From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16EC9C433F5 for ; Fri, 17 Sep 2021 08:29:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ED5D7611C0 for ; Fri, 17 Sep 2021 08:29:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245309AbhIQIai (ORCPT ); Fri, 17 Sep 2021 04:30:38 -0400 Received: from mout.kundenserver.de ([212.227.126.133]:36755 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245282AbhIQIah (ORCPT ); Fri, 17 Sep 2021 04:30:37 -0400 Received: from mail-wm1-f43.google.com ([209.85.128.43]) by mrelayeu.kundenserver.de (mreue009 [213.165.67.97]) with ESMTPSA (Nemesis) id 1MgNlH-1n6nun1XTT-00hz8k; Fri, 17 Sep 2021 10:29:14 +0200 Received: by mail-wm1-f43.google.com with SMTP id 196-20020a1c04cd000000b002fa489ffe1fso9304779wme.4; Fri, 17 Sep 2021 01:29:14 -0700 (PDT) X-Gm-Message-State: AOAM533gUrT83if+0ZJ/ATj+J6j3rz2uLsV3e5nh+9dibpXS+Qx3caIX NEadnukOggZu7UCpk2ksNhbjoBl2X8mwzP9tnhA= X-Google-Smtp-Source: ABdhPJwB9DugLgb8FRYpRGR2/Q/B49nmc31tQcXLeqHU5kUD5s+NNyyOr4pOyxcOZc6R7vAS5wQQn+sMiqbTwtp5d1w= X-Received: by 2002:a05:600c:190e:: with SMTP id j14mr5972950wmq.35.1631867353545; Fri, 17 Sep 2021 01:29:13 -0700 (PDT) MIME-Version: 1.0 References: <20210917035736.3934017-1-chenhuacai@loongson.cn> <20210917035736.3934017-16-chenhuacai@loongson.cn> In-Reply-To: <20210917035736.3934017-16-chenhuacai@loongson.cn> From: Arnd Bergmann Date: Fri, 17 Sep 2021 10:28:57 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH V3 15/22] LoongArch: Add elf and module support To: Huacai Chen Cc: Arnd Bergmann , Andy Lutomirski , Thomas Gleixner , Peter Zijlstra , Andrew Morton , David Airlie , Jonathan Corbet , Linus Torvalds , linux-arch , "open list:DOCUMENTATION" , Linux Kernel Mailing List , Xuefeng Li , Yanteng Si , Huacai Chen , Jiaxun Yang , Jessica Yu , Luis Chamberlain Content-Type: text/plain; charset="UTF-8" X-Provags-ID: V03:K1:KShtLSy62103T2Fs8gLVQIqGvI6kohoOEgWsMBlgrP4UQ5fm8Ut gDgYN4fOC7inubwc149TN3TpJBOS8MYsl+OqhDMYLq2Va9PpiyPaimyiIYGH0K+tMULDI9a yosj4qy2HQ8ZekR9R8BehPWcchGiXkcUaS628g+KacjAWO1aLYJwhCxPYVMvyEGjSUwatHt X7l7o6ua8PaG0G8FnpRug== X-UI-Out-Filterresults: notjunk:1;V03:K0:JRwTTjvP3JE=:aaoI4D17sNJGGPrSzJYFP6 l13WHfqVjTNgHZbR6iXpA7sSTAUhBOGBlEUME2R2xwtrzNSakina1DN9pjtGQty3K47PBQgXY Dh2g7db6QL8YPBvS/nLHTBC+pTo1PN5a8eyvJ0q1XFyJNKgMPzC9hygWMZE2rgMvH2gFYiPUa D3/u4IfYWmbj4hCe09j2WHErQ18ZCIzPW/OvjsdFJsynnnPERiBYSiBOJLA2W3oJjzt/Fwe0W M1WZLIq0RvbmEhz4E6XtS2VHkq9K1Ie6wAqe3hJwvUneJWn/NhgWo9EARZN8wjLZbAAqSNNJr v1Ad3TdtNNzw3KWi41jQoFoP1ze3DbR3JfP6I7Eub6yRDFgYR7zjb+XbS0BAIDR6ZfHqANvVd fd44uHPCMNAZzK7xlQNiRXx8oobh1qIxkCF0WABjPW6MfJspm8E+U03TyJs6TsaQrZHva0bpU OHYd9aVFwKhc+mqC4sUb8DzaYfg/3x8TSi9bVlPKt4We9xeyc7nLSb1xCv/WoYmNKbFAEHsq0 zfp1VE7HUqu6TwNt6Br6QbsMYoYmKQ44W0fbR3Z9iPF61OtkG3fAqNQxidkBVfrav9WPvvDXz EpRmWSTnF4fcMauihdj2jhuLz2N61Iaz0ofz65Rj0cBMmvStf+99TS3Ki/NgdGehyiSTm9cmq 8SjNvBgtlTJvztYCc68VJnBvo+l103Ts34TwfWvmgH49JGTmtuu2NtUONVRmFkVJe6lBOFT1P wz97fEGuJXukdLnLhwZQKrliHOwmujMZzy4EuLTe8Fb6u/nvmlrTLSpXsgi3fN36n+18dZV50 vTM5GHRcpRutwiizwaEdtd2Svx51xB99KyCGcfu0LnGreaR8KKWk7XMH7aXyMfI10Ey6FeLPj EuWrKIL/++5DUZhnxMgQ== Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Fri, Sep 17, 2021 at 5:57 AM Huacai Chen wrote: > > This patch adds elf definition and module relocate codes. > > Signed-off-by: Huacai Chen > --- > arch/loongarch/include/asm/cpufeature.h | 24 + > arch/loongarch/include/asm/elf.h | 308 +++++++++++ > arch/loongarch/include/asm/exec.h | 10 + > arch/loongarch/include/asm/module.h | 15 + > arch/loongarch/include/asm/vermagic.h | 19 + > arch/loongarch/include/uapi/asm/auxvec.h | 17 + > arch/loongarch/include/uapi/asm/hwcap.h | 20 + > arch/loongarch/kernel/elf.c | 41 ++ > arch/loongarch/kernel/module.c | 652 +++++++++++++++++++++++ > 9 files changed, 1106 insertions(+) > create mode 100644 arch/loongarch/include/asm/cpufeature.h > create mode 100644 arch/loongarch/include/asm/elf.h > create mode 100644 arch/loongarch/include/asm/exec.h > create mode 100644 arch/loongarch/include/asm/module.h > create mode 100644 arch/loongarch/include/asm/vermagic.h > create mode 100644 arch/loongarch/include/uapi/asm/auxvec.h > create mode 100644 arch/loongarch/include/uapi/asm/hwcap.h > create mode 100644 arch/loongarch/kernel/elf.c > create mode 100644 arch/loongarch/kernel/module.c Please add Jessica Yu and Luis Chamberlain as reviewers to Cc in the future. I have no further comments on this patch, fullquote below for them as reference. Arnd > diff --git a/arch/loongarch/include/asm/cpufeature.h b/arch/loongarch/include/asm/cpufeature.h > new file mode 100644 > index 000000000000..7e4c6a769830 > --- /dev/null > +++ b/arch/loongarch/include/asm/cpufeature.h > @@ -0,0 +1,24 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * CPU feature definitions for module loading, used by > + * module_cpu_feature_match(), see uapi/asm/hwcap.h for LoongArch CPU features. > + * > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited > + */ > + > +#ifndef __ASM_CPUFEATURE_H > +#define __ASM_CPUFEATURE_H > + > +#include > +#include > + > +#define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap)) > + > +#define cpu_feature(x) ilog2(HWCAP_ ## x) > + > +static inline bool cpu_have_feature(unsigned int num) > +{ > + return elf_hwcap & (1UL << num); > +} > + > +#endif /* __ASM_CPUFEATURE_H */ > diff --git a/arch/loongarch/include/asm/elf.h b/arch/loongarch/include/asm/elf.h > new file mode 100644 > index 000000000000..9f8c2ab1a206 > --- /dev/null > +++ b/arch/loongarch/include/asm/elf.h > @@ -0,0 +1,308 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited > + */ > +#ifndef _ASM_ELF_H > +#define _ASM_ELF_H > + > +#include > +#include > +#include > + > +#include > + > +#include > + > +/* ELF header e_flags defines. */ > + > +/* The ABI of a file. */ > +#define EF_LARCH_ABI_LP32 0x00000001 /* LP32 ABI. */ > +#define EF_LARCH_ABI_LPX32 0x00000002 /* LPX32 ABI */ > +#define EF_LARCH_ABI_LP64 0x00000003 /* LP64 ABI */ > +#define EF_LARCH_ABI 0x00000003 > + > +/* LoongArch relocation types used by the dynamic linker */ > +#define R_LARCH_NONE 0 > +#define R_LARCH_32 1 > +#define R_LARCH_64 2 > +#define R_LARCH_RELATIVE 3 > +#define R_LARCH_COPY 4 > +#define R_LARCH_JUMP_SLOT 5 > +#define R_LARCH_TLS_DTPMOD32 6 > +#define R_LARCH_TLS_DTPMOD64 7 > +#define R_LARCH_TLS_DTPREL32 8 > +#define R_LARCH_TLS_DTPREL64 9 > +#define R_LARCH_TLS_TPREL32 10 > +#define R_LARCH_TLS_TPREL64 11 > +#define R_LARCH_IRELATIVE 12 > +#define R_LARCH_MARK_LA 20 > +#define R_LARCH_MARK_PCREL 21 > +#define R_LARCH_SOP_PUSH_PCREL 22 > +#define R_LARCH_SOP_PUSH_ABSOLUTE 23 > +#define R_LARCH_SOP_PUSH_DUP 24 > +#define R_LARCH_SOP_PUSH_GPREL 25 > +#define R_LARCH_SOP_PUSH_TLS_TPREL 26 > +#define R_LARCH_SOP_PUSH_TLS_GOT 27 > +#define R_LARCH_SOP_PUSH_TLS_GD 28 > +#define R_LARCH_SOP_PUSH_PLT_PCREL 29 > +#define R_LARCH_SOP_ASSERT 30 > +#define R_LARCH_SOP_NOT 31 > +#define R_LARCH_SOP_SUB 32 > +#define R_LARCH_SOP_SL 33 > +#define R_LARCH_SOP_SR 34 > +#define R_LARCH_SOP_ADD 35 > +#define R_LARCH_SOP_AND 36 > +#define R_LARCH_SOP_IF_ELSE 37 > +#define R_LARCH_SOP_POP_32_S_10_5 38 > +#define R_LARCH_SOP_POP_32_U_10_12 39 > +#define R_LARCH_SOP_POP_32_S_10_12 40 > +#define R_LARCH_SOP_POP_32_S_10_16 41 > +#define R_LARCH_SOP_POP_32_S_10_16_S2 42 > +#define R_LARCH_SOP_POP_32_S_5_20 43 > +#define R_LARCH_SOP_POP_32_S_0_5_10_16_S2 44 > +#define R_LARCH_SOP_POP_32_S_0_10_10_16_S2 45 > +#define R_LARCH_SOP_POP_32_U 46 > +#define R_LARCH_ADD8 47 > +#define R_LARCH_ADD16 48 > +#define R_LARCH_ADD24 49 > +#define R_LARCH_ADD32 50 > +#define R_LARCH_ADD64 51 > +#define R_LARCH_SUB8 52 > +#define R_LARCH_SUB16 53 > +#define R_LARCH_SUB24 54 > +#define R_LARCH_SUB32 55 > +#define R_LARCH_SUB64 56 > +#define R_LARCH_GNU_VTINHERIT 57 > +#define R_LARCH_GNU_VTENTRY 58 > + > +#ifndef ELF_ARCH > + > +/* ELF register definitions */ > + > +/* > + * General purpose have the following registers: > + * Register Number > + * GPRs 32 > + * EPC 1 > + * BADVADDR 1 > + * CRMD 1 > + * PRMD 1 > + * EUEN 1 > + * ECFG 1 > + * ESTAT 1 > + * Reserved 6 > + */ > +#define ELF_NGREG 45 > + > +/* > + * Floating point have the following registers: > + * Register Number > + * FPR 32 > + * FCC 1 > + * FCSR 1 > + */ > +#define ELF_NFPREG 34 > + > +typedef unsigned long elf_greg_t; > +typedef elf_greg_t elf_gregset_t[ELF_NGREG]; > + > +typedef double elf_fpreg_t; > +typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG]; > + > +void loongarch_dump_regs64(u64 *uregs, const struct pt_regs *regs); > + > +#ifdef CONFIG_32BIT > +/* > + * This is used to ensure we don't load something for the wrong architecture. > + */ > +#define elf_check_arch elf32_check_arch > + > +/* > + * These are used to set parameters in the core dumps. > + */ > +#define ELF_CLASS ELFCLASS32 > + > +#define ELF_CORE_COPY_REGS(dest, regs) \ > + loongarch_dump_regs32((u32 *)&(dest), (regs)); > + > +#endif /* CONFIG_32BIT */ > + > +#ifdef CONFIG_64BIT > +/* > + * This is used to ensure we don't load something for the wrong architecture. > + */ > +#define elf_check_arch elf64_check_arch > + > +/* > + * These are used to set parameters in the core dumps. > + */ > +#define ELF_CLASS ELFCLASS64 > + > +#define ELF_CORE_COPY_REGS(dest, regs) \ > + loongarch_dump_regs64((u64 *)&(dest), (regs)); > + > +#endif /* CONFIG_64BIT */ > + > +/* > + * These are used to set parameters in the core dumps. > + */ > +#define ELF_DATA ELFDATA2LSB > +#define ELF_ARCH EM_LOONGARCH > + > +#endif /* !defined(ELF_ARCH) */ > + > +#define loongarch_elf_check_machine(x) ((x)->e_machine == EM_LOONGARCH) > + > +#define vmcore_elf32_check_arch loongarch_elf_check_machine > +#define vmcore_elf64_check_arch loongarch_elf_check_machine > + > +/* > + * Return non-zero if HDR identifies an 32bit ELF binary. > + */ > +#define elf32_check_arch(hdr) \ > +({ \ > + int __res = 1; \ > + struct elfhdr *__h = (hdr); \ > + \ > + if (!loongarch_elf_check_machine(__h)) \ > + __res = 0; \ > + if (__h->e_ident[EI_CLASS] != ELFCLASS32) \ > + __res = 0; \ > + \ > + __res; \ > +}) > + > +/* > + * Return non-zero if HDR identifies an 64bit ELF binary. > + */ > +#define elf64_check_arch(hdr) \ > +({ \ > + int __res = 1; \ > + struct elfhdr *__h = (hdr); \ > + \ > + if (!loongarch_elf_check_machine(__h)) \ > + __res = 0; \ > + if (__h->e_ident[EI_CLASS] != ELFCLASS64) \ > + __res = 0; \ > + \ > + __res; \ > +}) > + > +struct loongarch_abi; > +extern struct loongarch_abi loongarch_abi; > + > +#ifdef CONFIG_32BIT > + > +#define SET_PERSONALITY2(ex, state) \ > +do { \ > + current->thread.abi = &loongarch_abi; \ > + \ > + loongarch_set_personality_fcsr(state); \ > + \ > + if (personality(current->personality) != PER_LINUX) \ > + set_personality(PER_LINUX); \ > +} while (0) > + > +#endif /* CONFIG_32BIT */ > + > +#ifdef CONFIG_64BIT > + > +#define SET_PERSONALITY2(ex, state) \ > +do { \ > + unsigned int p; \ > + \ > + clear_thread_flag(TIF_32BIT_REGS); \ > + clear_thread_flag(TIF_32BIT_ADDR); \ > + \ > + current->thread.abi = &loongarch_abi; \ > + loongarch_set_personality_fcsr(state); \ > + \ > + p = personality(current->personality); \ > + if (p != PER_LINUX32 && p != PER_LINUX) \ > + set_personality(PER_LINUX); \ > +} while (0) > + > +#endif /* CONFIG_64BIT */ > + > +#define CORE_DUMP_USE_REGSET > +#define ELF_EXEC_PAGESIZE PAGE_SIZE > + > +/* > + * This yields a mask that user programs can use to figure out what > + * instruction set this cpu supports. This could be done in userspace, > + * but it's not easy, and we've already done it here. > + */ > + > +#define ELF_HWCAP (elf_hwcap) > +extern unsigned int elf_hwcap; > +#include > + > +/* > + * This yields a string that ld.so will use to load implementation > + * specific libraries for optimization. This is more specific in > + * intent than poking at uname or /proc/cpuinfo. > + */ > + > +#define ELF_PLATFORM __elf_platform > +extern const char *__elf_platform; > + > +/* The regs[11] (a7) holds the syscall number and should not cleared */ > +#define ELF_PLAT_INIT(_r, load_addr) do { \ > + _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0; \ > + _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0; \ > + _r->regs[9] = _r->regs[10] = _r->regs[12] = _r->regs[13] = 0; \ > + _r->regs[14] = _r->regs[15] = _r->regs[16] = _r->regs[17] = 0; \ > + _r->regs[18] = _r->regs[19] = _r->regs[20] = _r->regs[21] = 0; \ > + _r->regs[22] = _r->regs[23] = _r->regs[24] = _r->regs[25] = 0; \ > + _r->regs[26] = _r->regs[27] = _r->regs[28] = _r->regs[29] = 0; \ > + _r->regs[30] = _r->regs[31] = 0; \ > +} while (0) > + > +/* > + * This is the location that an ET_DYN program is loaded if exec'ed. Typical > + * use of this is to invoke "./ld.so someprog" to test out a new version of > + * the loader. We need to make sure that it is out of the way of the program > + * that it will "exec", and that there is sufficient room for the brk. > + */ > + > +#ifndef ELF_ET_DYN_BASE > +#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) > +#endif > + > +/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ > +#define ARCH_DLINFO \ > +do { \ > + NEW_AUX_ENT(AT_SYSINFO_EHDR, \ > + (unsigned long)current->mm->context.vdso); \ > +} while (0) > + > +#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 > +struct linux_binprm; > +extern int arch_setup_additional_pages(struct linux_binprm *bprm, > + int uses_interp); > + > +struct arch_elf_state { > + int fp_abi; > + int interp_fp_abi; > +}; > + > +#define LOONGARCH_ABI_FP_ANY (0) > + > +#define INIT_ARCH_ELF_STATE { \ > + .fp_abi = LOONGARCH_ABI_FP_ANY, \ > + .interp_fp_abi = LOONGARCH_ABI_FP_ANY, \ > +} > + > + > +extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf, > + bool is_interp, struct arch_elf_state *state); > + > +extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr, > + struct arch_elf_state *state); > + > +extern void loongarch_set_personality_fcsr(struct arch_elf_state *state); > + > +#define elf_read_implies_exec(ex, stk) loongarch_elf_read_implies_exec(&(ex), stk) > +extern int loongarch_elf_read_implies_exec(void *elf_ex, int exstack); > + > +#endif /* _ASM_ELF_H */ > diff --git a/arch/loongarch/include/asm/exec.h b/arch/loongarch/include/asm/exec.h > new file mode 100644 > index 000000000000..00df07ce3529 > --- /dev/null > +++ b/arch/loongarch/include/asm/exec.h > @@ -0,0 +1,10 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited > + */ > +#ifndef _ASM_EXEC_H > +#define _ASM_EXEC_H > + > +extern unsigned long arch_align_stack(unsigned long sp); > + > +#endif /* _ASM_EXEC_H */ > diff --git a/arch/loongarch/include/asm/module.h b/arch/loongarch/include/asm/module.h > new file mode 100644 > index 000000000000..6df72c6228e0 > --- /dev/null > +++ b/arch/loongarch/include/asm/module.h > @@ -0,0 +1,15 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited > + */ > +#ifndef _ASM_MODULE_H > +#define _ASM_MODULE_H > + > +#include > + > +#define RELA_STACK_DEPTH 16 > + > +struct mod_arch_specific { > +}; > + > +#endif /* _ASM_MODULE_H */ > diff --git a/arch/loongarch/include/asm/vermagic.h b/arch/loongarch/include/asm/vermagic.h > new file mode 100644 > index 000000000000..9882dfd4702a > --- /dev/null > +++ b/arch/loongarch/include/asm/vermagic.h > @@ -0,0 +1,19 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited > + */ > +#ifndef _ASM_VERMAGIC_H > +#define _ASM_VERMAGIC_H > + > +#define MODULE_PROC_FAMILY "LOONGARCH " > + > +#ifdef CONFIG_32BIT > +#define MODULE_KERNEL_TYPE "32BIT " > +#elif defined CONFIG_64BIT > +#define MODULE_KERNEL_TYPE "64BIT " > +#endif > + > +#define MODULE_ARCH_VERMAGIC \ > + MODULE_PROC_FAMILY MODULE_KERNEL_TYPE > + > +#endif /* _ASM_VERMAGIC_H */ > diff --git a/arch/loongarch/include/uapi/asm/auxvec.h b/arch/loongarch/include/uapi/asm/auxvec.h > new file mode 100644 > index 000000000000..5a2200fd75bf > --- /dev/null > +++ b/arch/loongarch/include/uapi/asm/auxvec.h > @@ -0,0 +1,17 @@ > +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ > +/* > + * Author: Hanlu Li > + * Huacai Chen > + * > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited > + */ > + > +#ifndef __ASM_AUXVEC_H > +#define __ASM_AUXVEC_H > + > +/* Location of VDSO image. */ > +#define AT_SYSINFO_EHDR 33 > + > +#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */ > + > +#endif /* __ASM_AUXVEC_H */ > diff --git a/arch/loongarch/include/uapi/asm/hwcap.h b/arch/loongarch/include/uapi/asm/hwcap.h > new file mode 100644 > index 000000000000..8840b72fa8e8 > --- /dev/null > +++ b/arch/loongarch/include/uapi/asm/hwcap.h > @@ -0,0 +1,20 @@ > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ > +#ifndef _UAPI_ASM_HWCAP_H > +#define _UAPI_ASM_HWCAP_H > + > +/* HWCAP flags */ > +#define HWCAP_LOONGARCH_CPUCFG (1 << 0) > +#define HWCAP_LOONGARCH_LAM (1 << 1) > +#define HWCAP_LOONGARCH_UAL (1 << 2) > +#define HWCAP_LOONGARCH_FPU (1 << 3) > +#define HWCAP_LOONGARCH_LSX (1 << 4) > +#define HWCAP_LOONGARCH_LASX (1 << 5) > +#define HWCAP_LOONGARCH_CRC32 (1 << 6) > +#define HWCAP_LOONGARCH_COMPLEX (1 << 7) > +#define HWCAP_LOONGARCH_CRYPTO (1 << 8) > +#define HWCAP_LOONGARCH_LVZ (1 << 9) > +#define HWCAP_LOONGARCH_LBT_X86 (1 << 10) > +#define HWCAP_LOONGARCH_LBT_ARM (1 << 11) > +#define HWCAP_LOONGARCH_LBT_MIPS (1 << 12) > + > +#endif /* _UAPI_ASM_HWCAP_H */ > diff --git a/arch/loongarch/kernel/elf.c b/arch/loongarch/kernel/elf.c > new file mode 100644 > index 000000000000..072dfd40f0b5 > --- /dev/null > +++ b/arch/loongarch/kernel/elf.c > @@ -0,0 +1,41 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Author: Huacai Chen > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited > + */ > + > +#include > +#include > +#include > +#include > + > +#include > +#include > + > +int arch_elf_pt_proc(void *_ehdr, void *_phdr, struct file *elf, > + bool is_interp, struct arch_elf_state *state) > +{ > + return 0; > +} > + > +int arch_check_elf(void *_ehdr, bool has_interpreter, void *_interp_ehdr, > + struct arch_elf_state *state) > +{ > + return 0; > +} > + > +void loongarch_set_personality_fcsr(struct arch_elf_state *state) > +{ > + current->thread.fpu.fcsr = boot_cpu_data.fpu_csr0; > +} > + > +int loongarch_elf_read_implies_exec(void *elf_ex, int exstack) > +{ > + if (exstack != EXSTACK_DISABLE_X) { > + /* The binary doesn't request a non-executable stack */ > + return 1; > + } > + > + return 0; > +} > +EXPORT_SYMBOL(loongarch_elf_read_implies_exec); > diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c > new file mode 100644 > index 000000000000..af7c403b032b > --- /dev/null > +++ b/arch/loongarch/kernel/module.c > @@ -0,0 +1,652 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Author: Hanlu Li > + * Huacai Chen > + * > + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited > + */ > + > +#undef DEBUG > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +static int rela_stack_push(s64 stack_value, s64 *rela_stack, size_t *rela_stack_top) > +{ > + if (*rela_stack_top >= RELA_STACK_DEPTH) > + return -ENOEXEC; > + > + rela_stack[(*rela_stack_top)++] = stack_value; > + pr_debug("%s stack_value = 0x%llx\n", __func__, stack_value); > + > + return 0; > +} > + > +static int rela_stack_pop(s64 *stack_value, s64 *rela_stack, size_t *rela_stack_top) > +{ > + if (*rela_stack_top == 0) > + return -ENOEXEC; > + > + *stack_value = rela_stack[--(*rela_stack_top)]; > + pr_debug("%s stack_value = 0x%llx\n", __func__, *stack_value); > + > + return 0; > +} > + > +static int apply_r_larch_none(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + return 0; > +} > + > +static int apply_r_larch_32(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + *location = v; > + return 0; > +} > + > +static int apply_r_larch_64(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + *(Elf_Addr *)location = v; > + return 0; > +} > + > +static int apply_r_larch_mark_la(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + return 0; > +} > + > +static int apply_r_larch_mark_pcrel(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + return 0; > +} > + > +static int apply_r_larch_sop_push_pcrel(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + return rela_stack_push(v - (u64)location, rela_stack, rela_stack_top); > +} > + > +static int apply_r_larch_sop_push_absolute(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + return rela_stack_push(v, rela_stack, rela_stack_top); > +} > + > +static int apply_r_larch_sop_push_dup(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_push(opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_push(opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + return 0; > +} > + > +static int apply_r_larch_sop_push_plt_pcrel(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + return apply_r_larch_sop_push_pcrel(me, location, v, rela_stack, rela_stack_top); > +} > + > +static int apply_r_larch_sop_sub(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1, opr2; > + > + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_push(opr1 - opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + return 0; > +} > + > +static int apply_r_larch_sop_sl(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1, opr2; > + > + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_push(opr1 << opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + return 0; > +} > + > +static int apply_r_larch_sop_sr(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1, opr2; > + > + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_push(opr1 >> opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + return 0; > +} > + > +static int apply_r_larch_sop_add(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1, opr2; > + > + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_push(opr1 + opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + return 0; > +} > +static int apply_r_larch_sop_and(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1, opr2; > + > + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_push(opr1 & opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + return 0; > +} > + > +static int apply_r_larch_sop_if_else(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1, opr2, opr3; > + > + err = rela_stack_pop(&opr3, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_pop(&opr2, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + err = rela_stack_push(opr1 ? opr2 : opr3, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_s_10_5(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 5-bit signed */ > + if ((opr1 & ~(u64)0xf) && > + (opr1 & ~(u64)0xf) != ~(u64)0xf) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* (*(uint32_t *) PC) [14 ... 10] = opr [4 ... 0] */ > + *location = (*location & (~(u32)0x7c00)) | ((opr1 & 0x1f) << 10); > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_u_10_12(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 12-bit unsigned */ > + if (opr1 & ~(u64)0xfff) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* (*(uint32_t *) PC) [21 ... 10] = opr [11 ... 0] */ > + *location = (*location & (~(u32)0x3ffc00)) | ((opr1 & 0xfff) << 10); > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_s_10_12(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 12-bit signed */ > + if ((opr1 & ~(u64)0x7ff) && > + (opr1 & ~(u64)0x7ff) != ~(u64)0x7ff) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* (*(uint32_t *) PC) [21 ... 10] = opr [11 ... 0] */ > + *location = (*location & (~(u32)0x3ffc00)) | ((opr1 & 0xfff) << 10); > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_s_10_16(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 16-bit signed */ > + if ((opr1 & ~(u64)0x7fff) && > + (opr1 & ~(u64)0x7fff) != ~(u64)0x7fff) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* (*(uint32_t *) PC) [25 ... 10] = opr [15 ... 0] */ > + *location = (*location & 0xfc0003ff) | ((opr1 & 0xffff) << 10); > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_s_10_16_s2(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 4-aligned */ > + if (opr1 % 4) { > + pr_err("module %s: opr1 = 0x%llx unaligned! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + opr1 >>= 2; > + /* check 18-bit signed */ > + if ((opr1 & ~(u64)0x7fff) && > + (opr1 & ~(u64)0x7fff) != ~(u64)0x7fff) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* (*(uint32_t *) PC) [25 ... 10] = opr [17 ... 2] */ > + *location = (*location & 0xfc0003ff) | ((opr1 & 0xffff) << 10); > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_s_5_20(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 20-bit signed */ > + if ((opr1 & ~(u64)0x7ffff) && > + (opr1 & ~(u64)0x7ffff) != ~(u64)0x7ffff) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* (*(uint32_t *) PC) [24 ... 5] = opr [19 ... 0] */ > + *location = (*location & (~(u32)0x1ffffe0)) | ((opr1 & 0xfffff) << 5); > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_s_0_5_10_16_s2(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 4-aligned */ > + if (opr1 % 4) { > + pr_err("module %s: opr1 = 0x%llx unaligned! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + opr1 >>= 2; > + /* check 23-bit signed */ > + if ((opr1 & ~(u64)0xfffff) && > + (opr1 & ~(u64)0xfffff) != ~(u64)0xfffff) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* > + * (*(uint32_t *) PC) [4 ... 0] = opr [22 ... 18] > + * (*(uint32_t *) PC) [25 ... 10] = opr [17 ... 2] > + */ > + *location = (*location & 0xfc0003e0) > + | ((opr1 & 0x1f0000) >> 16) | ((opr1 & 0xffff) << 10); > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_s_0_10_10_16_s2(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 4-aligned */ > + if (opr1 % 4) { > + pr_err("module %s: opr1 = 0x%llx unaligned! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + opr1 >>= 2; > + /* check 28-bit signed */ > + if ((opr1 & ~(u64)0x1ffffff) && > + (opr1 & ~(u64)0x1ffffff) != ~(u64)0x1ffffff) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* > + * (*(uint32_t *) PC) [9 ... 0] = opr [27 ... 18] > + * (*(uint32_t *) PC) [25 ... 10] = opr [17 ... 2] > + */ > + *location = (*location & 0xfc000000) > + | ((opr1 & 0x3ff0000) >> 16) | ((opr1 & 0xffff) << 10); > + > + return 0; > +} > + > +static int apply_r_larch_sop_pop_32_u(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + int err = 0; > + s64 opr1; > + > + err = rela_stack_pop(&opr1, rela_stack, rela_stack_top); > + if (err) > + return err; > + > + /* check 32-bit unsigned */ > + if (opr1 & ~(u64)0xffffffff) { > + pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s relocation\n", > + me->name, opr1, __func__); > + return -ENOEXEC; > + } > + > + /* (*(uint32_t *) PC) = opr */ > + *location = (u32)opr1; > + > + return 0; > +} > + > +static int apply_r_larch_add32(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + *(s32 *)location += v; > + return 0; > +} > + > +static int apply_r_larch_add64(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + *(s64 *)location += v; > + return 0; > +} > + > +static int apply_r_larch_sub32(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + *(s32 *)location -= v; > + return 0; > +} > + > +static int apply_r_larch_sub64(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top) > +{ > + *(s64 *)location -= v; > + return 0; > +} > + > +/* > + * reloc_handlers_rela() - Apply a particular relocation to a module > + * @me: the module to apply the reloc to > + * @location: the address at which the reloc is to be applied > + * @v: the value of the reloc, with addend for RELA-style > + * @rela_stack: the stack used for store relocation info, LOCAL to THIS module > + * @rela_stac_top: where the stack operation(pop/push) applies to > + * > + * Return: 0 upon success, else -ERRNO > + */ > +typedef int (*reloc_rela_handler)(struct module *me, u32 *location, Elf_Addr v, > + s64 *rela_stack, size_t *rela_stack_top); > + > +/* The handlers for known reloc types */ > +static reloc_rela_handler reloc_rela_handlers[] = { > + [R_LARCH_NONE] = apply_r_larch_none, > + [R_LARCH_32] = apply_r_larch_32, > + [R_LARCH_64] = apply_r_larch_64, > + [R_LARCH_MARK_LA] = apply_r_larch_mark_la, > + [R_LARCH_MARK_PCREL] = apply_r_larch_mark_pcrel, > + [R_LARCH_SOP_PUSH_PCREL] = apply_r_larch_sop_push_pcrel, > + [R_LARCH_SOP_PUSH_ABSOLUTE] = apply_r_larch_sop_push_absolute, > + [R_LARCH_SOP_PUSH_DUP] = apply_r_larch_sop_push_dup, > + [R_LARCH_SOP_PUSH_PLT_PCREL] = apply_r_larch_sop_push_plt_pcrel, > + [R_LARCH_SOP_SUB] = apply_r_larch_sop_sub, > + [R_LARCH_SOP_SL] = apply_r_larch_sop_sl, > + [R_LARCH_SOP_SR] = apply_r_larch_sop_sr, > + [R_LARCH_SOP_ADD] = apply_r_larch_sop_add, > + [R_LARCH_SOP_AND] = apply_r_larch_sop_and, > + [R_LARCH_SOP_IF_ELSE] = apply_r_larch_sop_if_else, > + [R_LARCH_SOP_POP_32_S_10_5] = apply_r_larch_sop_pop_32_s_10_5, > + [R_LARCH_SOP_POP_32_U_10_12] = apply_r_larch_sop_pop_32_u_10_12, > + [R_LARCH_SOP_POP_32_S_10_12] = apply_r_larch_sop_pop_32_s_10_12, > + [R_LARCH_SOP_POP_32_S_10_16] = apply_r_larch_sop_pop_32_s_10_16, > + [R_LARCH_SOP_POP_32_S_10_16_S2] = apply_r_larch_sop_pop_32_s_10_16_s2, > + [R_LARCH_SOP_POP_32_S_5_20] = apply_r_larch_sop_pop_32_s_5_20, > + [R_LARCH_SOP_POP_32_S_0_5_10_16_S2] = apply_r_larch_sop_pop_32_s_0_5_10_16_s2, > + [R_LARCH_SOP_POP_32_S_0_10_10_16_S2] = apply_r_larch_sop_pop_32_s_0_10_10_16_s2, > + [R_LARCH_SOP_POP_32_U] = apply_r_larch_sop_pop_32_u, > + [R_LARCH_ADD32] = apply_r_larch_add32, > + [R_LARCH_ADD64] = apply_r_larch_add64, > + [R_LARCH_SUB32] = apply_r_larch_sub32, > + [R_LARCH_SUB64] = apply_r_larch_sub64, > +}; > + > +int apply_relocate(Elf_Shdr *sechdrs, const char *strtab, > + unsigned int symindex, unsigned int relsec, > + struct module *me) > +{ > + int i, err; > + unsigned int type; > + s64 rela_stack[RELA_STACK_DEPTH]; > + size_t rela_stack_top = 0; > + reloc_rela_handler handler; > + void *location; > + Elf_Addr v; > + Elf_Sym *sym; > + Elf_Rel *rel = (void *) sechdrs[relsec].sh_addr; > + > + pr_debug("%s: Applying relocate section %u to %u\n", __func__, relsec, > + sechdrs[relsec].sh_info); > + > + rela_stack_top = 0; > + 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_R_SYM(rel[i].r_info); > + if (IS_ERR_VALUE(sym->st_value)) { > + /* Ignore unresolved weak symbol */ > + if (ELF_ST_BIND(sym->st_info) == STB_WEAK) > + continue; > + pr_warn("%s: Unknown symbol %s\n", me->name, strtab + sym->st_name); > + return -ENOENT; > + } > + > + type = ELF_R_TYPE(rel[i].r_info); > + > + if (type < ARRAY_SIZE(reloc_rela_handlers)) > + handler = reloc_rela_handlers[type]; > + else > + handler = NULL; > + > + if (!handler) { > + pr_err("%s: Unknown relocation type %u\n", me->name, type); > + return -EINVAL; > + } > + > + v = sym->st_value; > + err = handler(me, location, v, rela_stack, &rela_stack_top); > + if (err) > + return err; > + } > + > + return 0; > +} > + > +int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, > + unsigned int symindex, unsigned int relsec, > + struct module *me) > +{ > + int i, err; > + unsigned int type; > + s64 rela_stack[RELA_STACK_DEPTH]; > + size_t rela_stack_top = 0; > + reloc_rela_handler handler; > + void *location; > + Elf_Addr v; > + Elf_Sym *sym; > + Elf_Rela *rel = (void *) sechdrs[relsec].sh_addr; > + > + pr_debug("%s: Applying relocate section %u to %u\n", __func__, relsec, > + sechdrs[relsec].sh_info); > + > + rela_stack_top = 0; > + 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_R_SYM(rel[i].r_info); > + if (IS_ERR_VALUE(sym->st_value)) { > + /* Ignore unresolved weak symbol */ > + if (ELF_ST_BIND(sym->st_info) == STB_WEAK) > + continue; > + pr_warn("%s: Unknown symbol %s\n", me->name, strtab + sym->st_name); > + return -ENOENT; > + } > + > + type = ELF_R_TYPE(rel[i].r_info); > + > + if (type < ARRAY_SIZE(reloc_rela_handlers)) > + handler = reloc_rela_handlers[type]; > + else > + handler = NULL; > + > + if (!handler) { > + pr_err("%s: Unknown relocation type %u\n", me->name, type); > + return -EINVAL; > + } > + > + pr_debug("type %d st_value %llx r_addend %llx loc %llx\n", > + (int)ELF64_R_TYPE(rel[i].r_info), > + sym->st_value, rel[i].r_addend, (u64)location); > + > + v = sym->st_value + rel[i].r_addend; > + err = handler(me, location, v, rela_stack, &rela_stack_top); > + if (err) > + return err; > + } > + > + return 0; > +} > -- > 2.27.0 >