summaryrefslogtreecommitdiff
path: root/arch/powerpc/boot/addnote.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/boot/addnote.c')
-rw-r--r--arch/powerpc/boot/addnote.c144
1 files changed, 108 insertions, 36 deletions
diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
index b1e5611b2ab1..dcc9ab2ca823 100644
--- a/arch/powerpc/boot/addnote.c
+++ b/arch/powerpc/boot/addnote.c
@@ -11,7 +11,12 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
- * Usage: addnote zImage
+ * Usage: addnote zImage [note.elf]
+ *
+ * If note.elf is supplied, it is the name of an ELF file that contains
+ * an RPA note to use instead of the built-in one. Alternatively, the
+ * note.elf file may be empty, in which case the built-in RPA note is
+ * used (this is to simplify how this is invoked from the wrapper script).
*/
#include <stdio.h>
#include <stdlib.h>
@@ -43,27 +48,29 @@ char rpaname[] = "IBM,RPA-Client-Config";
*/
#define N_RPA_DESCR 8
unsigned int rpanote[N_RPA_DESCR] = {
- 0, /* lparaffinity */
- 64, /* min_rmo_size */
+ 1, /* lparaffinity */
+ 128, /* min_rmo_size */
0, /* min_rmo_percent */
- 40, /* max_pft_size */
+ 46, /* max_pft_size */
1, /* splpar */
-1, /* min_load */
- 0, /* new_mem_def */
- 1, /* ignore_my_client_config */
+ 1, /* new_mem_def */
+ 0, /* ignore_my_client_config */
};
#define ROUNDUP(len) (((len) + 3) & ~3)
unsigned char buf[512];
+unsigned char notebuf[512];
-#define GET_16BE(off) ((buf[off] << 8) + (buf[(off)+1]))
-#define GET_32BE(off) ((GET_16BE(off) << 16) + GET_16BE((off)+2))
+#define GET_16BE(b, off) (((b)[off] << 8) + ((b)[(off)+1]))
+#define GET_32BE(b, off) ((GET_16BE((b), (off)) << 16) + \
+ GET_16BE((b), (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 PUT_16BE(b, off, v) ((b)[off] = ((v) >> 8) & 0xff, \
+ (b)[(off) + 1] = (v) & 0xff)
+#define PUT_32BE(b, off, v) (PUT_16BE((b), (off), (v) >> 16), \
+ PUT_16BE((b), (off) + 2, (v)))
/* Structure of an ELF file */
#define E_IDENT 0 /* ELF header */
@@ -88,15 +95,71 @@ unsigned char buf[512];
unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' };
+unsigned char *read_rpanote(const char *fname, int *nnp)
+{
+ int notefd, nr, i;
+ int ph, ps, np;
+ int note, notesize;
+
+ notefd = open(fname, O_RDONLY);
+ if (notefd < 0) {
+ perror(fname);
+ exit(1);
+ }
+ nr = read(notefd, notebuf, sizeof(notebuf));
+ if (nr < 0) {
+ perror("read note");
+ exit(1);
+ }
+ if (nr == 0) /* empty file */
+ return NULL;
+ if (nr < E_HSIZE ||
+ memcmp(&notebuf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0 ||
+ notebuf[E_IDENT+EI_CLASS] != ELFCLASS32 ||
+ notebuf[E_IDENT+EI_DATA] != ELFDATA2MSB)
+ goto notelf;
+ close(notefd);
+
+ /* now look for the RPA-note */
+ ph = GET_32BE(notebuf, E_PHOFF);
+ ps = GET_16BE(notebuf, E_PHENTSIZE);
+ np = GET_16BE(notebuf, E_PHNUM);
+ if (ph < E_HSIZE || ps < PH_HSIZE || np < 1)
+ goto notelf;
+
+ for (i = 0; i < np; ++i, ph += ps) {
+ if (GET_32BE(notebuf, ph + PH_TYPE) != PT_NOTE)
+ continue;
+ note = GET_32BE(notebuf, ph + PH_OFFSET);
+ notesize = GET_32BE(notebuf, ph + PH_FILESZ);
+ if (notesize < 34 || note + notesize > nr)
+ continue;
+ if (GET_32BE(notebuf, note) != strlen(rpaname) + 1 ||
+ GET_32BE(notebuf, note + 8) != 0x12759999 ||
+ strcmp((char *)&notebuf[note + 12], rpaname) != 0)
+ continue;
+ /* looks like an RPA note, return it */
+ *nnp = notesize;
+ return &notebuf[note];
+ }
+ /* no RPA note found */
+ return NULL;
+
+ notelf:
+ fprintf(stderr, "%s is not a big-endian 32-bit ELF image\n", fname);
+ exit(1);
+}
+
int
main(int ac, char **av)
{
int fd, n, i;
int ph, ps, np;
int nnote, nnote2, ns;
+ unsigned char *rpap;
- if (ac != 2) {
- fprintf(stderr, "Usage: %s elf-file\n", av[0]);
+ if (ac != 2 && ac != 3) {
+ fprintf(stderr, "Usage: %s elf-file [rpanote.elf]\n", av[0]);
exit(1);
}
fd = open(av[1], O_RDWR);
@@ -107,6 +170,7 @@ main(int ac, char **av)
nnote = 12 + ROUNDUP(strlen(arch) + 1) + sizeof(descr);
nnote2 = 12 + ROUNDUP(strlen(rpaname) + 1) + sizeof(rpanote);
+ rpap = NULL;
n = read(fd, buf, sizeof(buf));
if (n < 0) {
@@ -124,16 +188,19 @@ main(int ac, char **av)
exit(1);
}
- ph = GET_32BE(E_PHOFF);
- ps = GET_16BE(E_PHENTSIZE);
- np = GET_16BE(E_PHNUM);
+ if (ac == 3)
+ rpap = read_rpanote(av[2], &nnote2);
+
+ ph = GET_32BE(buf, E_PHOFF);
+ ps = GET_16BE(buf, E_PHENTSIZE);
+ np = GET_16BE(buf, 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_32BE(buf, ph + PH_TYPE) == PT_NOTE) {
fprintf(stderr, "%s already has a note entry\n",
av[1]);
exit(0);
@@ -148,37 +215,42 @@ 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_32BE(buf, ph + PH_TYPE, PT_NOTE);
+ PUT_32BE(buf, ph + PH_OFFSET, ns);
+ PUT_32BE(buf, 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_32BE(buf, ns, strlen(arch) + 1);
+ PUT_32BE(buf, ns + 4, N_DESCR * 4);
+ PUT_32BE(buf, 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]);
+ PUT_32BE(buf, 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);
+ PUT_32BE(buf, ph + PH_TYPE, PT_NOTE);
+ PUT_32BE(buf, ph + PH_OFFSET, ns);
+ PUT_32BE(buf, 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]);
+ if (rpap) {
+ /* RPA note supplied in file, just copy the whole thing over */
+ memcpy(buf + ns, rpap, nnote2);
+ } else {
+ PUT_32BE(buf, ns, strlen(rpaname) + 1);
+ PUT_32BE(buf, ns + 4, sizeof(rpanote));
+ PUT_32BE(buf, 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(buf, ns, rpanote[i]);
+ }
/* Update the number of program headers */
- PUT_16BE(E_PHNUM, np + 2);
+ PUT_16BE(buf, E_PHNUM, np + 2);
/* write back */
lseek(fd, (long) 0, SEEK_SET);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-25 17:50:39 +0300