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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>
This commit is contained in:
Michal Simek
parent
7fbd323208
commit
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3 changed files with 235 additions and 0 deletions
37
arch/microblaze/include/asm/module.h
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37
arch/microblaze/include/asm/module.h
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/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_MODULE_H
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#define _ASM_MICROBLAZE_MODULE_H
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/* Microblaze Relocations */
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#define R_MICROBLAZE_NONE 0
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#define R_MICROBLAZE_32 1
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#define R_MICROBLAZE_32_PCREL 2
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#define R_MICROBLAZE_64_PCREL 3
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#define R_MICROBLAZE_32_PCREL_LO 4
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#define R_MICROBLAZE_64 5
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#define R_MICROBLAZE_32_LO 6
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#define R_MICROBLAZE_SRO32 7
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#define R_MICROBLAZE_SRW32 8
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#define R_MICROBLAZE_64_NONE 9
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#define R_MICROBLAZE_32_SYM_OP_SYM 10
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/* Keep this the last entry. */
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#define R_MICROBLAZE_NUM 11
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struct mod_arch_specific {
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int foo;
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};
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#define Elf_Shdr Elf32_Shdr
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#define Elf_Sym Elf32_Sym
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#define Elf_Ehdr Elf32_Ehdr
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typedef struct { volatile int counter; } module_t;
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#endif /* _ASM_MICROBLAZE_MODULE_H */
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47
arch/microblaze/kernel/microblaze_ksyms.c
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47
arch/microblaze/kernel/microblaze_ksyms.c
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/*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/cryptohash.h>
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#include <linux/delay.h>
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#include <linux/in6.h>
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#include <linux/syscalls.h>
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#include <asm/checksum.h>
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#include <linux/io.h>
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#include <asm/page.h>
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#include <asm/system.h>
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#include <linux/uaccess.h>
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/*
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* libgcc functions - functions that are used internally by the
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* compiler... (prototypes are not correct though, but that
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* doesn't really matter since they're not versioned).
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*/
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extern void __ashldi3(void);
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EXPORT_SYMBOL(__ashldi3);
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extern void __ashrdi3(void);
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EXPORT_SYMBOL(__ashrdi3);
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extern void __divsi3(void);
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EXPORT_SYMBOL(__divsi3);
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extern void __lshrdi3(void);
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EXPORT_SYMBOL(__lshrdi3);
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extern void __modsi3(void);
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EXPORT_SYMBOL(__modsi3);
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extern void __mulsi3(void);
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EXPORT_SYMBOL(__mulsi3);
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extern void __muldi3(void);
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EXPORT_SYMBOL(__muldi3);
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extern void __ucmpdi2(void);
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EXPORT_SYMBOL(__ucmpdi2);
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extern void __udivsi3(void);
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EXPORT_SYMBOL(__udivsi3);
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extern void __umodsi3(void);
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EXPORT_SYMBOL(__umodsi3);
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151
arch/microblaze/kernel/module.c
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151
arch/microblaze/kernel/module.c
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/*
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* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2007-2009 PetaLogix
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/moduleloader.h>
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#include <linux/kernel.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <asm/pgtable.h>
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void *module_alloc(unsigned long size)
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{
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void *ret;
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ret = (size == 0) ? NULL : vmalloc(size);
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pr_debug("module_alloc (%08lx@%08lx)\n", size, (unsigned long int)ret);
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return ret;
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}
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void module_free(struct module *module, void *region)
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{
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pr_debug("module_free(%s,%08lx)\n", module->name,
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(unsigned long)region);
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vfree(region);
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}
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int module_frob_arch_sections(Elf_Ehdr *hdr,
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Elf_Shdr *sechdrs,
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char *secstrings,
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struct module *mod)
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{
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return 0;
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}
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int apply_relocate(Elf32_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec, struct module *module)
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{
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printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
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module->name);
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return -ENOEXEC;
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}
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int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec, struct module *module)
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{
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unsigned int i;
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Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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unsigned long int *location;
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unsigned long int locoffs;
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unsigned long int value;
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#if __GNUC__ < 4
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unsigned long int old_value;
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#endif
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pr_debug("Applying add relocation section %u to %u\n",
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relsec, sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
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rela[i].r_offset;
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
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ELF32_R_SYM(rela[i].r_info);
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value = sym->st_value + rela[i].r_addend;
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switch (ELF32_R_TYPE(rela[i].r_info)) {
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/*
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* Be careful! mb-gcc / mb-ld splits the relocs between the
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* text and the reloc table. In general this means we must
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* read the current contents of (*location), add any offset
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* then store the result back in
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*/
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case R_MICROBLAZE_32:
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#if __GNUC__ < 4
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old_value = *location;
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*location = value + old_value;
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pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
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old_value, value);
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#else
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*location = value;
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#endif
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break;
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case R_MICROBLAZE_64:
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#if __GNUC__ < 4
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/* Split relocs only required/used pre gcc4.1.1 */
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old_value = ((location[0] & 0x0000FFFF) << 16) |
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(location[1] & 0x0000FFFF);
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value += old_value;
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#endif
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location[0] = (location[0] & 0xFFFF0000) |
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(value >> 16);
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location[1] = (location[1] & 0xFFFF0000) |
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(value & 0xFFFF);
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#if __GNUC__ < 4
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pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
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old_value, value);
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#endif
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break;
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case R_MICROBLAZE_64_PCREL:
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locoffs = (location[0] & 0xFFFF) << 16 |
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(location[1] & 0xFFFF);
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value -= (unsigned long int)(location) + 4 +
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locoffs;
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location[0] = (location[0] & 0xFFFF0000) |
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(value >> 16);
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location[1] = (location[1] & 0xFFFF0000) |
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(value & 0xFFFF);
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pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
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value);
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break;
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case R_MICROBLAZE_NONE:
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pr_debug("R_MICROBLAZE_NONE\n");
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break;
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default:
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printk(KERN_ERR "module %s: "
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"Unknown relocation: %u\n",
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module->name,
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ELF32_R_TYPE(rela->r_info));
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return -ENOEXEC;
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}
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}
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return 0;
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}
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int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
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struct module *module)
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{
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return 0;
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}
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void module_arch_cleanup(struct module *mod)
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{
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}
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