248 lines
6.7 KiB
C
248 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Program to hack in a PT_NOTE program header entry in an ELF file.
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* This is needed for OF on RS/6000s to load an image correctly.
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* Note that OF needs a program header entry for the note, not an
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* ELF section.
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*
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* Copyright 2000 Paul Mackerras.
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*
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* Adapted for 64 bit little endian images by Andrew Tauferner.
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*
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* Usage: addnote zImage
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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/* CHRP note section */
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static const char arch[] = "PowerPC";
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#define N_DESCR 6
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unsigned int descr[N_DESCR] = {
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0xffffffff, /* real-mode = true */
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0x02000000, /* real-base, i.e. where we expect OF to be */
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0xffffffff, /* real-size */
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0xffffffff, /* virt-base */
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0xffffffff, /* virt-size */
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0x4000, /* load-base */
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};
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/* RPA note section */
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static const char rpaname[] = "IBM,RPA-Client-Config";
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/*
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* Note: setting ignore_my_client_config *should* mean that OF ignores
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* all the other fields, but there is a firmware bug which means that
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* it looks at the splpar field at least. So these values need to be
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* reasonable.
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*/
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#define N_RPA_DESCR 8
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unsigned int rpanote[N_RPA_DESCR] = {
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0, /* lparaffinity */
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64, /* min_rmo_size */
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0, /* min_rmo_percent */
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40, /* max_pft_size */
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1, /* splpar */
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-1, /* min_load */
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0, /* new_mem_def */
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1, /* ignore_my_client_config */
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};
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#define ROUNDUP(len) (((len) + 3) & ~3)
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unsigned char buf[1024];
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#define ELFDATA2LSB 1
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#define ELFDATA2MSB 2
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static int e_data = ELFDATA2MSB;
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#define ELFCLASS32 1
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#define ELFCLASS64 2
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static int e_class = ELFCLASS32;
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#define GET_16BE(off) ((buf[off] << 8) + (buf[(off)+1]))
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#define GET_32BE(off) ((GET_16BE(off) << 16U) + GET_16BE((off)+2U))
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#define GET_64BE(off) ((((unsigned long long)GET_32BE(off)) << 32ULL) + \
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((unsigned long long)GET_32BE((off)+4ULL)))
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#define PUT_16BE(off, v)(buf[off] = ((v) >> 8) & 0xff, \
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buf[(off) + 1] = (v) & 0xff)
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#define PUT_32BE(off, v)(PUT_16BE((off), (v) >> 16L), PUT_16BE((off) + 2, (v)))
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#define PUT_64BE(off, v)((PUT_32BE((off), (v) >> 32L), \
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PUT_32BE((off) + 4, (v))))
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#define GET_16LE(off) ((buf[off]) + (buf[(off)+1] << 8))
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#define GET_32LE(off) (GET_16LE(off) + (GET_16LE((off)+2U) << 16U))
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#define GET_64LE(off) ((unsigned long long)GET_32LE(off) + \
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(((unsigned long long)GET_32LE((off)+4ULL)) << 32ULL))
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#define PUT_16LE(off, v) (buf[off] = (v) & 0xff, \
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buf[(off) + 1] = ((v) >> 8) & 0xff)
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#define PUT_32LE(off, v) (PUT_16LE((off), (v)), PUT_16LE((off) + 2, (v) >> 16L))
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#define PUT_64LE(off, v) (PUT_32LE((off), (v)), PUT_32LE((off) + 4, (v) >> 32L))
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#define GET_16(off) (e_data == ELFDATA2MSB ? GET_16BE(off) : GET_16LE(off))
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#define GET_32(off) (e_data == ELFDATA2MSB ? GET_32BE(off) : GET_32LE(off))
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#define GET_64(off) (e_data == ELFDATA2MSB ? GET_64BE(off) : GET_64LE(off))
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#define PUT_16(off, v) (e_data == ELFDATA2MSB ? PUT_16BE(off, v) : \
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PUT_16LE(off, v))
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#define PUT_32(off, v) (e_data == ELFDATA2MSB ? PUT_32BE(off, v) : \
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PUT_32LE(off, v))
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#define PUT_64(off, v) (e_data == ELFDATA2MSB ? PUT_64BE(off, v) : \
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PUT_64LE(off, v))
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/* Structure of an ELF file */
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#define E_IDENT 0 /* ELF header */
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#define E_PHOFF (e_class == ELFCLASS32 ? 28 : 32)
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#define E_PHENTSIZE (e_class == ELFCLASS32 ? 42 : 54)
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#define E_PHNUM (e_class == ELFCLASS32 ? 44 : 56)
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#define E_HSIZE (e_class == ELFCLASS32 ? 52 : 64)
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#define EI_MAGIC 0 /* offsets in E_IDENT area */
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#define EI_CLASS 4
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#define EI_DATA 5
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#define PH_TYPE 0 /* ELF program header */
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#define PH_OFFSET (e_class == ELFCLASS32 ? 4 : 8)
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#define PH_FILESZ (e_class == ELFCLASS32 ? 16 : 32)
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#define PH_HSIZE (e_class == ELFCLASS32 ? 32 : 56)
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#define PT_NOTE 4 /* Program header type = note */
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unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' };
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int
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main(int ac, char **av)
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{
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int fd, n, i;
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unsigned long ph, ps, np;
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long nnote, nnote2, ns;
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if (ac != 2) {
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fprintf(stderr, "Usage: %s elf-file\n", av[0]);
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exit(1);
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}
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fd = open(av[1], O_RDWR);
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if (fd < 0) {
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perror(av[1]);
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exit(1);
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}
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nnote = 12 + ROUNDUP(strlen(arch) + 1) + sizeof(descr);
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nnote2 = 12 + ROUNDUP(strlen(rpaname) + 1) + sizeof(rpanote);
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n = read(fd, buf, sizeof(buf));
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if (n < 0) {
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perror("read");
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exit(1);
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}
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if (memcmp(&buf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0)
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goto notelf;
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e_class = buf[E_IDENT+EI_CLASS];
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if (e_class != ELFCLASS32 && e_class != ELFCLASS64)
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goto notelf;
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e_data = buf[E_IDENT+EI_DATA];
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if (e_data != ELFDATA2MSB && e_data != ELFDATA2LSB)
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goto notelf;
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if (n < E_HSIZE)
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goto notelf;
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ph = (e_class == ELFCLASS32 ? GET_32(E_PHOFF) : GET_64(E_PHOFF));
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ps = GET_16(E_PHENTSIZE);
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np = GET_16(E_PHNUM);
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if (ph < E_HSIZE || ps < PH_HSIZE || np < 1)
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goto notelf;
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if (ph + (np + 2) * ps + nnote + nnote2 > n)
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goto nospace;
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for (i = 0; i < np; ++i) {
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if (GET_32(ph + PH_TYPE) == PT_NOTE) {
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fprintf(stderr, "%s already has a note entry\n",
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av[1]);
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exit(0);
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}
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ph += ps;
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}
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/* XXX check that the area we want to use is all zeroes */
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for (i = 0; i < 2 * ps + nnote + nnote2; ++i)
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if (buf[ph + i] != 0)
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goto nospace;
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/* fill in the program header entry */
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ns = ph + 2 * ps;
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PUT_32(ph + PH_TYPE, PT_NOTE);
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if (e_class == ELFCLASS32)
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PUT_32(ph + PH_OFFSET, ns);
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else
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PUT_64(ph + PH_OFFSET, ns);
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if (e_class == ELFCLASS32)
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PUT_32(ph + PH_FILESZ, nnote);
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else
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PUT_64(ph + PH_FILESZ, nnote);
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/* fill in the note area we point to */
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/* XXX we should probably make this a proper section */
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PUT_32(ns, strlen(arch) + 1);
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PUT_32(ns + 4, N_DESCR * 4);
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PUT_32(ns + 8, 0x1275);
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strcpy((char *) &buf[ns + 12], arch);
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ns += 12 + strlen(arch) + 1;
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for (i = 0; i < N_DESCR; ++i, ns += 4)
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PUT_32BE(ns, descr[i]);
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/* fill in the second program header entry and the RPA note area */
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ph += ps;
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PUT_32(ph + PH_TYPE, PT_NOTE);
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if (e_class == ELFCLASS32)
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PUT_32(ph + PH_OFFSET, ns);
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else
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PUT_64(ph + PH_OFFSET, ns);
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if (e_class == ELFCLASS32)
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PUT_32(ph + PH_FILESZ, nnote);
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else
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PUT_64(ph + PH_FILESZ, nnote2);
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/* fill in the note area we point to */
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PUT_32(ns, strlen(rpaname) + 1);
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PUT_32(ns + 4, sizeof(rpanote));
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PUT_32(ns + 8, 0x12759999);
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strcpy((char *) &buf[ns + 12], rpaname);
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ns += 12 + ROUNDUP(strlen(rpaname) + 1);
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for (i = 0; i < N_RPA_DESCR; ++i, ns += 4)
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PUT_32BE(ns, rpanote[i]);
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/* Update the number of program headers */
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PUT_16(E_PHNUM, np + 2);
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/* write back */
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i = lseek(fd, (long) 0, SEEK_SET);
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if (i < 0) {
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perror("lseek");
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exit(1);
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}
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i = write(fd, buf, n);
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if (i < 0) {
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perror("write");
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exit(1);
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}
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if (i < n) {
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fprintf(stderr, "%s: write truncated\n", av[1]);
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exit(1);
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}
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exit(0);
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notelf:
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fprintf(stderr, "%s does not appear to be an ELF file\n", av[1]);
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exit(1);
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nospace:
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fprintf(stderr, "sorry, I can't find space in %s to put the note\n",
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av[1]);
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exit(1);
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}
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