draft work on memory allocation

This commit is contained in:
georgemoralis 2023-05-17 19:29:05 +03:00
parent 81ca77a464
commit 5f0b15e2fa
3 changed files with 62 additions and 1 deletions

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

50
src/Core/Memory.cpp Normal file
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@ -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;
}
}
}

11
src/Core/Memory.h Normal file
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@ -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);
}
}