-/* Core file support */
-
-#ifdef HAVE_PROCFS /* Some core file support requires host /proc files */
-#include <sys/procfs.h>
-#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
-#endif
+/* ELF core file support for BFD.
+ Copyright (C) 1995-2021 Free Software Foundation, Inc.
-#ifdef HAVE_PROCFS
+ This file is part of BFD, the Binary File Descriptor library.
-static boolean
-bfd_prstatus (abfd, descdata, descsz, filepos)
- bfd *abfd;
- char *descdata;
- int descsz;
- long filepos;
-{
- asection *newsect;
- prstatus_t *status = (prstatus_t *) 0;
+ 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 3 of the License, or
+ (at your option) any later version.
- if (descsz == sizeof (prstatus_t))
- {
- newsect = bfd_make_section (abfd, ".reg");
- 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);
- }
- }
- return true;
-}
+ 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.
-/* Stash a copy of the prpsinfo structure away for future use. */
+ 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., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
-static boolean
-bfd_prpsinfo (abfd, descdata, descsz, filepos)
- bfd *abfd;
- char *descdata;
- int descsz;
- long filepos;
+char*
+elf_core_file_failing_command (bfd *abfd)
{
- if (descsz == sizeof (prpsinfo_t))
- {
- if ((core_prpsinfo (abfd) = bfd_alloc (abfd, descsz)) == NULL)
- {
- bfd_set_error (bfd_error_no_memory);
- return false;
- }
- memcpy (core_prpsinfo (abfd), descdata, descsz);
- }
- return true;
+ return elf_tdata (abfd)->core->command;
}
-static boolean
-bfd_fpregset (abfd, descdata, descsz, filepos)
- bfd *abfd;
- char *descdata;
- int descsz;
- long filepos;
+int
+elf_core_file_failing_signal (bfd *abfd)
{
- asection *newsect;
-
- newsect = bfd_make_section (abfd, ".reg2");
- if (newsect == NULL)
- return false;
- newsect->_raw_size = descsz;
- newsect->filepos = filepos;
- newsect->flags = SEC_HAS_CONTENTS;
- newsect->alignment_power = 2;
- return true;
+ return elf_tdata (abfd)->core->signal;
}
-#endif /* HAVE_PROCFS */
-
-/* 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 *
-elf_core_file_failing_command (abfd)
- bfd *abfd;
-{
-#ifdef HAVE_PROCFS
- 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 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;
+elf_core_file_pid (bfd *abfd)
{
-#ifdef HAVE_PROCFS
- if (core_prstatus (abfd))
- {
- return ((prstatus_t *) (core_prstatus (abfd)))->pr_cursig;
- }
-#endif
- return -1;
+ return elf_tdata (abfd)->core->pid;
}
-/* 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
-elf_core_file_matches_executable_p (core_bfd, exec_bfd)
- bfd *core_bfd;
- bfd *exec_bfd;
+bfd_boolean
+elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
{
-#ifdef HAVE_PROCFS
- 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_PROCFS
-
- /* 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
+ /* If both BFDs have identical build-ids, then they match. */
+ if (core_bfd->build_id != NULL
+ && exec_bfd->build_id != NULL
+ && core_bfd->build_id->size == exec_bfd->build_id->size
+ && memcmp (core_bfd->build_id->data, exec_bfd->build_id->data,
+ core_bfd->build_id->size) == 0)
+ return TRUE;
+
+ /* 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 */
+ const char* execname = strrchr (bfd_get_filename (exec_bfd), '/');
- return strcmp (execname, corename) ? false : true;
+ execname = execname ? execname + 1 : bfd_get_filename (exec_bfd);
-#else
-
- return true;
-
-#endif /* HAVE_PROCFS */
-}
-
-/* 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_PROCFS 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;
-
- if (hdr->p_filesz > 0
- && (buf = (char *) malloc (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 */
- if (! bfd_prstatus (abfd, descdata, i_note.descsz, filepos))
- return false;
- sectname = ".prstatus";
- break;
- case NT_FPREGSET:
- /* process descdata as fpregset info */
- if (! bfd_fpregset (abfd, descdata, i_note.descsz, filepos))
- return false;
- sectname = ".fpregset";
- 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)
- {
- bfd_set_error (bfd_error_no_memory);
- return false;
- }
- return true;
+ return TRUE;
}
/* Core files are simply standard ELF formatted files that partition
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;
+bfd_cleanup
+elf_core_file_p (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;
+ const struct elf_backend_data *ebd;
+ bfd_size_type amt;
/* Read in the ELF header in external format. */
-
- if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr))
+ if (bfd_bread (&x_ehdr, 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 */
- if (abfd->xvec->byteorder_big_p == false)
+ case ELFDATA2MSB: /* Big-endian. */
+ if (! bfd_big_endian (abfd))
goto wrong;
break;
- case ELFDATA2LSB: /* Little-endian */
- if (abfd->xvec->byteorder_big_p == true)
+ 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. */
-
- elf_tdata (abfd) =
- (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata));
- if (elf_tdata (abfd) == NULL)
- {
- bfd_set_error (bfd_error_no_memory);
- return NULL;
- }
-
- /* FIXME, `wrong' returns from this point onward, leak memory. */
+ /* Give abfd an elf_obj_tdata. */
+ if (! (*abfd->xvec->_bfd_set_format[bfd_core]) (abfd))
+ goto fail;
- /* 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
/* 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;
/* 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;
+ const struct elf_backend_data *back;
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)
+ back = xvec_get_elf_backend_data (*target_ptr);
+ if (back->s->arch_size != ARCH_SIZE)
+ continue;
+ 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. */
}
/* 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))
+ /* If the program header count is PN_XNUM(0xffff), the actual
+ count is in the first section header. */
+ if (i_ehdrp->e_shoff != 0 && i_ehdrp->e_phnum == PN_XNUM)
+ {
+ Elf_External_Shdr x_shdr;
+ Elf_Internal_Shdr i_shdr;
+ file_ptr where = (file_ptr) i_ehdrp->e_shoff;
+
+ /* Seek to the section header table in the file. */
+ if (bfd_seek (abfd, where, SEEK_SET) != 0)
+ goto fail;
+
+ /* Read the first section header at index 0, and convert to internal
+ form. */
+ if (bfd_bread (&x_shdr, sizeof (x_shdr), abfd) != sizeof (x_shdr))
+ goto fail;
+ elf_swap_shdr_in (abfd, &x_shdr, &i_shdr);
+
+ if (i_shdr.sh_info != 0)
+ {
+ i_ehdrp->e_phnum = i_shdr.sh_info;
+ if (i_ehdrp->e_phnum != i_shdr.sh_info)
+ goto wrong;
+ }
+ }
+
+ /* Sanity check that we can read all of the program headers.
+ It ought to be good enough to just read the last one. */
+ if (i_ehdrp->e_phnum > 1)
+ {
+ Elf_External_Phdr x_phdr;
+ Elf_Internal_Phdr i_phdr;
+ file_ptr where;
+
+ /* Check that we don't have a totally silly number of
+ program headers. */
+ if (i_ehdrp->e_phnum > (unsigned int) -1 / sizeof (x_phdr)
+ || i_ehdrp->e_phnum > (unsigned int) -1 / sizeof (i_phdr))
+ goto wrong;
+
+ where = (file_ptr)(i_ehdrp->e_phoff + (i_ehdrp->e_phnum - 1) * sizeof (x_phdr));
+ if ((bfd_size_type) where <= i_ehdrp->e_phoff)
+ goto wrong;
+
+ if (bfd_seek (abfd, where, SEEK_SET) != 0)
+ goto fail;
+ if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr))
+ goto fail;
+ }
+
+ /* 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)
+ goto fail;
+
+ elf_tdata (abfd)->phdr = i_phdrp;
+
+ /* Read and convert to internal form. */
+ for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
{
- bfd_set_error (bfd_error_no_memory);
- return NULL;
+ Elf_External_Phdr x_phdr;
+
+ if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr))
+ goto fail;
+
+ elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex);
}
- if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) == -1)
- return NULL;
- 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)
+ /* It's OK if this fails for the generic target. */
+ && ebd->elf_machine_code != EM_NONE)
+ goto fail;
+
+ /* Let the backend double check the format and override global
+ information. We do this before processing the program headers
+ to allow the correct machine (as opposed to just the default
+ machine) to be set, making it possible for grok_prstatus and
+ grok_psinfo to rely on the mach setting. */
+ if (ebd->elf_backend_object_p != NULL
+ && ! ebd->elf_backend_object_p (abfd))
+ goto wrong;
+
+ /* 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;
+
+ /* Check for core truncation. */
+ {
+ bfd_size_type high = 0;
+ struct stat statbuf;
+ for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex)
+ {
+ Elf_Internal_Phdr *p = i_phdrp + phindex;
+ if (p->p_filesz)
+ {
+ bfd_size_type current = p->p_offset + p->p_filesz;
+ if (high < current)
+ high = current;
+ }
+ }
+ if (bfd_stat (abfd, &statbuf) == 0)
+ {
+ if ((bfd_size_type) statbuf.st_size < high)
+ {
+ _bfd_error_handler
+ /* xgettext:c-format */
+ (_("warning: %pB is truncated: expected core file "
+ "size >= %" PRIu64 ", found: %" PRIu64),
+ abfd, (uint64_t) high, (uint64_t) statbuf.st_size);
+ }
+ }
+ }
+
+ /* Save the entry point from the ELF header. */
+ abfd->start_address = i_ehdrp->e_entry;
+ return _bfd_no_cleanup;
+
+ wrong:
+ bfd_set_error (bfd_error_wrong_format);
+ fail:
+ return NULL;
+}
+
+/* Attempt to find a build-id in a core file from the core file BFD.
+ OFFSET is the file offset to a PT_LOAD segment that may contain
+ the build-id note. Returns TRUE upon success, FALSE otherwise. */
+
+bfd_boolean
+NAME(_bfd_elf, core_find_build_id)
+ (bfd *abfd,
+ bfd_vma offset)
+{
+ Elf_External_Ehdr x_ehdr; /* Elf file header, external form. */
+ Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form. */
+ Elf_Internal_Phdr *i_phdr;
+ unsigned int i;
+ size_t amt;
+
+ /* Seek to the position of the segment at OFFSET. */
+ if (bfd_seek (abfd, offset, SEEK_SET) != 0)
+ goto fail;
+
+ /* Read in the ELF header in external format. */
+ if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr))
{
- if (bfd_read ((PTR) & x_phdr, sizeof (x_phdr), 1, abfd)
- != sizeof (x_phdr))
- return NULL;
- elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex);
+ if (bfd_get_error () != bfd_error_system_call)
+ goto wrong;
+ else
+ goto fail;
+ }
+
+ /* 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
+ section header table (FIXME: See comments re sections at top of this
+ file). */
+ if (! elf_file_p (&x_ehdr)
+ || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT
+ || x_ehdr.e_ident[EI_CLASS] != ELFCLASS)
+ goto wrong;
+
+ /* Check that file's byte order matches xvec's. */
+ switch (x_ehdr.e_ident[EI_DATA])
+ {
+ case ELFDATA2MSB: /* Big-endian. */
+ if (! bfd_header_big_endian (abfd))
+ goto wrong;
+ break;
+ case ELFDATA2LSB: /* Little-endian. */
+ if (! bfd_header_little_endian (abfd))
+ goto wrong;
+ break;
+ case ELFDATANONE: /* No data encoding specified. */
+ default: /* Unknown data encoding specified . */
+ goto wrong;
}
- /* Once all of the program headers have been read and converted, we
- can start processing them. */
+ elf_swap_ehdr_in (abfd, &x_ehdr, &i_ehdr);
+#if DEBUG
+ elf_debug_file (&i_ehdr);
+#endif
+
+ if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0)
+ goto fail;
- for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++)
+ /* Read in program headers. */
+ if (_bfd_mul_overflow (i_ehdr.e_phnum, sizeof (*i_phdr), &amt))
{
- bfd_section_from_phdr (abfd, i_phdrp + phindex, phindex);
- if ((i_phdrp + phindex)->p_type == PT_NOTE)
+ bfd_set_error (bfd_error_file_too_big);
+ goto fail;
+ }
+ i_phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt);
+ if (i_phdr == NULL)
+ goto fail;
+
+ if (bfd_seek (abfd, (file_ptr) (offset + i_ehdr.e_phoff), SEEK_SET) != 0)
+ goto fail;
+
+ /* Read in program headers and parse notes. */
+ for (i = 0; i < i_ehdr.e_phnum; ++i, ++i_phdr)
+ {
+ Elf_External_Phdr x_phdr;
+
+ if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr))
+ goto fail;
+ elf_swap_phdr_in (abfd, &x_phdr, i_phdr);
+
+ if (i_phdr->p_type == PT_NOTE && i_phdr->p_filesz > 0)
{
- if (! elf_corefile_note (abfd, i_phdrp + phindex))
- return NULL;
+ elf_read_notes (abfd, offset + i_phdr->p_offset,
+ i_phdr->p_filesz, i_phdr->p_align);
+ if (abfd->build_id != NULL)
+ return TRUE;
}
}
- /* Remember the entry point specified in the ELF file header. */
-
- bfd_get_start_address (abfd) = i_ehdrp->e_entry;
+ /* Having gotten this far, we have a valid ELF section, but no
+ build-id was found. */
+ goto fail;
- return abfd->xvec;
+ wrong:
+ bfd_set_error (bfd_error_wrong_format);
+ fail:
+ return FALSE;
}
projects / thirdparty / binutils-gdb.git / blobdiff