mirror of https://github.com/Nonannet/copapy.git
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#ifdef _WIN32
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#include <windows.h>
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/* Windows implementations */
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uint8_t *allocate_executable_memory(uint32_t num_bytes) {
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uint8_t *mem = (uint8_t*)VirtualAlloc(NULL, (SIZE_T)num_bytes,
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MEM_RESERVE | MEM_COMMIT,
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PAGE_READWRITE);
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if (mem == NULL) {
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fprintf(stderr, "VirtualAlloc failed (executable): %lu\n", GetLastError());
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}
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return mem;
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}
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uint8_t *allocate_data_memory(uint32_t num_bytes) {
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/* Allocate RW memory that can later be made executable. */
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uint8_t *mem = (uint8_t*)VirtualAlloc(NULL, (SIZE_T)num_bytes,
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MEM_RESERVE | MEM_COMMIT,
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PAGE_READWRITE);
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if (mem == NULL) {
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fprintf(stderr, "VirtualAlloc failed (data): %lu\n", GetLastError());
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}
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return mem;
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}
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uint8_t *allocate_buffer_memory(uint32_t num_bytes) {
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return (uint8_t*)malloc((size_t)num_bytes);
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}
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int mark_mem_executable(uint8_t *memory, uint32_t memory_len) {
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if (!memory || memory_len == 0) return 0;
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DWORD oldProtect = 0;
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if (!VirtualProtect((LPVOID)memory, (SIZE_T)memory_len, PAGE_EXECUTE_READ, &oldProtect)) {
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fprintf(stderr, "VirtualProtect failed: %lu\n", GetLastError());
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return 0;
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}
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return 1;
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}
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void deallocate_memory(uint8_t *memory, uint32_t memory_len) {
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if (!memory) return;
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if (memory_len) {
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VirtualFree((LPVOID)memory, 0, MEM_RELEASE);
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} else {
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free(memory);
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}
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}
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#else
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#include <sys/mman.h>
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/* POSIX implementations */
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uint8_t *allocate_executable_memory(uint32_t num_bytes) {
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uint8_t *mem = (uint8_t*)mmap(NULL, num_bytes,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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return mem;
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}
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uint8_t *allocate_data_memory(uint32_t num_bytes) {
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/*
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Malloc can not be used since it may return a memory region too far apart
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from the executable memory yielded by mmap for relative 32 bit addressing.
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uint8_t *mem = (uint8_t*)malloc(num_bytes);
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*/
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uint8_t *mem = (uint8_t*)mmap(NULL, num_bytes,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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return mem;
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}
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uint8_t *allocate_buffer_memory(uint32_t num_bytes) {
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return (uint8_t*)malloc((size_t)num_bytes);
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}
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int mark_mem_executable(uint8_t *memory, uint32_t memory_len) {
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if (mprotect(memory, memory_len, PROT_READ | PROT_EXEC) == -1) {
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perror("mprotect failed");
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return 0;
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}
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return 1;
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}
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void deallocate_memory(uint8_t *memory, uint32_t memory_len) {
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if (memory_len) munmap(memory, memory_len);
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}
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#endif
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