Mercurial > repos > blastem

comparison mem.c @ 18:3e7bfde7606e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
M68K to x86 translation works for a limited subset of instructions and addressing modes
author Mike Pavone <pavone@retrodev.com>
date Tue, 04 Dec 2012 19:13:12 -0800
parents 2bdad0f52f42
children 140af5509ce7
comparison
equal deleted inserted replaced
17:de0085d4ea40 18:3e7bfde7606e
1 #include <sys/mman.h> 1 #include <sys/mman.h>
2 #include <stddef.h> 2 #include <stddef.h>
3 #include <stdint.h>
4 #include <stdlib.h>
5 #include <unistd.h>
3 #include "mem.h" 6 #include "mem.h"
4 7
8 /*
5 void * alloc_code(size_t *size) 9 void * alloc_code(size_t *size)
6 { 10 {
7 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); 11 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
8 return mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 12 return mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
9 } 13 }
14 */
10 15
16 /*
17 void * alloc_code(size_t *size)
18 {
19 char * ret = malloc(*size);
20 char * base = (char *)(((intptr_t)ret) & (~(PAGE_SIZE-1)));
21 mprotect(base, (ret + *size) - base, PROT_EXEC | PROT_READ | PROT_WRITE);
22 return ret;
23 }
24 */
25
26 void * alloc_code(size_t *size)
27 {
28 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
29 void * ret = sbrk(*size);
30 if (ret == ((void *)-1)) {
31 return NULL;
32 }
33 mprotect(ret, *size, PROT_EXEC | PROT_READ | PROT_WRITE);
34 return ret;
35 }