sample/mb/smm/gcc/crt0.S

   1 /* ------------------------------------------------------------------------ */
   2 /*  Hyper Operating System V4 Advance                                       */
   3 /*    Sample program for MicroBlaze                                         */
   4 /*                                                                          */
   5 /*                                  Copyright (C) 1998-2011 by Project HOS  */
   6 /*                                  http://sourceforge.jp/projects/hos/     */
   7 /* ------------------------------------------------------------------------ */
   8
   9
  10                                 .extern         _kernel_int_isp
  11                                 .extern         ___data
  12                                 .extern         ___data_end
  13                                 .extern         ___bss
  14                                 .extern         ___bss_end
  15                                 .extern         main
  16
  17                                 .global         _reset_handler
  18
  19                                 .text
  20
  21
  22
  23 /************************************************
  24   リセットハンドラ
  25 ************************************************/
  26                                 .align          2
  27 _reset_handler:
  28                                 /* スタック設定 */
  29                                 lwi             r1, r0, _kernel_int_isp
  30
  31                                 addik   r3, r0, ___data
  32                                 addik   r4, r0, ___data_end
  33                                 addik   r5, r0, ___data_ro
  34
  35                                 /* DATA領域のコピー */
  36                                 cmpu    r18, r4, r3
  37                                 bgei    r18, data_loop_end
  38 data_loop:
  39                                 lwi             r6, r5, 0
  40                                 swi             r6, r3, 0
  41                                 addik   r3, r3, 4
  42                                 cmpu    r18, r4, r3
  43                                 bltid   r18, data_loop
  44                                 addik   r5, r5, 4
  45 data_loop_end:
  46
  47                                 /* BSS領域の初期化 */
  48                                 addik   r3, r0, ___bss
  49                                 addik   r4, r0, ___bss_end
  50                                 cmpu    r18,r4, r3
  51                                 bgei    r18, bss_loop_end
  52 bss_loop:
  53                                 swi             r0, r3, 0
  54                                 addik   r3, r3, 4
  55                                 cmpu    r18, r4, r3
  56                                 blti    r18, bss_loop
  57 bss_loop_end:
  58
  59
  60                                 /* main関数の呼び出し */
  61                                 brlid   r15, main
  62                                 nop
  63
  64 exit_loop:
  65                                 bri             exit_loop
  66
  67
  68
  69 /* end of file */