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0
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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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24 /* The standard Vax 4.2 Unix crt0.c cannot be used for Emacs
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25 because it makes `envron' an initialized variable.
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26 It is easiest to have a special crt0.c on all machines
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27 though I don't know whether other machines actually need it. */
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28
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29 /* On the vax and 68000, in BSD4.2 and USG5.2,
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30 this is the data format on startup:
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31 (vax) ap and fp are unpredictable as far as I know; don't use them.
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32 sp -> word containing argc
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33 word pointing to first arg string
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34 [word pointing to next arg string]... 0 or more times
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35 0
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36 Optionally:
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37 [word pointing to environment variable]... 1 or more times
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38 ...
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39 0
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40 And always:
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41 first arg string
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42 [next arg string]... 0 or more times
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43 */
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44
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45 /* On the 16000, at least in the one 4.2 system I know about,
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46 the initial data format is
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47 sp -> word containing argc
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48 word containing argp
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49 word pointing to first arg string, and so on as above
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50 */
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51
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52 #ifdef emacs
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53 #include <config.h>
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54 #endif
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55
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56 #ifdef __GNUC__
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57 #define asm __asm
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58 #endif
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59
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60 /* Workaround for Sun cc 3.0, which doesn't handle asm's outside a fn. */
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61 #if __SUNPRO_C >= 0x300
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62 #define no_toplevel_asm
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63 #endif
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64
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65 /* ******** WARNING ********
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66 Do not insert any data definitions before data_start!
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67 Since this is the first file linked, the address of the following
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68 variable should correspond to the start of initialized data space.
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69 On some systems this is a constant that is independent of the text
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70 size for shared executables. On others, it is a function of the
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71 text size. In short, this seems to be the most portable way to
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72 discover the start of initialized data space dynamically at runtime,
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73 for either shared or unshared executables, on either swapping or
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74 virtual systems. It only requires that the linker allocate objects
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75 in the order encountered, a reasonable model for most Unix systems.
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76 Similarly, note that the address of _start() should be the start
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77 of text space. Fred Fish, UniSoft Systems Inc. */
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78
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79 int data_start = 0;
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80
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81 #ifdef NEED_ERRNO
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82 int errno;
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83 #endif
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84
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85 #ifndef DONT_NEED_ENVIRON
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86 char **environ;
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87 #endif
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88
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89 #ifndef static
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90 /* On systems where the static storage class is usable, this function
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91 should be declared as static. Otherwise, the static keyword has
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92 been defined to be something else, and code for those systems must
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93 take care of this declaration appropriately. */
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94 static start1 ();
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95 #endif
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96
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97 #ifdef APOLLO
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98 extern char *malloc(), *realloc(), *(*_libc_malloc) (), *(*_libc_realloc)();
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99 extern void free(), (*_libc_free) (); extern int main();
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100 std_$call void unix_$main();
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101
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102 _start()
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103 {
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104 _libc_malloc = malloc;
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105 _libc_realloc = realloc;
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106 _libc_free = free;
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107 unix_$main(main); /* no return */
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108 }
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109 #endif /* APOLLO */
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110
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111 #if defined(orion) || defined(pyramid) || defined(celerity) || defined(ALLIANT) || defined(clipper) || defined(sps7)
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112
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113 #if defined(sps7) && defined(V3x)
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114 asm(" section 10");
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115 asm(" ds.b 0xb0");
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116 #endif
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117
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118 #ifdef ALLIANT
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119 /* _start must initialize _curbrk and _minbrk on the first startup;
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120 when starting up after dumping, it must initialize them to what they were
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121 before the dumping, since they are in the shared library and
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122 are not dumped. See ADJUST_EXEC_HEADER in m-alliant.h. */
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123 extern unsigned char *_curbrk, *_minbrk;
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124 extern unsigned char end;
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125 unsigned char *_setbrk = &end;
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126 #ifdef ALLIANT_2800
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127 unsigned char *_end = &end;
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128 #endif
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129 #endif
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130
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131 #ifndef DUMMIES
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132 #define DUMMIES
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133 #endif
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134
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135 _start (DUMMIES argc, argv, envp)
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136 int argc;
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137 char **argv, **envp;
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138 {
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139 #ifdef ALLIANT
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140 #ifdef ALLIANT_2800
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141 _curbrk = _end;
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142 _minbrk = _end;
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143 #else
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144 _curbrk = _setbrk;
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145 _minbrk = _setbrk;
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146 #endif
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147 #endif
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148
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149 environ = envp;
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150
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151 exit (main (argc, argv, envp));
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152 }
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153
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154 #endif /* orion or pyramid or celerity or alliant or clipper */
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155
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156 #if defined (ns16000) && !defined (sequent) && !defined (UMAX) && !defined (CRT0_DUMMIES)
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157
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158 _start ()
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159 {
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160 /* On 16000, _start pushes fp onto stack */
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161 start1 ();
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162 }
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163
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164 /* ignore takes care of skipping the fp value pushed in start. */
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165 static
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166 start1 (ignore, argc, argv)
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167 int ignore;
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168 int argc;
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169 char **argv;
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170 {
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171 environ = argv + argc + 1;
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172
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173 if (environ == *argv)
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174 environ--;
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175 exit (main (argc, argv, environ));
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176 }
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177 #endif /* ns16000, not sequent and not UMAX, and not the CRT0_DUMMIES method */
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178
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179 #ifdef UMAX
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180 _start()
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181 {
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182 asm(" exit [] # undo enter");
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183 asm(" .set exitsc,1");
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184 asm(" .set sigcatchall,0x400");
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185
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186 asm(" .globl _exit");
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187 asm(" .globl start");
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188 asm(" .globl __start");
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189 asm(" .globl _main");
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190 asm(" .globl _environ");
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191 asm(" .globl _sigvec");
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192 asm(" .globl sigentry");
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193
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194 asm("start:");
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195 asm(" br .xstart");
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196 asm(" .org 0x20");
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197 asm(" .double p_glbl,0,0xf00000,0");
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198 asm(" .org 0x30");
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199 asm(".xstart:");
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200 asm(" adjspb $8");
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201 asm(" movd 8(sp),0(sp) # argc");
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202 asm(" addr 12(sp),r0");
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203 asm(" movd r0,4(sp) # argv");
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204 asm("L1:");
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205 asm(" movd r0,r1");
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206 asm(" addqd $4,r0");
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207 asm(" cmpqd $0,0(r1) # null args term ?");
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208 asm(" bne L1");
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209 asm(" cmpd r0,0(4(sp)) # end of 'env' or 'argv' ?");
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210 asm(" blt L2");
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211 asm(" addqd $-4,r0 # envp's are in list");
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212 asm("L2:");
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213 asm(" movd r0,8(sp) # env");
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214 asm(" movd r0,@_environ # indir is 0 if no env ; not 0 if env");
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215 asm(" movqd $0,tos # setup intermediate signal handler");
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216 asm(" addr @sv,tos");
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217 asm(" movzwd $sigcatchall,tos");
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218 asm(" jsr @_sigvec");
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219 asm(" adjspb $-12");
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220 asm(" jsr @_main");
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221 asm(" adjspb $-12");
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222 asm(" movd r0,tos");
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223 asm(" jsr @_exit");
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224 asm(" adjspb $-4");
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225 asm(" addr @exitsc,r0");
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226 asm(" svc");
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227 asm(" .align 4 # sigvec arg");
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228 asm("sv:");
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229 asm(" .double sigentry");
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230 asm(" .double 0");
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231 asm(" .double 0");
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232
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233 asm(" .comm p_glbl,1");
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234 }
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235 #endif /* UMAX */
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236
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237 #ifdef CRT0_DUMMIES
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238
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239 /* Define symbol "start": here; some systems want that symbol. */
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240 #ifdef DOT_GLOBAL_START
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241 asm(" .text ");
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242 asm(" .globl start ");
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243 asm(" start: ");
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244 #endif /* DOT_GLOBAL_START */
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245
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246 #ifdef NODOT_GLOBAL_START
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247 asm(" text ");
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248 asm(" global start ");
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249 asm(" start: ");
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250 #endif /* NODOT_GLOBAL_START */
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251
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252 #ifdef m68000
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253
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254 /* GCC 2.1, when optimization is turned off, seems to want to push a
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255 word of garbage on the stack, which screws up the CRT0_DUMMIES
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256 hack. So we hand-code _start in assembly language. */
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257 asm(".text ");
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258 #ifndef sony_news
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259 asm(" .even ");
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260 #else /* sony_news (not gas) */
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261 + asm(" .align 2 ");
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262 #endif /* sony_news (not gas) */
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263 asm(".globl __start ");
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264 asm("__start: ");
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265 asm(" link a6,#0 ");
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266 asm(" jbsr _start1 ");
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267 asm(" unlk a6 ");
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268 asm(" rts ");
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269
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270 #else /* not m68000 */
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271
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272 int
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273 _start ()
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274 {
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275 /* On vax, nothing is pushed here */
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276 /* On sequent, bogus fp is pushed here */
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277 start1 ();
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278 }
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279
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280 #endif /* possibly m68000 */
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281
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282 #ifdef __bsdi__ /* for version number */
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283 #include <sys/param.h>
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284 #endif
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285 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501)
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286 char *__progname;
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287 #endif
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288 static int
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289 start1 (CRT0_DUMMIES int argc, char *xargv)
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290 {
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291 char **argv = &xargv;
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292 environ = argv + argc + 1;
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293 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501)
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294 __progname = argv[0];
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295 #endif
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296
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297 if ((char *)environ == xargv)
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298 environ--;
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299 exit (main (argc, argv, environ));
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300
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301 /* Refer to `start1' so GCC will not think it is never called
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302 and optimize it out. */
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303 (void) &start1;
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304 }
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305 #else /* not CRT0_DUMMIES */
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306
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307 /* "m68k" and "m68000" both stand for m68000 processors,
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308 but with different program-entry conventions.
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309 This is a kludge. Now that the CRT0_DUMMIES mechanism above exists,
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310 most of these machines could use the vax code above
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311 with some suitable definition of CRT0_DUMMIES.
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312 Then the symbol m68k could be flushed.
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313 But I don't want to risk breaking these machines
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314 in a version 17 patch release, so that change is being put off. */
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315
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316 #ifdef m68k /* Can't do it all from C */
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317 asm (" global _start");
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318 asm (" text");
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319 asm ("_start:");
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320 #ifndef NU
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321 #ifdef STRIDE
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322 asm (" comm havefpu%,2");
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323 #else /* m68k, not STRIDE */
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324 asm (" comm splimit%,4");
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325 #endif /* STRIDE */
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326 asm (" global exit");
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327 asm (" text");
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328 #ifdef STRIDE
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329 asm (" trap &3");
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330 asm (" mov.w %d0,havefpu%");
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331 #else /* m68k, not STRIDE */
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332 asm (" mov.l %d0,splimit%");
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333 #endif /* STRIDE */
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334 #endif /* not NU */
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335 asm (" jsr start1");
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336 asm (" mov.l %d0,(%sp)");
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337 asm (" jsr exit");
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338 asm (" mov.l &1,%d0"); /* d0 = 1 => exit */
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339 asm (" trap &0");
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340 #else /* m68000, not m68k */
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341
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342 #ifdef m68000
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343
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344 #ifdef ISI68K
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345 /* Added by ESM Sun May 24 12:44:02 1987 to get new ISI library to work */
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346 /* Edited by Ray Mon May 15 15:59:56 EST 1989 so we can compile with gcc */
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347 #if defined(BSD4_3) && !defined(__GNUC__)
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348 static foo () {
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349 #endif
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350 asm (" .globl is68020");
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351 asm ("is68020:");
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352 #ifndef BSD4_3
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353 asm (" .long 0x00000000");
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354 asm (" .long 0xffffffff");
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355 /* End of stuff added by ESM */
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356 #endif
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357 asm (" .text");
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358 asm (" .globl __start");
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359 asm ("__start:");
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360 asm (" .word 0");
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361 asm (" link a6,#0");
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362 asm (" jbsr _start1");
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363 asm (" unlk a6");
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364 asm (" rts");
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365 #if defined(BSD4_3) && !defined(__GNUC__)
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366 }
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367 #endif
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368 #else /* not ISI68K */
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369
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370 _start ()
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371 {
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372 #ifdef sun
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373 #ifdef LISP_FLOAT_TYPE
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374 finitfp_();
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375 #endif
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376 #endif
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377 /* On 68000, _start pushes a6 onto stack */
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378 start1 ();
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379 }
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380 #endif /* not ISI68k */
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381 #endif /* m68000 */
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382 #endif /* m68k */
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383
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384 #if defined(m68k) || defined(m68000)
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385 /* ignore takes care of skipping the a6 value pushed in start. */
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386 static
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387 #if defined(m68k)
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388 start1 (argc, xargv)
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389 #else
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390 start1 (ignore, argc, xargv)
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391 #endif
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392 int argc;
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393 char *xargv;
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394 {
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395 char **argv = &xargv;
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396 environ = argv + argc + 1;
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397
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398 if ((char *)environ == xargv)
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399 environ--;
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400 #ifdef sun_68881
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401 asm(" jsr f68881_used");
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402 #endif
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403 #ifdef sun_fpa
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404 asm(" jsr ffpa_used");
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405 #endif
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406 #ifdef sun_soft
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407 asm(" jsr start_float");
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408 #endif
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409 exit (main (argc, argv, environ));
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410 }
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411
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412 #endif /* m68k or m68000 */
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413
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414 #endif /* not CRT0_DUMMIES */
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415
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416 #ifdef hp9000s300
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417 int argc_value;
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418 char **argv_value;
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419 #ifdef OLD_HP_ASSEMBLER
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420 asm(" text");
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421 asm(" globl __start");
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422 asm(" globl _exit");
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423 asm(" globl _main");
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424 asm("__start");
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425 asm(" dc.l 0");
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426 asm(" subq.w #0x1,d0");
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427 asm(" move.w d0,float_soft");
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428 asm(" move.l 0x4(a7),d0");
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429 asm(" beq.s skip_1");
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430 asm(" move.l d0,a0");
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431 asm(" clr.l -0x4(a0)");
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432 asm("skip_1");
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433 asm(" move.l a7,a0");
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434 asm(" subq.l #0x8,a7");
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435 asm(" move.l (a0),(a7)");
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436 asm(" move.l (a0),_argc_value");
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437 asm(" addq.l #0x4,a0");
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438 asm(" move.l a0,0x4(a7)");
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439 asm(" move.l a0,_argv_value");
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440 asm("incr_loop");
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441 asm(" tst.l (a0)+");
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442 asm(" bne.s incr_loop");
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443 asm(" move.l 0x4(a7),a1");
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444 asm(" cmp.l (a1),a0");
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445 asm(" blt.s skip_2");
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446 asm(" subq.l #0x4,a0");
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447 asm("skip_2");
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448 asm(" move.l a0,0x8(a7)");
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449 asm(" move.l a0,_environ");
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450 asm(" jsr _main");
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451 asm(" addq.l #0x8,a7");
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452 asm(" move.l d0,-(a7)");
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453 asm(" jsr _exit");
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454 asm(" move.w #0x1,d0");
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455 asm(" trap #0x0");
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456 asm(" comm float_soft,4");
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457 /* float_soft is allocated in this way because C would
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458 put an underscore character in its name otherwise. */
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459
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460 #else /* new hp assembler */
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461
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462 asm(" text");
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463 asm(" global float_loc");
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464 asm(" set float_loc,0xFFFFB000");
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465 asm(" global fpa_loc");
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466 asm(" set fpa_loc,0xfff08000");
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467 asm(" global __start");
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468 asm(" global _exit");
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469 asm(" global _main");
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470 asm("__start:");
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471 asm(" byte 0,0,0,0");
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472 asm(" subq.w &1,%d0");
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473 asm(" mov.w %d0,float_soft");
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474 asm(" mov.w %d1,flag_68881");
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475 #ifndef HPUX_68010
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476 asm(" beq.b skip_float");
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477 asm(" fmov.l &0x7400,%fpcr");
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478 /* asm(" fmov.l &0x7480,%fpcr"); */
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479 #endif /* HPUX_68010 */
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480 asm("skip_float:");
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481 asm(" mov.l %a0,%d0");
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482 asm(" add.l %d0,%d0");
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483 asm(" subx.w %d1,%d1");
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484 asm(" mov.w %d1,flag_68010");
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485 asm(" add.l %d0,%d0");
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486 asm(" subx.w %d1,%d1");
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487 asm(" mov.w %d1,flag_fpa");
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488 asm(" tst.l %d2");
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489 asm(" ble.b skip_3");
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490 asm(" lsl flag_68881");
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491 asm(" lsl flag_fpa");
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492 asm("skip_3:");
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493 asm(" mov.l 4(%a7),%d0");
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494 asm(" beq.b skip_1");
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495 asm(" mov.l %d0,%a0");
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496 asm(" clr.l -4(%a0)");
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497 asm("skip_1:");
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498 asm(" mov.l %a7,%a0");
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499 asm(" subq.l &8,%a7");
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500 asm(" mov.l (%a0),(%a7)");
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501 asm(" mov.l (%a0),_argc_value");
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502 asm(" addq.l &4,%a0");
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503 asm(" mov.l %a0,4(%a7)");
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504 asm(" mov.l %a0,_argv_value");
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505 asm("incr_loop:");
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506 asm(" tst.l (%a0)+");
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507 asm(" bne.b incr_loop");
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508 asm(" mov.l 4(%a7),%a1");
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509 asm(" cmp.l %a0,(%a1)");
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510 asm(" blt.b skip_2");
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511 asm(" subq.l &4,%a0");
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512 asm("skip_2:");
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513 asm(" mov.l %a0,8(%a7)");
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514 asm(" mov.l %a0,_environ");
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515 asm(" jsr _main");
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516 asm(" addq.l &8,%a7");
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517 asm(" mov.l %d0,-(%a7)");
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518 asm(" jsr _exit");
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519 asm(" mov.w &1,%d0");
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520 asm(" trap &0");
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521 asm(" comm float_soft, 4");
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522 asm(" comm flag_68881, 4");
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523 asm(" comm flag_68010, 4");
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2
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524 asm(" comm flag_68040, 4");
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0
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525 asm(" comm flag_fpa, 4");
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526
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527 #endif /* new hp assembler */
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528 #endif /* hp9000s300 */
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529
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530 #ifdef GOULD
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531
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532 /* startup code has to be in near text rather
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533 than fartext as allocated by the C compiler. */
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534 asm(" .text");
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535 asm(" .align 2");
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536 asm(" .globl __start");
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537 asm(" .text");
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538 asm("__start:");
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539 /* setup base register b1 (function base). */
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540 asm(" .using b1,.");
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541 asm(" tpcbr b1");
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542 /* setup base registers b3 through b7 (data references). */
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543 asm(" file basevals,b3");
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544 /* setup base register b2 (stack pointer); it should be
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545 aligned on a 8-word boundary; but because it is pointing
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546 to argc, its value should be remembered (in r5). */
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547 asm(" movw b2,r4");
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548 asm(" movw b2,r5");
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549 asm(" andw #~0x1f,r4");
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550 asm(" movw r4,b2");
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551 /* allocate stack frame to do some work. */
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552 asm(" subea 16w,b2");
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553 /* initialize signal catching for UTX/32 1.2; this is
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554 necessary to make restart from saved image work. */
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555 asm(" movea sigcatch,r1");
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556 asm(" movw r1,8w[b2]");
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557 asm(" svc #1,#150");
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558 /* setup address of argc for start1. */
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559 asm(" movw r5,8w[b2]");
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560 asm(" func #1,_start1");
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561 asm(" halt");
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562 /* space for ld to store base register initial values. */
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563 asm(" .align 5");
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564 asm("basevals:");
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565 asm(" .word __base3,__base4,__base5,__base6,__base7");
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566
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567 static
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568 start1 (xargc)
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569 int *xargc;
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570 {
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571 int argc;
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572 char **argv;
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573
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574 argc = *xargc;
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575 argv = (char **)(xargc) + 1;
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576 environ = argv + argc + 1;
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577
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578 if (environ == argv)
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579 environ--;
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580 exit (main (argc, argv, environ));
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581
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582 }
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583
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584 #endif /* GOULD */
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585
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586 #ifdef elxsi
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587 #include <elxsi/argvcache.h>
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588
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589 extern char **environ;
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590 extern int errno;
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591 extern void _init_doscan(), _init_iob();
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592 extern char end[];
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593 char *_init_brk = end;
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594
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595 _start()
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596 {
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597 environ = exec_cache.ac_envp;
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598 brk (_init_brk);
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599 errno = 0;
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600 _init_doscan ();
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601 _init_iob ();
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602 _exit (exit (main (exec_cache.ac_argc,
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603 exec_cache.ac_argv,
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604 exec_cache.ac_envp)));
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605 }
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606 #endif /* elxsi */
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607
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608
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609 #ifdef sparc
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610 #ifdef no_toplevel_asm
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611 static no_toplevel_asm_wrapper() {
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612 #ifdef USG5_4
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613 asm (".pushsection \".text\"");
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614 #endif /* USG5_4 */
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615 #endif /* no_toplevel_asm */
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616 #ifdef USG5_4
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617 asm (".global _start");
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618 asm (".text");
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619 asm ("_start:");
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620 asm (" mov 0, %fp");
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621 asm (" ld [%sp + 64], %o0");
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622 asm (" add %sp, 68, %o1");
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623 asm (" sll %o0, 2, %o2");
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624 asm (" add %o2, 4, %o2");
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625 asm (" add %o1, %o2, %o2");
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626 asm (" sethi %hi(_environ), %o3");
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627 asm (" st %o2, [%o3+%lo(_environ)]");
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628 asm (" andn %sp, 7, %sp");
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629 asm (" call main");
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630 asm (" sub %sp, 24, %sp");
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631 asm (" call _exit");
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632 asm (" nop");
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633 #else
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634 asm (".global __start");
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635 asm (".text");
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636 asm ("__start:");
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637 asm (" mov 0, %fp");
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638 asm (" ld [%sp + 64], %o0");
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639 asm (" add %sp, 68, %o1");
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640 asm (" sll %o0, 2, %o2");
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|
641 asm (" add %o2, 4, %o2");
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642 asm (" add %o1, %o2, %o2");
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643 asm (" sethi %hi(_environ), %o3");
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644 asm (" st %o2, [%o3+%lo(_environ)]");
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|
645 asm (" andn %sp, 7, %sp");
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646 asm (" call _main");
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647 asm (" sub %sp, 24, %sp");
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648 asm (" call __exit");
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649 asm (" nop");
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650 #endif /* USG5_4 */
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|
651 #ifdef no_toplevel_asm
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652 #ifdef USG5_4
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653 asm (".popsection");
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654 #endif /* USG5_4 */
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655 } /* no_toplevel_asm_wrapper() */
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|
656 #endif /* no_toplevel_asm */
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657 #endif /* sparc */
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658
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659 #if __FreeBSD__ == 2
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|
660 char *__progname;
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661 #endif
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662 #ifdef __bsdi__
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|
663 #include <sys/param.h> /* for version number */
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|
664 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501)
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|
|
665 char *__progname;
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|
666 #endif
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667 #endif /* __bsdi__ */
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