,%%r9 \r\n" \
" movq %0,%%r10 \r\n" \
" jmp *%%r10 \r\n" \
"doneinit: \r\n" \
:
: "m" (entryPoint)
: "%r8", "%r9", "%r10", "%rax"
);
#ifdef DEBUG_VM
fflush(qdasmout);
#endif
Com_Printf( "VM file %s compiled to %i bytes of code (0x%lx - 0x%lx)\n", vm->name, vm->codeLength, vm->codeBase, vm->codeBase+vm->codeLength );
out:
close(fd_o);
if(!com_developer->integer)
{
unlink(fn_o);
unlink(fn_s);
}
}
/*
==============
VM_CallCompiled
This function is called directly by the generated code
==============
*/
#ifdef DEBUG_VM
static char* memData;
#endif
int VM_CallCompiled( vm_t *vm, int *args ) {
int programCounter;
int programStack;
int stackOnEntry;
byte *image;
void *entryPoint;
void *opStack;
int stack[1024] = { 0xDEADBEEF };
currentVM = vm;
++vm->callLevel;
// Com_Printf("entering %s level %d, call %d, arg1 = 0x%x\n", vm->name, vm->callLevel, args[0], args[1]);
// interpret the code
vm->currentlyInterpreting = qtrue;
// callMask = vm->dataMask;
// we might be called recursively, so this might not be the very top
programStack = vm->programStack;
stackOnEntry = programStack;
// set up the stack frame
image = vm->dataBase;
#ifdef DEBUG_VM
memData = (char*)image;
#endif
programCounter = 0;
programStack -= 48;
*(int *)&image[ programStack + 44] = args[9];
*(int *)&image[ programStack + 40] = args[8];
*(int *)&image[ programStack + 36] = args[7];
*(int *)&image[ programStack + 32] = args[6];
*(int *)&image[ programStack + 28] = args[5];
*(int *)&image[ programStack + 24] = args[4];
*(int *)&image[ programStack + 20] = args[3];
*(int *)&image[ programStack + 16] = args[2];
*(int *)&image[ programStack + 12] = args[1];
*(int *)&image[ programStack + 8 ] = args[0];
*(int *)&image[ programStack + 4 ] = 0x77777777; // return stack
*(int *)&image[ programStack ] = -1; // will terminate the loop on return
// off we go into generated code...
entryPoint = getentrypoint(vm);
opStack = &stack;
__asm__ __volatile__ (
" movq %5,%%rsi \r\n" \
" movl %4,%%edi \r\n" \
" movq $done,%%r9 \r\n" \
" movq %2,%%r10 \r\n" \
" movq %3,%%r8 \r\n" \
" jmp *%%r10 \r\n" \
"done: \r\n" \
" movl %%edi, %0 \r\n" \
" movq %%rsi, %1 \r\n" \
: "=m" (programStack), "=m" (opStack)
: "m" (entryPoint), "m" (vm->dataBase), "m" (programStack), "m" (opStack)
: "%rsi", "%rdi", "%rax", "%rbx", "%rcx", "%rdx", "%r8", "%r9", "%r10", "%r15", "%xmm0"
);
if ( opStack != &stack[1] ) {
Com_Error( ERR_DROP, "opStack corrupted in compiled code (offset %d)\n", (void*)&stack[1] - opStack);
}
if ( programStack != stackOnEntry - 48 ) {
Com_Error( ERR_DROP, "programStack corrupted in compiled code\n" );
}
// Com_Printf("exiting %s level %d\n", vm->name, vm->callLevel);
--vm->callLevel;
vm->programStack = stackOnEntry;
return *(int *)opStack;
}
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