Mercurial > hg > xemacs-beta
annotate src/ecrt0.c @ 5940:c608d4b0b75e cygwin64 tip
rescue lost branch from 64bit.backup
| author | Henry Thompson <ht@markup.co.uk> |
|---|---|
| date | Thu, 16 Dec 2021 18:48:58 +0000 |
| parents | 308d34e9f07d |
| children |
| rev | line source |
|---|---|
| 428 | 1 /* C code startup routine. |
| 2 Copyright (C) 1985, 1986, 1992, 1993 Free Software Foundation, Inc. | |
| 3 | |
| 4 This file is part of XEmacs. | |
| 5 | |
|
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6 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 7 under the terms of the GNU General Public License as published by the |
|
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Mats Lidell <matsl@xemacs.org>
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changeset
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8 Free Software Foundation, either version 3 of the License, or (at your |
|
308d34e9f07d
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Mats Lidell <matsl@xemacs.org>
parents:
4759
diff
changeset
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9 option) any later version. |
| 428 | 10 |
| 11 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
|
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Mats Lidell <matsl@xemacs.org>
parents:
4759
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changeset
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17 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 18 |
| 19 /* Synched up with: FSF 19.30. */ | |
| 20 | |
| 21 | |
| 771 | 22 /* [[The standard Vax 4.2 Unix crt0.c cannot be used for Emacs |
| 428 | 23 because it makes `environ' an initialized variable. |
| 24 It is easiest to have a special crt0.c on all machines | |
| 771 | 25 though I don't know whether other machines actually need it.]] |
| 26 This is insane! We DO NOT want to be doing this crap. */ | |
| 428 | 27 |
| 28 /* On the vax and 68000, in BSD4.2 and USG5.2, | |
| 29 this is the data format on startup: | |
| 30 (vax) ap and fp are unpredictable as far as I know; don't use them. | |
| 31 sp -> word containing argc | |
| 32 word pointing to first arg string | |
| 33 [word pointing to next arg string]... 0 or more times | |
| 34 0 | |
| 35 Optionally: | |
| 36 [word pointing to environment variable]... 1 or more times | |
| 37 ... | |
| 38 0 | |
| 39 And always: | |
| 40 first arg string | |
| 41 [next arg string]... 0 or more times | |
| 42 */ | |
| 43 | |
| 44 /* On the 16000, at least in the one 4.2 system I know about, | |
| 45 the initial data format is | |
| 46 sp -> word containing argc | |
| 47 word containing argp | |
| 48 word pointing to first arg string, and so on as above | |
| 49 */ | |
| 50 | |
| 51 #ifdef emacs | |
| 52 #include <config.h> | |
| 53 #endif | |
| 54 | |
| 55 #ifdef __GNUC__ | |
| 56 #define asm __asm | |
| 57 #endif | |
| 58 | |
| 59 /* Workaround for Sun cc 3.0, which doesn't handle asm's outside a fn. */ | |
| 60 #if __SUNPRO_C >= 0x300 | |
| 61 #define no_toplevel_asm | |
| 62 #endif | |
| 63 | |
| 64 /* ******** WARNING ******** | |
| 65 Do not insert any data definitions before data_start! | |
| 66 Since this is the first file linked, the address of the following | |
| 67 variable should correspond to the start of initialized data space. | |
| 68 On some systems this is a constant that is independent of the text | |
| 69 size for shared executables. On others, it is a function of the | |
| 70 text size. In short, this seems to be the most portable way to | |
| 71 discover the start of initialized data space dynamically at runtime, | |
| 72 for either shared or unshared executables, on either swapping or | |
| 73 virtual systems. It only requires that the linker allocate objects | |
| 74 in the order encountered, a reasonable model for most Unix systems. | |
| 75 Similarly, note that the address of _start() should be the start | |
| 76 of text space. Fred Fish, UniSoft Systems Inc. */ | |
| 77 | |
| 78 int data_start = 0; | |
| 79 | |
| 80 #ifdef NEED_ERRNO | |
| 81 int errno; | |
| 82 #endif | |
| 83 | |
| 84 char **environ; | |
| 85 | |
| 86 #ifndef static | |
| 87 /* On systems where the static storage class is usable, this function | |
| 88 should be declared as static. Otherwise, the static keyword has | |
| 89 been defined to be something else, and code for those systems must | |
| 90 take care of this declaration appropriately. */ | |
| 91 static start1 (); | |
| 92 #endif | |
| 93 | |
| 94 #ifdef CRT0_DUMMIES | |
| 95 | |
| 96 /* Define symbol "start": here; some systems want that symbol. */ | |
| 97 #ifdef DOT_GLOBAL_START | |
| 98 asm(" .text "); | |
| 99 asm(" .globl start "); | |
| 100 asm(" start: "); | |
| 101 #endif /* DOT_GLOBAL_START */ | |
| 102 | |
| 103 #ifdef NODOT_GLOBAL_START | |
| 104 asm(" text "); | |
| 105 asm(" global start "); | |
| 106 asm(" start: "); | |
| 107 #endif /* NODOT_GLOBAL_START */ | |
| 108 | |
| 109 #ifdef m68000 | |
| 110 | |
| 111 /* GCC 2.1, when optimization is turned off, seems to want to push a | |
| 112 word of garbage on the stack, which screws up the CRT0_DUMMIES | |
| 113 hack. So we hand-code _start in assembly language. */ | |
| 114 asm(".text "); | |
| 115 #ifndef sony_news | |
| 116 asm(" .even "); | |
| 117 #else /* sony_news (not gas) */ | |
| 118 + asm(" .align 2 "); | |
| 119 #endif /* sony_news (not gas) */ | |
| 120 asm(".globl __start "); | |
| 121 asm("__start: "); | |
| 122 asm(" link a6,#0 "); | |
| 123 asm(" jbsr _start1 "); | |
| 124 asm(" unlk a6 "); | |
| 125 asm(" rts "); | |
| 126 | |
| 127 #else /* not m68000 */ | |
| 128 | |
| 129 int | |
| 130 _start () | |
| 131 { | |
| 132 start1 (); | |
| 133 } | |
| 134 | |
| 135 #endif /* possibly m68000 */ | |
| 136 | |
| 137 #ifdef __bsdi__ /* for version number */ | |
| 138 #include <sys/param.h> | |
| 139 #endif | |
| 140 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501) | |
| 141 char *__progname; | |
| 142 #endif | |
| 143 static int | |
| 144 start1 (CRT0_DUMMIES int argc, char *xargv) | |
| 145 { | |
| 146 char **argv = &xargv; | |
| 147 environ = argv + argc + 1; | |
| 148 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501) | |
| 149 __progname = argv[0]; | |
| 150 #endif | |
| 151 | |
| 152 if ((char *)environ == xargv) | |
| 153 environ--; | |
| 154 exit (main (argc, argv, environ)); | |
| 155 | |
| 156 /* Refer to `start1' so GCC will not think it is never called | |
| 157 and optimize it out. */ | |
| 158 (void) &start1; | |
| 159 } | |
| 160 #else /* not CRT0_DUMMIES */ | |
| 161 | |
| 162 /* "m68k" and "m68000" both stand for m68000 processors, | |
| 163 but with different program-entry conventions. | |
| 164 This is a kludge. Now that the CRT0_DUMMIES mechanism above exists, | |
| 165 most of these machines could use the vax code above | |
| 166 with some suitable definition of CRT0_DUMMIES. | |
| 167 Then the symbol m68k could be flushed. | |
| 168 But I don't want to risk breaking these machines | |
| 169 in a version 17 patch release, so that change is being put off. */ | |
| 170 | |
| 171 #ifdef m68k /* Can't do it all from C */ | |
| 172 asm (" global _start"); | |
| 173 asm (" text"); | |
| 174 asm ("_start:"); | |
| 175 #ifndef NU | |
| 176 #ifdef STRIDE | |
| 177 asm (" comm havefpu%,2"); | |
| 178 #else /* m68k, not STRIDE */ | |
| 179 asm (" comm splimit%,4"); | |
| 180 #endif /* STRIDE */ | |
| 181 asm (" global exit"); | |
| 182 asm (" text"); | |
| 183 #ifdef STRIDE | |
| 184 asm (" trap &3"); | |
| 185 asm (" mov.w %d0,havefpu%"); | |
| 186 #else /* m68k, not STRIDE */ | |
| 187 asm (" mov.l %d0,splimit%"); | |
| 188 #endif /* STRIDE */ | |
| 189 #endif /* not NU */ | |
| 190 asm (" jsr start1"); | |
| 191 asm (" mov.l %d0,(%sp)"); | |
| 192 asm (" jsr exit"); | |
| 193 asm (" mov.l &1,%d0"); /* d0 = 1 => exit */ | |
| 194 asm (" trap &0"); | |
| 195 #else /* m68000, not m68k */ | |
| 196 | |
| 197 #ifdef m68000 | |
| 198 _start () | |
| 199 { | |
| 200 #ifdef sun | |
| 201 finitfp_(); | |
| 202 #endif | |
| 203 /* On 68000, _start pushes a6 onto stack */ | |
| 204 start1 (); | |
| 205 } | |
| 206 #endif /* m68000 */ | |
| 207 #endif /* m68k */ | |
| 208 | |
| 209 #if defined(m68k) || defined(m68000) | |
| 210 /* ignore takes care of skipping the a6 value pushed in start. */ | |
| 211 static | |
| 212 #if defined(m68k) | |
| 213 start1 (argc, xargv) | |
| 214 #else | |
| 215 start1 (ignore, argc, xargv) | |
| 216 #endif | |
| 217 int argc; | |
| 218 char *xargv; | |
| 219 { | |
| 220 char **argv = &xargv; | |
| 221 environ = argv + argc + 1; | |
| 222 | |
| 223 if ((char *)environ == xargv) | |
| 224 environ--; | |
| 225 #ifdef sun_68881 | |
| 226 asm(" jsr f68881_used"); | |
| 227 #endif | |
| 228 #ifdef sun_fpa | |
| 229 asm(" jsr ffpa_used"); | |
| 230 #endif | |
| 231 #ifdef sun_soft | |
| 232 asm(" jsr start_float"); | |
| 233 #endif | |
| 234 exit (main (argc, argv, environ)); | |
| 235 } | |
| 236 | |
| 237 #endif /* m68k or m68000 */ | |
| 238 | |
| 239 #endif /* not CRT0_DUMMIES */ | |
| 240 | |
| 241 #ifdef sparc | |
| 242 #ifdef no_toplevel_asm | |
| 243 static no_toplevel_asm_wrapper() { | |
| 244 #ifdef USG5_4 | |
| 245 asm (".pushsection \".text\""); | |
| 246 #endif /* USG5_4 */ | |
| 247 #endif /* no_toplevel_asm */ | |
| 248 #ifdef USG5_4 | |
| 249 asm (".global _start"); | |
| 250 asm (".text"); | |
| 251 asm ("_start:"); | |
| 252 asm (" mov 0, %fp"); | |
| 253 asm (" ld [%sp + 64], %o0"); | |
| 254 asm (" add %sp, 68, %o1"); | |
| 255 asm (" sll %o0, 2, %o2"); | |
| 256 asm (" add %o2, 4, %o2"); | |
| 257 asm (" add %o1, %o2, %o2"); | |
| 258 asm (" sethi %hi(_environ), %o3"); | |
| 259 asm (" st %o2, [%o3+%lo(_environ)]"); | |
| 260 asm (" andn %sp, 7, %sp"); | |
| 261 asm (" call main"); | |
| 262 asm (" sub %sp, 24, %sp"); | |
| 263 asm (" call _exit"); | |
| 264 asm (" nop"); | |
| 265 #else | |
| 266 asm (".global __start"); | |
| 267 asm (".text"); | |
| 268 asm ("__start:"); | |
| 269 asm (" mov 0, %fp"); | |
| 270 asm (" ld [%sp + 64], %o0"); | |
| 271 asm (" add %sp, 68, %o1"); | |
| 272 asm (" sll %o0, 2, %o2"); | |
| 273 asm (" add %o2, 4, %o2"); | |
| 274 asm (" add %o1, %o2, %o2"); | |
| 275 asm (" sethi %hi(_environ), %o3"); | |
| 276 asm (" st %o2, [%o3+%lo(_environ)]"); | |
| 277 asm (" andn %sp, 7, %sp"); | |
| 278 asm (" call _main"); | |
| 279 asm (" sub %sp, 24, %sp"); | |
| 280 asm (" call __exit"); | |
| 281 asm (" nop"); | |
| 282 #endif /* USG5_4 */ | |
| 283 #ifdef no_toplevel_asm | |
| 284 #ifdef USG5_4 | |
| 285 asm (".popsection"); | |
| 286 #endif /* USG5_4 */ | |
| 287 } /* no_toplevel_asm_wrapper() */ | |
| 288 #endif /* no_toplevel_asm */ | |
| 289 #endif /* sparc */ | |
| 290 | |
| 291 #if __FreeBSD__ == 2 | |
| 292 char *__progname; | |
| 293 #endif | |
| 294 #ifdef __bsdi__ | |
| 295 #include <sys/param.h> /* for version number */ | |
| 296 #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501) | |
| 297 char *__progname; | |
| 298 #endif | |
| 299 #endif /* __bsdi__ */ |