draft work on memory allocation

CMakeLists.txt

@@ -26,7 +26,7 @@ add_executable(shadps4
     src/Loader/Elf.cpp
     src/Loader/Elf.h
     src/GUI/ElfViewer.cpp
-    src/GUI/ElfViewer.h "src/Util/Log.h" "src/Util/Log.cpp")
+    src/GUI/ElfViewer.h "src/Util/Log.h" "src/Util/Log.cpp" "src/Core/Memory.cpp" "src/Core/Memory.h")
 
 find_package(OpenGL REQUIRED)
 

src/Core/Memory.cpp

@@ -0,0 +1,50 @@
+#include "../Loader/Elf.h"
+#include <windows.h>
+#include "../Util/Log.h"
+
+namespace Memory
+{
+
+	static u64 get_aligned_size(const elf_program_header* phdr)
+	{
+		return (phdr->p_align != 0 ? (phdr->p_memsz + (phdr->p_align - 1)) & ~(phdr->p_align - 1) : phdr->p_memsz);
+	}
+
+	static u64 calculate_base_size(const elf_header* ehdr, const elf_program_header* phdr)
+	{
+		u64 base_size = 0;
+		for (u16 i = 0; i < ehdr->e_phnum; i++)
+		{
+			if (phdr[i].p_memsz != 0 && (phdr[i].p_type == PT_LOAD || phdr[i].p_type == PT_SCE_RELRO))
+			{
+				auto phdrh = phdr + i;
+				u64 last_addr = phdr[i].p_vaddr + get_aligned_size(phdrh);
+				if (last_addr > base_size)
+				{
+					base_size = last_addr;
+				}
+			}
+		}
+		return base_size;
+	}
+
+	namespace VirtualMemory {
+
+		u64 memory_alloc(u64 address, u64 size)
+		{
+			//TODO it supports only execute_read_write mode
+			auto ptr = reinterpret_cast<uintptr_t>(VirtualAlloc(reinterpret_cast<LPVOID>(static_cast<uintptr_t>(address)), 
+															    size,
+																static_cast<DWORD>(MEM_COMMIT) | static_cast<DWORD>(MEM_RESERVE),
+																PAGE_EXECUTE_READWRITE));
+
+			if (ptr == 0)
+			{
+				auto err = static_cast<u32>(GetLastError());
+				LOG_ERROR_IF(true,"VirtualAlloc() failed: 0x{:X}\n", err);
+			}
+			return ptr;
+		}
+	}
+
+}

src/Core/Memory.h

@@ -0,0 +1,11 @@
+#pragma once
+
+namespace Memory
+{
+	static u64 get_aligned_size(const elf_program_header* phdr);
+	static u64 calculate_base_size(const elf_header* ehdr, const elf_program_header* phdr);
+
+	namespace VirtualMemory {
+		u64 memory_alloc(u64 address, u64 size);
+	}
+}