1 files changed, 152 insertions, 0 deletions

diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
new file mode 100644
index 000000000000..1a85cfdad5ac
--- /dev/null
+++ b/arch/arm/kernel/module.c
@@ -0,0 +1,152 @@
+/*
+ *  linux/arch/arm/kernel/module.c
+ *
+ *  Copyright (C) 2002 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Module allocation method suggested by Andi Kleen.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+
+#include <asm/pgtable.h>
+
+#ifdef CONFIG_XIP_KERNEL
+/*
+ * The XIP kernel text is mapped in the module area for modules and
+ * some other stuff to work without any indirect relocations.
+ * MODULE_START is redefined here and not in asm/memory.h to avoid
+ * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
+ */
+extern void _etext;
+#undef MODULE_START
+#define MODULE_START    (((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK)
+#endif
+
+void *module_alloc(unsigned long size)
+{
+        struct vm_struct *area;
+
+        size = PAGE_ALIGN(size);
+        if (!size)
+                return NULL;
+
+        area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END);
+        if (!area)
+                return NULL;
+
+        return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
+}
+
+void module_free(struct module *module, void *region)
+{
+        vfree(region);
+}
+
+int module_frob_arch_sections(Elf_Ehdr *hdr,
+                              Elf_Shdr *sechdrs,
+                              char *secstrings,
+                              struct module *mod)
+{
+        return 0;
+}
+
+int
+apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
+               unsigned int relindex, struct module *module)
+{
+        Elf32_Shdr *symsec = sechdrs + symindex;
+        Elf32_Shdr *relsec = sechdrs + relindex;
+        Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
+        Elf32_Rel *rel = (void *)relsec->sh_addr;
+        unsigned int i;
+
+        for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
+                unsigned long loc;
+                Elf32_Sym *sym;
+                s32 offset;
+
+                offset = ELF32_R_SYM(rel->r_info);
+                if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
+                        printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
+                                module->name, relindex, i);
+                        return -ENOEXEC;
+                }
+
+                sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
+
+                if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {
+                        printk(KERN_ERR "%s: out of bounds relocation, "
+                                "section %d reloc %d offset %d size %d\n",
+                                module->name, relindex, i, rel->r_offset,
+                                dstsec->sh_size);
+                        return -ENOEXEC;
+                }
+
+                loc = dstsec->sh_addr + rel->r_offset;
+
+                switch (ELF32_R_TYPE(rel->r_info)) {
+                case R_ARM_ABS32:
+                        *(u32 *)loc += sym->st_value;
+                        break;
+
+                case R_ARM_PC24:
+                        offset = (*(u32 *)loc & 0x00ffffff) << 2;
+                        if (offset & 0x02000000)
+                                offset -= 0x04000000;
+
+                        offset += sym->st_value - loc;
+                        if (offset & 3 ||
+                            offset <= (s32)0xfc000000 ||
+                            offset >= (s32)0x04000000) {
+                                printk(KERN_ERR
+                                       "%s: relocation out of range, section "
+                                       "%d reloc %d sym '%s'\n", module->name,
+                                       relindex, i, strtab + sym->st_name);
+                                return -ENOEXEC;
+                        }
+
+                        offset >>= 2;
+
+                        *(u32 *)loc &= 0xff000000;
+                        *(u32 *)loc |= offset & 0x00ffffff;
+                        break;
+
+                default:
+                        printk(KERN_ERR "%s: unknown relocation: %u\n",
+                               module->name, ELF32_R_TYPE(rel->r_info));
+                        return -ENOEXEC;
+                }
+        }
+        return 0;
+}
+
+int
+apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
+                   unsigned int symindex, unsigned int relsec, struct module *module)
+{
+        printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
+               module->name);
+        return -ENOEXEC;
+}
+
+int
+module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
+                struct module *module)
+{
+        return 0;
+}
+
+void
+module_arch_cleanup(struct module *mod)
+{
+}