cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hack-coff.c (2187B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * hack-coff.c - hack the header of an xcoff file to fill in
      4 * a few fields needed by the Open Firmware xcoff loader on
      5 * Power Macs but not initialized by objcopy.
      6 *
      7 * Copyright (C) Paul Mackerras 1997.
      8 */
      9#include <stdio.h>
     10#include <stdlib.h>
     11#include <unistd.h>
     12#include <fcntl.h>
     13#include <string.h>
     14#include "rs6000.h"
     15
     16#define AOUT_MAGIC	0x010b
     17
     18#define get_16be(x)	((((unsigned char *)(x))[0] << 8) \
     19			 + ((unsigned char *)(x))[1])
     20#define put_16be(x, v)	(((unsigned char *)(x))[0] = (v) >> 8, \
     21			 ((unsigned char *)(x))[1] = (v) & 0xff)
     22#define get_32be(x)	((((unsigned char *)(x))[0] << 24) \
     23			 + (((unsigned char *)(x))[1] << 16) \
     24			 + (((unsigned char *)(x))[2] << 8) \
     25			 + ((unsigned char *)(x))[3])
     26
     27int
     28main(int ac, char **av)
     29{
     30    int fd;
     31    int i, nsect;
     32    int aoutsz;
     33    struct external_filehdr fhdr;
     34    AOUTHDR aout;
     35    struct external_scnhdr shdr;
     36
     37    if (ac != 2) {
     38	fprintf(stderr, "Usage: hack-coff coff-file\n");
     39	exit(1);
     40    }
     41    if ((fd = open(av[1], 2)) == -1) {
     42	perror(av[2]);
     43	exit(1);
     44    }
     45    if (read(fd, &fhdr, sizeof(fhdr)) != sizeof(fhdr))
     46	goto readerr;
     47    i = get_16be(fhdr.f_magic);
     48    if (i != U802TOCMAGIC && i != U802WRMAGIC && i != U802ROMAGIC) {
     49	fprintf(stderr, "%s: not an xcoff file\n", av[1]);
     50	exit(1);
     51    }
     52    aoutsz = get_16be(fhdr.f_opthdr);
     53    if (read(fd, &aout, aoutsz) != aoutsz)
     54	goto readerr;
     55    nsect = get_16be(fhdr.f_nscns);
     56    for (i = 0; i < nsect; ++i) {
     57	if (read(fd, &shdr, sizeof(shdr)) != sizeof(shdr))
     58	    goto readerr;
     59	if (strcmp(shdr.s_name, ".text") == 0) {
     60	    put_16be(aout.o_snentry, i+1);
     61	    put_16be(aout.o_sntext, i+1);
     62	} else if (strcmp(shdr.s_name, ".data") == 0) {
     63	    put_16be(aout.o_sndata, i+1);
     64	} else if (strcmp(shdr.s_name, ".bss") == 0) {
     65	    put_16be(aout.o_snbss, i+1);
     66	}
     67    }
     68    put_16be(aout.magic, AOUT_MAGIC);
     69    if (lseek(fd, (long) sizeof(struct external_filehdr), 0) == -1
     70	|| write(fd, &aout, aoutsz) != aoutsz) {
     71	fprintf(stderr, "%s: write error\n", av[1]);
     72	exit(1);
     73    }
     74    close(fd);
     75    exit(0);
     76
     77readerr:
     78    fprintf(stderr, "%s: read error or file too short\n", av[1]);
     79    exit(1);
     80}