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File _service:tar_scm:gdb-6.6-buildid-locate.patch of Package gdb
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001 From: Fedora GDB patches <invalid@email.com> Date: Fri, 27 Oct 2017 21:07:50 +0200 Subject: gdb-6.6-buildid-locate.patch ;; New locating of the matching binaries from the pure core file (build-id). ;;=push+jan diff --git a/bfd/libbfd-in.h b/bfd/libbfd-in.h --- a/bfd/libbfd-in.h +++ b/bfd/libbfd-in.h @@ -110,7 +110,7 @@ static inline char * bfd_strdup (const char *str) { size_t len = strlen (str) + 1; - char *buf = bfd_malloc (len); + char *buf = (char *) bfd_malloc (len); if (buf != NULL) memcpy (buf, str, len); return buf; diff --git a/bfd/libbfd.h b/bfd/libbfd.h --- a/bfd/libbfd.h +++ b/bfd/libbfd.h @@ -116,7 +116,7 @@ static inline char * bfd_strdup (const char *str) { size_t len = strlen (str) + 1; - char *buf = bfd_malloc (len); + char *buf = (char *) bfd_malloc (len); if (buf != NULL) memcpy (buf, str, len); return buf; diff --git a/gdb/build-id.c b/gdb/build-id.c --- a/gdb/build-id.c +++ b/gdb/build-id.c @@ -24,14 +24,72 @@ #include "gdbsupport/gdb_vecs.h" #include "symfile.h" #include "objfiles.h" +#include <sys/stat.h> +#include "elf-bfd.h" +#include "elf/common.h" +#include "elf/external.h" +#include "elf/internal.h" #include "filenames.h" +#include "gdb_bfd.h" +#include "gdbcmd.h" #include "gdbcore.h" #include "cli/cli-style.h" +#include "inferior.h" +#include "objfiles.h" +#include "observable.h" +#include "symfile.h" + +#define BUILD_ID_VERBOSE_NONE 0 +#define BUILD_ID_VERBOSE_FILENAMES 1 +#define BUILD_ID_VERBOSE_BINARY_PARSE 2 +static int build_id_verbose = BUILD_ID_VERBOSE_FILENAMES; +static void +show_build_id_verbose (struct ui_file *file, int from_tty, + struct cmd_list_element *c, const char *value) +{ + gdb_printf (file, _("Verbosity level of the build-id locator is %s.\n"), + value); +} +/* Locate NT_GNU_BUILD_ID and return its matching debug filename. + FIXME: NOTE decoding should be unified with the BFD core notes decoding. */ + +static struct bfd_build_id * +build_id_buf_get (bfd *templ, gdb_byte *buf, bfd_size_type size) +{ + bfd_byte *p; + + p = buf; + while (p < buf + size) + { + /* FIXME: bad alignment assumption. */ + Elf_External_Note *xnp = (Elf_External_Note *) p; + size_t namesz = H_GET_32 (templ, xnp->namesz); + size_t descsz = H_GET_32 (templ, xnp->descsz); + bfd_byte *descdata = (gdb_byte *) xnp->name + BFD_ALIGN (namesz, 4); + + if (H_GET_32 (templ, xnp->type) == NT_GNU_BUILD_ID + && namesz == sizeof "GNU" + && memcmp (xnp->name, "GNU", sizeof "GNU") == 0) + { + size_t sz = descsz; + gdb_byte *data = (gdb_byte *) descdata; + struct bfd_build_id *retval; + + retval = (struct bfd_build_id *) xmalloc (sizeof *retval - 1 + sz); + retval->size = sz; + memcpy (retval->data, data, sz); + + return retval; + } + p = descdata + BFD_ALIGN (descsz, 4); + } + return NULL; +} /* See build-id.h. */ const struct bfd_build_id * -build_id_bfd_get (bfd *abfd) +build_id_bfd_shdr_get (bfd *abfd) { /* Dynamic objfiles such as ones created by JIT reader API have no underlying bfd structure (that is, objfile->obfd @@ -50,6 +108,348 @@ build_id_bfd_get (bfd *abfd) return NULL; } +/* Core files may have missing (corrupt) SHDR but PDHR is correct there. + bfd_elf_bfd_from_remote_memory () has too much overhead by + allocating/reading all the available ELF PT_LOADs. */ + +static struct bfd_build_id * +build_id_phdr_get (bfd *templ, bfd_vma loadbase, unsigned e_phnum, + Elf_Internal_Phdr *i_phdr) +{ + int i; + struct bfd_build_id *retval = NULL; + + for (i = 0; i < e_phnum; i++) + if (i_phdr[i].p_type == PT_NOTE && i_phdr[i].p_filesz > 0) + { + Elf_Internal_Phdr *hdr = &i_phdr[i]; + gdb_byte *buf; + int err; + + buf = (gdb_byte *) xmalloc (hdr->p_filesz); + err = target_read_memory (loadbase + i_phdr[i].p_vaddr, buf, + hdr->p_filesz); + if (err == 0) + retval = build_id_buf_get (templ, buf, hdr->p_filesz); + else + retval = NULL; + xfree (buf); + if (retval != NULL) + break; + } + return retval; +} + +/* First we validate the file by reading in the ELF header and checking + the magic number. */ + +static inline bfd_boolean +elf_file_p (Elf64_External_Ehdr *x_ehdrp64) +{ + gdb_assert (sizeof (Elf64_External_Ehdr) >= sizeof (Elf32_External_Ehdr)); + gdb_assert (offsetof (Elf64_External_Ehdr, e_ident) + == offsetof (Elf32_External_Ehdr, e_ident)); + gdb_assert (sizeof (((Elf64_External_Ehdr *) 0)->e_ident) + == sizeof (((Elf32_External_Ehdr *) 0)->e_ident)); + + return ((x_ehdrp64->e_ident[EI_MAG0] == ELFMAG0) + && (x_ehdrp64->e_ident[EI_MAG1] == ELFMAG1) + && (x_ehdrp64->e_ident[EI_MAG2] == ELFMAG2) + && (x_ehdrp64->e_ident[EI_MAG3] == ELFMAG3)); +} + +/* Translate an ELF file header in external format into an ELF file header in + internal format. */ + +#define H_GET_WORD(bfd, ptr) (is64 ? H_GET_64 (bfd, (ptr)) \ + : H_GET_32 (bfd, (ptr))) +#define H_GET_SIGNED_WORD(bfd, ptr) (is64 ? H_GET_S64 (bfd, (ptr)) \ + : H_GET_S32 (bfd, (ptr))) + +static void +elf_swap_ehdr_in (bfd *abfd, + const Elf64_External_Ehdr *src64, + Elf_Internal_Ehdr *dst) +{ + int is64 = bfd_get_arch_size (abfd) == 64; +#define SRC(field) (is64 ? src64->field \ + : ((const Elf32_External_Ehdr *) src64)->field) + + int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; + memcpy (dst->e_ident, SRC (e_ident), EI_NIDENT); + dst->e_type = H_GET_16 (abfd, SRC (e_type)); + dst->e_machine = H_GET_16 (abfd, SRC (e_machine)); + dst->e_version = H_GET_32 (abfd, SRC (e_version)); + if (signed_vma) + dst->e_entry = H_GET_SIGNED_WORD (abfd, SRC (e_entry)); + else + dst->e_entry = H_GET_WORD (abfd, SRC (e_entry)); + dst->e_phoff = H_GET_WORD (abfd, SRC (e_phoff)); + dst->e_shoff = H_GET_WORD (abfd, SRC (e_shoff)); + dst->e_flags = H_GET_32 (abfd, SRC (e_flags)); + dst->e_ehsize = H_GET_16 (abfd, SRC (e_ehsize)); + dst->e_phentsize = H_GET_16 (abfd, SRC (e_phentsize)); + dst->e_phnum = H_GET_16 (abfd, SRC (e_phnum)); + dst->e_shentsize = H_GET_16 (abfd, SRC (e_shentsize)); + dst->e_shnum = H_GET_16 (abfd, SRC (e_shnum)); + dst->e_shstrndx = H_GET_16 (abfd, SRC (e_shstrndx)); + +#undef SRC +} + +/* Translate an ELF program header table entry in external format into an + ELF program header table entry in internal format. */ + +static void +elf_swap_phdr_in (bfd *abfd, + const Elf64_External_Phdr *src64, + Elf_Internal_Phdr *dst) +{ + int is64 = bfd_get_arch_size (abfd) == 64; +#define SRC(field) (is64 ? src64->field \ + : ((const Elf32_External_Phdr *) src64)->field) + + int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; + + dst->p_type = H_GET_32 (abfd, SRC (p_type)); + dst->p_flags = H_GET_32 (abfd, SRC (p_flags)); + dst->p_offset = H_GET_WORD (abfd, SRC (p_offset)); + if (signed_vma) + { + dst->p_vaddr = H_GET_SIGNED_WORD (abfd, SRC (p_vaddr)); + dst->p_paddr = H_GET_SIGNED_WORD (abfd, SRC (p_paddr)); + } + else + { + dst->p_vaddr = H_GET_WORD (abfd, SRC (p_vaddr)); + dst->p_paddr = H_GET_WORD (abfd, SRC (p_paddr)); + } + dst->p_filesz = H_GET_WORD (abfd, SRC (p_filesz)); + dst->p_memsz = H_GET_WORD (abfd, SRC (p_memsz)); + dst->p_align = H_GET_WORD (abfd, SRC (p_align)); + +#undef SRC +} + +#undef H_GET_SIGNED_WORD +#undef H_GET_WORD + +static Elf_Internal_Phdr * +elf_get_phdr (bfd *templ, bfd_vma ehdr_vma, unsigned *e_phnum_pointer, + bfd_vma *loadbase_pointer) +{ + /* sizeof (Elf64_External_Ehdr) >= sizeof (Elf32_External_Ehdr) */ + Elf64_External_Ehdr x_ehdr64; /* Elf file header, external form */ + Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */ + bfd_size_type x_phdrs_size; + gdb_byte *x_phdrs_ptr; + Elf_Internal_Phdr *i_phdrs; + int err; + unsigned int i; + bfd_vma loadbase; + int loadbase_set; + + gdb_assert (templ != NULL); + gdb_assert (sizeof (Elf64_External_Ehdr) >= sizeof (Elf32_External_Ehdr)); + + /* Read in the ELF header in external format. */ + err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr64, sizeof x_ehdr64); + if (err) + { + if (build_id_verbose >= BUILD_ID_VERBOSE_BINARY_PARSE) + warning (_("build-id: Error reading ELF header at address 0x%lx"), + (unsigned long) ehdr_vma); + return NULL; + } + + /* Now check to see if we have a valid ELF file, and one that BFD can + make use of. The magic number must match, the address size ('class') + and byte-swapping must match our XVEC entry. */ + + if (! elf_file_p (&x_ehdr64) + || x_ehdr64.e_ident[EI_VERSION] != EV_CURRENT + || !((bfd_get_arch_size (templ) == 64 + && x_ehdr64.e_ident[EI_CLASS] == ELFCLASS64) + || (bfd_get_arch_size (templ) == 32 + && x_ehdr64.e_ident[EI_CLASS] == ELFCLASS32))) + { + if (build_id_verbose >= BUILD_ID_VERBOSE_BINARY_PARSE) + warning (_("build-id: Unrecognized ELF header at address 0x%lx"), + (unsigned long) ehdr_vma); + return NULL; + } + + /* Check that file's byte order matches xvec's */ + switch (x_ehdr64.e_ident[EI_DATA]) + { + case ELFDATA2MSB: /* Big-endian */ + if (! bfd_header_big_endian (templ)) + { + if (build_id_verbose >= BUILD_ID_VERBOSE_BINARY_PARSE) + warning (_("build-id: Unrecognized " + "big-endian ELF header at address 0x%lx"), + (unsigned long) ehdr_vma); + return NULL; + } + break; + case ELFDATA2LSB: /* Little-endian */ + if (! bfd_header_little_endian (templ)) + { + if (build_id_verbose >= BUILD_ID_VERBOSE_BINARY_PARSE) + warning (_("build-id: Unrecognized " + "little-endian ELF header at address 0x%lx"), + (unsigned long) ehdr_vma); + return NULL; + } + break; + case ELFDATANONE: /* No data encoding specified */ + default: /* Unknown data encoding specified */ + if (build_id_verbose >= BUILD_ID_VERBOSE_BINARY_PARSE) + warning (_("build-id: Unrecognized " + "ELF header endianity at address 0x%lx"), + (unsigned long) ehdr_vma); + return NULL; + } + + elf_swap_ehdr_in (templ, &x_ehdr64, &i_ehdr); + + /* The file header tells where to find the program headers. + These are what we use to actually choose what to read. */ + + if (i_ehdr.e_phentsize != (bfd_get_arch_size (templ) == 64 + ? sizeof (Elf64_External_Phdr) + : sizeof (Elf32_External_Phdr)) + || i_ehdr.e_phnum == 0) + { + if (build_id_verbose >= BUILD_ID_VERBOSE_BINARY_PARSE) + warning (_("build-id: Invalid ELF program headers from the ELF header " + "at address 0x%lx"), (unsigned long) ehdr_vma); + return NULL; + } + + x_phdrs_size = (bfd_get_arch_size (templ) == 64 ? sizeof (Elf64_External_Phdr) + : sizeof (Elf32_External_Phdr)); + + i_phdrs = (Elf_Internal_Phdr *) xmalloc (i_ehdr.e_phnum * (sizeof *i_phdrs + x_phdrs_size)); + x_phdrs_ptr = (gdb_byte *) &i_phdrs[i_ehdr.e_phnum]; + err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs_ptr, + i_ehdr.e_phnum * x_phdrs_size); + if (err) + { + free (i_phdrs); + if (build_id_verbose >= BUILD_ID_VERBOSE_BINARY_PARSE) + warning (_("build-id: Error reading " + "ELF program headers at address 0x%lx"), + (unsigned long) (ehdr_vma + i_ehdr.e_phoff)); + return NULL; + } + + loadbase = ehdr_vma; + loadbase_set = 0; + for (i = 0; i < i_ehdr.e_phnum; ++i) + { + elf_swap_phdr_in (templ, (Elf64_External_Phdr *) + (x_phdrs_ptr + i * x_phdrs_size), &i_phdrs[i]); + /* IA-64 vDSO may have two mappings for one segment, where one mapping + is executable only, and one is read only. We must not use the + executable one (PF_R is the first one, PF_X the second one). */ + if (i_phdrs[i].p_type == PT_LOAD && (i_phdrs[i].p_flags & PF_R)) + { + /* Only the first PT_LOAD segment indicates the file bias. + Next segments may have P_VADDR arbitrarily higher. + If the first segment has P_VADDR zero any next segment must not + confuse us, the first one sets LOADBASE certainly enough. */ + if (!loadbase_set && i_phdrs[i].p_offset == 0) + { + loadbase = ehdr_vma - i_phdrs[i].p_vaddr; + loadbase_set = 1; + } + } + } + + if (build_id_verbose >= BUILD_ID_VERBOSE_BINARY_PARSE) + warning (_("build-id: Found ELF header at address 0x%lx, loadbase 0x%lx"), + (unsigned long) ehdr_vma, (unsigned long) loadbase); + + *e_phnum_pointer = i_ehdr.e_phnum; + *loadbase_pointer = loadbase; + return i_phdrs; +} + +/* BUILD_ID_ADDR_GET gets ADDR located somewhere in the object. + Find the first section before ADDR containing an ELF header. + We rely on the fact the sections from multiple files do not mix. + FIXME: We should check ADDR is contained _inside_ the section with possibly + missing content (P_FILESZ < P_MEMSZ). These omitted sections are currently + hidden by _BFD_ELF_MAKE_SECTION_FROM_PHDR. */ + +static CORE_ADDR build_id_addr; +struct build_id_addr_sect + { + struct build_id_addr_sect *next; + asection *sect; + }; +static struct build_id_addr_sect *build_id_addr_sect; + +static void build_id_addr_candidate (bfd *abfd, asection *sect, void *obj) +{ + if (build_id_addr >= bfd_section_vma (sect)) + { + struct build_id_addr_sect *candidate; + + candidate = (struct build_id_addr_sect *) xmalloc (sizeof *candidate); + candidate->next = build_id_addr_sect; + build_id_addr_sect = candidate; + candidate->sect = sect; + } +} + +struct bfd_build_id * +build_id_addr_get (CORE_ADDR addr) +{ + struct build_id_addr_sect *candidate; + struct bfd_build_id *retval = NULL; + Elf_Internal_Phdr *i_phdr = NULL; + bfd_vma loadbase = 0; + unsigned e_phnum = 0; + + if (core_bfd == NULL) + return NULL; + + build_id_addr = addr; + gdb_assert (build_id_addr_sect == NULL); + bfd_map_over_sections (core_bfd, build_id_addr_candidate, NULL); + + /* Sections are sorted in the high-to-low VMAs order. + Stop the search on the first ELF header we find. + Do not continue the search even if it does not contain NT_GNU_BUILD_ID. */ + + for (candidate = build_id_addr_sect; candidate != NULL; + candidate = candidate->next) + { + i_phdr = elf_get_phdr (core_bfd, + bfd_section_vma (candidate->sect), + &e_phnum, &loadbase); + if (i_phdr != NULL) + break; + } + + if (i_phdr != NULL) + { + retval = build_id_phdr_get (core_bfd, loadbase, e_phnum, i_phdr); + xfree (i_phdr); + } + + while (build_id_addr_sect != NULL) + { + candidate = build_id_addr_sect; + build_id_addr_sect = candidate->next; + xfree (candidate); + } + + return retval; +} + /* See build-id.h. */ int @@ -58,7 +458,7 @@ build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check) const struct bfd_build_id *found; int retval = 0; - found = build_id_bfd_get (abfd); + found = build_id_bfd_shdr_get (abfd); if (found == NULL) warning (_("File \"%s\" has no build-id, file skipped"), @@ -73,63 +473,166 @@ build_id_verify (bfd *abfd, size_t check_len, const bfd_byte *check) return retval; } +static char * +link_resolve (const char *symlink, int level) +{ + char buf[PATH_MAX + 1], *retval; + gdb::unique_xmalloc_ptr<char> target; + ssize_t got; + + if (level > 10) + return xstrdup (symlink); + + got = readlink (symlink, buf, sizeof (buf)); + if (got < 0 || got >= sizeof (buf)) + return xstrdup (symlink); + buf[got] = '\0'; + + if (IS_ABSOLUTE_PATH (buf)) + target = make_unique_xstrdup (buf); + else + { + const std::string dir (ldirname (symlink)); + + target = xstrprintf ("%s" +#ifndef HAVE_DOS_BASED_FILE_SYSTEM + "/" +#else /* HAVE_DOS_BASED_FILE_SYSTEM */ + "\\" +#endif /* HAVE_DOS_BASED_FILE_SYSTEM */ + "%s", dir.c_str(), buf); + } + + retval = link_resolve (target.get (), level + 1); + return retval; +} + /* Helper for build_id_to_debug_bfd. LINK is a path to a potential build-id-based separate debug file, potentially a symlink to the real file. If the file exists and matches BUILD_ID, return a BFD reference to it. */ static gdb_bfd_ref_ptr -build_id_to_debug_bfd_1 (const std::string &link, size_t build_id_len, - const bfd_byte *build_id) +build_id_to_debug_bfd_1 (const std::string &orig_link, size_t build_id_len, + const bfd_byte *build_id, char **link_return) { + gdb_bfd_ref_ptr ret_bfd = {}; + std::string ret_link; + if (separate_debug_file_debug) { - gdb_printf (gdb_stdlog, _(" Trying %s..."), link.c_str ()); - gdb_flush (gdb_stdlog); + gdb_printf (gdb_stdlog, _(" Trying %s..."), orig_link.c_str ()); + gdb_flush (gdb_stdout); } - /* lrealpath() is expensive even for the usually non-existent files. */ - gdb::unique_xmalloc_ptr<char> filename_holder; - const char *filename = nullptr; - if (startswith (link, TARGET_SYSROOT_PREFIX)) - filename = link.c_str (); - else if (access (link.c_str (), F_OK) == 0) + for (unsigned seqno = 0;; seqno++) { - filename_holder.reset (lrealpath (link.c_str ())); - filename = filename_holder.get (); - } + std::string link = orig_link; - if (filename == NULL) - { - if (separate_debug_file_debug) - gdb_printf (gdb_stdlog, - _(" no, unable to compute real path\n")); + if (seqno > 0) + { + /* There can be multiple build-id symlinks pointing to real files + with the same build-id (such as hard links). Some of the real + files may not be installed. */ - return {}; - } + string_appendf (link, ".%u", seqno); + } - /* We expect to be silent on the non-existing files. */ - gdb_bfd_ref_ptr debug_bfd = gdb_bfd_open (filename, gnutarget); + ret_link = link; - if (debug_bfd == NULL) - { - if (separate_debug_file_debug) - gdb_printf (gdb_stdlog, _(" no, unable to open.\n")); + struct stat statbuf_trash; + + /* `access' automatically dereferences LINK. */ + if (lstat (link.c_str (), &statbuf_trash) != 0) + { + /* Stop increasing SEQNO. */ + break; + } + + /* lrealpath() is expensive even for the usually non-existent files. */ + gdb::unique_xmalloc_ptr<char> filename_holder; + const char *filename = nullptr; + if (startswith (link, TARGET_SYSROOT_PREFIX)) + filename = link.c_str (); + else if (access (link.c_str (), F_OK) == 0) + { + filename_holder.reset (lrealpath (link.c_str ())); + filename = filename_holder.get (); + } + + if (filename == NULL) + { + if (separate_debug_file_debug) + gdb_printf (gdb_stdlog, + _(" no, unable to compute real path\n")); + + continue; + } + + /* We expect to be silent on the non-existing files. */ + gdb_bfd_ref_ptr debug_bfd = gdb_bfd_open (filename, gnutarget); + + if (debug_bfd == NULL) + { + if (separate_debug_file_debug) + gdb_printf (gdb_stdlog, _(" no, unable to open.\n")); - return {}; + continue; + } + + if (!build_id_verify (debug_bfd.get(), build_id_len, build_id)) + { + if (separate_debug_file_debug) + gdb_printf (gdb_stdlog, + _(" no, build-id does not match.\n")); + + continue; + } + + ret_bfd = debug_bfd; + break; } - if (!build_id_verify (debug_bfd.get(), build_id_len, build_id)) + std::string link_all; + + if (ret_bfd != NULL) { if (separate_debug_file_debug) - gdb_printf (gdb_stdlog, _(" no, build-id does not match.\n")); + gdb_printf (gdb_stdlog, _(" yes!\n")); + } + else + { + /* If none of the real files is found report as missing file + always the non-.%u-suffixed file. */ + std::string link0 = orig_link; - return {}; + /* If the symlink has target request to install the target. + BASE-debuginfo.rpm contains the symlink but BASE.rpm may be missing. + https://bugzilla.redhat.com/show_bug.cgi?id=981154 */ + std::string link0_resolved (link_resolve (link0.c_str (), 0)); + + if (link_all.empty ()) + link_all = link0_resolved; + else + { + /* Use whitespace instead of DIRNAME_SEPARATOR to be compatible with + its possible use as an argument for installation command. */ + link_all += " " + link0_resolved; + } } - if (separate_debug_file_debug) - gdb_printf (gdb_stdlog, _(" yes!\n")); + if (link_return != NULL) + { + if (ret_bfd != NULL) + { + *link_return = xstrdup (ret_link.c_str ()); + } + else + { + *link_return = xstrdup (link_all.c_str ()); + } + } - return debug_bfd; + return ret_bfd; } /* Common code for finding BFDs of a given build-id. This function @@ -138,7 +641,7 @@ build_id_to_debug_bfd_1 (const std::string &link, size_t build_id_len, static gdb_bfd_ref_ptr build_id_to_bfd_suffix (size_t build_id_len, const bfd_byte *build_id, - const char *suffix) + const char *suffix, char **link_return) { /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will cause "/.build-id/..." lookups. */ @@ -161,16 +664,17 @@ build_id_to_bfd_suffix (size_t build_id_len, const bfd_byte *build_id, if (size > 0) { size--; - string_appendf (link, "%02x/", (unsigned) *data++); + string_appendf (link, "%02x", (unsigned) *data++); } - + if (size > 0) + link += "/"; while (size-- > 0) string_appendf (link, "%02x", (unsigned) *data++); link += suffix; gdb_bfd_ref_ptr debug_bfd - = build_id_to_debug_bfd_1 (link, build_id_len, build_id); + = build_id_to_debug_bfd_1 (link, build_id_len, build_id, link_return); if (debug_bfd != NULL) return debug_bfd; @@ -181,7 +685,7 @@ build_id_to_bfd_suffix (size_t build_id_len, const bfd_byte *build_id, if (!gdb_sysroot.empty ()) { link = gdb_sysroot + link; - debug_bfd = build_id_to_debug_bfd_1 (link, build_id_len, build_id); + debug_bfd = build_id_to_debug_bfd_1 (link, build_id_len, build_id, NULL); if (debug_bfd != NULL) return debug_bfd; } @@ -190,31 +694,663 @@ build_id_to_bfd_suffix (size_t build_id_len, const bfd_byte *build_id, return {}; } +char * +build_id_to_filename (const struct bfd_build_id *build_id, char **link_return) +{ + gdb_bfd_ref_ptr abfd; + char *result; + + abfd = build_id_to_exec_bfd (build_id->size, build_id->data, link_return); + if (abfd == NULL) + return NULL; + + result = xstrdup (bfd_get_filename (abfd.get ())); + return result; +} + +void debug_flush_missing (void); + +#ifdef HAVE_LIBRPM + +#include <rpm/rpmlib.h> +#include <rpm/rpmts.h> +#include <rpm/rpmdb.h> +#include <rpm/header.h> +#ifdef DLOPEN_LIBRPM +#include <dlfcn.h> +#endif + +/* Workarodun https://bugzilla.redhat.com/show_bug.cgi?id=643031 + librpm must not exit() an application on SIGINT + + Enable or disable a signal handler. SIGNUM: signal to enable (or disable + if negative). HANDLER: sa_sigaction handler (or NULL to use + rpmsqHandler()). Returns: no. of refs, -1 on error. */ +extern int rpmsqEnable (int signum, /* rpmsqAction_t handler */ void *handler); +int +rpmsqEnable (int signum, /* rpmsqAction_t handler */ void *handler) +{ + return 0; +} + +/* This MISSING_RPM_HASH tracker is used to collect all the missing rpm files + and avoid their duplicities during a single inferior run. */ + +static struct htab *missing_rpm_hash; + +/* This MISSING_RPM_LIST tracker is used to collect and print as a single line + all the rpms right before the nearest GDB prompt. It gets cleared after + each such print (it is questionable if we should clear it after the print). + */ + +struct missing_rpm + { + struct missing_rpm *next; + char rpm[1]; + }; +static struct missing_rpm *missing_rpm_list; +static int missing_rpm_list_entries; + +/* Returns the count of newly added rpms. */ + +static int +#ifndef GDB_INDEX_VERIFY_VENDOR +missing_rpm_enlist (const char *filename) +#else +missing_rpm_enlist_1 (const char *filename, int verify_vendor) +#endif +{ + static int rpm_init_done = 0; + rpmts ts; + rpmdbMatchIterator mi; + int count = 0; + +#ifdef DLOPEN_LIBRPM + /* Duplicate here the declarations to verify they match. The same sanity + check is present also in `configure.ac'. */ + extern char * headerFormat(Header h, const char * fmt, errmsg_t * errmsg); + static char *(*headerFormat_p) (Header h, const char * fmt, errmsg_t *errmsg); + extern int rpmReadConfigFiles(const char * file, const char * target); + static int (*rpmReadConfigFiles_p) (const char * file, const char * target); + extern rpmdbMatchIterator rpmdbFreeIterator(rpmdbMatchIterator mi); + static rpmdbMatchIterator (*rpmdbFreeIterator_p) (rpmdbMatchIterator mi); + extern Header rpmdbNextIterator(rpmdbMatchIterator mi); + static Header (*rpmdbNextIterator_p) (rpmdbMatchIterator mi); + extern rpmts rpmtsCreate(void); + static rpmts (*rpmtsCreate_p) (void); + extern rpmts rpmtsFree(rpmts ts); + static rpmts (*rpmtsFree_p) (rpmts ts); + extern rpmdbMatchIterator rpmtsInitIterator(const rpmts ts, rpmTag rpmtag, + const void * keyp, size_t keylen); + static rpmdbMatchIterator (*rpmtsInitIterator_p) (const rpmts ts, + rpmTag rpmtag, + const void *keyp, + size_t keylen); +#else /* !DLOPEN_LIBRPM */ +# define headerFormat_p headerFormat +# define rpmReadConfigFiles_p rpmReadConfigFiles +# define rpmdbFreeIterator_p rpmdbFreeIterator +# define rpmdbNextIterator_p rpmdbNextIterator +# define rpmtsCreate_p rpmtsCreate +# define rpmtsFree_p rpmtsFree +# define rpmtsInitIterator_p rpmtsInitIterator +#endif /* !DLOPEN_LIBRPM */ + + gdb_assert (filename != NULL); + + if (strcmp (filename, BUILD_ID_MAIN_EXECUTABLE_FILENAME) == 0) + return 0; + + if (is_target_filename (filename)) + return 0; + + if (filename[0] != '/') + { + warning (_("Ignoring non-absolute filename: <%s>"), filename); + return 0; + } + + if (!rpm_init_done) + { + static int init_tried; + + /* Already failed the initialization before? */ + if (init_tried) + return 0; + init_tried = 1; + +#ifdef DLOPEN_LIBRPM + { + void *h; + + h = dlopen (DLOPEN_LIBRPM, RTLD_LAZY); + if (!h) + { + warning (_("Unable to open \"%s\" (%s), " + "missing debuginfos notifications will not be displayed"), + DLOPEN_LIBRPM, dlerror ()); + return 0; + } + + if (!((headerFormat_p = (char *(*) (Header h, const char * fmt, errmsg_t *errmsg)) dlsym (h, "headerFormat")) + && (rpmReadConfigFiles_p = (int (*) (const char * file, const char * target)) dlsym (h, "rpmReadConfigFiles")) + && (rpmdbFreeIterator_p = (rpmdbMatchIterator (*) (rpmdbMatchIterator mi)) dlsym (h, "rpmdbFreeIterator")) + && (rpmdbNextIterator_p = (Header (*) (rpmdbMatchIterator mi)) dlsym (h, "rpmdbNextIterator")) + && (rpmtsCreate_p = (rpmts (*) (void)) dlsym (h, "rpmtsCreate")) + && (rpmtsFree_p = (rpmts (*) (rpmts ts)) dlsym (h, "rpmtsFree")) + && (rpmtsInitIterator_p = (rpmdbMatchIterator (*) (const rpmts ts, rpmTag rpmtag, const void *keyp, size_t keylen)) dlsym (h, "rpmtsInitIterator")))) + { + warning (_("Opened library \"%s\" is incompatible (%s), " + "missing debuginfos notifications will not be displayed"), + DLOPEN_LIBRPM, dlerror ()); + if (dlclose (h)) + warning (_("Error closing library \"%s\": %s\n"), DLOPEN_LIBRPM, + dlerror ()); + return 0; + } + } +#endif /* DLOPEN_LIBRPM */ + + if (rpmReadConfigFiles_p (NULL, NULL) != 0) + { + warning (_("Error reading the rpm configuration files")); + return 0; + } + + rpm_init_done = 1; + } + + ts = rpmtsCreate_p (); + + mi = rpmtsInitIterator_p (ts, RPMTAG_BASENAMES, filename, 0); + if (mi != NULL) + { +#ifndef GDB_INDEX_VERIFY_VENDOR + for (;;) +#else + if (!verify_vendor) for (;;) +#endif + { + Header h; + char *debuginfo, **slot, *s, *s2; + errmsg_t err; + size_t srcrpmlen = sizeof (".src.rpm") - 1; + size_t debuginfolen = sizeof ("-debuginfo") - 1; + rpmdbMatchIterator mi_debuginfo; + + h = rpmdbNextIterator_p (mi); + if (h == NULL) + break; + + /* Verify the debuginfo file is not already installed. */ + + debuginfo = headerFormat_p (h, "%{sourcerpm}-debuginfo.%{arch}", + &err); + if (!debuginfo) + { + warning (_("Error querying the rpm file `%s': %s"), filename, + err); + continue; + } + /* s = `.src.rpm-debuginfo.%{arch}' */ + s = strrchr (debuginfo, '-') - srcrpmlen; + s2 = NULL; + if (s > debuginfo && memcmp (s, ".src.rpm", srcrpmlen) == 0) + { + /* s2 = `-%{release}.src.rpm-debuginfo.%{arch}' */ + s2 = (char *) memrchr (debuginfo, '-', s - debuginfo); + } + if (s2) + { + /* s2 = `-%{version}-%{release}.src.rpm-debuginfo.%{arch}' */ + s2 = (char *) memrchr (debuginfo, '-', s2 - debuginfo); + } + if (!s2) + { + warning (_("Error querying the rpm file `%s': %s"), filename, + debuginfo); + xfree (debuginfo); + continue; + } + /* s = `.src.rpm-debuginfo.%{arch}' */ + /* s2 = `-%{version}-%{release}.src.rpm-debuginfo.%{arch}' */ + memmove (s2 + debuginfolen, s2, s - s2); + memcpy (s2, "-debuginfo", debuginfolen); + /* s = `XXXX.%{arch}' */ + /* strlen ("XXXX") == srcrpmlen + debuginfolen */ + /* s2 = `-debuginfo-%{version}-%{release}XX.%{arch}' */ + /* strlen ("XX") == srcrpmlen */ + memmove (s + debuginfolen, s + srcrpmlen + debuginfolen, + strlen (s + srcrpmlen + debuginfolen) + 1); + /* s = `-debuginfo-%{version}-%{release}.%{arch}' */ + + /* RPMDBI_PACKAGES requires keylen == sizeof (int). */ + /* RPMDBI_LABEL is an interface for NVR-based dbiFindByLabel(). */ + mi_debuginfo = rpmtsInitIterator_p (ts, (rpmTag) RPMDBI_LABEL, debuginfo, 0); + xfree (debuginfo); + if (mi_debuginfo) + { + rpmdbFreeIterator_p (mi_debuginfo); + count = 0; + break; + } + + /* The allocated memory gets utilized below for MISSING_RPM_HASH. */ + debuginfo = headerFormat_p (h, + "%{name}-%{version}-%{release}.%{arch}", + &err); + if (!debuginfo) + { + warning (_("Error querying the rpm file `%s': %s"), filename, + err); + continue; + } + + /* Base package name for `debuginfo-install'. We do not use the + `yum' command directly as the line + yum --enablerepo='*debug*' install NAME-debuginfo.ARCH + would be more complicated than just: + debuginfo-install NAME-VERSION-RELEASE.ARCH + Do not supply the rpm base name (derived from .src.rpm name) as + debuginfo-install is unable to install the debuginfo package if + the base name PKG binary rpm is not installed while for example + PKG-libs would be installed (RH Bug 467901). + FUTURE: After multiple debuginfo versions simultaneously installed + get supported the support for the VERSION-RELEASE tags handling + may need an update. */ + + if (missing_rpm_hash == NULL) + { + /* DEL_F is passed NULL as MISSING_RPM_LIST's HTAB_DELETE + should not deallocate the entries. */ + + missing_rpm_hash = htab_create_alloc (64, htab_hash_string, + (int (*) (const void *, const void *)) streq, + NULL, xcalloc, xfree); + } + slot = (char **) htab_find_slot (missing_rpm_hash, debuginfo, INSERT); + /* XCALLOC never returns NULL. */ + gdb_assert (slot != NULL); + if (*slot == NULL) + { + struct missing_rpm *missing_rpm; + + *slot = debuginfo; + + missing_rpm = (struct missing_rpm *) xmalloc (sizeof (*missing_rpm) + strlen (debuginfo)); + strcpy (missing_rpm->rpm, debuginfo); + missing_rpm->next = missing_rpm_list; + missing_rpm_list = missing_rpm; + missing_rpm_list_entries++; + } + else + xfree (debuginfo); + count++; + } +#ifdef GDB_INDEX_VERIFY_VENDOR + else /* verify_vendor */ + { + int vendor_pass = 0, vendor_fail = 0; + + for (;;) + { + Header h; + errmsg_t err; + char *vendor; + + h = rpmdbNextIterator_p (mi); + if (h == NULL) + break; + + vendor = headerFormat_p (h, "%{vendor}", &err); + if (!vendor) + { + warning (_("Error querying the rpm file `%s': %s"), filename, + err); + continue; + } + if (strcmp (vendor, "Red Hat, Inc.") == 0) + vendor_pass = 1; + else + vendor_fail = 1; + xfree (vendor); + } + count = vendor_pass != 0 && vendor_fail == 0; + } +#endif + + rpmdbFreeIterator_p (mi); + } + + rpmtsFree_p (ts); + + return count; +} + +#ifdef GDB_INDEX_VERIFY_VENDOR +missing_rpm_enlist (const char *filename) +{ + return missing_rpm_enlist_1 (filename, 0); +} + +extern int rpm_verify_vendor (const char *filename); +int +rpm_verify_vendor (const char *filename) +{ + return missing_rpm_enlist_1 (filename, 1); +} +#endif + +static bool +missing_rpm_list_compar (const char *ap, const char *bp) +{ + return strcoll (ap, bp) < 0; +} + +/* It returns a NULL-terminated array of strings needing to be FREEd. It may + also return only NULL. */ + +static void +missing_rpm_list_print (void) +{ + struct missing_rpm *list_iter; + + if (missing_rpm_list_entries == 0) + return; + + std::vector<const char *> array (missing_rpm_list_entries); + size_t idx = 0; + + for (list_iter = missing_rpm_list; list_iter != NULL; + list_iter = list_iter->next) + { + array[idx++] = list_iter->rpm; + } + gdb_assert (idx == missing_rpm_list_entries); + + std::sort (array.begin (), array.end (), missing_rpm_list_compar); + + /* We zero out the number of missing RPMs here because of a nasty + bug (see RHBZ 1801974). + + When we call 'puts_unfiltered' below, if pagination is on and if + the number of missing RPMs is big enough to trigger pagination, + we will end up in an infinite recursion. The call chain looks + like this: + + missing_rpm_list_print -> puts_unfiltered -> fputs_maybe_filtered + -> prompt_for_continue -> display_gdb_prompt -> + debug_flush_missing -> missing_rpm_list_print ... + + For this reason, we make sure MISSING_RPM_LIST_ENTRIES is zero + *before* calling any print function. + + Note: kevinb/2023-02-22: The code below used to call + puts_unfiltered() and printf_unfiltered(), but calls to these + functions have been replaced by calls to gdb_printf(). The call + chain shown above (probably) used to be the case at one time and + hopefully something similar is still the case now that + gdb_printf() is being used instead. */ + missing_rpm_list_entries = 0; + + gdb_printf (_("Missing separate debuginfos, use: %s"), +#ifdef DNF_DEBUGINFO_INSTALL + "dnf " +#endif + "debuginfo-install"); + for (const char *el : array) + { + gdb_printf (" %s", el); + } + gdb_printf ("\n"); + + while (missing_rpm_list != NULL) + { + list_iter = missing_rpm_list; + missing_rpm_list = list_iter->next; + xfree (list_iter); + } +} + +static void +missing_rpm_change (void) +{ + debug_flush_missing (); + + gdb_assert (missing_rpm_list == NULL); + if (missing_rpm_hash != NULL) + { + htab_delete (missing_rpm_hash); + missing_rpm_hash = NULL; + } +} + +enum missing_exec + { + /* Init state. EXEC_BFD also still could be NULL. */ + MISSING_EXEC_NOT_TRIED, + /* We saw a non-NULL EXEC_BFD but RPM has no info about it. */ + MISSING_EXEC_NOT_FOUND, + /* We found EXEC_BFD by RPM and we either have its symbols (either embedded + or separate) or the main executable's RPM is now contained in + MISSING_RPM_HASH. */ + MISSING_EXEC_ENLISTED + }; +static enum missing_exec missing_exec = MISSING_EXEC_NOT_TRIED; + +#endif /* HAVE_LIBRPM */ + +void +debug_flush_missing (void) +{ +#ifdef HAVE_LIBRPM + missing_rpm_list_print (); +#endif +} + +/* This MISSING_FILEPAIR_HASH tracker is used only for the duplicite messages + yum --enablerepo='*debug*' install ... + avoidance. */ + +struct missing_filepair + { + char *binary; + char *debug; + char data[1]; + }; + +static struct htab *missing_filepair_hash; +static struct obstack missing_filepair_obstack; + +static void * +missing_filepair_xcalloc (size_t nmemb, size_t nmemb_size) +{ + void *retval; + size_t size = nmemb * nmemb_size; + + retval = obstack_alloc (&missing_filepair_obstack, size); + memset (retval, 0, size); + return retval; +} + +static hashval_t +missing_filepair_hash_func (const struct missing_filepair *elem) +{ + hashval_t retval = 0; + + retval ^= htab_hash_string (elem->binary); + if (elem->debug != NULL) + retval ^= htab_hash_string (elem->debug); + + return retval; +} + +static int +missing_filepair_eq (const struct missing_filepair *elem1, + const struct missing_filepair *elem2) +{ + return strcmp (elem1->binary, elem2->binary) == 0 + && ((elem1->debug == NULL) == (elem2->debug == NULL)) + && (elem1->debug == NULL || strcmp (elem1->debug, elem2->debug) == 0); +} + +static void +missing_filepair_change (void) +{ + if (missing_filepair_hash != NULL) + { + obstack_free (&missing_filepair_obstack, NULL); + /* All their memory came just from missing_filepair_OBSTACK. */ + missing_filepair_hash = NULL; + } +#ifdef HAVE_LIBRPM + missing_exec = MISSING_EXEC_NOT_TRIED; +#endif +} + +static void +debug_print_executable_changed (struct program_space *pspace, bool reload_p) +{ +#ifdef HAVE_LIBRPM + missing_rpm_change (); +#endif + missing_filepair_change (); +} + +/* Notify user the file BINARY with (possibly NULL) associated separate debug + information file DEBUG is missing. DEBUG may or may not be the build-id + file such as would be: + /usr/lib/debug/.build-id/dd/b1d2ce632721c47bb9e8679f369e2295ce71be.debug + */ + +void +debug_print_missing (const char *binary, const char *debug) +{ + size_t binary_len0 = strlen (binary) + 1; + size_t debug_len0 = debug ? strlen (debug) + 1 : 0; + struct missing_filepair missing_filepair_find; + struct missing_filepair *missing_filepair; + struct missing_filepair **slot; + + if (build_id_verbose < BUILD_ID_VERBOSE_FILENAMES) + return; + + if (missing_filepair_hash == NULL) + { + obstack_init (&missing_filepair_obstack); + missing_filepair_hash = htab_create_alloc (64, + (hashval_t (*) (const void *)) missing_filepair_hash_func, + (int (*) (const void *, const void *)) missing_filepair_eq, NULL, + missing_filepair_xcalloc, NULL); + } + + /* Use MISSING_FILEPAIR_FIND first instead of calling obstack_alloc with + obstack_free in the case of a (rare) match. The problem is ALLOC_F for + MISSING_FILEPAIR_HASH allocates from MISSING_FILEPAIR_OBSTACK maintenance + structures for MISSING_FILEPAIR_HASH. Calling obstack_free would possibly + not to free only MISSING_FILEPAIR but also some such structures (allocated + during the htab_find_slot call). */ + + missing_filepair_find.binary = (char *) binary; + missing_filepair_find.debug = (char *) debug; + slot = (struct missing_filepair **) htab_find_slot (missing_filepair_hash, + &missing_filepair_find, + INSERT); + + /* While it may be still printed duplicitely with the missing debuginfo file + * it is due to once printing about the binary file build-id link and once + * about the .debug file build-id link as both the build-id symlinks are + * located in the debuginfo package. */ + + if (*slot != NULL) + return; + + missing_filepair = (struct missing_filepair *) obstack_alloc (&missing_filepair_obstack, + sizeof (*missing_filepair) - 1 + + binary_len0 + debug_len0); + missing_filepair->binary = missing_filepair->data; + memcpy (missing_filepair->binary, binary, binary_len0); + if (debug != NULL) + { + missing_filepair->debug = missing_filepair->binary + binary_len0; + memcpy (missing_filepair->debug, debug, debug_len0); + } + else + missing_filepair->debug = NULL; + + *slot = missing_filepair; + +#ifdef HAVE_LIBRPM + if (missing_exec == MISSING_EXEC_NOT_TRIED) + { + const char *execfilename = get_exec_file (0); + + if (execfilename != NULL) + { + if (missing_rpm_enlist (execfilename) == 0) + missing_exec = MISSING_EXEC_NOT_FOUND; + else + missing_exec = MISSING_EXEC_ENLISTED; + } + } + if (missing_exec != MISSING_EXEC_ENLISTED) + if ((binary[0] == 0 || missing_rpm_enlist (binary) == 0) + && (debug == NULL || missing_rpm_enlist (debug) == 0)) +#endif /* HAVE_LIBRPM */ + { + /* We do not collect and flush these messages as each such message + already requires its own separate lines. */ + + gdb_printf (gdb_stdlog, + _("Missing separate debuginfo for %s.\n"), binary); + if (debug != NULL) + { + if (access (debug, F_OK) == 0) { + gdb_printf (gdb_stdlog, _("Try: %s %s\n"), +#ifdef DNF_DEBUGINFO_INSTALL + "dnf" +#else + "yum" +#endif + " --enablerepo='*debug*' install", debug); + } else + gdb_printf (gdb_stdlog, _("The debuginfo package for this file is probably broken.\n")); + } + } +} + /* See build-id.h. */ gdb_bfd_ref_ptr -build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id) +build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id, + char **link_return) { - return build_id_to_bfd_suffix (build_id_len, build_id, ".debug"); + return build_id_to_bfd_suffix (build_id_len, build_id, ".debug", + link_return); } /* See build-id.h. */ gdb_bfd_ref_ptr -build_id_to_exec_bfd (size_t build_id_len, const bfd_byte *build_id) +build_id_to_exec_bfd (size_t build_id_len, const bfd_byte *build_id, + char **link_return) { - return build_id_to_bfd_suffix (build_id_len, build_id, ""); + return build_id_to_bfd_suffix (build_id_len, build_id, "", link_return); } /* See build-id.h. */ std::string find_separate_debug_file_by_buildid (struct objfile *objfile, - deferred_warnings *warnings) + deferred_warnings *warnings, + gdb::unique_xmalloc_ptr<char> *build_id_filename_return) { const struct bfd_build_id *build_id; - build_id = build_id_bfd_get (objfile->obfd.get ()); + if (build_id_filename_return) + *build_id_filename_return = NULL; + + build_id = build_id_bfd_shdr_get (objfile->obfd.get ()); if (build_id != NULL) { if (separate_debug_file_debug) @@ -222,8 +1358,21 @@ find_separate_debug_file_by_buildid (struct objfile *objfile, _("\nLooking for separate debug info (build-id) for " "%s\n"), objfile_name (objfile)); + char *build_id_filename_cstr = NULL; gdb_bfd_ref_ptr abfd (build_id_to_debug_bfd (build_id->size, - build_id->data)); + build_id->data, + (!build_id_filename_return ? NULL : &build_id_filename_cstr))); + if (build_id_filename_return) + { + if (!build_id_filename_cstr) + gdb_assert (!*build_id_filename_return); + else + { + *build_id_filename_return = gdb::unique_xmalloc_ptr<char> (build_id_filename_cstr); + build_id_filename_cstr = NULL; + } + } + /* Prevent looping on a stripped .debug file. */ if (abfd != NULL && filename_cmp (bfd_get_filename (abfd.get ()), @@ -243,3 +1392,22 @@ find_separate_debug_file_by_buildid (struct objfile *objfile, return std::string (); } + +void _initialize_build_id (); + +void +_initialize_build_id () +{ + add_setshow_zinteger_cmd ("build-id-verbose", no_class, &build_id_verbose, + _("\ +Set debugging level of the build-id locator."), _("\ +Show debugging level of the build-id locator."), _("\ +Level 1 (default) enables printing the missing debug filenames,\n\ +level 2 also prints the parsing of binaries to find the identificators."), + NULL, + show_build_id_verbose, + &setlist, &showlist); + + gdb::observers::executable_changed.attach (debug_print_executable_changed, + "build-id"); +} diff --git a/gdb/build-id.h b/gdb/build-id.h --- a/gdb/build-id.h +++ b/gdb/build-id.h @@ -23,9 +23,10 @@ #include "gdb_bfd.h" #include "gdbsupport/rsp-low.h" -/* Locate NT_GNU_BUILD_ID from ABFD and return its content. */ +/* Separate debuginfo files have corrupted PHDR but SHDR is correct there. + Locate NT_GNU_BUILD_ID from ABFD and return its content. */ -extern const struct bfd_build_id *build_id_bfd_get (bfd *abfd); +extern const struct bfd_build_id *build_id_bfd_shdr_get (bfd *abfd); /* Return true if ABFD has NT_GNU_BUILD_ID matching the CHECK value. Otherwise, issue a warning and return false. */ @@ -38,14 +39,19 @@ extern int build_id_verify (bfd *abfd, can be found, return NULL. */ extern gdb_bfd_ref_ptr build_id_to_debug_bfd (size_t build_id_len, - const bfd_byte *build_id); + const bfd_byte *build_id, + char **link_return = NULL); + +extern char *build_id_to_filename (const struct bfd_build_id *build_id, + char **link_return); /* Find and open a BFD for an executable file given a build-id. If no BFD can be found, return NULL. The returned reference to the BFD must be released by the caller. */ extern gdb_bfd_ref_ptr build_id_to_exec_bfd (size_t build_id_len, - const bfd_byte *build_id); + const bfd_byte *build_id, + char **link_return); /* Find the separate debug file for OBJFILE, by using the build-id associated with OBJFILE's BFD. If successful, returns the file name for the @@ -58,7 +64,8 @@ extern gdb_bfd_ref_ptr build_id_to_exec_bfd (size_t build_id_len, will be printed. */ extern std::string find_separate_debug_file_by_buildid - (struct objfile *objfile, deferred_warnings *warnings); + (struct objfile *objfile, deferred_warnings *warnings, + gdb::unique_xmalloc_ptr<char> *build_id_filename_return); /* Return an hex-string representation of BUILD_ID. */ diff --git a/gdb/coffread.c b/gdb/coffread.c --- a/gdb/coffread.c +++ b/gdb/coffread.c @@ -729,7 +729,7 @@ coff_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) { deferred_warnings warnings; std::string debugfile - = find_separate_debug_file_by_buildid (objfile, &warnings); + = find_separate_debug_file_by_buildid (objfile, &warnings, NULL); if (debugfile.empty ()) debugfile diff --git a/gdb/corelow.c b/gdb/corelow.c --- a/gdb/corelow.c +++ b/gdb/corelow.c @@ -22,6 +22,10 @@ #include <signal.h> #include <fcntl.h> #include "frame.h" +#include "auxv.h" +#include "build-id.h" +#include "elf/common.h" +#include "gdbcmd.h" #include "inferior.h" #include "infrun.h" #include "symtab.h" @@ -380,6 +384,8 @@ add_to_thread_list (asection *asect, asection *reg_sect, inferior *inf) switch_to_thread (thr); /* Yes, make it current. */ } +static bool build_id_core_loads = true; + /* Issue a message saying we have no core to debug, if FROM_TTY. */ static void @@ -563,12 +569,14 @@ rename_vmcore_idle_reg_sections (bfd *abfd, inferior *inf) static void locate_exec_from_corefile_build_id (bfd *abfd, int from_tty) { - const bfd_build_id *build_id = build_id_bfd_get (abfd); + const bfd_build_id *build_id = build_id_bfd_shdr_get (abfd); if (build_id == nullptr) return; + char *build_id_filename; gdb_bfd_ref_ptr execbfd - = build_id_to_exec_bfd (build_id->size, build_id->data); + = build_id_to_exec_bfd (build_id->size, build_id->data, + &build_id_filename); if (execbfd == nullptr) { @@ -596,7 +604,12 @@ locate_exec_from_corefile_build_id (bfd *abfd, int from_tty) exec_file_attach (bfd_get_filename (execbfd.get ()), from_tty); symbol_file_add_main (bfd_get_filename (execbfd.get ()), symfile_add_flag (from_tty ? SYMFILE_VERBOSE : 0)); + if (current_program_space->symfile_object_file != NULL) + current_program_space->symfile_object_file->flags |= + OBJF_BUILD_ID_CORE_LOADED; } + else + debug_print_missing (BUILD_ID_MAIN_EXECUTABLE_FILENAME, build_id_filename); } /* See gdbcore.h. */ @@ -1506,4 +1519,11 @@ _initialize_corelow () maintenance_print_core_file_backed_mappings, _("Print core file's file-backed mappings."), &maintenanceprintlist); + + add_setshow_boolean_cmd ("build-id-core-loads", class_files, + &build_id_core_loads, _("\ +Set whether CORE-FILE loads the build-id associated files automatically."), _("\ +Show whether CORE-FILE loads the build-id associated files automatically."), + NULL, NULL, NULL, + &setlist, &showlist); } diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -22296,6 +22296,27 @@ information files. @end table +You can also adjust the current verbosity of the @dfn{build id} locating. + +@table @code + +@kindex set build-id-verbose +@item set build-id-verbose 0 +No additional messages are printed. + +@item set build-id-verbose 1 +Missing separate debug filenames are printed. + +@item set build-id-verbose 2 +Missing separate debug filenames are printed and also all the parsing of the +binaries to find their @dfn{build id} content is printed. + +@kindex show build-id-verbose +@item show build-id-verbose +Show the current verbosity value for the @dfn{build id} content locating. + +@end table + @cindex @code{.gnu_debuglink} sections @cindex debug link sections A debug link is a special section of the executable file named diff --git a/gdb/dwarf2/index-cache.c b/gdb/dwarf2/index-cache.c --- a/gdb/dwarf2/index-cache.c +++ b/gdb/dwarf2/index-cache.c @@ -96,7 +96,7 @@ index_cache_store_context::index_cache_store_context (const index_cache &ic, return; /* Get build id of objfile. */ - const bfd_build_id *build_id = build_id_bfd_get (per_bfd->obfd); + const bfd_build_id *build_id = build_id_bfd_shdr_get (per_bfd->obfd); if (build_id == nullptr) { index_cache_debug ("objfile %s has no build id", @@ -111,7 +111,8 @@ index_cache_store_context::index_cache_store_context (const index_cache &ic, if (dwz != nullptr) { - const bfd_build_id *dwz_build_id = build_id_bfd_get (dwz->dwz_bfd.get ()); + const bfd_build_id *dwz_build_id + = build_id_bfd_shdr_get (dwz->dwz_bfd.get ()); if (dwz_build_id == nullptr) { diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c --- a/gdb/dwarf2/read.c +++ b/gdb/dwarf2/read.c @@ -3355,7 +3355,7 @@ get_gdb_index_contents_from_section (objfile *obj, T *section_owner) static gdb::array_view<const gdb_byte> get_gdb_index_contents_from_cache (objfile *obj, dwarf2_per_bfd *dwarf2_per_bfd) { - const bfd_build_id *build_id = build_id_bfd_get (obj->obfd.get ()); + const bfd_build_id *build_id = build_id_bfd_shdr_get (obj->obfd.get ()); if (build_id == nullptr) return {}; @@ -3368,7 +3368,7 @@ get_gdb_index_contents_from_cache (objfile *obj, dwarf2_per_bfd *dwarf2_per_bfd) static gdb::array_view<const gdb_byte> get_gdb_index_contents_from_cache_dwz (objfile *obj, dwz_file *dwz) { - const bfd_build_id *build_id = build_id_bfd_get (dwz->dwz_bfd.get ()); + const bfd_build_id *build_id = build_id_bfd_shdr_get (dwz->dwz_bfd.get ()); if (build_id == nullptr) return {}; diff --git a/gdb/elfread.c b/gdb/elfread.c --- a/gdb/elfread.c +++ b/gdb/elfread.c @@ -1220,8 +1220,10 @@ elf_symfile_read_dwarf2 (struct objfile *objfile, { deferred_warnings warnings; + gdb::unique_xmalloc_ptr<char> build_id_filename; std::string debugfile - = find_separate_debug_file_by_buildid (objfile, &warnings); + = find_separate_debug_file_by_buildid (objfile, &warnings, + &build_id_filename); if (debugfile.empty ()) debugfile = find_separate_debug_file_by_debuglink (objfile, &warnings); @@ -1239,7 +1241,7 @@ elf_symfile_read_dwarf2 (struct objfile *objfile, { has_dwarf2 = false; const struct bfd_build_id *build_id - = build_id_bfd_get (objfile->obfd.get ()); + = build_id_bfd_shdr_get (objfile->obfd.get ()); const char *filename = bfd_get_filename (objfile->obfd.get ()); if (build_id != nullptr) @@ -1265,6 +1267,11 @@ elf_symfile_read_dwarf2 (struct objfile *objfile, has_dwarf2 = true; } } + /* Check if any separate debug info has been extracted out. */ + else if (bfd_get_section_by_name (objfile->obfd.get (), + ".gnu_debuglink") + != NULL) + debug_print_missing (objfile_name (objfile), build_id_filename.get ()); } } /* If all the methods to collect the debuginfo failed, print the diff --git a/gdb/exec.c b/gdb/exec.c --- a/gdb/exec.c +++ b/gdb/exec.c @@ -237,7 +237,7 @@ validate_exec_file (int from_tty) current_exec_file = get_exec_file (0); const bfd_build_id *exec_file_build_id - = build_id_bfd_get (current_program_space->exec_bfd ()); + = build_id_bfd_shdr_get (current_program_space->exec_bfd ()); if (exec_file_build_id != nullptr) { /* Prepend the target prefix, to force gdb_bfd_open to open the @@ -250,7 +250,7 @@ validate_exec_file (int from_tty) if (abfd != nullptr) { const bfd_build_id *target_exec_file_build_id - = build_id_bfd_get (abfd.get ()); + = build_id_bfd_shdr_get (abfd.get ()); if (target_exec_file_build_id != nullptr) { diff --git a/gdb/objfiles.h b/gdb/objfiles.h --- a/gdb/objfiles.h +++ b/gdb/objfiles.h @@ -884,6 +884,10 @@ struct objfile bool object_format_has_copy_relocs = false; }; +/* This file was loaded according to the BUILD_ID_CORE_LOADS rules. */ + +#define OBJF_BUILD_ID_CORE_LOADED static_cast<enum objfile_flag>(1 << 12) + /* A deleter for objfile. */ struct objfile_deleter diff --git a/gdb/python/py-objfile.c b/gdb/python/py-objfile.c --- a/gdb/python/py-objfile.c +++ b/gdb/python/py-objfile.c @@ -158,7 +158,7 @@ objfpy_get_build_id (PyObject *self, void *closure) try { - build_id = build_id_bfd_get (objfile->obfd.get ()); + build_id = build_id_bfd_shdr_get (objfile->obfd.get ()); } catch (const gdb_exception &except) { @@ -629,7 +629,7 @@ gdbpy_lookup_objfile (PyObject *self, PyObject *args, PyObject *kw) if (obfd == nullptr) return 0; - const bfd_build_id *obfd_build_id = build_id_bfd_get (obfd); + const bfd_build_id *obfd_build_id = build_id_bfd_shdr_get (obfd); if (obfd_build_id == nullptr) return 0; diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c --- a/gdb/solib-svr4.c +++ b/gdb/solib-svr4.c @@ -44,6 +44,7 @@ #include "auxv.h" #include "gdb_bfd.h" #include "probe.h" +#include "build-id.h" #include <map> @@ -1318,9 +1319,51 @@ svr4_read_so_list (svr4_info *info, CORE_ADDR lm, CORE_ADDR prev_lm, continue; } - strncpy (newobj->so_name, buffer.get (), SO_NAME_MAX_PATH_SIZE - 1); - newobj->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; - strcpy (newobj->so_original_name, newobj->so_name); + { + struct bfd_build_id *build_id; + + strncpy (newobj->so_original_name, buffer.get (), SO_NAME_MAX_PATH_SIZE - 1); + newobj->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; + /* May get overwritten below. */ + strcpy (newobj->so_name, newobj->so_original_name); + + build_id = build_id_addr_get (((lm_info_svr4 *) newobj->lm_info)->l_ld); + if (build_id != NULL) + { + char *name, *build_id_filename; + + /* Missing the build-id matching separate debug info file + would be handled while SO_NAME gets loaded. */ + name = build_id_to_filename (build_id, &build_id_filename); + if (name != NULL) + { + strncpy (newobj->so_name, name, SO_NAME_MAX_PATH_SIZE - 1); + newobj->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; + xfree (name); + } + else + { + debug_print_missing (newobj->so_name, build_id_filename); + + /* In the case the main executable was found according to + its build-id (from a core file) prevent loading + a different build of a library with accidentally the + same SO_NAME. + + It suppresses bogus backtraces (and prints "??" there + instead) if the on-disk files no longer match the + running program version. */ + + if (current_program_space->symfile_object_file != NULL + && (current_program_space->symfile_object_file->flags + & OBJF_BUILD_ID_CORE_LOADED) != 0) + newobj->so_name[0] = 0; + } + + xfree (build_id_filename); + xfree (build_id); + } + } /* If this entry has no name, or its name matches the name for the main executable, don't include it in the list. */ diff --git a/gdb/source.c b/gdb/source.c --- a/gdb/source.c +++ b/gdb/source.c @@ -1167,7 +1167,7 @@ open_source_file (struct symtab *s) } const struct bfd_build_id *build_id - = build_id_bfd_get (ofp->obfd.get ()); + = build_id_bfd_shdr_get (ofp->obfd.get ()); /* Query debuginfod for the source file. */ if (build_id != nullptr && !srcpath.empty ()) diff --git a/gdb/symfile.h b/gdb/symfile.h --- a/gdb/symfile.h +++ b/gdb/symfile.h @@ -357,12 +357,18 @@ bool expand_symtabs_matching void map_symbol_filenames (gdb::function_view<symbol_filename_ftype> fun, bool need_fullname); + /* Target-agnostic function to load the sections of an executable into memory. ARGS should be in the form "EXECUTABLE [OFFSET]", where OFFSET is an optional offset to apply to each section. */ extern void generic_load (const char *args, int from_tty); +/* build-id support. */ +extern struct bfd_build_id *build_id_addr_get (CORE_ADDR addr); +extern void debug_print_missing (const char *binary, const char *debug); +#define BUILD_ID_MAIN_EXECUTABLE_FILENAME _("the main executable file") + /* From minidebug.c. */ extern gdb_bfd_ref_ptr find_separate_debug_file_in_section (struct objfile *); diff --git a/gdb/testsuite/gdb.base/corefile.exp b/gdb/testsuite/gdb.base/corefile.exp --- a/gdb/testsuite/gdb.base/corefile.exp +++ b/gdb/testsuite/gdb.base/corefile.exp @@ -347,3 +347,33 @@ gdb_test_multiple "core-file $corefile" $test { pass $test } } + + +# Test auto-loading of binary files through build-id from the core file. +set buildid [build_id_debug_filename_get $binfile] +set wholetest "binfile found by build-id" +if {$buildid == ""} { + untested "$wholetest (binary has no build-id)" +} else { + gdb_exit + gdb_start + + regsub {\.debug$} $buildid {} buildid + set debugdir [standard_output_file ${testfile}-debugdir] + file delete -force -- $debugdir + file mkdir $debugdir/[file dirname $buildid] + file copy $binfile $debugdir/$buildid + + set test "show debug-file-directory" + gdb_test_multiple $test $test { + -re "The directory where separate debug symbols are searched for is \"(.*)\"\\.\r\n$gdb_prompt $" { + set debugdir_orig $expect_out(1,string) + pass $test + } + } + gdb_test_no_output "set debug-file-directory $debugdir:$debugdir_orig" "set debug-file-directory" + gdb_test "show build-id-core-loads" {Whether CORE-FILE loads the build-id associated files automatically is on\.} + gdb_test "core-file $corefile" "\r\nProgram terminated with .*" "core-file without executable" + gdb_test "info files" "Local exec file:\r\n\[ \t\]*`[string_to_regexp $debugdir/$buildid]', file type .*" + pass $wholetest +} diff --git a/gdb/testsuite/gdb.base/gdbinit-history.exp b/gdb/testsuite/gdb.base/gdbinit-history.exp --- a/gdb/testsuite/gdb.base/gdbinit-history.exp +++ b/gdb/testsuite/gdb.base/gdbinit-history.exp @@ -179,7 +179,8 @@ proc test_empty_history_filename { } { global env global gdb_prompt - set common_history [list "set height 0" "set width 0"] + set common_history [list "set height 0" "set width 0" \ + "set build-id-verbose 0"] set test_dir [standard_output_file history_test] remote_exec host "mkdir -p $test_dir" diff --git a/gdb/testsuite/gdb.base/new-ui-pending-input.exp b/gdb/testsuite/gdb.base/new-ui-pending-input.exp --- a/gdb/testsuite/gdb.base/new-ui-pending-input.exp +++ b/gdb/testsuite/gdb.base/new-ui-pending-input.exp @@ -62,6 +62,7 @@ proc test_command_line_new_ui_pending_input {} { set options "" append options " -iex \"set height 0\"" append options " -iex \"set width 0\"" + append options " -iex \"set build-id-verbose 0\"" append options " -iex \"new-ui console $extra_tty_name\"" append options " -ex \"b $bpline\"" append options " -ex \"run\"" diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp --- a/gdb/testsuite/lib/gdb.exp +++ b/gdb/testsuite/lib/gdb.exp @@ -226,7 +226,8 @@ if ![info exists INTERNAL_GDBFLAGS] { "-nx" \ "-q" \ {-iex "set height 0"} \ - {-iex "set width 0"}]] + {-iex "set width 0"} \ + {-iex "set build-id-verbose 0"}]] # If DEBUGINFOD_URLS is set, gdb will try to download sources and # debug info for f.i. system libraries. Prevent this. @@ -2434,6 +2435,17 @@ proc default_gdb_start { } { } } + # Turn off the missing warnings as the testsuite does not expect it. + send_gdb "set build-id-verbose 0\n" + gdb_expect 10 { + -re "$gdb_prompt $" { + verbose "Disabled the missing debug infos warnings." 2 + } + timeout { + warning "Could not disable the missing debug infos warnings.." + } + } + gdb_debug_init return 0 } diff --git a/gdb/testsuite/lib/mi-support.exp b/gdb/testsuite/lib/mi-support.exp --- a/gdb/testsuite/lib/mi-support.exp +++ b/gdb/testsuite/lib/mi-support.exp @@ -321,6 +321,16 @@ proc default_mi_gdb_start { { flags {} } } { warning "Couldn't set the width to 0." } } + # Turn off the missing warnings as the testsuite does not expect it. + send_gdb "190-gdb-set build-id-verbose 0\n" + gdb_expect 10 { + -re ".*190-gdb-set build-id-verbose 0\r\n190\\\^done\r\n$mi_gdb_prompt$" { + verbose "Disabled the missing debug infos warnings." 2 + } + timeout { + warning "Could not disable the missing debug infos warnings.." + } + } if { $separate_inferior_pty } { mi_create_inferior_pty
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