sparc: refactor piggy_32.c
Refactoring to increase readability (a little). - sort includes - spaces around operators - small helpers introduced - added a few comments Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg
David S. Miller
Родитель
f28f3313aa
Коммит
2fe74fa966
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@ -9,7 +9,7 @@
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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@ -18,15 +18,16 @@
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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@ -35,16 +36,19 @@
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* as PROM looks for a.out image only.
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*/
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/* read two bytes as big endian */
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static unsigned short ld2(char *p)
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{
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return (p[0] << 8) | p[1];
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}
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/* read 4 bytes as big endian */
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static unsigned int ld4(char *p)
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{
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return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
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}
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/* save 4 bytes as big endian */
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static void st4(char *p, unsigned int x)
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{
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p[0] = x >> 24;
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@ -53,6 +57,12 @@ static void st4(char *p, unsigned int x)
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p[3] = x;
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}
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static void die(const char *str)
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{
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perror(str);
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exit(1);
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}
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static void usage(void)
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{
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/* fs_img.gz is an image of initial ramdisk. */
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@ -61,10 +71,57 @@ static void usage(void)
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exit(1);
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}
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static void die(char *str)
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static int start_line(const char *line)
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{
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perror (str);
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exit(1);
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if (strcmp(line + 8, " T start\n") == 0)
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return 1;
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else if (strcmp(line + 16, " T start\n") == 0)
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return 1;
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return 0;
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}
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static int end_line(const char *line)
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{
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if (strcmp(line + 8, " A _end\n") == 0)
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return 1;
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else if (strcmp (line + 16, " A _end\n") == 0)
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return 1;
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return 0;
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}
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/*
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* Find address for start and end in System.map.
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* The file looks like this:
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* f0004000 T start
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* f0379f79 A _end
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* 1234567890123456
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* ^coloumn 1
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* There is support for 64 bit addresses too.
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*
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* Return 0 if either start or end is not found
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*/
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static int get_start_end(const char *filename, unsigned int *start, unsigned int *end)
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{
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FILE *map;
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char buffer[1024];
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*start = 0;
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*end = 0;
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map = fopen(filename, "r");
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if (!map)
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die(filename);
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while (fgets(buffer, 1024, map)) {
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if (start_line(buffer))
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*start = strtoul(buffer, NULL, 16);
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else if (end_line(buffer))
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*end = strtoul(buffer, NULL, 16);
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}
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fclose (map);
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if (*start == 0 || *end == 0)
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return 0;
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return 1;
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}
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int main(int argc,char **argv)
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@ -72,33 +129,29 @@ int main(int argc,char **argv)
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static char aout_magic[] = { 0x01, 0x03, 0x01, 0x07 };
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char buffer[1024], *q, *r;
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unsigned int i, j, k, start, end, offset;
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FILE *map;
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struct stat s;
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int image, tail;
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if (argc != 4) usage();
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start = end = 0;
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if (stat (argv[3], &s) < 0) die (argv[3]);
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map = fopen (argv[2], "r");
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if (!map) die(argv[2]);
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while (fgets (buffer, 1024, map)) {
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if (!strcmp (buffer + 8, " T start\n") || !strcmp (buffer + 16, " T start\n"))
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start = strtoul (buffer, NULL, 16);
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else if (!strcmp (buffer + 8, " A _end\n") || !strcmp (buffer + 16, " A _end\n"))
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end = strtoul (buffer, NULL, 16);
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}
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fclose (map);
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if (!start || !end) {
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fprintf (stderr, "Could not determine start and end from System.map\n");
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if (argc != 4)
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usage();
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if (stat (argv[3], &s) < 0)
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die(argv[3]);
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if (!get_start_end(argv[2], &start, &end)) {
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fprintf (stderr, "Could not determine start and end from %s\n", argv[2]);
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exit(1);
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}
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if ((image = open(argv[1],O_RDWR)) < 0) die(argv[1]);
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if (read(image,buffer,512) != 512) die(argv[1]);
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if ((image = open(argv[1], O_RDWR)) < 0)
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die(argv[1]);
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if (read(image, buffer, 512) != 512)
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die(argv[1]);
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if (memcmp (buffer, "\177ELF", 4) == 0) {
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q = buffer + ld4(buffer + 28);
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i = ld4(q + 4) + ld4(buffer + 24) - ld4(q + 8);
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if (lseek(image,i,0) < 0) die("lseek");
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if (read(image,buffer,512) != 512) die(argv[1]);
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if (lseek(image, i, 0) < 0)
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die("lseek");
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if (read(image, buffer, 512) != 512)
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die(argv[1]);
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j = 0;
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} else if (memcmp(buffer, aout_magic, 4) == 0) {
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i = j = 32;
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@ -107,9 +160,11 @@ int main(int argc,char **argv)
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exit(1);
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}
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k = i;
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i += (ld2(buffer + j + 2)<<2) - 512;
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if (lseek(image,i,0) < 0) die("lseek");
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if (read(image,buffer,1024) != 1024) die(argv[1]);
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i += (ld2(buffer + j + 2) << 2) - 512;
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if (lseek(image, i, 0) < 0)
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die("lseek");
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if (read(image, buffer, 1024) != 1024)
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die(argv[1]);
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for (q = buffer, r = q + 512; q < r; q += 4) {
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if (*q == 'H' && q[1] == 'd' && q[2] == 'r' && q[3] == 'S')
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break;
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@ -119,19 +174,26 @@ int main(int argc,char **argv)
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exit(1);
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}
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offset = i + (q - buffer) + 10;
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if (lseek(image, offset, 0) < 0) die ("lseek");
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if (lseek(image, offset, 0) < 0)
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die("lseek");
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st4(buffer, 0);
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st4(buffer + 4, 0x01000000);
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st4(buffer + 8, (end + 32 + 4095) & ~4095);
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st4(buffer + 12, s.st_size);
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if (write(image,buffer+2,14) != 14) die (argv[1]);
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if (lseek(image, k - start + ((end + 32 + 4095) & ~4095), 0) < 0) die ("lseek");
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if ((tail = open(argv[3],O_RDONLY)) < 0) die(argv[3]);
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while ((i = read (tail,buffer,1024)) > 0)
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if (write(image,buffer,i) != i) die (argv[1]);
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if (close(image) < 0) die("close");
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if (close(tail) < 0) die("close");
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return 0;
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if (write(image, buffer + 2, 14) != 14)
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die(argv[1]);
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if (lseek(image, k - start + ((end + 32 + 4095) & ~4095), 0) < 0)
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die("lseek");
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if ((tail = open(argv[3],O_RDONLY)) < 0)
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die(argv[3]);
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while ((i = read (tail, buffer, 1024)) > 0)
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if (write(image, buffer, i) != i)
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die(argv[1]);
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if (close(image) < 0)
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die("close");
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if (close(tail) < 0)
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die("close");
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return 0;
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}
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