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    Subject[PATCH 13/60] microblaze_v4: kernel modules support
    Date
    From: Michal Simek <monstr@monstr.eu>


    Signed-off-by: Michal Simek <monstr@monstr.eu>
    ---
    arch/microblaze/kernel/microblaze_ksyms.c | 47 ++++++++++
    arch/microblaze/kernel/module.c | 140 +++++++++++++++++++++++++++++
    include/asm-microblaze/module.h | 37 ++++++++
    3 files changed, 224 insertions(+), 0 deletions(-)
    create mode 100644 arch/microblaze/kernel/microblaze_ksyms.c
    create mode 100644 arch/microblaze/kernel/module.c
    create mode 100644 include/asm-microblaze/module.h

    diff --git a/arch/microblaze/kernel/microblaze_ksyms.c b/arch/microblaze/kernel/microblaze_ksyms.c
    new file mode 100644
    index 0000000..297cd68
    --- /dev/null
    +++ b/arch/microblaze/kernel/microblaze_ksyms.c
    @@ -0,0 +1,47 @@
    +/*
    + * Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
    + *
    + * 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 <asm/io.h>
    +#include <asm/page.h>
    +#include <asm/system.h>
    +#include <asm/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);
    +/*extern void fpundefinstr(void);
    +extern void fp_enter(void);*/
    diff --git a/arch/microblaze/kernel/module.c b/arch/microblaze/kernel/module.c
    new file mode 100644
    index 0000000..a59b2e5
    --- /dev/null
    +++ b/arch/microblaze/kernel/module.c
    @@ -0,0 +1,140 @@
    +/*
    + * 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>
    +
    +#undef DEBUG
    +
    +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;
    + unsigned long int old_value;
    +
    + 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:
    + old_value = *location;
    + *location = value + old_value;
    + pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
    + old_value, value);
    + break;
    +
    + case R_MICROBLAZE_64:
    + old_value = ((location[0] & 0x0000FFFF) << 16) |
    + ((location[1] & 0x0000FFFF));
    + value += old_value;
    + location[0] = (location[0] & 0xFFFF0000) |
    + (value >> 16);
    + location[1] = (location[1] & 0xFFFF0000) |
    + (value & 0xFFFF);
    + pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
    + old_value, value);
    + 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)
    +{
    +}
    diff --git a/include/asm-microblaze/module.h b/include/asm-microblaze/module.h
    new file mode 100644
    index 0000000..914565a
    --- /dev/null
    +++ b/include/asm-microblaze/module.h
    @@ -0,0 +1,37 @@
    +/*
    + * Copyright (C) 2006 Atmark Techno, Inc.
    + *
    + * This file is subject to the terms and conditions of the GNU General Public
    + * License. See the file "COPYING" in the main directory of this archive
    + * for more details.
    + */
    +
    +#ifndef _ASM_MICROBLAZE_MODULE_H
    +#define _ASM_MICROBLAZE_MODULE_H
    +
    +/* Microblaze Relocations */
    +#define R_MICROBLAZE_NONE 0
    +#define R_MICROBLAZE_32 1
    +#define R_MICROBLAZE_32_PCREL 2
    +#define R_MICROBLAZE_64_PCREL 3
    +#define R_MICROBLAZE_32_PCREL_LO 4
    +#define R_MICROBLAZE_64 5
    +#define R_MICROBLAZE_32_LO 6
    +#define R_MICROBLAZE_SRO32 7
    +#define R_MICROBLAZE_SRW32 8
    +#define R_MICROBLAZE_64_NONE 9
    +#define R_MICROBLAZE_32_SYM_OP_SYM 10
    +/* Keep this the last entry. */
    +#define R_MICROBLAZE_NUM 11
    +
    +struct mod_arch_specific {
    + int foo;
    +};
    +
    +#define Elf_Shdr Elf32_Shdr
    +#define Elf_Sym Elf32_Sym
    +#define Elf_Ehdr Elf32_Ehdr
    +
    +typedef struct { volatile int counter; } module_t;
    +
    +#endif /* _ASM_MICROBLAZE_MODULE_H */
    --
    1.5.4.GIT


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