annotate mem.c @ 95:dd3c680c618c

Initial work on allowing dynamic branches and code in RAM plus a small fix to effective address decoding
author Mike Pavone <pavone@retrodev.com>
date Thu, 27 Dec 2012 21:19:58 -0800
parents 3e7bfde7606e
children 140af5509ce7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
14
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
1 #include <sys/mman.h>
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
2 #include <stddef.h>
18
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
3 #include <stdint.h>
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
4 #include <stdlib.h>
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
5 #include <unistd.h>
14
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
6 #include "mem.h"
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
7
18
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
8 /*
14
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
9 void * alloc_code(size_t *size)
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
10 {
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
11 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
12 return mmap(NULL, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
13 }
18
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
14 */
14
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
15
18
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
16 /*
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
17 void * alloc_code(size_t *size)
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
18 {
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
19 char * ret = malloc(*size);
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
20 char * base = (char *)(((intptr_t)ret) & (~(PAGE_SIZE-1)));
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
21 mprotect(base, (ret + *size) - base, PROT_EXEC | PROT_READ | PROT_WRITE);
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
22 return ret;
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
23 }
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
24 */
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
25
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
26 void * alloc_code(size_t *size)
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
27 {
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
28 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
29 void * ret = sbrk(*size);
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
30 if (ret == ((void *)-1)) {
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
31 return NULL;
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
32 }
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
33 mprotect(ret, *size, PROT_EXEC | PROT_READ | PROT_WRITE);
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
34 return ret;
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
35 }