powerpc/boot: Add 64bit and little endian support to addnote

It could certainly be improved using Elf macros and byteswapping
routines, but the initial version of the code is organised to be a
single file program with limited dependencies. yaboot is the same.

Please scream if you want a total rewrite.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 85 insertions, 43 deletions

diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
index 349b5530d2c4..9d9f6f334d3c 100644
--- a/arch/powerpc/boot/addnote.c
+++ b/arch/powerpc/boot/addnote.c
@@ -6,6 +6,8 @@
  *
  * 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
@@ -55,36 +57,61 @@ unsigned int rpanote[N_RPA_DESCR] = {
 
 #define ROUNDUP(len)    (((len) + 3) & ~3)
 
-unsigned char buf[512];
+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) << 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)))
+#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         28
-#define E_PHENTSIZE     42
-#define E_PHNUM         44
-#define E_HSIZE         52      /* size of 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       4
-#define PH_FILESZ       16
-#define PH_HSIZE        32      /* size of 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 */
 
-#define ELFCLASS32      1
-#define ELFDATA2MSB     2
 
 unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' };
 
@@ -92,8 +119,8 @@ int
 main(int ac, char **av)
 {
         int fd, n, i;
-        int ph, ps, np;
-        int nnote, nnote2, ns;
+        unsigned long ph, ps, np;
+        long nnote, nnote2, ns;
 
         if (ac != 2) {
                 fprintf(stderr, "Usage: %s elf-file\n", av[0]);
@@ -114,26 +141,27 @@ main(int ac, char **av)
                 exit(1);
         }
 
-        if (n < E_HSIZE || memcmp(&buf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0)
+        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;
 
-        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);
+        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_32BE(ph + PH_TYPE) == PT_NOTE) {
+                if (GET_32(ph + PH_TYPE) == PT_NOTE) {
                         fprintf(stderr, "%s already has a note entry\n",
                                 av[1]);
                         exit(0);
@@ -148,15 +176,22 @@ main(int ac, char **av)
 
         /* 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);
+        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_32BE(ns, strlen(arch) + 1);
-        PUT_32BE(ns + 4, N_DESCR * 4);
-        PUT_32BE(ns + 8, 0x1275);
+        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)
@@ -164,21 +199,28 @@ main(int ac, char **av)
 
         /* 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);
+        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_32BE(ns, strlen(rpaname) + 1);
-        PUT_32BE(ns + 4, sizeof(rpanote));
-        PUT_32BE(ns + 8, 0x12759999);
+        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_16BE(E_PHNUM, np + 2);
+        PUT_16(E_PHNUM, np + 2);
 
         /* write back */
         lseek(fd, (long) 0, SEEK_SET);