1 files changed, 251 insertions, 0 deletions
diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
new file mode 100644
index 000000000..3da3e2b1b
--- /dev/null
+++ b/arch/powerpc/boot/addnote.c
@@ -0,0 +1,251 @@
+/*
+ * 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);
+}