Mercurial > hg > xemacs-beta
annotate src/ecrt0.c @ 5781:0853e1ec8529
Use alloca_{rawbytes,ibytes} in #'copy-file, #'insert-file-contents-internal
src/ChangeLog addition:
2014-01-20 Aidan Kehoe <kehoea@parhasard.net>
* fileio.c (Fcopy_file, Finsert_file_contents_internal):
Use alloca_{rawbytes,ibytes} here instead of the implicit alloca
on the stack; doesn't change where the buffers are allocated for
these two functions, but does mean that decisions about alloca
vs. malloc based on buffer size are made in the same place
(ultimately, the ALLOCA() macro).
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Mon, 20 Jan 2014 17:53:07 +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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8 Free Software Foundation, either version 3 of the License, or (at your |
|
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Mats Lidell <matsl@xemacs.org>
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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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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__ */ |