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Subject[PATCH 14/19] OpenRISC: Module support
Date

Signed-off-by: Jonas Bonn <jonas@southpole.se>
---
arch/openrisc/kernel/module.c | 126 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 126 insertions(+), 0 deletions(-)
create mode 100644 arch/openrisc/kernel/module.c
diff --git a/arch/openrisc/kernel/module.c b/arch/openrisc/kernel/module.c
new file mode 100644
index 0000000..952b129
--- /dev/null
+++ b/arch/openrisc/kernel/module.c
@@ -0,0 +1,126 @@
+/*
+ * 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>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+
+void *module_alloc(unsigned long size)
+{
+ pr_debug("module_alloc size: %lu\n", size);
+
+ if (size == 0)
+ return NULL;
+
+ return vmalloc(size);
+}
+
+
+/* Free memory returned from module_alloc */
+void module_free(struct module *mod, void *module_region)
+{
+ vfree(module_region);
+ /* FIXME: If module_region == mod->init_region, trim exception
+ table entries. */
+}
+
+/* We don't need anything special. */
+int module_frob_arch_sections(Elf_Ehdr *hdr,
+ Elf_Shdr *sechdrs,
+ char *secstrings,
+ struct module *mod)
+{
+ return 0;
+}
+
+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;
+// Elf32_Addr relocation;
+ 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;
+}
+
+int apply_relocate(Elf32_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *me)
+{
+ pr_err("module %s: REL relocation unsupported\n", me->name);
+ return -ENOEXEC;
+}
+
+int module_finalize(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs,
+ struct module *me)
+{
+ return 0;
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+}
--
1.7.4.1


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