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executable memory allocation changes

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This commit is contained in:
Toad King 2014-08-06 21:06:49 -04:00
parent aa0b4964ed
commit 9f24203ef8
1 changed files with 17 additions and 6 deletions
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23
Common/MemoryUtil.cpp
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@ -105,7 +105,7 @@ void* AllocateExecutableMemory(size_t size, bool exec)
#if defined(_WIN32)
void* ptr;
#if defined(_M_X64)
if (exec && (uintptr_t) &hint_location >= 0x100000000ULL)
if (exec && (uintptr_t) &hint_location > 0xFFFFFFFFULL)
{
if (!last_addr)
GetSystemInfo(&sys_info);
@ -132,14 +132,21 @@ void* AllocateExecutableMemory(size_t size, bool exec)
void* ptr = (void*)g_next_ptr;
g_next_ptr += size;
#else
char *map_hint = 0;
static char *map_hint = 0;
#if defined(_M_X64)
// Try to request one that is close to our memory location if we're in high memory.
// We use a dummy global variable to give us a good location to start from.
if (exec && (!map_hint) && (uintptr_t) &hint_location >= 0x100000000ULL)
map_hint = (char*)round_page(&hint_location) - 0x20000000; // 0.5gb lower than our approximate location
else if (exec && map_hint)
map_hint -= round_page(size); /* round down to the next page */
if (exec && (!map_hint))
{
if ((uintptr_t) &hint_location > 0xFFFFFFFFULL)
map_hint = (char*)round_page(&hint_location) - 0x20000000; // 0.5gb lower than our approximate location
else
map_hint = (char*)0x20000000; // 0.5GB mark in memory
}
else if (exec && (uintptr_t) map_hint > 0xFFFFFFFFULL)
{
map_hint -= round_page(size); /* round down to the next page if we're in high memory */
}
#endif
void* ptr = mmap(map_hint, size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_ANON | MAP_PRIVATE
@ -163,6 +170,10 @@ void* AllocateExecutableMemory(size_t size, bool exec)
#endif
PanicAlert("Failed to allocate executable memory");
}
else if (exec && (uintptr_t) map_hint <= 0xFFFFFFFF)
{
map_hint += round_page(size); /* round up if we're below 32-bit mark, probably allocating sequentially */
}
return ptr;
}