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1 ! crt1.s for sparc & sparcv9 (SunOS 5)
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2
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3 ! Copyright (C) 1992, 2009 Free Software Foundation, Inc.
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4 ! Written By David Vinayak Henkel-Wallace, June 1992
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5 !
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6 ! This file is free software; you can redistribute it and/or modify it
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7 ! under the terms of the GNU General Public License as published by the
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8 ! Free Software Foundation; either version 3, or (at your option) any
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9 ! later version.
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10 !
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11 ! This file is distributed in the hope that it will be useful, but
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12 ! WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ! General Public License for more details.
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15 !
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16 ! Under Section 7 of GPL version 3, you are granted additional
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17 ! permissions described in the GCC Runtime Library Exception, version
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18 ! 3.1, as published by the Free Software Foundation.
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19 !
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20 ! You should have received a copy of the GNU General Public License and
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21 ! a copy of the GCC Runtime Library Exception along with this program;
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22 ! see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 ! <http://www.gnu.org/licenses/>.
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24
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25 ! This file takes control of the process from the kernel, as specified
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26 ! in section 3 of the SVr4 ABI.
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27 ! This file is the first thing linked into any executable.
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28
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29 #ifdef __sparcv9
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30 #define CPTRSIZE 8
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31 #define CPTRSHIFT 3
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32 #define STACK_BIAS 2047
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33 #define ldn ldx
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34 #define stn stx
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35 #define setn(s, scratch, dst) setx s, scratch, dst
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36 #else
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37 #define CPTRSIZE 4
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38 #define CPTRSHIFT 2
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39 #define STACK_BIAS 0
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40 #define ldn ld
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41 #define stn st
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42 #define setn(s, scratch, dst) set s, dst
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43 #endif
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44
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45 .section ".text"
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46 .proc 022
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47 .global _start
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48
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49 _start:
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50 mov 0, %fp ! Mark bottom frame pointer
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51 ldn [%sp + (16 * CPTRSIZE) + STACK_BIAS], %l0 ! argc
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52 add %sp, (17 * CPTRSIZE) + STACK_BIAS, %l1 ! argv
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53
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54 ! Leave some room for a call. Sun leaves 32 octets (to sit on
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55 ! a cache line?) so we do too.
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56 #ifdef __sparcv9
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57 sub %sp, 48, %sp
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58 #else
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59 sub %sp, 32, %sp
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60 #endif
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61
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62 ! %g1 may contain a function to be registered w/atexit
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63 orcc %g0, %g1, %g0
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64 #ifdef __sparcv9
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65 be %xcc, .nope
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66 #else
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67 be .nope
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68 #endif
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69 mov %g1, %o0
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70 call atexit
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71 nop
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72 .nope:
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73 ! Now make sure constructors and destructors are handled.
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74 setn(_fini, %o1, %o0)
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75 call atexit, 1
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76 nop
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77 call _init, 0
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78 nop
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79
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80 ! We ignore the auxiliary vector; there is no defined way to
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81 ! access those data anyway. Instead, go straight to main:
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82 mov %l0, %o0 ! argc
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83 mov %l1, %o1 ! argv
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84 #ifdef GCRT1
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85 setn(___Argv, %o4, %o3)
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86 stn %o1, [%o3] ! *___Argv
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87 #endif
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88 ! Skip argc words past argv, to env:
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89 sll %l0, CPTRSHIFT, %o2
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90 add %o2, CPTRSIZE, %o2
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91 add %l1, %o2, %o2 ! env
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92 setn(_environ, %o4, %o3)
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93 stn %o2, [%o3] ! *_environ
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94 call main, 4
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95 nop
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96 call exit, 0
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97 nop
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98 call _exit, 0
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99 nop
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100 ! We should never get here.
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101
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102 .type _start,#function
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103 .size _start,.-_start
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