Simple handler for the common SHcompact ELF relocations.
Signed-off-by: Paul Mundt <lethal at linux-sh.org>
---
kexec/arch/sh/kexec-elf-rel-sh.c | 45 +++++++++++++++++++++++++++++++++----
1 files changed, 40 insertions(+), 5 deletions(-)
diff --git a/kexec/arch/sh/kexec-elf-rel-sh.c b/kexec/arch/sh/kexec-elf-rel-sh.c
index 3e16b28..c1aaa60 100644
--- a/kexec/arch/sh/kexec-elf-rel-sh.c
+++ b/kexec/arch/sh/kexec-elf-rel-sh.c
@@ -1,3 +1,15 @@
+/*
+ * kexec-elf-rel-sh.c - ELF relocations for SuperH
+ * Copyright (C) 2008 Paul Mundt
+ *
+ * Based on the SHcompact module loader (arch/sh/kernel/module.c) in the
+ * Linux kernel, which is written by:
+ *
+ * Copyright (C) 2003 - 2008 Kaz Kojima & Paul Mundt
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
#include <stdio.h>
#include <elf.h>
#include "../../kexec.h"
@@ -5,14 +17,37 @@
int machine_verify_elf_rel(struct mem_ehdr *ehdr)
{
+ /* Intentionally don't bother with endianness validation, it's
+ * configurable */
- die("machine_verify_elf_rel is not implemented\n");
- return 0;
+ if (ehdr->ei_class != ELFCLASS32)
+ return 0;
+ if (ehdr->e_machine != EM_SH)
+ return 0;
+
+ return 1;
}
void machine_apply_elf_rel(struct mem_ehdr *ehdr, unsigned long r_type,
- void *location, unsigned long address, unsigned long value)
+ void *orig_loc, unsigned long address, unsigned long relocation)
{
- die("Unknown rela relocation: %lu\n", r_type);
- return;
+ uint32_t *location = orig_loc;
+ uint32_t value;
+
+ switch (r_type) {
+ case R_SH_DIR32:
+ value = get_unaligned(location);
+ value += relocation;
+ put_unaligned(value, location);
+ break;
+ case R_SH_REL32:
+ relocation = (relocation - (uint32_t)location);
+ value = get_unaligned(location);
+ value += relocation;
+ put_unaligned(value, location);
+ break;
+ default:
+ die("Unknown rela relocation: %lu\n", r_type);
+ break;
+ }
}
