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1 /* Startup code for M68HC11.
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2 Copyright (C) 1999, 2000, 2002, 2008, 2009 Free Software Foundation, Inc.
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3
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4 This file is free software; you can redistribute it and/or modify it
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5 under the terms of the GNU General Public License as published by the
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6 Free Software Foundation; either version 3, or (at your option) any
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7 later version.
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8
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9 This file is distributed in the hope that it will be useful, but
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10 WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 General Public License for more details.
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13
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14 Under Section 7 of GPL version 3, you are granted additional
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15 permissions described in the GCC Runtime Library Exception, version
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16 3.1, as published by the Free Software Foundation.
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17
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18 You should have received a copy of the GNU General Public License and
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19 a copy of the GCC Runtime Library Exception along with this program;
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20 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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21 <http://www.gnu.org/licenses/>. */
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22
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23 ;-----------------------------------------
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24 ; startup code
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25 ;-----------------------------------------
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26
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27 #ifdef __HAVE_SHORT_INT__
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28 .mode mshort
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29 #else
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30 .mode mlong
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31 #endif
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32
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33 #if defined(__USE_RTC__) && defined(mc68hc12)
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34 .macro jsr name
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35 call \name
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36 .endm
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37 #endif
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38 ;;
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39 ;;
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40 ;; The linker concatenate the .install* sections in the following order:
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41 ;;
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42 ;; .install0 Setup the stack pointer
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43 ;; .install1 Place holder for applications
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44 ;; .install2 Optional installation of data section in memory
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45 ;; .install3 Place holder for applications
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46 ;; .install4 Invokes the main
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47 ;;
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48 .sect .install0,"ax",@progbits
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49 .globl _start
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50
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51 _start:
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52 ;;
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53 ;; At this step, the stack is not initialized and interrupts are masked.
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54 ;; Applications only have 64 cycles to initialize some registers.
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55 ;;
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56 ;; To have a generic/configurable startup, initialize the stack to
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57 ;; the end of some memory region. The _stack symbol is defined by
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58 ;; the linker.
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59 ;;
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60 lds #_stack
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61
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62 .sect .install2,"ax",@progbits
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63 ;;
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64 ;; Call a specific initialization operation. The default is empty.
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65 ;; It can be overridden by applications. It is intended to initialize
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66 ;; the 68hc11 registers. Function prototype is:
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67 ;;
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68 ;; int __premain(void);
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69 ;;
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70 jsr __premain
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71
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72 ;;
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73 ;;
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74 ;;
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75 .sect .install4,"ax",@progbits
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76 jsr main
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77 fatal:
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78 jsr exit
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79 bra fatal
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80
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81 ;-----------------------------------------
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82 ; end startup code
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83 ;-----------------------------------------
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84 ;; Force loading of data section mapping and bss clear
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85 .2byte __map_data_section
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86 .2byte __init_bss_section
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