Mercurial > hg > xemacs-beta
annotate src/unexhp9k800.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 | 90dcf2376909 |
| children |
| rev | line source |
|---|---|
| 428 | 1 /* Unexec for HP 9000 Series 800 machines. |
|
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Last minute notice fixups.
Stephen J. Turnbull <stephen@xemacs.org>
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2 |
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Stephen J. Turnbull <stephen@xemacs.org>
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3 Copyright 1996 Bob Desinger <hpsemc!bd@hplabs.hp.com> |
| 428 | 4 |
| 5 This file is part of XEmacs. | |
| 6 | |
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7 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation, either version 3 of the License, or (at your |
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10 option) any later version. |
| 428 | 11 |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
|
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18 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 19 |
| 20 /* Synched up with: Not synched with FSF. */ | |
| 21 | |
| 22 /* | |
| 23 | |
| 24 Unexec creates a copy of the old a.out file, and replaces the old data | |
| 25 area with the current data area. When the new file is executed, the | |
| 26 process will see the same data structures and data values that the | |
| 27 original process had when unexec was called. | |
| 28 | |
| 29 Unlike other versions of unexec, this one copies symbol table and | |
| 30 debug information to the new a.out file. Thus, the new a.out file | |
| 31 may be debugged with symbolic debuggers. | |
| 32 | |
| 33 If you fix any bugs in this, I'd like to incorporate your fixes. | |
| 34 Send them to uunet!hpda!hpsemc!jmorris or jmorris%hpsemc@hplabs.HP.COM. | |
| 35 | |
| 36 CAVEATS: | |
| 37 This routine saves the current value of all static and external | |
| 38 variables. This means that any data structure that needs to be | |
| 39 initialized must be explicitly reset. Variables will not have their | |
| 40 expected default values. | |
| 41 | |
| 42 Unfortunately, the HP-UX signal handler has internal initialization | |
| 43 flags which are not explicitly reset. Thus, for signals to work in | |
| 44 conjunction with this routine, the following code must executed when | |
| 45 the new process starts up. | |
| 46 | |
| 47 void _sigreturn(); | |
| 48 ... | |
| 49 sigsetreturn(_sigreturn); | |
| 50 */ | |
| 51 | |
| 52 | |
| 53 #include <config.h> | |
| 430 | 54 #include <stdlib.h> |
| 428 | 55 #include <stdio.h> |
| 56 #include <fcntl.h> | |
| 57 #include <errno.h> | |
| 58 | |
| 59 #include <a.out.h> | |
| 442 | 60 #include "lisp.h" |
| 428 | 61 |
| 62 /* | |
| 63 * Minor modification to enable dumping with shared libraries added by | |
| 64 * Dipankar Gupta (dg@hplb.hpl.hp.com). I studied Oliver Laumann's | |
| 65 * more elaborate dynamic loading scheme in ELK while implementing | |
| 66 * this, but don't use any of his machinery. | |
| 67 * | |
| 68 * Stores the BRK value at dump time, and uses the RUN_TIME_REMAP hook | |
| 69 * to break back to the stored value when the dumped executable is restarted. | |
| 70 * | |
| 71 * CAVEATS (addenda): | |
| 72 * 1. Text area of the shlibs are not stored. Thus, if a shared library is | |
| 73 * replaced between the time of dump and execution, all bets are off. | |
| 74 * | |
| 75 * 2. Assumes that the data and bss area are adjacent, which is true of the | |
| 76 * current VM implementation. | |
| 77 * | |
| 78 * 3. Any setup that defines HPUX_USE_SHLIBS *must* also define | |
| 79 * RUN_TIME_REMAP. | |
| 80 */ | |
| 81 | |
| 82 #ifdef HPUX_USE_SHLIBS | |
| 83 #include <dl.h> /* User-space dynamic loader entry points */ | |
| 442 | 84 static void Save_Shared_Data (void); |
| 85 static void Restore_Shared_Data (void); | |
| 428 | 86 #endif |
| 87 | |
| 88 void write_header(int file, struct header *hdr, struct som_exec_auxhdr *auxhdr); | |
| 89 void read_header (int file, struct header *hdr, struct som_exec_auxhdr *auxhdr); | |
| 90 void save_data_space (int file, struct header *hdr, | |
| 91 struct som_exec_auxhdr *auxhdr, int size); | |
| 3025 | 92 void copy_rest (int old, int new_); |
| 93 void copy_file (int old, int new_, int size); | |
| 428 | 94 void update_file_ptrs(int file, struct header *hdr, |
| 95 struct som_exec_auxhdr *auxhdr, | |
| 96 unsigned int location, int offset); | |
| 97 int calculate_checksum(struct header *hdr); | |
| 98 | |
| 99 /* Create a new a.out file, same as old but with current data space */ | |
| 100 int | |
| 442 | 101 unexec (char *new_name, /* name of the new a.out file to be created */ |
| 102 char *old_name, /* name of the old a.out file */ | |
| 2286 | 103 uintptr_t UNUSED (new_end_of_text), /* ptr to new edata/etext */ |
| 104 uintptr_t UNUSED (dummy1), /* not used by emacs */ | |
| 105 uintptr_t UNUSED (dummy2)) | |
| 428 | 106 { |
| 3025 | 107 int old, new_; |
| 428 | 108 int old_size, new_size; |
| 109 struct header hdr; | |
| 110 struct som_exec_auxhdr auxhdr; | |
| 111 long i; | |
| 112 | |
| 113 /* For the greatest flexibility, should create a temporary file in | |
| 114 the same directory as the new file. When everything is complete, | |
| 115 rename the temp file to the new name. | |
| 116 This way, a program could update its own a.out file even while | |
| 117 it is still executing. If problems occur, everything is still | |
| 118 intact. NOT implemented. */ | |
| 119 | |
| 120 /* Open the input and output a.out files */ | |
| 121 old = open (old_name, O_RDONLY); | |
| 122 if (old < 0) | |
| 123 { perror(old_name); exit(1); } | |
| 3025 | 124 new_ = open (new_name, O_CREAT|O_RDWR|O_TRUNC, 0777); |
| 125 if (new_ < 0) | |
| 428 | 126 { perror(new_name); exit(1); } |
| 127 | |
| 128 /* Read the old headers */ | |
| 129 read_header(old, &hdr, &auxhdr); | |
| 130 | |
| 131 #ifdef HPUX_USE_SHLIBS | |
| 132 Save_Shared_Data(); /* Save break value (added: dg@hplb.hpl.hp.com) */ | |
| 133 #endif | |
| 134 /* Decide how large the new and old data areas are */ | |
| 135 old_size = auxhdr.exec_dsize; | |
| 136 /* I suspect these two statements are separate | |
| 137 to avoid a compiler bug in hpux version 8. */ | |
| 138 i = (long) sbrk (0); | |
| 139 new_size = i - auxhdr.exec_dmem; | |
| 140 | |
| 141 /* Copy the old file to the new, up to the data space */ | |
| 142 lseek(old, 0, 0); | |
| 3025 | 143 copy_file(old, new_, auxhdr.exec_dfile); |
| 428 | 144 |
| 145 /* Skip the old data segment and write a new one */ | |
| 146 lseek(old, old_size, 1); | |
| 3025 | 147 save_data_space(new_, &hdr, &auxhdr, new_size); |
| 428 | 148 |
| 149 /* Copy the rest of the file */ | |
| 3025 | 150 copy_rest(old, new_); |
| 428 | 151 |
| 152 /* Update file pointers since we probably changed size of data area */ | |
| 3025 | 153 update_file_ptrs(new_, &hdr, &auxhdr, auxhdr.exec_dfile, new_size-old_size); |
| 428 | 154 |
| 155 /* Save the modified header */ | |
| 3025 | 156 write_header(new_, &hdr, &auxhdr); |
| 428 | 157 |
| 158 /* Close the binary file */ | |
| 159 close (old); | |
| 3025 | 160 close (new_); |
| 428 | 161 return 0; |
| 162 } | |
| 163 | |
| 164 /* Save current data space in the file, update header. */ | |
| 165 | |
| 166 void | |
| 2286 | 167 save_data_space (int file, struct header *UNUSED (hdr), |
| 428 | 168 struct som_exec_auxhdr *auxhdr, int size) |
| 169 { | |
| 170 /* Write the entire data space out to the file */ | |
| 171 if (write(file, (void *)auxhdr->exec_dmem, size) != size) | |
| 172 { perror("Can't save new data space"); exit(1); } | |
| 173 | |
| 174 /* Update the header to reflect the new data size */ | |
| 175 auxhdr->exec_dsize = size; | |
| 176 auxhdr->exec_bsize = 0; | |
| 177 } | |
| 178 | |
| 179 /* Update the values of file pointers when something is inserted. */ | |
| 180 | |
| 181 void | |
| 182 update_file_ptrs(int file, struct header *hdr, | |
| 183 struct som_exec_auxhdr *auxhdr, | |
| 184 unsigned int location, int offset) | |
| 185 { | |
| 186 struct subspace_dictionary_record subspace; | |
| 187 int i; | |
| 188 | |
| 189 /* Increase the overall size of the module */ | |
| 190 hdr->som_length += offset; | |
| 191 | |
| 192 /* Update the various file pointers in the header */ | |
| 193 #define update(ptr) if (ptr > location) ptr = ptr + offset | |
| 194 update(hdr->aux_header_location); | |
| 195 update(hdr->space_strings_location); | |
| 196 update(hdr->init_array_location); | |
| 197 update(hdr->compiler_location); | |
| 198 update(hdr->symbol_location); | |
| 199 update(hdr->fixup_request_location); | |
| 200 update(hdr->symbol_strings_location); | |
| 201 update(hdr->unloadable_sp_location); | |
| 202 update(auxhdr->exec_tfile); | |
| 203 update(auxhdr->exec_dfile); | |
| 204 | |
| 205 /* Do for each subspace dictionary entry */ | |
| 206 lseek(file, hdr->subspace_location, 0); | |
| 207 for (i = 0; i < hdr->subspace_total; i++) | |
| 208 { | |
| 209 if (read(file, &subspace, sizeof(subspace)) != sizeof(subspace)) | |
| 210 { perror("Can't read subspace record"); exit(1); } | |
| 211 | |
| 212 /* If subspace has a file location, update it */ | |
| 213 if (subspace.initialization_length > 0 | |
| 214 && subspace.file_loc_init_value > location) | |
| 215 { | |
| 216 subspace.file_loc_init_value += offset; | |
| 217 lseek(file, -sizeof(subspace), 1); | |
| 218 if (write(file, &subspace, sizeof(subspace)) != sizeof(subspace)) | |
| 219 { perror("Can't update subspace record"); exit(1); } | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 /* Do for each initialization pointer record */ | |
| 224 /* (I don't think it applies to executable files, only relocatables) */ | |
| 225 #undef update | |
| 226 } | |
| 227 | |
| 228 /* Read in the header records from an a.out file. */ | |
| 229 | |
| 230 void | |
| 231 read_header(int file, struct header *hdr, struct som_exec_auxhdr *auxhdr) | |
| 232 { | |
| 233 | |
| 234 /* Read the header in */ | |
| 235 lseek(file, 0, 0); | |
| 236 if (read(file, hdr, sizeof(*hdr)) != sizeof(*hdr)) | |
| 237 { perror("Couldn't read header from a.out file"); exit(1); } | |
| 238 | |
| 239 if (hdr->a_magic != EXEC_MAGIC && hdr->a_magic != SHARE_MAGIC | |
| 240 && hdr->a_magic != DEMAND_MAGIC) | |
| 241 { | |
| 242 fprintf(stderr, "a.out file doesn't have legal magic number\n"); | |
| 243 exit(1); | |
| 244 } | |
| 245 | |
| 246 lseek(file, hdr->aux_header_location, 0); | |
| 247 if (read(file, auxhdr, sizeof(*auxhdr)) != sizeof(*auxhdr)) | |
| 248 { | |
| 249 perror("Couldn't read auxiliary header from a.out file"); | |
| 250 exit(1); | |
| 251 } | |
| 252 } | |
| 253 | |
| 254 /* Write out the header records into an a.out file. */ | |
| 255 void | |
| 256 write_header(int file, struct header *hdr, struct som_exec_auxhdr *auxhdr) | |
| 257 { | |
| 258 /* Update the checksum */ | |
| 259 hdr->checksum = calculate_checksum(hdr); | |
| 260 | |
| 261 /* Write the header back into the a.out file */ | |
| 262 lseek(file, 0, 0); | |
| 263 if (write(file, hdr, sizeof(*hdr)) != sizeof(*hdr)) | |
| 264 { perror("Couldn't write header to a.out file"); exit(1); } | |
| 265 lseek(file, hdr->aux_header_location, 0); | |
| 266 if (write(file, auxhdr, sizeof(*auxhdr)) != sizeof(*auxhdr)) | |
| 267 { perror("Couldn't write auxiliary header to a.out file"); exit(1); } | |
| 268 } | |
| 269 | |
| 270 /* Calculate the checksum of a SOM header record. */ | |
| 271 int | |
| 272 calculate_checksum(struct header *hdr) | |
| 273 { | |
| 274 int checksum, i, *ptr; | |
| 275 | |
| 276 checksum = 0; ptr = (int *) hdr; | |
| 277 | |
| 278 for (i=0; i<sizeof(*hdr)/sizeof(int)-1; i++) | |
| 279 checksum ^= ptr[i]; | |
| 280 | |
| 281 return(checksum); | |
| 282 } | |
| 283 | |
| 284 /* Copy size bytes from the old file to the new one. */ | |
| 285 void | |
| 3025 | 286 copy_file (int old, int new_, int size) |
| 428 | 287 { |
| 288 int len; | |
| 289 int buffer[8192]; /* word aligned will be faster */ | |
| 290 | |
| 291 for (; size > 0; size -= len) | |
| 292 { | |
| 442 | 293 len = size < sizeof (buffer) ? size : sizeof (buffer); |
| 294 if (read (old, buffer, len) != len) | |
| 295 { | |
| 296 perror ("Read failure on a.out file"); | |
| 297 exit (1); | |
| 298 } | |
| 3025 | 299 if (write (new_, buffer, len) != len) |
| 442 | 300 { |
| 301 perror ("Write failure in a.out file"); | |
| 302 exit (1); | |
| 303 } | |
| 428 | 304 } |
| 305 } | |
| 306 | |
| 307 /* Copy the rest of the file, up to EOF. */ | |
| 308 void | |
| 3025 | 309 copy_rest (int old, int new_) |
| 428 | 310 { |
| 311 int buffer[4096]; | |
| 312 int len; | |
| 313 | |
| 314 /* Copy bytes until end of file or error */ | |
| 315 while ( (len = read(old, buffer, sizeof(buffer))) > 0) | |
| 3025 | 316 if (write(new_, buffer, len) != len) break; |
| 428 | 317 |
| 318 if (len != 0) | |
| 319 { perror("Unable to copy the rest of the file"); exit(1); } | |
| 320 } | |
| 321 | |
| 322 #ifdef DEBUG | |
| 323 display_header(struct header *hdr, struct som_exec_auxhdr *auxhdr) | |
| 324 { | |
| 325 /* Display the header information (debug) */ | |
| 326 printf("\n\nFILE HEADER\n"); | |
| 327 printf("magic number %d \n", hdr->a_magic); | |
| 328 printf("text loc %.8x size %d \n", auxhdr->exec_tmem, auxhdr->exec_tsize); | |
| 329 printf("data loc %.8x size %d \n", auxhdr->exec_dmem, auxhdr->exec_dsize); | |
| 330 printf("entry %x \n", auxhdr->exec_entry); | |
| 331 printf("Bss segment size %u\n", auxhdr->exec_bsize); | |
| 332 printf("\n"); | |
| 333 printf("data file loc %d size %d\n", | |
| 334 auxhdr->exec_dfile, auxhdr->exec_dsize); | |
| 335 printf("som_length %d\n", hdr->som_length); | |
| 336 printf("unloadable sploc %d size %d\n", | |
| 337 hdr->unloadable_sp_location, hdr->unloadable_sp_size); | |
| 338 } | |
| 339 #endif /* DEBUG */ | |
| 340 | |
| 341 #ifdef HPUX_USE_SHLIBS | |
| 342 /* Added machinery for shared libs... see comments at the beginning of this file. */ | |
| 343 | |
| 344 void *Brk_On_Dump = 0; /* Brk value to restore... stored as a global */ | |
| 345 | |
| 442 | 346 static void |
| 347 Save_Shared_Data (void) | |
| 348 { | |
| 349 Brk_On_Dump = sbrk (0); | |
| 428 | 350 } |
| 351 | |
| 442 | 352 static void |
| 353 Restore_Shared_Data (void) | |
| 354 { | |
| 355 brk (Brk_On_Dump); | |
| 428 | 356 } |
| 357 | |
| 358 /* run_time_remap is the magic called by startup code in the dumped executable | |
| 442 | 359 if RUN_TIME_REMAP is set. */ |
| 360 int | |
| 2286 | 361 run_time_remap (char *UNUSED (dummy)) |
| 442 | 362 { |
| 363 Restore_Shared_Data (); | |
| 364 return 0; | |
| 365 } | |
| 428 | 366 #endif /* HPUX_USE_SHLIBS */ |