1 files changed, 205 insertions, 0 deletions

diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
new file mode 100644
index 000000000000..8041a9845ab7
--- /dev/null
+++ b/arch/powerpc/boot/addnote.c
@@ -0,0 +1,205 @@
+/*
+ * 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.
+ *
+ * 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 */
+char arch[] = "PowerPC";
+
+#define N_DESCR 6
+unsigned int descr[N_DESCR] = {
+        0xffffffff,             /* real-mode = true */
+        0x00c00000,             /* 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 */
+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[512];
+
+#define GET_16BE(off)   ((buf[off] << 8) + (buf[(off)+1]))
+#define GET_32BE(off)   ((GET_16BE(off) << 16) + GET_16BE((off)+2))
+
+#define PUT_16BE(off, v)        (buf[off] = ((v) >> 8) & 0xff, \
+                                 buf[(off) + 1] = (v) & 0xff)
+#define PUT_32BE(off, v)        (PUT_16BE((off), (v) >> 16), \
+                                 PUT_16BE((off) + 2, (v)))
+
+/* Structure of an ELF file */
+#define E_IDENT         0       /* ELF header */
+#define E_PHOFF         28
+#define E_PHENTSIZE     42
+#define E_PHNUM         44
+#define E_HSIZE         52      /* size of ELF header */
+
+#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       4
+#define PH_FILESZ       16
+#define PH_HSIZE        32      /* size of program header */
+
+#define PT_NOTE         4       /* Program header type = note */
+
+#define ELFCLASS32      1
+#define ELFDATA2MSB     2
+
+unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' };
+
+int
+main(int ac, char **av)
+{
+        int fd, n, i;
+        int ph, ps, np;
+        int 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 (n < E_HSIZE || memcmp(&buf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0)
+                goto notelf;
+
+        if (buf[E_IDENT+EI_CLASS] != ELFCLASS32
+            || buf[E_IDENT+EI_DATA] != ELFDATA2MSB) {
+                fprintf(stderr, "%s is not a big-endian 32-bit ELF image\n",
+                        av[1]);
+                exit(1);
+        }
+
+        ph = GET_32BE(E_PHOFF);
+        ps = GET_16BE(E_PHENTSIZE);
+        np = GET_16BE(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_32BE(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_32BE(ph + PH_TYPE, PT_NOTE);
+        PUT_32BE(ph + PH_OFFSET, ns);
+        PUT_32BE(ph + PH_FILESZ, nnote);
+
+        /* fill in the note area we point to */
+        /* XXX we should probably make this a proper section */
+        PUT_32BE(ns, strlen(arch) + 1);
+        PUT_32BE(ns + 4, N_DESCR * 4);
+        PUT_32BE(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_32BE(ph + PH_TYPE, PT_NOTE);
+        PUT_32BE(ph + PH_OFFSET, ns);
+        PUT_32BE(ph + PH_FILESZ, nnote2);
+
+        /* fill in the note area we point to */
+        PUT_32BE(ns, strlen(rpaname) + 1);
+        PUT_32BE(ns + 4, sizeof(rpanote));
+        PUT_32BE(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_16BE(E_PHNUM, np + 2);
+
+        /* write back */
+        lseek(fd, (long) 0, SEEK_SET);
+        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);
+}