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-rw-r--r--code/qcommon/vm_x86_64.c254
1 files changed, 10 insertions, 244 deletions
diff --git a/code/qcommon/vm_x86_64.c b/code/qcommon/vm_x86_64.c
index e5ef455..eb83cc6 100644
--- a/code/qcommon/vm_x86_64.c
+++ b/code/qcommon/vm_x86_64.c
@@ -35,7 +35,6 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#include <unistd.h>
#include <stdarg.h>
-//#define USE_GAS
//#define DEBUG_VM
#ifdef DEBUG_VM
@@ -47,16 +46,10 @@ static FILE* qdasmout;
#define VM_X86_64_MMAP
-#ifndef USE_GAS
void assembler_set_output(char* buf);
size_t assembler_get_code_size(void);
void assembler_init(int pass);
void assemble_line(const char* input, size_t len);
-#ifdef Dfprintf
-#undef Dfprintf
-#define Dfprintf(args...)
-#endif
-#endif // USE_GAS
static void VM_Destroy_Compiled(vm_t* self);
@@ -225,10 +218,6 @@ static unsigned char op_argsize[256] =
[OP_BLOCK_COPY] = 4,
};
-#ifdef USE_GAS
-#define emit(x...) \
- do { fprintf(fh_s, ##x); fputc('\n', fh_s); } while(0)
-#else
void emit(const char* fmt, ...)
{
va_list ap;
@@ -238,16 +227,10 @@ void emit(const char* fmt, ...)
va_end(ap);
assemble_line(line, strlen(line));
}
-#endif // USE_GAS
-#ifdef USE_GAS
-#define JMPIARG \
- emit("jmp i_%08x", iarg);
-#else
#define JMPIARG \
emit("movq $%lu, %%rax", vm->codeBase+vm->instructionPointers[iarg]); \
emit("jmpq *%%rax");
-#endif
// integer compare and jump
#define IJ(op) \
@@ -335,102 +318,8 @@ void emit(const char* fmt, ...)
static void* getentrypoint(vm_t* vm)
{
-#ifdef USE_GAS
- return vm->codeBase+64; // skip ELF header
-#else
return vm->codeBase;
-#endif // USE_GAS
-}
-
-#ifdef USE_GAS
-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)
-{
- unsigned char* mem;
- size_t size = -1;
- 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 = (unsigned char*)mmapfile(out, &size);
- if(!mem)
- {
- Com_Printf(S_COLOR_RED "can't mmap object file %s: %s\n", out, strerror(errno));
- return -1;
- }
-
- *compiledcode = mem;
-
- return size;
}
-#endif // USE_GAS
static void block_copy_vm(unsigned dest, unsigned src, unsigned count)
{
@@ -461,68 +350,10 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
unsigned char barg = 0;
int neednilabel = 0;
struct timeval tvstart = {0, 0};
-
-#ifdef USE_GAS
- byte* compiledcode;
- int compiledsize;
- 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;
-
- gettimeofday(&tvstart, NULL);
-
- Com_Printf("compiling %s\n", vm->name);
-
-#ifdef DEBUG_VM
- snprintf(fn_s, sizeof(fn_s), "%.63s.s", vm->name);
- snprintf(fn_o, sizeof(fn_o), "%.63s.o", vm->name);
- fd_s = open(fn_s, O_CREAT|O_WRONLY|O_TRUNC, 0644);
- fd_o = open(fn_o, O_CREAT|O_WRONLY|O_TRUNC, 0644);
-#else
- 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);
-#endif
- 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 file %s 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;
- }
-
- emit("start:");
- emit("or %%r8, %%r8"); // check whether to set up instruction pointers
- emit("jnz main");
- emit("jmp setupinstructionpointers");
-
- emit("main:");
-#else // USE_GAS
int pass;
size_t compiledOfs = 0;
@@ -543,7 +374,12 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
assembler_init(pass);
-#endif // USE_GAS
+#ifdef DEBUG_VM
+ strcpy(fn_d,vm->name);
+ strcat(fn_d, ".qdasm");
+
+ qdasmout = fopen(fn_d, "w");
+#endif
// translate all instructions
pc = 0;
@@ -554,12 +390,10 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
op = code[ pc ];
++pc;
-#ifndef USE_GAS
vm->instructionPointers[instruction] = assembler_get_code_size();
-#endif
/* store current instruction number in r15 for debugging */
-#if 1
+#if DEBUG_VM
emit("nop");
emit("movq $%d, %%r15", instruction);
emit("nop");
@@ -581,15 +415,11 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
Dfprintf(qdasmout, "%s\n", opnames[op]);
}
-#ifdef USE_GAS
- emit("i_%08x:", instruction);
-#else
if(neednilabel)
{
emit("i_%08x:", instruction);
neednilabel = 0;
}
-#endif
switch ( op )
{
@@ -946,82 +776,20 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
}
}
-#ifdef USE_GAS
- 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("ret");
-
- emit("debugger:");
- if(1);
- {
- int i = 6;
- while(i--)
- {
- emit("nop");
- emit("int3");
- }
- }
-
- fflush(fh_s);
- fclose(fh_s);
+ } // pass loop
- 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;
-
-#else // USE_GAS
- }
assembler_init(0);
if(mprotect(vm->codeBase, compiledOfs, PROT_READ|PROT_EXEC))
Com_Error(ERR_DROP, "VM_CompileX86: mprotect failed");
-#endif // USE_GAS
vm->destroy = VM_Destroy_Compiled;
-
-#ifdef USE_GAS
- 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 %0,%%r10 \r\n" \
- " callq *%%r10 \r\n" \
- :
- : "m" (entryPoint)
- : "%r8", "%r10", "%rax"
- );
#ifdef DEBUG_VM
fflush(qdasmout);
fclose(qdasmout);
#endif
-
-out:
- close(fd_o);
-
-#ifndef DEBUG_VM
- if(!com_developer->integer)
- {
- unlink(fn_o);
- unlink(fn_s);
- }
-#endif
-#endif // USE_GAS
-
+
if(vm->compiled)
{
struct timeval tvdone = {0, 0};
@@ -1037,9 +805,7 @@ out:
void VM_Destroy_Compiled(vm_t* self)
{
-#ifdef USE_GAS
- munmap(self->codeBase, self->codeLength);
-#elif _WIN32
+#ifdef _WIN32
VirtualFree(self->codeBase, 0, MEM_RELEASE);
#else
munmap(self->codeBase, self->codeLength);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 19:11:57 +0000