gdb: fix vfork with multiple threads

[deliverable/binutils-gdb.git] / gdb / exec.h

/* Work with executable files, for GDB, the GNU debugger.

   Copyright (C) 2003-2021 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 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, see <http://www.gnu.org/licenses/>.  */

#ifndef EXEC_H
#define EXEC_H

#include "target.h"
#include "progspace.h"
#include "memrange.h"
#include "symfile-add-flags.h"

struct target_section;
struct target_ops;
struct bfd;
struct objfile;

/* Builds a section table, given args BFD.  */

extern target_section_table build_section_table (struct bfd *);

/* The current inferior is a child vforked and its program space is
   shared with its parent.  This pushes the exec target on the
   current/child inferior's target stack if there are sections in the
   program space's section table.  */

extern void exec_on_vfork ();

/* Read from mappable read-only sections of BFD executable files.
   Return TARGET_XFER_OK, if read is successful.  Return
   TARGET_XFER_EOF if read is done.  Return TARGET_XFER_E_IO
   otherwise.  */

extern enum target_xfer_status
  exec_read_partial_read_only (gdb_byte *readbuf, ULONGEST offset,
			       ULONGEST len, ULONGEST *xfered_len);

/* Read or write from mappable sections of BFD executable files.

   Request to transfer up to LEN 8-bit bytes of the target sections
   defined by SECTIONS and SECTIONS_END.  The OFFSET specifies the
   starting address.

   The MATCH_CB predicate is optional; when provided it will be called
   for each section under consideration.  When MATCH_CB evaluates as
   true, the section remains under consideration; a false result
   removes it from consideration for performing the memory transfers
   noted above.  See memory_xfer_partial_1() in target.c for an
   example.

   Return the number of bytes actually transfered, or zero when no
   data is available for the requested range.

   This function is intended to be used from target_xfer_partial
   implementations.  See target_read and target_write for more
   information.

   One, and only one, of readbuf or writebuf must be non-NULL.  */

extern enum target_xfer_status
  section_table_xfer_memory_partial (gdb_byte *,
				     const gdb_byte *,
				     ULONGEST, ULONGEST, ULONGEST *,
				     const target_section_table &,
				     gdb::function_view<bool
				       (const struct target_section *)> match_cb
					 = nullptr);

/* Read from mappable read-only sections of BFD executable files.
   Similar to exec_read_partial_read_only, but return
   TARGET_XFER_UNAVAILABLE if data is unavailable.  */

extern enum target_xfer_status
  section_table_read_available_memory (gdb_byte *readbuf, ULONGEST offset,
				       ULONGEST len, ULONGEST *xfered_len);

/* Set the loaded address of a section.  */
extern void exec_set_section_address (const char *, int, CORE_ADDR);

/* Prints info about all sections defined in the TABLE.  ABFD is
   special cased --- it's filename is omitted; if it is the executable
   file, its entry point is printed.  */

extern void print_section_info (const target_section_table *table,
				bfd *abfd);

/* Helper function that attempts to open the symbol file at EXEC_FILE_HOST.
   If successful, it proceeds to add the symbol file as the main symbol file.

   ADD_FLAGS is passed on to the function adding the symbol file.  */
extern void try_open_exec_file (const char *exec_file_host,
				struct inferior *inf,
				symfile_add_flags add_flags);
#endif