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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [alpha/] [boot/] [tools/] [objstrip.c] - Blame information for rev 1765

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/*
 * arch/alpha/boot/tools/objstrip.c
 *
 * Strip the object file headers/trailers from an executable (ELF or ECOFF).
 *
 * Copyright (C) 1996 David Mosberger-Tang.
 */
/*
 * Converts an ECOFF or ELF object file into a bootable file.  The
 * object file must be a OMAGIC file (i.e., data and bss follow immediatly
 * behind the text).  See DEC "Assembly Language Programmer's Guide"
 * documentation for details.  The SRM boot process is documented in
 * the Alpha AXP Architecture Reference Manual, Second Edition by
 * Richard L. Sites and Richard T. Witek.
 */
#include <stdio.h>
#include <unistd.h>
 
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
 
#include <linux/a.out.h>
#include <linux/coff.h>
#include <linux/param.h>
#include <linux/string.h>
#ifdef __ELF__
# include <asm/elf.h>
# include <linux/elf.h>
#endif
 
/* bootfile size must be multiple of BLOCK_SIZE: */
#define BLOCK_SIZE      512
 
const char * prog_name;
 
 
void
usage (void)
{
    fprintf(stderr,
            "usage: %s [-v] -p file primary\n"
            "       %s [-vb] file [secondary]\n", prog_name, prog_name);
    exit(1);
}
 
 
int
main (int argc, char *argv[])
{
    size_t nwritten, tocopy, n, mem_size, fil_size, pad = 0;
    int fd, ofd, i, j, verbose = 0, primary = 0;
    char buf[8192], *inname;
    struct exec * aout;         /* includes file & aout header */
    long offset;
#ifdef __ELF__
    struct elfhdr *elf;
    struct elf_phdr *elf_phdr;  /* program header */
    unsigned long long e_entry;
#endif
 
    prog_name = argv[0];
 
    for (i = 1; i < argc && argv[i][0] == '-'; ++i) {
        for (j = 1; argv[i][j]; ++j) {
            switch (argv[i][j]) {
              case 'v':
                  verbose = ~verbose;
                  break;
 
              case 'b':
                  pad = BLOCK_SIZE;
                  break;
 
              case 'p':
                  primary = 1;          /* make primary bootblock */
                  break;
            }
        }
    }
 
    if (i >= argc) {
        usage();
    }
    inname = argv[i++];
 
    fd = open(inname, O_RDONLY);
    if (fd == -1) {
        perror("open");
        exit(1);
    }
 
    ofd = 1;
    if (i < argc) {
        ofd = open(argv[i++], O_WRONLY | O_CREAT | O_TRUNC, 0666);
        if (fd == -1) {
            perror("open");
            exit(1);
        }
    }
 
    if (primary) {
        /* generate bootblock for primary loader */
 
        unsigned long bb[64], sum = 0;
        struct stat st;
        off_t size;
        int i;
 
        if (ofd == 1) {
            usage();
        }
 
        if (fstat(fd, &st) == -1) {
            perror("fstat");
            exit(1);
        }
 
        size = (st.st_size + BLOCK_SIZE - 1) & ~(BLOCK_SIZE - 1);
        memset(bb, 0, sizeof(bb));
        strcpy((char *) bb, "Linux SRM bootblock");
        bb[60] = size / BLOCK_SIZE;     /* count */
        bb[61] = 1;                     /* starting sector # */
        bb[62] = 0;                      /* flags---must be 0 */
        for (i = 0; i < 63; ++i) {
            sum += bb[i];
        }
        bb[63] = sum;
        if (write(ofd, bb, sizeof(bb)) != sizeof(bb)) {
            perror("boot-block write");
            exit(1);
        }
        printf("%lu\n", size);
        return 0;
    }
 
    /* read and inspect exec header: */
 
    if (read(fd, buf, sizeof(buf)) < 0) {
        perror("read");
        exit(1);
    }
 
#ifdef __ELF__
    elf = (struct elfhdr *) buf;
 
    if (elf->e_ident[0] == 0x7f && strncmp(elf->e_ident + 1, "ELF", 3) == 0) {
        if (elf->e_type != ET_EXEC) {
            fprintf(stderr, "%s: %s is not an ELF executable\n",
                    prog_name, inname);
            exit(1);
        }
        if (!elf_check_arch(elf->e_machine)) {
            fprintf(stderr, "%s: is not for this processor (e_machine=%d)\n",
                    prog_name, elf->e_machine);
            exit(1);
        }
        if (elf->e_phnum != 1) {
            fprintf(stderr,
                    "%s: %d program headers (forgot to link with -N?)\n",
                    prog_name, elf->e_phnum);
        }
 
        e_entry = elf->e_entry;
 
        lseek(fd, elf->e_phoff, SEEK_SET);
        if (read(fd, buf, sizeof(*elf_phdr)) != sizeof(*elf_phdr)) {
            perror("read");
            exit(1);
        }
 
        elf_phdr = (struct elf_phdr *) buf;
        offset   = elf_phdr->p_offset;
        mem_size = elf_phdr->p_memsz;
        fil_size = elf_phdr->p_filesz;
 
        /* work around ELF bug: */
        if (elf_phdr->p_vaddr < e_entry) {
            unsigned long delta = e_entry - elf_phdr->p_vaddr;
            offset   += delta;
            mem_size -= delta;
            fil_size -= delta;
            elf_phdr->p_vaddr += delta;
        }
 
        if (verbose) {
            fprintf(stderr, "%s: extracting %#016lx-%#016lx (at %lx)\n",
                    prog_name, (long) elf_phdr->p_vaddr,
                    elf_phdr->p_vaddr + fil_size, offset);
        }
    } else
#endif
    {
        aout = (struct exec *) buf;
 
        if (!(aout->fh.f_flags & COFF_F_EXEC)) {
            fprintf(stderr, "%s: %s is not in executable format\n",
                    prog_name, inname);
            exit(1);
        }
 
        if (aout->fh.f_opthdr != sizeof(aout->ah)) {
            fprintf(stderr, "%s: %s has unexpected optional header size\n",
                    prog_name, inname);
            exit(1);
        }
 
        if (N_MAGIC(*aout) != OMAGIC) {
            fprintf(stderr, "%s: %s is not an OMAGIC file\n",
                    prog_name, inname);
            exit(1);
        }
        offset = N_TXTOFF(*aout);
        fil_size = aout->ah.tsize + aout->ah.dsize;
        mem_size = fil_size + aout->ah.bsize;
 
        if (verbose) {
            fprintf(stderr, "%s: extracting %#016lx-%#016lx (at %lx)\n",
                    prog_name, aout->ah.text_start,
                    aout->ah.text_start + fil_size, offset);
        }
    }
 
    if (lseek(fd, offset, SEEK_SET) != offset) {
        perror("lseek");
        exit(1);
    }
 
    if (verbose) {
        fprintf(stderr, "%s: copying %lu byte from %s\n",
                prog_name, (unsigned long) fil_size, inname);
    }
 
    tocopy = fil_size;
    while (tocopy > 0) {
        n = tocopy;
        if (n > sizeof(buf)) {
            n = sizeof(buf);
        }
        tocopy -= n;
        if ((size_t) read(fd, buf, n) != n) {
            perror("read");
            exit(1);
        }
        do {
            nwritten = write(ofd, buf, n);
            if ((ssize_t) nwritten == -1) {
                perror("write");
                exit(1);
            }
            n -= nwritten;
        } while (n > 0);
    }
 
    if (pad) {
        mem_size = ((mem_size + pad - 1) / pad) * pad;
    }
 
    tocopy = mem_size - fil_size;
    if (tocopy > 0) {
        fprintf(stderr,
                "%s: zero-filling bss and aligning to %lu with %lu bytes\n",
                prog_name, pad, (unsigned long) tocopy);
 
        memset(buf, 0x00, sizeof(buf));
        do {
            n = tocopy;
            if (n > sizeof(buf)) {
                n = sizeof(buf);
            }
            nwritten = write(ofd, buf, n);
            if ((ssize_t) nwritten == -1) {
                perror("write");
                exit(1);
            }
            tocopy -= nwritten;
        } while (tocopy > 0);
    }
    return 0;
}

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [alpha/] [boot/] [tools/] [objstrip.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	199	simons	`/*`
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 immediatly`
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 <unistd.h>`
18
19			`#include <sys/fcntl.h>`
20			`#include <sys/stat.h>`
21			`#include <sys/types.h>`
22
23			`#include <linux/a.out.h>`
24			`#include <linux/coff.h>`
25			`#include <linux/param.h>`
26			`#include <linux/string.h>`
27			`#ifdef __ELF__`
28			`# include <asm/elf.h>`
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			`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 (fd == -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(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->e_machine)) {`
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			`}`