From nobody Fri Nov 29 02:47:44 2024 Received: from mail-wm1-f74.google.com (mail-wm1-f74.google.com [209.85.128.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 177F219FA76 for ; Wed, 25 Sep 2024 15:03:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727276587; cv=none; b=oPQxp/TTTdmCyVSC2Zgc/wy3wcQQdMYjCq763FUJrEolJGrunVYtdM9lEP25ou94f6gUyKSA0TlsML2S3yaE2c9caQamaFIh4+05K+reWNO1nyHCdn7/mBTA9fFf+1iMyw9G+V34ugbJYjYbHWPARMXdspXajxbZ51p9lhXzFzU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727276587; c=relaxed/simple; bh=YvM9TRdamHMMVDaQnr/PY1VL/3cpzPBrLHBshWo7LWw=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=CWT9BBi+nFZLqmVAaW2opJ8nfiJS9wXD1vBM4gJm5U5ExW+tN7UPLdyewOdWlM6nceURx7EDlwGpftHmVzqsjHafyILi4pRhvZHFyEBer/E3KXwqirS/xa2Bj1C8Cp4e5HX0rxPp4ohbj9eJ9+X7gJ1fbrgPxCwoW1Y5TAPEp+A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ardb.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=ongWkgeN; arc=none smtp.client-ip=209.85.128.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--ardb.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ongWkgeN" Received: by mail-wm1-f74.google.com with SMTP id 5b1f17b1804b1-42cbcf60722so52510645e9.1 for ; Wed, 25 Sep 2024 08:03:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1727276581; x=1727881381; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=H/fxT1DdHMwMyeW8np4BBTWW8phQCD6XQ4SETP482c8=; b=ongWkgeNEUsXO/yFix7MO/NjZ2xvYjoDtIUAZporkb9MuWeyH9GspZlyxNuptzMS9z 27Wcx+k6toKj75Lqn7eTnYkTBw2H2B/ooJKtEmb4PCjaA7tabdO0KaZ0MASZ2VwCe6tF dCZWRxhB0Df0qIrum8EqqV+z13+lw9hhfUWtEGwpL0BsUWnrImwdQkmrlVuWFiGfgQHl eZS6XOrp4ju9m/p48G2u5gOy3ga2/DqLQRrgaaVl4yJsa7a2bT7kHX5MYA4LyuWo4zSD gRzCcLC+XGFxdW9bdOm28v1dXeZRvGrlwwA3ODwA2n6vokwpU4qtgvNJ+5kk0Dpe76FB qzQg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727276581; x=1727881381; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=H/fxT1DdHMwMyeW8np4BBTWW8phQCD6XQ4SETP482c8=; b=TBZt1UfndPrVyk+YXC7p+hQ+phTJvKHh3Uh9Bqshc3s9TymdnqooPXjA87eBUIKZcf X6/JC3GZIeZUZlA5fAuRfWJ73pdHhfWGzY66h/rK4bEgZuXuKIYBT7gAkkZXDKjcmMYX cYwJeYobNFa3VmzmghXUp84HOSC+Spjz1czaSB8CEj9xryS9+TaR1MERbdX8JJM9eOAv Lyy5pDzcEBNajybDNFSkaG0MJs+K1RVW7Fl6nrbdbFYbyN1ZAtgFPbovuSdzbvhEu0b5 5evtc4+Sr2QRvvtVLGkueZ0IVTpBBEbKEzU68t4UHTAkDhRZvVTXNd1pqiqksFPZcEA7 ROrQ== X-Gm-Message-State: AOJu0YyJZQpwyS7IdIyH+R4rgsZ1yynW6X6hgr1xmI+87E8uv0E1iSAc I6yNZk+kXJG9nRRMVF4KmAcZde07LohLs35Ato8y7xKfsVzM6Q/XtoOP79jD7omhISo+sPPrM5o vLUVXH75k4CyFsnUzRQMpqc9A3xXboHY2JNLsCBSSDvJOmNw0IPnGaBEA2Pd9GqruUnonbP8aCd Gq2AMefdF8NzDxKN9gFePMif7xncawyw== X-Google-Smtp-Source: AGHT+IH1WYrW/UKZ6ngnkIpIsR2dgkaJ0zFY0ft3XgXQ0QWdCfqsR4NIFZKbE/zMO6K3p2uoWgwYBDA5 X-Received: from palermo.c.googlers.com ([fda3:e722:ac3:cc00:7b:198d:ac11:8138]) (user=ardb job=sendgmr) by 2002:a05:600c:5709:b0:42c:a879:3d0f with SMTP id 5b1f17b1804b1-42e960af3c0mr226185e9.0.1727276581262; Wed, 25 Sep 2024 08:03:01 -0700 (PDT) Date: Wed, 25 Sep 2024 17:01:28 +0200 In-Reply-To: <20240925150059.3955569-30-ardb+git@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240925150059.3955569-30-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=11373; i=ardb@kernel.org; h=from:subject; bh=vOsRO/wusTOgSIMrTbPQkuvbTEvedgqm5gFKQyyQ6LE=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIe2L6uU7KcXh52pbo2UXaeZq6U587fAt6o/qk6KOindLu xmSJDk6SlkYxDgYZMUUWQRm/3238/REqVrnWbIwc1iZQIYwcHEKwES8vjP8D6r8/Whqj0Ue89/g jLlev1knyS9cOWlNtI5Y6rLiT9GiiYwMF5pPLt85df5ck61Kskef/1wi37sr+6Xjrf+r3xWdTEj U5wUA X-Mailer: git-send-email 2.46.0.792.g87dc391469-goog Message-ID: <20240925150059.3955569-58-ardb+git@google.com> Subject: [RFC PATCH 28/28] x86/tools: Drop x86_64 support from 'relocs' tool From: Ard Biesheuvel To: linux-kernel@vger.kernel.org Cc: Ard Biesheuvel , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Uros Bizjak , Dennis Zhou , Tejun Heo , Christoph Lameter , Mathieu Desnoyers , Paolo Bonzini , Vitaly Kuznetsov , Juergen Gross , Boris Ostrovsky , Greg Kroah-Hartman , Arnd Bergmann , Masahiro Yamada , Kees Cook , Nathan Chancellor , Keith Packard , Justin Stitt , Josh Poimboeuf , Arnaldo Carvalho de Melo , Namhyung Kim , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , linux-doc@vger.kernel.org, linux-pm@vger.kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-efi@vger.kernel.org, linux-arch@vger.kernel.org, linux-sparse@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-perf-users@vger.kernel.org, rust-for-linux@vger.kernel.org, llvm@lists.linux.dev Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ard Biesheuvel The relocs tool is no longer used on vmlinux, which is the only 64-bit ELF executable that it used to operate on in the 64-bit build. (It is still used for parts of the decompressor) So drop the 64-bit handling - it is dead code now. Signed-off-by: Ard Biesheuvel --- arch/x86/tools/Makefile | 2 +- arch/x86/tools/relocs.c | 178 +------------------- arch/x86/tools/relocs.h | 9 +- arch/x86/tools/relocs_64.c | 18 -- arch/x86/tools/relocs_common.c | 11 +- 5 files changed, 9 insertions(+), 209 deletions(-) diff --git a/arch/x86/tools/Makefile b/arch/x86/tools/Makefile index 7278e2545c35..f7d12a9dccfc 100644 --- a/arch/x86/tools/Makefile +++ b/arch/x86/tools/Makefile @@ -40,7 +40,7 @@ $(obj)/insn_sanity.o: $(srctree)/tools/arch/x86/lib/insn.= c $(srctree)/tools/arch =20 HOST_EXTRACFLAGS +=3D -I$(srctree)/tools/include hostprogs +=3D relocs -relocs-objs :=3D relocs_32.o relocs_64.o relocs_common.o +relocs-objs :=3D relocs_32.o relocs_common.o PHONY +=3D relocs relocs: $(obj)/relocs @: diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c index 22c2d3f07a57..ff5578e63ff8 100644 --- a/arch/x86/tools/relocs.c +++ b/arch/x86/tools/relocs.c @@ -28,12 +28,7 @@ struct relocs { static struct relocs relocs16; static struct relocs relocs32; =20 -#if ELF_BITS =3D=3D 64 -static struct relocs relocs64; -# define FMT PRIu64 -#else # define FMT PRIu32 -#endif =20 struct section { Elf_Shdr shdr; @@ -86,10 +81,6 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = =3D { "__end_rodata_aligned|" "__initramfs_start|" "(jiffies|jiffies_64)|" -#if ELF_BITS =3D=3D 64 - "__per_cpu_load|" - "__end_rodata_hpage_align|" -#endif "__vvar_page|" "_end)$" }; @@ -210,27 +201,6 @@ static const char *rel_type(unsigned type) { static const char *type_name[] =3D { #define REL_TYPE(X) [X] =3D #X -#if ELF_BITS =3D=3D 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), - REL_TYPE(R_X86_64_COPY), - REL_TYPE(R_X86_64_GLOB_DAT), - REL_TYPE(R_X86_64_JUMP_SLOT), - REL_TYPE(R_X86_64_RELATIVE), - REL_TYPE(R_X86_64_GOTPCREL), - REL_TYPE(R_X86_64_GOTPCRELX), - REL_TYPE(R_X86_64_REX_GOTPCRELX), - REL_TYPE(R_X86_64_32), - REL_TYPE(R_X86_64_32S), - REL_TYPE(R_X86_64_16), - REL_TYPE(R_X86_64_PC16), - REL_TYPE(R_X86_64_8), - REL_TYPE(R_X86_64_PC8), -#else REL_TYPE(R_386_NONE), REL_TYPE(R_386_32), REL_TYPE(R_386_PC32), @@ -246,7 +216,6 @@ static const char *rel_type(unsigned type) REL_TYPE(R_386_PC8), REL_TYPE(R_386_16), REL_TYPE(R_386_PC16), -#endif #undef REL_TYPE }; const char *name =3D "unknown type rel type name"; @@ -312,19 +281,9 @@ static uint32_t elf32_to_cpu(uint32_t val) #define elf_half_to_cpu(x) elf16_to_cpu(x) #define elf_word_to_cpu(x) elf32_to_cpu(x) =20 -#if ELF_BITS =3D=3D 64 -static uint64_t elf64_to_cpu(uint64_t val) -{ - return le64_to_cpu(val); -} -# define elf_addr_to_cpu(x) elf64_to_cpu(x) -# define elf_off_to_cpu(x) elf64_to_cpu(x) -# define elf_xword_to_cpu(x) elf64_to_cpu(x) -#else # define elf_addr_to_cpu(x) elf32_to_cpu(x) # define elf_off_to_cpu(x) elf32_to_cpu(x) # define elf_xword_to_cpu(x) elf32_to_cpu(x) -#endif =20 static int sym_index(Elf_Sym *sym) { @@ -515,10 +474,7 @@ static void print_absolute_symbols(void) int i; const char *format; =20 - if (ELF_BITS =3D=3D 64) - format =3D "%5d %016"PRIx64" %5"PRId64" %10s %10s %12s %s\n"; - else - format =3D "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n"; + format =3D "%5d %08"PRIx32" %5"PRId32" %10s %10s %12s %s\n"; =20 printf("Absolute symbols\n"); printf(" Num: Value Size Type Bind Visibility Name\n"); @@ -559,10 +515,7 @@ static void print_absolute_relocs(void) int i, printed =3D 0; const char *format; =20 - if (ELF_BITS =3D=3D 64) - format =3D "%016"PRIx64" %016"PRIx64" %10s %016"PRIx64" %s\n"; - else - format =3D "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n"; + format =3D "%08"PRIx32" %08"PRIx32" %10s %08"PRIx32" %s\n"; =20 for (i =3D 0; i < shnum; i++) { struct section *sec =3D &secs[i]; @@ -694,104 +647,6 @@ static void walk_relocs(int (*process)(struct section= *sec, Elf_Rel *rel, } } =20 -#if ELF_BITS =3D=3D 64 - -static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym, - const char *symname) -{ - unsigned r_type =3D ELF64_R_TYPE(rel->r_info); - ElfW(Addr) offset =3D rel->r_offset; - int shn_abs =3D (sym->st_shndx =3D=3D SHN_ABS) && !is_reloc(S_REL, symnam= e); - - if (sym->st_shndx =3D=3D SHN_UNDEF) - return 0; - - switch (r_type) { - case R_X86_64_NONE: - /* NONE can be ignored. */ - break; - - case R_X86_64_PC32: - case R_X86_64_PLT32: - /* - * PC relative relocations don't need to be adjusted. - * - * NB: R_X86_64_PLT32 can be treated as R_X86_64_PC32. - */ - break; - - case R_X86_64_PC64: - /* - * Only used by jump labels - */ - break; - - case R_X86_64_32: - case R_X86_64_32S: - case R_X86_64_64: - case R_X86_64_GOTPCREL: - if (shn_abs) { - /* - * Whitelisted absolute symbols do not require - * relocation. - */ - if (is_reloc(S_ABS, symname)) - break; - - die("Invalid absolute %s relocation: %s\n", rel_type(r_type), symname); - break; - } - - if (r_type =3D=3D R_X86_64_GOTPCREL) { - Elf_Shdr *s =3D &secs[sec->shdr.sh_info].shdr; - unsigned file_off =3D offset - s->sh_addr + s->sh_offset; - - /* - * GOTPCREL relocations refer to instructions that load - * a 64-bit address via a 32-bit relative reference to - * the GOT. In this case, it is the GOT entry that - * needs to be fixed up, not the immediate offset in - * the opcode. Note that the linker will have applied an - * addend of -4 to compensate for the delta between the - * relocation offset and the value of RIP when the - * instruction executes, and this needs to be backed out - * again. (Addends other than -4 are permitted in - * principle, but make no sense in practice so they are - * not supported.) - */ - if (rel->r_addend !=3D -4) { - die("invalid addend (%ld) for %s relocation: %s\n", - rel->r_addend, rel_type(r_type), symname); - break; - } - offset +=3D 4 + (int32_t)get_unaligned_le32(elf_image + file_off); - } - - /* - * Relocation offsets for 64 bit kernels are output - * as 32 bits and sign extended back to 64 bits when - * the relocations are processed. - * Make sure that the offset will fit. - */ - if ((int32_t)offset !=3D (int64_t)offset) - die("Relocation offset doesn't fit in 32 bits\n"); - - if (r_type =3D=3D R_X86_64_64 || r_type =3D=3D R_X86_64_GOTPCREL) - add_reloc(&relocs64, offset); - else - add_reloc(&relocs32, offset); - break; - - default: - die("Unsupported relocation type: %s (%d)\n", rel_type(r_type), r_type); - break; - } - - return 0; -} - -#else - static int do_reloc32(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, const char *symname) { @@ -902,8 +757,6 @@ static int do_reloc_real(struct section *sec, Elf_Rel *= rel, Elf_Sym *sym, const return 0; } =20 -#endif - static int cmp_relocs(const void *va, const void *vb) { const uint32_t *a, *b; @@ -939,17 +792,10 @@ static void emit_relocs(int as_text, int use_real_mod= e) int (*write_reloc)(uint32_t, FILE *) =3D write32; int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym, const ch= ar *symname); =20 -#if ELF_BITS =3D=3D 64 - if (!use_real_mode) - do_reloc =3D do_reloc64; - else - die("--realmode not valid for a 64-bit ELF file"); -#else if (!use_real_mode) do_reloc =3D do_reloc32; else do_reloc =3D do_reloc_real; -#endif =20 /* Collect up the relocations */ walk_relocs(do_reloc); @@ -959,11 +805,7 @@ static void emit_relocs(int as_text, int use_real_mode) =20 /* Order the relocations for more efficient processing */ sort_relocs(&relocs32); -#if ELF_BITS =3D=3D 64 - sort_relocs(&relocs64); -#else sort_relocs(&relocs16); -#endif =20 /* Print the relocations */ if (as_text) { @@ -984,16 +826,6 @@ static void emit_relocs(int as_text, int use_real_mode) for (i =3D 0; i < relocs32.count; i++) write_reloc(relocs32.offset[i], stdout); } else { -#if ELF_BITS =3D=3D 64 - /* Print a stop */ - write_reloc(0, stdout); - - /* Now print each relocation */ - for (i =3D 0; i < relocs64.count; i++) - if (!i || relocs64.offset[i] !=3D relocs64.offset[i - 1]) - write_reloc(relocs64.offset[i], stdout); -#endif - /* Print a stop */ write_reloc(0, stdout); =20 @@ -1027,12 +859,6 @@ static void print_reloc_info(void) walk_relocs(do_reloc_info); } =20 -#if ELF_BITS =3D=3D 64 -# define process process_64 -#else -# define process process_32 -#endif - void process(FILE *fp, int use_real_mode, int as_text, int show_absolute_syms, int show_absolute_relocs, int show_reloc_info) diff --git a/arch/x86/tools/relocs.h b/arch/x86/tools/relocs.h index 7a509604ff92..ef9eec96bd62 100644 --- a/arch/x86/tools/relocs.h +++ b/arch/x86/tools/relocs.h @@ -32,10 +32,7 @@ enum symtype { S_NSYMTYPES }; =20 -void process_32(FILE *fp, int use_real_mode, int as_text, - int show_absolute_syms, int show_absolute_relocs, - int show_reloc_info); -void process_64(FILE *fp, int use_real_mode, int as_text, - int show_absolute_syms, int show_absolute_relocs, - int show_reloc_info); +void process(FILE *fp, int use_real_mode, int as_text, + int show_absolute_syms, int show_absolute_relocs, + int show_reloc_info); #endif /* RELOCS_H */ diff --git a/arch/x86/tools/relocs_64.c b/arch/x86/tools/relocs_64.c deleted file mode 100644 index 9029cb619cb1..000000000000 --- a/arch/x86/tools/relocs_64.c +++ /dev/null @@ -1,18 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include "relocs.h" - -#define ELF_BITS 64 - -#define ELF_MACHINE EM_X86_64 -#define ELF_MACHINE_NAME "x86_64" -#define SHT_REL_TYPE SHT_RELA -#define Elf_Rel Elf64_Rela - -#define ELF_CLASS ELFCLASS64 -#define ELF_R_SYM(val) ELF64_R_SYM(val) -#define ELF_R_TYPE(val) ELF64_R_TYPE(val) -#define ELF_ST_TYPE(o) ELF64_ST_TYPE(o) -#define ELF_ST_BIND(o) ELF64_ST_BIND(o) -#define ELF_ST_VISIBILITY(o) ELF64_ST_VISIBILITY(o) - -#include "relocs.c" diff --git a/arch/x86/tools/relocs_common.c b/arch/x86/tools/relocs_common.c index 6634352a20bc..167985ecd544 100644 --- a/arch/x86/tools/relocs_common.c +++ b/arch/x86/tools/relocs_common.c @@ -72,14 +72,9 @@ int main(int argc, char **argv) die("Cannot read %s: %s", fname, strerror(errno)); } rewind(fp); - if (e_ident[EI_CLASS] =3D=3D ELFCLASS64) - process_64(fp, use_real_mode, as_text, - show_absolute_syms, show_absolute_relocs, - show_reloc_info); - else - process_32(fp, use_real_mode, as_text, - show_absolute_syms, show_absolute_relocs, - show_reloc_info); + process(fp, use_real_mode, as_text, + show_absolute_syms, show_absolute_relocs, + show_reloc_info); fclose(fp); return 0; } --=20 2.46.0.792.g87dc391469-goog