summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/boot/hack-coff.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/boot/hack-coff.c')
-rw-r--r--arch/powerpc/boot/hack-coff.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/powerpc/boot/hack-coff.c b/arch/powerpc/boot/hack-coff.c
new file mode 100644
index 000000000..a010e124a
--- /dev/null
+++ b/arch/powerpc/boot/hack-coff.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * hack-coff.c - hack the header of an xcoff file to fill in
+ * a few fields needed by the Open Firmware xcoff loader on
+ * Power Macs but not initialized by objcopy.
+ *
+ * Copyright (C) Paul Mackerras 1997.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include "rs6000.h"
+
+#define AOUT_MAGIC 0x010b
+
+#define get_16be(x) ((((unsigned char *)(x))[0] << 8) \
+ + ((unsigned char *)(x))[1])
+#define put_16be(x, v) (((unsigned char *)(x))[0] = (v) >> 8, \
+ ((unsigned char *)(x))[1] = (v) & 0xff)
+#define get_32be(x) ((((unsigned char *)(x))[0] << 24) \
+ + (((unsigned char *)(x))[1] << 16) \
+ + (((unsigned char *)(x))[2] << 8) \
+ + ((unsigned char *)(x))[3])
+
+int
+main(int ac, char **av)
+{
+ int fd;
+ int i, nsect;
+ int aoutsz;
+ struct external_filehdr fhdr;
+ AOUTHDR aout;
+ struct external_scnhdr shdr;
+
+ if (ac != 2) {
+ fprintf(stderr, "Usage: hack-coff coff-file\n");
+ exit(1);
+ }
+ if ((fd = open(av[1], 2)) == -1) {
+ perror(av[2]);
+ exit(1);
+ }
+ if (read(fd, &fhdr, sizeof(fhdr)) != sizeof(fhdr))
+ goto readerr;
+ i = get_16be(fhdr.f_magic);
+ if (i != U802TOCMAGIC && i != U802WRMAGIC && i != U802ROMAGIC) {
+ fprintf(stderr, "%s: not an xcoff file\n", av[1]);
+ exit(1);
+ }
+ aoutsz = get_16be(fhdr.f_opthdr);
+ if (read(fd, &aout, aoutsz) != aoutsz)
+ goto readerr;
+ nsect = get_16be(fhdr.f_nscns);
+ for (i = 0; i < nsect; ++i) {
+ if (read(fd, &shdr, sizeof(shdr)) != sizeof(shdr))
+ goto readerr;
+ if (strcmp(shdr.s_name, ".text") == 0) {
+ put_16be(aout.o_snentry, i+1);
+ put_16be(aout.o_sntext, i+1);
+ } else if (strcmp(shdr.s_name, ".data") == 0) {
+ put_16be(aout.o_sndata, i+1);
+ } else if (strcmp(shdr.s_name, ".bss") == 0) {
+ put_16be(aout.o_snbss, i+1);
+ }
+ }
+ put_16be(aout.magic, AOUT_MAGIC);
+ if (lseek(fd, (long) sizeof(struct external_filehdr), 0) == -1
+ || write(fd, &aout, aoutsz) != aoutsz) {
+ fprintf(stderr, "%s: write error\n", av[1]);
+ exit(1);
+ }
+ close(fd);
+ exit(0);
+
+readerr:
+ fprintf(stderr, "%s: read error or file too short\n", av[1]);
+ exit(1);
+}