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annotate mem.c @ 1483:001120e91fed nuklear_ui

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Skip loading menu ROM if Nuklear UI is enabled. Allow disabling Nuklear UI in favor of old menu ROM both at compile time and in config. Fall back to ROM UI if GL is unavailable
author Michael Pavone <pavone@retrodev.com>
date Sat, 25 Nov 2017 20:43:20 -0800
parents 101b5ce682fe
children 8e86cd581620
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include <sys/mman.h>
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7 #include <stddef.h>
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <unistd.h>
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11 #include <errno.h>
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12 #include <stdio.h>
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14 #include "mem.h"
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15 #include "arena.h"
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16 #ifndef MAP_ANONYMOUS
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17 #define MAP_ANONYMOUS MAP_ANON
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18 #endif
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20 #ifndef MAP_32BIT
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21 #define MAP_32BIT 0
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22 #endif
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24 void * alloc_code(size_t *size)
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25 {
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26 //start at the 1GB mark to allow plenty of room for sbrk based malloc implementations
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27 //while still keeping well within 32-bit displacement range for calling code compiled into the executable
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28 static uint8_t *next = (uint8_t *)0x40000000;
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29 uint8_t *ret = try_alloc_arena();
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30 if (ret) {
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31 return ret;
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32 }
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33 if (*size & (PAGE_SIZE -1)) {
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34 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
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35 }
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36 ret = mmap(next, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
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37 if (ret == MAP_FAILED) {
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38 perror("alloc_code");
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39 return NULL;
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40 }
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41 track_block(ret);
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42 next = ret + *size;
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43 return ret;
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44 }
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