From patchwork Wed Nov 25 10:44:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Tzvetomir Stoyanov (VMware)" X-Patchwork-Id: 11931155 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E10AC56202 for ; Wed, 25 Nov 2020 10:44:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22487206E0 for ; Wed, 25 Nov 2020 10:44:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="NTIxkMZU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729170AbgKYKo3 (ORCPT ); Wed, 25 Nov 2020 05:44:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727724AbgKYKo3 (ORCPT ); Wed, 25 Nov 2020 05:44:29 -0500 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED904C0613D6 for ; Wed, 25 Nov 2020 02:44:28 -0800 (PST) Received: by mail-wr1-x441.google.com with SMTP id l1so1397616wrb.9 for ; Wed, 25 Nov 2020 02:44:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=dZlhJUwlEfFKiZo906d5C7AkZYzxXUiGrgcVLTFGAHw=; b=NTIxkMZU6ZDHhz0xjXSw1bWf/eNMpXpa/2Eb40L3U8GYVjF6fg9KSC5Qh353RUGENq q7K95dR8DlqoAuR2m0jfZeqlAqnUJ8FPuGPSfbmK7sFhXJfhSSSfN3y1u/uQDEVGmRqq Bhwz5nYwYBGvjNLSkGh4EjtWYF0ytVl0yr/UN8W3hfpzkl7Trn04Xsonh1EbJGQeH61N sCQ3vqhtznjyY1MSRguCLdvJG0t/CKn6jH8H8MWTsddauJ39hkYImBywMtVdGzjYghjY ZKztFPqet7CmMq3S+3XLZnxNAAdYpkHWUPNDBzVdT2dowZN9JfOhmUkmt4mQwMmextOa Pd4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=dZlhJUwlEfFKiZo906d5C7AkZYzxXUiGrgcVLTFGAHw=; b=jRvzDcRgdZ07wzee3m0Ddm8mZSMp+NAvzY/5gznSkwynrc3GA5Cpi1pW7Gt1ab9Mz3 kRIoaCiP6jXQooK10Oe9oZcPIxacFAzXnMJWpozm3h5GOWOTjZ6jWf6lRlhIhw/52dWf YAWbo81zwEfLQ7cYXZnvFs7uHwocAcke7DFCTnob+uTjPAGUV/dQjq8vpzc8ykCsekeu fV7fueWl7r75dd3VXS9BLrWtt+sTBu9QX0IFTQgbIbAvB5n43NSvV+3fa0pLsTxGd+MW ujSXmUDgc2mM9/zYrdBD8vAazQV51ZC3+KBPX8W2ST6WMcYP+pefje+V+7yZlPuhqsWG Im2Q== X-Gm-Message-State: AOAM533QjgJvU+w3z4iBYVDgtcHi+A5c8l2eaERSvd228OZFu4I7VGGG os3p7Ckq9vvpnRpV1srMtoRvRN2ohUT4NK6O X-Google-Smtp-Source: ABdhPJwc1l1cgk6yplcOMLc9Rl/tg6SP0sKo/d2DrTae3pnlpnqGbodhlO4v5fEIr2Ivl02MaQqplw== X-Received: by 2002:adf:ee51:: with SMTP id w17mr3296523wro.373.1606301067505; Wed, 25 Nov 2020 02:44:27 -0800 (PST) Received: from oberon.zico.biz ([83.222.187.186]) by smtp.gmail.com with ESMTPSA id s4sm4026243wro.10.2020.11.25.02.44.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Nov 2020 02:44:26 -0800 (PST) From: "Tzvetomir Stoyanov (VMware)" To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH v3 2/3] trace-cmd: New internal APIs for reading ELF header Date: Wed, 25 Nov 2020 12:44:21 +0200 Message-Id: <20201125104422.823216-3-tz.stoyanov@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201125104422.823216-1-tz.stoyanov@gmail.com> References: <20201125104422.823216-1-tz.stoyanov@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org Implemented new trace-cmd internal APIs for parsing ELF header and resolving VMA to function name and function name to VMA and file offset. The bfd library is used to read and parse the binary file. The new APIs are part of trace-cmd application and are visible only inside its context. Signed-off-by: Tzvetomir Stoyanov (VMware) --- Makefile | 10 + tracecmd/include/trace-local.h | 19 + tracecmd/trace-obj-debug.c | 770 +++++++++++++++++++++++++++++++++ 3 files changed, 799 insertions(+) diff --git a/Makefile b/Makefile index 8626b91b..a59b586d 100644 --- a/Makefile +++ b/Makefile @@ -246,6 +246,16 @@ endif CUNIT_INSTALLED := $(shell if (printf "$(pound)include \n void main(){CU_initialize_registry();}" | $(CC) -x c - -lcunit >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) export CUNIT_INSTALLED +BFD_INSTALLED := $(shell if (echo -e "$(pound)include \n void main(){bfd_init();}" | $(CC) -xc - -lbfd >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) + +export BFD_INSTALLED +ifeq ($(BFD_INSTALLED), 1) +CFLAGS += -DBFD_INSTALLED +LIBS += -lbfd +else +$(warning libbfd is not installed) +endif + export CFLAGS export INCLUDES diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h index 6b469e63..933360a5 100644 --- a/tracecmd/include/trace-local.h +++ b/tracecmd/include/trace-local.h @@ -317,4 +317,23 @@ struct pid_addr_maps { int trace_debug_get_filemap(struct pid_addr_maps **file_maps, int pid); void trace_debug_free_filemap(struct pid_addr_maps *maps); +struct tracecmd_debug_symbols { + char *name; /* symbol's name */ + char *fname; /* symbol's file */ + unsigned long long vma_start; /* symbol's start VMA */ + unsigned long long vma_near; /* symbol's requested VMA */ + unsigned long long foffset; /* symbol's offset in the binary file*/ +}; +struct trace_debug_object; +struct trace_debug_object *trace_debug_obj_create_file(char *file, bool libs); +struct trace_debug_object *trace_debug_obj_create_pid(int pid); +void trace_debug_obj_destroy(struct trace_debug_object *debug); + +int trace_debug_resolve_symbols(struct trace_debug_object *obj); +int trace_debug_add_resolve_symbol(struct trace_debug_object *obj, + unsigned long long vma, char *name); + +void trace_debug_walk_resolved_symbols(struct trace_debug_object *obj, + int (*callback)(struct tracecmd_debug_symbols *, void *), + void *context); #endif /* __TRACE_LOCAL_H */ diff --git a/tracecmd/trace-obj-debug.c b/tracecmd/trace-obj-debug.c index 9aa9baae..79809a38 100644 --- a/tracecmd/trace-obj-debug.c +++ b/tracecmd/trace-obj-debug.c @@ -4,10 +4,780 @@ * */ #include +#include +#include +#include #include +#include #include +#include +#include #include "trace-local.h" +#include "trace-cmd.h" + +#define DEBUG_INTERNALS + +#ifdef BFD_INSTALLED + +struct trace_debug_handle { + bfd *bfd; + unsigned long long addr_offset; +}; + +struct trace_debug_vmem_range { + struct trace_debug_vmem_range *next; + unsigned long long start; + unsigned long long end; +}; + +enum match_type { + MATCH_EXACT = 0, + MATH_WILDCARD = 1, +}; +struct debug_symbols { + struct debug_symbols *next; + struct tracecmd_debug_symbols symbol; + enum match_type match; +}; + +struct trace_debug_file { + struct trace_debug_file *next; + char *file_name; + struct trace_debug_vmem_range *vmem; + struct trace_debug_handle *dbg; + int sym_count; + struct debug_symbols *sym; /* symbols to resolve, + * look in this file only + */ +}; + +struct trace_debug_object { + int pid; + char *fname; + struct pid_addr_maps *fmaps; + int sym_count; + struct debug_symbols *sym; /* symbols to resolve, + * look into all files + */ + struct trace_debug_file *files; +}; + +#define RESOLVE_NAME (1 << 0) +#define RESOLVE_VMA (1 << 1) +#define RESOLVE_FOFFSET (1 << 2) +struct trace_obj_job { + unsigned int flags; + unsigned long long addr_offset; + struct debug_symbols *symbols; +}; + +struct dwarf_bfd_context { + asymbol **table; + struct trace_obj_job *job; +}; + +static void process_bfd_section(bfd *abfd, asection *section, void *param) +{ + struct dwarf_bfd_context *context = (struct dwarf_bfd_context *)param; + unsigned int discriminator; + const char *functionname; + struct debug_symbols *s; + unsigned long long vma; + const char *filename; + unsigned int line; + bfd_boolean found; + + if (!(section->flags & SEC_CODE)) + return; + + for (s = context->job->symbols; s; s = s->next) { + if (s->symbol.vma_near) + vma = s->symbol.vma_near; + else if (s->symbol.vma_start) + vma = s->symbol.vma_start; + else + continue; + + if (abfd->flags & DYNAMIC) + vma -= context->job->addr_offset; + if (vma && section->vma <= vma && + (section->vma + section->size) > vma) { + if (!s->symbol.fname) + s->symbol.fname = strdup(abfd->filename); + if (context->job->flags & RESOLVE_FOFFSET) + s->symbol.foffset = section->filepos + (vma - section->vma); + if (!s->symbol.name && (context->job->flags & RESOLVE_NAME)) { + found = bfd_find_nearest_line_discriminator(abfd, section, context->table, + vma - section->vma, &filename, + &functionname, &line, &discriminator); + if (found) + s->symbol.name = strdup(functionname); + } + } + } +} + +static asymbol **get_sym_table(bfd *handle) +{ + bfd_boolean dyn = FALSE; + asymbol **symtable; + long count; + long size; + + if ((bfd_get_file_flags(handle) & HAS_SYMS) == 0) + return NULL; + size = bfd_get_symtab_upper_bound(handle); + if (size == 0) { + size = bfd_get_dynamic_symtab_upper_bound(handle); + dyn = TRUE; + } + if (size <= 0) + return NULL; + + symtable = (asymbol **) calloc(1, size); + if (!symtable) + return NULL; + if (dyn) + count = bfd_canonicalize_dynamic_symtab(handle, symtable); + else + count = bfd_canonicalize_symtab(handle, symtable); + if (count <= 0) { + free(symtable); + return NULL; + } +/* + * alloc = bfd_demangle(cur_bfd, name, demangle_flags); + */ + + return symtable; +} + +static bool sym_match(char *pattern, enum match_type match, const char *symbol) +{ + bool ret = false; + + switch (match) { + case MATCH_EXACT: + if (strlen(pattern) == strlen(symbol) && + !strcmp(pattern, symbol)) + ret = true; + break; + case MATH_WILDCARD: + if (!fnmatch(pattern, symbol, 0)) + ret = true; + break; + } + + return ret; +} + +static int lookup_bfd_sym(struct dwarf_bfd_context *context) +{ + struct debug_symbols *s, *last = NULL; + struct debug_symbols *new, *new_list = NULL; + unsigned long long vma; + asymbol **sp; + int res = 0; + + for (sp = context->table; *sp != NULL; sp++) { + if (!((*sp)->flags & BSF_FUNCTION)) + continue; + for (s = context->job->symbols; s; s = s->next) { + last = s; + if (!sym_match(s->symbol.name, s->match, (*sp)->name)) + continue; +#ifdef DEBUG_INTERNALS + printf("Matched %s, pattern %s\n\r", (*sp)->name, s->symbol.name); +#endif + vma = (*sp)->value + (*sp)->section->vma; + if ((*sp)->the_bfd->flags & DYNAMIC) + vma += context->job->addr_offset; + if (s->match == MATCH_EXACT) { /* exact match */ + s->symbol.vma_start = vma; + } else if (s->match == MATH_WILDCARD) { /* wildcard pattern match */ + new = calloc(1, sizeof(struct debug_symbols)); + if (!new) + break; + new->symbol.name = strdup((*sp)->name); + new->symbol.vma_start = vma; + new->symbol.vma_near = s->symbol.vma_near; + new->symbol.foffset = s->symbol.foffset; + if (s->symbol.fname) + new->symbol.fname = strdup(s->symbol.fname); + new->next = new_list; + new_list = new; + } + res++; + } + } + if (last && !last->next) + last->next = new_list; + + return res; +} + +static int process_bfd_object(bfd *abfd, struct trace_obj_job *job) +{ + struct dwarf_bfd_context context; + int ret = 0; + + memset(&context, 0, sizeof(context)); + context.job = job; + + if (bfd_check_format_matches(abfd, bfd_object, NULL) || + bfd_check_format_matches(abfd, bfd_core, NULL)) { + context.table = get_sym_table(abfd); + if (!context.table) + return -1; + if (job->flags & RESOLVE_VMA) + lookup_bfd_sym(&context); + if ((job->flags & RESOLVE_NAME) || (job->flags & RESOLVE_FOFFSET)) + bfd_map_over_sections(abfd, process_bfd_section, &context); + free(context.table); + } else { + ret = -1; + } + + return ret; +} + +static int read_all_bfd(bfd *abfd, struct trace_obj_job *job) +{ + bfd *last_arfile = NULL; + bfd *arfile = NULL; + int ret = 0; + + if (bfd_check_format(abfd, bfd_archive)) { + for (;;) { + bfd_set_error(bfd_error_no_error); + arfile = bfd_openr_next_archived_file(abfd, arfile); + if (!arfile) { + if (bfd_get_error() != bfd_error_no_more_archived_files) + break; + } + ret = read_all_bfd(arfile, job); + if (last_arfile) + bfd_close(last_arfile); + last_arfile = arfile; + } + if (last_arfile) + bfd_close(last_arfile); + } else + ret = process_bfd_object(abfd, job); + + return ret; +} + +/** + * resolve_symbol_vma - name -> (vma, file offset) resolving + * @obj - pointer to object, returned by trace_obj_debug_create() + * @symbols - link list with desired symbols, with given name + * + * Get VMA and file offset of the symbols with given name + * Return 0 on success, -1 on error + */ +static int resolve_symbol_vma(struct trace_debug_handle *obj, + struct debug_symbols *symbols) +{ + struct trace_obj_job job; + int ret; + + memset(&job, 0, sizeof(job)); + job.flags |= RESOLVE_VMA; + job.flags |= RESOLVE_FOFFSET; + job.symbols = symbols; + job.addr_offset = obj->addr_offset; + ret = read_all_bfd(obj->bfd, &job); + + return ret; +} + +/** + * resolve_symbol_name - vma -> name resolving + * @obj - pointer to object, returned by trace_obj_debug_create() + * @symbols - link list with desired symbols, with given VMA + * + * Get names of the symbols with given VMA, look for nearest symbol to that VMA + * Return 0 on success, -1 on error + */ +static int resolve_symbol_name(struct trace_debug_handle *obj, + struct debug_symbols *symbols) +{ + struct trace_obj_job job; + + if (!obj || !obj->bfd) + return -1; + memset(&job, 0, sizeof(job)); + job.flags |= RESOLVE_NAME; + job.addr_offset = obj->addr_offset; + job.symbols = symbols; + return read_all_bfd(obj->bfd, &job); +} + +/** + * debug_handle_destroy - Close file opened with trace_obj_debug_create() + * @obj - pointer to object, returned by trace_obj_debug_create() + * + * Close the file and free any allocated resources, related to file's debug + * information + */ +static void debug_handle_destroy(struct trace_debug_handle *obj) +{ + if (obj && obj->bfd) + bfd_close(obj->bfd); + free(obj); +} + +/** + * debug_handle_create - Open binary file for parsing ELF and DWARF information + * @name: Name of the binary ELF file. + * + * Return pointer to trace_obj_debug structure, that can be passed to other APIs + * for extracting debug information from the file. NULL in case of an error. + */ +static struct trace_debug_handle *debug_handle_create(char *file) +{ + struct trace_debug_handle *obj = NULL; + + obj = calloc(1, sizeof(*obj)); + if (!obj) + return NULL; + + bfd_init(); + obj->bfd = bfd_openr(file, NULL); + if (!obj->bfd) + goto error; + obj->bfd->flags |= BFD_DECOMPRESS; + + return obj; + +error: + debug_handle_destroy(obj); + return NULL; +} + +static void set_vma_offset(struct trace_debug_handle *obj, + unsigned long long addr_offset) +{ + if (obj) + obj->addr_offset = addr_offset; +} + +static char *get_full_name(int pid) +{ + char mapname[PATH_MAX+1]; + char fname[PATH_MAX+1]; + int ret; + + sprintf(fname, "/proc/%d/exe", pid); + ret = readlink(fname, mapname, PATH_MAX); + if (ret >= PATH_MAX || ret < 0) + return NULL; + mapname[ret] = 0; + + return strdup(mapname); +} + +static struct trace_debug_file *get_mapped_file(struct trace_debug_object *dbg, char *fname) +{ + struct trace_debug_file *file = dbg->files; + + while (file) { + if (!strcmp(fname, file->file_name)) + break; + file = file->next; + } + if (file) + return file; + + file = calloc(1, sizeof(*file)); + if (!file) + return NULL; + file->file_name = strdup(fname); + file->dbg = debug_handle_create(fname); + file->next = dbg->files; + dbg->files = file; + return file; +} + +void trace_debug_obj_destroy(struct trace_debug_object *dbg) +{ + struct trace_debug_vmem_range *mdel; + struct trace_debug_file *fdel; + struct debug_symbols *sdel; + + while (dbg->sym) { + sdel = dbg->sym; + dbg->sym = dbg->sym->next; + free(sdel->symbol.name); + free(sdel->symbol.fname); + free(sdel); + } + while (dbg->files) { + fdel = dbg->files; + dbg->files = dbg->files->next; + debug_handle_destroy(fdel->dbg); + while (fdel->sym) { + sdel = fdel->sym; + fdel->sym = fdel->sym->next; + free(sdel->symbol.name); + free(sdel->symbol.fname); + free(sdel); + } + while (fdel->vmem) { + mdel = fdel->vmem; + fdel->vmem = fdel->vmem->next; + free(mdel); + } + free(fdel); + } + + free(dbg->fname); + trace_debug_free_filemap(dbg->fmaps); + free(dbg); +} + +struct trace_debug_object *trace_debug_obj_create_pid(int pid) +{ + struct trace_debug_vmem_range *mem; + struct trace_debug_object *dbg; + struct trace_debug_file *file; + int i; + + dbg = calloc(1, sizeof(*dbg)); + if (!dbg) + return NULL; + + dbg->pid = pid; + dbg->fname = get_full_name(pid); + trace_debug_get_filemap(&dbg->fmaps, pid); + + for (i = 0; i < dbg->fmaps->nr_lib_maps; i++) { + file = get_mapped_file(dbg, dbg->fmaps->lib_maps[i].lib_name); + if (!file) + goto error; + if (file->vmem && file->vmem->end == dbg->fmaps->lib_maps[i].start) { + file->vmem->end = dbg->fmaps->lib_maps[i].end; + } else { + mem = calloc(1, sizeof(*mem)); + if (!mem) + goto error; + mem->start = dbg->fmaps->lib_maps[i].start; + mem->end = dbg->fmaps->lib_maps[i].end; + mem->next = file->vmem; + file->vmem = mem; + set_vma_offset(file->dbg, mem->start); + } + } + return dbg; + +error: + trace_debug_obj_destroy(dbg); + return NULL; +} + +static char *get_lib_full_path(char *libname) +{ + void *h = dlmopen(LM_ID_NEWLM, libname, RTLD_LAZY); + char dldir[PATH_MAX+1]; + char *fname = NULL; + int ret; + + if (!h) + return NULL; + ret = dlinfo(h, RTLD_DI_ORIGIN, dldir); + dlclose(h); + + if (!ret) { + ret = asprintf(&fname, "%s/%s", dldir, libname); + if (ret > 0) + return fname; + } + + free(fname); + return NULL; + + +} + +static int debug_obj_file_add_libs(struct trace_debug_object *dbg, + struct trace_debug_file *file) +{ + char line[PATH_MAX]; + char *libname; + char *trimmed; + char *fullname; + char *cmd = NULL; + FILE *fp = NULL; + int ret = -1; + + if (asprintf(&cmd, "LD_TRACE_LOADED_OBJECTS=1 %s", file->file_name) < 0) + return -1; + fp = popen(cmd, "r"); + if (!fp) + goto out; + + while (fgets(line, sizeof(line), fp) != NULL) { + libname = strchr(line, ' '); + trimmed = line; + if (libname) { + *libname = '\0'; + while (isspace(*trimmed)) + trimmed++; + if (*trimmed != '/') { + fullname = get_lib_full_path(trimmed); + if (fullname) { + get_mapped_file(dbg, fullname); + free(fullname); + } + } else { + get_mapped_file(dbg, trimmed); + } + } + } + +out: + if (fp) + pclose(fp); + free(cmd); + return ret; +} + +struct trace_debug_object *trace_debug_obj_create_file(char *fname, bool libs) +{ + struct trace_debug_object *dbg; + struct trace_debug_file *file; + + dbg = calloc(1, sizeof(*dbg)); + if (!dbg) + return NULL; + + dbg->fname = strdup(fname); + file = get_mapped_file(dbg, fname); + if (!file) + goto error; + if (libs) + debug_obj_file_add_libs(dbg, file); + +#ifdef DEBUG_INTERNALS + printf("Created debug object for %s:\n\r", dbg->fname); + file = dbg->files; + while (file) { + printf("\t%s\n\r", file->file_name); + file = file->next; + } +#endif + return dbg; + +error: + trace_debug_obj_destroy(dbg); + return NULL; +} + +static void set_unknown(struct debug_symbols *sym, char *file) +{ + while (sym) { + if (!sym->symbol.fname) + sym->symbol.fname = strdup(file); + sym = sym->next; + } +} + +int trace_debug_resolve_symbols(struct trace_debug_object *obj) +{ + struct trace_debug_file *file; + + for (file = obj->files; file; file = file->next) { + if (!file->dbg) { + set_unknown(file->sym, file->file_name); + continue; + } + /* near VMA -> name resolving */ + resolve_symbol_name(file->dbg, file->sym); + /* name -> exact VMA resolving */ + resolve_symbol_vma(file->dbg, file->sym); + resolve_symbol_vma(file->dbg, obj->sym); + } + + return 0; +} + +static int add_resolve_vma2name(struct trace_debug_object *obj, + unsigned long long vma) +{ + struct trace_debug_vmem_range *vmem; + struct debug_symbols *s = NULL; + struct trace_debug_file *file; + + file = obj->files; + while (file) { + if (!file->vmem) + break; + vmem = file->vmem; + while (vmem) { + if (vma >= vmem->start && vma <= vmem->end) + break; + vmem = vmem->next; + } + if (vmem) + break; + file = file->next; + } + if (file) { + s = file->sym; + while (s) { + if (s->symbol.vma_near == vma) + break; + s = s->next; + } + if (!s) { + s = calloc(1, sizeof(*s)); + if (!s) + return -1; + s->symbol.vma_near = vma; + s->next = file->sym; + file->sym = s; + file->sym_count++; + } + } + + if (s) + return 0; + return -1; +} + +static int add_resolve_name2vma(struct trace_debug_object *obj, char *name) +{ + struct debug_symbols *s = NULL; + + s = obj->sym; + while (s) { + if (s->symbol.name && !strcmp(name, s->symbol.name)) + break; + s = s->next; + } + if (!s) { + s = calloc(1, sizeof(*s)); + if (!s) + return -1; + s->symbol.name = strdup(name); + if (!s->symbol.name) + goto error; + if (strchr(name, '*') || strchr(name, '?')) + s->match = MATH_WILDCARD; + + s->next = obj->sym; + obj->sym = s; + obj->sym_count++; + } + + return 0; + +error: + if (s) { + free(s->symbol.name); + free(s); + } + return -1; +} + +int trace_debug_add_resolve_symbol(struct trace_debug_object *obj, + unsigned long long vma, char *name) +{ + int ret = -1; + + if (!obj) + return -1; + + if (!name && vma) /* vma -> name resolving */ + ret = add_resolve_vma2name(obj, vma); + else if (name) /* name -> vma resolving */ + ret = add_resolve_name2vma(obj, name); + return ret; +} + +static int walk_symbols(struct debug_symbols *sym, + int (*callback)(struct tracecmd_debug_symbols *, void *), + void *context) +{ + while (sym) { + if (callback(&sym->symbol, context)) + return -1; + sym = sym->next; + } + + return 0; +} + +void trace_debug_walk_resolved_symbols(struct trace_debug_object *obj, + int (*callback)(struct tracecmd_debug_symbols *, void *), + void *context) +{ + struct trace_debug_file *file; + + walk_symbols(obj->sym, callback, context); + file = obj->files; + while (file) { + walk_symbols(file->sym, callback, context); + file = file->next; + } +} + + +void trace_debug_free_symbols(struct tracecmd_debug_symbols *symbols, int count) +{ + int i; + + if (!symbols) + return; + + for (i = 0; i < count; i++) { + free(symbols[i].name); + free(symbols[i].fname); + } + free(symbols); + +} +#else +int trace_debug_resolve_symbols(struct trace_debug_object *obj) +{ + return -1; +} + +int trace_debug_add_resolve_symbol(struct trace_debug_object *obj, + unsigned long long vma, char *name) +{ + return -1; +} + +void trace_debug_walk_resolved_symbols(struct trace_debug_object *obj, + int (*callback)(struct tracecmd_debug_symbols *, void *), + void *context) +{ + +} + +void trace_debug_free_symbols(struct tracecmd_debug_symbols *symbols, int count) +{ + +} + +void trace_debug_obj_destroy(struct trace_debug_object *debug) +{ + +} + +struct trace_debug_object *trace_debug_obj_create_file(char *file, bool libs) +{ + return NULL; +} +struct trace_debug_object *trace_debug_obj_create_pid(int pid) +{ + return NULL; +} + +#endif #define _STRINGIFY(x) #x #define STRINGIFY(x) _STRINGIFY(x)