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Enable MAP_32BIT for macOS (#2992)

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On macOS, by default, the first 4GB is occupied by the pagezero.
While it can be controlled with link time options, as we are
an library, we usually don't have a control on how to link an
executable.
This commit is contained in:
YAMAMOTO Takashi 2024-01-10 17:19:06 +09:00 committed by GitHub
parent 49ac1e0636
commit 6fa6d6d9a5
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 2 deletions
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6
build-scripts/config_common.cmake
View File

@ -451,3 +451,9 @@ if (WAMR_BUILD_LINUX_PERF EQUAL 1)
add_definitions (-DWASM_ENABLE_LINUX_PERF=1)
message (" Enable linux perf support")
endif ()
if (APPLE)
# On recent macOS versions, by default, the size of page zero is 4GB.
# Shrink it to make MAP_32BIT mmap can work.
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-pagezero_size,0x4000")
endif ()

16
core/shared/platform/common/posix/posix_memmap.c
View File

@ -77,15 +77,19 @@ os_mmap(void *hint, size_t size, int prot, int flags, os_file_handle file)
map_prot |= PROT_EXEC;
#if defined(BUILD_TARGET_X86_64) || defined(BUILD_TARGET_AMD_64)
#ifndef __APPLE__
if (flags & MMAP_MAP_32BIT)
map_flags |= MAP_32BIT;
#endif
#endif
if (flags & MMAP_MAP_FIXED)
map_flags |= MAP_FIXED;
#if defined(BUILD_TARGET_X86_64) || defined(BUILD_TARGET_AMD_64)
#if defined(__APPLE__)
retry_without_map_32bit:
#endif
#endif
#if defined(BUILD_TARGET_RISCV64_LP64D) || defined(BUILD_TARGET_RISCV64_LP64)
/* As AOT relocation in RISCV64 may require that the code/data mapped
* is in range 0 to 2GB, we try to map the memory with hint address
@ -143,6 +147,14 @@ os_mmap(void *hint, size_t size, int prot, int flags, os_file_handle file)
}
if (addr == MAP_FAILED) {
#if defined(BUILD_TARGET_X86_64) || defined(BUILD_TARGET_AMD_64)
#if defined(__APPLE__)
if ((map_flags & MAP_32BIT) != 0) {
map_flags &= ~MAP_32BIT;
goto retry_without_map_32bit;
}
#endif
#endif
#if BH_ENABLE_TRACE_MMAP != 0
os_printf("mmap failed\n");
#endif