1 /* malloc.c - Dumb memory allocation routines
3 * Copyright (C) 1997 Paul Mackerras
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 /* Imported functions */
26 extern void prom_printf (char *fmt, ...);
28 static char *malloc_ptr = 0;
29 static char *malloc_top = 0;
30 static char *last_alloc = 0;
32 void malloc_init(void *bottom, unsigned long size)
35 malloc_top = bottom + size;
38 void malloc_dispose(void)
44 void *malloc (unsigned int size)
50 if ((malloc_ptr + size + sizeof(int)) > malloc_top) {
51 prom_printf("malloc failed\n");
54 *(int *)malloc_ptr = size;
55 caddr = malloc_ptr + sizeof(int);
56 malloc_ptr += size + sizeof(int);
58 malloc_ptr = (char *) ((((unsigned int) malloc_ptr) + 3) & (~3));
62 void *realloc(void *ptr, unsigned int size)
64 char *caddr, *oaddr = ptr;
68 if (oaddr == last_alloc) {
69 if (oaddr + size > malloc_top) {
70 prom_printf("realloc failed\n");
73 *(int *)(oaddr - sizeof(int)) = size;
74 malloc_ptr = oaddr + size;
78 if (caddr != 0 && oaddr != 0)
79 memcpy(caddr, oaddr, *(int *)(oaddr - sizeof(int)));
88 malloc_ptr = (char *) last_alloc - sizeof(int);
91 void mark (void **ptr)
95 *ptr = (void *) malloc_ptr;
98 void release (void *ptr)
102 malloc_ptr = (char *) ptr;
105 char *strdup(char const *str)
107 char *p = malloc(strlen(str) + 1);