bfd/ptrace-core.c - binutils-gdb - Git at Google

 /* BFD backend for core files which use the ptrace_user structure
    Copyright (C) 1993-2021 Free Software Foundation, Inc.
    The structure of this file is based on trad-core.c written by John Gilmore
    of Cygnus Support.
    Modified to work with the ptrace_user structure by Kevin A. Buettner.
    (Longterm it may be better to merge this file with trad-core.c)

    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.  */

 #ifdef PTRACE_CORE

 #include "sysdep.h"
 #include "bfd.h"
 #include "libbfd.h"

 #include <sys/param.h>
 #include <sys/dir.h>
 #include <signal.h>
 #include <sys/ptrace.h>

 struct trad_core_struct
 {
   asection *data_section;
   asection *stack_section;
   asection *reg_section;
   struct ptrace_user u;
 };

 #define core_upage(bfd)  (&((bfd)->tdata.trad_core_data->u))
 #define core_datasec(bfd)  ((bfd)->tdata.trad_core_data->data_section)
 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
 #define core_regsec(bfd)   ((bfd)->tdata.trad_core_data->reg_section)

 /* forward declarations */

 const bfd_target *ptrace_unix_core_file_p (bfd *abfd);
 char * ptrace_unix_core_file_failing_command (bfd *abfd);
 int ptrace_unix_core_file_failing_signal (bfd *abfd);
 #define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
 #define ptrace_unix_core_file_pid _bfd_nocore_core_file_pid
 static void swap_abort (void);

 bfd_cleanup
 ptrace_unix_core_file_p (bfd *abfd)
 {
   int val;
   struct ptrace_user u;
   struct trad_core_struct *rawptr;
   size_t amt;
   flagword flags;

   val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);
   if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
       || u.pt_rev != _BCS_PTRACE_REV)
     {
       /* Too small to be a core file */
       bfd_set_error (bfd_error_wrong_format);
       return 0;
     }

   /* OK, we believe you.  You're a core file (sure, sure).  */

   /* Allocate both the upage and the struct core_data at once, so
      a single free() will free them both.  */
   amt = sizeof (struct trad_core_struct);
   rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);

   if (rawptr == NULL)
     return 0;

   abfd->tdata.trad_core_data = rawptr;

   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */

   /* Create the sections.  */

   flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
   core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
 							     flags);
   if (core_stacksec (abfd) == NULL)
     goto fail;
   core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
 							    flags);
   if (core_datasec (abfd) == NULL)
     goto fail;
   core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
 							   SEC_HAS_CONTENTS);
   if (core_regsec (abfd) == NULL)
     goto fail;

   /* FIXME:  Need to worry about shared memory, library data, and library
      text.  I don't think that any of these things are supported on the
      system on which I am developing this for though.  */

   core_datasec (abfd)->size =  u.pt_dsize;
   core_stacksec (abfd)->size = u.pt_ssize;
   core_regsec (abfd)->size = sizeof (u);

   core_datasec (abfd)->vma = u.pt_o_data_start;
   core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
   core_regsec (abfd)->vma = 0 - sizeof (u);	/* see trad-core.c */

   core_datasec (abfd)->filepos = (int) u.pt_dataptr;
   core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
   core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */

   /* Align to word at least */
   core_stacksec (abfd)->alignment_power = 2;
   core_datasec (abfd)->alignment_power = 2;
   core_regsec (abfd)->alignment_power = 2;

   return _bfd_no_cleanup;

  fail:
   bfd_release (abfd, abfd->tdata.any);
   abfd->tdata.any = NULL;
   bfd_section_list_clear (abfd);
   return NULL;
 }

 char *
 ptrace_unix_core_file_failing_command (bfd *abfd)
 {
   char *com = abfd->tdata.trad_core_data->u.pt_comm;

   if (*com)
     return com;
   else
     return 0;
 }

 int
 ptrace_unix_core_file_failing_signal (bfd *abfd)
 {
   return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
 }

 /* 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 core_ptrace_vec =
   {
     "trad-core",
     bfd_target_unknown_flavour,
     BFD_ENDIAN_UNKNOWN,		/* target byte order */
     BFD_ENDIAN_UNKNOWN,		/* 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 */
     TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols.  */
     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 */
       ptrace_unix_core_file_p		/* a core file */
     },
     {				/* bfd_set_format */
       _bfd_bool_bfd_false_error, bfd_false,
       _bfd_bool_bfd_false_error, bfd_false
     },
     {				/* bfd_write_contents */
       _bfd_bool_bfd_false_error, bfd_false,
       _bfd_bool_bfd_false_error, bfd_false
     },

     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
     BFD_JUMP_TABLE_COPY (_bfd_generic),
     BFD_JUMP_TABLE_CORE (ptrace_unix),
     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,

     NULL			/* backend_data */
   };

 #endif /* PTRACE_CORE */
	/* BFD backend for core files which use the ptrace_user structure
	Copyright (C) 1993-2021 Free Software Foundation, Inc.
	The structure of this file is based on trad-core.c written by John Gilmore
	of Cygnus Support.
	Modified to work with the ptrace_user structure by Kevin A. Buettner.
	(Longterm it may be better to merge this file with trad-core.c)

	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. */

	#ifdef PTRACE_CORE

	#include "sysdep.h"
	#include "bfd.h"
	#include "libbfd.h"

	#include <sys/param.h>
	#include <sys/dir.h>
	#include <signal.h>
	#include <sys/ptrace.h>

	struct trad_core_struct
	{
	asection *data_section;
	asection *stack_section;
	asection *reg_section;
	struct ptrace_user u;
	};

	#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
	#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
	#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
	#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)

	/* forward declarations */

	const bfd_target ptrace_unix_core_file_p (bfd abfd);
	char * ptrace_unix_core_file_failing_command (bfd *abfd);
	int ptrace_unix_core_file_failing_signal (bfd *abfd);
	#define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
	#define ptrace_unix_core_file_pid _bfd_nocore_core_file_pid
	static void swap_abort (void);

	bfd_cleanup
	ptrace_unix_core_file_p (bfd *abfd)
	{
	int val;
	struct ptrace_user u;
	struct trad_core_struct *rawptr;
	size_t amt;
	flagword flags;

	val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);
	if (val != sizeof u \|\| u.pt_magic != _BCS_PTRACE_MAGIC
	\|\| u.pt_rev != _BCS_PTRACE_REV)
	{
	/* Too small to be a core file */
	bfd_set_error (bfd_error_wrong_format);
	return 0;
	}

	/* OK, we believe you. You're a core file (sure, sure). */

	/* Allocate both the upage and the struct core_data at once, so
	a single free() will free them both. */
	amt = sizeof (struct trad_core_struct);
	rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);

	if (rawptr == NULL)
	return 0;

	abfd->tdata.trad_core_data = rawptr;

	rawptr->u = u; /Copy the uarea into the tdata part of the bfd /

	/* Create the sections. */

	flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
	core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
	flags);
	if (core_stacksec (abfd) == NULL)
	goto fail;
	core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
	flags);
	if (core_datasec (abfd) == NULL)
	goto fail;
	core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
	SEC_HAS_CONTENTS);
	if (core_regsec (abfd) == NULL)
	goto fail;

	/* FIXME: Need to worry about shared memory, library data, and library
	text. I don't think that any of these things are supported on the
	system on which I am developing this for though. */

	core_datasec (abfd)->size = u.pt_dsize;
	core_stacksec (abfd)->size = u.pt_ssize;
	core_regsec (abfd)->size = sizeof (u);

	core_datasec (abfd)->vma = u.pt_o_data_start;
	core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
	core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */

	core_datasec (abfd)->filepos = (int) u.pt_dataptr;
	core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
	core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */

	/* Align to word at least */
	core_stacksec (abfd)->alignment_power = 2;
	core_datasec (abfd)->alignment_power = 2;
	core_regsec (abfd)->alignment_power = 2;

	return _bfd_no_cleanup;

	fail:
	bfd_release (abfd, abfd->tdata.any);
	abfd->tdata.any = NULL;
	bfd_section_list_clear (abfd);
	return NULL;
	}

	char *
	ptrace_unix_core_file_failing_command (bfd *abfd)
	{
	char *com = abfd->tdata.trad_core_data->u.pt_comm;

	if (*com)
	return com;
	else
	return 0;
	}

	int
	ptrace_unix_core_file_failing_signal (bfd *abfd)
	{
	return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
	}

	/* 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 core_ptrace_vec =
	{
	"trad-core",
	bfd_target_unknown_flavour,
	BFD_ENDIAN_UNKNOWN, /* target byte order */
	BFD_ENDIAN_UNKNOWN, /* 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 */
	TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
	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 */
	ptrace_unix_core_file_p /* a core file */
	},
	{ /* bfd_set_format */
	_bfd_bool_bfd_false_error, bfd_false,
	_bfd_bool_bfd_false_error, bfd_false
	},
	{ /* bfd_write_contents */
	_bfd_bool_bfd_false_error, bfd_false,
	_bfd_bool_bfd_false_error, bfd_false
	},

	BFD_JUMP_TABLE_GENERIC (_bfd_generic),
	BFD_JUMP_TABLE_COPY (_bfd_generic),
	BFD_JUMP_TABLE_CORE (ptrace_unix),
	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,

	NULL /* backend_data */
	};

	#endif /* PTRACE_CORE */