gdb/exec.h

   1 /* Work with executable files, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef EXEC_H
  21 #define EXEC_H
  22
  23 #include "target.h"
  24 #include "progspace.h"
  25 #include "memrange.h"
  26 #include "symfile-add-flags.h"
  27
  28 struct target_section;
  29 struct target_ops;
  30 struct bfd;
  31 struct objfile;
  32
  33 #define exec_bfd current_program_space->ebfd
  34 #define exec_bfd_mtime current_program_space->ebfd_mtime
  35
  36 /* Builds a section table, given args BFD.  */
  37
  38 extern target_section_table build_section_table (struct bfd *);
  39
  40 /* The current inferior is a child vforked and its program space is
  41    shared with its parent.  This pushes the exec target on the
  42    current/child inferior's target stack if there are sections in the
  43    program space's section table.  */
  44
  45 extern void exec_on_vfork ();
  46
  47 /* Read from mappable read-only sections of BFD executable files.
  48    Return TARGET_XFER_OK, if read is successful.  Return
  49    TARGET_XFER_EOF if read is done.  Return TARGET_XFER_E_IO
  50    otherwise.  */
  51
  52 extern enum target_xfer_status
  53   exec_read_partial_read_only (gdb_byte *readbuf, ULONGEST offset,
  54                                ULONGEST len, ULONGEST *xfered_len);
  55
  56 /* Read or write from mappable sections of BFD executable files.
  57
  58    Request to transfer up to LEN 8-bit bytes of the target sections
  59    defined by SECTIONS and SECTIONS_END.  The OFFSET specifies the
  60    starting address.
  61
  62    The MATCH_CB predicate is optional; when provided it will be called
  63    for each section under consideration.  When MATCH_CB evaluates as
  64    true, the section remains under consideration; a false result
  65    removes it from consideration for performing the memory transfers
  66    noted above.  See memory_xfer_partial_1() in target.c for an
  67    example.
  68
  69    Return the number of bytes actually transfered, or zero when no
  70    data is available for the requested range.
  71
  72    This function is intended to be used from target_xfer_partial
  73    implementations.  See target_read and target_write for more
  74    information.
  75
  76    One, and only one, of readbuf or writebuf must be non-NULL.  */
  77
  78 extern enum target_xfer_status
  79   section_table_xfer_memory_partial (gdb_byte *,
  80                                      const gdb_byte *,
  81                                      ULONGEST, ULONGEST, ULONGEST *,
  82                                      const target_section_table &,
  83                                      gdb::function_view<bool
  84                                        (const struct target_section *)> match_cb
  85                                          = nullptr);
  86
  87 /* Read from mappable read-only sections of BFD executable files.
  88    Similar to exec_read_partial_read_only, but return
  89    TARGET_XFER_UNAVAILABLE if data is unavailable.  */
  90
  91 extern enum target_xfer_status
  92   section_table_read_available_memory (gdb_byte *readbuf, ULONGEST offset,
  93                                        ULONGEST len, ULONGEST *xfered_len);
  94
  95 /* Set the loaded address of a section.  */
  96 extern void exec_set_section_address (const char *, int, CORE_ADDR);
  97
  98 /* Remove all target sections owned by OWNER.  */
  99
 100 extern void remove_target_sections (void *owner);
 101
 102 /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
 103    current set of target sections.  */
 104
 105 extern void add_target_sections (void *owner,
 106                                  const target_section_table &sections);
 107
 108 /* Add the sections of OBJFILE to the current set of target sections.
 109  * OBJFILE owns the new target sections.  */
 110
 111 extern void add_target_sections_of_objfile (struct objfile *objfile);
 112
 113 /* Prints info about all sections defined in the TABLE.  ABFD is
 114    special cased --- it's filename is omitted; if it is the executable
 115    file, its entry point is printed.  */
 116
 117 extern void print_section_info (target_section_table *table,
 118                                 bfd *abfd);
 119
 120 extern void exec_close (void);
 121
 122 /* Helper function that attempts to open the symbol file at EXEC_FILE_HOST.
 123    If successful, it proceeds to add the symbol file as the main symbol file.
 124
 125    ADD_FLAGS is passed on to the function adding the symbol file.  */
 126 extern void try_open_exec_file (const char *exec_file_host,
 127                                 struct inferior *inf,
 128                                 symfile_add_flags add_flags);
 129 #endif