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authorJonas Bonn <jonas@southpole.se>2011-06-04 22:35:19 +0300
committerJonas Bonn <jonas@southpole.se>2011-07-22 18:46:37 +0200
commit5a2bbb8f64848b5cf9d626f3f17bac6718c91874 (patch)
treee8288d947655e5f8de89b347cef3b825bb022fd7 /arch/openrisc/kernel
parente480158cc825b45eebcc2ff2ff5e5f7965c3875f (diff)
OpenRISC: Module support
Signed-off-by: Jonas Bonn <jonas@southpole.se> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/openrisc/kernel')
-rw-r--r--arch/openrisc/kernel/module.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/module.c b/arch/openrisc/kernel/module.c
new file mode 100644
index 000000000000..10ff50f0202a
--- /dev/null
+++ b/arch/openrisc/kernel/module.c
@@ -0,0 +1,72 @@
+/*
+ * OpenRISC module.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ * 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.
+ */
+
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+
+int apply_relocate_add(Elf32_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *me)
+{
+ unsigned int i;
+ Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
+ Elf32_Sym *sym;
+ uint32_t *location;
+ uint32_t value;
+
+ pr_debug("Applying relocate section %u to %u\n", relsec,
+ sechdrs[relsec].sh_info);
+ for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+ /* This is where to make the change */
+ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
+ + rel[i].r_offset;
+
+ /* This is the symbol it is referring to. Note that all
+ undefined symbols have been resolved. */
+ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ + ELF32_R_SYM(rel[i].r_info);
+ value = sym->st_value + rel[i].r_addend;
+
+ switch (ELF32_R_TYPE(rel[i].r_info)) {
+ case R_OR32_32:
+ *location = value;
+ break;
+ case R_OR32_CONST:
+ location = (uint16_t *)location + 1;
+ *((uint16_t *)location) = (uint16_t) (value);
+ break;
+ case R_OR32_CONSTH:
+ location = (uint16_t *)location + 1;
+ *((uint16_t *)location) = (uint16_t) (value >> 16);
+ break;
+ case R_OR32_JUMPTARG:
+ value -= (uint32_t)location;
+ value >>= 2;
+ value &= 0x03ffffff;
+ value |= *location & 0xfc000000;
+ *location = value;
+ break;
+ default:
+ pr_err("module %s: Unknown relocation: %u\n",
+ me->name, ELF32_R_TYPE(rel[i].r_info));
+ break;
+ }
+ }
+
+ return 0;
+}