/* BFD back-end for HP/UX core files. Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. Written by Stu Grossman, Cygnus Support. Converted to back-end form by Ian Lance Taylor, Cygnus SUpport 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 3 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. 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. */ /* This file can only be compiled on systems which use HP/UX style core files. */ #include "sysdep.h" #include "bfd.h" #include "libbfd.h" #if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX) /* FIXME: sys/core.h doesn't exist for HPUX version 7. HPUX version 5, 6, and 7 core files seem to be standard trad-core.c type core files; can we just use trad-core.c in addition to this file? */ #include <sys/core.h> #include <sys/utsname.h> #endif /* HOST_HPPAHPUX */ #ifdef HOST_HPPABSD /* Not a very swift place to put it, but that's where the BSD port puts them. */ #include "/hpux/usr/include/sys/core.h" #endif /* HOST_HPPABSD */ #include <sys/param.h> #ifdef HAVE_DIRENT_H # include <dirent.h> #else # ifdef HAVE_SYS_NDIR_H # include <sys/ndir.h> # endif # ifdef HAVE_SYS_DIR_H # include <sys/dir.h> # endif # ifdef HAVE_NDIR_H # include <ndir.h> # endif #endif #include <signal.h> #ifdef HPUX_CORE #include <machine/reg.h> #endif #include <sys/file.h> /* Kludge: There's no explicit mechanism provided by sys/core.h to conditionally know whether a proc_info has thread id fields. However, CORE_ANON_SHMEM shows up first at 10.30, which is happily also when meaningful thread id's show up in proc_info. */ #if defined(CORE_ANON_SHMEM) #define PROC_INFO_HAS_THREAD_ID (1) #endif /* This type appears at HP-UX 10.30. Defining it if not defined by sys/core.h allows us to build for older HP-UX's, and (since it won't be encountered in core-dumps from older HP-UX's) is harmless. */ #if !defined(CORE_ANON_SHMEM) #define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */ #endif /* These are stored in the bfd's tdata */ /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they are set to 0. Also, until HP-UX implements MxN threads, .user_tid and .lwpid are synonymous. */ struct hpux_core_struct { int sig; int lwpid; /* Kernel thread ID. */ unsigned long user_tid; /* User thread ID. */ char cmd[MAXCOMLEN + 1]; }; #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data) #define core_signal(bfd) (core_hdr(bfd)->sig) #define core_command(bfd) (core_hdr(bfd)->cmd) #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid) #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid) #define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p static asection *make_bfd_asection (bfd *, const char *, flagword, bfd_size_type, bfd_vma, unsigned int); static const bfd_target *hpux_core_core_file_p (bfd *); static char *hpux_core_core_file_failing_command (bfd *); static int hpux_core_core_file_failing_signal (bfd *); static void swap_abort (void); static asection * make_bfd_asection (bfd *abfd, const char *name, flagword flags, bfd_size_type size, bfd_vma vma, unsigned int alignment_power) { asection *asect; char *newname; newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1); if (!newname) return NULL; strcpy (newname, name); asect = bfd_make_section_anyway_with_flags (abfd, newname, flags); if (!asect) return NULL; asect->size = size; asect->vma = vma; asect->filepos = bfd_tell (abfd); asect->alignment_power = alignment_power; return asect; } /* Return true if the given core file section corresponds to a thread, based on its name. */ static int thread_section_p (bfd *abfd ATTRIBUTE_UNUSED, asection *sect, void *obj ATTRIBUTE_UNUSED) { return CONST_STRNEQ (sect->name, ".reg/"); } /* this function builds a bfd target if the file is a corefile. It returns null or 0 if it finds out thaat it is not a core file. The way it checks this is by looking for allowed 'type' field values. These are declared in sys/core.h There are some values which are 'reserved for future use'. In particular CORE_NONE is actually defined as 0. This may be a catch-all for cases in which the core file is generated by some non-hpux application. (I am just guessing here!) */ static const bfd_target * hpux_core_core_file_p (bfd *abfd) { int good_sections = 0; int unknown_sections = 0; core_hdr (abfd) = (struct hpux_core_struct *) bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct)); if (!core_hdr (abfd)) return NULL; while (1) { int val; struct corehead core_header; val = bfd_bread ((void *) &core_header, (bfd_size_type) sizeof core_header, abfd); if (val <= 0) break; switch (core_header.type) { case CORE_KERNEL: case CORE_FORMAT: /* Just skip this. */ bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR); good_sections++; break; case CORE_EXEC: { struct proc_exec proc_exec; if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len, abfd) != core_header.len) break; strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1); good_sections++; } break; case CORE_PROC: { struct proc_info proc_info; char secname[100]; /* Of arbitrary size, but plenty large. */ /* We need to read this section, 'cause we need to determine whether the core-dumped app was threaded before we create any .reg sections. */ if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd) != core_header.len) break; /* However, we also want to create those sections with the file positioned at the start of the record, it seems. */ if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0) break; #if defined(PROC_INFO_HAS_THREAD_ID) core_kernel_thread_id (abfd) = proc_info.lwpid; core_user_thread_id (abfd) = proc_info.user_tid; #else core_kernel_thread_id (abfd) = 0; core_user_thread_id (abfd) = 0; #endif /* If the program was unthreaded, then we'll just create a .reg section. If the program was threaded, then we'll create .reg/XXXXX section for each thread, where XXXXX is a printable representation of the kernel thread id. We'll also create a .reg section for the thread that was running and signalled at the time of the core-dump (i.e., this is effectively an alias, needed to keep GDB happy.) Note that we use `.reg/XXXXX' as opposed to '.regXXXXX' because GDB expects that .reg2 will be the floating- point registers. */ if (core_kernel_thread_id (abfd) == 0) { if (!make_bfd_asection (abfd, ".reg", SEC_HAS_CONTENTS, core_header.len, (bfd_vma) offsetof (struct proc_info, hw_regs), 2)) goto fail; } else { /* There are threads. Is this the one that caused the core-dump? We'll claim it was the running thread. */ if (proc_info.sig != -1) { if (!make_bfd_asection (abfd, ".reg", SEC_HAS_CONTENTS, core_header.len, (bfd_vma)offsetof (struct proc_info, hw_regs), 2)) goto fail; } /* We always make one of these sections, for every thread. */ sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd)); if (!make_bfd_asection (abfd, secname, SEC_HAS_CONTENTS, core_header.len, (bfd_vma) offsetof (struct proc_info, hw_regs), 2)) goto fail; } core_signal (abfd) = proc_info.sig; if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0) break; good_sections++; } break; case CORE_DATA: case CORE_STACK: case CORE_TEXT: case CORE_MMF: case CORE_SHM: case CORE_ANON_SHMEM: if (!make_bfd_asection (abfd, ".data", SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS, core_header.len, (bfd_vma) core_header.addr, 2)) goto fail; bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR); good_sections++; break; case CORE_NONE: /* Let's not punt if we encounter a section of unknown type. Rather, let's make a note of it. If we later see that there were also "good" sections, then we'll declare that this a core file, but we'll also warn that it may be incompatible with this gdb. */ unknown_sections++; break; default: goto fail; /*unrecognized core file type */ } } /* OK, we believe you. You're a core file (sure, sure). */ /* On HP/UX, we sometimes encounter core files where none of the threads was found to be the running thread (ie the signal was set to -1 for all threads). This happens when the program was aborted externally via a TT_CORE ttrace system call. In that case, we just pick one thread at random to be the active thread. */ if (core_kernel_thread_id (abfd) != 0 && bfd_get_section_by_name (abfd, ".reg") == NULL) { asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL); asection *reg_sect; if (asect != NULL) { reg_sect = make_bfd_asection (abfd, ".reg", asect->flags, asect->size, asect->vma, asect->alignment_power); if (reg_sect == NULL) goto fail; reg_sect->filepos = asect->filepos; } } /* Were there sections of unknown type? If so, yet there were at least some complete sections of known type, then, issue a warning. Possibly the core file was generated on a version of HP-UX that is incompatible with that for which this gdb was built. */ if ((unknown_sections > 0) && (good_sections > 0)) (*_bfd_error_handler) ("%s appears to be a core file,\nbut contains unknown sections. It may have been created on an incompatible\nversion of HP-UX. As a result, some information may be unavailable.\n", abfd->filename); return abfd->xvec; fail: bfd_release (abfd, core_hdr (abfd)); core_hdr (abfd) = NULL; bfd_section_list_clear (abfd); return NULL; } static char * hpux_core_core_file_failing_command (bfd *abfd) { return core_command (abfd); } static int hpux_core_core_file_failing_signal (bfd *abfd) { return core_signal (abfd); } /* If somebody calls any byte-swapping routines, shoot them. */ static void swap_abort (void) { abort(); /* This way doesn't require any declaration for ANSI to fuck up */ } #define NO_GET ((bfd_vma (*) (const void *)) swap_abort) #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) const bfd_target hpux_core_vec = { "hpux-core", bfd_target_unknown_flavour, BFD_ENDIAN_BIG, /* target byte order */ BFD_ENDIAN_BIG, /* target headers byte order */ (HAS_RELOC | EXEC_P | /* object flags */ HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 0, /* symbol prefix */ ' ', /* ar_pad_char */ 16, /* ar_max_namelen */ NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ { /* bfd_check_format */ _bfd_dummy_target, /* unknown format */ _bfd_dummy_target, /* object file */ _bfd_dummy_target, /* archive */ hpux_core_core_file_p /* a core file */ }, { /* bfd_set_format */ bfd_false, bfd_false, bfd_false, bfd_false }, { /* bfd_write_contents */ bfd_false, bfd_false, bfd_false, bfd_false }, BFD_JUMP_TABLE_GENERIC (_bfd_generic), BFD_JUMP_TABLE_COPY (_bfd_generic), BFD_JUMP_TABLE_CORE (hpux_core), BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), BFD_JUMP_TABLE_WRITE (_bfd_generic), BFD_JUMP_TABLE_LINK (_bfd_nolink), BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), NULL, (PTR) 0 /* backend_data */ };