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virtual_asm_windows.cpp
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virtual_asm_windows.cpp
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#include "virtual_asm.h"
#include <Windows.h>
namespace assembler {
unsigned Processor::maxIntArgs64() {
return 4;
}
unsigned Processor::maxFloatArgs64() {
return 4;
}
bool Processor::isIntArg64Register(unsigned char number, unsigned char arg) {
return arg < 4;
}
bool Processor::isFloatArg64Register(unsigned char number, unsigned char arg) {
return arg < 4;
}
Register Processor::intArg64(unsigned char number, unsigned char arg) {
switch(arg) {
case 0:
return Register(*this, ECX);
case 1:
return Register(*this, EDX);
case 2:
return Register(*this, R8);
case 3:
return Register(*this, R9);
default:
throw "Integer64 argument index out of bounds";
}
}
Register Processor::floatArg64(unsigned char number, unsigned char arg) {
switch(arg) {
case 0:
return Register(*this, XMM0);
case 1:
return Register(*this, XMM1);
case 2:
return Register(*this, XMM2);
case 3:
return Register(*this, XMM3);
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) {
SYSTEM_INFO info;
GetSystemInfo(&info);
unsigned minPageSize = info.dwPageSize;
size_t pageStep = (size_t)info.dwAllocationGranularity * 2;
if((size_t)Size > pageStep)
pageStep = (size_t)Size;
unsigned pages = Size / minPageSize;
if(Size % minPageSize != 0)
pages += 1;
size = (pages * minPageSize) - 2;
//Search for progressively more distant possible page locations, then just get any available one
for(int i = 1; i < 256; ++i) {
void* request = (char*)requestedStart + i*pageStep;
page = VirtualAlloc(request, size, MEM_COMMIT|MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if(page != 0)
return;
}
page = VirtualAlloc(0, size, MEM_COMMIT|MEM_RESERVE, PAGE_EXECUTE_READWRITE);
}
void CodePage::grab() {
++references;
}
void CodePage::drop() {
if(--references == 0)
delete this;
}
CodePage::~CodePage() {
VirtualFree(page,0,MEM_RELEASE);
}
void CodePage::finalize() {
FlushInstructionCache(GetCurrentProcess(),page,size);
DWORD oldProtect = PAGE_EXECUTE_READWRITE;
VirtualProtect(page,size,PAGE_EXECUTE_READ,&oldProtect);
final = true;
}
unsigned int CodePage::getMinimumPageSize() {
SYSTEM_INFO info;
GetSystemInfo(&info);
return info.dwPageSize;
}
void CriticalSection::enter() {
EnterCriticalSection((CRITICAL_SECTION*)pLock);
}
void CriticalSection::leave() {
LeaveCriticalSection((CRITICAL_SECTION*)pLock);
}
CriticalSection::CriticalSection() {
auto* section = new CRITICAL_SECTION;
InitializeCriticalSection(section);
pLock = section;
}
CriticalSection::~CriticalSection() {
DeleteCriticalSection((CRITICAL_SECTION*)pLock);
delete (CRITICAL_SECTION*)pLock;
}
};

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virtual_asm_windows.cpp (3 KB)

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