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.
26 /* Imported functions */
27 extern void prom_printf (char *fmt, ...);
29 static char *malloc_ptr = 0;
30 static char *malloc_top = 0;
31 static char *last_alloc = 0;
33 void malloc_init(void *bottom, unsigned long size)
36 malloc_top = bottom + size;
39 void malloc_dispose(void)
45 void *malloc (unsigned int size)
51 if ((malloc_ptr + size + sizeof(int)) > malloc_top) {
52 prom_printf("malloc failed\n");
55 *(int *)malloc_ptr = size;
56 caddr = malloc_ptr + sizeof(int);
57 malloc_ptr += size + sizeof(int);
59 malloc_ptr = (char *) ((((unsigned int) malloc_ptr) + 3) & (~3));
63 void *realloc(void *ptr, unsigned int size)
65 char *caddr, *oaddr = ptr;
69 if (oaddr == last_alloc) {
70 if (oaddr + size > malloc_top) {
71 prom_printf("realloc failed\n");
74 *(int *)(oaddr - sizeof(int)) = size;
75 malloc_ptr = oaddr + size;
79 if (caddr != 0 && oaddr != 0)
80 memcpy(caddr, oaddr, *(int *)(oaddr - sizeof(int)));
89 malloc_ptr = (char *) last_alloc - sizeof(int);
92 void mark (void **ptr)
96 *ptr = (void *) malloc_ptr;
99 void release (void *ptr)
103 malloc_ptr = (char *) ptr;
106 char *strdup(char const *str)
108 char *p = malloc(strlen(str) + 1);