Mercurial > repos > blastem
view mem.c @ 2488:bfd09d3367ba
Fix crash when enabling VGM recording while running Pico or Copera software
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 15 Apr 2024 23:07:18 -0700 |
parents | 7d851046f035 |
children |
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/* Copyright 2013 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include <sys/mman.h> #include <stddef.h> #include <stdint.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <stdio.h> #include "mem.h" #include "arena.h" #ifndef MAP_ANONYMOUS #define MAP_ANONYMOUS MAP_ANON #endif void * alloc_code(size_t *size) { //start at 1GB above compiled code to allow plenty of room for sbrk based malloc implementations //while still keeping well within 32-bit displacement range for calling code compiled into the executable static uint8_t *next = ((uint8_t *)alloc_code) + 0x40000000; uint8_t *ret = try_alloc_arena(); if (ret) { return ret; } if (*size & (PAGE_SIZE -1)) { *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); } ret = mmap(next, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); if (ret == MAP_FAILED) { perror("alloc_code"); return NULL; } track_block(ret); next = ret + *size; return ret; }