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-rw-r--r--arch/mn10300/kernel/module.c206
1 files changed, 206 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/module.c b/arch/mn10300/kernel/module.c
new file mode 100644
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--- /dev/null
+++ b/arch/mn10300/kernel/module.c
@@ -0,0 +1,206 @@
+/* MN10300 Kernel module helper routines
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by Mark Salter (msalter@redhat.com)
+ * - Derived from arch/i386/kernel/module.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public Licence as published by
+ * the Free Software Foundation; either version 2 of the Licence, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public Licence for more details.
+ *
+ * You should have received a copy of the GNU General Public Licence
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(fmt, ...)
+#endif
+
+/*
+ * allocate storage for a module
+ */
+void *module_alloc(unsigned long size)
+{
+ if (size == 0)
+ return NULL;
+ return vmalloc_exec(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. */
+}
+
+/*
+ * allow the arch to fix up the section table
+ * - we don't need anything special
+ */
+int module_frob_arch_sections(Elf_Ehdr *hdr,
+ Elf_Shdr *sechdrs,
+ char *secstrings,
+ struct module *mod)
+{
+ return 0;
+}
+
+static uint32_t reloc_get16(uint8_t *p)
+{
+ return p[0] | (p[1] << 8);
+}
+
+static uint32_t reloc_get24(uint8_t *p)
+{
+ return reloc_get16(p) | (p[2] << 16);
+}
+
+static uint32_t reloc_get32(uint8_t *p)
+{
+ return reloc_get16(p) | (reloc_get16(p+2) << 16);
+}
+
+static void reloc_put16(uint8_t *p, uint32_t val)
+{
+ p[0] = val & 0xff;
+ p[1] = (val >> 8) & 0xff;
+}
+
+static void reloc_put24(uint8_t *p, uint32_t val)
+{
+ reloc_put16(p, val);
+ p[2] = (val >> 16) & 0xff;
+}
+
+static void reloc_put32(uint8_t *p, uint32_t val)
+{
+ reloc_put16(p, val);
+ reloc_put16(p+2, val >> 16);
+}
+
+/*
+ * apply a REL relocation
+ */
+int apply_relocate(Elf32_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *me)
+{
+ printk(KERN_ERR "module %s: RELOCATION unsupported\n",
+ me->name);
+ return -ENOEXEC;
+}
+
+/*
+ * apply a RELA relocation
+ */
+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;
+ uint8_t *location;
+ uint32_t value;
+
+ DEBUGP("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 the relocation is referring to (note that
+ * all undefined symbols have been resolved by the caller) */
+ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ + ELF32_R_SYM(rel[i].r_info);
+
+ /* this is the adjustment to be made */
+ relocation = sym->st_value + rel[i].r_addend;
+
+ switch (ELF32_R_TYPE(rel[i].r_info)) {
+ /* for the first four relocation types, we add the
+ * adjustment into the value at the location given */
+ case R_MN10300_32:
+ value = reloc_get32(location);
+ value += relocation;
+ reloc_put32(location, value);
+ break;
+ case R_MN10300_24:
+ value = reloc_get24(location);
+ value += relocation;
+ reloc_put24(location, value);
+ break;
+ case R_MN10300_16:
+ value = reloc_get16(location);
+ value += relocation;
+ reloc_put16(location, value);
+ break;
+ case R_MN10300_8:
+ *location += relocation;
+ break;
+
+ /* for the next three relocation types, we write the
+ * adjustment with the address subtracted over the
+ * value at the location given */
+ case R_MN10300_PCREL32:
+ value = relocation - (uint32_t) location;
+ reloc_put32(location, value);
+ break;
+ case R_MN10300_PCREL16:
+ value = relocation - (uint32_t) location;
+ reloc_put16(location, value);
+ break;
+ case R_MN10300_PCREL8:
+ *location = relocation - (uint32_t) location;
+ break;
+
+ default:
+ printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+ me->name, ELF32_R_TYPE(rel[i].r_info));
+ return -ENOEXEC;
+ }
+ }
+ return 0;
+}
+
+/*
+ * finish loading the module
+ */
+int module_finalize(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs,
+ struct module *me)
+{
+ return 0;
+}
+
+/*
+ * finish clearing the module
+ */
+void module_arch_cleanup(struct module *mod)
+{
+}
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