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v8: reapply floating patches

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Ben Noordhuis 2013-07-03 04:23:36 +02:00 committed by Trevor Norris
parent dfb1191f22
commit e3bb6e11c3
1 changed files with 16 additions and 1 deletions
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17
deps/v8/src/platform-posix.cc vendored
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@ -123,11 +123,26 @@ void* OS::GetRandomMmapAddr() {
raw_addr &= V8_UINT64_C(0x3ffffffff000); raw_addr &= V8_UINT64_C(0x3ffffffff000);
#else #else
uint32_t raw_addr = V8::RandomPrivate(isolate); uint32_t raw_addr = V8::RandomPrivate(isolate);
raw_addr &= 0x3ffff000;
# ifdef __sun
// For our Solaris/illumos mmap hint, we pick a random address in the bottom
// half of the top half of the address space (that is, the third quarter).
// Because we do not MAP_FIXED, this will be treated only as a hint -- the
// system will not fail to mmap() because something else happens to already
// be mapped at our random address. We deliberately set the hint high enough
// to get well above the system's break (that is, the heap); Solaris and
// illumos will try the hint and if that fails allocate as if there were
// no hint at all. The high hint prevents the break from getting hemmed in
// at low values, ceding half of the address space to the system heap.
raw_addr += 0x80000000;
# else
// The range 0x20000000 - 0x60000000 is relatively unpopulated across a // The range 0x20000000 - 0x60000000 is relatively unpopulated across a
// variety of ASLR modes (PAE kernel, NX compat mode, etc) and on macos // variety of ASLR modes (PAE kernel, NX compat mode, etc) and on macos
// 10.6 and 10.7. // 10.6 and 10.7.
raw_addr &= 0x3ffff000;
raw_addr += 0x20000000; raw_addr += 0x20000000;
# endif
#endif #endif
return reinterpret_cast<void*>(raw_addr); return reinterpret_cast<void*>(raw_addr);
} }