MIPS: Fix module.c build for 32 bit

Fixes build failure introduced by "Make most arch asm/module.h files use
asm-generic/module.h" by moving all the RELA processing code to a
separate file to be used only for RELA processing on 64-bit kernels.

  CC      arch/mips/kernel/module.o
arch/mips/kernel/module.c:250:14: error: 'reloc_handlers_rela' defined but not
used [-Werror=unused-variable]
cc1: all warnings being treated as errors

make[6]: *** [arch/mips/kernel/module.o] Error 1

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 145 insertions, 0 deletions

diff --git a/arch/mips/kernel/module-rela.c b/arch/mips/kernel/module-rela.c
new file mode 100644
index 000000000000..61d60028b888
--- /dev/null
+++ b/arch/mips/kernel/module-rela.c
@@ -0,0 +1,145 @@
+/*
+ *  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.
+ *
+ *  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 License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *  Copyright (C) 2001 Rusty Russell.
+ *  Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
+ *  Copyright (C) 2005 Thiemo Seufer
+ */
+
+#include <linux/elf.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/moduleloader.h>
+
+extern int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v);
+
+static int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v)
+{
+        *location = v;
+
+        return 0;
+}
+
+static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
+{
+        if (v % 4) {
+                pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n",
+                       me->name);
+                return -ENOEXEC;
+        }
+
+        if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
+                printk(KERN_ERR
+                       "module %s: relocation overflow\n",
+                       me->name);
+                return -ENOEXEC;
+        }
+
+        *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
+
+        return 0;
+}
+
+static int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v)
+{
+        *location = (*location & 0xffff0000) |
+                    ((((long long) v + 0x8000LL) >> 16) & 0xffff);
+
+        return 0;
+}
+
+static int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v)
+{
+        *location = (*location & 0xffff0000) | (v & 0xffff);
+
+        return 0;
+}
+
+static int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v)
+{
+        *(Elf_Addr *)location = v;
+
+        return 0;
+}
+
+static int apply_r_mips_higher_rela(struct module *me, u32 *location,
+                                    Elf_Addr v)
+{
+        *location = (*location & 0xffff0000) |
+                    ((((long long) v + 0x80008000LL) >> 32) & 0xffff);
+
+        return 0;
+}
+
+static int apply_r_mips_highest_rela(struct module *me, u32 *location,
+                                     Elf_Addr v)
+{
+        *location = (*location & 0xffff0000) |
+                    ((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
+
+        return 0;
+}
+
+static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
+                                Elf_Addr v) = {
+        [R_MIPS_NONE]           = apply_r_mips_none,
+        [R_MIPS_32]             = apply_r_mips_32_rela,
+        [R_MIPS_26]             = apply_r_mips_26_rela,
+        [R_MIPS_HI16]           = apply_r_mips_hi16_rela,
+        [R_MIPS_LO16]           = apply_r_mips_lo16_rela,
+        [R_MIPS_64]             = apply_r_mips_64_rela,
+        [R_MIPS_HIGHER]         = apply_r_mips_higher_rela,
+        [R_MIPS_HIGHEST]        = apply_r_mips_highest_rela
+};
+
+int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
+                       unsigned int symindex, unsigned int relsec,
+                       struct module *me)
+{
+        Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
+        Elf_Sym *sym;
+        u32 *location;
+        unsigned int i;
+        Elf_Addr v;
+        int res;
+
+        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 */
+                sym = (Elf_Sym *)sechdrs[symindex].sh_addr
+                        + ELF_MIPS_R_SYM(rel[i]);
+                if (IS_ERR_VALUE(sym->st_value)) {
+                        /* Ignore unresolved weak symbol */
+                        if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
+                                continue;
+                        printk(KERN_WARNING "%s: Unknown symbol %s\n",
+                               me->name, strtab + sym->st_name);
+                        return -ENOENT;
+                }
+
+                v = sym->st_value + rel[i].r_addend;
+
+                res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
+                if (res)
+                        return res;
+        }
+
+        return 0;
+}