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annotate mem.c @ 995:2bc27415565b

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Fix some stuff with interrupt timing. The change in adjust_int_cycle gets Overdrive working again (vint was not being preferred over hint in some cases). One of the changes seems to have broken Fatal Rewind again, but no other regressions that I can see.
author Michael Pavone <pavone@retrodev.com>
date Sat, 30 Apr 2016 08:37:55 -0700
parents 6bafe1988e8c
children 101b5ce682fe
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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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19
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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 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
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34 ret = mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
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35 if (ret == MAP_FAILED) {
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36 perror("alloc_code");
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37 return NULL;
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38 }
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39 track_block(ret);
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40 next = ret + *size;
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41 return ret;
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42 }
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