From: Paul Mundt <lethal@Linux-SH.ORG>
This adds support for modules.
Signed-off-by: Richard Curnow <rc@rc0.org.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/arch/sh64/kernel/module.c | 161 ++++++++++++++++++++++++++++++++++++++
25-akpm/include/asm-sh64/elf.h | 6 +
25-akpm/include/asm-sh64/module.h | 8 +
3 files changed, 175 insertions(+)
diff -puN /dev/null arch/sh64/kernel/module.c
--- /dev/null 2003-09-15 06:40:47.000000000 -0700
+++ 25-akpm/arch/sh64/kernel/module.c 2005-03-07 20:41:27.000000000 -0800
@@ -0,0 +1,161 @@
+/* Kernel module help for sh64.
+
+ 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 2004 SuperH (UK) Ltd
+ Author: Richard Curnow
+
+ Based on the sh version, and on code from the sh64-specific parts of
+ modutils, originally written by Richard Curnow and Ben Gaster.
+
+*/
+#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
+
+void *module_alloc(unsigned long size)
+{
+ if (size == 0)
+ return NULL;
+ return vmalloc(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. */
+}
+
+/* We don't need anything special. */
+int module_frob_arch_sections(Elf_Ehdr *hdr,
+ Elf_Shdr *sechdrs,
+ char *secstrings,
+ struct module *mod)
+{
+ return 0;
+}
+
+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;
+ uint32_t *location;
+ int align;
+ int is_shmedia;
+
+ 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 it is referring to. Note that all
+ undefined symbols have been resolved. */
+ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ + ELF32_R_SYM(rel[i].r_info);
+ relocation = sym->st_value + rel[i].r_addend;
+ align = (int)location & 3;
+
+ /* For text addresses, bit2 of the st_other field indicates
+ * whether the symbol is SHmedia (1) or SHcompact (0). If
+ * SHmedia, the LSB of the symbol needs to be asserted
+ * for the CPU to be in SHmedia mode when it starts executing
+ * the branch target. */
+ is_shmedia = (sym->st_other & 4) ? 1 : 0;
+ if (is_shmedia) {
+ relocation |= 1;
+ }
+
+ switch (ELF32_R_TYPE(rel[i].r_info)) {
+ case R_SH_DIR32:
+ DEBUGP("R_SH_DIR32 @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
+ *location += relocation;
+ break;
+ case R_SH_REL32:
+ DEBUGP("R_SH_REL32 @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
+ relocation -= (Elf32_Addr) location;
+ *location += relocation;
+ break;
+ case R_SH_IMM_LOW16:
+ DEBUGP("R_SH_IMM_LOW16 @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
+ *location = (*location & ~0x3fffc00) |
+ ((relocation & 0xffff) << 10);
+ break;
+ case R_SH_IMM_MEDLOW16:
+ DEBUGP("R_SH_IMM_MEDLOW16 @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
+ *location = (*location & ~0x3fffc00) |
+ (((relocation >> 16) & 0xffff) << 10);
+ break;
+ case R_SH_IMM_LOW16_PCREL:
+ DEBUGP("R_SH_IMM_LOW16_PCREL @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
+ relocation -= (Elf32_Addr) location;
+ *location = (*location & ~0x3fffc00) |
+ ((relocation & 0xffff) << 10);
+ break;
+ case R_SH_IMM_MEDLOW16_PCREL:
+ DEBUGP("R_SH_IMM_MEDLOW16_PCREL @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
+ relocation -= (Elf32_Addr) location;
+ *location = (*location & ~0x3fffc00) |
+ (((relocation >> 16) & 0xffff) << 10);
+ break;
+ default:
+ printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+ me->name, ELF32_R_TYPE(rel[i].r_info));
+ return -ENOEXEC;
+ }
+ }
+ return 0;
+}
+
+int apply_relocate(Elf32_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *me)
+{
+ printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
+ me->name);
+ return -ENOEXEC;
+}
+
+int module_finalize(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs,
+ struct module *me)
+{
+ return 0;
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+}
+
diff -puN include/asm-sh64/elf.h~sh64-module-support include/asm-sh64/elf.h
--- 25/include/asm-sh64/elf.h~sh64-module-support 2005-03-07 20:41:27.000000000 -0800
+++ 25-akpm/include/asm-sh64/elf.h 2005-03-07 20:41:27.000000000 -0800
@@ -53,6 +53,12 @@ typedef struct user_fpu_struct elf_fpreg
#define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
+#define R_SH_DIR32 1
+#define R_SH_REL32 2
+#define R_SH_IMM_LOW16 246
+#define R_SH_IMM_LOW16_PCREL 247
+#define R_SH_IMM_MEDLOW16 248
+#define R_SH_IMM_MEDLOW16_PCREL 249
#define ELF_CORE_COPY_REGS(_dest,_regs) \
memcpy((char *) &_dest, (char *) _regs, \
diff -puN include/asm-sh64/module.h~sh64-module-support include/asm-sh64/module.h
--- 25/include/asm-sh64/module.h~sh64-module-support 2005-03-07 20:41:27.000000000 -0800
+++ 25-akpm/include/asm-sh64/module.h 2005-03-07 20:41:27.000000000 -0800
@@ -4,6 +4,14 @@
* This file contains the SH architecture specific module code.
*/
+struct mod_arch_specific {
+ /* empty */
+};
+
+#define Elf_Shdr Elf32_Shdr
+#define Elf_Sym Elf32_Sym
+#define Elf_Ehdr Elf32_Ehdr
+
#define module_map(x) vmalloc(x)
#define module_unmap(x) vfree(x)
#define module_arch_init(x) (0)
_