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alistair23-linux/arch/powerpc/boot/addnote.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

248 lines
6.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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.
*
* 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);
}
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