From: ard.biesheuvel@linaro.org (Ard Biesheuvel) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 4/9] x86: add support for 64-bit place relative relocations Date: Tue, 18 Sep 2018 23:51:39 -0700 Message-ID: <20180919065144.25010-5-ard.biesheuvel@linaro.org> (raw) In-Reply-To: <20180919065144.25010-1-ard.biesheuvel@linaro.org> Add support for R_X86_64_PC64 relocations, which operate on 64-bit quantities holding a relative symbol reference. Also remove the definition of R_X86_64_NUM: given that it is currently unused, it is unclear what the new value should be. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- arch/x86/include/asm/elf.h | 3 +-- arch/x86/kernel/module.c | 6 ++++++ arch/x86/tools/relocs.c | 10 ++++++++++ arch/x86/um/asm/elf.h | 3 +-- 4 files changed, 18 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index 0d157d2a1e2a..a357031d85b5 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -62,8 +62,7 @@ typedef struct user_fxsr_struct elf_fpxregset_t; #define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */ #define R_X86_64_8 14 /* Direct 8 bit sign extended */ #define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */ - -#define R_X86_64_NUM 16 +#define R_X86_64_PC64 24 /* Place relative 64-bit signed */ /* * These are used to set parameters in the core dumps. diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c index f58336af095c..b052e883dd8c 100644 --- a/arch/x86/kernel/module.c +++ b/arch/x86/kernel/module.c @@ -201,6 +201,12 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, goto overflow; #endif break; + case R_X86_64_PC64: + if (*(u64 *)loc != 0) + goto invalid_relocation; + val -= (u64)loc; + *(u64 *)loc = val; + break; default: pr_err("%s: Unknown rela relocation: %llu\n", me->name, ELF64_R_TYPE(rel[i].r_info)); diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c index 3a6c8ebc8032..0b08067c45f3 100644 --- a/arch/x86/tools/relocs.c +++ b/arch/x86/tools/relocs.c @@ -196,6 +196,7 @@ static const char *rel_type(unsigned type) #if ELF_BITS == 64 REL_TYPE(R_X86_64_NONE), REL_TYPE(R_X86_64_64), + REL_TYPE(R_X86_64_PC64), REL_TYPE(R_X86_64_PC32), REL_TYPE(R_X86_64_GOT32), REL_TYPE(R_X86_64_PLT32), @@ -782,6 +783,15 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym, add_reloc(&relocs32neg, offset); break; + case R_X86_64_PC64: + /* + * Only used by jump labels + */ + if (is_percpu_sym(sym, symname)) + die("Invalid R_X86_64_PC64 relocation against per-CPU symbol %s\n", + symname); + break; + case R_X86_64_32: case R_X86_64_32S: case R_X86_64_64: diff --git a/arch/x86/um/asm/elf.h b/arch/x86/um/asm/elf.h index 548197212a45..413f3519d9a1 100644 --- a/arch/x86/um/asm/elf.h +++ b/arch/x86/um/asm/elf.h @@ -116,8 +116,7 @@ do { \ #define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */ #define R_X86_64_8 14 /* Direct 8 bit sign extended */ #define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */ - -#define R_X86_64_NUM 16 +#define R_X86_64_PC64 24 /* Place relative 64-bit signed */ /* * This is used to ensure we don't load something for the wrong architecture. -- 2.17.1
next prev parent reply index Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-09-19 6:51 [PATCH v3 0/9] add support for relative references in jump tables Ard Biesheuvel 2018-09-19 6:51 ` [PATCH v3 1/9] kernel/jump_label: abstract jump_entry member accessors Ard Biesheuvel 2018-09-19 6:51 ` [PATCH v3 2/9] kernel/jump_label: implement generic support for relative references Ard Biesheuvel 2018-09-19 6:51 ` [PATCH v3 3/9] arm64/kernel: jump_label: switch to " Ard Biesheuvel 2018-09-19 6:51 ` Ard Biesheuvel [this message] 2018-09-19 6:51 ` [PATCH v3 5/9] x86: jump_label: switch to jump_entry accessors Ard Biesheuvel 2018-09-19 6:51 ` [PATCH v3 6/9] x86/kernel: jump_table: use relative references Ard Biesheuvel 2018-09-19 6:51 ` [PATCH v3 7/9] jump_label: annotate entries that operate on __init code earlier Ard Biesheuvel 2018-09-19 6:51 ` [PATCH v3 8/9] jump_table: move entries into ro_after_init region Ard Biesheuvel 2018-09-30 15:42 ` Guenter Roeck 2018-09-19 6:51 ` [PATCH v3 9/9] s390/jump_label: switch to relative references Ard Biesheuvel 2018-09-19 13:08 ` [PATCH v3 0/9] add support for relative references in jump tables Peter Zijlstra 2018-09-27 15:22 ` Ard Biesheuvel 2018-09-27 15:46 ` Kees Cook
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20180919065144.25010-5-ard.biesheuvel@linaro.org \ --to=ard.biesheuvel@linaro.org \ --cc=linux-arm-kernel@lists.infradead.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: link
Linux-ARM-Kernel Archive on lore.kernel.org Archives are clonable: git clone --mirror https://lore.kernel.org/linux-arm-kernel/0 linux-arm-kernel/git/0.git git clone --mirror https://lore.kernel.org/linux-arm-kernel/1 linux-arm-kernel/git/1.git # If you have public-inbox 1.1+ installed, you may # initialize and index your mirror using the following commands: public-inbox-init -V2 linux-arm-kernel linux-arm-kernel/ https://lore.kernel.org/linux-arm-kernel \ linux-arm-kernel@lists.infradead.org public-inbox-index linux-arm-kernel Example config snippet for mirrors Newsgroup available over NNTP: nntp://nntp.lore.kernel.org/org.infradead.lists.linux-arm-kernel AGPL code for this site: git clone https://public-inbox.org/public-inbox.git