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utils::memory update

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This commit is contained in:
Nekotekina 2017-03-19 15:50:56 +03:00
parent c2cd0c994f
commit c7a9a8e8f1
2 changed files with 55 additions and 46 deletions
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64
Utilities/VirtualMemory.cpp
View File

@ -13,21 +13,49 @@
namespace utils
{
void* memory_reserve(std::size_t size)
// Convert memory protection (internal)
static auto operator +(protection prot)
{
#ifdef _WIN32
return verify("reserve_memory" HERE, ::VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS));
DWORD _prot = PAGE_NOACCESS;
switch (prot)
{
case protection::rw: _prot = PAGE_READWRITE; break;
case protection::ro: _prot = PAGE_READONLY; break;
case protection::no: break;
case protection::wx: _prot = PAGE_EXECUTE_READWRITE; break;
case protection::rx: _prot = PAGE_EXECUTE_READ; break;
}
#else
return verify("reserve_memory" HERE, ::mmap(nullptr, size, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0));
int _prot = PROT_NONE;
switch (prot)
{
case protection::rw: _prot = PROT_READ | PROT_WRITE; break;
case protection::ro: _prot = PROT_READ; break;
case protection::no: break;
case protection::wx: _prot = PROT_READ | PROT_WRITE | PROT_EXEC; break;
case protection::rx: _prot = PROT_READ | PROT_EXEC; break;
}
#endif
return _prot;
}
void* memory_reserve(std::size_t size, void* use_addr)
{
#ifdef _WIN32
return verify("reserve_memory" HERE, ::VirtualAlloc(use_addr, size, MEM_RESERVE, PAGE_NOACCESS));
#else
return verify("reserve_memory" HERE, ::mmap(use_addr, size, PROT_NONE, MAP_ANON | MAP_PRIVATE | (use_addr ? MAP_FIXED : 0), -1, 0));
#endif
}
void memory_commit(void* pointer, std::size_t size)
void memory_commit(void* pointer, std::size_t size, protection prot)
{
#ifdef _WIN32
verify(HERE), ::VirtualAlloc(pointer, size, MEM_COMMIT, PAGE_READWRITE);
verify(HERE), ::VirtualAlloc(pointer, size, MEM_COMMIT, +prot);
#else
verify(HERE), ::mprotect((void*)((u64)pointer & -4096), ::align(size, 4096), PROT_READ | PROT_WRITE) != -1;
verify(HERE), ::mprotect((void*)((u64)pointer & -4096), ::align(size, 4096), +prot) != -1;
#endif
}
@ -43,30 +71,10 @@ namespace utils
void memory_protect(void* pointer, std::size_t size, protection prot)
{
#ifdef _WIN32
DWORD _prot = PAGE_NOACCESS;
switch (prot)
{
case protection::rw: _prot = PAGE_READWRITE; break;
case protection::ro: _prot = PAGE_READONLY; break;
case protection::no: break;
case protection::wx: _prot = PAGE_EXECUTE_READWRITE; break;
case protection::rx: _prot = PAGE_EXECUTE_READ; break;
}
DWORD old;
verify(HERE), ::VirtualProtect(pointer, size, _prot, &old);
verify(HERE), ::VirtualProtect(pointer, size, +prot, &old);
#else
int _prot = PROT_NONE;
switch (prot)
{
case protection::rw: _prot = PROT_READ | PROT_WRITE; break;
case protection::ro: _prot = PROT_READ; break;
case protection::no: break;
case protection::wx: _prot = PROT_READ | PROT_WRITE | PROT_EXEC; break;
case protection::rx: _prot = PROT_READ | PROT_EXEC; break;
}
verify(HERE), ::mprotect((void*)((u64)pointer & -4096), ::align(size, 4096), _prot) != -1;
verify(HERE), ::mprotect((void*)((u64)pointer & -4096), ::align(size, 4096), +prot) != -1;
#endif
}
}

37
Utilities/VirtualMemory.h
View File

@ -2,24 +2,6 @@
namespace utils
{
/**
* Reserve `size` bytes of virtual memory and returns it.
* The memory should be commited before usage.
*/
void* memory_reserve(std::size_t size);
/**
* Commit `size` bytes of virtual memory starting at pointer.
* That is, bake reserved memory with physical memory.
* pointer should belong to a range of reserved memory.
*/
void memory_commit(void* pointer, std::size_t size);
/**
* Decommit all memory committed via commit_page_memory.
*/
void memory_decommit(void* pointer, std::size_t size);
// Memory protection type
enum class protection
{
@ -30,5 +12,24 @@ namespace utils
rx, // Read + execute
};
/**
* Reserve `size` bytes of virtual memory and returns it.
* The memory should be commited before usage.
*/
void* memory_reserve(std::size_t size, void* use_addr = nullptr);
/**
* Commit `size` bytes of virtual memory starting at pointer.
* That is, bake reserved memory with physical memory.
* pointer should belong to a range of reserved memory.
*/
void memory_commit(void* pointer, std::size_t size, protection prot = protection::rw);
/**
* Decommit all memory committed via commit_page_memory.
*/
void memory_decommit(void* pointer, std::size_t size);
// Set memory protection
void memory_protect(void* pointer, std::size_t size, protection prot);
}