microblaze_v8: kernel modules support

Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

2 files changed, 198 insertions, 0 deletions

diff --git a/arch/microblaze/kernel/microblaze_ksyms.c b/arch/microblaze/kernel/microblaze_ksyms.c
new file mode 100644
index 000000000000..5f71790e3c3c
--- /dev/null
+++ b/arch/microblaze/kernel/microblaze_ksyms.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2008-2009 PetaLogix
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/cryptohash.h>
+#include <linux/delay.h>
+#include <linux/in6.h>
+#include <linux/syscalls.h>
+
+#include <asm/checksum.h>
+#include <linux/io.h>
+#include <asm/page.h>
+#include <asm/system.h>
+#include <linux/uaccess.h>
+
+/*
+ * libgcc functions - functions that are used internally by the
+ * compiler... (prototypes are not correct though, but that
+ * doesn't really matter since they're not versioned).
+ */
+extern void __ashldi3(void);
+EXPORT_SYMBOL(__ashldi3);
+extern void __ashrdi3(void);
+EXPORT_SYMBOL(__ashrdi3);
+extern void __divsi3(void);
+EXPORT_SYMBOL(__divsi3);
+extern void __lshrdi3(void);
+EXPORT_SYMBOL(__lshrdi3);
+extern void __modsi3(void);
+EXPORT_SYMBOL(__modsi3);
+extern void __mulsi3(void);
+EXPORT_SYMBOL(__mulsi3);
+extern void __muldi3(void);
+EXPORT_SYMBOL(__muldi3);
+extern void __ucmpdi2(void);
+EXPORT_SYMBOL(__ucmpdi2);
+extern void __udivsi3(void);
+EXPORT_SYMBOL(__udivsi3);
+extern void __umodsi3(void);
+EXPORT_SYMBOL(__umodsi3);
diff --git a/arch/microblaze/kernel/module.c b/arch/microblaze/kernel/module.c
new file mode 100644
index 000000000000..51414171326f
--- /dev/null
+++ b/arch/microblaze/kernel/module.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2007-2009 PetaLogix
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleloader.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>
+
+void *module_alloc(unsigned long size)
+{
+        void *ret;
+        ret = (size == 0) ? NULL : vmalloc(size);
+        pr_debug("module_alloc (%08lx@%08lx)\n", size, (unsigned long int)ret);
+        return ret;
+}
+
+void module_free(struct module *module, void *region)
+{
+        pr_debug("module_free(%s,%08lx)\n", module->name,
+                                        (unsigned long)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 relsec, struct module *module)
+{
+        printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
+                module->name);
+        return -ENOEXEC;
+}
+
+int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
+        unsigned int symindex, unsigned int relsec, struct module *module)
+{
+
+        unsigned int i;
+        Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
+        Elf32_Sym *sym;
+        unsigned long int *location;
+        unsigned long int locoffs;
+        unsigned long int value;
+#if __GNUC__ < 4
+        unsigned long int old_value;
+#endif
+
+        pr_debug("Applying add relocation section %u to %u\n",
+                relsec, sechdrs[relsec].sh_info);
+
+        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
+
+                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
+                                rela[i].r_offset;
+                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
+                        ELF32_R_SYM(rela[i].r_info);
+                value = sym->st_value + rela[i].r_addend;
+
+                switch (ELF32_R_TYPE(rela[i].r_info)) {
+
+                /*
+                 * Be careful! mb-gcc / mb-ld splits the relocs between the
+                 * text and the reloc table. In general this means we must
+                 * read the current contents of (*location), add any offset
+                 * then store the result back in
+                 */
+
+                case R_MICROBLAZE_32:
+#if __GNUC__ < 4
+                        old_value = *location;
+                        *location = value + old_value;
+
+                        pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
+                                old_value, value);
+#else
+                        *location = value;
+#endif
+                        break;
+
+                case R_MICROBLAZE_64:
+#if __GNUC__ < 4
+                        /* Split relocs only required/used pre gcc4.1.1 */
+                        old_value = ((location[0] & 0x0000FFFF) << 16) |
+                                        (location[1] & 0x0000FFFF);
+                        value += old_value;
+#endif
+                        location[0] = (location[0] & 0xFFFF0000) |
+                                        (value >> 16);
+                        location[1] = (location[1] & 0xFFFF0000) |
+                                        (value & 0xFFFF);
+#if __GNUC__ < 4
+                        pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
+                                old_value, value);
+#endif
+                        break;
+
+                case R_MICROBLAZE_64_PCREL:
+                        locoffs = (location[0] & 0xFFFF) << 16 |
+                                (location[1] & 0xFFFF);
+                        value -= (unsigned long int)(location) + 4 +
+                                locoffs;
+                        location[0] = (location[0] & 0xFFFF0000) |
+                                        (value >> 16);
+                        location[1] = (location[1] & 0xFFFF0000) |
+                                        (value & 0xFFFF);
+                        pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
+                                value);
+                        break;
+
+                case R_MICROBLAZE_NONE:
+                        pr_debug("R_MICROBLAZE_NONE\n");
+                        break;
+
+                default:
+                        printk(KERN_ERR "module %s: "
+                                "Unknown relocation: %u\n",
+                                module->name,
+                                ELF32_R_TYPE(rela->r_info));
+                        return -ENOEXEC;
+                }
+        }
+        return 0;
+}
+
+int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
+                struct module *module)
+{
+        return 0;
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+}