199b2450f6
Change all references to stdout/stderr to gdb_stdout/gdb_stderr. Replace all calls to stdio output functions with calls to corresponding _unfiltered functions (`fprintf_unfiltered') Replaced calls to fopen for output to gdb_fopen. Added sufficient goo to utils.c and defs.h to make the above work. The net effect is that stdio output functions are only directly used in utils.c. Elsewhere, the _unfiltered and _filtered functions and GDB_FILE type are used. In the near future, GDB_FILE will stop being equivalant to FILE. The semantics of some commands has changed in a very subtle way: called in the right context, they may cause new occurences of prompt_for_continue() behavior. The testsuite doesn't notice anything like this, though. Please respect this change by not reintroducing stdio output dependencies in the main body of gdb code. All output from commands should go to a GDB_FILE. Target-specific code can still use stdio directly to communicate with targets.
789 lines
20 KiB
C
789 lines
20 KiB
C
/* Handle OSF/1 shared libraries for GDB, the GNU Debugger.
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Copyright 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* FIXME: Most of this code could be merged with solib.c by using
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next_link_map_member and xfer_link_map_member in solib.c. */
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#include "defs.h"
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#include <sys/types.h>
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#include <signal.h>
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#include <string.h>
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#include <fcntl.h>
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#include "symtab.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "gdbcore.h"
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#include "command.h"
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#include "target.h"
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#include "frame.h"
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#include "regex.h"
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#include "inferior.h"
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#include "language.h"
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#define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */
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/* FIXME: This is a terrible hack for shared library support under OSF/1.
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The main problem is that the needed definitions are not contained in
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the system header files.
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The ldr_* routines described in loader(3) would be the way to go here.
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But they do not work for arbitrary target processes (as documented). */
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#ifndef USE_LDR_ROUTINES
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#define RLD_CONTEXT_ADDRESS 0x3ffc0000000
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typedef struct
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{
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CORE_ADDR next;
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CORE_ADDR previous;
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CORE_ADDR unknown;
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char *module_name;
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CORE_ADDR modinfo_addr;
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} ldr_module_info_t;
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typedef struct
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{
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CORE_ADDR unknown1;
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CORE_ADDR unknown2;
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CORE_ADDR head;
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CORE_ADDR tail;
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} ldr_context_t;
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static ldr_context_t ldr_context;
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#else
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#include <loader.h>
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#endif
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/* Define our own link_map structure.
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This will help to share code with solib.c. */
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struct link_map {
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CORE_ADDR l_addr; /* address at which object mapped */
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char *l_name; /* full name of loaded object */
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ldr_module_info_t module_info; /* corresponding module info */
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};
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#define LM_ADDR(so) ((so) -> lm.l_addr)
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#define LM_NAME(so) ((so) -> lm.l_name)
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struct so_list {
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struct so_list *next; /* next structure in linked list */
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struct link_map lm; /* copy of link map from inferior */
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struct link_map *lmaddr; /* addr in inferior lm was read from */
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CORE_ADDR lmend; /* upper addr bound of mapped object */
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char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */
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char symbols_loaded; /* flag: symbols read in yet? */
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char from_tty; /* flag: print msgs? */
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struct objfile *objfile; /* objfile for loaded lib */
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struct section_table *sections;
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struct section_table *sections_end;
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struct section_table *textsection;
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bfd *abfd;
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};
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static struct so_list *so_list_head; /* List of known shared objects */
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extern int
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fdmatch PARAMS ((int, int)); /* In libiberty */
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/* Local function prototypes */
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static void
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sharedlibrary_command PARAMS ((char *, int));
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static void
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info_sharedlibrary_command PARAMS ((char *, int));
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static int
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symbol_add_stub PARAMS ((char *));
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static struct so_list *
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find_solib PARAMS ((struct so_list *));
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static struct link_map *
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first_link_map_member PARAMS ((void));
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static struct link_map *
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next_link_map_member PARAMS ((struct so_list *));
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static void
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xfer_link_map_member PARAMS ((struct so_list *, struct link_map *));
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static void
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solib_map_sections PARAMS ((struct so_list *));
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/*
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LOCAL FUNCTION
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solib_map_sections -- open bfd and build sections for shared lib
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SYNOPSIS
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static void solib_map_sections (struct so_list *so)
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DESCRIPTION
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Given a pointer to one of the shared objects in our list
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of mapped objects, use the recorded name to open a bfd
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descriptor for the object, build a section table, and then
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relocate all the section addresses by the base address at
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which the shared object was mapped.
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FIXMES
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In most (all?) cases the shared object file name recorded in the
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dynamic linkage tables will be a fully qualified pathname. For
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cases where it isn't, do we really mimic the systems search
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mechanism correctly in the below code (particularly the tilde
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expansion stuff?).
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*/
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static void
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solib_map_sections (so)
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struct so_list *so;
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{
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char *filename;
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char *scratch_pathname;
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int scratch_chan;
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struct section_table *p;
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struct cleanup *old_chain;
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bfd *abfd;
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filename = tilde_expand (so -> so_name);
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old_chain = make_cleanup (free, filename);
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scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
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&scratch_pathname);
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if (scratch_chan < 0)
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{
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scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
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O_RDONLY, 0, &scratch_pathname);
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}
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if (scratch_chan < 0)
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{
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perror_with_name (filename);
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}
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/* Leave scratch_pathname allocated. bfd->name will point to it. */
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abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
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if (!abfd)
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{
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close (scratch_chan);
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error ("Could not open `%s' as an executable file: %s",
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scratch_pathname, bfd_errmsg (bfd_error));
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}
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/* Leave bfd open, core_xfer_memory and "info files" need it. */
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so -> abfd = abfd;
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abfd -> cacheable = true;
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if (!bfd_check_format (abfd, bfd_object))
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{
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error ("\"%s\": not in executable format: %s.",
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scratch_pathname, bfd_errmsg (bfd_error));
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}
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if (build_section_table (abfd, &so -> sections, &so -> sections_end))
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{
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error ("Can't find the file sections in `%s': %s",
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bfd_get_filename (exec_bfd), bfd_errmsg (bfd_error));
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}
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for (p = so -> sections; p < so -> sections_end; p++)
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{
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/* Relocate the section binding addresses as recorded in the shared
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object's file by the base address to which the object was actually
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mapped. */
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p -> addr += (CORE_ADDR) LM_ADDR (so);
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p -> endaddr += (CORE_ADDR) LM_ADDR (so);
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so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
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if (STREQ (p -> sec_ptr -> name, ".text"))
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{
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so -> textsection = p;
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}
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}
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/* Free the file names, close the file now. */
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do_cleanups (old_chain);
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}
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/*
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LOCAL FUNCTION
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first_link_map_member -- locate first member in dynamic linker's map
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SYNOPSIS
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static struct link_map *first_link_map_member (void)
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DESCRIPTION
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Read in a copy of the first member in the inferior's dynamic
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link map from the inferior's dynamic linker structures, and return
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a pointer to the copy in our address space.
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*/
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static struct link_map *
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first_link_map_member ()
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{
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struct link_map *lm = NULL;
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static struct link_map first_lm;
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#ifdef USE_LDR_ROUTINES
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ldr_module_t mod_id = LDR_NULL_MODULE;
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size_t retsize;
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if (ldr_next_module(inferior_pid, &mod_id) != 0
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|| mod_id == LDR_NULL_MODULE
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|| ldr_inq_module(inferior_pid, mod_id,
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&first_lm.module_info, sizeof(ldr_module_info_t),
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&retsize) != 0)
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return lm;
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#else
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CORE_ADDR ldr_context_addr;
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if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
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(char *) &ldr_context_addr,
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sizeof (CORE_ADDR)) != 0
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|| target_read_memory (ldr_context_addr,
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(char *) &ldr_context,
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sizeof (ldr_context_t)) != 0
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|| target_read_memory ((CORE_ADDR) ldr_context.head,
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(char *) &first_lm.module_info,
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sizeof (ldr_module_info_t)) != 0)
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return lm;
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#endif
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lm = &first_lm;
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/* The first entry is for the main program and should be skipped. */
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lm->l_name = NULL;
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return lm;
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}
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static struct link_map *
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next_link_map_member (so_list_ptr)
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struct so_list *so_list_ptr;
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{
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struct link_map *lm = NULL;
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static struct link_map next_lm;
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#ifdef USE_LDR_ROUTINES
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ldr_module_t mod_id = lm->module_info.lmi_modid;
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size_t retsize;
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if (ldr_next_module(inferior_pid, &mod_id) != 0
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|| mod_id == LDR_NULL_MODULE
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|| ldr_inq_module(inferior_pid, mod_id,
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&next_lm.module_info, sizeof(ldr_module_info_t),
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&retsize) != 0)
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return lm;
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lm = &next_lm;
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lm->l_name = lm->module_info.lmi_name;
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#else
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CORE_ADDR ldr_context_addr;
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/* Reread context in case ldr_context.tail was updated. */
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if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
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(char *) &ldr_context_addr,
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sizeof (CORE_ADDR)) != 0
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|| target_read_memory (ldr_context_addr,
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(char *) &ldr_context,
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sizeof (ldr_context_t)) != 0
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|| so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail
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|| target_read_memory (so_list_ptr->lm.module_info.next,
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(char *) &next_lm.module_info,
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sizeof (ldr_module_info_t)) != 0)
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return lm;
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lm = &next_lm;
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lm->l_name = lm->module_info.module_name;
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#endif
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return lm;
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}
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static void
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xfer_link_map_member (so_list_ptr, lm)
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struct so_list *so_list_ptr;
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struct link_map *lm;
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{
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so_list_ptr->lm = *lm;
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/* OSF/1 has absolute addresses in shared libraries. */
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LM_ADDR (so_list_ptr) = 0;
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/* There is one entry that has no name (for the inferior executable)
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since it is not a shared object. */
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if (LM_NAME (so_list_ptr) != 0)
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{
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#ifdef USE_LDR_ROUTINES
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int len = strlen (LM_NAME (so_list_ptr) + 1);
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if (len > MAX_PATH_SIZE)
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len = MAX_PATH_SIZE;
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strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE);
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#else
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if (!target_read_string((CORE_ADDR) LM_NAME (so_list_ptr),
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so_list_ptr->so_name, MAX_PATH_SIZE - 1))
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error ("xfer_link_map_member: Can't read pathname for load map\n");
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#endif
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so_list_ptr->so_name[MAX_PATH_SIZE - 1] = 0;
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solib_map_sections (so_list_ptr);
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}
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}
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/*
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LOCAL FUNCTION
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find_solib -- step through list of shared objects
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SYNOPSIS
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struct so_list *find_solib (struct so_list *so_list_ptr)
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DESCRIPTION
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This module contains the routine which finds the names of any
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loaded "images" in the current process. The argument in must be
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NULL on the first call, and then the returned value must be passed
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in on subsequent calls. This provides the capability to "step" down
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the list of loaded objects. On the last object, a NULL value is
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returned.
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The arg and return value are "struct link_map" pointers, as defined
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in <link.h>.
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*/
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static struct so_list *
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find_solib (so_list_ptr)
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struct so_list *so_list_ptr; /* Last lm or NULL for first one */
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{
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struct so_list *so_list_next = NULL;
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struct link_map *lm = NULL;
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struct so_list *new;
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if (so_list_ptr == NULL)
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{
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/* We are setting up for a new scan through the loaded images. */
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if ((so_list_next = so_list_head) == NULL)
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{
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/* Find the first link map list member. */
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lm = first_link_map_member ();
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}
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}
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else
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{
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/* We have been called before, and are in the process of walking
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the shared library list. Advance to the next shared object. */
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lm = next_link_map_member (so_list_ptr);
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so_list_next = so_list_ptr -> next;
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}
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if ((so_list_next == NULL) && (lm != NULL))
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{
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/* Get next link map structure from inferior image and build a local
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abbreviated load_map structure */
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new = (struct so_list *) xmalloc (sizeof (struct so_list));
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memset ((char *) new, 0, sizeof (struct so_list));
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new -> lmaddr = lm;
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/* Add the new node as the next node in the list, or as the root
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node if this is the first one. */
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if (so_list_ptr != NULL)
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{
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so_list_ptr -> next = new;
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}
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else
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{
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so_list_head = new;
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}
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so_list_next = new;
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xfer_link_map_member (new, lm);
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}
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return (so_list_next);
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}
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|
|
|
/* A small stub to get us past the arg-passing pinhole of catch_errors. */
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|
|
static int
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symbol_add_stub (arg)
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|
char *arg;
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|
{
|
|
register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
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|
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|
so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
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|
so -> textsection -> addr,
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|
0, 0, 0);
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|
return (1);
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|
}
|
|
|
|
/*
|
|
|
|
GLOBAL FUNCTION
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|
|
|
solib_add -- add a shared library file to the symtab and section list
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|
|
|
SYNOPSIS
|
|
|
|
void solib_add (char *arg_string, int from_tty,
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|
struct target_ops *target)
|
|
|
|
DESCRIPTION
|
|
|
|
*/
|
|
|
|
void
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|
solib_add (arg_string, from_tty, target)
|
|
char *arg_string;
|
|
int from_tty;
|
|
struct target_ops *target;
|
|
{
|
|
register struct so_list *so = NULL; /* link map state variable */
|
|
|
|
/* Last shared library that we read. */
|
|
struct so_list *so_last = NULL;
|
|
|
|
char *re_err;
|
|
int count;
|
|
int old;
|
|
|
|
if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
|
|
{
|
|
error ("Invalid regexp: %s", re_err);
|
|
}
|
|
|
|
|
|
/* Add the shared library sections to the section table of the
|
|
specified target, if any. We have to do this before reading the
|
|
symbol files as symbol_file_add calls reinit_frame_cache and
|
|
creating a new frame might access memory in the shared library. */
|
|
if (target)
|
|
{
|
|
/* Count how many new section_table entries there are. */
|
|
so = NULL;
|
|
count = 0;
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0])
|
|
{
|
|
count += so -> sections_end - so -> sections;
|
|
}
|
|
}
|
|
|
|
if (count)
|
|
{
|
|
/* Reallocate the target's section table including the new size. */
|
|
if (target -> to_sections)
|
|
{
|
|
old = target -> to_sections_end - target -> to_sections;
|
|
target -> to_sections = (struct section_table *)
|
|
xrealloc ((char *)target -> to_sections,
|
|
(sizeof (struct section_table)) * (count + old));
|
|
}
|
|
else
|
|
{
|
|
old = 0;
|
|
target -> to_sections = (struct section_table *)
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|
xmalloc ((sizeof (struct section_table)) * count);
|
|
}
|
|
target -> to_sections_end = target -> to_sections + (count + old);
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|
|
|
/* Add these section table entries to the target's table. */
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0])
|
|
{
|
|
count = so -> sections_end - so -> sections;
|
|
memcpy ((char *) (target -> to_sections + old),
|
|
so -> sections,
|
|
(sizeof (struct section_table)) * count);
|
|
old += count;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Now add the symbol files. */
|
|
so = NULL;
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0] && re_exec (so -> so_name))
|
|
{
|
|
so -> from_tty = from_tty;
|
|
if (so -> symbols_loaded)
|
|
{
|
|
if (from_tty)
|
|
{
|
|
printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name);
|
|
}
|
|
}
|
|
else if (catch_errors
|
|
(symbol_add_stub, (char *) so,
|
|
"Error while reading shared library symbols:\n",
|
|
RETURN_MASK_ALL))
|
|
{
|
|
so_last = so;
|
|
so -> symbols_loaded = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
info_sharedlibrary_command -- code for "info sharedlibrary"
|
|
|
|
SYNOPSIS
|
|
|
|
static void info_sharedlibrary_command ()
|
|
|
|
DESCRIPTION
|
|
|
|
Walk through the shared library list and print information
|
|
about each attached library.
|
|
*/
|
|
|
|
static void
|
|
info_sharedlibrary_command (ignore, from_tty)
|
|
char *ignore;
|
|
int from_tty;
|
|
{
|
|
register struct so_list *so = NULL; /* link map state variable */
|
|
int header_done = 0;
|
|
|
|
if (exec_bfd == NULL)
|
|
{
|
|
printf_unfiltered ("No exec file.\n");
|
|
return;
|
|
}
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0])
|
|
{
|
|
unsigned long txt_start = 0;
|
|
unsigned long txt_end = 0;
|
|
|
|
if (!header_done)
|
|
{
|
|
printf_unfiltered("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read",
|
|
"Shared Object Library");
|
|
header_done++;
|
|
}
|
|
if (so -> textsection)
|
|
{
|
|
txt_start = (unsigned long) so -> textsection -> addr;
|
|
txt_end = (unsigned long) so -> textsection -> endaddr;
|
|
}
|
|
printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l"));
|
|
printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l"));
|
|
printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No");
|
|
printf_unfiltered ("%s\n", so -> so_name);
|
|
}
|
|
}
|
|
if (so_list_head == NULL)
|
|
{
|
|
printf_unfiltered ("No shared libraries loaded at this time.\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
GLOBAL FUNCTION
|
|
|
|
solib_address -- check to see if an address is in a shared lib
|
|
|
|
SYNOPSIS
|
|
|
|
int solib_address (CORE_ADDR address)
|
|
|
|
DESCRIPTION
|
|
|
|
Provides a hook for other gdb routines to discover whether or
|
|
not a particular address is within the mapped address space of
|
|
a shared library. Any address between the base mapping address
|
|
and the first address beyond the end of the last mapping, is
|
|
considered to be within the shared library address space, for
|
|
our purposes.
|
|
|
|
For example, this routine is called at one point to disable
|
|
breakpoints which are in shared libraries that are not currently
|
|
mapped in.
|
|
*/
|
|
|
|
int
|
|
solib_address (address)
|
|
CORE_ADDR address;
|
|
{
|
|
register struct so_list *so = 0; /* link map state variable */
|
|
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0] && so -> textsection)
|
|
{
|
|
if ((address >= (CORE_ADDR) so -> textsection -> addr) &&
|
|
(address < (CORE_ADDR) so -> textsection -> endaddr))
|
|
{
|
|
return (1);
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* Called by free_all_symtabs */
|
|
|
|
void
|
|
clear_solib()
|
|
{
|
|
struct so_list *next;
|
|
char *bfd_filename;
|
|
|
|
while (so_list_head)
|
|
{
|
|
if (so_list_head -> sections)
|
|
{
|
|
free ((PTR)so_list_head -> sections);
|
|
}
|
|
if (so_list_head -> abfd)
|
|
{
|
|
bfd_filename = bfd_get_filename (so_list_head -> abfd);
|
|
bfd_close (so_list_head -> abfd);
|
|
}
|
|
else
|
|
/* This happens for the executable on SVR4. */
|
|
bfd_filename = NULL;
|
|
|
|
next = so_list_head -> next;
|
|
if (bfd_filename)
|
|
free ((PTR)bfd_filename);
|
|
free ((PTR)so_list_head);
|
|
so_list_head = next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
GLOBAL FUNCTION
|
|
|
|
solib_create_inferior_hook -- shared library startup support
|
|
|
|
SYNOPSIS
|
|
|
|
void solib_create_inferior_hook()
|
|
|
|
DESCRIPTION
|
|
|
|
When gdb starts up the inferior, it nurses it along (through the
|
|
shell) until it is ready to execute it's first instruction. At this
|
|
point, this function gets called via expansion of the macro
|
|
SOLIB_CREATE_INFERIOR_HOOK.
|
|
For a statically bound executable, this first instruction is the
|
|
one at "_start", or a similar text label. No further processing is
|
|
needed in that case.
|
|
For a dynamically bound executable, this first instruction is somewhere
|
|
in the rld, and the actual user executable is not yet mapped in.
|
|
We continue the inferior again, rld then maps in the actual user
|
|
executable and any needed shared libraries and then sends
|
|
itself a SIGTRAP.
|
|
At that point we discover the names of all shared libraries and
|
|
read their symbols in.
|
|
|
|
FIXME
|
|
|
|
This code does not properly handle hitting breakpoints which the
|
|
user might have set in the rld itself. Proper handling would have
|
|
to check if the SIGTRAP happened due to a kill call.
|
|
|
|
Also, what if child has exit()ed? Must exit loop somehow.
|
|
*/
|
|
|
|
void
|
|
solib_create_inferior_hook()
|
|
{
|
|
|
|
/* Nothing to do for statically bound executables. */
|
|
|
|
if (symfile_objfile == 0 || symfile_objfile->ei.entry_file_lowpc == stop_pc)
|
|
return;
|
|
|
|
/* Now run the target. It will eventually get a SIGTRAP, at
|
|
which point all of the libraries will have been mapped in and we
|
|
can go groveling around in the rld structures to find
|
|
out what we need to know about them. */
|
|
|
|
clear_proceed_status ();
|
|
stop_soon_quietly = 1;
|
|
stop_signal = 0;
|
|
do
|
|
{
|
|
target_resume (-1, 0, stop_signal);
|
|
wait_for_inferior ();
|
|
}
|
|
while (stop_signal != SIGTRAP);
|
|
|
|
/* solib_add will call reinit_frame_cache via symbol_file_add.
|
|
But we are stopped in the runtime loader and we do not have symbols
|
|
for the runtime loader. So heuristic_proc_start will be called
|
|
and will put out an annoying warning.
|
|
Resetting stop_soon_quietly after symbol loading suppresses
|
|
the warning. */
|
|
solib_add ((char *) 0, 0, (struct target_ops *) 0);
|
|
stop_soon_quietly = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
sharedlibrary_command -- handle command to explicitly add library
|
|
|
|
SYNOPSIS
|
|
|
|
static void sharedlibrary_command (char *args, int from_tty)
|
|
|
|
DESCRIPTION
|
|
|
|
*/
|
|
|
|
static void
|
|
sharedlibrary_command (args, from_tty)
|
|
char *args;
|
|
int from_tty;
|
|
{
|
|
dont_repeat ();
|
|
solib_add (args, from_tty, (struct target_ops *) 0);
|
|
}
|
|
|
|
void
|
|
_initialize_solib()
|
|
{
|
|
|
|
add_com ("sharedlibrary", class_files, sharedlibrary_command,
|
|
"Load shared object library symbols for files matching REGEXP.");
|
|
add_info ("sharedlibrary", info_sharedlibrary_command,
|
|
"Status of loaded shared object libraries.");
|
|
}
|