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1.1 root 1: /* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc.
2:
3: This program is free software; you can redistribute it and/or modify
4: it under the terms of the GNU General Public License as published by
5: the Free Software Foundation; either version 1, or (at your option)
6: any later version.
7:
8: This program is distributed in the hope that it will be useful,
9: but WITHOUT ANY WARRANTY; without even the implied warranty of
10: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11: GNU General Public License for more details.
12:
13: You should have received a copy of the GNU General Public License
14: along with this program; if not, write to the Free Software
15: Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16:
17: In other words, you are welcome to use, share and improve this program.
18: You are forbidden to forbid anyone else to use, share and improve
19: what you give them. Help stamp out software-hoarding! */
20:
21:
22: /*
23: * unexec.c - Convert a running program into an a.out file.
24: *
25: * Author: Spencer W. Thomas
26: * Computer Science Dept.
27: * University of Utah
28: * Date: Tue Mar 2 1982
29: * Modified heavily since then.
30: *
31: * Synopsis:
32: * unexec (new_name, a_name, data_start, bss_start, entry_address)
33: * char *new_name, *a_name;
34: * unsigned data_start, bss_start, entry_address;
35: *
36: * Takes a snapshot of the program and makes an a.out format file in the
37: * file named by the string argument new_name.
38: * If a_name is non-NULL, the symbol table will be taken from the given file.
39: * On some machines, an existing a_name file is required.
40: *
41: * The boundaries within the a.out file may be adjusted with the data_start
42: * and bss_start arguments. Either or both may be given as 0 for defaults.
43: *
44: * Data_start gives the boundary between the text segment and the data
45: * segment of the program. The text segment can contain shared, read-only
46: * program code and literal data, while the data segment is always unshared
47: * and unprotected. Data_start gives the lowest unprotected address.
48: * The value you specify may be rounded down to a suitable boundary
49: * as required by the machine you are using.
50: *
51: * Specifying zero for data_start means the boundary between text and data
52: * should not be the same as when the program was loaded.
53: * If NO_REMAP is defined, the argument data_start is ignored and the
54: * segment boundaries are never changed.
55: *
56: * Bss_start indicates how much of the data segment is to be saved in the
57: * a.out file and restored when the program is executed. It gives the lowest
58: * unsaved address, and is rounded up to a page boundary. The default when 0
59: * is given assumes that the entire data segment is to be stored, including
60: * the previous data and bss as well as any additional storage allocated with
61: * break (2).
62: *
63: * The new file is set up to start at entry_address.
64: *
65: * If you make improvements I'd like to get them too.
66: * harpo!utah-cs!thomas, thomas@Utah-20
67: *
68: */
69:
70: /* Even more heavily modified by [email protected] of Dell Computer Co.
71: * ELF support added.
72: *
73: * Basic theory: the data space of the running process needs to be
74: * dumped to the output file. Normally we would just enlarge the size
75: * of .data, scooting everything down. But we can't do that in ELF,
76: * because there is often something between the .data space and the
77: * .bss space.
78: *
79: * In the temacs dump below, notice that the Global Offset Table
80: * (.got) and the Dynamic link data (.dynamic) come between .data1 and
81: * .bss. It does not work to overlap .data with these fields.
82: *
83: * The solution is to create a new .data segment. This segment is
84: * filled with data from the current process. Since the contents of
85: * various sections refer to sections by index, the new .data segment
86: * is made the last in the table to avoid changing any existing index.
87:
88: * This is an example of how the section headers are changed. "Addr"
89: * is a process virtual address. "Offset" is a file offset.
90:
91: raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
92:
93: temacs:
94:
95: **** SECTION HEADER TABLE ****
96: [No] Type Flags Addr Offset Size Name
97: Link Info Adralgn Entsize
98:
99: [1] 1 2 0x80480d4 0xd4 0x13 .interp
100: 0 0 0x1 0
101:
102: [2] 5 2 0x80480e8 0xe8 0x388 .hash
103: 3 0 0x4 0x4
104:
105: [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
106: 4 1 0x4 0x10
107:
108: [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
109: 0 0 0x1 0
110:
111: [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
112: 3 7 0x4 0x8
113:
114: [6] 1 6 0x8049348 0x1348 0x3 .init
115: 0 0 0x4 0
116:
117: [7] 1 6 0x804934c 0x134c 0x680 .plt
118: 0 0 0x4 0x4
119:
120: [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
121: 0 0 0x4 0
122:
123: [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
124: 0 0 0x4 0
125:
126: [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
127: 0 0 0x4 0
128:
129: [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
130: 0 0 0x4 0
131:
132: [12] 1 3 0x8088330 0x3f330 0x20afc .data
133: 0 0 0x4 0
134:
135: [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
136: 0 0 0x4 0
137:
138: [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
139: 0 0 0x4 0x4
140:
141: [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
142: 4 0 0x4 0x8
143:
144: [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
145: 0 0 0x4 0
146:
147: [17] 2 0 0 0x608f4 0x9b90 .symtab
148: 18 371 0x4 0x10
149:
150: [18] 3 0 0 0x6a484 0x8526 .strtab
151: 0 0 0x1 0
152:
153: [19] 3 0 0 0x729aa 0x93 .shstrtab
154: 0 0 0x1 0
155:
156: [20] 1 0 0 0x72a3d 0x68b7 .comment
157: 0 0 0x1 0
158:
159: raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
160:
161: xemacs:
162:
163: **** SECTION HEADER TABLE ****
164: [No] Type Flags Addr Offset Size Name
165: Link Info Adralgn Entsize
166:
167: [1] 1 2 0x80480d4 0xd4 0x13 .interp
168: 0 0 0x1 0
169:
170: [2] 5 2 0x80480e8 0xe8 0x388 .hash
171: 3 0 0x4 0x4
172:
173: [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
174: 4 1 0x4 0x10
175:
176: [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
177: 0 0 0x1 0
178:
179: [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
180: 3 7 0x4 0x8
181:
182: [6] 1 6 0x8049348 0x1348 0x3 .init
183: 0 0 0x4 0
184:
185: [7] 1 6 0x804934c 0x134c 0x680 .plt
186: 0 0 0x4 0x4
187:
188: [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
189: 0 0 0x4 0
190:
191: [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
192: 0 0 0x4 0
193:
194: [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
195: 0 0 0x4 0
196:
197: [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
198: 0 0 0x4 0
199:
200: [12] 1 3 0x8088330 0x3f330 0x20afc .data
201: 0 0 0x4 0
202:
203: [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
204: 0 0 0x4 0
205:
206: [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
207: 0 0 0x4 0x4
208:
209: [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
210: 4 0 0x4 0x8
211:
212: [16] 8 3 0x80c6800 0x7d800 0 .bss
213: 0 0 0x4 0
214:
215: [17] 2 0 0 0x7d800 0x9b90 .symtab
216: 18 371 0x4 0x10
217:
218: [18] 3 0 0 0x87390 0x8526 .strtab
219: 0 0 0x1 0
220:
221: [19] 3 0 0 0x8f8b6 0x93 .shstrtab
222: 0 0 0x1 0
223:
224: [20] 1 0 0 0x8f949 0x68b7 .comment
225: 0 0 0x1 0
226:
227: [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
228: 0 0 0x4 0
229:
230: * This is an example of how the file header is changed. "Shoff" is
231: * the section header offset within the file. Since that table is
232: * after the new .data section, it is moved. "Shnum" is the number of
233: * sections, which we increment.
234: *
235: * "Phoff" is the file offset to the program header. "Phentsize" and
236: * "Shentsz" are the program and section header entries sizes respectively.
237: * These can be larger than the apparent struct sizes.
238:
239: raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
240:
241: temacs:
242:
243: **** ELF HEADER ****
244: Class Data Type Machine Version
245: Entry Phoff Shoff Flags Ehsize
246: Phentsize Phnum Shentsz Shnum Shstrndx
247:
248: 1 1 2 3 1
249: 0x80499cc 0x34 0x792f4 0 0x34
250: 0x20 5 0x28 21 19
251:
252: raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
253:
254: xemacs:
255:
256: **** ELF HEADER ****
257: Class Data Type Machine Version
258: Entry Phoff Shoff Flags Ehsize
259: Phentsize Phnum Shentsz Shnum Shstrndx
260:
261: 1 1 2 3 1
262: 0x80499cc 0x34 0x96200 0 0x34
263: 0x20 5 0x28 22 19
264:
265: * These are the program headers. "Offset" is the file offset to the
266: * segment. "Vaddr" is the memory load address. "Filesz" is the
267: * segment size as it appears in the file, and "Memsz" is the size in
268: * memory. Below, the third segment is the code and the fourth is the
269: * data: the difference between Filesz and Memsz is .bss
270:
271: raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
272:
273: temacs:
274: ***** PROGRAM EXECUTION HEADER *****
275: Type Offset Vaddr Paddr
276: Filesz Memsz Flags Align
277:
278: 6 0x34 0x8048034 0
279: 0xa0 0xa0 5 0
280:
281: 3 0xd4 0 0
282: 0x13 0 4 0
283:
284: 1 0x34 0x8048034 0
285: 0x3f2f9 0x3f2f9 5 0x1000
286:
287: 1 0x3f330 0x8088330 0
288: 0x215c4 0x25a60 7 0x1000
289:
290: 2 0x60874 0x80a9874 0
291: 0x80 0 7 0
292:
293: raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
294:
295: xemacs:
296: ***** PROGRAM EXECUTION HEADER *****
297: Type Offset Vaddr Paddr
298: Filesz Memsz Flags Align
299:
300: 6 0x34 0x8048034 0
301: 0xa0 0xa0 5 0
302:
303: 3 0xd4 0 0
304: 0x13 0 4 0
305:
306: 1 0x34 0x8048034 0
307: 0x3f2f9 0x3f2f9 5 0x1000
308:
309: 1 0x3f330 0x8088330 0
310: 0x3e4d0 0x3e4d0 7 0x1000
311:
312: 2 0x60874 0x80a9874 0
313: 0x80 0 7 0
314:
315:
316: */
317:
318: #include <sys/types.h>
319: #include <stdio.h>
320: #include <sys/stat.h>
321: #include <memory.h>
322: #include <string.h>
323: #include <errno.h>
324: #include <unistd.h>
325: #include <fcntl.h>
326: #include <elf.h>
327: #include <sys/mman.h>
328:
329: #ifndef emacs
330: #define fatal(a, b, c) fprintf(stderr, a, b, c), exit(1)
331: #else
332: extern void fatal(char *, ...);
333: #endif
334:
335: /* Get the address of a particular section or program header entry,
336: * accounting for the size of the entries.
337: */
338:
339: #define OLD_SECTION_H(n) \
340: (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
341: #define NEW_SECTION_H(n) \
342: (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
343: #define OLD_PROGRAM_H(n) \
344: (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
345: #define NEW_PROGRAM_H(n) \
346: (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
347:
348: typedef unsigned char byte;
349:
350: /* Round X up to a multiple of Y. */
351:
352: int
353: round_up (x, y)
354: int x, y;
355: {
356: int rem = x % y;
357: if (rem == 0)
358: return x;
359: return x - rem + y;
360: }
361:
362: /* ****************************************************************
363: * unexec
364: *
365: * driving logic.
366: *
367: * In ELF, this works by replacing the old .bss section with a new
368: * .data section, and inserting an empty .bss immediately afterwards.
369: *
370: */
371: void
372: unexec (new_name, old_name, data_start, bss_start, entry_address)
373: char *new_name, *old_name;
374: unsigned data_start, bss_start, entry_address;
375: {
376: extern unsigned int bss_end;
377: int new_file, old_file, new_file_size;
378:
379: /* Pointers to the base of the image of the two files. */
380: caddr_t old_base, new_base;
381:
382: /* Pointers to the file, program and section headers for the old and new
383: * files.
384: */
385: Elf32_Ehdr *old_file_h, *new_file_h;
386: Elf32_Phdr *old_program_h, *new_program_h;
387: Elf32_Shdr *old_section_h, *new_section_h;
388:
389: /* Point to the section name table in the old file */
390: char *old_section_names;
391:
392: Elf32_Addr old_bss_addr, new_bss_addr;
393: Elf32_Word old_bss_size, new_data2_size;
394: Elf32_Off new_data2_offset;
395: Elf32_Addr new_data2_addr;
396:
397: int n, old_bss_index, old_data_index, new_data2_index;
398: struct stat stat_buf;
399:
400: /* Open the old file & map it into the address space. */
401:
402: old_file = open (old_name, O_RDONLY);
403:
404: if (old_file < 0)
405: fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
406:
407: if (fstat (old_file, &stat_buf) == -1)
408: fatal ("Can't fstat(%s): errno %d\n", old_name, errno);
409:
410: old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
411:
412: if (old_base == (caddr_t) -1)
413: fatal ("Can't mmap(%s): errno %d\n", old_name, errno);
414:
415: #ifdef DEBUG
416: fprintf (stderr, "mmap(%s, %x) -> %x\n", old_name, stat_buf.st_size,
417: old_base);
418: #endif
419:
420: /* Get pointers to headers & section names */
421:
422: old_file_h = (Elf32_Ehdr *) old_base;
423: old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff);
424: old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff);
425: old_section_names = (char *) old_base
426: + OLD_SECTION_H(old_file_h->e_shstrndx).sh_offset;
427:
428: /* Find the old .bss section. Figure out parameters of the new
429: * data2 and bss sections.
430: */
431:
432: for (old_bss_index = 1; old_bss_index < old_file_h->e_shnum; old_bss_index++)
433: {
434: #ifdef DEBUG
435: fprintf (stderr, "Looking for .bss - found %s\n",
436: old_section_names + OLD_SECTION_H(old_bss_index).sh_name);
437: #endif
438: if (!strcmp (old_section_names + OLD_SECTION_H(old_bss_index).sh_name,
439: ".bss"))
440: break;
441: }
442: if (old_bss_index == old_file_h->e_shnum)
443: fatal ("Can't find .bss in %s.\n", old_name, 0);
444:
445: old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
446: old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
447: #if defined(emacs) || !defined(DEBUG)
448: bss_end = (unsigned int) sbrk (0);
449: new_bss_addr = (Elf32_Addr) bss_end;
450: #else
451: new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
452: #endif
453: new_data2_addr = old_bss_addr;
454: new_data2_size = new_bss_addr - old_bss_addr;
455: new_data2_offset = OLD_SECTION_H(old_bss_index).sh_offset;
456:
457: #ifdef DEBUG
458: fprintf (stderr, "old_bss_index %d\n", old_bss_index);
459: fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
460: fprintf (stderr, "old_bss_size %x\n", old_bss_size);
461: fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
462: fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
463: fprintf (stderr, "new_data2_size %x\n", new_data2_size);
464: fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
465: #endif
466:
467: if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
468: fatal (".bss shrank when undumping???\n", 0, 0);
469:
470: /* Set the output file to the right size and mmap(2) it. Set
471: * pointers to various interesting objects. stat_buf still has
472: * old_file data.
473: */
474:
475: new_file = open (new_name, O_RDWR | O_CREAT, 0666);
476: if (new_file < 0)
477: fatal ("Can't creat(%s): errno %d\n", new_name, errno);
478:
479: new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
480:
481: if (ftruncate (new_file, new_file_size))
482: fatal ("Can't ftruncate(%s): errno %d\n", new_name, errno);
483:
484: new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
485: new_file, 0);
486:
487: if (new_base == (caddr_t) -1)
488: fatal ("Can't mmap(%s): errno %d\n", new_name, errno);
489:
490: new_file_h = (Elf32_Ehdr *) new_base;
491: new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff);
492: new_section_h = (Elf32_Shdr *)
493: ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
494:
495: /* Make our new file, program and section headers as copies of the
496: * originals.
497: */
498:
499: memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
500: memcpy (new_program_h, old_program_h,
501: old_file_h->e_phnum * old_file_h->e_phentsize);
502: memcpy (new_section_h, old_section_h,
503: old_file_h->e_shnum * old_file_h->e_shentsize);
504:
505: /* Fix up file header. We'll add one section. Section header is
506: * further away now.
507: */
508:
509: new_file_h->e_shoff += new_data2_size;
510: new_file_h->e_shnum += 1;
511:
512: #ifdef DEBUG
513: fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
514: fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
515: fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
516: fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
517: #endif
518:
519: /* Fix up a new program header. Extend the writable data segment so
520: * that the bss area is covered too. Find that segment by looking
521: * for a segment that ends just before the .bss area. Make sure
522: * that no segments are above the new .data2. Put a loop at the end
523: * to adjust the offset and address of any segment that is above
524: * data2, just in case we decide to allow this later.
525: */
526:
527: for (n = new_file_h->e_phnum - 1; n >= 0; n--)
528: {
529: /* Compute maximum of all requirements for alignment of section. */
530: int alignment = (NEW_PROGRAM_H (n)).p_align;
531: if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
532: alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
533:
534: if (NEW_PROGRAM_H(n).p_vaddr + NEW_PROGRAM_H(n).p_filesz > old_bss_addr)
535: fatal ("Program segment above .bss in %s\n", old_name, 0);
536:
537: if (NEW_PROGRAM_H(n).p_type == PT_LOAD
538: && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
539: + (NEW_PROGRAM_H (n)).p_filesz,
540: alignment)
541: == round_up (old_bss_addr, alignment)))
542: break;
543: }
544: if (n < 0)
545: fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
546:
547: NEW_PROGRAM_H(n).p_filesz += new_data2_size;
548: NEW_PROGRAM_H(n).p_memsz = NEW_PROGRAM_H(n).p_filesz;
549:
550: #if 0 /* Maybe allow section after data2 - does this ever happen? */
551: for (n = new_file_h->e_phnum - 1; n >= 0; n--)
552: {
553: if (NEW_PROGRAM_H(n).p_vaddr
554: && NEW_PROGRAM_H(n).p_vaddr >= new_data2_addr)
555: NEW_PROGRAM_H(n).p_vaddr += new_data2_size - old_bss_size;
556:
557: if (NEW_PROGRAM_H(n).p_offset >= new_data2_offset)
558: NEW_PROGRAM_H(n).p_offset += new_data2_size;
559: }
560: #endif
561:
562: /* Fix up section headers based on new .data2 section. Any section
563: * whose offset or virtual address is after the new .data2 section
564: * gets its value adjusted. .bss size becomes zero and new address
565: * is set. data2 section header gets added by copying the existing
566: * .data header and modifying the offset, address and size.
567: */
568:
569: for (n = 1; n < new_file_h->e_shnum; n++)
570: {
571: if (NEW_SECTION_H(n).sh_offset >= new_data2_offset)
572: NEW_SECTION_H(n).sh_offset += new_data2_size;
573:
574: if (NEW_SECTION_H(n).sh_addr
575: && NEW_SECTION_H(n).sh_addr >= new_data2_addr)
576: NEW_SECTION_H(n).sh_addr += new_data2_size - old_bss_size;
577: }
578:
579: new_data2_index = old_file_h->e_shnum;
580:
581: for (old_data_index = 1; old_data_index < old_file_h->e_shnum;
582: old_data_index++)
583: if (!strcmp (old_section_names + OLD_SECTION_H(old_data_index).sh_name,
584: ".data"))
585: break;
586: if (old_data_index == old_file_h->e_shnum)
587: fatal ("Can't find .data in %s.\n", old_name, 0);
588:
589: memcpy (&NEW_SECTION_H(new_data2_index), &OLD_SECTION_H(old_data_index),
590: new_file_h->e_shentsize);
591:
592: NEW_SECTION_H(new_data2_index).sh_addr = new_data2_addr;
593: NEW_SECTION_H(new_data2_index).sh_offset = new_data2_offset;
594: NEW_SECTION_H(new_data2_index).sh_size = new_data2_size;
595:
596: NEW_SECTION_H(old_bss_index).sh_size = 0;
597: NEW_SECTION_H(old_bss_index).sh_addr = new_data2_addr + new_data2_size;
598:
599: /* Write out the sections. .data and .data1 (and data2, called
600: * ".data" in the strings table) get copied from the current process
601: * instead of the old file.
602: */
603:
604: for (n = new_file_h->e_shnum - 1; n; n--)
605: {
606: caddr_t src;
607:
608: if (NEW_SECTION_H(n).sh_type == SHT_NULL
609: || NEW_SECTION_H(n).sh_type == SHT_NOBITS)
610: continue;
611:
612: if (!strcmp (old_section_names + NEW_SECTION_H(n).sh_name, ".data")
613: || !strcmp ((old_section_names + NEW_SECTION_H(n).sh_name),
614: ".data1"))
615: src = (caddr_t) NEW_SECTION_H(n).sh_addr;
616: else
617: src = old_base + OLD_SECTION_H(n).sh_offset;
618:
619: memcpy (NEW_SECTION_H(n).sh_offset + new_base, src,
620: NEW_SECTION_H(n).sh_size);
621: }
622:
623: /* Close the files and make the new file executable */
624:
625: if (close (old_file))
626: fatal ("Can't close(%s): errno %d\n", old_name, errno);
627:
628: if (close (new_file))
629: fatal ("Can't close(%s): errno %d\n", new_name, errno);
630:
631: if (stat (new_name, &stat_buf) == -1)
632: fatal ("Can't stat(%s): errno %d\n", new_name, errno);
633:
634: n = umask (777);
635: umask (n);
636: stat_buf.st_mode |= 0111 & ~n;
637: if (chmod (new_name, stat_buf.st_mode) == -1)
638: fatal ("Can't chmod(%s): errno %d\n", new_name, errno);
639: }
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