0
+ − 1 /* Unexec for MIPS (including IRIS4D).
+ − 2 Copyright (C) 1988, 1992, 1993, 1994
+ − 3 Free Software Foundation, Inc.
+ − 4
+ − 5 This file is part of XEmacs.
+ − 6
+ − 7 XEmacs is free software; you can redistribute it and/or modify it
+ − 8 under the terms of the GNU General Public License as published by the
+ − 9 Free Software Foundation; either version 2, or (at your option) any
+ − 10 later version.
+ − 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
+ − 18 along with XEmacs; see the file COPYING. If not, write to
+ − 19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ − 20 Boston, MA 02111-1307, USA. */
+ − 21
+ − 22 /* Synched up with: FSF 19.31. */
+ − 23
+ − 24 #include <config.h>
+ − 25 #include <sys/types.h>
+ − 26 #include <sys/file.h>
+ − 27 #include <sys/stat.h>
+ − 28 #include <stdio.h>
398
+ − 29 #include <errno.h>
0
+ − 30 #include <varargs.h>
+ − 31
+ − 32 #ifdef MACH
+ − 33
+ − 34 #include <a.out.h>
+ − 35
+ − 36 /* I don't know why this isn't defined. */
+ − 37 #ifndef STYP_INIT
+ − 38 #define STYP_INIT 0x80000000
+ − 39 #endif
+ − 40
+ − 41 /* I don't know why this isn't defined. */
+ − 42 #ifndef _RDATA
+ − 43 #define _RDATA ".rdata"
+ − 44 #define STYP_RDATA 0x00000100
+ − 45 #endif
+ − 46
+ − 47 /* Small ("near") data section. */
+ − 48 #ifndef _SDATA
+ − 49 #define _SDATA ".sdata"
+ − 50 #define STYP_SDATA 0x00000200
+ − 51 #endif
+ − 52
+ − 53 /* Small ("near") bss section. */
+ − 54 #ifndef _SBSS
+ − 55 #define _SBSS ".sbss"
+ − 56 #define STYP_SBSS 0x00000400
+ − 57 #endif
+ − 58
+ − 59 /* We don't seem to have a sym.h or syms.h anywhere, so we'll do it the
+ − 60 hard way. This stinks. */
+ − 61 typedef struct {
+ − 62 short magic;
+ − 63 short vstamp;
+ − 64 long ilineMax;
+ − 65 struct { long foo, offset; } offsets[11];
+ − 66 } HDRR, *pHDRR;
+ − 67
+ − 68 #else /* not MACH */
+ − 69
+ − 70 #include <filehdr.h>
+ − 71 #include <aouthdr.h>
+ − 72 #include <scnhdr.h>
+ − 73 #include <sym.h>
+ − 74
+ − 75 #endif /* not MACH */
+ − 76
+ − 77 #if defined (IRIS_4D) || defined (sony)
+ − 78 #include "getpagesize.h"
+ − 79 #include <fcntl.h>
+ − 80 #endif
+ − 81
+ − 82 static void fatal_unexec ();
+ − 83 static void mark_x ();
+ − 84
+ − 85 #define READ(_fd, _buffer, _size, _error_message, _error_arg) \
+ − 86 errno = EEOF; \
+ − 87 if (read (_fd, _buffer, _size) != _size) \
+ − 88 fatal_unexec (_error_message, _error_arg);
+ − 89
+ − 90 #define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \
+ − 91 if (write (_fd, _buffer, _size) != _size) \
+ − 92 fatal_unexec (_error_message, _error_arg);
+ − 93
+ − 94 #define SEEK(_fd, _position, _error_message, _error_arg) \
+ − 95 errno = EEOF; \
+ − 96 if (lseek (_fd, _position, L_SET) != _position) \
+ − 97 fatal_unexec (_error_message, _error_arg);
+ − 98
+ − 99 extern char *strerror ();
+ − 100 #define EEOF -1
+ − 101
+ − 102 static struct scnhdr *text_section;
+ − 103 static struct scnhdr *init_section;
+ − 104 static struct scnhdr *finit_section;
+ − 105 static struct scnhdr *rdata_section;
+ − 106 static struct scnhdr *data_section;
+ − 107 static struct scnhdr *lit8_section;
+ − 108 static struct scnhdr *lit4_section;
+ − 109 static struct scnhdr *sdata_section;
+ − 110 static struct scnhdr *sbss_section;
+ − 111 static struct scnhdr *bss_section;
+ − 112
+ − 113 struct headers {
+ − 114 struct filehdr fhdr;
+ − 115 struct aouthdr aout;
+ − 116 struct scnhdr section[10];
+ − 117 };
+ − 118
+ − 119 /* Define name of label for entry point for the dumped executable. */
+ − 120
+ − 121 #ifndef DEFAULT_ENTRY_ADDRESS
+ − 122 #define DEFAULT_ENTRY_ADDRESS __start
+ − 123 #endif
+ − 124
+ − 125 unexec (new_name, a_name, data_start, bss_start, entry_address)
+ − 126 char *new_name, *a_name;
+ − 127 unsigned data_start, bss_start, entry_address;
+ − 128 {
+ − 129 int new, old;
+ − 130 int pagesize, brk;
+ − 131 int newsyms, symrel;
+ − 132 int nread;
+ − 133 struct headers hdr;
+ − 134 int i;
+ − 135 int vaddr, scnptr;
+ − 136 #define BUFSIZE 8192
+ − 137 char buffer[BUFSIZE];
+ − 138
+ − 139 old = open (a_name, O_RDONLY, 0);
+ − 140 if (old < 0) fatal_unexec ("opening %s", a_name);
+ − 141
+ − 142 new = creat (new_name, 0666);
+ − 143 if (new < 0) fatal_unexec ("creating %s", new_name);
+ − 144
+ − 145 hdr = *((struct headers *)TEXT_START);
+ − 146 #ifdef MIPS2
+ − 147 if (hdr.fhdr.f_magic != MIPSELMAGIC
+ − 148 && hdr.fhdr.f_magic != MIPSEBMAGIC
+ − 149 && hdr.fhdr.f_magic != (MIPSELMAGIC | 1)
+ − 150 && hdr.fhdr.f_magic != (MIPSEBMAGIC | 1))
+ − 151 {
+ − 152 fprintf (stderr,
+ − 153 "unexec: input file magic number is %x, not %x, %x, %x or %x.\n",
+ − 154 hdr.fhdr.f_magic,
+ − 155 MIPSELMAGIC, MIPSEBMAGIC,
+ − 156 MIPSELMAGIC | 1, MIPSEBMAGIC | 1);
+ − 157 exit(1);
+ − 158 }
+ − 159 #else /* not MIPS2 */
+ − 160 if (hdr.fhdr.f_magic != MIPSELMAGIC
+ − 161 && hdr.fhdr.f_magic != MIPSEBMAGIC)
+ − 162 {
+ − 163 fprintf (stderr, "unexec: input file magic number is %x, not %x or %x.\n",
+ − 164 hdr.fhdr.f_magic, MIPSELMAGIC, MIPSEBMAGIC);
+ − 165 exit (1);
+ − 166 }
+ − 167 #endif /* not MIPS2 */
+ − 168 if (hdr.fhdr.f_opthdr != sizeof (hdr.aout))
+ − 169 {
+ − 170 fprintf (stderr, "unexec: input a.out header is %d bytes, not %d.\n",
+ − 171 hdr.fhdr.f_opthdr, sizeof (hdr.aout));
+ − 172 exit (1);
+ − 173 }
+ − 174 if (hdr.aout.magic != ZMAGIC)
+ − 175 {
+ − 176 fprintf (stderr, "unexec: input file a.out magic number is %o, not %o.\n",
+ − 177 hdr.aout.magic, ZMAGIC);
+ − 178 exit (1);
+ − 179 }
+ − 180
+ − 181 #define CHECK_SCNHDR(ptr, name, flags) \
+ − 182 ptr = NULL; \
+ − 183 for (i = 0; i < hdr.fhdr.f_nscns && !ptr; i++) \
+ − 184 if (strcmp (hdr.section[i].s_name, name) == 0) \
+ − 185 { \
+ − 186 if (hdr.section[i].s_flags != flags) \
+ − 187 fprintf (stderr, "unexec: %x flags (%x expected) in %s section.\n", \
+ − 188 hdr.section[i].s_flags, flags, name); \
+ − 189 ptr = hdr.section + i; \
+ − 190 }
+ − 191
+ − 192 CHECK_SCNHDR (text_section, _TEXT, STYP_TEXT);
+ − 193 CHECK_SCNHDR (init_section, _INIT, STYP_INIT);
+ − 194 CHECK_SCNHDR (rdata_section, _RDATA, STYP_RDATA);
+ − 195 CHECK_SCNHDR (data_section, _DATA, STYP_DATA);
+ − 196 #ifdef _LIT8
+ − 197 CHECK_SCNHDR (lit8_section, _LIT8, STYP_LIT8);
+ − 198 CHECK_SCNHDR (lit4_section, _LIT4, STYP_LIT4);
+ − 199 #endif /* _LIT8 */
+ − 200 CHECK_SCNHDR (sdata_section, _SDATA, STYP_SDATA);
+ − 201 CHECK_SCNHDR (sbss_section, _SBSS, STYP_SBSS);
+ − 202 CHECK_SCNHDR (bss_section, _BSS, STYP_BSS);
+ − 203 #if 0 /* Apparently this error check goes off on irix 3.3,
+ − 204 but it doesn't indicate a real problem. */
+ − 205 if (i != hdr.fhdr.f_nscns)
+ − 206 fprintf (stderr, "unexec: %d sections found instead of %d.\n",
+ − 207 i, hdr.fhdr.f_nscns);
+ − 208 #endif
+ − 209
+ − 210 text_section->s_scnptr = 0;
+ − 211
+ − 212 pagesize = getpagesize ();
+ − 213 /* Casting to int avoids compiler error on NEWS-OS 5.0.2. */
+ − 214 brk = (((int) (sbrk (0))) + pagesize - 1) & (-pagesize);
+ − 215 hdr.aout.dsize = brk - DATA_START;
+ − 216 hdr.aout.bsize = 0;
+ − 217 if (entry_address == 0)
+ − 218 {
+ − 219 extern DEFAULT_ENTRY_ADDRESS ();
+ − 220 hdr.aout.entry = (unsigned)DEFAULT_ENTRY_ADDRESS;
+ − 221 }
+ − 222 else
+ − 223 hdr.aout.entry = entry_address;
+ − 224
+ − 225 hdr.aout.bss_start = hdr.aout.data_start + hdr.aout.dsize;
+ − 226 rdata_section->s_size = data_start - DATA_START;
+ − 227
+ − 228 /* Adjust start and virtual addresses of rdata_section, too. */
+ − 229 rdata_section->s_vaddr = DATA_START;
+ − 230 rdata_section->s_paddr = DATA_START;
+ − 231 rdata_section->s_scnptr = text_section->s_scnptr + hdr.aout.tsize;
+ − 232
+ − 233 data_section->s_vaddr = data_start;
+ − 234 data_section->s_paddr = data_start;
+ − 235 data_section->s_size = brk - data_start;
+ − 236 data_section->s_scnptr = rdata_section->s_scnptr + rdata_section->s_size;
+ − 237 vaddr = data_section->s_vaddr + data_section->s_size;
+ − 238 scnptr = data_section->s_scnptr + data_section->s_size;
+ − 239 if (lit8_section != NULL)
+ − 240 {
+ − 241 lit8_section->s_vaddr = vaddr;
+ − 242 lit8_section->s_paddr = vaddr;
+ − 243 lit8_section->s_size = 0;
+ − 244 lit8_section->s_scnptr = scnptr;
+ − 245 }
+ − 246 if (lit4_section != NULL)
+ − 247 {
+ − 248 lit4_section->s_vaddr = vaddr;
+ − 249 lit4_section->s_paddr = vaddr;
+ − 250 lit4_section->s_size = 0;
+ − 251 lit4_section->s_scnptr = scnptr;
+ − 252 }
+ − 253 if (sdata_section != NULL)
+ − 254 {
+ − 255 sdata_section->s_vaddr = vaddr;
+ − 256 sdata_section->s_paddr = vaddr;
+ − 257 sdata_section->s_size = 0;
+ − 258 sdata_section->s_scnptr = scnptr;
+ − 259 }
+ − 260 if (sbss_section != NULL)
+ − 261 {
+ − 262 sbss_section->s_vaddr = vaddr;
+ − 263 sbss_section->s_paddr = vaddr;
+ − 264 sbss_section->s_size = 0;
+ − 265 sbss_section->s_scnptr = scnptr;
+ − 266 }
+ − 267 if (bss_section != NULL)
+ − 268 {
+ − 269 bss_section->s_vaddr = vaddr;
+ − 270 bss_section->s_paddr = vaddr;
+ − 271 bss_section->s_size = 0;
+ − 272 bss_section->s_scnptr = scnptr;
+ − 273 }
+ − 274
+ − 275 WRITE (new, (void *) TEXT_START, hdr.aout.tsize,
+ − 276 "writing text section to %s", new_name);
+ − 277 WRITE (new, (void *) DATA_START, hdr.aout.dsize,
+ − 278 "writing data section to %s", new_name);
+ − 279
+ − 280 SEEK (old, hdr.fhdr.f_symptr, "seeking to start of symbols in %s", a_name);
+ − 281 errno = EEOF;
+ − 282 nread = read (old, buffer, BUFSIZE);
+ − 283 if (nread < sizeof (HDRR)) fatal_unexec ("reading symbols from %s", a_name);
+ − 284 newsyms = hdr.aout.tsize + hdr.aout.dsize;
+ − 285 symrel = newsyms - hdr.fhdr.f_symptr;
+ − 286 hdr.fhdr.f_symptr = newsyms;
+ − 287 #define symhdr ((pHDRR)buffer)
+ − 288 #ifdef MACH
+ − 289 for (i = 0; i < 11; i++)
+ − 290 symhdr->offsets[i].offset += symrel;
+ − 291 #else
+ − 292 symhdr->cbLineOffset += symrel;
+ − 293 symhdr->cbDnOffset += symrel;
+ − 294 symhdr->cbPdOffset += symrel;
+ − 295 symhdr->cbSymOffset += symrel;
+ − 296 symhdr->cbOptOffset += symrel;
+ − 297 symhdr->cbAuxOffset += symrel;
+ − 298 symhdr->cbSsOffset += symrel;
+ − 299 symhdr->cbSsExtOffset += symrel;
+ − 300 symhdr->cbFdOffset += symrel;
+ − 301 symhdr->cbRfdOffset += symrel;
+ − 302 symhdr->cbExtOffset += symrel;
+ − 303 #endif
+ − 304 #undef symhdr
+ − 305 do
+ − 306 {
+ − 307 if (write (new, buffer, nread) != nread)
+ − 308 fatal_unexec ("writing symbols to %s", new_name);
+ − 309 nread = read (old, buffer, BUFSIZE);
+ − 310 if (nread < 0) fatal_unexec ("reading symbols from %s", a_name);
+ − 311 #undef BUFSIZE
+ − 312 } while (nread != 0);
+ − 313
+ − 314 SEEK (new, 0, "seeking to start of header in %s", new_name);
+ − 315 WRITE (new, &hdr, sizeof (hdr),
+ − 316 "writing header of %s", new_name);
+ − 317
+ − 318 close (old);
+ − 319 close (new);
+ − 320 mark_x (new_name);
+ − 321 }
+ − 322
+ − 323 /*
+ − 324 * mark_x
+ − 325 *
+ − 326 * After successfully building the new a.out, mark it executable
+ − 327 */
+ − 328
+ − 329 static void
+ − 330 mark_x (name)
+ − 331 char *name;
+ − 332 {
+ − 333 struct stat sbuf;
+ − 334 int um = umask (777);
+ − 335 umask (um);
+ − 336 if (stat (name, &sbuf) < 0)
+ − 337 fatal_unexec ("getting protection on %s", name);
+ − 338 sbuf.st_mode |= 0111 & ~um;
+ − 339 if (chmod (name, sbuf.st_mode) < 0)
+ − 340 fatal_unexec ("setting protection on %s", name);
+ − 341 }
+ − 342
+ − 343 static void
+ − 344 fatal_unexec (s, va_alist)
+ − 345 va_dcl
+ − 346 {
+ − 347 va_list ap;
+ − 348 if (errno == EEOF)
+ − 349 fputs ("unexec: unexpected end of file, ", stderr);
+ − 350 else
+ − 351 fprintf (stderr, "unexec: %s, ", strerror (errno));
+ − 352 va_start (ap);
+ − 353 _doprnt (s, ap, stderr);
+ − 354 fputs (".\n", stderr);
+ − 355 exit (1);
+ − 356 }
