252 lines
6.9 KiB
C
252 lines
6.9 KiB
C
/*
|
|
* Program to hack in a PT_NOTE program header entry in an ELF file.
|
|
* This is needed for OF on RS/6000s to load an image correctly.
|
|
* Note that OF needs a program header entry for the note, not an
|
|
* ELF section.
|
|
*
|
|
* Copyright 2000 Paul Mackerras.
|
|
*
|
|
* Adapted for 64 bit little endian images by Andrew Tauferner.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Usage: addnote zImage
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
/* CHRP note section */
|
|
static const char arch[] = "PowerPC";
|
|
|
|
#define N_DESCR 6
|
|
unsigned int descr[N_DESCR] = {
|
|
0xffffffff, /* real-mode = true */
|
|
0x02000000, /* real-base, i.e. where we expect OF to be */
|
|
0xffffffff, /* real-size */
|
|
0xffffffff, /* virt-base */
|
|
0xffffffff, /* virt-size */
|
|
0x4000, /* load-base */
|
|
};
|
|
|
|
/* RPA note section */
|
|
static const char rpaname[] = "IBM,RPA-Client-Config";
|
|
|
|
/*
|
|
* Note: setting ignore_my_client_config *should* mean that OF ignores
|
|
* all the other fields, but there is a firmware bug which means that
|
|
* it looks at the splpar field at least. So these values need to be
|
|
* reasonable.
|
|
*/
|
|
#define N_RPA_DESCR 8
|
|
unsigned int rpanote[N_RPA_DESCR] = {
|
|
0, /* lparaffinity */
|
|
64, /* min_rmo_size */
|
|
0, /* min_rmo_percent */
|
|
40, /* max_pft_size */
|
|
1, /* splpar */
|
|
-1, /* min_load */
|
|
0, /* new_mem_def */
|
|
1, /* ignore_my_client_config */
|
|
};
|
|
|
|
#define ROUNDUP(len) (((len) + 3) & ~3)
|
|
|
|
unsigned char buf[1024];
|
|
#define ELFDATA2LSB 1
|
|
#define ELFDATA2MSB 2
|
|
static int e_data = ELFDATA2MSB;
|
|
#define ELFCLASS32 1
|
|
#define ELFCLASS64 2
|
|
static int e_class = ELFCLASS32;
|
|
|
|
#define GET_16BE(off) ((buf[off] << 8) + (buf[(off)+1]))
|
|
#define GET_32BE(off) ((GET_16BE(off) << 16U) + GET_16BE((off)+2U))
|
|
#define GET_64BE(off) ((((unsigned long long)GET_32BE(off)) << 32ULL) + \
|
|
((unsigned long long)GET_32BE((off)+4ULL)))
|
|
#define PUT_16BE(off, v)(buf[off] = ((v) >> 8) & 0xff, \
|
|
buf[(off) + 1] = (v) & 0xff)
|
|
#define PUT_32BE(off, v)(PUT_16BE((off), (v) >> 16L), PUT_16BE((off) + 2, (v)))
|
|
#define PUT_64BE(off, v)((PUT_32BE((off), (v) >> 32L), \
|
|
PUT_32BE((off) + 4, (v))))
|
|
|
|
#define GET_16LE(off) ((buf[off]) + (buf[(off)+1] << 8))
|
|
#define GET_32LE(off) (GET_16LE(off) + (GET_16LE((off)+2U) << 16U))
|
|
#define GET_64LE(off) ((unsigned long long)GET_32LE(off) + \
|
|
(((unsigned long long)GET_32LE((off)+4ULL)) << 32ULL))
|
|
#define PUT_16LE(off, v) (buf[off] = (v) & 0xff, \
|
|
buf[(off) + 1] = ((v) >> 8) & 0xff)
|
|
#define PUT_32LE(off, v) (PUT_16LE((off), (v)), PUT_16LE((off) + 2, (v) >> 16L))
|
|
#define PUT_64LE(off, v) (PUT_32LE((off), (v)), PUT_32LE((off) + 4, (v) >> 32L))
|
|
|
|
#define GET_16(off) (e_data == ELFDATA2MSB ? GET_16BE(off) : GET_16LE(off))
|
|
#define GET_32(off) (e_data == ELFDATA2MSB ? GET_32BE(off) : GET_32LE(off))
|
|
#define GET_64(off) (e_data == ELFDATA2MSB ? GET_64BE(off) : GET_64LE(off))
|
|
#define PUT_16(off, v) (e_data == ELFDATA2MSB ? PUT_16BE(off, v) : \
|
|
PUT_16LE(off, v))
|
|
#define PUT_32(off, v) (e_data == ELFDATA2MSB ? PUT_32BE(off, v) : \
|
|
PUT_32LE(off, v))
|
|
#define PUT_64(off, v) (e_data == ELFDATA2MSB ? PUT_64BE(off, v) : \
|
|
PUT_64LE(off, v))
|
|
|
|
/* Structure of an ELF file */
|
|
#define E_IDENT 0 /* ELF header */
|
|
#define E_PHOFF (e_class == ELFCLASS32 ? 28 : 32)
|
|
#define E_PHENTSIZE (e_class == ELFCLASS32 ? 42 : 54)
|
|
#define E_PHNUM (e_class == ELFCLASS32 ? 44 : 56)
|
|
#define E_HSIZE (e_class == ELFCLASS32 ? 52 : 64)
|
|
|
|
#define EI_MAGIC 0 /* offsets in E_IDENT area */
|
|
#define EI_CLASS 4
|
|
#define EI_DATA 5
|
|
|
|
#define PH_TYPE 0 /* ELF program header */
|
|
#define PH_OFFSET (e_class == ELFCLASS32 ? 4 : 8)
|
|
#define PH_FILESZ (e_class == ELFCLASS32 ? 16 : 32)
|
|
#define PH_HSIZE (e_class == ELFCLASS32 ? 32 : 56)
|
|
|
|
#define PT_NOTE 4 /* Program header type = note */
|
|
|
|
|
|
unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' };
|
|
|
|
int
|
|
main(int ac, char **av)
|
|
{
|
|
int fd, n, i;
|
|
unsigned long ph, ps, np;
|
|
long nnote, nnote2, ns;
|
|
|
|
if (ac != 2) {
|
|
fprintf(stderr, "Usage: %s elf-file\n", av[0]);
|
|
exit(1);
|
|
}
|
|
fd = open(av[1], O_RDWR);
|
|
if (fd < 0) {
|
|
perror(av[1]);
|
|
exit(1);
|
|
}
|
|
|
|
nnote = 12 + ROUNDUP(strlen(arch) + 1) + sizeof(descr);
|
|
nnote2 = 12 + ROUNDUP(strlen(rpaname) + 1) + sizeof(rpanote);
|
|
|
|
n = read(fd, buf, sizeof(buf));
|
|
if (n < 0) {
|
|
perror("read");
|
|
exit(1);
|
|
}
|
|
|
|
if (memcmp(&buf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0)
|
|
goto notelf;
|
|
e_class = buf[E_IDENT+EI_CLASS];
|
|
if (e_class != ELFCLASS32 && e_class != ELFCLASS64)
|
|
goto notelf;
|
|
e_data = buf[E_IDENT+EI_DATA];
|
|
if (e_data != ELFDATA2MSB && e_data != ELFDATA2LSB)
|
|
goto notelf;
|
|
if (n < E_HSIZE)
|
|
goto notelf;
|
|
|
|
ph = (e_class == ELFCLASS32 ? GET_32(E_PHOFF) : GET_64(E_PHOFF));
|
|
ps = GET_16(E_PHENTSIZE);
|
|
np = GET_16(E_PHNUM);
|
|
if (ph < E_HSIZE || ps < PH_HSIZE || np < 1)
|
|
goto notelf;
|
|
if (ph + (np + 2) * ps + nnote + nnote2 > n)
|
|
goto nospace;
|
|
|
|
for (i = 0; i < np; ++i) {
|
|
if (GET_32(ph + PH_TYPE) == PT_NOTE) {
|
|
fprintf(stderr, "%s already has a note entry\n",
|
|
av[1]);
|
|
exit(0);
|
|
}
|
|
ph += ps;
|
|
}
|
|
|
|
/* XXX check that the area we want to use is all zeroes */
|
|
for (i = 0; i < 2 * ps + nnote + nnote2; ++i)
|
|
if (buf[ph + i] != 0)
|
|
goto nospace;
|
|
|
|
/* fill in the program header entry */
|
|
ns = ph + 2 * ps;
|
|
PUT_32(ph + PH_TYPE, PT_NOTE);
|
|
if (e_class == ELFCLASS32)
|
|
PUT_32(ph + PH_OFFSET, ns);
|
|
else
|
|
PUT_64(ph + PH_OFFSET, ns);
|
|
|
|
if (e_class == ELFCLASS32)
|
|
PUT_32(ph + PH_FILESZ, nnote);
|
|
else
|
|
PUT_64(ph + PH_FILESZ, nnote);
|
|
|
|
/* fill in the note area we point to */
|
|
/* XXX we should probably make this a proper section */
|
|
PUT_32(ns, strlen(arch) + 1);
|
|
PUT_32(ns + 4, N_DESCR * 4);
|
|
PUT_32(ns + 8, 0x1275);
|
|
strcpy((char *) &buf[ns + 12], arch);
|
|
ns += 12 + strlen(arch) + 1;
|
|
for (i = 0; i < N_DESCR; ++i, ns += 4)
|
|
PUT_32BE(ns, descr[i]);
|
|
|
|
/* fill in the second program header entry and the RPA note area */
|
|
ph += ps;
|
|
PUT_32(ph + PH_TYPE, PT_NOTE);
|
|
if (e_class == ELFCLASS32)
|
|
PUT_32(ph + PH_OFFSET, ns);
|
|
else
|
|
PUT_64(ph + PH_OFFSET, ns);
|
|
|
|
if (e_class == ELFCLASS32)
|
|
PUT_32(ph + PH_FILESZ, nnote);
|
|
else
|
|
PUT_64(ph + PH_FILESZ, nnote2);
|
|
|
|
/* fill in the note area we point to */
|
|
PUT_32(ns, strlen(rpaname) + 1);
|
|
PUT_32(ns + 4, sizeof(rpanote));
|
|
PUT_32(ns + 8, 0x12759999);
|
|
strcpy((char *) &buf[ns + 12], rpaname);
|
|
ns += 12 + ROUNDUP(strlen(rpaname) + 1);
|
|
for (i = 0; i < N_RPA_DESCR; ++i, ns += 4)
|
|
PUT_32BE(ns, rpanote[i]);
|
|
|
|
/* Update the number of program headers */
|
|
PUT_16(E_PHNUM, np + 2);
|
|
|
|
/* write back */
|
|
i = lseek(fd, (long) 0, SEEK_SET);
|
|
if (i < 0) {
|
|
perror("lseek");
|
|
exit(1);
|
|
}
|
|
i = write(fd, buf, n);
|
|
if (i < 0) {
|
|
perror("write");
|
|
exit(1);
|
|
}
|
|
if (i < n) {
|
|
fprintf(stderr, "%s: write truncated\n", av[1]);
|
|
exit(1);
|
|
}
|
|
|
|
exit(0);
|
|
|
|
notelf:
|
|
fprintf(stderr, "%s does not appear to be an ELF file\n", av[1]);
|
|
exit(1);
|
|
|
|
nospace:
|
|
fprintf(stderr, "sorry, I can't find space in %s to put the note\n",
|
|
av[1]);
|
|
exit(1);
|
|
}
|