aplfw/sample/mips/jelly/gcc/crt0.S

   1 /* ------------------------------------------------------------------------ */
   2 /*  Hyper Operating System V4 Advance                                       */
   3 /*    Sample program for Jelly                                              */
   4 /*                                                                          */
   5 /*                                  Copyright (C) 2008 by Project HOS       */
   6 /*                                  http://sourceforge.jp/projects/hos/     */
   7 /* ------------------------------------------------------------------------ */
   8
   9
  10                                 .extern         _kernel_int_isp
  11                                 .extern         _kernel_exc_hdr
  12                                 .extern         ___data
  13                                 .extern         ___data_end
  14                                 .extern         ___data_rom
  15                                 .extern         ___bss
  16                                 .extern         ___bss_end
  17                                 .extern         _gp
  18                                 .extern         main
  19
  20                                 .global         _reset_handler
  21                                 .global         _exception_handler
  22
  23
  24
  25                                 .text
  26                                 .set    noreorder
  27
  28
  29 /************************************************
  30   %jp{リセットハンドラ}
  31 ************************************************/
  32                                 .ent    _reset_handler
  33 _reset_handler:
  34                                 nop
  35                                 nop
  36
  37                                 la              $gp, _gp
  38                                 la              $8, _kernel_int_isp
  39                                 lw              $sp, 0($8)
  40
  41
  42                                 // BSS initialize
  43                                 la              $8, ___bss
  44                                 la              $9, ___bss_end
  45                                 beq             $8, $9, bss_loop_end
  46                                 nop
  47
  48 bss_loop:
  49                                 sw              $0, ($8)
  50                                 addi    $8, $8, 4
  51                                 bne             $8, $9, bss_loop
  52                                 nop
  53 bss_loop_end:
  54
  55
  56                                 // DATA copy
  57                                 la              $8, ___data
  58                                 la              $9, ___data_end
  59                                 la              $10, ___data_rom
  60                                 beq             $8, $9, data_loop_end
  61                                 nop
  62
  63 data_loop:
  64                                 lw              $11, ($10)
  65                                 addi    $10, $10, 4
  66                                 sw              $11, ($8)
  67                                 addi    $8, $8, 4
  68                                 bne             $8, $9, data_loop
  69                                 nop
  70 data_loop_end:
  71
  72
  73                                 la              $8, main
  74                                 jal             $8
  75                                 nop
  76                                 j               _reset_handler
  77                                 nop
  78
  79                                 .end    _reset_handler
  80
  81
  82
  83 /************************************************
  84   %jp{例外ハンドラ}
  85 ************************************************/
  86                                 .org    0x180
  87                                 .ent    _exception_handler
  88 _exception_handler:
  89                                 la              $26, _kernel_exc_hdr
  90                                 jr              $26
  91                                 nop
  92
  93                                 .end    _exception_handler
  94
  95
  96
  97 /* end of file */