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Fix compilation and JIT support on NetBSD:

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1. Disable hugepages (not supported).
2. Force W^X (required).
3. When allocating JIT memory, PROT_EXEC must be reserved
   in order to set the pages executable later.
This commit is contained in:
tevador
2020-06-28 16:16:20 +02:00
parent 7741eb1e97
commit 708a4e50c5
6 changed files with 21 additions and 11 deletions
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src/virtual_memory.cpp
+7 -2
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@@ -94,7 +94,12 @@ void* allocMemoryPages(std::size_t bytes) {
if (mem == nullptr)
throw std::runtime_error(getErrorMessage("allocMemoryPages - VirtualAlloc"));
#else
mem = mmap(nullptr, bytes, PAGE_READWRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
#if defined(__NetBSD__)
#define RESERVED_FLAGS PROT_MPROTECT(PROT_EXEC)
#else
#define RESERVED_FLAGS 0
#endif
mem = mmap(nullptr, bytes, PAGE_READWRITE | RESERVED_FLAGS, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (mem == MAP_FAILED)
throw std::runtime_error("allocMemoryPages - mmap failed");
#endif
@@ -141,7 +146,7 @@ void* allocLargePagesMemory(std::size_t bytes) {
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, VM_FLAGS_SUPERPAGE_SIZE_2MB, 0);
#elif defined(__FreeBSD__)
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_ALIGNED_SUPER, -1, 0);
#elif defined(__OpenBSD__)
#elif defined(__OpenBSD__) || defined(__NetBSD__)
mem = MAP_FAILED; // OpenBSD does not support huge pages
#else
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, -1, 0);