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>
diff --git a/arch/microblaze/kernel/module.c b/arch/microblaze/kernel/module.c
new file mode 100644
index 0000000..5141417
--- /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)
+{
+}