X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=bfd%2Felfcore.h;h=cd218066dc494172be11ac319b1d9a9b2e553b4a;hb=e901de89515172c86d710e23ea506f9365c42a1d;hp=ab8b79fe132b017822b6b47c52ce4496eb30d2ca;hpb=fa803dc60f0bf01297674c41d001798e18ade4dc;p=deliverable%2Fbinutils-gdb.git diff --git a/bfd/elfcore.h b/bfd/elfcore.h index ab8b79fe13..cd218066dc 100644 --- a/bfd/elfcore.h +++ b/bfd/elfcore.h @@ -1,373 +1,65 @@ /* ELF core file support for BFD. - Copyright (C) 1995, 1996 Free Software Foundation, Inc. + Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003 + Free Software Foundation, Inc. -This file is part of BFD, the Binary File Descriptor library. + This file is part of BFD, the Binary File Descriptor library. -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -/* Core file support */ + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -#ifdef HAVE_SYS_PROCFS_H /* Some core file support requires host /proc files */ -#include -#include - -/* Solaris includes the field pr_who that indicates the thread number within - the process. */ - -#ifdef PIOCOPENLWP -#define get_thread(STATUS) ((((prstatus_t *)(STATUS))->pr_who << 16) \ - | ((prstatus_t *)(STATUS))->pr_pid) -#else -#define get_thread(STATUS) (((prstatus_t *)(STATUS))->pr_pid) -#endif -#else -#define bfd_prstatus(abfd, descdata, descsz, filepos) true -#define bfd_fpregset(abfd, descdata, descsz, filepos) true -#define bfd_prpsinfo(abfd, descdata, descsz, filepos) true -#define get_thread(STATUS) (1) -#endif - -#ifdef HAVE_SYS_PROCFS_H - -static int did_reg; -static int did_reg2; - -static boolean -bfd_prstatus (abfd, descdata, descsz, filepos, thread) - bfd *abfd; - char *descdata; - int descsz; - long filepos; - int thread; -{ - asection *newsect; - prstatus_t *status = (prstatus_t *) 0; - - if (descsz == sizeof (prstatus_t)) - { - char secname[100]; - char *p; - - sprintf (secname, ".reg/%d", thread); - p = bfd_alloc (abfd, strlen (secname) + 1); - if (!p) - return false; - strcpy (p, secname); - - newsect = bfd_make_section (abfd, p); - if (newsect == NULL) - return false; - newsect->_raw_size = sizeof (status->pr_reg); - newsect->filepos = filepos + (long) &status->pr_reg; - newsect->flags = SEC_HAS_CONTENTS; - newsect->alignment_power = 2; - if ((core_prstatus (abfd) = bfd_alloc (abfd, descsz)) != NULL) - { - memcpy (core_prstatus (abfd), descdata, descsz); - } - - if (!did_reg++) - { - asection *regsect; - - regsect = bfd_make_section (abfd, ".reg"); - if (regsect == NULL) - return false; - regsect->_raw_size = newsect->_raw_size; - regsect->filepos = newsect->filepos; - regsect->flags = newsect->flags; - regsect->alignment_power = newsect->alignment_power; - } - } - return true; -} - -/* Stash a copy of the prpsinfo structure away for future use. */ - -static boolean -bfd_prpsinfo (abfd, descdata, descsz, filepos) - bfd *abfd; - char *descdata; - int descsz; - long filepos; -{ - if (descsz == sizeof (prpsinfo_t)) - { - if ((core_prpsinfo (abfd) = bfd_alloc (abfd, descsz)) == NULL) - return false; - memcpy (core_prpsinfo (abfd), descdata, descsz); - } - return true; -} - -static boolean -bfd_fpregset (abfd, descdata, descsz, filepos, thread) - bfd *abfd; - char *descdata; - int descsz; - long filepos; - int thread; -{ - asection *newsect; - char secname[100]; - char *p; - - sprintf (secname, ".reg2/%d", thread); - p = bfd_alloc (abfd, strlen (secname) + 1); - if (!p) - return false; - strcpy (p, secname); - - newsect = bfd_make_section (abfd, p); - if (newsect == NULL) - return false; - newsect->_raw_size = descsz; - newsect->filepos = filepos; - newsect->flags = SEC_HAS_CONTENTS; - newsect->alignment_power = 2; - - if (!did_reg2++) - { - asection *regsect; - - regsect = bfd_make_section (abfd, ".reg2"); - if (regsect == NULL) - return false; - regsect->_raw_size = newsect->_raw_size; - regsect->filepos = newsect->filepos; - regsect->flags = newsect->flags; - regsect->alignment_power = newsect->alignment_power; - } - - return true; -} - -#endif /* HAVE_SYS_PROCFS_H */ - -/* Return a pointer to the args (including the command name) that were - seen by the program that generated the core dump. Note that for - some reason, a spurious space is tacked onto the end of the args - in some (at least one anyway) implementations, so strip it off if - it exists. */ - -char * +char* elf_core_file_failing_command (abfd) bfd *abfd; { -#ifdef HAVE_SYS_PROCFS_H - if (core_prpsinfo (abfd)) - { - prpsinfo_t *p = core_prpsinfo (abfd); - char *scan = p->pr_psargs; - while (*scan++) - {; - } - scan -= 2; - if ((scan > p->pr_psargs) && (*scan == ' ')) - { - *scan = '\000'; - } - return p->pr_psargs; - } -#endif - return NULL; + return elf_tdata (abfd)->core_command; } -/* Return the number of the signal that caused the core dump. Presumably, - since we have a core file, we got a signal of some kind, so don't bother - checking the other process status fields, just return the signal number. - */ - int elf_core_file_failing_signal (abfd) bfd *abfd; { -#ifdef HAVE_SYS_PROCFS_H - if (core_prstatus (abfd)) - { - return ((prstatus_t *) (core_prstatus (abfd)))->pr_cursig; - } -#endif - return -1; + return elf_tdata (abfd)->core_signal; } -/* Check to see if the core file could reasonably be expected to have - come for the current executable file. Note that by default we return - true unless we find something that indicates that there might be a - problem. - */ - -boolean +bfd_boolean elf_core_file_matches_executable_p (core_bfd, exec_bfd) bfd *core_bfd; bfd *exec_bfd; { -#ifdef HAVE_SYS_PROCFS_H - char *corename; - char *execname; -#endif + char* corename; - /* First, xvecs must match since both are ELF files for the same target. */ + /* xvecs must match if both are ELF files for the same target. */ if (core_bfd->xvec != exec_bfd->xvec) { bfd_set_error (bfd_error_system_call); - return false; - } - -#ifdef HAVE_SYS_PROCFS_H - - /* If no prpsinfo, just return true. Otherwise, grab the last component - of the exec'd pathname from the prpsinfo. */ - - if (core_prpsinfo (core_bfd)) - { - corename = (((prpsinfo_t *) core_prpsinfo (core_bfd))->pr_fname); - } - else - { - return true; + return FALSE; } - /* Find the last component of the executable pathname. */ - - if ((execname = strrchr (exec_bfd->filename, '/')) != NULL) - { - execname++; - } - else + /* See if the name in the corefile matches the executable name. */ + corename = elf_tdata (core_bfd)->core_program; + if (corename != NULL) { - execname = (char *) exec_bfd->filename; - } - - /* See if they match */ - - return strcmp (execname, corename) ? false : true; + const char* execname = strrchr (exec_bfd->filename, '/'); -#else + execname = execname ? execname + 1 : exec_bfd->filename; - return true; - -#endif /* HAVE_SYS_PROCFS_H */ -} - -/* ELF core files contain a segment of type PT_NOTE, that holds much of - the information that would normally be available from the /proc interface - for the process, at the time the process dumped core. Currently this - includes copies of the prstatus, prpsinfo, and fpregset structures. - - Since these structures are potentially machine dependent in size and - ordering, bfd provides two levels of support for them. The first level, - available on all machines since it does not require that the host - have /proc support or the relevant include files, is to create a bfd - section for each of the prstatus, prpsinfo, and fpregset structures, - without any interpretation of their contents. With just this support, - the bfd client will have to interpret the structures itself. Even with - /proc support, it might want these full structures for it's own reasons. - - In the second level of support, where HAVE_SYS_PROCFS_H is defined, - bfd will pick apart the structures to gather some additional - information that clients may want, such as the general register - set, the name of the exec'ed file and its arguments, the signal (if - any) that caused the core dump, etc. - - */ - -static boolean -elf_corefile_note (abfd, hdr) - bfd *abfd; - Elf_Internal_Phdr *hdr; -{ - Elf_External_Note *x_note_p; /* Elf note, external form */ - Elf_Internal_Note i_note; /* Elf note, internal form */ - char *buf = NULL; /* Entire note segment contents */ - char *namedata; /* Name portion of the note */ - char *descdata; /* Descriptor portion of the note */ - char *sectname; /* Name to use for new section */ - long filepos; /* File offset to descriptor data */ - asection *newsect; - int thread = 1; /* Current thread number */ - - did_reg = 0; /* Non-zero if we made .reg section */ - did_reg2 = 0; /* Ditto for .reg2 */ - - if (hdr->p_filesz > 0 - && (buf = (char *) bfd_malloc ((size_t) hdr->p_filesz)) != NULL - && bfd_seek (abfd, hdr->p_offset, SEEK_SET) != -1 - && bfd_read ((PTR) buf, hdr->p_filesz, 1, abfd) == hdr->p_filesz) - { - x_note_p = (Elf_External_Note *) buf; - while ((char *) x_note_p < (buf + hdr->p_filesz)) - { - i_note.namesz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->namesz); - i_note.descsz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->descsz); - i_note.type = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p->type); - namedata = x_note_p->name; - descdata = namedata + BFD_ALIGN (i_note.namesz, 4); - filepos = hdr->p_offset + (descdata - buf); - switch (i_note.type) - { - case NT_PRSTATUS: - /* process descdata as prstatus info */ - thread = get_thread (descdata); - if (! bfd_prstatus (abfd, descdata, i_note.descsz, filepos, - thread)) - return false; - sectname = NULL; - break; - case NT_FPREGSET: - /* process descdata as fpregset info */ - if (! bfd_fpregset (abfd, descdata, i_note.descsz, filepos, - thread)) - return false; - sectname = NULL; - break; - case NT_PRPSINFO: - /* process descdata as prpsinfo */ - if (! bfd_prpsinfo (abfd, descdata, i_note.descsz, filepos)) - return false; - sectname = ".prpsinfo"; - break; - default: - /* Unknown descriptor, just ignore it. */ - sectname = NULL; - break; - } - if (sectname != NULL) - { - newsect = bfd_make_section (abfd, sectname); - if (newsect == NULL) - return false; - newsect->_raw_size = i_note.descsz; - newsect->filepos = filepos; - newsect->flags = SEC_ALLOC | SEC_HAS_CONTENTS; - newsect->alignment_power = 2; - } - x_note_p = (Elf_External_Note *) - (descdata + BFD_ALIGN (i_note.descsz, 4)); - } - } - if (buf != NULL) - { - free (buf); + if (strcmp(execname, corename) != 0) + return FALSE; } - else if (hdr->p_filesz > 0) - { - return false; - } - return true; + return TRUE; } /* Core files are simply standard ELF formatted files that partition @@ -379,86 +71,69 @@ elf_corefile_note (abfd, hdr) register set) and the floating point register set are stored in a segment of type PT_NOTE. We handcraft a couple of extra bfd sections that allow standard bfd access to the general registers (.reg) and the - floating point registers (.reg2). - - */ + floating point registers (.reg2). */ const bfd_target * elf_core_file_p (abfd) bfd *abfd; { - Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ - Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ - Elf_External_Phdr x_phdr; /* Program header table entry, external form */ - Elf_Internal_Phdr *i_phdrp; /* Program header table, internal form */ + Elf_External_Ehdr x_ehdr; /* Elf file header, external form. */ + Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form. */ + Elf_Internal_Phdr *i_phdrp; /* Elf program header, internal form. */ unsigned int phindex; struct elf_backend_data *ebd; + struct bfd_preserve preserve; + bfd_size_type amt; - /* Read in the ELF header in external format. */ + preserve.marker = NULL; - if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr)) + /* Read in the ELF header in external format. */ + if (bfd_bread ((PTR) &x_ehdr, (bfd_size_type) sizeof (x_ehdr), abfd) + != sizeof (x_ehdr)) { if (bfd_get_error () != bfd_error_system_call) - bfd_set_error (bfd_error_wrong_format); - 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, and it must have a - program header table (FIXME: See comments re segments at top of this - file). */ - - if (elf_file_p (&x_ehdr) == false) - { - wrong: - bfd_set_error (bfd_error_wrong_format); - return NULL; + goto wrong; + else + goto fail; } - /* FIXME, Check EI_VERSION here ! */ + /* Check the magic number. */ + if (! elf_file_p (&x_ehdr)) + goto wrong; - { -#if ARCH_SIZE == 32 - int desired_address_size = ELFCLASS32; -#endif -#if ARCH_SIZE == 64 - int desired_address_size = ELFCLASS64; -#endif + /* FIXME: Check EI_VERSION here ! */ - if (x_ehdr.e_ident[EI_CLASS] != desired_address_size) - goto wrong; - } + /* Check the address size ("class"). */ + if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) + goto wrong; - /* Switch xvec to match the specified byte order. */ + /* Check the byteorder. */ switch (x_ehdr.e_ident[EI_DATA]) { - case ELFDATA2MSB: /* Big-endian */ + case ELFDATA2MSB: /* Big-endian. */ if (! bfd_big_endian (abfd)) goto wrong; break; - case ELFDATA2LSB: /* Little-endian */ + case ELFDATA2LSB: /* Little-endian. */ if (! bfd_little_endian (abfd)) goto wrong; break; - case ELFDATANONE: /* No data encoding specified */ - default: /* Unknown data encoding specified */ + default: goto wrong; } - /* Allocate an instance of the elf_obj_tdata structure and hook it up to - the tdata pointer in the bfd. */ + if (!bfd_preserve_save (abfd, &preserve)) + goto fail; - elf_tdata (abfd) = - (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)); - if (elf_tdata (abfd) == NULL) - return NULL; + /* Give abfd an elf_obj_tdata. */ + if (! (*abfd->xvec->_bfd_set_format[bfd_core]) (abfd)) + goto fail; + preserve.marker = elf_tdata (abfd); - /* FIXME, `wrong' returns from this point onward, leak memory. */ - - /* Now that we know the byte order, swap in the rest of the header */ + /* Swap in the rest of the header, now that we have the byte order. */ i_ehdrp = elf_elfheader (abfd); elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); + #if DEBUG & 1 elf_debug_file (i_ehdrp); #endif @@ -467,9 +142,12 @@ elf_core_file_p (abfd) /* Check that the ELF e_machine field matches what this particular BFD format expects. */ + if (ebd->elf_machine_code != i_ehdrp->e_machine - && (ebd->elf_machine_alt1 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt1) - && (ebd->elf_machine_alt2 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt2)) + && (ebd->elf_machine_alt1 == 0 + || i_ehdrp->e_machine != ebd->elf_machine_alt1) + && (ebd->elf_machine_alt2 == 0 + || i_ehdrp->e_machine != ebd->elf_machine_alt2)) { const bfd_target * const *target_ptr; @@ -478,6 +156,7 @@ elf_core_file_p (abfd) /* This is the generic ELF target. Let it match any ELF target for which we do not have a specific backend. */ + for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) { struct elf_backend_data *back; @@ -485,7 +164,11 @@ elf_core_file_p (abfd) if ((*target_ptr)->flavour != bfd_target_elf_flavour) continue; back = (struct elf_backend_data *) (*target_ptr)->backend_data; - if (back->elf_machine_code == i_ehdrp->e_machine) + if (back->elf_machine_code == i_ehdrp->e_machine + || (back->elf_machine_alt1 != 0 + && i_ehdrp->e_machine == back->elf_machine_alt1) + || (back->elf_machine_alt2 != 0 + && i_ehdrp->e_machine == back->elf_machine_alt2)) { /* target_ptr is an ELF backend which matches this object file, so reject the generic ELF target. */ @@ -495,48 +178,80 @@ elf_core_file_p (abfd) } /* If there is no program header, or the type is not a core file, then - we are hosed. */ + we are hosed. */ if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) goto wrong; - /* Allocate space for a copy of the program header table in - internal form, seek to the program header table in the file, - read it in, and convert it to internal form. As a simple sanity - check, verify that the what BFD thinks is the size of each program - header table entry actually matches the size recorded in the file. */ + /* Does BFD's idea of the phdr size match the size + recorded in the file? */ + if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr)) + goto wrong; - if (i_ehdrp->e_phentsize != sizeof (x_phdr)) + /* Move to the start of the program headers. */ + if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) goto wrong; - i_phdrp = (Elf_Internal_Phdr *) - bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum); + + /* Allocate space for the program headers. */ + amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum; + i_phdrp = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); if (!i_phdrp) - return NULL; - if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) == -1) - return NULL; - for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++) + goto fail; + + elf_tdata (abfd)->phdr = i_phdrp; + + /* Read and convert to internal form. */ + for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) { - if (bfd_read ((PTR) & x_phdr, sizeof (x_phdr), 1, abfd) + Elf_External_Phdr x_phdr; + + if (bfd_bread ((PTR) &x_phdr, (bfd_size_type) sizeof (x_phdr), abfd) != sizeof (x_phdr)) - return NULL; + goto fail; + elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); } - /* Once all of the program headers have been read and converted, we - can start processing them. */ - - for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++) + /* Set the machine architecture. Do this before processing the + program headers since we need to know the architecture type + when processing the notes of some systems' core files. */ + if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) { - bfd_section_from_phdr (abfd, i_phdrp + phindex, phindex); - if ((i_phdrp + phindex)->p_type == PT_NOTE) - { - if (! elf_corefile_note (abfd, i_phdrp + phindex)) - return NULL; - } + /* It's OK if this fails for the generic target. */ + if (ebd->elf_machine_code != EM_NONE) + goto fail; } - /* Remember the entry point specified in the ELF file header. */ + /* Process each program header. */ + for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) + if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex)) + goto fail; + /* Save the entry point from the ELF header. */ bfd_get_start_address (abfd) = i_ehdrp->e_entry; + /* Let the backend double check the format and override global + information. */ + if (ebd->elf_backend_object_p + && (! (*ebd->elf_backend_object_p) (abfd))) + goto wrong; + + bfd_preserve_finish (abfd, &preserve); return abfd->xvec; + +wrong: + /* There is way too much undoing of half-known state here. The caller, + bfd_check_format_matches, really shouldn't iterate on live bfd's to + check match/no-match like it does. We have to rely on that a call to + bfd_default_set_arch_mach with the previously known mach, undoes what + was done by the first bfd_default_set_arch_mach (with mach 0) here. + For this to work, only elf-data and the mach may be changed by the + target-specific elf_backend_object_p function. Note that saving the + whole bfd here and restoring it would be even worse; the first thing + you notice is that the cached bfd file position gets out of sync. */ + bfd_set_error (bfd_error_wrong_format); + +fail: + if (preserve.marker != NULL) + bfd_preserve_restore (abfd, &preserve); + return NULL; }