Add mmap implementations for virtual allocation. (#38)

UnleashedRecomp/cpu/code_cache.cpp

@@ -4,13 +4,22 @@
 
 CodeCache::CodeCache()
 {
+#ifdef _WIN32
     bucket = (char*)VirtualAlloc(nullptr, 0x200000000, MEM_RESERVE, PAGE_READWRITE);
-    assert(bucket);
+    assert(bucket != nullptr);
+#else
+    bucket = (char*)mmap(NULL, 0x200000000, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
+    assert(bucket != (char *)MAP_FAILED)
+#endif
 }
 
 CodeCache::~CodeCache()
 {
+#ifdef _WIN32
     VirtualFree(bucket, 0, MEM_RELEASE);
+#else
+    munmap(bucket, 0x200000000);
+#endif
 }
 
 void CodeCache::Init()
@@ -19,7 +28,9 @@ void CodeCache::Init()
     {
         if (PPCFuncMappings[i].host != nullptr)
         {
+#ifdef _WIN32
             VirtualAlloc(bucket + PPCFuncMappings[i].guest * 2, sizeof(void*), MEM_COMMIT, PAGE_READWRITE);
+#endif
             *(void**)(bucket + PPCFuncMappings[i].guest * 2) = (void*)PPCFuncMappings[i].host;
         }
     }
@@ -27,7 +38,9 @@ void CodeCache::Init()
 
 void CodeCache::Insert(uint32_t guest, const void* host)
 {
+#ifdef _WIN32
     VirtualAlloc(bucket + static_cast<uint64_t>(guest) * 2, sizeof(void*), MEM_COMMIT, PAGE_READWRITE);
+#endif
     *reinterpret_cast<const void**>(bucket + static_cast<uint64_t>(guest) * 2) = host;
 }
 

UnleashedRecomp/kernel/memory.cpp

@@ -3,25 +3,44 @@
 
 Memory::Memory(void* address, size_t size) : size(size)
 {
+#ifdef _WIN32
     base = (char*)VirtualAlloc(address, size, MEM_RESERVE, PAGE_READWRITE);
 
     if (base == nullptr)
         base = (char*)VirtualAlloc(nullptr, size, MEM_RESERVE, PAGE_READWRITE);
+#else
+    base = (char*)mmap(address, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
+
+    if (base == (char*)MAP_FAILED)
+        base = (char*)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
+#endif
 }
 
 void* Memory::Alloc(size_t offset, size_t size, uint32_t type)
 {
+#ifdef _WIN32
     return VirtualAlloc(base + offset, size, type, PAGE_READWRITE);
+#else
+    return base + offset;
+#endif
 }
 
 void* Memory::Commit(size_t offset, size_t size)
 {
+#ifdef _WIN32
     return Alloc(offset, size, MEM_COMMIT);
+#else
+    return base + offset;
+#endif
 }
 
 void* Memory::Reserve(size_t offset, size_t size)
 {
+#ifdef _WIN32
     return Alloc(offset, size, MEM_RESERVE);
+#else
+    return base + offset;
+#endif
 }
 
 void* MmGetHostAddress(uint32_t ptr)

UnleashedRecomp/stdafx.h

@@ -49,3 +49,7 @@ using Microsoft::WRL::ComPtr;
 
 #include "framework.h"
 #include "mutex.h"
+
+#ifndef _WIN32
+#include <sys/mman.h>
+#endif