From patchwork Thu Mar 31 07:52:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 1611607 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4KTbBc5LyRz9sG9 for ; Thu, 31 Mar 2022 18:52:56 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4KTbBc2Dwsz30BP for ; Thu, 31 Mar 2022 18:52:56 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=csgroup.eu (client-ip=93.17.235.10; helo=pegase2.c-s.fr; envelope-from=christophe.leroy@csgroup.eu; receiver=) Received: from pegase2.c-s.fr (pegase2.c-s.fr [93.17.235.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4KTbBN3g8Bz2yJF for ; Thu, 31 Mar 2022 18:52:42 +1100 (AEDT) Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4KTbBD4vh7z9sSJ; Thu, 31 Mar 2022 09:52:36 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A23Q6gpcXcvo; Thu, 31 Mar 2022 09:52:36 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4KTbBD3p86z9sRn; Thu, 31 Mar 2022 09:52:36 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 6C3488B77D; Thu, 31 Mar 2022 09:52:36 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id ZwFf59aMvFSQ; Thu, 31 Mar 2022 09:52:36 +0200 (CEST) Received: from PO20335.IDSI0.si.c-s.fr (unknown [192.168.202.54]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 151C48B764; Thu, 31 Mar 2022 09:52:36 +0200 (CEST) Received: from PO20335.IDSI0.si.c-s.fr (localhost [127.0.0.1]) by PO20335.IDSI0.si.c-s.fr (8.17.1/8.16.1) with ESMTPS id 22V7qKcB542939 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Thu, 31 Mar 2022 09:52:20 +0200 Received: (from chleroy@localhost) by PO20335.IDSI0.si.c-s.fr (8.17.1/8.17.1/Submit) id 22V7qJCt542937; Thu, 31 Mar 2022 09:52:19 +0200 X-Authentication-Warning: PO20335.IDSI0.si.c-s.fr: chleroy set sender to christophe.leroy@csgroup.eu using -f From: Christophe Leroy To: Sathvika Vasireddy , Josh Poimboeuf , Peter Zijlstra Subject: [RFC PATCH v1] objtool: Use target file endianness instead of a compiled constant Date: Thu, 31 Mar 2022 09:52:07 +0200 Message-Id: <7c503552c4bc1f0e1aa4775765f8f24e9d1b0a04.1648713067.git.christophe.leroy@csgroup.eu> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1648713075; l=5561; s=20211009; h=from:subject:message-id; bh=EDewoNRMBMBkXLY0AaVKS47w2S/gACMGaekn72IAaAU=; b=RsSsV04+A6LOiharLqbqzeCWJKxN1Xi0ltUroWmT3OCF+e33GPdH0Vd4W/AVcnNddUCCyiNXOA0u IsP2ZyzIBApS2HBmJTRy8Cof6oZvCzjjNO3siBG0F3DvEN8Kpu2y X-Developer-Key: i=christophe.leroy@csgroup.eu; a=ed25519; pk=HIzTzUj91asvincQGOFx6+ZF5AoUuP9GdOtQChs7Mm0= X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Some architectures like powerpc support both endianness, it's therefore not possible to fix the endianness via arch/endianness.h because there is no easy way to get the target endianness at build time. Use the endianness recorded in the file objtool is working on. Signed-off-by: Christophe Leroy --- .../arch/x86/include/arch/endianness.h | 9 ------ tools/objtool/check.c | 2 +- tools/objtool/include/objtool/endianness.h | 29 +++++++++---------- tools/objtool/orc_dump.c | 4 +-- tools/objtool/orc_gen.c | 4 +-- tools/objtool/special.c | 3 +- 6 files changed, 20 insertions(+), 31 deletions(-) delete mode 100644 tools/objtool/arch/x86/include/arch/endianness.h diff --git a/tools/objtool/arch/x86/include/arch/endianness.h b/tools/objtool/arch/x86/include/arch/endianness.h deleted file mode 100644 index 7c362527da20..000000000000 --- a/tools/objtool/arch/x86/include/arch/endianness.h +++ /dev/null @@ -1,9 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -#ifndef _ARCH_ENDIANNESS_H -#define _ARCH_ENDIANNESS_H - -#include - -#define __TARGET_BYTE_ORDER __LITTLE_ENDIAN - -#endif /* _ARCH_ENDIANNESS_H */ diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 6de5085e3e5a..378d4e2de285 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1941,7 +1941,7 @@ static int read_unwind_hints(struct objtool_file *file) return -1; } - cfi.cfa.offset = bswap_if_needed(hint->sp_offset); + cfi.cfa.offset = bswap_if_needed(&file->elf->ehdr, hint->sp_offset); cfi.type = hint->type; cfi.end = hint->end; diff --git a/tools/objtool/include/objtool/endianness.h b/tools/objtool/include/objtool/endianness.h index 10241341eff3..2c7469a7645b 100644 --- a/tools/objtool/include/objtool/endianness.h +++ b/tools/objtool/include/objtool/endianness.h @@ -2,33 +2,30 @@ #ifndef _OBJTOOL_ENDIANNESS_H #define _OBJTOOL_ENDIANNESS_H -#include #include #include - -#ifndef __TARGET_BYTE_ORDER -#error undefined arch __TARGET_BYTE_ORDER -#endif - -#if __BYTE_ORDER != __TARGET_BYTE_ORDER -#define __NEED_BSWAP 1 -#else -#define __NEED_BSWAP 0 -#endif +#include /* - * Does a byte swap if target endianness doesn't match the host, i.e. cross + * Does a byte swap if target file endianness doesn't match the host, i.e. cross * compilation for little endian on big endian and vice versa. * To be used for multi-byte values conversion, which are read from / about * to be written to a target native endianness ELF file. */ -#define bswap_if_needed(val) \ +static inline bool need_bswap(GElf_Ehdr *ehdr) +{ + return (__BYTE_ORDER == __LITTLE_ENDIAN) ^ + (ehdr->e_ident[EI_DATA] == ELFDATA2LSB); +} + +#define bswap_if_needed(ehdr, val) \ ({ \ __typeof__(val) __ret; \ + bool __need_bswap = need_bswap(ehdr); \ switch (sizeof(val)) { \ - case 8: __ret = __NEED_BSWAP ? bswap_64(val) : (val); break; \ - case 4: __ret = __NEED_BSWAP ? bswap_32(val) : (val); break; \ - case 2: __ret = __NEED_BSWAP ? bswap_16(val) : (val); break; \ + case 8: __ret = __need_bswap ? bswap_64(val) : (val); break; \ + case 4: __ret = __need_bswap ? bswap_32(val) : (val); break; \ + case 2: __ret = __need_bswap ? bswap_16(val) : (val); break; \ default: \ BUILD_BUG(); break; \ } \ diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c index f5a8508c42d6..5a51586c6ad2 100644 --- a/tools/objtool/orc_dump.c +++ b/tools/objtool/orc_dump.c @@ -198,11 +198,11 @@ int orc_dump(const char *_objname) printf(" sp:"); - print_reg(orc[i].sp_reg, bswap_if_needed(orc[i].sp_offset)); + print_reg(orc[i].sp_reg, bswap_if_needed(elf64_getehdr(elf), orc[i].sp_offset)); printf(" bp:"); - print_reg(orc[i].bp_reg, bswap_if_needed(orc[i].bp_offset)); + print_reg(orc[i].bp_reg, bswap_if_needed(elf64_getehdr(elf), orc[i].bp_offset)); printf(" type:%s end:%d\n", orc_type_name(orc[i].type), orc[i].end); diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c index dd3c64af9db2..63c36ed284a5 100644 --- a/tools/objtool/orc_gen.c +++ b/tools/objtool/orc_gen.c @@ -97,8 +97,8 @@ static int write_orc_entry(struct elf *elf, struct section *orc_sec, /* populate ORC data */ orc = (struct orc_entry *)orc_sec->data->d_buf + idx; memcpy(orc, o, sizeof(*orc)); - orc->sp_offset = bswap_if_needed(orc->sp_offset); - orc->bp_offset = bswap_if_needed(orc->bp_offset); + orc->sp_offset = bswap_if_needed(&elf->ehdr, orc->sp_offset); + orc->bp_offset = bswap_if_needed(&elf->ehdr, orc->bp_offset); /* populate reloc for ip */ if (elf_add_reloc_to_insn(elf, ip_sec, idx * sizeof(int), R_X86_64_PC32, diff --git a/tools/objtool/special.c b/tools/objtool/special.c index e2223dd91c37..ae563c524416 100644 --- a/tools/objtool/special.c +++ b/tools/objtool/special.c @@ -87,7 +87,8 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry, if (entry->feature) { unsigned short feature; - feature = bswap_if_needed(*(unsigned short *)(sec->data->d_buf + + feature = bswap_if_needed(&elf->ehdr, + *(unsigned short *)(sec->data->d_buf + offset + entry->feature)); arch_handle_alternative(feature, alt);