libc/stdlib/memory.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <string.h>
  21
  22
  23 void *malloc (size_t size)
  24 {
  25         void *p = 0;
  26
  27         asm volatile (
  28                 "movl $14, %%eax;"
  29                 "movl %1, %%ebx;"
  30                 "int $0x80;"
  31                 "movl %%eax, %0;": "=g" (p) : "g" ((unsigned) size) : "%eax", "%ebx");
  32
  33         return (void *) p;
  34 }
  35
  36 void *calloc (size_t nmemb, size_t size)
  37 {
  38         void *p = malloc (nmemb * size);
  39
  40         if (p)
  41                 memset (p, 0, nmemb * size);
  42
  43         return p;
  44 }
  45
  46 void free (void *blk)
  47 {
  48         asm volatile (
  49                 "movl $43, %%eax;"
  50                 "movl %0, %%ebx;"
  51                 "int $0x80;" :: "b" (blk) : "%eax", "memory");
  52 }
  53
  54 void *realloc (void *blk, size_t size)
  55 {
  56         void *p = 0;
  57
  58         asm volatile (
  59                 "movl $44, %%eax;"
  60                 "movl %1, %%ebx;"
  61                 "movl %2, %%ecx;"
  62                 "int $0x80;"
  63                 "movl %%eax, %0;": "=g" (p) : "b" (blk), "g" ((unsigned) size) : "%eax", "memory", "%ecx");
  64
  65         return (void *) p;
  66 }