sysdeps/unix/sysv/aix/start.s

   1 /* Copyright (C) 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    In addition to the permissions in the GNU Lesser General Public
  10    License, the Free Software Foundation gives you unlimited
  11    permission to link the compiled version of this file with other
  12    programs, and to distribute those programs without any restriction
  13    coming from the use of this file. (The GNU Lesser General Public
  14    License restrictions do apply in other respects; for example, they
  15    cover modification of the file, and distribution when not linked
  16    into another program.)
  17
  18    Note that people who make modified versions of this file are not
  19    obligated to grant this special exception for their modified
  20    versions; it is their choice whether to do so. The GNU Lesser
  21    General Public License gives permission to release a modified
  22    version without this exception; this exception also makes it
  23    possible to release a modified version which carries forward this
  24    exception.
  25
  26    The GNU C Library is distributed in the hope that it will be useful,
  27    but WITHOUT ANY WARRANTY; without even the implied warranty of
  28    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  29    Lesser General Public License for more details.
  30
  31    You should have received a copy of the GNU Lesser General Public
  32    License along with the GNU C Library; if not, write to the Free
  33    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  34    02111-1307 USA.  */
  35
  36         .file   "start.s"
  37         .toc
  38 T.lsd:  .tc __libc_start_data[tc], __libc_start_data[rw]
  39 T.main: .tc main[tc], main[rw]
  40 T.init: .tc __libc_start_init[tc], __libc_start_init[rw]
  41 T.fini: .tc __libc_start_fini[tc], __libc_start_init[rw]
  42 T.rtld_fini :    .tc __libc_start_rtld_fini[tc], __libc_start_rtld_fini[rw]
  43
  44         .globl __start
  45         .globl .__start
  46         .globl __libc_start_data
  47
  48         .extern .__libc_start_main
  49         .extern .main
  50         .extern main
  51         .extern __libc_start_init
  52         .extern __libc_start_fini
  53         .extern __libc_start_rtld_fini
  54
  55 /* Text */
  56
  57         .csect __start[ds]
  58 __start:
  59         .long .__start, TOC[tc0], 0
  60
  61         .csect .text[pr]
  62 .__start:
  63
  64 /* No prologue needed, __start does not have to follow the ABI.
  65
  66  Input from kernel/loader
  67         r1 :    stack
  68         r2 :    TOC
  69         r3 :    argc
  70         r4 :    argv
  71         r5 :    envp
  72         r28 :   data origin
  73         r29 :   text origin
  74         r30 :   module count
  75         r31 :   default processing flag
  76
  77         If r31 == r30, no special processing is needed, ie r28, r29 & r30
  78         are not used
  79
  80  Save input in __libc_start_data */
  81         l       16, T.lsd(2)
  82         st      1,  0(16)       /* stack */
  83         st      2,  4(16)       /* toc */
  84         st      3,  8(16)       /* argc */
  85         st      4,  12(16)      /* argv */
  86         st      5,  16(16)      /* envp */
  87         st      28, 20(16)      /* data origin */
  88         st      29, 24(16)      /* text origin */
  89         st      30, 28(16)      /* module count */
  90         st      31, 32(16)      /* special */
  91
  92 /* Call __libc_start_main() */
  93
  94         bl      .__libc_start_main
  95         nop
  96
  97 /* No epilog needed, __start does not have to follow the ABI */
  98
  99 /* Trace back */
 100 TB.__start:
 101         .long 0x0
 102         .long 0xc2040
 103         .long 0x0
 104         .long TB.__start - .__start
 105         .short 7
 106         .byte "__start"
 107         .byte 0,0,0
 108
 109 /* Data
 110  __libc_start_data
 111  Space to keep libc initialization information */
 112
 113         .csect __libc_start_data[rw]
 114 __libc_start_data:
 115 /* For kernel/loader input args */
 116         .space 36
 117
 118 /* Externs */
 119         .long main
 120 init:
 121         .long __libc_start_init
 122 fini:
 123         .long __libc_start_fini
 124 rtld_fini:
 125         .long __libc_start_rtld_fini
 126         .space 0x1000 + (4 + rtld_fini - __libc_start_data)