From nobody Sat Feb 7 18:58:52 2026 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (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 C2CFB1BEF7A for ; Wed, 22 Jan 2025 06:25:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737527105; cv=none; b=jQ0c7kEk2ZRWOJeeUgBKTYoK0CYz53DKwvou3GiGBAibQqRycQHHetFuMerkQyr+Pb6Pxv5S4jSacOZ+Y+JXn43fzR7QBfYhK/fL0uTyOp5wyof3O6LkI0yqNeHsGKT26RfLEeuZ5+/zKxecsf+cld6uQqEaRacNtJN23wb/Xg4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737527105; c=relaxed/simple; bh=HyF8MzGPJg1E6Do/DMTf+qbt3SxXfZbYtVitHb/HJLs=; h=Date:In-Reply-To:Message-Id:Mime-Version:References:Subject:From: To:Content-Type; b=CGMFd9p/HAoLZJ+wI9TRKav68j04MwTL3AwL6zYJ951RM/vwQrtSoBFEtw4Iw+dFl0RI6T9lbOPfcZM72fbGTauxAR94z3A0rlg4peSMfXTs5mY/POsBagZZuimSjiB4jjYrL7T3KIjKtkYZsdBnhm8DD6d1rYI2re6YhehQ9sU= 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=BIbZOfM0; arc=none smtp.client-ip=209.85.219.202 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="BIbZOfM0" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-e48beea5778so16022159276.1 for ; Tue, 21 Jan 2025 22:25:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1737527103; x=1738131903; darn=vger.kernel.org; h=to:from:subject:references:mime-version:message-id:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=OgrvkZ657QImwi6lc3WsCCSLkVlVfHzjlVLn1y8own8=; b=BIbZOfM0oZMDcjTw8dHudjz/5IdMC7Adzc9/sPMbzypg962eT86wQLKnvrFkEzzXSW GUKDm7eVSJs2RILH5L2crREwT7U5DBjBygTMH1Tna+3YYR/vqaTc627r4/ldLWmFC2Up pZIUc+MOYrvcinziNMrwgunBbA4fkRvDzVqdQ3tYMo1/6LW0wH/h5MTASePiWtHNyuX5 hNiig0ajiffFW8pKIpkZXdRZPkEvutmbZWOaKVLvwAjrwRndrhIs5VKcn6RyXZZvBEqU PZBkjXt6G2b47Wo91OTAsLvGjd7YhnZcbrqo48YNFHX7cf5L8WkBCi9mxjQ7CplEiwuh xveQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737527103; x=1738131903; h=to:from:subject:references:mime-version:message-id:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=OgrvkZ657QImwi6lc3WsCCSLkVlVfHzjlVLn1y8own8=; b=f+tOgYsU+0WwC1CINQHzBqVn8G5ygeThNJzBMEqWMyHHVwLWEMmcXv2xwY0bPvfOkK nHG79XHicQvVw1I9xbUTNDl2GP/wpndrczttajVLgXpl1eFvKa4OR9ExEL5GbPNRQDA7 c83s7hgaIifSdep6fiwUqKXhxVsz+OGspI6wwCTYRykIoGYpu6TEo2FDxFGFtLVj0bYg 5JMJZs2TCsOMTYGefvIr+P+tLmZSgNsEI6zEmiSeEdWB1HD4sb5+Pxi0oOl3oZqq1TLr aC8tBvGtTJTz7wyu/d94bfNK+pxg0BFosA+i6SY5bPULJDwuEIMtdXXQ2nvB9OjdqB7y CLkA== X-Forwarded-Encrypted: i=1; AJvYcCUfeKnigmsAc2yIcpbWrMuUXTRCo3xQhpJN/SfnusjtPGKVpz6sPt+nGNKwxnWK6XWRrhMvc0dTbfsw+Lw=@vger.kernel.org X-Gm-Message-State: AOJu0YxhILlDkqjZYajV9/Wj6/cZhqaJ22VPbEQVT6PH+blmoJD9EgNK 2UbvJWRR+59Ao8tVKFSPT6JQEiToK6pvqE9CnZehtWbbpQ6a9s4rHyxh1YziM/BkR/Mb1wxFlT4 P4rrEpA== X-Google-Smtp-Source: AGHT+IFEOrfiAwnNwnDSaAeF9iqef1fiQ/E6IuDI5dItzM8nXl59fKPhAOg42XIax1O7ETkSWKQsfIZHvj1T X-Received: from irogers.svl.corp.google.com ([2620:15c:2c5:11:807b:be79:d5c3:ee5c]) (user=irogers job=sendgmr) by 2002:a05:690c:5204:b0:6ef:c86b:af48 with SMTP id 00721157ae682-6f6eb649e8dmr258027b3.2.1737527102737; Tue, 21 Jan 2025 22:25:02 -0800 (PST) Date: Tue, 21 Jan 2025 22:23:24 -0800 In-Reply-To: <20250122062332.577009-1-irogers@google.com> Message-Id: <20250122062332.577009-10-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250122062332.577009-1-irogers@google.com> X-Mailer: git-send-email 2.48.0.rc2.279.g1de40edade-goog Subject: [PATCH v2 09/17] 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 5c6e85fdae0d..0285904ed26d 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -1664,3 +1664,70 @@ 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 bb8e8f444054..734e3a3d95f0 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -828,4 +828,8 @@ 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 2.48.0.rc2.279.g1de40edade-goog