Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753727AbaDRMof (ORCPT ); Fri, 18 Apr 2014 08:44:35 -0400 Received: from mail-by2on0119.outbound.protection.outlook.com ([207.46.100.119]:34071 "EHLO na01-by2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752726AbaDRMob (ORCPT ); Fri, 18 Apr 2014 08:44:31 -0400 From: Ley Foon Tan To: , , CC: Ley Foon Tan , , Subject: [PATCH 24/28] nios2: Module support Date: Fri, 18 Apr 2014 20:27:07 +0800 Message-ID: <1397824031-4892-21-git-send-email-lftan@altera.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1397824031-4892-1-git-send-email-lftan@altera.com> References: <1397824031-4892-1-git-send-email-lftan@altera.com> MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:66.35.236.232;CTRY:US;IPV:NLI;EFV:NLI;SFV:NSPM;SFS:(10019001)(6009001)(458001)(189002)(199002)(22564002)(93916002)(97736001)(86362001)(46102001)(50466002)(80022001)(50986999)(80976001)(62966002)(81342001)(4396001)(50226001)(48376002)(81542001)(76176999)(2009001)(99396002)(83072002)(85852003)(76482001)(42186004)(74502001)(47776003)(20776003)(16796002)(77982001)(31966008)(74662001)(84676001)(87936001)(87286001)(77156001)(89996001)(88136002)(19580395003)(36756003)(6806004)(44976005)(19580405001)(83322001)(2201001)(92566001)(92726001);DIR:OUT;SFP:1102;SCL:1;SRVR:BL2FFO11HUB047;H:SJ-ITEXEDGE02.altera.priv.altera.com;FPR:EA497D4E.A7F0A659.3C3A97E.84D5CF31.203F1;MLV:sfv;PTR:InfoDomainNonexistent;MX:1;A:1;LANG:en; X-OriginatorOrg: altera.onmicrosoft.com X-Forefront-PRVS: 018577E36E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds support for loadable modules. Signed-off-by: Ley Foon Tan --- arch/nios2/kernel/module.c | 135 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 135 insertions(+) create mode 100644 arch/nios2/kernel/module.c diff --git a/arch/nios2/kernel/module.c b/arch/nios2/kernel/module.c new file mode 100644 index 0000000..360c53ab29f64f4e44c8cfe27f7176d793578569 --- /dev/null +++ b/arch/nios2/kernel/module.c @@ -0,0 +1,135 @@ +/* + * Kernel module support for Nios II. + * + * Copyright (C) 2004 Microtronix Datacom Ltd. + * Written by Wentao Xu + * Copyright (C) 2001, 2003 Rusty Russell + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +void *module_alloc(unsigned long size) +{ + if (size == 0) + return NULL; + return kmalloc(size, GFP_KERNEL); +} + +/* Free memory returned from module_alloc */ +void module_free(struct module *mod, void *module_region) +{ + kfree(module_region); +} + +int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, + struct module *mod) +{ + unsigned int i; + Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; + + pr_debug("Applying relocate section %u to %u\n", relsec, + sechdrs[relsec].sh_info); + + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { + /* This is where to make the change */ + uint32_t word; + uint32_t *loc + = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rela[i].r_offset); + /* This is the symbol it is referring to. Note that all + undefined symbols have been resolved. */ + Elf32_Sym *sym + = ((Elf32_Sym *)sechdrs[symindex].sh_addr + + ELF32_R_SYM(rela[i].r_info)); + uint32_t v = sym->st_value + rela[i].r_addend; + pr_debug("reltype %d 0x%x name:<%s>\n", + ELF32_R_TYPE(rela[i].r_info), + rela[i].r_offset, strtab + sym->st_name); + + switch (ELF32_R_TYPE(rela[i].r_info)) { + case R_NIOS2_NONE: + break; + case R_NIOS2_BFD_RELOC_32: + *loc += v; + break; + case R_NIOS2_PCREL16: + v -= (uint32_t)loc + 4; + if ((int32_t)v > 0x7fff || + (int32_t)v < -(int32_t)0x8000) { + pr_err("module %s: relocation overflow\n", + mod->name); + return -ENOEXEC; + } + word = *loc; + *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | + (word & 0x3f); + break; + case R_NIOS2_CALL26: + if (v & 3) { + pr_err("module %s: dangerous relocation\n", + mod->name); + return -ENOEXEC; + } + if ((v >> 28) != ((uint32_t)loc >> 28)) { + pr_err("module %s: relocation overflow\n", + mod->name); + return -ENOEXEC; + } + *loc = (*loc & 0x3f) | ((v >> 2) << 6); + break; + case R_NIOS2_HI16: + word = *loc; + *loc = ((((word >> 22) << 16) | + ((v >> 16) & 0xffff)) << 6) | (word & 0x3f); + break; + case R_NIOS2_LO16: + word = *loc; + *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | + (word & 0x3f); + break; + case R_NIOS2_HIADJ16: + { + Elf32_Addr word2; + + word = *loc; + word2 = ((v >> 16) + ((v >> 15) & 1)) & 0xffff; + *loc = ((((word >> 22) << 16) | word2) << 6) | + (word & 0x3f); + } + break; + + default: + pr_err("module %s: Unknown reloc: %u\n", + mod->name, ELF32_R_TYPE(rela[i].r_info)); + return -ENOEXEC; + } + } + + return 0; +} + +int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, + struct module *me) +{ + flush_cache_all(); + return 0; +} + +void module_arch_cleanup(struct module *mod) +{ +} -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/