[deliverable/binutils-gdb.git] / gdb / coff-solib.c

/* Handle COFF SVR3 shared libraries for GDB, the GNU Debugger.
   Copyright 1993 Free Software Foundation, Inc.
   
This file is part of GDB.

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.

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., 675 Mass Ave, Cambridge, MA 02139, USA.  */


#include "defs.h"

#include "bfd.h"
#include "gdbcore.h"
#include "symtab.h"

/*

GLOBAL FUNCTION

	coff_solib_add -- add a shared library files to the symtab list.  We
	examine the `.lib' section of the exec file and determine the names of
	the shared libraries.

	This function is responsible for discovering those names and
	addresses, and saving sufficient information about them to allow
	their symbols to be read at a later time.

SYNOPSIS

	void coff_solib_add (char *arg_string, int from_tty,
			     struct target_ops *target)

DESCRIPTION

*/

void
coff_solib_add (arg_string, from_tty, target)
     char *arg_string;
     int from_tty;
     struct target_ops *target;
{	
  asection *libsect;

  libsect = bfd_get_section_by_name (exec_bfd, ".lib");

  if (libsect)
    {
      int libsize;
      unsigned char *lib;
      struct libent
	{
	  bfd_byte len[4];
	  bfd_byte nameoffset[4];
	};

      libsize = bfd_section_size (exec_bfd, libsect);

      lib = (unsigned char *) alloca (libsize);

      bfd_get_section_contents (exec_bfd, libsect, lib, 0, libsize);

      while (libsize > 0)
	{
	  struct libent *ent;
	  struct objfile *objfile;
	  int len, nameoffset;
	  char *filename;

	  ent = (struct libent *)lib;

	  len = bfd_get_32 (exec_bfd, ent->len);

	  nameoffset = bfd_get_32 (exec_bfd, ent->nameoffset);

	  if (len <= 0)
	    break;

	  filename = (char *)ent + nameoffset * 4;

	  objfile = symbol_file_add (filename, from_tty,
				     0, /* addr */
				     0, /* not mainline */
				     0, /* not mapped */
				     0); /* Not readnow */
	  libsize -= len * 4;
	  lib += len * 4;
	}
    }
}

/*
  
GLOBAL FUNCTION
  
	coff_solib_create_inferior_hook -- shared library startup support
  
SYNOPSIS
  
	void coff_solib_create_inferior_hook()
  
DESCRIPTION
  
	When gdb starts up the inferior, the kernel maps in the shared
	libraries.  We get here with the target stopped at it's first
	instruction, and the libraries already mapped.  At this	point, this
	function gets called via expansion of the macro
	SOLIB_CREATE_INFERIOR_HOOK.
  */

void 
coff_solib_create_inferior_hook()
{
  coff_solib_add ((char *) 0, 0, (struct target_ops *) 0);
}
Commit	Line	Data
	1	/* Handle COFF SVR3 shared libraries for GDB, the GNU Debugger.
	2	Copyright 1993 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
	20
	21	#include "defs.h"
	22
	23	#include "bfd.h"
	24	#include "gdbcore.h"
	25	#include "symtab.h"
	26
	27	/*
	28
	29	GLOBAL FUNCTION
	30
	31	coff_solib_add -- add a shared library files to the symtab list. We
	32	examine the `.lib' section of the exec file and determine the names of
	33	the shared libraries.
	34
	35	This function is responsible for discovering those names and
	36	addresses, and saving sufficient information about them to allow
	37	their symbols to be read at a later time.
	38
	39	SYNOPSIS
	40
	41	void coff_solib_add (char *arg_string, int from_tty,
	42	struct target_ops *target)
	43
	44	DESCRIPTION
	45
	46	*/
	47
	48	void
	49	coff_solib_add (arg_string, from_tty, target)
	50	char *arg_string;
	51	int from_tty;
	52	struct target_ops *target;
	53	{
	54	asection *libsect;
	55
	56	libsect = bfd_get_section_by_name (exec_bfd, ".lib");
	57
	58	if (libsect)
	59	{
	60	int libsize;
	61	unsigned char *lib;
	62	struct libent
	63	{
	64	bfd_byte len[4];
	65	bfd_byte nameoffset[4];
	66	};
	67
	68	libsize = bfd_section_size (exec_bfd, libsect);
	69
	70	lib = (unsigned char *) alloca (libsize);
	71
	72	bfd_get_section_contents (exec_bfd, libsect, lib, 0, libsize);
	73
	74	while (libsize > 0)
	75	{
	76	struct libent *ent;
	77	struct objfile *objfile;
	78	int len, nameoffset;
	79	char *filename;
	80
	81	ent = (struct libent *)lib;
	82
	83	len = bfd_get_32 (exec_bfd, ent->len);
	84
	85	nameoffset = bfd_get_32 (exec_bfd, ent->nameoffset);
	86
	87	if (len <= 0)
	88	break;
	89
	90	filename = (char )ent + nameoffset 4;
	91
	92	objfile = symbol_file_add (filename, from_tty,
	93	0, /* addr */
	94	0, /* not mainline */
	95	0, /* not mapped */
	96	0); /* Not readnow */
	97	libsize -= len * 4;
	98	lib += len * 4;
	99	}
	100	}
	101	}
	102
	103	/*
	104
	105	GLOBAL FUNCTION
	106
	107	coff_solib_create_inferior_hook -- shared library startup support
	108
	109	SYNOPSIS
	110
	111	void coff_solib_create_inferior_hook()
	112
	113	DESCRIPTION
	114
	115	When gdb starts up the inferior, the kernel maps in the shared
	116	libraries. We get here with the target stopped at it's first
	117	instruction, and the libraries already mapped. At this point, this
	118	function gets called via expansion of the macro
	119	SOLIB_CREATE_INFERIOR_HOOK.
	120	*/
	121
	122	void
	123	coff_solib_create_inferior_hook()
	124	{
	125	coff_solib_add ((char ) 0, 0, (struct target_ops ) 0);
	126	}