e7cf9df194
* symfile.h (struct section_addr_info ): Remove fields for special
treatment of .text, .data and .bss sections.
* solib.c (symbol_add_stub): The special field text_addr is not
available anymore. Search for the .text field the hard way.
* symfile.c (build_section_addr_info_from_section_table): Don't
fill in {text, data, bss}_addr any more.
(default_symfile_offsets): Don't use {text, data, bss}_addr fields
to fill in section_offsets for objfile.
(syms_from_objfile): Don't deal with {text, data, bss}_addr as a
special case anymore.
(add_symbol_file_command): Ditto.
2157 lines
60 KiB
C
2157 lines
60 KiB
C
/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger.
|
|
Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999
|
|
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., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
|
|
#include "defs.h"
|
|
|
|
/* This file is only compilable if link.h is available. */
|
|
|
|
#ifdef HAVE_LINK_H
|
|
|
|
#include <sys/types.h>
|
|
#include <signal.h>
|
|
#include "gdb_string.h"
|
|
#include <sys/param.h>
|
|
#include <fcntl.h>
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
/* SunOS shared libs need the nlist structure. */
|
|
#include <a.out.h>
|
|
#else
|
|
#include "elf/external.h"
|
|
#endif
|
|
|
|
#include <link.h>
|
|
|
|
#include "symtab.h"
|
|
#include "bfd.h"
|
|
#include "symfile.h"
|
|
#include "objfiles.h"
|
|
#include "gdbcore.h"
|
|
#include "command.h"
|
|
#include "target.h"
|
|
#include "frame.h"
|
|
#include "gdb_regex.h"
|
|
#include "inferior.h"
|
|
#include "environ.h"
|
|
#include "language.h"
|
|
#include "gdbcmd.h"
|
|
|
|
#define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */
|
|
|
|
/* On SVR4 systems, a list of symbols in the dynamic linker where
|
|
GDB can try to place a breakpoint to monitor shared library
|
|
events.
|
|
|
|
If none of these symbols are found, or other errors occur, then
|
|
SVR4 systems will fall back to using a symbol as the "startup
|
|
mapping complete" breakpoint address. */
|
|
|
|
#ifdef SVR4_SHARED_LIBS
|
|
static char *solib_break_names[] =
|
|
{
|
|
"r_debug_state",
|
|
"_r_debug_state",
|
|
"_dl_debug_state",
|
|
"rtld_db_dlactivity",
|
|
NULL
|
|
};
|
|
#endif
|
|
|
|
#define BKPT_AT_SYMBOL 1
|
|
|
|
#if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS)
|
|
static char *bkpt_names[] =
|
|
{
|
|
#ifdef SOLIB_BKPT_NAME
|
|
SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */
|
|
#endif
|
|
"_start",
|
|
"main",
|
|
NULL
|
|
};
|
|
#endif
|
|
|
|
/* Symbols which are used to locate the base of the link map structures. */
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
static char *debug_base_symbols[] =
|
|
{
|
|
"_DYNAMIC",
|
|
"_DYNAMIC__MGC",
|
|
NULL
|
|
};
|
|
#endif
|
|
|
|
static char *main_name_list[] =
|
|
{
|
|
"main_$main",
|
|
NULL
|
|
};
|
|
|
|
/* local data declarations */
|
|
|
|
/* Macro to extract an address from a solib structure.
|
|
When GDB is configured for some 32-bit targets (e.g. Solaris 2.7
|
|
sparc), BFD is configured to handle 64-bit targets, so CORE_ADDR is
|
|
64 bits. We have to extract only the significant bits of addresses
|
|
to get the right address when accessing the core file BFD. */
|
|
|
|
#define SOLIB_EXTRACT_ADDRESS(member) \
|
|
extract_address (&member, sizeof (member))
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
#define LM_ADDR(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_addr))
|
|
#define LM_NEXT(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_next))
|
|
#define LM_NAME(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_name))
|
|
/* Test for first link map entry; first entry is a shared library. */
|
|
#define IGNORE_FIRST_LINK_MAP_ENTRY(so) (0)
|
|
static struct link_dynamic dynamic_copy;
|
|
static struct link_dynamic_2 ld_2_copy;
|
|
static struct ld_debug debug_copy;
|
|
static CORE_ADDR debug_addr;
|
|
static CORE_ADDR flag_addr;
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|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
#define LM_ADDR(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_addr))
|
|
#define LM_NEXT(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_next))
|
|
#define LM_NAME(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_name))
|
|
/* Test for first link map entry; first entry is the exec-file. */
|
|
#define IGNORE_FIRST_LINK_MAP_ENTRY(so) \
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|
(SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_prev) == 0)
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static struct r_debug debug_copy;
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|
char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
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|
|
|
#endif /* !SVR4_SHARED_LIBS */
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|
|
|
struct so_list
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|
{
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|
/* The following fields of the structure come directly from the
|
|
dynamic linker's tables in the inferior, and are initialized by
|
|
current_sos. */
|
|
|
|
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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|
CORE_ADDR lmaddr; /* addr in inferior lm was read from */
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|
|
|
/* Shared object file name, exactly as it appears in the
|
|
inferior's link map. This may be a relative path, or something
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|
which needs to be looked up in LD_LIBRARY_PATH, etc. We use it
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|
to tell which entries in the inferior's dynamic linker's link
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|
map we've already loaded. */
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|
char so_original_name[MAX_PATH_SIZE];
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|
|
|
/* shared object file name, expanded to something GDB can open */
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|
char so_name[MAX_PATH_SIZE];
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|
|
|
/* The following fields of the structure are built from
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|
information gathered from the shared object file itself, and
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|
are initialized when we actually add it to our symbol tables. */
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|
|
|
bfd *abfd;
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|
CORE_ADDR lmend; /* upper addr bound of mapped object */
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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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|
};
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|
|
|
static struct so_list *so_list_head; /* List of known shared objects */
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|
static CORE_ADDR debug_base; /* Base of dynamic linker structures */
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static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
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|
|
|
static int solib_cleanup_queued = 0; /* make_run_cleanup called */
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|
|
|
extern int
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|
fdmatch PARAMS ((int, int)); /* In libiberty */
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|
/* Local function prototypes */
|
|
|
|
static void
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|
do_clear_solib PARAMS ((PTR));
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|
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|
static int
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|
match_main PARAMS ((char *));
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|
|
|
static void
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|
special_symbol_handling PARAMS ((void));
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|
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|
static void
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|
sharedlibrary_command PARAMS ((char *, int));
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|
|
|
static int
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|
enable_break PARAMS ((void));
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|
|
|
static void
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|
info_sharedlibrary_command PARAMS ((char *, int));
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|
|
|
static int symbol_add_stub PARAMS ((PTR));
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|
|
|
static CORE_ADDR
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|
first_link_map_member PARAMS ((void));
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|
|
|
static CORE_ADDR
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|
locate_base PARAMS ((void));
|
|
|
|
static int solib_map_sections PARAMS ((PTR));
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|
|
|
#ifdef SVR4_SHARED_LIBS
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|
|
|
static CORE_ADDR
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|
elf_locate_base PARAMS ((void));
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|
|
|
#else
|
|
|
|
static struct so_list *current_sos (void);
|
|
static void free_so (struct so_list *node);
|
|
|
|
static int
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|
disable_break PARAMS ((void));
|
|
|
|
static void
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|
allocate_rt_common_objfile PARAMS ((void));
|
|
|
|
static void
|
|
solib_add_common_symbols (CORE_ADDR);
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|
|
|
#endif
|
|
|
|
void _initialize_solib PARAMS ((void));
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|
|
|
/* If non-zero, this is a prefix that will be added to the front of the name
|
|
shared libraries with an absolute filename for loading. */
|
|
static char *solib_absolute_prefix = NULL;
|
|
|
|
/* If non-empty, this is a search path for loading non-absolute shared library
|
|
symbol files. This takes precedence over the environment variables PATH
|
|
and LD_LIBRARY_PATH. */
|
|
static char *solib_search_path = NULL;
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
solib_map_sections -- open bfd and build sections for shared lib
|
|
|
|
SYNOPSIS
|
|
|
|
static int solib_map_sections (struct so_list *so)
|
|
|
|
DESCRIPTION
|
|
|
|
Given a pointer to one of the shared objects in our list
|
|
of mapped objects, use the recorded name to open a bfd
|
|
descriptor for the object, build a section table, and then
|
|
relocate all the section addresses by the base address at
|
|
which the shared object was mapped.
|
|
|
|
FIXMES
|
|
|
|
In most (all?) cases the shared object file name recorded in the
|
|
dynamic linkage tables will be a fully qualified pathname. For
|
|
cases where it isn't, do we really mimic the systems search
|
|
mechanism correctly in the below code (particularly the tilde
|
|
expansion stuff?).
|
|
*/
|
|
|
|
static int
|
|
solib_map_sections (arg)
|
|
PTR arg;
|
|
{
|
|
struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */
|
|
char *filename;
|
|
char *scratch_pathname;
|
|
int scratch_chan;
|
|
struct section_table *p;
|
|
struct cleanup *old_chain;
|
|
bfd *abfd;
|
|
|
|
filename = tilde_expand (so->so_name);
|
|
|
|
if (solib_absolute_prefix && ROOTED_P (filename))
|
|
/* Prefix shared libraries with absolute filenames with
|
|
SOLIB_ABSOLUTE_PREFIX. */
|
|
{
|
|
char *pfxed_fn;
|
|
int pfx_len;
|
|
|
|
pfx_len = strlen (solib_absolute_prefix);
|
|
|
|
/* Remove trailing slashes. */
|
|
while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1]))
|
|
pfx_len--;
|
|
|
|
pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1);
|
|
strcpy (pfxed_fn, solib_absolute_prefix);
|
|
strcat (pfxed_fn, filename);
|
|
free (filename);
|
|
|
|
filename = pfxed_fn;
|
|
}
|
|
|
|
old_chain = make_cleanup (free, filename);
|
|
|
|
scratch_chan = -1;
|
|
|
|
if (solib_search_path)
|
|
scratch_chan = openp (solib_search_path,
|
|
1, filename, O_RDONLY, 0, &scratch_pathname);
|
|
if (scratch_chan < 0)
|
|
scratch_chan = openp (get_in_environ (inferior_environ, "PATH"),
|
|
1, filename, O_RDONLY, 0, &scratch_pathname);
|
|
if (scratch_chan < 0)
|
|
{
|
|
scratch_chan = openp (get_in_environ
|
|
(inferior_environ, "LD_LIBRARY_PATH"),
|
|
1, filename, O_RDONLY, 0, &scratch_pathname);
|
|
}
|
|
if (scratch_chan < 0)
|
|
{
|
|
perror_with_name (filename);
|
|
}
|
|
/* Leave scratch_pathname allocated. abfd->name will point to it. */
|
|
|
|
abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
|
|
if (!abfd)
|
|
{
|
|
close (scratch_chan);
|
|
error ("Could not open `%s' as an executable file: %s",
|
|
scratch_pathname, bfd_errmsg (bfd_get_error ()));
|
|
}
|
|
/* Leave bfd open, core_xfer_memory and "info files" need it. */
|
|
so->abfd = abfd;
|
|
abfd->cacheable = true;
|
|
|
|
/* copy full path name into so_name, so that later symbol_file_add can find
|
|
it */
|
|
if (strlen (scratch_pathname) >= MAX_PATH_SIZE)
|
|
error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure.");
|
|
strcpy (so->so_name, scratch_pathname);
|
|
|
|
if (!bfd_check_format (abfd, bfd_object))
|
|
{
|
|
error ("\"%s\": not in executable format: %s.",
|
|
scratch_pathname, bfd_errmsg (bfd_get_error ()));
|
|
}
|
|
if (build_section_table (abfd, &so->sections, &so->sections_end))
|
|
{
|
|
error ("Can't find the file sections in `%s': %s",
|
|
bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
|
|
}
|
|
|
|
for (p = so->sections; p < so->sections_end; p++)
|
|
{
|
|
/* Relocate the section binding addresses as recorded in the shared
|
|
object's file by the base address to which the object was actually
|
|
mapped. */
|
|
p->addr += LM_ADDR (so);
|
|
p->endaddr += LM_ADDR (so);
|
|
so->lmend = max (p->endaddr, so->lmend);
|
|
if (STREQ (p->the_bfd_section->name, ".text"))
|
|
{
|
|
so->textsection = p;
|
|
}
|
|
}
|
|
|
|
/* Free the file names, close the file now. */
|
|
do_cleanups (old_chain);
|
|
|
|
return (1);
|
|
}
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
/* Allocate the runtime common object file. */
|
|
|
|
static void
|
|
allocate_rt_common_objfile ()
|
|
{
|
|
struct objfile *objfile;
|
|
struct objfile *last_one;
|
|
|
|
objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
|
|
memset (objfile, 0, sizeof (struct objfile));
|
|
objfile->md = NULL;
|
|
obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0,
|
|
xmalloc, free);
|
|
obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc,
|
|
free);
|
|
obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc,
|
|
free);
|
|
obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc,
|
|
free);
|
|
objfile->name = mstrsave (objfile->md, "rt_common");
|
|
|
|
/* Add this file onto the tail of the linked list of other such files. */
|
|
|
|
objfile->next = NULL;
|
|
if (object_files == NULL)
|
|
object_files = objfile;
|
|
else
|
|
{
|
|
for (last_one = object_files;
|
|
last_one->next;
|
|
last_one = last_one->next);
|
|
last_one->next = objfile;
|
|
}
|
|
|
|
rt_common_objfile = objfile;
|
|
}
|
|
|
|
/* Read all dynamically loaded common symbol definitions from the inferior
|
|
and put them into the minimal symbol table for the runtime common
|
|
objfile. */
|
|
|
|
static void
|
|
solib_add_common_symbols (rtc_symp)
|
|
CORE_ADDR rtc_symp;
|
|
{
|
|
struct rtc_symb inferior_rtc_symb;
|
|
struct nlist inferior_rtc_nlist;
|
|
int len;
|
|
char *name;
|
|
|
|
/* Remove any runtime common symbols from previous runs. */
|
|
|
|
if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count)
|
|
{
|
|
obstack_free (&rt_common_objfile->symbol_obstack, 0);
|
|
obstack_specify_allocation (&rt_common_objfile->symbol_obstack, 0, 0,
|
|
xmalloc, free);
|
|
rt_common_objfile->minimal_symbol_count = 0;
|
|
rt_common_objfile->msymbols = NULL;
|
|
}
|
|
|
|
init_minimal_symbol_collection ();
|
|
make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0);
|
|
|
|
while (rtc_symp)
|
|
{
|
|
read_memory (rtc_symp,
|
|
(char *) &inferior_rtc_symb,
|
|
sizeof (inferior_rtc_symb));
|
|
read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp),
|
|
(char *) &inferior_rtc_nlist,
|
|
sizeof (inferior_rtc_nlist));
|
|
if (inferior_rtc_nlist.n_type == N_COMM)
|
|
{
|
|
/* FIXME: The length of the symbol name is not available, but in the
|
|
current implementation the common symbol is allocated immediately
|
|
behind the name of the symbol. */
|
|
len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx;
|
|
|
|
name = xmalloc (len);
|
|
read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name),
|
|
name, len);
|
|
|
|
/* Allocate the runtime common objfile if necessary. */
|
|
if (rt_common_objfile == NULL)
|
|
allocate_rt_common_objfile ();
|
|
|
|
prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
|
|
mst_bss, rt_common_objfile);
|
|
free (name);
|
|
}
|
|
rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next);
|
|
}
|
|
|
|
/* Install any minimal symbols that have been collected as the current
|
|
minimal symbols for the runtime common objfile. */
|
|
|
|
install_minimal_symbols (rt_common_objfile);
|
|
}
|
|
|
|
#endif /* SVR4_SHARED_LIBS */
|
|
|
|
|
|
#ifdef SVR4_SHARED_LIBS
|
|
|
|
static CORE_ADDR
|
|
bfd_lookup_symbol PARAMS ((bfd *, char *));
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
bfd_lookup_symbol -- lookup the value for a specific symbol
|
|
|
|
SYNOPSIS
|
|
|
|
CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
|
|
|
|
DESCRIPTION
|
|
|
|
An expensive way to lookup the value of a single symbol for
|
|
bfd's that are only temporary anyway. This is used by the
|
|
shared library support to find the address of the debugger
|
|
interface structures in the shared library.
|
|
|
|
Note that 0 is specifically allowed as an error return (no
|
|
such symbol).
|
|
*/
|
|
|
|
static CORE_ADDR
|
|
bfd_lookup_symbol (abfd, symname)
|
|
bfd *abfd;
|
|
char *symname;
|
|
{
|
|
unsigned int storage_needed;
|
|
asymbol *sym;
|
|
asymbol **symbol_table;
|
|
unsigned int number_of_symbols;
|
|
unsigned int i;
|
|
struct cleanup *back_to;
|
|
CORE_ADDR symaddr = 0;
|
|
|
|
storage_needed = bfd_get_symtab_upper_bound (abfd);
|
|
|
|
if (storage_needed > 0)
|
|
{
|
|
symbol_table = (asymbol **) xmalloc (storage_needed);
|
|
back_to = make_cleanup (free, (PTR) symbol_table);
|
|
number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
|
|
|
|
for (i = 0; i < number_of_symbols; i++)
|
|
{
|
|
sym = *symbol_table++;
|
|
if (STREQ (sym->name, symname))
|
|
{
|
|
/* Bfd symbols are section relative. */
|
|
symaddr = sym->value + sym->section->vma;
|
|
break;
|
|
}
|
|
}
|
|
do_cleanups (back_to);
|
|
}
|
|
return (symaddr);
|
|
}
|
|
|
|
#ifdef HANDLE_SVR4_EXEC_EMULATORS
|
|
|
|
/*
|
|
Solaris BCP (the part of Solaris which allows it to run SunOS4
|
|
a.out files) throws in another wrinkle. Solaris does not fill
|
|
in the usual a.out link map structures when running BCP programs,
|
|
the only way to get at them is via groping around in the dynamic
|
|
linker.
|
|
The dynamic linker and it's structures are located in the shared
|
|
C library, which gets run as the executable's "interpreter" by
|
|
the kernel.
|
|
|
|
Note that we can assume nothing about the process state at the time
|
|
we need to find these structures. We may be stopped on the first
|
|
instruction of the interpreter (C shared library), the first
|
|
instruction of the executable itself, or somewhere else entirely
|
|
(if we attached to the process for example).
|
|
*/
|
|
|
|
static char *debug_base_symbols[] =
|
|
{
|
|
"r_debug", /* Solaris 2.3 */
|
|
"_r_debug", /* Solaris 2.1, 2.2 */
|
|
NULL
|
|
};
|
|
|
|
static int
|
|
look_for_base PARAMS ((int, CORE_ADDR));
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
look_for_base -- examine file for each mapped address segment
|
|
|
|
SYNOPSYS
|
|
|
|
static int look_for_base (int fd, CORE_ADDR baseaddr)
|
|
|
|
DESCRIPTION
|
|
|
|
This function is passed to proc_iterate_over_mappings, which
|
|
causes it to get called once for each mapped address space, with
|
|
an open file descriptor for the file mapped to that space, and the
|
|
base address of that mapped space.
|
|
|
|
Our job is to find the debug base symbol in the file that this
|
|
fd is open on, if it exists, and if so, initialize the dynamic
|
|
linker structure base address debug_base.
|
|
|
|
Note that this is a computationally expensive proposition, since
|
|
we basically have to open a bfd on every call, so we specifically
|
|
avoid opening the exec file.
|
|
*/
|
|
|
|
static int
|
|
look_for_base (fd, baseaddr)
|
|
int fd;
|
|
CORE_ADDR baseaddr;
|
|
{
|
|
bfd *interp_bfd;
|
|
CORE_ADDR address = 0;
|
|
char **symbolp;
|
|
|
|
/* If the fd is -1, then there is no file that corresponds to this
|
|
mapped memory segment, so skip it. Also, if the fd corresponds
|
|
to the exec file, skip it as well. */
|
|
|
|
if (fd == -1
|
|
|| (exec_bfd != NULL
|
|
&& fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd)))
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
/* Try to open whatever random file this fd corresponds to. Note that
|
|
we have no way currently to find the filename. Don't gripe about
|
|
any problems we might have, just fail. */
|
|
|
|
if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL)
|
|
{
|
|
return (0);
|
|
}
|
|
if (!bfd_check_format (interp_bfd, bfd_object))
|
|
{
|
|
/* FIXME-leak: on failure, might not free all memory associated with
|
|
interp_bfd. */
|
|
bfd_close (interp_bfd);
|
|
return (0);
|
|
}
|
|
|
|
/* Now try to find our debug base symbol in this file, which we at
|
|
least know to be a valid ELF executable or shared library. */
|
|
|
|
for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
|
|
{
|
|
address = bfd_lookup_symbol (interp_bfd, *symbolp);
|
|
if (address != 0)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
if (address == 0)
|
|
{
|
|
/* FIXME-leak: on failure, might not free all memory associated with
|
|
interp_bfd. */
|
|
bfd_close (interp_bfd);
|
|
return (0);
|
|
}
|
|
|
|
/* Eureka! We found the symbol. But now we may need to relocate it
|
|
by the base address. If the symbol's value is less than the base
|
|
address of the shared library, then it hasn't yet been relocated
|
|
by the dynamic linker, and we have to do it ourself. FIXME: Note
|
|
that we make the assumption that the first segment that corresponds
|
|
to the shared library has the base address to which the library
|
|
was relocated. */
|
|
|
|
if (address < baseaddr)
|
|
{
|
|
address += baseaddr;
|
|
}
|
|
debug_base = address;
|
|
/* FIXME-leak: on failure, might not free all memory associated with
|
|
interp_bfd. */
|
|
bfd_close (interp_bfd);
|
|
return (1);
|
|
}
|
|
#endif /* HANDLE_SVR4_EXEC_EMULATORS */
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
elf_locate_base -- locate the base address of dynamic linker structs
|
|
for SVR4 elf targets.
|
|
|
|
SYNOPSIS
|
|
|
|
CORE_ADDR elf_locate_base (void)
|
|
|
|
DESCRIPTION
|
|
|
|
For SVR4 elf targets the address of the dynamic linker's runtime
|
|
structure is contained within the dynamic info section in the
|
|
executable file. The dynamic section is also mapped into the
|
|
inferior address space. Because the runtime loader fills in the
|
|
real address before starting the inferior, we have to read in the
|
|
dynamic info section from the inferior address space.
|
|
If there are any errors while trying to find the address, we
|
|
silently return 0, otherwise the found address is returned.
|
|
|
|
*/
|
|
|
|
static CORE_ADDR
|
|
elf_locate_base ()
|
|
{
|
|
sec_ptr dyninfo_sect;
|
|
int dyninfo_sect_size;
|
|
CORE_ADDR dyninfo_addr;
|
|
char *buf;
|
|
char *bufend;
|
|
|
|
/* Find the start address of the .dynamic section. */
|
|
dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic");
|
|
if (dyninfo_sect == NULL)
|
|
return 0;
|
|
dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect);
|
|
|
|
/* Read in .dynamic section, silently ignore errors. */
|
|
dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect);
|
|
buf = alloca (dyninfo_sect_size);
|
|
if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size))
|
|
return 0;
|
|
|
|
/* Find the DT_DEBUG entry in the the .dynamic section.
|
|
For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has
|
|
no DT_DEBUG entries. */
|
|
#ifndef TARGET_ELF64
|
|
for (bufend = buf + dyninfo_sect_size;
|
|
buf < bufend;
|
|
buf += sizeof (Elf32_External_Dyn))
|
|
{
|
|
Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf;
|
|
long dyn_tag;
|
|
CORE_ADDR dyn_ptr;
|
|
|
|
dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag);
|
|
if (dyn_tag == DT_NULL)
|
|
break;
|
|
else if (dyn_tag == DT_DEBUG)
|
|
{
|
|
dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
|
|
return dyn_ptr;
|
|
}
|
|
#ifdef DT_MIPS_RLD_MAP
|
|
else if (dyn_tag == DT_MIPS_RLD_MAP)
|
|
{
|
|
char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT];
|
|
|
|
/* DT_MIPS_RLD_MAP contains a pointer to the address
|
|
of the dynamic link structure. */
|
|
dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
|
|
if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf)))
|
|
return 0;
|
|
return extract_unsigned_integer (pbuf, sizeof (pbuf));
|
|
}
|
|
#endif
|
|
}
|
|
#else /* ELF64 */
|
|
for (bufend = buf + dyninfo_sect_size;
|
|
buf < bufend;
|
|
buf += sizeof (Elf64_External_Dyn))
|
|
{
|
|
Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf;
|
|
long dyn_tag;
|
|
CORE_ADDR dyn_ptr;
|
|
|
|
dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag);
|
|
if (dyn_tag == DT_NULL)
|
|
break;
|
|
else if (dyn_tag == DT_DEBUG)
|
|
{
|
|
dyn_ptr = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
|
|
return dyn_ptr;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* DT_DEBUG entry not found. */
|
|
return 0;
|
|
}
|
|
|
|
#endif /* SVR4_SHARED_LIBS */
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
locate_base -- locate the base address of dynamic linker structs
|
|
|
|
SYNOPSIS
|
|
|
|
CORE_ADDR locate_base (void)
|
|
|
|
DESCRIPTION
|
|
|
|
For both the SunOS and SVR4 shared library implementations, if the
|
|
inferior executable has been linked dynamically, there is a single
|
|
address somewhere in the inferior's data space which is the key to
|
|
locating all of the dynamic linker's runtime structures. This
|
|
address is the value of the debug base symbol. The job of this
|
|
function is to find and return that address, or to return 0 if there
|
|
is no such address (the executable is statically linked for example).
|
|
|
|
For SunOS, the job is almost trivial, since the dynamic linker and
|
|
all of it's structures are statically linked to the executable at
|
|
link time. Thus the symbol for the address we are looking for has
|
|
already been added to the minimal symbol table for the executable's
|
|
objfile at the time the symbol file's symbols were read, and all we
|
|
have to do is look it up there. Note that we explicitly do NOT want
|
|
to find the copies in the shared library.
|
|
|
|
The SVR4 version is a bit more complicated because the address
|
|
is contained somewhere in the dynamic info section. We have to go
|
|
to a lot more work to discover the address of the debug base symbol.
|
|
Because of this complexity, we cache the value we find and return that
|
|
value on subsequent invocations. Note there is no copy in the
|
|
executable symbol tables.
|
|
|
|
*/
|
|
|
|
static CORE_ADDR
|
|
locate_base ()
|
|
{
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
struct minimal_symbol *msymbol;
|
|
CORE_ADDR address = 0;
|
|
char **symbolp;
|
|
|
|
/* For SunOS, we want to limit the search for the debug base symbol to the
|
|
executable being debugged, since there is a duplicate named symbol in the
|
|
shared library. We don't want the shared library versions. */
|
|
|
|
for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
|
|
{
|
|
msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile);
|
|
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
|
|
{
|
|
address = SYMBOL_VALUE_ADDRESS (msymbol);
|
|
return (address);
|
|
}
|
|
}
|
|
return (0);
|
|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
/* Check to see if we have a currently valid address, and if so, avoid
|
|
doing all this work again and just return the cached address. If
|
|
we have no cached address, try to locate it in the dynamic info
|
|
section for ELF executables. */
|
|
|
|
if (debug_base == 0)
|
|
{
|
|
if (exec_bfd != NULL
|
|
&& bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour)
|
|
debug_base = elf_locate_base ();
|
|
#ifdef HANDLE_SVR4_EXEC_EMULATORS
|
|
/* Try it the hard way for emulated executables. */
|
|
else if (inferior_pid != 0 && target_has_execution)
|
|
proc_iterate_over_mappings (look_for_base);
|
|
#endif
|
|
}
|
|
return (debug_base);
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
first_link_map_member -- locate first member in dynamic linker's map
|
|
|
|
SYNOPSIS
|
|
|
|
static CORE_ADDR first_link_map_member (void)
|
|
|
|
DESCRIPTION
|
|
|
|
Find the first element in the inferior's dynamic link map, and
|
|
return its address in the inferior. This function doesn't copy the
|
|
link map entry itself into our address space; current_sos actually
|
|
does the reading. */
|
|
|
|
static CORE_ADDR
|
|
first_link_map_member ()
|
|
{
|
|
CORE_ADDR lm = 0;
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy));
|
|
if (dynamic_copy.ld_version >= 2)
|
|
{
|
|
/* It is a version that we can deal with, so read in the secondary
|
|
structure and find the address of the link map list from it. */
|
|
read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2),
|
|
(char *) &ld_2_copy, sizeof (struct link_dynamic_2));
|
|
lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded);
|
|
}
|
|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug));
|
|
/* FIXME: Perhaps we should validate the info somehow, perhaps by
|
|
checking r_version for a known version number, or r_state for
|
|
RT_CONSISTENT. */
|
|
lm = SOLIB_EXTRACT_ADDRESS (debug_copy.r_map);
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
|
|
return (lm);
|
|
}
|
|
|
|
#ifdef SVR4_SHARED_LIBS
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
open_symbol_file_object
|
|
|
|
SYNOPSIS
|
|
|
|
void open_symbol_file_object (int from_tty)
|
|
|
|
DESCRIPTION
|
|
|
|
If no open symbol file, attempt to locate and open the main symbol
|
|
file. On SVR4 systems, this is the first link map entry. If its
|
|
name is here, we can open it. Useful when attaching to a process
|
|
without first loading its symbol file.
|
|
|
|
*/
|
|
|
|
static int
|
|
open_symbol_file_object (from_ttyp)
|
|
int *from_ttyp; /* sneak past catch_errors */
|
|
{
|
|
CORE_ADDR lm;
|
|
struct link_map lmcopy;
|
|
char *filename;
|
|
int errcode;
|
|
|
|
if (symfile_objfile)
|
|
if (!query ("Attempt to reload symbols from process? "))
|
|
return 0;
|
|
|
|
if ((debug_base = locate_base ()) == 0)
|
|
return 0; /* failed somehow... */
|
|
|
|
/* First link map member should be the executable. */
|
|
if ((lm = first_link_map_member ()) == 0)
|
|
return 0; /* failed somehow... */
|
|
|
|
/* Read from target memory to GDB. */
|
|
read_memory (lm, (void *) &lmcopy, sizeof (lmcopy));
|
|
|
|
if (lmcopy.l_name == 0)
|
|
return 0; /* no filename. */
|
|
|
|
/* Now fetch the filename from target memory. */
|
|
target_read_string (SOLIB_EXTRACT_ADDRESS (lmcopy.l_name), &filename,
|
|
MAX_PATH_SIZE - 1, &errcode);
|
|
if (errcode)
|
|
{
|
|
warning ("failed to read exec filename from attached file: %s",
|
|
safe_strerror (errcode));
|
|
return 0;
|
|
}
|
|
|
|
make_cleanup ((make_cleanup_func) free, (void *) filename);
|
|
/* Have a pathname: read the symbol file. */
|
|
symbol_file_command (filename, *from_ttyp);
|
|
|
|
return 1;
|
|
}
|
|
#endif /* SVR4_SHARED_LIBS */
|
|
|
|
|
|
/* LOCAL FUNCTION
|
|
|
|
free_so --- free a `struct so_list' object
|
|
|
|
SYNOPSIS
|
|
|
|
void free_so (struct so_list *so)
|
|
|
|
DESCRIPTION
|
|
|
|
Free the storage associated with the `struct so_list' object SO.
|
|
If we have opened a BFD for SO, close it.
|
|
|
|
The caller is responsible for removing SO from whatever list it is
|
|
a member of. If we have placed SO's sections in some target's
|
|
section table, the caller is responsible for removing them.
|
|
|
|
This function doesn't mess with objfiles at all. If there is an
|
|
objfile associated with SO that needs to be removed, the caller is
|
|
responsible for taking care of that. */
|
|
|
|
static void
|
|
free_so (struct so_list *so)
|
|
{
|
|
char *bfd_filename = 0;
|
|
|
|
if (so->sections)
|
|
free (so->sections);
|
|
|
|
if (so->abfd)
|
|
{
|
|
bfd_filename = bfd_get_filename (so->abfd);
|
|
if (! bfd_close (so->abfd))
|
|
warning ("cannot close \"%s\": %s",
|
|
bfd_filename, bfd_errmsg (bfd_get_error ()));
|
|
}
|
|
|
|
if (bfd_filename)
|
|
free (bfd_filename);
|
|
|
|
free (so);
|
|
}
|
|
|
|
|
|
/* On some systems, the only way to recognize the link map entry for
|
|
the main executable file is by looking at its name. Return
|
|
non-zero iff SONAME matches one of the known main executable names. */
|
|
|
|
static int
|
|
match_main (soname)
|
|
char *soname;
|
|
{
|
|
char **mainp;
|
|
|
|
for (mainp = main_name_list; *mainp != NULL; mainp++)
|
|
{
|
|
if (strcmp (soname, *mainp) == 0)
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
/* LOCAL FUNCTION
|
|
|
|
current_sos -- build a list of currently loaded shared objects
|
|
|
|
SYNOPSIS
|
|
|
|
struct so_list *current_sos ()
|
|
|
|
DESCRIPTION
|
|
|
|
Build a list of `struct so_list' objects describing the shared
|
|
objects currently loaded in the inferior. This list does not
|
|
include an entry for the main executable file.
|
|
|
|
Note that we only gather information directly available from the
|
|
inferior --- we don't examine any of the shared library files
|
|
themselves. The declaration of `struct so_list' says which fields
|
|
we provide values for. */
|
|
|
|
static struct so_list *
|
|
current_sos ()
|
|
{
|
|
CORE_ADDR lm;
|
|
struct so_list *head = 0;
|
|
struct so_list **link_ptr = &head;
|
|
|
|
/* Make sure we've looked up the inferior's dynamic linker's base
|
|
structure. */
|
|
if (! debug_base)
|
|
{
|
|
debug_base = locate_base ();
|
|
|
|
/* If we can't find the dynamic linker's base structure, this
|
|
must not be a dynamically linked executable. Hmm. */
|
|
if (! debug_base)
|
|
return 0;
|
|
}
|
|
|
|
/* Walk the inferior's link map list, and build our list of
|
|
`struct so_list' nodes. */
|
|
lm = first_link_map_member ();
|
|
while (lm)
|
|
{
|
|
struct so_list *new
|
|
= (struct so_list *) xmalloc (sizeof (struct so_list));
|
|
struct cleanup *old_chain = make_cleanup (free, new);
|
|
memset (new, 0, sizeof (*new));
|
|
|
|
new->lmaddr = lm;
|
|
read_memory (lm, (char *) &(new->lm), sizeof (struct link_map));
|
|
|
|
lm = LM_NEXT (new);
|
|
|
|
/* For SVR4 versions, the first entry in the link map is for the
|
|
inferior executable, so we must ignore it. For some versions of
|
|
SVR4, it has no name. For others (Solaris 2.3 for example), it
|
|
does have a name, so we can no longer use a missing name to
|
|
decide when to ignore it. */
|
|
if (IGNORE_FIRST_LINK_MAP_ENTRY (new))
|
|
free_so (new);
|
|
else
|
|
{
|
|
int errcode;
|
|
char *buffer;
|
|
|
|
/* Extract this shared object's name. */
|
|
target_read_string (LM_NAME (new), &buffer,
|
|
MAX_PATH_SIZE - 1, &errcode);
|
|
if (errcode != 0)
|
|
{
|
|
warning ("current_sos: Can't read pathname for load map: %s\n",
|
|
safe_strerror (errcode));
|
|
}
|
|
else
|
|
{
|
|
strncpy (new->so_name, buffer, MAX_PATH_SIZE - 1);
|
|
new->so_name[MAX_PATH_SIZE - 1] = '\0';
|
|
free (buffer);
|
|
strcpy (new->so_original_name, new->so_name);
|
|
}
|
|
|
|
/* If this entry has no name, or its name matches the name
|
|
for the main executable, don't include it in the list. */
|
|
if (! new->so_name[0]
|
|
|| match_main (new->so_name))
|
|
free_so (new);
|
|
else
|
|
{
|
|
new->next = 0;
|
|
*link_ptr = new;
|
|
link_ptr = &new->next;
|
|
}
|
|
}
|
|
|
|
discard_cleanups (old_chain);
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
|
|
/* A small stub to get us past the arg-passing pinhole of catch_errors. */
|
|
|
|
static int
|
|
symbol_add_stub (arg)
|
|
PTR arg;
|
|
{
|
|
register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
|
|
CORE_ADDR text_addr = 0;
|
|
struct section_addr_info *sap;
|
|
int i;
|
|
asection *text_section;
|
|
|
|
/* Have we already loaded this shared object? */
|
|
ALL_OBJFILES (so->objfile)
|
|
{
|
|
if (strcmp (so->objfile->name, so->so_name) == 0)
|
|
return 1;
|
|
}
|
|
|
|
/* Find the shared object's text segment. */
|
|
if (so->textsection)
|
|
text_addr = so->textsection->addr;
|
|
else if (so->abfd != NULL)
|
|
{
|
|
asection *lowest_sect;
|
|
|
|
/* If we didn't find a mapped non zero sized .text section, set up
|
|
text_addr so that the relocation in symbol_file_add does no harm. */
|
|
lowest_sect = bfd_get_section_by_name (so->abfd, ".text");
|
|
if (lowest_sect == NULL)
|
|
bfd_map_over_sections (so->abfd, find_lowest_section,
|
|
(PTR) &lowest_sect);
|
|
if (lowest_sect)
|
|
text_addr = bfd_section_vma (so->abfd, lowest_sect)
|
|
+ LM_ADDR (so);
|
|
}
|
|
|
|
sap = build_section_addr_info_from_section_table (so->sections,
|
|
so->sections_end);
|
|
|
|
/* Look for the index for the .text section in the sap structure. */
|
|
text_section = bfd_get_section_by_name (so->abfd, ".text");
|
|
for (i = 0; i < MAX_SECTIONS && sap->other[i].name; i++)
|
|
if (sap->other[i].sectindex == text_section->index)
|
|
break;
|
|
|
|
sap->other[i].addr = text_addr;
|
|
so->objfile = symbol_file_add (so->so_name, so->from_tty,
|
|
sap, 0, OBJF_SHARED);
|
|
free_section_addr_info (sap);
|
|
|
|
return (1);
|
|
}
|
|
|
|
|
|
/* LOCAL FUNCTION
|
|
|
|
update_solib_list --- synchronize GDB's shared object list with inferior's
|
|
|
|
SYNOPSIS
|
|
|
|
void update_solib_list (int from_tty, struct target_ops *TARGET)
|
|
|
|
Extract the list of currently loaded shared objects from the
|
|
inferior, and compare it with the list of shared objects currently
|
|
in GDB's so_list_head list. Edit so_list_head to bring it in sync
|
|
with the inferior's new list.
|
|
|
|
If we notice that the inferior has unloaded some shared objects,
|
|
free any symbolic info GDB had read about those shared objects.
|
|
|
|
Don't load symbolic info for any new shared objects; just add them
|
|
to the list, and leave their symbols_loaded flag clear.
|
|
|
|
If FROM_TTY is non-null, feel free to print messages about what
|
|
we're doing.
|
|
|
|
If TARGET is non-null, add the sections of all new shared objects
|
|
to TARGET's section table. Note that this doesn't remove any
|
|
sections for shared objects that have been unloaded, and it
|
|
doesn't check to see if the new shared objects are already present in
|
|
the section table. But we only use this for core files and
|
|
processes we've just attached to, so that's okay. */
|
|
|
|
void
|
|
update_solib_list (int from_tty, struct target_ops *target)
|
|
{
|
|
struct so_list *inferior = current_sos ();
|
|
struct so_list *gdb, **gdb_link;
|
|
|
|
#ifdef SVR4_SHARED_LIBS
|
|
/* If we are attaching to a running process for which we
|
|
have not opened a symbol file, we may be able to get its
|
|
symbols now! */
|
|
if (attach_flag &&
|
|
symfile_objfile == NULL)
|
|
catch_errors (open_symbol_file_object, (PTR) &from_tty,
|
|
"Error reading attached process's symbol file.\n",
|
|
RETURN_MASK_ALL);
|
|
|
|
#endif SVR4_SHARED_LIBS
|
|
|
|
/* Since this function might actually add some elements to the
|
|
so_list_head list, arrange for it to be cleaned up when
|
|
appropriate. */
|
|
if (!solib_cleanup_queued)
|
|
{
|
|
make_run_cleanup (do_clear_solib, NULL);
|
|
solib_cleanup_queued = 1;
|
|
}
|
|
|
|
/* GDB and the inferior's dynamic linker each maintain their own
|
|
list of currently loaded shared objects; we want to bring the
|
|
former in sync with the latter. Scan both lists, seeing which
|
|
shared objects appear where. There are three cases:
|
|
|
|
- A shared object appears on both lists. This means that GDB
|
|
knows about it already, and it's still loaded in the inferior.
|
|
Nothing needs to happen.
|
|
|
|
- A shared object appears only on GDB's list. This means that
|
|
the inferior has unloaded it. We should remove the shared
|
|
object from GDB's tables.
|
|
|
|
- A shared object appears only on the inferior's list. This
|
|
means that it's just been loaded. We should add it to GDB's
|
|
tables.
|
|
|
|
So we walk GDB's list, checking each entry to see if it appears
|
|
in the inferior's list too. If it does, no action is needed, and
|
|
we remove it from the inferior's list. If it doesn't, the
|
|
inferior has unloaded it, and we remove it from GDB's list. By
|
|
the time we're done walking GDB's list, the inferior's list
|
|
contains only the new shared objects, which we then add. */
|
|
|
|
gdb = so_list_head;
|
|
gdb_link = &so_list_head;
|
|
while (gdb)
|
|
{
|
|
struct so_list *i = inferior;
|
|
struct so_list **i_link = &inferior;
|
|
|
|
/* Check to see whether the shared object *gdb also appears in
|
|
the inferior's current list. */
|
|
while (i)
|
|
{
|
|
if (! strcmp (gdb->so_original_name, i->so_original_name))
|
|
break;
|
|
|
|
i_link = &i->next;
|
|
i = *i_link;
|
|
}
|
|
|
|
/* If the shared object appears on the inferior's list too, then
|
|
it's still loaded, so we don't need to do anything. Delete
|
|
it from the inferior's list, and leave it on GDB's list. */
|
|
if (i)
|
|
{
|
|
*i_link = i->next;
|
|
free_so (i);
|
|
gdb_link = &gdb->next;
|
|
gdb = *gdb_link;
|
|
}
|
|
|
|
/* If it's not on the inferior's list, remove it from GDB's tables. */
|
|
else
|
|
{
|
|
*gdb_link = gdb->next;
|
|
|
|
/* Unless the user loaded it explicitly, free SO's objfile. */
|
|
if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED))
|
|
free_objfile (gdb->objfile);
|
|
|
|
/* Some targets' section tables might be referring to
|
|
sections from so->abfd; remove them. */
|
|
remove_target_sections (gdb->abfd);
|
|
|
|
free_so (gdb);
|
|
gdb = *gdb_link;
|
|
}
|
|
}
|
|
|
|
/* Now the inferior's list contains only shared objects that don't
|
|
appear in GDB's list --- those that are newly loaded. Add them
|
|
to GDB's shared object list. */
|
|
if (inferior)
|
|
{
|
|
struct so_list *i;
|
|
|
|
/* Add the new shared objects to GDB's list. */
|
|
*gdb_link = inferior;
|
|
|
|
/* Fill in the rest of each of the `struct so_list' nodes. */
|
|
for (i = inferior; i; i = i->next)
|
|
{
|
|
i->from_tty = from_tty;
|
|
|
|
/* Fill in the rest of the `struct so_list' node. */
|
|
catch_errors (solib_map_sections, i,
|
|
"Error while mapping shared library sections:\n",
|
|
RETURN_MASK_ALL);
|
|
}
|
|
|
|
/* If requested, add the shared objects' sections to the the
|
|
TARGET's section table. */
|
|
if (target)
|
|
{
|
|
int new_sections;
|
|
|
|
/* Figure out how many sections we'll need to add in total. */
|
|
new_sections = 0;
|
|
for (i = inferior; i; i = i->next)
|
|
new_sections += (i->sections_end - i->sections);
|
|
|
|
if (new_sections > 0)
|
|
{
|
|
int space = target_resize_to_sections (target, new_sections);
|
|
|
|
for (i = inferior; i; i = i->next)
|
|
{
|
|
int count = (i->sections_end - i->sections);
|
|
memcpy (target->to_sections + space,
|
|
i->sections,
|
|
count * sizeof (i->sections[0]));
|
|
space += count;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* GLOBAL FUNCTION
|
|
|
|
solib_add -- read in symbol info for newly added shared libraries
|
|
|
|
SYNOPSIS
|
|
|
|
void solib_add (char *pattern, int from_tty, struct target_ops *TARGET)
|
|
|
|
DESCRIPTION
|
|
|
|
Read in symbolic information for any shared objects whose names
|
|
match PATTERN. (If we've already read a shared object's symbol
|
|
info, leave it alone.) If PATTERN is zero, read them all.
|
|
|
|
FROM_TTY and TARGET are as described for update_solib_list, above. */
|
|
|
|
void
|
|
solib_add (char *pattern, int from_tty, struct target_ops *target)
|
|
{
|
|
struct so_list *gdb;
|
|
|
|
if (pattern)
|
|
{
|
|
char *re_err = re_comp (pattern);
|
|
|
|
if (re_err)
|
|
error ("Invalid regexp: %s", re_err);
|
|
}
|
|
|
|
update_solib_list (from_tty, target);
|
|
|
|
/* Walk the list of currently loaded shared libraries, and read
|
|
symbols for any that match the pattern --- or any whose symbols
|
|
aren't already loaded, if no pattern was given. */
|
|
{
|
|
int any_matches = 0;
|
|
int loaded_any_symbols = 0;
|
|
|
|
for (gdb = so_list_head; gdb; gdb = gdb->next)
|
|
if (! pattern || re_exec (gdb->so_name))
|
|
{
|
|
any_matches = 1;
|
|
|
|
if (gdb->symbols_loaded)
|
|
{
|
|
if (from_tty)
|
|
printf_unfiltered ("Symbols already loaded for %s\n",
|
|
gdb->so_name);
|
|
}
|
|
else
|
|
{
|
|
if (catch_errors
|
|
(symbol_add_stub, gdb,
|
|
"Error while reading shared library symbols:\n",
|
|
RETURN_MASK_ALL))
|
|
{
|
|
if (from_tty)
|
|
printf_unfiltered ("Loaded symbols for %s\n",
|
|
gdb->so_name);
|
|
gdb->symbols_loaded = 1;
|
|
loaded_any_symbols = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (from_tty && pattern && ! any_matches)
|
|
printf_unfiltered
|
|
("No loaded shared libraries match the pattern `%s'.\n", pattern);
|
|
|
|
if (loaded_any_symbols)
|
|
{
|
|
/* Getting new symbols may change our opinion about what is
|
|
frameless. */
|
|
reinit_frame_cache ();
|
|
|
|
special_symbol_handling ();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
|
|
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;
|
|
int addr_width;
|
|
char *addr_fmt;
|
|
|
|
if (exec_bfd == NULL)
|
|
{
|
|
printf_unfiltered ("No executable file.\n");
|
|
return;
|
|
}
|
|
|
|
#ifndef TARGET_ELF64
|
|
addr_width = 8 + 4;
|
|
addr_fmt = "08l";
|
|
#else
|
|
addr_width = 16 + 4;
|
|
addr_fmt = "016l";
|
|
#endif
|
|
|
|
update_solib_list (from_tty, 0);
|
|
|
|
for (so = so_list_head; so; so = so->next)
|
|
{
|
|
if (so->so_name[0])
|
|
{
|
|
if (!header_done)
|
|
{
|
|
printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From",
|
|
addr_width, "To", "Syms Read",
|
|
"Shared Object Library");
|
|
header_done++;
|
|
}
|
|
|
|
printf_unfiltered ("%-*s", addr_width,
|
|
local_hex_string_custom ((unsigned long) LM_ADDR (so),
|
|
addr_fmt));
|
|
printf_unfiltered ("%-*s", addr_width,
|
|
local_hex_string_custom ((unsigned long) so->lmend,
|
|
addr_fmt));
|
|
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
|
|
|
|
char * 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.
|
|
*/
|
|
|
|
char *
|
|
solib_address (address)
|
|
CORE_ADDR address;
|
|
{
|
|
register struct so_list *so = 0; /* link map state variable */
|
|
|
|
for (so = so_list_head; so; so = so->next)
|
|
{
|
|
if (LM_ADDR (so) <= address && address < so->lmend)
|
|
return (so->so_name);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Called by free_all_symtabs */
|
|
|
|
void
|
|
clear_solib ()
|
|
{
|
|
/* This function is expected to handle ELF shared libraries. It is
|
|
also used on Solaris, which can run either ELF or a.out binaries
|
|
(for compatibility with SunOS 4), both of which can use shared
|
|
libraries. So we don't know whether we have an ELF executable or
|
|
an a.out executable until the user chooses an executable file.
|
|
|
|
ELF shared libraries don't get mapped into the address space
|
|
until after the program starts, so we'd better not try to insert
|
|
breakpoints in them immediately. We have to wait until the
|
|
dynamic linker has loaded them; we'll hit a bp_shlib_event
|
|
breakpoint (look for calls to create_solib_event_breakpoint) when
|
|
it's ready.
|
|
|
|
SunOS shared libraries seem to be different --- they're present
|
|
as soon as the process begins execution, so there's no need to
|
|
put off inserting breakpoints. There's also nowhere to put a
|
|
bp_shlib_event breakpoint, so if we put it off, we'll never get
|
|
around to it.
|
|
|
|
So: disable breakpoints only if we're using ELF shared libs. */
|
|
if (exec_bfd != NULL
|
|
&& bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour)
|
|
disable_breakpoints_in_shlibs (1);
|
|
|
|
while (so_list_head)
|
|
{
|
|
struct so_list *so = so_list_head;
|
|
so_list_head = so->next;
|
|
free_so (so);
|
|
}
|
|
|
|
debug_base = 0;
|
|
}
|
|
|
|
static void
|
|
do_clear_solib (dummy)
|
|
PTR dummy;
|
|
{
|
|
solib_cleanup_queued = 0;
|
|
clear_solib ();
|
|
}
|
|
|
|
#ifdef SVR4_SHARED_LIBS
|
|
|
|
/* Return 1 if PC lies in the dynamic symbol resolution code of the
|
|
SVR4 run time loader. */
|
|
|
|
static CORE_ADDR interp_text_sect_low;
|
|
static CORE_ADDR interp_text_sect_high;
|
|
static CORE_ADDR interp_plt_sect_low;
|
|
static CORE_ADDR interp_plt_sect_high;
|
|
|
|
int
|
|
in_svr4_dynsym_resolve_code (pc)
|
|
CORE_ADDR pc;
|
|
{
|
|
return ((pc >= interp_text_sect_low && pc < interp_text_sect_high)
|
|
|| (pc >= interp_plt_sect_low && pc < interp_plt_sect_high)
|
|
|| in_plt_section (pc, NULL));
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
disable_break -- remove the "mapping changed" breakpoint
|
|
|
|
SYNOPSIS
|
|
|
|
static int disable_break ()
|
|
|
|
DESCRIPTION
|
|
|
|
Removes the breakpoint that gets hit when the dynamic linker
|
|
completes a mapping change.
|
|
|
|
*/
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
static int
|
|
disable_break ()
|
|
{
|
|
int status = 1;
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
int in_debugger = 0;
|
|
|
|
/* Read the debugger structure from the inferior to retrieve the
|
|
address of the breakpoint and the original contents of the
|
|
breakpoint address. Remove the breakpoint by writing the original
|
|
contents back. */
|
|
|
|
read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy));
|
|
|
|
/* Set `in_debugger' to zero now. */
|
|
|
|
write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
|
|
|
|
breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr);
|
|
write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst,
|
|
sizeof (debug_copy.ldd_bp_inst));
|
|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
/* Note that breakpoint address and original contents are in our address
|
|
space, so we just need to write the original contents back. */
|
|
|
|
if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
|
|
{
|
|
status = 0;
|
|
}
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
|
|
/* For the SVR4 version, we always know the breakpoint address. For the
|
|
SunOS version we don't know it until the above code is executed.
|
|
Grumble if we are stopped anywhere besides the breakpoint address. */
|
|
|
|
if (stop_pc != breakpoint_addr)
|
|
{
|
|
warning ("stopped at unknown breakpoint while handling shared libraries");
|
|
}
|
|
|
|
return (status);
|
|
}
|
|
|
|
#endif /* #ifdef SVR4_SHARED_LIBS */
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
enable_break -- arrange for dynamic linker to hit breakpoint
|
|
|
|
SYNOPSIS
|
|
|
|
int enable_break (void)
|
|
|
|
DESCRIPTION
|
|
|
|
Both the SunOS and the SVR4 dynamic linkers have, as part of their
|
|
debugger interface, support for arranging for the inferior to hit
|
|
a breakpoint after mapping in the shared libraries. This function
|
|
enables that breakpoint.
|
|
|
|
For SunOS, there is a special flag location (in_debugger) which we
|
|
set to 1. When the dynamic linker sees this flag set, it will set
|
|
a breakpoint at a location known only to itself, after saving the
|
|
original contents of that place and the breakpoint address itself,
|
|
in it's own internal structures. When we resume the inferior, it
|
|
will eventually take a SIGTRAP when it runs into the breakpoint.
|
|
We handle this (in a different place) by restoring the contents of
|
|
the breakpointed location (which is only known after it stops),
|
|
chasing around to locate the shared libraries that have been
|
|
loaded, then resuming.
|
|
|
|
For SVR4, the debugger interface structure contains a member (r_brk)
|
|
which is statically initialized at the time the shared library is
|
|
built, to the offset of a function (_r_debug_state) which is guaran-
|
|
teed to be called once before mapping in a library, and again when
|
|
the mapping is complete. At the time we are examining this member,
|
|
it contains only the unrelocated offset of the function, so we have
|
|
to do our own relocation. Later, when the dynamic linker actually
|
|
runs, it relocates r_brk to be the actual address of _r_debug_state().
|
|
|
|
The debugger interface structure also contains an enumeration which
|
|
is set to either RT_ADD or RT_DELETE prior to changing the mapping,
|
|
depending upon whether or not the library is being mapped or unmapped,
|
|
and then set to RT_CONSISTENT after the library is mapped/unmapped.
|
|
*/
|
|
|
|
static int
|
|
enable_break ()
|
|
{
|
|
int success = 0;
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
int j;
|
|
int in_debugger;
|
|
|
|
/* Get link_dynamic structure */
|
|
|
|
j = target_read_memory (debug_base, (char *) &dynamic_copy,
|
|
sizeof (dynamic_copy));
|
|
if (j)
|
|
{
|
|
/* unreadable */
|
|
return (0);
|
|
}
|
|
|
|
/* Calc address of debugger interface structure */
|
|
|
|
debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd);
|
|
|
|
/* Calc address of `in_debugger' member of debugger interface structure */
|
|
|
|
flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger -
|
|
(char *) &debug_copy);
|
|
|
|
/* Write a value of 1 to this member. */
|
|
|
|
in_debugger = 1;
|
|
write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
|
|
success = 1;
|
|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
#ifdef BKPT_AT_SYMBOL
|
|
|
|
struct minimal_symbol *msymbol;
|
|
char **bkpt_namep;
|
|
asection *interp_sect;
|
|
|
|
/* First, remove all the solib event breakpoints. Their addresses
|
|
may have changed since the last time we ran the program. */
|
|
remove_solib_event_breakpoints ();
|
|
|
|
#ifdef SVR4_SHARED_LIBS
|
|
interp_text_sect_low = interp_text_sect_high = 0;
|
|
interp_plt_sect_low = interp_plt_sect_high = 0;
|
|
|
|
/* Find the .interp section; if not found, warn the user and drop
|
|
into the old breakpoint at symbol code. */
|
|
interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
|
|
if (interp_sect)
|
|
{
|
|
unsigned int interp_sect_size;
|
|
char *buf;
|
|
CORE_ADDR load_addr;
|
|
bfd *tmp_bfd;
|
|
CORE_ADDR sym_addr = 0;
|
|
|
|
/* Read the contents of the .interp section into a local buffer;
|
|
the contents specify the dynamic linker this program uses. */
|
|
interp_sect_size = bfd_section_size (exec_bfd, interp_sect);
|
|
buf = alloca (interp_sect_size);
|
|
bfd_get_section_contents (exec_bfd, interp_sect,
|
|
buf, 0, interp_sect_size);
|
|
|
|
/* Now we need to figure out where the dynamic linker was
|
|
loaded so that we can load its symbols and place a breakpoint
|
|
in the dynamic linker itself.
|
|
|
|
This address is stored on the stack. However, I've been unable
|
|
to find any magic formula to find it for Solaris (appears to
|
|
be trivial on GNU/Linux). Therefore, we have to try an alternate
|
|
mechanism to find the dynamic linker's base address. */
|
|
tmp_bfd = bfd_openr (buf, gnutarget);
|
|
if (tmp_bfd == NULL)
|
|
goto bkpt_at_symbol;
|
|
|
|
/* Make sure the dynamic linker's really a useful object. */
|
|
if (!bfd_check_format (tmp_bfd, bfd_object))
|
|
{
|
|
warning ("Unable to grok dynamic linker %s as an object file", buf);
|
|
bfd_close (tmp_bfd);
|
|
goto bkpt_at_symbol;
|
|
}
|
|
|
|
/* We find the dynamic linker's base address by examining the
|
|
current pc (which point at the entry point for the dynamic
|
|
linker) and subtracting the offset of the entry point. */
|
|
load_addr = read_pc () - tmp_bfd->start_address;
|
|
|
|
/* Record the relocated start and end address of the dynamic linker
|
|
text and plt section for in_svr4_dynsym_resolve_code. */
|
|
interp_sect = bfd_get_section_by_name (tmp_bfd, ".text");
|
|
if (interp_sect)
|
|
{
|
|
interp_text_sect_low =
|
|
bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
|
|
interp_text_sect_high =
|
|
interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect);
|
|
}
|
|
interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt");
|
|
if (interp_sect)
|
|
{
|
|
interp_plt_sect_low =
|
|
bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
|
|
interp_plt_sect_high =
|
|
interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect);
|
|
}
|
|
|
|
/* Now try to set a breakpoint in the dynamic linker. */
|
|
for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++)
|
|
{
|
|
sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep);
|
|
if (sym_addr != 0)
|
|
break;
|
|
}
|
|
|
|
/* We're done with the temporary bfd. */
|
|
bfd_close (tmp_bfd);
|
|
|
|
if (sym_addr != 0)
|
|
{
|
|
create_solib_event_breakpoint (load_addr + sym_addr);
|
|
return 1;
|
|
}
|
|
|
|
/* For whatever reason we couldn't set a breakpoint in the dynamic
|
|
linker. Warn and drop into the old code. */
|
|
bkpt_at_symbol:
|
|
warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code.");
|
|
}
|
|
#endif
|
|
|
|
/* Scan through the list of symbols, trying to look up the symbol and
|
|
set a breakpoint there. Terminate loop when we/if we succeed. */
|
|
|
|
breakpoint_addr = 0;
|
|
for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++)
|
|
{
|
|
msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile);
|
|
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
|
|
{
|
|
create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol));
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* Nothing good happened. */
|
|
success = 0;
|
|
|
|
#endif /* BKPT_AT_SYMBOL */
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
|
|
return (success);
|
|
}
|
|
|
|
/*
|
|
|
|
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 SunOS executables, this first instruction is typically the
|
|
one at "_start", or a similar text label, regardless of whether
|
|
the executable is statically or dynamically linked. The runtime
|
|
startup code takes care of dynamically linking in any shared
|
|
libraries, once gdb allows the inferior to continue.
|
|
|
|
For SVR4 executables, this first instruction is either the first
|
|
instruction in the dynamic linker (for dynamically linked
|
|
executables) or the instruction at "start" for statically linked
|
|
executables. For dynamically linked executables, the system
|
|
first exec's /lib/libc.so.N, which contains the dynamic linker,
|
|
and starts it running. The dynamic linker maps in any needed
|
|
shared libraries, maps in the actual user executable, and then
|
|
jumps to "start" in the user executable.
|
|
|
|
For both SunOS shared libraries, and SVR4 shared libraries, we
|
|
can arrange to cooperate with the dynamic linker to discover the
|
|
names of shared libraries that are dynamically linked, and the
|
|
base addresses to which they are linked.
|
|
|
|
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.
|
|
|
|
FIXME
|
|
|
|
Between enable_break() and disable_break(), this code does not
|
|
properly handle hitting breakpoints which the user might have
|
|
set in the startup code or in the dynamic linker itself. Proper
|
|
handling will probably have to wait until the implementation is
|
|
changed to use the "breakpoint handler function" method.
|
|
|
|
Also, what if child has exit()ed? Must exit loop somehow.
|
|
*/
|
|
|
|
void
|
|
solib_create_inferior_hook ()
|
|
{
|
|
/* If we are using the BKPT_AT_SYMBOL code, then we don't need the base
|
|
yet. In fact, in the case of a SunOS4 executable being run on
|
|
Solaris, we can't get it yet. current_sos will get it when it needs
|
|
it. */
|
|
#if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL))
|
|
if ((debug_base = locate_base ()) == 0)
|
|
{
|
|
/* Can't find the symbol or the executable is statically linked. */
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
if (!enable_break ())
|
|
{
|
|
warning ("shared library handler failed to enable breakpoint");
|
|
return;
|
|
}
|
|
|
|
#if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS)
|
|
/* SCO and SunOS need the loop below, other systems should be using the
|
|
special shared library breakpoints and the shared library breakpoint
|
|
service routine.
|
|
|
|
Now run the target. It will eventually hit the breakpoint, at
|
|
which point all of the libraries will have been mapped in and we
|
|
can go groveling around in the dynamic linker structures to find
|
|
out what we need to know about them. */
|
|
|
|
clear_proceed_status ();
|
|
stop_soon_quietly = 1;
|
|
stop_signal = TARGET_SIGNAL_0;
|
|
do
|
|
{
|
|
target_resume (-1, 0, stop_signal);
|
|
wait_for_inferior ();
|
|
}
|
|
while (stop_signal != TARGET_SIGNAL_TRAP);
|
|
stop_soon_quietly = 0;
|
|
|
|
#if !defined(_SCO_DS)
|
|
/* We are now either at the "mapping complete" breakpoint (or somewhere
|
|
else, a condition we aren't prepared to deal with anyway), so adjust
|
|
the PC as necessary after a breakpoint, disable the breakpoint, and
|
|
add any shared libraries that were mapped in. */
|
|
|
|
if (DECR_PC_AFTER_BREAK)
|
|
{
|
|
stop_pc -= DECR_PC_AFTER_BREAK;
|
|
write_register (PC_REGNUM, stop_pc);
|
|
}
|
|
|
|
if (!disable_break ())
|
|
{
|
|
warning ("shared library handler failed to disable breakpoint");
|
|
}
|
|
|
|
if (auto_solib_add)
|
|
solib_add ((char *) 0, 0, (struct target_ops *) 0);
|
|
#endif /* ! _SCO_DS */
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
special_symbol_handling -- additional shared library symbol handling
|
|
|
|
SYNOPSIS
|
|
|
|
void special_symbol_handling ()
|
|
|
|
DESCRIPTION
|
|
|
|
Once the symbols from a shared object have been loaded in the usual
|
|
way, we are called to do any system specific symbol handling that
|
|
is needed.
|
|
|
|
For SunOS4, this consists of grunging around in the dynamic
|
|
linkers structures to find symbol definitions for "common" symbols
|
|
and adding them to the minimal symbol table for the runtime common
|
|
objfile.
|
|
|
|
*/
|
|
|
|
static void
|
|
special_symbol_handling ()
|
|
{
|
|
#ifndef SVR4_SHARED_LIBS
|
|
int j;
|
|
|
|
if (debug_addr == 0)
|
|
{
|
|
/* Get link_dynamic structure */
|
|
|
|
j = target_read_memory (debug_base, (char *) &dynamic_copy,
|
|
sizeof (dynamic_copy));
|
|
if (j)
|
|
{
|
|
/* unreadable */
|
|
return;
|
|
}
|
|
|
|
/* Calc address of debugger interface structure */
|
|
/* FIXME, this needs work for cross-debugging of core files
|
|
(byteorder, size, alignment, etc). */
|
|
|
|
debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd);
|
|
}
|
|
|
|
/* Read the debugger structure from the inferior, just to make sure
|
|
we have a current copy. */
|
|
|
|
j = target_read_memory (debug_addr, (char *) &debug_copy,
|
|
sizeof (debug_copy));
|
|
if (j)
|
|
return; /* unreadable */
|
|
|
|
/* Get common symbol definitions for the loaded object. */
|
|
|
|
if (debug_copy.ldd_cp)
|
|
{
|
|
solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp));
|
|
}
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
}
|
|
|
|
|
|
/*
|
|
|
|
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);
|
|
}
|
|
|
|
#endif /* HAVE_LINK_H */
|
|
|
|
void
|
|
_initialize_solib ()
|
|
{
|
|
#ifdef HAVE_LINK_H
|
|
|
|
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.");
|
|
|
|
add_show_from_set
|
|
(add_set_cmd ("auto-solib-add", class_support, var_zinteger,
|
|
(char *) &auto_solib_add,
|
|
"Set autoloading of shared library symbols.\n\
|
|
If nonzero, symbols from all shared object libraries will be loaded\n\
|
|
automatically when the inferior begins execution or when the dynamic linker\n\
|
|
informs gdb that a new library has been loaded. Otherwise, symbols\n\
|
|
must be loaded manually, using `sharedlibrary'.",
|
|
&setlist),
|
|
&showlist);
|
|
|
|
add_show_from_set
|
|
(add_set_cmd ("solib-absolute-prefix", class_support, var_filename,
|
|
(char *) &solib_absolute_prefix,
|
|
"Set prefix for loading absolute shared library symbol files.\n\
|
|
For other (relative) files, you can add values using `set solib-search-path'.",
|
|
&setlist),
|
|
&showlist);
|
|
add_show_from_set
|
|
(add_set_cmd ("solib-search-path", class_support, var_string,
|
|
(char *) &solib_search_path,
|
|
"Set the search path for loading non-absolute shared library symbol files.\n\
|
|
This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.",
|
|
&setlist),
|
|
&showlist);
|
|
|
|
#endif /* HAVE_LINK_H */
|
|
}
|