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Linux/arch/alpha/boot/tools/objstrip.c

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  1 /*
  2  * arch/alpha/boot/tools/objstrip.c
  3  *
  4  * Strip the object file headers/trailers from an executable (ELF or ECOFF).
  5  *
  6  * Copyright (C) 1996 David Mosberger-Tang.
  7  */
  8 /*
  9  * Converts an ECOFF or ELF object file into a bootable file.  The
 10  * object file must be a OMAGIC file (i.e., data and bss follow immediately
 11  * behind the text).  See DEC "Assembly Language Programmer's Guide"
 12  * documentation for details.  The SRM boot process is documented in
 13  * the Alpha AXP Architecture Reference Manual, Second Edition by
 14  * Richard L. Sites and Richard T. Witek.
 15  */
 16 #include <stdio.h>
 17 #include <string.h>
 18 #include <stdlib.h>
 19 #include <unistd.h>
 20 
 21 #include <sys/fcntl.h>
 22 #include <sys/stat.h>
 23 #include <sys/types.h>
 24 
 25 #include <linux/a.out.h>
 26 #include <linux/coff.h>
 27 #include <linux/param.h>
 28 #ifdef __ELF__
 29 # include <linux/elf.h>
 30 #endif
 31 
 32 /* bootfile size must be multiple of BLOCK_SIZE: */
 33 #define BLOCK_SIZE      512
 34 
 35 const char * prog_name;
 36 
 37 
 38 static void
 39 usage (void)
 40 {
 41     fprintf(stderr,
 42             "usage: %s [-v] -p file primary\n"
 43             "       %s [-vb] file [secondary]\n", prog_name, prog_name);
 44     exit(1);
 45 }
 46 
 47 
 48 int
 49 main (int argc, char *argv[])
 50 {
 51     size_t nwritten, tocopy, n, mem_size, fil_size, pad = 0;
 52     int fd, ofd, i, j, verbose = 0, primary = 0;
 53     char buf[8192], *inname;
 54     struct exec * aout;         /* includes file & aout header */
 55     long offset;
 56 #ifdef __ELF__
 57     struct elfhdr *elf;
 58     struct elf_phdr *elf_phdr;  /* program header */
 59     unsigned long long e_entry;
 60 #endif
 61 
 62     prog_name = argv[0];
 63 
 64     for (i = 1; i < argc && argv[i][0] == '-'; ++i) {
 65         for (j = 1; argv[i][j]; ++j) {
 66             switch (argv[i][j]) {
 67               case 'v':
 68                   verbose = ~verbose;
 69                   break;
 70 
 71               case 'b':
 72                   pad = BLOCK_SIZE;
 73                   break;
 74 
 75               case 'p':
 76                   primary = 1;          /* make primary bootblock */
 77                   break;
 78             }
 79         }
 80     }
 81 
 82     if (i >= argc) {
 83         usage();
 84     }
 85     inname = argv[i++];
 86 
 87     fd = open(inname, O_RDONLY);
 88     if (fd == -1) {
 89         perror("open");
 90         exit(1);
 91     }
 92 
 93     ofd = 1;
 94     if (i < argc) {
 95         ofd = open(argv[i++], O_WRONLY | O_CREAT | O_TRUNC, 0666);
 96         if (ofd == -1) {
 97             perror("open");
 98             exit(1);
 99         }
100     }
101 
102     if (primary) {
103         /* generate bootblock for primary loader */
104         
105         unsigned long bb[64], sum = 0;
106         struct stat st;
107         off_t size;
108         int i;
109 
110         if (ofd == 1) {
111             usage();
112         }
113 
114         if (fstat(fd, &st) == -1) {
115             perror("fstat");
116             exit(1);
117         }
118 
119         size = (st.st_size + BLOCK_SIZE - 1) & ~(BLOCK_SIZE - 1);
120         memset(bb, 0, sizeof(bb));
121         strcpy((char *) bb, "Linux SRM bootblock");
122         bb[60] = size / BLOCK_SIZE;     /* count */
123         bb[61] = 1;                     /* starting sector # */
124         bb[62] = 0;                     /* flags---must be 0 */
125         for (i = 0; i < 63; ++i) {
126             sum += bb[i];
127         }
128         bb[63] = sum;
129         if (write(ofd, bb, sizeof(bb)) != sizeof(bb)) {
130             perror("boot-block write");
131             exit(1);
132         }
133         printf("%lu\n", size);
134         return 0;
135     }
136 
137     /* read and inspect exec header: */
138 
139     if (read(fd, buf, sizeof(buf)) < 0) {
140         perror("read");
141         exit(1);
142     }
143 
144 #ifdef __ELF__
145     elf = (struct elfhdr *) buf;
146 
147     if (elf->e_ident[0] == 0x7f && strncmp((char *)elf->e_ident + 1, "ELF", 3) == 0) {
148         if (elf->e_type != ET_EXEC) {
149             fprintf(stderr, "%s: %s is not an ELF executable\n",
150                     prog_name, inname);
151             exit(1);
152         }
153         if (!elf_check_arch(elf)) {
154             fprintf(stderr, "%s: is not for this processor (e_machine=%d)\n",
155                     prog_name, elf->e_machine);
156             exit(1);
157         }
158         if (elf->e_phnum != 1) {
159             fprintf(stderr,
160                     "%s: %d program headers (forgot to link with -N?)\n",
161                     prog_name, elf->e_phnum);
162         }
163 
164         e_entry = elf->e_entry;
165 
166         lseek(fd, elf->e_phoff, SEEK_SET);
167         if (read(fd, buf, sizeof(*elf_phdr)) != sizeof(*elf_phdr)) {
168             perror("read");
169             exit(1);
170         }
171 
172         elf_phdr = (struct elf_phdr *) buf;
173         offset   = elf_phdr->p_offset;
174         mem_size = elf_phdr->p_memsz;
175         fil_size = elf_phdr->p_filesz;
176 
177         /* work around ELF bug: */
178         if (elf_phdr->p_vaddr < e_entry) {
179             unsigned long delta = e_entry - elf_phdr->p_vaddr;
180             offset   += delta;
181             mem_size -= delta;
182             fil_size -= delta;
183             elf_phdr->p_vaddr += delta;
184         }
185 
186         if (verbose) {
187             fprintf(stderr, "%s: extracting %#016lx-%#016lx (at %lx)\n",
188                     prog_name, (long) elf_phdr->p_vaddr,
189                     elf_phdr->p_vaddr + fil_size, offset);
190         }
191     } else
192 #endif
193     {
194         aout = (struct exec *) buf;
195 
196         if (!(aout->fh.f_flags & COFF_F_EXEC)) {
197             fprintf(stderr, "%s: %s is not in executable format\n",
198                     prog_name, inname);
199             exit(1);
200         }
201 
202         if (aout->fh.f_opthdr != sizeof(aout->ah)) {
203             fprintf(stderr, "%s: %s has unexpected optional header size\n",
204                     prog_name, inname);
205             exit(1);
206         }
207 
208         if (N_MAGIC(*aout) != OMAGIC) {
209             fprintf(stderr, "%s: %s is not an OMAGIC file\n",
210                     prog_name, inname);
211             exit(1);
212         }
213         offset = N_TXTOFF(*aout);
214         fil_size = aout->ah.tsize + aout->ah.dsize;
215         mem_size = fil_size + aout->ah.bsize;
216 
217         if (verbose) {
218             fprintf(stderr, "%s: extracting %#016lx-%#016lx (at %lx)\n",
219                     prog_name, aout->ah.text_start,
220                     aout->ah.text_start + fil_size, offset);
221         }
222     }
223 
224     if (lseek(fd, offset, SEEK_SET) != offset) {
225         perror("lseek");
226         exit(1);
227     }
228 
229     if (verbose) {
230         fprintf(stderr, "%s: copying %lu byte from %s\n",
231                 prog_name, (unsigned long) fil_size, inname);
232     }
233 
234     tocopy = fil_size;
235     while (tocopy > 0) {
236         n = tocopy;
237         if (n > sizeof(buf)) {
238             n = sizeof(buf);
239         }
240         tocopy -= n;
241         if ((size_t) read(fd, buf, n) != n) {
242             perror("read");
243             exit(1);
244         }
245         do {
246             nwritten = write(ofd, buf, n);
247             if ((ssize_t) nwritten == -1) {
248                 perror("write");
249                 exit(1);
250             }
251             n -= nwritten;
252         } while (n > 0);
253     }
254 
255     if (pad) {
256         mem_size = ((mem_size + pad - 1) / pad) * pad;
257     }
258 
259     tocopy = mem_size - fil_size;
260     if (tocopy > 0) {
261         fprintf(stderr,
262                 "%s: zero-filling bss and aligning to %lu with %lu bytes\n",
263                 prog_name, pad, (unsigned long) tocopy);
264 
265         memset(buf, 0x00, sizeof(buf));
266         do {
267             n = tocopy;
268             if (n > sizeof(buf)) {
269                 n = sizeof(buf);
270             }
271             nwritten = write(ofd, buf, n);
272             if ((ssize_t) nwritten == -1) {
273                 perror("write");
274                 exit(1);
275             }
276             tocopy -= nwritten;
277         } while (tocopy > 0);
278     }
279     return 0;
280 }
281 

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