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428
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1 /* C code startup routine.
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2 Copyright (C) 1985, 1986, 1992, 1993 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs 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 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.30. */
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22
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23
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771
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24 /* [[The standard Vax 4.2 Unix crt0.c cannot be used for Emacs
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428
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25 because it makes `environ' an initialized variable.
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26 It is easiest to have a special crt0.c on all machines
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771
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27 though I don't know whether other machines actually need it.]]
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28 This is insane! We DO NOT want to be doing this crap. */
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428
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29
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30 /* On the vax and 68000, in BSD4.2 and USG5.2,
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31 this is the data format on startup:
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32 (vax) ap and fp are unpredictable as far as I know; don't use them.
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33 sp -> word containing argc
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34 word pointing to first arg string
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35 [word pointing to next arg string]... 0 or more times
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36 0
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37 Optionally:
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38 [word pointing to environment variable]... 1 or more times
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39 ...
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40 0
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41 And always:
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42 first arg string
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43 [next arg string]... 0 or more times
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44 */
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45
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46 /* On the 16000, at least in the one 4.2 system I know about,
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47 the initial data format is
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48 sp -> word containing argc
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49 word containing argp
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50 word pointing to first arg string, and so on as above
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51 */
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52
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53 #ifdef emacs
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54 #include <config.h>
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55 #endif
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56
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57 #ifdef __GNUC__
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58 #define asm __asm
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59 #endif
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60
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61 /* Workaround for Sun cc 3.0, which doesn't handle asm's outside a fn. */
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62 #if __SUNPRO_C >= 0x300
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63 #define no_toplevel_asm
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64 #endif
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65
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66 /* ******** WARNING ********
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67 Do not insert any data definitions before data_start!
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68 Since this is the first file linked, the address of the following
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69 variable should correspond to the start of initialized data space.
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70 On some systems this is a constant that is independent of the text
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71 size for shared executables. On others, it is a function of the
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72 text size. In short, this seems to be the most portable way to
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73 discover the start of initialized data space dynamically at runtime,
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74 for either shared or unshared executables, on either swapping or
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75 virtual systems. It only requires that the linker allocate objects
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76 in the order encountered, a reasonable model for most Unix systems.
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77 Similarly, note that the address of _start() should be the start
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78 of text space. Fred Fish, UniSoft Systems Inc. */
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79
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80 int data_start = 0;
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81
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82 #ifdef NEED_ERRNO
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83 int errno;
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84 #endif
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85
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86 char **environ;
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87
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88 #ifndef static
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89 /* On systems where the static storage class is usable, this function
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90 should be declared as static. Otherwise, the static keyword has
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91 been defined to be something else, and code for those systems must
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92 take care of this declaration appropriately. */
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93 static start1 ();
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94 #endif
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95
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96 #ifdef CRT0_DUMMIES
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97
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98 /* Define symbol "start": here; some systems want that symbol. */
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99 #ifdef DOT_GLOBAL_START
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100 asm(" .text ");
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101 asm(" .globl start ");
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102 asm(" start: ");
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103 #endif /* DOT_GLOBAL_START */
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104
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105 #ifdef NODOT_GLOBAL_START
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106 asm(" text ");
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107 asm(" global start ");
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108 asm(" start: ");
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109 #endif /* NODOT_GLOBAL_START */
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110
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111 #ifdef m68000
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112
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113 /* GCC 2.1, when optimization is turned off, seems to want to push a
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114 word of garbage on the stack, which screws up the CRT0_DUMMIES
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115 hack. So we hand-code _start in assembly language. */
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116 asm(".text ");
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117 #ifndef sony_news
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118 asm(" .even ");
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119 #else /* sony_news (not gas) */
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120 + asm(" .align 2 ");
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121 #endif /* sony_news (not gas) */
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122 asm(".globl __start ");
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123 asm("__start: ");
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124 asm(" link a6,#0 ");
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125 asm(" jbsr _start1 ");
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126 asm(" unlk a6 ");
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127 asm(" rts ");
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128
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129 #else /* not m68000 */
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130
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131 int
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132 _start ()
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133 {
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134 start1 ();
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135 }
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136
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137 #endif /* possibly m68000 */
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138
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139 #ifdef __bsdi__ /* for version number */
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140 #include <sys/param.h>
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141 #endif
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142 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501)
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143 char *__progname;
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144 #endif
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145 static int
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146 start1 (CRT0_DUMMIES int argc, char *xargv)
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147 {
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148 char **argv = &xargv;
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149 environ = argv + argc + 1;
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150 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501)
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151 __progname = argv[0];
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152 #endif
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153
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154 if ((char *)environ == xargv)
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155 environ--;
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156 exit (main (argc, argv, environ));
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157
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158 /* Refer to `start1' so GCC will not think it is never called
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159 and optimize it out. */
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160 (void) &start1;
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161 }
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162 #else /* not CRT0_DUMMIES */
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163
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164 /* "m68k" and "m68000" both stand for m68000 processors,
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165 but with different program-entry conventions.
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166 This is a kludge. Now that the CRT0_DUMMIES mechanism above exists,
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167 most of these machines could use the vax code above
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168 with some suitable definition of CRT0_DUMMIES.
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169 Then the symbol m68k could be flushed.
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170 But I don't want to risk breaking these machines
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171 in a version 17 patch release, so that change is being put off. */
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172
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173 #ifdef m68k /* Can't do it all from C */
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174 asm (" global _start");
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175 asm (" text");
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176 asm ("_start:");
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177 #ifndef NU
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178 #ifdef STRIDE
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179 asm (" comm havefpu%,2");
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180 #else /* m68k, not STRIDE */
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181 asm (" comm splimit%,4");
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182 #endif /* STRIDE */
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183 asm (" global exit");
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184 asm (" text");
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185 #ifdef STRIDE
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186 asm (" trap &3");
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187 asm (" mov.w %d0,havefpu%");
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188 #else /* m68k, not STRIDE */
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189 asm (" mov.l %d0,splimit%");
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190 #endif /* STRIDE */
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191 #endif /* not NU */
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192 asm (" jsr start1");
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193 asm (" mov.l %d0,(%sp)");
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194 asm (" jsr exit");
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195 asm (" mov.l &1,%d0"); /* d0 = 1 => exit */
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196 asm (" trap &0");
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197 #else /* m68000, not m68k */
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198
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199 #ifdef m68000
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200 _start ()
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201 {
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202 #ifdef sun
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203 finitfp_();
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204 #endif
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205 /* On 68000, _start pushes a6 onto stack */
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206 start1 ();
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207 }
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208 #endif /* m68000 */
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209 #endif /* m68k */
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210
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211 #if defined(m68k) || defined(m68000)
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212 /* ignore takes care of skipping the a6 value pushed in start. */
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213 static
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214 #if defined(m68k)
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215 start1 (argc, xargv)
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216 #else
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217 start1 (ignore, argc, xargv)
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218 #endif
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219 int argc;
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220 char *xargv;
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221 {
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222 char **argv = &xargv;
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223 environ = argv + argc + 1;
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224
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225 if ((char *)environ == xargv)
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226 environ--;
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227 #ifdef sun_68881
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228 asm(" jsr f68881_used");
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229 #endif
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230 #ifdef sun_fpa
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231 asm(" jsr ffpa_used");
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232 #endif
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233 #ifdef sun_soft
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234 asm(" jsr start_float");
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235 #endif
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236 exit (main (argc, argv, environ));
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237 }
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238
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239 #endif /* m68k or m68000 */
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240
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241 #endif /* not CRT0_DUMMIES */
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242
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243 #ifdef sparc
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244 #ifdef no_toplevel_asm
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245 static no_toplevel_asm_wrapper() {
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246 #ifdef USG5_4
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247 asm (".pushsection \".text\"");
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248 #endif /* USG5_4 */
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249 #endif /* no_toplevel_asm */
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250 #ifdef USG5_4
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251 asm (".global _start");
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252 asm (".text");
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253 asm ("_start:");
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254 asm (" mov 0, %fp");
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255 asm (" ld [%sp + 64], %o0");
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256 asm (" add %sp, 68, %o1");
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257 asm (" sll %o0, 2, %o2");
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258 asm (" add %o2, 4, %o2");
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259 asm (" add %o1, %o2, %o2");
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260 asm (" sethi %hi(_environ), %o3");
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261 asm (" st %o2, [%o3+%lo(_environ)]");
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262 asm (" andn %sp, 7, %sp");
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263 asm (" call main");
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264 asm (" sub %sp, 24, %sp");
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265 asm (" call _exit");
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266 asm (" nop");
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267 #else
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268 asm (".global __start");
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269 asm (".text");
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270 asm ("__start:");
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271 asm (" mov 0, %fp");
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272 asm (" ld [%sp + 64], %o0");
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273 asm (" add %sp, 68, %o1");
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274 asm (" sll %o0, 2, %o2");
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275 asm (" add %o2, 4, %o2");
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276 asm (" add %o1, %o2, %o2");
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277 asm (" sethi %hi(_environ), %o3");
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278 asm (" st %o2, [%o3+%lo(_environ)]");
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279 asm (" andn %sp, 7, %sp");
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280 asm (" call _main");
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281 asm (" sub %sp, 24, %sp");
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282 asm (" call __exit");
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283 asm (" nop");
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284 #endif /* USG5_4 */
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285 #ifdef no_toplevel_asm
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286 #ifdef USG5_4
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287 asm (".popsection");
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288 #endif /* USG5_4 */
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289 } /* no_toplevel_asm_wrapper() */
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290 #endif /* no_toplevel_asm */
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291 #endif /* sparc */
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292
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293 #if __FreeBSD__ == 2
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294 char *__progname;
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295 #endif
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296 #ifdef __bsdi__
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297 #include <sys/param.h> /* for version number */
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298 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501)
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299 char *__progname;
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300 #endif
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301 #endif /* __bsdi__ */
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