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265 lines
6.1 KiB
265 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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Simple utility to make a single-image install kernel with initial ramdisk |
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for Sparc tftpbooting without need to set up nfs. |
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Copyright (C) 1996,1997 Jakub Jelinek ([email protected]) |
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Pete Zaitcev <[email protected]> endian fixes for cross-compiles, 2000. |
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Copyright (C) 2011 Sam Ravnborg <[email protected]> |
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*/ |
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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 <stdio.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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/* |
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* Note: run this on an a.out kernel (use elftoaout for it), |
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* as PROM looks for a.out image only. |
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*/ |
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#define AOUT_TEXT_OFFSET 32 |
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static int is64bit = 0; |
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/* align to power-of-two size */ |
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static int align(int n) |
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{ |
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if (is64bit) |
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return (n + 0x1fff) & ~0x1fff; |
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else |
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return (n + 0xfff) & ~0xfff; |
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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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/* 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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p[1] = x >> 16; |
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p[2] = x >> 8; |
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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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fprintf(stderr, "Usage: piggyback bits vmlinux.aout System.map fs_img.gz\n"); |
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fprintf(stderr, "\tKernel image will be modified in place.\n"); |
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exit(1); |
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} |
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static int start_line(const char *line) |
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{ |
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if (strcmp(line + 10, " _start\n") == 0) |
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return 1; |
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else if (strcmp(line + 18, " _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 + 10, " _end\n") == 0) |
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return 1; |
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else if (strcmp (line + 18, " _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 ... _start |
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* f0379f79 ... _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, |
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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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#define LOOKBACK (128 * 4) |
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#define BUFSIZE 1024 |
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/* |
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* Find the HdrS entry from head_32/head_64. |
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* We check if it is at the beginning of the file (sparc64 case) |
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* and if not we search for it. |
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* When we search do so in steps of 4 as HdrS is on a 4-byte aligned |
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* address (it is on same alignment as sparc instructions) |
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* Return the offset to the HdrS entry (as off_t) |
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*/ |
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static off_t get_hdrs_offset(int kernelfd, const char *filename) |
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{ |
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char buffer[BUFSIZE]; |
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off_t offset; |
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int i; |
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if (lseek(kernelfd, 0, SEEK_SET) < 0) |
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die("lseek"); |
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if (read(kernelfd, buffer, BUFSIZE) != BUFSIZE) |
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die(filename); |
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if (buffer[40] == 'H' && buffer[41] == 'd' && |
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buffer[42] == 'r' && buffer[43] == 'S') { |
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return 40; |
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} else { |
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/* Find the gokernel label */ |
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/* Decode offset from branch instruction */ |
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offset = ld2(buffer + AOUT_TEXT_OFFSET + 2) << 2; |
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/* Go back 512 bytes so we do not miss HdrS */ |
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offset -= LOOKBACK; |
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/* skip a.out header */ |
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offset += AOUT_TEXT_OFFSET; |
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if (offset < 0) { |
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errno = -EINVAL; |
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die("Calculated a negative offset, probably elftoaout generated an invalid image. Did you use a recent elftoaout ?"); |
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} |
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if (lseek(kernelfd, offset, SEEK_SET) < 0) |
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die("lseek"); |
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if (read(kernelfd, buffer, BUFSIZE) != BUFSIZE) |
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die(filename); |
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for (i = 0; i < LOOKBACK; i += 4) { |
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if (buffer[i + 0] == 'H' && buffer[i + 1] == 'd' && |
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buffer[i + 2] == 'r' && buffer[i + 3] == 'S') { |
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return offset + i; |
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} |
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} |
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} |
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fprintf (stderr, "Couldn't find headers signature in %s\n", filename); |
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exit(1); |
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} |
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int main(int argc,char **argv) |
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{ |
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static char aout_magic[] = { 0x01, 0x03, 0x01, 0x07 }; |
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char buffer[1024]; |
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unsigned int i, start, end; |
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off_t offset; |
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struct stat s; |
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int image, tail; |
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if (argc != 5) |
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usage(); |
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if (strcmp(argv[1], "64") == 0) |
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is64bit = 1; |
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if (stat (argv[4], &s) < 0) |
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die(argv[4]); |
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if (!get_start_end(argv[3], &start, &end)) { |
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fprintf(stderr, "Could not determine start and end from %s\n", |
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argv[3]); |
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exit(1); |
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} |
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if ((image = open(argv[2], O_RDWR)) < 0) |
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die(argv[2]); |
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if (read(image, buffer, 512) != 512) |
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die(argv[2]); |
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if (memcmp(buffer, aout_magic, 4) != 0) { |
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fprintf (stderr, "Not a.out. Don't blame me.\n"); |
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exit(1); |
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} |
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/* |
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* We need to fill in values for |
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* sparc_ramdisk_image + sparc_ramdisk_size |
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* To locate these symbols search for the "HdrS" text which appear |
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* in the image a little before the gokernel symbol. |
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* See definition of these in init_32.S |
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*/ |
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offset = get_hdrs_offset(image, argv[2]); |
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/* skip HdrS + LINUX_VERSION_CODE + HdrS version */ |
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offset += 10; |
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if (lseek(image, offset, 0) < 0) |
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die("lseek"); |
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/* |
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* root_flags = 0 |
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* root_dev = 1 (RAMDISK_MAJOR) |
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* ram_flags = 0 |
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* sparc_ramdisk_image = "PAGE aligned address after _end") |
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* sparc_ramdisk_size = size of image |
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*/ |
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st4(buffer, 0); |
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st4(buffer + 4, 0x01000000); |
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st4(buffer + 8, align(end + 32)); |
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st4(buffer + 12, s.st_size); |
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if (write(image, buffer + 2, 14) != 14) |
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die(argv[2]); |
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/* For sparc64 update a_text and clear a_data + a_bss */ |
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if (is64bit) |
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{ |
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if (lseek(image, 4, 0) < 0) |
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die("lseek"); |
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/* a_text */ |
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st4(buffer, align(end + 32 + 8191) - (start & ~0x3fffffUL) + |
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s.st_size); |
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/* a_data */ |
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st4(buffer + 4, 0); |
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/* a_bss */ |
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st4(buffer + 8, 0); |
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if (write(image, buffer, 12) != 12) |
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die(argv[2]); |
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} |
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/* seek page aligned boundary in the image file and add boot image */ |
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if (lseek(image, AOUT_TEXT_OFFSET - start + align(end + 32), 0) < 0) |
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die("lseek"); |
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if ((tail = open(argv[4], O_RDONLY)) < 0) |
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die(argv[4]); |
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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[2]); |
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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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