+/* Dumb memory allocation routines
+
+ Copyright (C) 1997 Paul Mackerras
+ 1996 Maurizio Plaza
+ 1996 Jakub Jelinek
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "types.h"
+#include "stddef.h"
+
+/* Imported functions */
+extern void prom_printf (char *fmt, ...);
+
+static char *malloc_ptr = 0;
+static char *malloc_top = 0;
+static char *last_alloc = 0;
+
+void malloc_init(void *bottom, unsigned long size)
+{
+ malloc_ptr = bottom;
+ malloc_top = bottom + size;
+}
+
+void malloc_dispose(void)
+{
+ malloc_ptr = 0;
+ last_alloc = 0;
+}
+
+void *malloc (unsigned int size)
+{
+ char *caddr;
+
+ if (!malloc_ptr)
+ return NULL;
+ if ((malloc_ptr + size + sizeof(int)) > malloc_top) {
+ prom_printf("malloc failed\n");
+ return NULL;
+ }
+ *(int *)malloc_ptr = size;
+ caddr = malloc_ptr + sizeof(int);
+ malloc_ptr += size + sizeof(int);
+ last_alloc = caddr;
+ malloc_ptr = (char *) ((((unsigned int) malloc_ptr) + 3) & (~3));
+ return caddr;
+}
+
+void *realloc(void *ptr, unsigned int size)
+{
+ char *caddr, *oaddr = ptr;
+
+ if (!malloc_ptr)
+ return NULL;
+ if (oaddr == last_alloc) {
+ if (oaddr + size > malloc_top) {
+ prom_printf("realloc failed\n");
+ return NULL;
+ }
+ *(int *)(oaddr - sizeof(int)) = size;
+ malloc_ptr = oaddr + size;
+ return oaddr;
+ }
+ caddr = malloc(size);
+ if (caddr != 0 && oaddr != 0)
+ memcpy(caddr, oaddr, *(int *)(oaddr - sizeof(int)));
+ return caddr;
+}
+
+void free (void *m)
+{
+ if (!malloc_ptr)
+ return;
+ if (m == last_alloc)
+ malloc_ptr = (char *) last_alloc - sizeof(int);
+}
+
+void mark (void **ptr)
+{
+ if (!malloc_ptr)
+ return;
+ *ptr = (void *) malloc_ptr;
+}
+
+void release (void *ptr)
+{
+ if (!malloc_ptr)
+ return;
+ malloc_ptr = (char *) ptr;
+}
+
+void *strdup(char *str)
+{
+ char *p = malloc(strlen(str) + 1);
+
+ strcpy(p, str);
+ return p;
+}