From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dl1-f73.google.com (mail-dl1-f73.google.com [74.125.82.73]) (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 89D863F075C for ; Tue, 2 Jun 2026 15:25:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780413936; cv=none; b=aIBvRKeq+kTMc/Gk1PupM/+bSPPrB54wAR+KjMqohcVGmsCy0tbmpUWnPViMs5QQPfbDdND3wnUP9u5h+JqceuHd4fjhFQaOjChTzmRxkKZpXyRw4p+NL/BXAkWsSWCXB5Y5CWggNgfCPxOP0vGDPl53EgADvRbueTXT7/IpNbo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780413936; c=relaxed/simple; bh=azv2pBu2JzgGiyYsHqFDUXP8g7tfdhTUd7ip2wDqkv4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=I+FY1tmxObQQfBA5M5SVbiuZhCwC21IVIjNe9UZ4XZSXMEBHzQqulUH22BRsiFt60jWwkmrI7Ue9jlDDPPe1uDssqEGlApe46dLXkMUkJTGSsI5cGT+KetEGMDjE8Bbr0Bnyt6/CsJH2IoJHELEY9wlTiGQhhooMlsa+FPQ3W+I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=Me6nXYi9; arc=none smtp.client-ip=74.125.82.73 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--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Me6nXYi9" Received: by mail-dl1-f73.google.com with SMTP id a92af1059eb24-135916eefa0so20324717c88.1 for ; Tue, 02 Jun 2026 08:25:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1780413934; x=1781018734; 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=k0xbxLEfFS6BKwiC2R63DBW2gx2OwZfI2gcRMPfbI9Q=; b=Me6nXYi9Q8TuvAxNoY4/WrfEoq8LhDnuoghXk1Dcu7BGlETsm6CbBJl1uOWxGa91oR N7zuL+2GOIDsdXPW73A6vHusaU7mm1NOpiHoO6TEP9tKee6PKj8jKSb97TPo38N4JtIT SQd8OfUGtrVpBqZkSolyrJUbl7VNbTEd62Nm6vraC2+UwmjBMwhDiNsjZjQV6q5OiBlg Q5inMlLdN+jiegLC7xV54n5dQf9s3b0fnjhqo7PJx8ptublw1V+7ucmYNjyPaiZzRyQv Q91sdz5FBCFZF2nTQRyCbo1BLYg/i7lbwBAGtS1sJ77V7R49f2PaVyhJqq5NHwl4P7AK uZkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780413934; x=1781018734; 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=k0xbxLEfFS6BKwiC2R63DBW2gx2OwZfI2gcRMPfbI9Q=; b=KH5Ryq2eAtlIlVKqNaLbrHFG7rko8TBSa97u1fXq0s8gSd9hfmFThY0+quqUd9ma84 rn5x7uEkxPv9G+oPFzlbKa6Q/jujTKT+NK/1zJiKXGq3g+brRfauAvAQtNDtjSta2RLo veMjVfgz9aPKUSLag1OxLKH0a19rAshr/zGIabIae3C87JzRnX4E5o3mtwej/6jcZQah zncG66ojyE2QsF5t9WYr3Su7WWh0Z+x3sTJaMXm/RobsGdM3rWXUNrgnhi0QmoSd5XMu xt/Kho0iTuCWAZDFvXHs4KHT/f9kSsG8ku2qhhDYI6Znjmbwgt+4Yu85DLERNIKeQUwT mwUQ== X-Forwarded-Encrypted: i=1; AFNElJ+m7DiMOCsy7GjDotTxCvKzNtLHcXjIsLighdg6hGsGKwE9EzLxXrj7gJhZP2a1xhINiwb0u2HK3/spwqI=@vger.kernel.org X-Gm-Message-State: AOJu0Yz+KujcUWD5Wa2tU+32yzGpBKs2RDTMmMnmi3Vrnrem2lTTIKSo U+O5Mtbr5/Bgmk54Xj6/42NBlVuSfiqWwDgg4ioZRbkdTSj8oVQkqhJ6ISlUk/ze1HDliCb598B Dh6xgTN5jFw== X-Received: from dlak23.prod.google.com ([2002:a05:701b:2917:b0:135:e116:73ce]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:45a7:b0:12a:b39a:339f with SMTP id a92af1059eb24-137d413a1eamr6230153c88.21.1780413933329; Tue, 02 Jun 2026 08:25:33 -0700 (PDT) Date: Tue, 2 Jun 2026 08:25:00 -0700 In-Reply-To: <20260602152516.2831152-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260602062452.2583619-1-irogers@google.com> <20260602152516.2831152-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.929.g9b7fa37559-goog Message-ID: <20260602152516.2831152-4-irogers@google.com> Subject: [PATCH v12 03/19] perf env, dso, thread: Add _endian variants for e_machine helpers From: Ian Rogers To: irogers@google.com, acme@kernel.org, namhyung@kernel.org Cc: agordeev@linux.ibm.com, gor@linux.ibm.com, hca@linux.ibm.com, jameshongleiwang@126.com, japo@linux.ibm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-s390@vger.kernel.org, sumanthk@linux.ibm.com, tmricht@linux.ibm.com Content-Type: text/plain; charset="UTF-8" Add perf_arch_is_big_endian(), dso__read_e_machine_endian(), dso__e_machine_endian(), and thread__e_machine_endian() to support bi-endianness and cross-architecture analysis without breaking the existing API. These helpers allow querying the absolute endianness of a DSO or thread, which is required for tools like Capstone that need to set the correct disassembly mode. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- tools/perf/util/dso.c | 19 ++++++++----- tools/perf/util/dso.h | 14 ++++++++-- tools/perf/util/env.c | 16 +++++++++++ tools/perf/util/env.h | 1 + tools/perf/util/thread.c | 58 ++++++++++++++++++++++++++++++---------- tools/perf/util/thread.h | 23 +++++++++++++++- 6 files changed, 108 insertions(+), 23 deletions(-) diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index b791e1b6b2cf..7dced896c64e 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -1220,7 +1220,8 @@ static enum dso_swap_type dso_swap_type__from_elf_data(unsigned char eidata) } /* Reads e_machine from fd, optionally caching data in dso. */ -uint16_t dso__read_e_machine(struct dso *optional_dso, int fd, uint32_t *e_flags) +uint16_t dso__read_e_machine_endian(struct dso *optional_dso, int fd, uint32_t *e_flags, + bool *is_big_endian) { uint16_t e_machine = EM_NONE; unsigned char e_ident[EI_NIDENT]; @@ -1250,6 +1251,9 @@ uint16_t dso__read_e_machine(struct dso *optional_dso, int fd, uint32_t *e_flags if (swap_type == DSO_SWAP__UNSET) return EM_NONE; // Bad ELF data encoding. + if (is_big_endian) + *is_big_endian = (e_ident[EI_DATA] == ELFDATA2MSB); + /* Cache the need for swapping. */ if (optional_dso) { assert(dso__needs_swap(optional_dso) == DSO_SWAP__UNSET || @@ -1288,7 +1292,8 @@ uint16_t dso__read_e_machine(struct dso *optional_dso, int fd, uint32_t *e_flags return e_machine; } -uint16_t dso__e_machine(struct dso *dso, struct machine *machine, uint32_t *e_flags) +uint16_t dso__e_machine_endian(struct dso *dso, struct machine *machine, uint32_t *e_flags, + bool *is_big_endian) { uint16_t e_machine = EM_NONE; int fd; @@ -1308,9 +1313,11 @@ uint16_t dso__e_machine(struct dso *dso, struct machine *machine, uint32_t *e_fl case DSO_BINARY_TYPE__BPF_IMAGE: case DSO_BINARY_TYPE__OOL: case DSO_BINARY_TYPE__JAVA_JIT: - if (e_flags) - *e_flags = EF_HOST; - return EM_HOST; + if (is_big_endian) { + *is_big_endian = perf_arch_is_big_endian( + machine && machine->env ? perf_env__arch(machine->env) : NULL); + } + return perf_env__e_machine(machine ? machine->env : NULL, e_flags); case DSO_BINARY_TYPE__DEBUGLINK: case DSO_BINARY_TYPE__BUILD_ID_CACHE: case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO: @@ -1338,7 +1345,7 @@ uint16_t dso__e_machine(struct dso *dso, struct machine *machine, uint32_t *e_fl try_to_open_dso(dso, machine); fd = dso__data(dso)->fd; if (fd >= 0) - e_machine = dso__read_e_machine(dso, fd, e_flags); + e_machine = dso__read_e_machine_endian(dso, fd, e_flags, is_big_endian); else if (e_flags) *e_flags = 0; diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index ede691e9a249..2916b954a804 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -866,8 +866,18 @@ int dso__data_file_size(struct dso *dso, struct machine *machine); off_t dso__data_size(struct dso *dso, struct machine *machine); ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine, u64 offset, u8 *data, ssize_t size); -uint16_t dso__read_e_machine(struct dso *optional_dso, int fd, uint32_t *e_flags); -uint16_t dso__e_machine(struct dso *dso, struct machine *machine, uint32_t *e_flags); +uint16_t dso__read_e_machine_endian(struct dso *optional_dso, int fd, uint32_t *e_flags, + bool *is_big_endian); +static inline uint16_t dso__read_e_machine(struct dso *optional_dso, int fd, uint32_t *e_flags) +{ + return dso__read_e_machine_endian(optional_dso, fd, e_flags, NULL); +} +uint16_t dso__e_machine_endian(struct dso *dso, struct machine *machine, uint32_t *e_flags, + bool *is_big_endian); +static inline uint16_t dso__e_machine(struct dso *dso, struct machine *machine, uint32_t *e_flags) +{ + return dso__e_machine_endian(dso, machine, e_flags, NULL); +} ssize_t dso__data_read_addr(struct dso *dso, struct map *map, struct machine *machine, u64 addr, u8 *data, ssize_t size); diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 0cd23b5fc651..fae70b07ba8d 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -342,6 +342,22 @@ int perf_env__kernel_is_64_bit(struct perf_env *env) return env->kernel_is_64_bit; } +bool perf_arch_is_big_endian(const char *arch) +{ + if (!arch) + return __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__; + + if (str_ends_with(arch, "_be") || !strcmp(arch, "sparc") || !strcmp(arch, "sparc64") || + !strcmp(arch, "s390") || !strcmp(arch, "s390x") || !strcmp(arch, "powerpc") || + !strcmp(arch, "ppc") || !strcmp(arch, "ppc64") || + !strcmp(arch, "mips") || !strcmp(arch, "mips64") || !strcmp(arch, "parisc") || + !strcmp(arch, "parisc64") || !strcmp(arch, "m68k") || + !strcmp(arch, "armeb") || !strcmp(arch, "mipseb") || !strcmp(arch, "mips64eb")) + return true; + + return false; +} + int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]) { int i; diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h index bde192fd5be5..dd9907dbc345 100644 --- a/tools/perf/util/env.h +++ b/tools/perf/util/env.h @@ -175,6 +175,7 @@ void free_cpu_domain_info(struct cpu_domain_map **cd_map, u32 schedstat_version, void perf_env__exit(struct perf_env *env); int perf_env__kernel_is_64_bit(struct perf_env *env); +bool perf_arch_is_big_endian(const char *arch); int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]); diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index aac9cb75dcf4..ba33c0dfc18f 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -56,6 +56,7 @@ struct thread *thread__new(pid_t pid, pid_t tid) thread__set_cpu(thread, -1); thread__set_guest_cpu(thread, -1); thread__set_e_machine(thread, EM_NONE); + thread__set_e_is_big_endian(thread, false); thread__set_lbr_stitch_enable(thread, false); INIT_LIST_HEAD(thread__namespaces_list(thread)); INIT_LIST_HEAD(thread__comm_list(thread)); @@ -429,7 +430,7 @@ void thread__find_cpumode_addr_location(struct thread *thread, u64 addr, } } -static uint16_t read_proc_e_machine_for_pid(pid_t pid, uint32_t *e_flags) +static uint16_t read_proc_e_machine_for_pid(pid_t pid, uint32_t *e_flags, bool *is_big_endian) { char path[6 /* "/proc/" */ + 11 /* max length of pid */ + 5 /* "/exe\0" */]; int fd; @@ -438,7 +439,8 @@ static uint16_t read_proc_e_machine_for_pid(pid_t pid, uint32_t *e_flags) snprintf(path, sizeof(path), "/proc/%d/exe", pid); fd = open(path, O_RDONLY); if (fd >= 0) { - e_machine = dso__read_e_machine(/*optional_dso=*/NULL, fd, e_flags); + e_machine = dso__read_e_machine_endian(/*optional_dso=*/NULL, fd, e_flags, + is_big_endian); close(fd); } return e_machine; @@ -448,6 +450,7 @@ struct thread__e_machine_callback_args { struct machine *machine; uint32_t e_flags; uint16_t e_machine; + bool is_big_endian; }; static int thread__e_machine_callback(struct map *map, void *_args) @@ -458,24 +461,38 @@ static int thread__e_machine_callback(struct map *map, void *_args) if (!dso) return 0; // No dso, continue search. - args->e_machine = dso__e_machine(dso, args->machine, &args->e_flags); + args->e_machine = + dso__e_machine_endian(dso, args->machine, &args->e_flags, &args->is_big_endian); return args->e_machine != EM_NONE ? 1 /* stop search */ : 0 /* continue search */; } -uint16_t thread__e_machine(struct thread *thread, struct machine *machine, uint32_t *e_flags) +uint16_t thread__e_machine_endian(struct thread *thread, struct machine *machine, uint32_t *e_flags, + bool *is_big_endian) { pid_t tid, pid; - uint16_t e_machine = RC_CHK_ACCESS(thread)->e_machine; + uint16_t e_machine; uint32_t local_e_flags = 0; - struct thread__e_machine_callback_args args = { - .machine = machine, - .e_flags = 0, - .e_machine = EM_NONE, - }; + struct thread__e_machine_callback_args args; + + if (!thread) { + if (is_big_endian) { + *is_big_endian = perf_arch_is_big_endian( + machine && machine->env ? perf_env__arch(machine->env) : NULL); + } + return perf_env__e_machine(machine ? machine->env : NULL, e_flags); + } + + e_machine = RC_CHK_ACCESS(thread)->e_machine; + args.machine = machine; + args.e_flags = 0; + args.e_machine = EM_NONE; + args.is_big_endian = false; if (e_machine != EM_NONE) { if (e_flags) *e_flags = thread__e_flags(thread); + if (is_big_endian) + *is_big_endian = thread__e_is_big_endian(thread); return e_machine; } @@ -483,6 +500,7 @@ uint16_t thread__e_machine(struct thread *thread, struct machine *machine, uint3 struct maps *maps = thread__maps(thread); machine = maps__machine(maps); + args.machine = machine; } tid = thread__tid(thread); pid = thread__pid(thread); @@ -490,7 +508,8 @@ uint16_t thread__e_machine(struct thread *thread, struct machine *machine, uint3 struct thread *parent = machine__findnew_thread(machine, pid, pid); if (parent) { - e_machine = thread__e_machine(parent, machine, &local_e_flags); + e_machine = thread__e_machine_endian(parent, machine, &local_e_flags, + &args.is_big_endian); thread__put(parent); goto out; } @@ -515,16 +534,27 @@ uint16_t thread__e_machine(struct thread *thread, struct machine *machine, uint3 is_live = !!session->data; } /* Read from /proc/pid/exe if live. */ - if (is_live) - e_machine = read_proc_e_machine_for_pid(pid, &local_e_flags); + if (is_live) { + e_machine = read_proc_e_machine_for_pid(pid, &local_e_flags, + &args.is_big_endian); + } else if (machine && machine->env) { + /* Offline analysis: fallback to environment metadata. */ + e_machine = perf_env__e_machine(machine->env, &local_e_flags); + args.is_big_endian = perf_arch_is_big_endian(perf_env__arch(machine->env)); + } } out: if (e_machine != EM_NONE) { - thread__set_e_machine(thread, e_machine); thread__set_e_flags(thread, local_e_flags); + thread__set_e_is_big_endian(thread, args.is_big_endian); + thread__set_e_machine(thread, e_machine); + if (is_big_endian) + *is_big_endian = args.is_big_endian; } else { e_machine = EM_HOST; local_e_flags = EF_HOST; + if (is_big_endian) + *is_big_endian = (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__); } if (e_flags) *e_flags = local_e_flags; diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h index f5792d3e8a16..d82fce8173ae 100644 --- a/tools/perf/util/thread.h +++ b/tools/perf/util/thread.h @@ -69,6 +69,11 @@ DECLARE_RC_STRUCT(thread) { * computed. */ uint16_t e_machine; + /** + * @e_is_big_endian: True if the ELF architecture of the thread is big endian. + * Valid if e_machine != EM_NONE. + */ + bool e_is_big_endian; /* LBR call stack stitch */ bool lbr_stitch_enable; struct lbr_stitch *lbr_stitch; @@ -311,7 +316,13 @@ static inline void thread__set_filter_entry_depth(struct thread *thread, int dep RC_CHK_ACCESS(thread)->filter_entry_depth = depth; } -uint16_t thread__e_machine(struct thread *thread, struct machine *machine, uint32_t *e_flags); +uint16_t thread__e_machine_endian(struct thread *thread, struct machine *machine, uint32_t *e_flags, + bool *is_big_endian); +static inline uint16_t thread__e_machine(struct thread *thread, struct machine *machine, + uint32_t *e_flags) +{ + return thread__e_machine_endian(thread, machine, e_flags, NULL); +} static inline void thread__set_e_machine(struct thread *thread, uint16_t e_machine) { @@ -328,6 +339,16 @@ static inline void thread__set_e_flags(struct thread *thread, uint32_t e_flags) RC_CHK_ACCESS(thread)->e_flags = e_flags; } +static inline bool thread__e_is_big_endian(const struct thread *thread) +{ + return RC_CHK_ACCESS(thread)->e_is_big_endian; +} + +static inline void thread__set_e_is_big_endian(struct thread *thread, bool is_big_endian) +{ + RC_CHK_ACCESS(thread)->e_is_big_endian = is_big_endian; +} + static inline bool thread__lbr_stitch_enable(const struct thread *thread) { -- 2.54.0.929.g9b7fa37559-goog