| 1 | /* C code startup routine. |
| 2 | Copyright (C) 1985, 1986, 1992, 2001, 2002, 2003, 2004, |
| 3 | 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | |
| 23 | /* The standard Vax 4.2 Unix crt0.c cannot be used for Emacs |
| 24 | because it makes `environ' an initialized variable. |
| 25 | It is easiest to have a special crt0.c on all machines |
| 26 | though I don't know whether other machines actually need it. */ |
| 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 | /* ******** WARNING ******** |
| 56 | Do not insert any data definitions before data_start! |
| 57 | Since this is the first file linked, the address of the following |
| 58 | variable should correspond to the start of initialized data space. |
| 59 | On some systems this is a constant that is independent of the text |
| 60 | size for shared executables. On others, it is a function of the |
| 61 | text size. In short, this seems to be the most portable way to |
| 62 | discover the start of initialized data space dynamically at runtime, |
| 63 | for either shared or unshared executables, on either swapping or |
| 64 | virtual systems. It only requires that the linker allocate objects |
| 65 | in the order encountered, a reasonable model for most Unix systems. |
| 66 | Similarly, note that the address of _start() should be the start |
| 67 | of text space. Fred Fish, UniSoft Systems Inc. */ |
| 68 | |
| 69 | int data_start = 0; |
| 70 | |
| 71 | #ifdef NEED_ERRNO |
| 72 | int errno; |
| 73 | #endif |
| 74 | |
| 75 | #ifndef MSDOS |
| 76 | char **environ; |
| 77 | #endif |
| 78 | |
| 79 | #ifndef static |
| 80 | /* On systems where the static storage class is usable, this function |
| 81 | should be declared as static. Otherwise, the static keyword has |
| 82 | been defined to be something else, and code for those systems must |
| 83 | take care of this declaration appropriately. */ |
| 84 | static start1 (); |
| 85 | #endif |
| 86 | |
| 87 | #ifdef CRT0_DUMMIES |
| 88 | |
| 89 | /* Define symbol "start": here; some systems want that symbol. */ |
| 90 | #ifdef DOT_GLOBAL_START |
| 91 | asm(" .text "); |
| 92 | asm(" .globl start "); |
| 93 | asm(" start: "); |
| 94 | #endif /* DOT_GLOBAL_START */ |
| 95 | |
| 96 | #ifdef NODOT_GLOBAL_START |
| 97 | asm(" text "); |
| 98 | asm(" global start "); |
| 99 | asm(" start: "); |
| 100 | #endif /* NODOT_GLOBAL_START */ |
| 101 | |
| 102 | #ifdef m68000 |
| 103 | |
| 104 | /* GCC 2.1, when optimization is turned off, seems to want to push a |
| 105 | word of garbage on the stack, which screws up the CRT0_DUMMIES |
| 106 | hack. So we hand-code _start in assembly language. */ |
| 107 | asm(".text "); |
| 108 | asm(" .even "); |
| 109 | asm(".globl __start "); |
| 110 | asm("__start: "); |
| 111 | asm(" link a6,#0 "); |
| 112 | asm(" jbsr _start1 "); |
| 113 | asm(" unlk a6 "); |
| 114 | asm(" rts "); |
| 115 | |
| 116 | #else /* not m68000 */ |
| 117 | |
| 118 | _start () |
| 119 | { |
| 120 | /* On vax, nothing is pushed here */ |
| 121 | /* On sequent, bogus fp is pushed here */ |
| 122 | start1 (); |
| 123 | } |
| 124 | |
| 125 | #endif /* possibly m68000 */ |
| 126 | |
| 127 | static |
| 128 | start1 (CRT0_DUMMIES argc, xargv) |
| 129 | int argc; |
| 130 | char *xargv; |
| 131 | { |
| 132 | register char **argv = &xargv; |
| 133 | environ = argv + argc + 1; |
| 134 | |
| 135 | if ((char *)environ == xargv) |
| 136 | environ--; |
| 137 | exit (main (argc, argv, environ)); |
| 138 | |
| 139 | /* Refer to `start1' so GCC will not think it is never called |
| 140 | and optimize it out. */ |
| 141 | (void) &start1; |
| 142 | } |
| 143 | #else /* not CRT0_DUMMIES */ |
| 144 | |
| 145 | /* "m68k" and "m68000" both stand for m68000 processors, |
| 146 | but with different program-entry conventions. |
| 147 | This is a kludge. Now that the CRT0_DUMMIES mechanism above exists, |
| 148 | most of these machines could use the vax code above |
| 149 | with some suitable definition of CRT0_DUMMIES. |
| 150 | Then the symbol m68k could be flushed. |
| 151 | But I don't want to risk breaking these machines |
| 152 | in a version 17 patch release, so that change is being put off. */ |
| 153 | |
| 154 | #ifdef m68k /* Can't do it all from C */ |
| 155 | asm (" global _start"); |
| 156 | asm (" text"); |
| 157 | asm ("_start:"); |
| 158 | asm (" comm splimit%,4"); |
| 159 | asm (" global exit"); |
| 160 | asm (" text"); |
| 161 | asm (" mov.l %d0,splimit%"); |
| 162 | asm (" jsr start1"); |
| 163 | asm (" mov.l %d0,(%sp)"); |
| 164 | asm (" jsr exit"); |
| 165 | asm (" mov.l &1,%d0"); /* d0 = 1 => exit */ |
| 166 | asm (" trap &0"); |
| 167 | #else /* m68000, not m68k */ |
| 168 | |
| 169 | #ifdef m68000 |
| 170 | |
| 171 | _start () |
| 172 | { |
| 173 | #ifdef sun |
| 174 | finitfp_(); |
| 175 | #endif |
| 176 | /* On 68000, _start pushes a6 onto stack */ |
| 177 | start1 (); |
| 178 | } |
| 179 | #endif /* m68000 */ |
| 180 | #endif /* m68k */ |
| 181 | |
| 182 | #if defined(m68k) || defined(m68000) |
| 183 | /* ignore takes care of skipping the a6 value pushed in start. */ |
| 184 | static |
| 185 | #if defined(m68k) |
| 186 | start1 (argc, xargv) |
| 187 | #else |
| 188 | start1 (ignore, argc, xargv) |
| 189 | #endif |
| 190 | int argc; |
| 191 | char *xargv; |
| 192 | { |
| 193 | register char **argv = &xargv; |
| 194 | environ = argv + argc + 1; |
| 195 | |
| 196 | if ((char *)environ == xargv) |
| 197 | environ--; |
| 198 | exit (main (argc, argv, environ)); |
| 199 | } |
| 200 | |
| 201 | #endif /* m68k or m68000 */ |
| 202 | |
| 203 | #endif /* not CRT0_DUMMIES */ |
| 204 | |
| 205 | #ifdef hp9000s300 |
| 206 | int argc_value; |
| 207 | char **argv_value; |
| 208 | #ifdef OLD_HP_ASSEMBLER |
| 209 | asm(" text"); |
| 210 | asm(" globl __start"); |
| 211 | asm(" globl _exit"); |
| 212 | asm(" globl _main"); |
| 213 | asm("__start"); |
| 214 | asm(" dc.l 0"); |
| 215 | asm(" subq.w #0x1,d0"); |
| 216 | asm(" move.w d0,float_soft"); |
| 217 | asm(" move.l 0x4(a7),d0"); |
| 218 | asm(" beq.s skip_1"); |
| 219 | asm(" move.l d0,a0"); |
| 220 | asm(" clr.l -0x4(a0)"); |
| 221 | asm("skip_1"); |
| 222 | asm(" move.l a7,a0"); |
| 223 | asm(" subq.l #0x8,a7"); |
| 224 | asm(" move.l (a0),(a7)"); |
| 225 | asm(" move.l (a0),_argc_value"); |
| 226 | asm(" addq.l #0x4,a0"); |
| 227 | asm(" move.l a0,0x4(a7)"); |
| 228 | asm(" move.l a0,_argv_value"); |
| 229 | asm("incr_loop"); |
| 230 | asm(" tst.l (a0)+"); |
| 231 | asm(" bne.s incr_loop"); |
| 232 | asm(" move.l 0x4(a7),a1"); |
| 233 | asm(" cmp.l (a1),a0"); |
| 234 | asm(" blt.s skip_2"); |
| 235 | asm(" subq.l #0x4,a0"); |
| 236 | asm("skip_2"); |
| 237 | asm(" move.l a0,0x8(a7)"); |
| 238 | asm(" move.l a0,_environ"); |
| 239 | asm(" jsr _main"); |
| 240 | asm(" addq.l #0x8,a7"); |
| 241 | asm(" move.l d0,-(a7)"); |
| 242 | asm(" jsr _exit"); |
| 243 | asm(" move.w #0x1,d0"); |
| 244 | asm(" trap #0x0"); |
| 245 | asm(" comm float_soft,4"); |
| 246 | /* float_soft is allocated in this way because C would |
| 247 | put an underscore character in its name otherwise. */ |
| 248 | |
| 249 | #else /* new hp assembler */ |
| 250 | |
| 251 | asm(" text"); |
| 252 | asm(" global float_loc"); |
| 253 | asm(" set float_loc,0xFFFFB000"); |
| 254 | asm(" global fpa_loc"); |
| 255 | asm(" set fpa_loc,0xfff08000"); |
| 256 | asm(" global __start"); |
| 257 | asm(" global _exit"); |
| 258 | asm(" global _main"); |
| 259 | asm("__start:"); |
| 260 | asm(" byte 0,0,0,0"); |
| 261 | asm(" subq.w &1,%d0"); |
| 262 | asm(" mov.w %d0,float_soft"); |
| 263 | asm(" mov.w %d1,flag_68881"); |
| 264 | #ifndef HPUX_68010 |
| 265 | asm(" beq.b skip_float"); |
| 266 | asm(" fmov.l &0x7400,%fpcr"); |
| 267 | /* asm(" fmov.l &0x7480,%fpcr"); */ |
| 268 | #endif /* HPUX_68010 */ |
| 269 | asm("skip_float:"); |
| 270 | asm(" mov.l %a0,%d0"); |
| 271 | asm(" add.l %d0,%d0"); |
| 272 | asm(" subx.w %d1,%d1"); |
| 273 | asm(" mov.w %d1,flag_68010"); |
| 274 | asm(" add.l %d0,%d0"); |
| 275 | asm(" subx.w %d1,%d1"); |
| 276 | asm(" mov.w %d1,flag_fpa"); |
| 277 | asm(" tst.l %d2"); |
| 278 | asm(" ble.b skip_3"); |
| 279 | asm(" lsl flag_68881"); |
| 280 | asm(" lsl flag_fpa"); |
| 281 | asm("skip_3:"); |
| 282 | asm(" mov.l 4(%a7),%d0"); |
| 283 | asm(" beq.b skip_1"); |
| 284 | asm(" mov.l %d0,%a0"); |
| 285 | asm(" clr.l -4(%a0)"); |
| 286 | asm("skip_1:"); |
| 287 | asm(" mov.l %a7,%a0"); |
| 288 | asm(" subq.l &8,%a7"); |
| 289 | asm(" mov.l (%a0),(%a7)"); |
| 290 | asm(" mov.l (%a0),_argc_value"); |
| 291 | asm(" addq.l &4,%a0"); |
| 292 | asm(" mov.l %a0,4(%a7)"); |
| 293 | asm(" mov.l %a0,_argv_value"); |
| 294 | asm("incr_loop:"); |
| 295 | asm(" tst.l (%a0)+"); |
| 296 | asm(" bne.b incr_loop"); |
| 297 | asm(" mov.l 4(%a7),%a1"); |
| 298 | asm(" cmp.l %a0,(%a1)"); |
| 299 | asm(" blt.b skip_2"); |
| 300 | asm(" subq.l &4,%a0"); |
| 301 | asm("skip_2:"); |
| 302 | asm(" mov.l %a0,8(%a7)"); |
| 303 | asm(" mov.l %a0,_environ"); |
| 304 | asm(" jsr _main"); |
| 305 | asm(" addq.l &8,%a7"); |
| 306 | asm(" mov.l %d0,-(%a7)"); |
| 307 | asm(" jsr _exit"); |
| 308 | asm(" mov.w &1,%d0"); |
| 309 | asm(" trap &0"); |
| 310 | asm(" comm float_soft, 4"); |
| 311 | asm(" comm flag_68881, 4"); |
| 312 | asm(" comm flag_68010, 4"); |
| 313 | asm(" comm flag_68040, 4"); |
| 314 | asm(" comm flag_fpa, 4"); |
| 315 | |
| 316 | #endif /* new hp assembler */ |
| 317 | #endif /* hp9000s300 */ |
| 318 | |
| 319 | #ifdef sparc |
| 320 | asm (".global __start"); |
| 321 | asm (".text"); |
| 322 | asm ("__start:"); |
| 323 | asm (" mov 0, %fp"); |
| 324 | asm (" ld [%sp + 64], %o0"); |
| 325 | asm (" add %sp, 68, %o1"); |
| 326 | asm (" sll %o0, 2, %o2"); |
| 327 | asm (" add %o2, 4, %o2"); |
| 328 | asm (" add %o1, %o2, %o2"); |
| 329 | asm (" sethi %hi(_environ), %o3"); |
| 330 | asm (" st %o2, [%o3+%lo(_environ)]"); |
| 331 | asm (" andn %sp, 7, %sp"); |
| 332 | asm (" call _main"); |
| 333 | asm (" sub %sp, 24, %sp"); |
| 334 | asm (" call __exit"); |
| 335 | asm (" nop"); |
| 336 | |
| 337 | #endif /* sparc */ |
| 338 | |
| 339 | #if __FreeBSD__ == 2 |
| 340 | char *__progname; |
| 341 | #endif |
| 342 | #ifdef __bsdi__ |
| 343 | #include <sys/param.h> /* for version number */ |
| 344 | #if defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199501) |
| 345 | char *__progname; |
| 346 | #endif |
| 347 | #endif /* __bsdi__ */ |
| 348 | |
| 349 | /* arch-tag: 4025c2fb-d6b1-4d29-b1b6-8100b6bd1e74 |
| 350 | (do not change this comment) */ |