From nobody Fri Dec 19 08:06:21 2025 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 4576F226188 for ; Thu, 17 Apr 2025 23:08:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744931296; cv=none; b=g30Dg3zY31bE5DuZHMmwxH4KGK4aWuO6JW2ik25w99qLplwj2Q99RggP4M39MORJzZMAo3j1AECgDbHb/A59NXMNPkenO+8DgJzDwVAp7NlVEmloEg0orqiGg5DyLICnNy6YVw+OvhOrwb9wr7O0tseut0WiVll9vTY3KQWZ1nA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744931296; c=relaxed/simple; bh=Dop39pNTWiPxwnxSmZLSOwLih9pfECvq0vx0SaSe0F0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=i/qPKVgp1ZjSGsbIi+MzAC8OHycVp349sbIiLVLoT6P/tFdl8c4QraAwkVgrAVgqNrxbcgwzBnkvvs3FekgUE94KSC+Et7KafS+1wJfWjZBZmQ1cEfugGoU78rC5DdbDUwloKLiysoxYcLveB9pQgikcrjyv67/4iP4xQdRnooA= 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=o/EreJLY; arc=none smtp.client-ip=209.85.214.202 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="o/EreJLY" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-2241e7e3addso12544735ad.1 for ; Thu, 17 Apr 2025 16:08:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1744931294; x=1745536094; darn=vger.kernel.org; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=CGY+E3gxE4zS5dXOjOobKOoTErjVF4eK9OtL9zfg1Kg=; b=o/EreJLYw4Q5ZKsa5TIYtnm3C/d2E2/j1A4alFIs0ltNOq1DKF4GjcyEax/+07LLLO XHf4zCUCbC59fMs8hAUWvWR7PKVEj6HSCVUVRusCRPh7FPg8ssvnnl0qAanPI4tFIopt x95QJ8xQ2f/Lldvu4snC6xLvvDb7x3YTuJ8jY1eOb1eb351Uv9To/I+66/z2uQu2CPjP uJHq8oPhePo9ciphmcsdeUAyLWpscuKsPrLTR2BwgG9eAwROhTh71GZl39wiujRYpOUy R7xnJV5T/0VV5fHIyynlAuShqDGNUDg3ulaopkmg68PntbInN55L7l/oSJYAh5pthYDd cAnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744931294; x=1745536094; h=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=CGY+E3gxE4zS5dXOjOobKOoTErjVF4eK9OtL9zfg1Kg=; b=tsMK+Rrwojkbx7MPQpERYGvt5AqtMLBMteNT0LhK1noRyOfV4atrfk/iX/6MppCvTU SXBR7+MuAr018J2XLEM1FcOKH+U6KkMerdESJ4fL7AlvuPghj/bGMqSVK2wfogcJsG33 l+vFq6hQ77APYWXcKH2vw+5FkRpi7oj4xdE88gnKMhx7kh2cSbbSQ7i81A3N0NIeCHBm KzI8hgrk63aWfv2M0hrDhHcBhoMWfsdGfq1cMabT+TY/5bQVf+J94oHTJurmoMfZjP7h l8RPppId5MhEg3G5FHwDpMlL0XX69U1qMe+EIuapPeQk+rCU/xYqSp330d4Fbxz4/PJP HA8Q== X-Forwarded-Encrypted: i=1; AJvYcCXrQ/5ZJwL1TAQfVxuBq/h1xWqxxZT+ljJyTsQoJJLVlSRXRpIa4ENwbQiNQdL9BfGYiAZD5+FdLUHaD1M=@vger.kernel.org X-Gm-Message-State: AOJu0Yxo+RykWBSty7afF8gaDyZaQclWxhx4paekQNXA7TK8q+ZreJ+0 DWWrq/w+vOHrCLtBjM4uPp0uL7P8A78lMJvxSFSbXX9QCZiaBBwvaPAS3lbtW8K2F3UrKL3ftFk B0oyxEg== X-Google-Smtp-Source: AGHT+IFulWl/JXP/uDZuGK+zA95FAU0s8izVzXe26Ii6nCX+oaQOaC629ZxyNDj9U+sVXbgW1pM08jdMi8r5 X-Received: from plo21.prod.google.com ([2002:a17:902:ee55:b0:221:8568:bfe3]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:ec90:b0:229:1717:8826 with SMTP id d9443c01a7336-22c535b4a1cmr10834225ad.28.1744931293301; Thu, 17 Apr 2025 16:08:13 -0700 (PDT) Date: Thu, 17 Apr 2025 16:07:30 -0700 In-Reply-To: <20250417230740.86048-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250417230740.86048-1-irogers@google.com> X-Mailer: git-send-email 2.49.0.805.g082f7c87e0-goog Message-ID: <20250417230740.86048-10-irogers@google.com> Subject: [PATCH v4 09/19] perf dso: Move read_symbol from llvm/capstone to dso From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Aditya Gupta , "Steinar H. Gunderson" , Charlie Jenkins , Changbin Du , "Masami Hiramatsu (Google)" , James Clark , Kajol Jain , Athira Rajeev , Li Huafei , Dmitry Vyukov , Andi Kleen , Chaitanya S Prakash , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, llvm@lists.linux.dev, Song Liu , bpf@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Move the read_symbol function to dso.h, make the return type const and add a mutable out_buf out parameter. In future changes this will allow a code pointer to be returned without necessary allocating memory. Signed-off-by: Ian Rogers --- tools/perf/util/capstone.c | 64 +++++----------------------- tools/perf/util/dso.c | 67 +++++++++++++++++++++++++++++ tools/perf/util/dso.h | 4 ++ tools/perf/util/llvm.c | 87 +++++++------------------------------- 4 files changed, 97 insertions(+), 125 deletions(-) diff --git a/tools/perf/util/capstone.c b/tools/perf/util/capstone.c index 8d65c7a55a8b..f103988184c8 100644 --- a/tools/perf/util/capstone.c +++ b/tools/perf/util/capstone.c @@ -434,66 +434,23 @@ static int find_file_offset(u64 start, u64 len, u64 p= goff, void *arg) return 0; } =20 -static u8 * -read_symbol(const char *filename, struct map *map, struct symbol *sym, - u64 *len, bool *is_64bit) -{ - struct dso *dso =3D map__dso(map); - struct nscookie nsc; - u64 start =3D map__rip_2objdump(map, sym->start); - u64 end =3D map__rip_2objdump(map, sym->end); - int fd, count; - u8 *buf =3D NULL; - struct find_file_offset_data data =3D { - .ip =3D start, - }; - - *is_64bit =3D false; - - nsinfo__mountns_enter(dso__nsinfo(dso), &nsc); - fd =3D open(filename, O_RDONLY); - nsinfo__mountns_exit(&nsc); - if (fd < 0) - return NULL; - - if (file__read_maps(fd, /*exe=3D*/true, find_file_offset, &data, - is_64bit) =3D=3D 0) - goto err; - - *len =3D end - start; - buf =3D malloc(*len); - if (buf =3D=3D NULL) - goto err; - - count =3D pread(fd, buf, *len, data.offset); - close(fd); - fd =3D -1; - - if ((u64)count !=3D *len) - goto err; - - return buf; - -err: - if (fd >=3D 0) - close(fd); - free(buf); - return NULL; -} - int symbol__disassemble_capstone(const char *filename __maybe_unused, struct symbol *sym __maybe_unused, struct annotate_args *args __maybe_unused) { struct annotation *notes =3D symbol__annotation(sym); struct map *map =3D args->ms.map; + struct dso *dso =3D map__dso(map); u64 start =3D map__rip_2objdump(map, sym->start); - u64 len; u64 offset; int i, count, free_count; bool is_64bit =3D false; bool needs_cs_close =3D false; - u8 *buf =3D NULL; + /* Malloc-ed buffer containing instructions read from disk. */ + u8 *code_buf =3D NULL; + /* Pointer to code to be disassembled. */ + const u8 *buf; + u64 buf_len; csh handle; struct cs_insn *insn =3D NULL; char disasm_buf[512]; @@ -503,7 +460,8 @@ int symbol__disassemble_capstone(const char *filename _= _maybe_unused, if (args->options->objdump_path) return -1; =20 - buf =3D read_symbol(filename, map, sym, &len, &is_64bit); + buf =3D dso__read_symbol(dso, filename, map, sym, + &code_buf, &buf_len, &is_64bit); if (buf =3D=3D NULL) return -1; =20 @@ -532,7 +490,7 @@ int symbol__disassemble_capstone(const char *filename _= _maybe_unused, =20 needs_cs_close =3D true; =20 - free_count =3D count =3D perf_cs_disasm(handle, buf, len, start, len, &in= sn); + free_count =3D count =3D perf_cs_disasm(handle, buf, buf_len, start, buf_= len, &insn); for (i =3D 0, offset =3D 0; i < count; i++) { int printed; =20 @@ -556,7 +514,7 @@ int symbol__disassemble_capstone(const char *filename _= _maybe_unused, } =20 /* It failed in the middle: probably due to unknown instructions */ - if (offset !=3D len) { + if (offset !=3D buf_len) { struct list_head *list =3D ¬es->src->source; =20 /* Discard all lines and fallback to objdump */ @@ -575,7 +533,7 @@ int symbol__disassemble_capstone(const char *filename _= _maybe_unused, if (free_count > 0) perf_cs_free(insn, free_count); } - free(buf); + free(code_buf); return count < 0 ? count : 0; =20 err: diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index 8619b6eea62d..9b1e3fb3b2b9 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -1776,3 +1776,70 @@ bool is_perf_pid_map_name(const char *dso_name) =20 return perf_pid_map_tid(dso_name, &tid); } + +struct find_file_offset_data { + u64 ip; + u64 offset; +}; + +/* This will be called for each PHDR in an ELF binary */ +static int find_file_offset(u64 start, u64 len, u64 pgoff, void *arg) +{ + struct find_file_offset_data *data =3D arg; + + if (start <=3D data->ip && data->ip < start + len) { + data->offset =3D pgoff + data->ip - start; + return 1; + } + return 0; +} + +const u8 *dso__read_symbol(struct dso *dso, const char *symfs_filename, + const struct map *map, const struct symbol *sym, + u8 **out_buf, u64 *out_buf_len, bool *is_64bit) +{ + struct nscookie nsc; + u64 start =3D map__rip_2objdump(map, sym->start); + u64 end =3D map__rip_2objdump(map, sym->end); + int fd, count; + u8 *buf =3D NULL; + size_t len; + struct find_file_offset_data data =3D { + .ip =3D start, + }; + + *out_buf =3D NULL; + *out_buf_len =3D 0; + *is_64bit =3D false; + + nsinfo__mountns_enter(dso__nsinfo(dso), &nsc); + fd =3D open(symfs_filename, O_RDONLY); + nsinfo__mountns_exit(&nsc); + if (fd < 0) + return NULL; + + if (file__read_maps(fd, /*exe=3D*/true, find_file_offset, &data, is_64bit= ) =3D=3D 0) + goto err; + + len =3D end - start; + buf =3D malloc(len); + if (buf =3D=3D NULL) + goto err; + + count =3D pread(fd, buf, len, data.offset); + close(fd); + fd =3D -1; + + if ((u64)count !=3D len) + goto err; + + *out_buf =3D buf; + *out_buf_len =3D len; + return buf; + +err: + if (fd >=3D 0) + close(fd); + free(buf); + return NULL; +} diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index c87564471f9b..6230eea7a93a 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -896,4 +896,8 @@ u64 dso__findnew_global_type(struct dso *dso, u64 addr,= u64 offset); bool perf_pid_map_tid(const char *dso_name, int *tid); bool is_perf_pid_map_name(const char *dso_name); =20 +const u8 *dso__read_symbol(struct dso *dso, const char *symfs_filename, + const struct map *map, const struct symbol *sym, + u8 **out_buf, u64 *out_buf_len, bool *is_64bit); + #endif /* __PERF_DSO */ diff --git a/tools/perf/util/llvm.c b/tools/perf/util/llvm.c index f6a8943b7c9d..a0774373f0d6 100644 --- a/tools/perf/util/llvm.c +++ b/tools/perf/util/llvm.c @@ -296,71 +296,6 @@ void dso__free_a2l_llvm(struct dso *dso __maybe_unused) /* Nothing to free. */ } =20 - -struct find_file_offset_data { - u64 ip; - u64 offset; -}; - -/* This will be called for each PHDR in an ELF binary */ -static int find_file_offset(u64 start, u64 len, u64 pgoff, void *arg) -{ - struct find_file_offset_data *data =3D arg; - - if (start <=3D data->ip && data->ip < start + len) { - data->offset =3D pgoff + data->ip - start; - return 1; - } - return 0; -} - -static u8 * -read_symbol(const char *filename, struct map *map, struct symbol *sym, - u64 *len, bool *is_64bit) -{ - struct dso *dso =3D map__dso(map); - struct nscookie nsc; - u64 start =3D map__rip_2objdump(map, sym->start); - u64 end =3D map__rip_2objdump(map, sym->end); - int fd, count; - u8 *buf =3D NULL; - struct find_file_offset_data data =3D { - .ip =3D start, - }; - - *is_64bit =3D false; - - nsinfo__mountns_enter(dso__nsinfo(dso), &nsc); - fd =3D open(filename, O_RDONLY); - nsinfo__mountns_exit(&nsc); - if (fd < 0) - return NULL; - - if (file__read_maps(fd, /*exe=3D*/true, find_file_offset, &data, - is_64bit) =3D=3D 0) - goto err; - - *len =3D end - start; - buf =3D malloc(*len); - if (buf =3D=3D NULL) - goto err; - - count =3D pread(fd, buf, *len, data.offset); - close(fd); - fd =3D -1; - - if ((u64)count !=3D *len) - goto err; - - return buf; - -err: - if (fd >=3D 0) - close(fd); - free(buf); - return NULL; -} - /* * Whenever LLVM wants to resolve an address into a symbol, it calls this * callback. We don't ever actually _return_ anything (in particular, beca= use @@ -397,8 +332,11 @@ int symbol__disassemble_llvm(const char *filename, str= uct symbol *sym, struct map *map =3D args->ms.map; struct dso *dso =3D map__dso(map); u64 start =3D map__rip_2objdump(map, sym->start); - u8 *buf; - u64 len; + /* Malloc-ed buffer containing instructions read from disk. */ + u8 *code_buf =3D NULL; + /* Pointer to code to be disassembled. */ + const u8 *buf; + u64 buf_len; u64 pc; bool is_64bit; char triplet[64]; @@ -418,7 +356,8 @@ int symbol__disassemble_llvm(const char *filename, stru= ct symbol *sym, perf_LLVMInitializeAllTargetMCs(); perf_LLVMInitializeAllDisassemblers(); =20 - buf =3D read_symbol(filename, map, sym, &len, &is_64bit); + buf =3D dso__read_symbol(dso, filename, map, sym, + &code_buf, &buf_len, &is_64bit); if (buf =3D=3D NULL) return -1; =20 @@ -466,14 +405,18 @@ int symbol__disassemble_llvm(const char *filename, st= ruct symbol *sym, annotation_line__add(&dl->al, ¬es->src->source); =20 pc =3D start; - for (u64 offset =3D 0; offset < len; ) { + for (u64 offset =3D 0; offset < buf_len; ) { unsigned int ins_len; =20 storage.branch_addr =3D 0; storage.pcrel_load_addr =3D 0; =20 - ins_len =3D perf_LLVMDisasmInstruction(disasm, buf + offset, - len - offset, pc, + /* + * LLVM's API has the code be disassembled as non-const, cast + * here as we may be disassembling from mapped read-only memory. + */ + ins_len =3D perf_LLVMDisasmInstruction(disasm, (u8 *)(buf + offset), + buf_len - offset, pc, disasm_buf, sizeof(disasm_buf)); if (ins_len =3D=3D 0) goto err; @@ -531,7 +474,7 @@ int symbol__disassemble_llvm(const char *filename, stru= ct symbol *sym, =20 err: perf_LLVMDisasmDispose(disasm); - free(buf); + free(code_buf); free(line_storage); return ret; } --=20 2.49.0.805.g082f7c87e0-goog