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#include "virtual_asm.h"
#include <sys/mman.h>
#include <unistd.h>
#include <pthread.h>
//OSX has MAP_ANON
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
namespace assembler {
unsigned Processor::maxIntArgs64() {
return 6;
}
unsigned Processor::maxFloatArgs64() {
return 8;
}
bool Processor::isIntArg64Register(unsigned char number, unsigned char arg) {
return number < 6;
}
bool Processor::isFloatArg64Register(unsigned char number, unsigned char arg) {
return number < 8;
}
Register Processor::intArg64(unsigned char number, unsigned char arg) {
switch(number) {
case 0:
return Register(*this, EDI);
case 1:
return Register(*this, ESI);
case 2:
return Register(*this, EDX);
case 3:
return Register(*this, ECX);
case 4:
return Register(*this, R8);
case 5:
return Register(*this, R9);
default:
throw "Integer64 argument index out of bounds";
}
}
Register Processor::floatArg64(unsigned char number, unsigned char arg) {
switch(number) {
case 0:
return Register(*this, XMM0);
case 1:
return Register(*this, XMM1);
case 2:
return Register(*this, XMM2);
case 3:
return Register(*this, XMM3);
case 4:
return Register(*this, XMM4);
case 5:
return Register(*this, XMM5);
case 6:
return Register(*this, XMM6);
case 7:
return Register(*this, XMM7);
default:
throw "Float64 argument index out of bounds";
}
}
Register Processor::intArg64(unsigned char number, unsigned char arg, Register defaultReg) {
if(isIntArg64Register(number, arg))
return intArg64(number, arg);
return defaultReg;
}
Register Processor::floatArg64(unsigned char number, unsigned char arg, Register defaultReg) {
if(isFloatArg64Register(number, arg))
return floatArg64(number, arg);
return defaultReg;
}
Register Processor::intReturn64() {
return Register(*this, EAX);
}
Register Processor::floatReturn64() {
return Register(*this, XMM0);
}
CodePage::CodePage(unsigned int Size, void* requestedStart) : used(0), final(false), references(1) {
unsigned minPageSize = getMinimumPageSize();
unsigned pages = Size / minPageSize;
if(Size % minPageSize != 0)
pages += 1;
size_t reqptr = (size_t)requestedStart;
if(reqptr % minPageSize != 0)
reqptr -= (reqptr % minPageSize);
page = mmap(
(void*)reqptr,
Size,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_ANONYMOUS | MAP_PRIVATE,
0,
0);
size = pages * minPageSize;
}
void CodePage::grab() {
++references;
}
void CodePage::drop() {
if(--references == 0)
delete this;
}
CodePage::~CodePage() {
munmap(page, size);
}
void CodePage::finalize() {
mprotect(page, size, PROT_READ | PROT_EXEC);
final = true;
}
unsigned int CodePage::getMinimumPageSize() {
return getpagesize();
}
void CriticalSection::enter() {
pthread_mutex_lock((pthread_mutex_t*)pLock);
}
void CriticalSection::leave() {
pthread_mutex_unlock((pthread_mutex_t*)pLock);
}
CriticalSection::CriticalSection() {
pthread_mutex_t* mutex = new pthread_mutex_t();
pthread_mutex_init(mutex, 0);
pLock = mutex;
}
CriticalSection::~CriticalSection() {
pthread_mutex_t* mutex = (pthread_mutex_t*)pLock;
pthread_mutex_destroy(mutex);
delete mutex;
}
};
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