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AJvYcCVSvQJBZ3nkDqjWi7jfylpftF8VgW5FP6fT+53FyHUGqQQ7pqBpPA9UZgDOJsxIPPOU98BpyBBv49hqppEUeNYGEGmEjya7dOSvzqOD X-Gm-Message-State: AOJu0YyKqPmAWq3s6ztVYGMPdHIQDrWvnXAkGCZhTmeajOWi0pGT02y3 S9YjsptRXlx9V0qLxJ5mMEfDrUq3Zdkcai/gRYL4HRLvKNrIUBiiAMmEcWbS4WRCH3SbvcaB0or /fgADbi152iiklr5Qhqb/775Vaw== X-Google-Smtp-Source: AGHT+IHsjSrwOS0Wj6w6liPWf1kv/uqSpoF2WSPbUclGM+sXDYGYNn9as+p2jf2d8vSq09tsOBsmTenxf4MfLYAt/8U= X-Received: from samitolvanen.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:4f92]) (user=samitolvanen job=sendgmr) by 2002:a17:902:f601:b0:1f7:3e75:20cf with SMTP id d9443c01a7336-1f8627f9149mr763355ad.8.1718647109252; Mon, 17 Jun 2024 10:58:29 -0700 (PDT) Date: Mon, 17 Jun 2024 17:58:21 +0000 In-Reply-To: <20240617175818.58219-17-samitolvanen@google.com> Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240617175818.58219-17-samitolvanen@google.com> X-Developer-Key: i=samitolvanen@google.com; a=openpgp; fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=8432; i=samitolvanen@google.com; h=from:subject; bh=xEYsXEZcuwwhUBMDlUBf1X1yPVPLH2iuty1W6//7LKE=; b=owEB7QES/pANAwAKAUy19oSLvFbuAcsmYgBmcHk6sng5HUOoC/7PBTpSTIHLFp+zaKAkdN/PD 3Pay0BzSciJAbMEAAEKAB0WIQQ1zPtjsoPW0663g5RMtfaEi7xW7gUCZnB5OgAKCRBMtfaEi7xW 7koJDACqAdbqz0N0fPaklN5axIJo9/W9Atwvp0ZtvnO5B+8ZSkl8hLF9tJF8YaTMbGIPAIgULmX tXuCuZhhOFCsrwYfYWyNzpV0RZtSqSckWGdcfLG/4+Q0rJMsoWiyorxsh8X54Ehb7ZFqDHT7o1G CV6edtc+Rei2jiOR5ABAcdA7yHSl+folJT//qII8uXNRbiJHhOcf7a0is7s/xm9lHmpwvyFTVlI KF7FJHEEDEG/YI8ahPtKcio1JOkDCT+ND0/9dJC63lqVS+tfIbXYnojkFXheNpIQrbWEs+2O94Z rntIqvvWvAL72TXg/Ql6xxP7MCzhBK9F5Z7SrnO+Udd1gWnlf0EEoSLlpSg+E30RZfZFA5Rhvqa KvzYrtFSDuHSa3RtyyoHxyiM0lvLH3Al8UfmyEi16bs/ZYzXLXJEFhuKmlGLn2iLYHDXwBO0vEY NjpQWUn8TPfGSaB+VuU/0jJ5acQASB7dzw692q9U+bcth9TAnJNazvVU5+QQOWcZPJK2k= X-Mailer: git-send-email 2.45.2.627.g7a2c4fd464-goog Message-ID: <20240617175818.58219-19-samitolvanen@google.com> Subject: [PATCH 02/15] gendwarfksyms: Add symbol list input handling From: Sami Tolvanen To: Masahiro Yamada , Luis Chamberlain , Miguel Ojeda , Greg Kroah-Hartman Cc: Matthew Maurer , Alex Gaynor , Wedson Almeida Filho , Gary Guo , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, rust-for-linux@vger.kernel.org, Sami Tolvanen Support passing a list of exported symbols to gendwarfksyms via stdin and filter non-exported symbols from the output. The symbol list input has the format 'symbol-address symbol-name' to allow the parser to discover exported symbols also by address. This is necessary for aliased symbols, where only one name appears in the debugging information. Signed-off-by: Sami Tolvanen --- tools/gendwarfksyms/Build | 1 + tools/gendwarfksyms/gendwarfksyms.c | 2 + tools/gendwarfksyms/gendwarfksyms.h | 17 ++++ tools/gendwarfksyms/symbols.c | 130 ++++++++++++++++++++++++++++ tools/gendwarfksyms/types.c | 70 ++++++++++++++- 5 files changed, 219 insertions(+), 1 deletion(-) create mode 100644 tools/gendwarfksyms/symbols.c diff --git a/tools/gendwarfksyms/Build b/tools/gendwarfksyms/Build index 805591b6df80..a83c59bfef8b 100644 --- a/tools/gendwarfksyms/Build +++ b/tools/gendwarfksyms/Build @@ -1,2 +1,3 @@ gendwarfksyms-y += gendwarfksyms.o +gendwarfksyms-y += symbols.o gendwarfksyms-y += types.o diff --git a/tools/gendwarfksyms/gendwarfksyms.c b/tools/gendwarfksyms/gendwarfksyms.c index 4a2dea307849..4a1bd9239182 100644 --- a/tools/gendwarfksyms/gendwarfksyms.c +++ b/tools/gendwarfksyms/gendwarfksyms.c @@ -96,6 +96,8 @@ int main(int argc, const char **argv) if (parse_options(argc, argv, &filename) < 0) return usage(); + check(symbol_read_list(stdin)); + fd = open(filename, O_RDONLY); if (fd == -1) { error("open failed for '%s': %s", filename, strerror(errno)); diff --git a/tools/gendwarfksyms/gendwarfksyms.h b/tools/gendwarfksyms/gendwarfksyms.h index 44e94f1d9671..b77855cc94a7 100644 --- a/tools/gendwarfksyms/gendwarfksyms.h +++ b/tools/gendwarfksyms/gendwarfksyms.h @@ -49,6 +49,21 @@ extern bool debug; __res; \ }) +/* + * symbols.c + */ + +/* Exported symbol -- matching either the name or the address */ +struct symbol { + const char *name; + uintptr_t addr; + struct hlist_node addr_hash; + struct hlist_node name_hash; +}; + +extern int symbol_read_list(FILE *file); +extern struct symbol *symbol_get(uintptr_t addr, const char *name); + /* * types.c */ @@ -56,6 +71,8 @@ extern bool debug; struct state { Dwfl_Module *mod; Dwarf *dbg; + struct symbol *sym; + Dwarf_Die origin; }; typedef int (*die_callback_t)(struct state *state, Dwarf_Die *die); diff --git a/tools/gendwarfksyms/symbols.c b/tools/gendwarfksyms/symbols.c new file mode 100644 index 000000000000..2cae61bcede7 --- /dev/null +++ b/tools/gendwarfksyms/symbols.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2024 Google LLC + */ + +#include +#include +#include "gendwarfksyms.h" + +/* Hash tables for looking up requested symbols by address and name */ +#define SYMBOL_HASH_BITS 7 +DEFINE_HASHTABLE(symbol_addrs, SYMBOL_HASH_BITS); +DEFINE_HASHTABLE(symbol_names, SYMBOL_HASH_BITS); + +static u32 name_hash(const char *name) +{ + return jhash(name, strlen(name), 0); +} + +/* symbol_for_each callback -- return true to stop, false to continue */ +typedef bool (*symbol_callback_t)(struct symbol *, void *arg); + +static bool for_each_addr(uintptr_t addr, symbol_callback_t func, void *data) +{ + struct symbol *sym; + bool found = false; + + if (addr == UINTPTR_MAX) + return false; + + hash_for_each_possible(symbol_addrs, sym, addr_hash, addr) { + if (sym->addr == addr) { + if (func(sym, data)) + return true; + found = true; + } + } + + return found; +} + +static bool for_each_name(const char *name, symbol_callback_t func, void *data) +{ + struct symbol *sym; + bool found = false; + + if (!name) + return false; + + hash_for_each_possible(symbol_names, sym, name_hash, name_hash(name)) { + if (!strcmp(sym->name, name)) { + if (func(sym, data)) + return true; + found = true; + } + } + + return found; +} + +static bool for_each(uintptr_t addr, const char *name, symbol_callback_t func, + void *data) +{ + bool found = false; + + if (for_each_addr(addr, func, data)) + found = true; + if (for_each_name(name, func, data)) + found = true; + + return found; +} + +int symbol_read_list(FILE *file) +{ + struct symbol *sym; + char *line = NULL; + char *name = NULL; + uint64_t addr; + size_t size = 0; + + while (getline(&line, &size, file) > 0) { + if (sscanf(line, "%" PRIx64 " %ms\n", &addr, &name) != 2) { + error("malformed input line (expected 'address symbol-name'): %s", + line); + return -1; + } + + free(line); + line = NULL; + + sym = malloc(sizeof(struct symbol)); + if (!sym) { + error("malloc failed"); + return -1; + } + + debug("adding { %lx, \"%s\" }", addr, name); + + sym->addr = (uintptr_t)addr; + sym->name = name; + name = NULL; + + hash_add(symbol_addrs, &sym->addr_hash, sym->addr); + hash_add(symbol_names, &sym->name_hash, name_hash(sym->name)); + } + + if (line) + free(line); + + return 0; +} + +static bool return_symbol(struct symbol *sym, void *arg) +{ + struct symbol **res = (struct symbol **)arg; + + *res = sym; + return true; /* Stop -- return the first match */ +} + +struct symbol *symbol_get(uintptr_t addr, const char *name) +{ + struct symbol *sym; + + if (for_each(addr, name, return_symbol, &sym)) + return sym; + + return NULL; +} diff --git a/tools/gendwarfksyms/types.c b/tools/gendwarfksyms/types.c index 2a8e45ae911c..f1ce7bfcf510 100644 --- a/tools/gendwarfksyms/types.c +++ b/tools/gendwarfksyms/types.c @@ -5,6 +5,68 @@ #include "gendwarfksyms.h" +#define DEFINE_GET_ATTR(attr, type) \ + static bool get_##attr##_attr(Dwarf_Die *die, unsigned int id, \ + type *value) \ + { \ + Dwarf_Attribute da; \ + return dwarf_attr(die, id, &da) && \ + !dwarf_form##attr(&da, value); \ + } + +DEFINE_GET_ATTR(addr, Dwarf_Addr) + +static bool get_ref_die_attr(Dwarf_Die *die, unsigned int id, Dwarf_Die *value) +{ + Dwarf_Attribute da; + + /* dwarf_formref_die returns a pointer instead of an error value. */ + return dwarf_attr(die, id, &da) && dwarf_formref_die(&da, value); +} + +static const char *get_name(Dwarf_Die *die) +{ + Dwarf_Attribute attr; + + /* rustc uses DW_AT_linkage_name for exported symbols */ + if (dwarf_attr(die, DW_AT_linkage_name, &attr) || + dwarf_attr(die, DW_AT_name, &attr)) { + return dwarf_formstring(&attr); + } + + return NULL; +} + +static Dwarf_Die *get_exported(struct state *state, Dwarf_Die *die) +{ + Dwarf_Die *origin = NULL; + Dwarf_Word addr = UINTPTR_MAX; + + state->sym = NULL; + + /* If the DIE has an abstract origin, use it for type expansion. */ + if (get_ref_die_attr(die, DW_AT_abstract_origin, &state->origin)) + origin = &state->origin; + + /* + * Only one name is emitted for aliased functions, so we must match + * the address too, if available. + */ + if (get_addr_attr(die, DW_AT_low_pc, &addr) && + dwfl_module_relocate_address(state->mod, &addr) < 0) { + error("dwfl_module_relocate_address failed"); + return NULL; + } + + state->sym = symbol_get(addr, get_name(die)); + + /* Look up using the origin name if there are no matches. */ + if (!state->sym && origin) + state->sym = symbol_get(addr, get_name(origin)); + + return origin ? origin : die; +} + /* * Type string processing */ @@ -40,7 +102,7 @@ int process_die_container(struct state *state, Dwarf_Die *die, } /* - * Symbol processing + * Exported symbol processing */ static int process_subprogram(struct state *state, Dwarf_Die *die) { @@ -67,6 +129,12 @@ static int process_exported_symbols(struct state *state, Dwarf_Die *die) /* Possible exported symbols */ case DW_TAG_subprogram: case DW_TAG_variable: + die = get_exported(state, die); + if (!die || !state->sym) + return 0; + + debug("%s (@ %lx)", state->sym->name, state->sym->addr); + if (tag == DW_TAG_subprogram) check(process_subprogram(state, die)); else