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Define the bounds of the branch allocator memory space for 32-bit apps. 

llvm-svn: 148303
This commit is contained in:
Alexander Potapenko 2012-01-17 09:38:54 +00:00
parent 85d26f9807
commit 2b2e0721d7
1 changed files with 14 additions and 5 deletions
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19
compiler-rt/lib/asan/asan_mac.cc
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@ -178,21 +178,30 @@ void AsanLock::Unlock() {
// islands.
// TODO(glider): instead of mapping a fixed range we must find a range of
// unmapped pages in vmmap and take them.
// These constants were chosen empirically and may not work if the shadow
// memory layout changes. Unfortunately they do necessarily depend on
// kHighMemBeg or kHighMemEnd.
#if __WORDSIZE == 32
#define kIslandEnd (0xffdf0000 - kPageSize)
#define kIslandBeg (kIslandEnd - 256 * kPageSize)
#else
#define kIslandEnd (0x7fffffdf0000 - kPageSize)
#define kIslandBeg (kIslandEnd - 256 * kPageSize)
#endif
extern "C"
mach_error_t __asan_allocate_island(void **ptr,
size_t unused_size,
void *unused_hint) {
if (!island_allocator_pos) {
if ((void*)-1 == asan_mmap((void*)kIslandBeg, kIslandEnd - kIslandBeg,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANON | MAP_FIXED,
-1, 0)) {
island_allocator_pos =
asan_mmap((void*)kIslandBeg, kIslandEnd - kIslandBeg,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANON | MAP_FIXED,
-1, 0);
if (island_allocator_pos != (void*)kIslandBeg) {
return KERN_NO_SPACE;
}
island_allocator_pos = (void*)kIslandBeg;
};
*ptr = island_allocator_pos;
island_allocator_pos = (char*)island_allocator_pos + kPageSize;