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/*
* Copyright (C) 2019 Intel Corporation. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include "platform_api_vmcore.h"
#define TRACE_MEMMAP 0
static DWORD
access_to_win32_flags(int prot)
{
DWORD protect = PAGE_NOACCESS;
if (prot & MMAP_PROT_EXEC) {
if (prot & MMAP_PROT_WRITE)
protect = PAGE_EXECUTE_READWRITE;
else
protect = PAGE_EXECUTE_READ;
}
else if (prot & MMAP_PROT_WRITE) {
protect = PAGE_READWRITE;
}
else if (prot & MMAP_PROT_READ) {
protect = PAGE_READONLY;
}
return protect;
}
void *
os_mmap(void *hint, size_t size, int prot, int flags)
{
DWORD alloc_type = MEM_RESERVE;
DWORD protect;
size_t request_size, page_size;
void *addr;
page_size = os_getpagesize();
request_size = (size + page_size - 1) & ~(page_size - 1);
if (request_size < size)
/* integer overflow */
return NULL;
#if WASM_ENABLE_JIT != 0
/**
* Allocate memory at the highest possible address if the
* request size is large, or LLVM JIT might report error:
* IMAGE_REL_AMD64_ADDR32NB relocation requires an ordered
* section layout.
*/
if (request_size > 10 * BH_MB)
alloc_type |= MEM_TOP_DOWN;
#endif
protect = access_to_win32_flags(prot);
if (protect != PAGE_NOACCESS) {
alloc_type |= MEM_COMMIT;
}
addr = VirtualAlloc((LPVOID)hint, request_size, alloc_type, protect);
#if TRACE_MEMMAP != 0
printf("Map memory, request_size: %zu, alloc_type: 0x%x, "
"protect: 0x%x, ret: %p\n",
request_size, alloc_type, protect, addr);
#endif
return addr;
}
void
os_munmap(void *addr, size_t size)
{
size_t page_size = os_getpagesize();
size_t request_size = (size + page_size - 1) & ~(page_size - 1);
if (addr) {
if (!VirtualFree(addr, request_size, MEM_DECOMMIT)) {
printf("warning: os_munmap decommit pages failed, "
"addr: %p, request_size: %zu, errno: %d\n",
addr, request_size, errno);
return;
}
if (!VirtualFree(addr, 0, MEM_RELEASE)) {
printf("warning: os_munmap release pages failed, "
"addr: %p, size: %zu, errno:%d\n",
addr, request_size, errno);
}
}
#if TRACE_MEMMAP != 0
printf("Unmap memory, addr: %p, request_size: %zu\n", addr, request_size);
#endif
}
void *
os_mem_commit(void *addr, size_t size, int flags)
{
DWORD protect = access_to_win32_flags(flags);
size_t page_size = os_getpagesize();
size_t request_size = (size + page_size - 1) & ~(page_size - 1);
if (!addr)
return NULL;
#if TRACE_MEMMAP != 0
printf("Commit memory, addr: %p, request_size: %zu, protect: 0x%x\n", addr,
request_size, protect);
#endif
return VirtualAlloc((LPVOID)addr, request_size, MEM_COMMIT, protect);
}
void
os_mem_decommit(void *addr, size_t size)
{
size_t page_size = os_getpagesize();
size_t request_size = (size + page_size - 1) & ~(page_size - 1);
if (!addr)
return;
#if TRACE_MEMMAP != 0
printf("Decommit memory, addr: %p, request_size: %zu\n", addr,
request_size);
#endif
VirtualFree((LPVOID)addr, request_size, MEM_DECOMMIT);
}
int
os_mprotect(void *addr, size_t size, int prot)
{
DWORD protect;
size_t page_size = os_getpagesize();
size_t request_size = (size + page_size - 1) & ~(page_size - 1);
if (!addr)
return 0;
protect = access_to_win32_flags(prot);
#if TRACE_MEMMAP != 0
printf("Mprotect memory, addr: %p, request_size: %zu, protect: 0x%x\n",
addr, request_size, protect);
#endif
return VirtualProtect((LPVOID)addr, request_size, protect, NULL);
}
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