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comparison mem.c @ 883:9f149f0e98b7

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It is now possible to switch back and forth between the menu ROM and the game
author Michael Pavone <pavone@retrodev.com>
date Fri, 13 Nov 2015 19:15:37 -0800
parents c3e3a0d734e2
children 6bafe1988e8c
comparison
equal deleted inserted replaced
882:75453bf2ffac 883:9f149f0e98b7
1 /* 1 /*
2 Copyright 2013 Michael Pavone 2 Copyright 2013 Michael Pavone
3 This file is part of BlastEm. 3 This file is part of BlastEm.
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. 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.
5 */ 5 */
6 #include <sys/mman.h> 6 #include <sys/mman.h>
7 #include <stddef.h> 7 #include <stddef.h>
8 #include <stdint.h> 8 #include <stdint.h>
10 #include <unistd.h> 10 #include <unistd.h>
11 #include <errno.h> 11 #include <errno.h>
12 #include <stdio.h> 12 #include <stdio.h>
13 13
14 #include "mem.h" 14 #include "mem.h"
15 #include "arena.h"
15 #ifndef MAP_ANONYMOUS 16 #ifndef MAP_ANONYMOUS
16 #define MAP_ANONYMOUS MAP_ANON 17 #define MAP_ANONYMOUS MAP_ANON
17 #endif 18 #endif
18 19
19 #ifndef MAP_32BIT 20 #ifndef MAP_32BIT
23 void * alloc_code(size_t *size) 24 void * alloc_code(size_t *size)
24 { 25 {
25 //start at the 1GB mark to allow plenty of room for sbrk based malloc implementations 26 //start at the 1GB mark to allow plenty of room for sbrk based malloc implementations
26 //while still keeping well within 32-bit displacement range for calling code compiled into the executable 27 //while still keeping well within 32-bit displacement range for calling code compiled into the executable
27 static uint8_t *next = (uint8_t *)0x40000000; 28 static uint8_t *next = (uint8_t *)0x40000000;
29 uint8_t *ret = try_alloc_arena();
30 if (ret) {
31 return ret;
32 }
28 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); 33 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
29 uint8_t *ret = mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0); 34 ret = mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
30 if (ret == MAP_FAILED) { 35 if (ret == MAP_FAILED) {
31 perror("alloc_code"); 36 perror("alloc_code");
32 return NULL; 37 return NULL;
33 } 38 }
34 next = ret + *size; 39 next = ret + *size;