/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger.
- Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
-
-This file is part of GDB.
+ Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999
+ Free Software Foundation, Inc.
-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 file is part of GDB.
-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.
+ 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.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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 <string.h>
-#include <link.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>
+#include <a.out.h>
+#else
+#include "elf/external.h"
#endif
+#include <link.h>
+
#include "symtab.h"
#include "bfd.h"
#include "symfile.h"
#include "command.h"
#include "target.h"
#include "frame.h"
-#include "regex.h"
+#include "gdb_regex.h"
#include "inferior.h"
+#include "environ.h"
#include "language.h"
+#include "gdbcmd.h"
-#define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */
+#define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */
-/* On SVR4 systems, for the initial implementation, use some runtime startup
- symbol as the "startup mapping complete" breakpoint address. The models
- for SunOS and SVR4 dynamic linking debugger support are different in that
- SunOS hits one breakpoint when all mapping is complete while using the SVR4
- debugger support takes two breakpoint hits for each file mapped, and
- there is no way to know when the "last" one is hit. Both these
- mechanisms should be tied to a "breakpoint service routine" that
- gets automatically executed whenever one of the breakpoints indicating
- a change in mapping is hit. This is a future enhancement. (FIXME) */
+/* 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[] = {
+static char *bkpt_names[] =
+{
#ifdef SOLIB_BKPT_NAME
SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */
#endif
};
#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 DEBUG_BASE "_DYNAMIC"
-#define LM_ADDR(so) ((so) -> lm.lm_addr)
-#define LM_NEXT(so) ((so) -> lm.lm_next)
-#define LM_NAME(so) ((so) -> lm.lm_name)
+#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;
-#else /* SVR4_SHARED_LIBS */
+#else /* SVR4_SHARED_LIBS */
-#define DEBUG_BASE "_r_debug"
-#define LM_ADDR(so) ((so) -> lm.l_addr)
-#define LM_NEXT(so) ((so) -> lm.l_next)
-#define LM_NAME(so) ((so) -> lm.l_name)
+#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) \
+ (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_prev) == 0)
static struct r_debug debug_copy;
char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
-#endif /* !SVR4_SHARED_LIBS */
-
-struct so_list {
- struct so_list *next; /* next structure in linked list */
- struct link_map lm; /* copy of link map from inferior */
- struct link_map *lmaddr; /* addr in inferior lm was read from */
- CORE_ADDR lmend; /* upper addr bound of mapped object */
- char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */
- char symbols_loaded; /* flag: symbols read in yet? */
- char from_tty; /* flag: print msgs? */
- struct objfile *objfile; /* objfile for loaded lib */
- struct section_table *sections;
- struct section_table *sections_end;
- struct section_table *textsection;
- bfd *abfd;
-};
+#endif /* !SVR4_SHARED_LIBS */
+
+struct so_list
+ {
+ /* 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 */
+ struct link_map lm; /* copy of link map from inferior */
+ CORE_ADDR lmaddr; /* addr in inferior lm was read from */
+
+ /* Shared object file name, exactly as it appears in the
+ inferior's link map. This may be a relative path, or something
+ which needs to be looked up in LD_LIBRARY_PATH, etc. We use it
+ to tell which entries in the inferior's dynamic linker's link
+ map we've already loaded. */
+ char so_original_name[MAX_PATH_SIZE];
+
+ /* shared object file name, expanded to something GDB can open */
+ char so_name[MAX_PATH_SIZE];
+
+ /* The following fields of the structure are built from
+ information gathered from the shared object file itself, and
+ are initialized when we actually add it to our symbol tables. */
+
+ bfd *abfd;
+ CORE_ADDR lmend; /* upper addr bound of mapped object */
+ char symbols_loaded; /* flag: symbols read in yet? */
+ char from_tty; /* flag: print msgs? */
+ struct objfile *objfile; /* objfile for loaded lib */
+ struct section_table *sections;
+ struct section_table *sections_end;
+ struct section_table *textsection;
+ };
static struct so_list *so_list_head; /* List of known shared objects */
-static CORE_ADDR debug_base; /* Base of dynamic linker structures */
+static CORE_ADDR debug_base; /* Base of dynamic linker structures */
static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
+static int solib_cleanup_queued = 0; /* make_run_cleanup called */
+
extern int
-fdmatch PARAMS ((int, int)); /* In libiberty */
+fdmatch PARAMS ((int, int)); /* In libiberty */
/* Local function prototypes */
static void
-special_symbol_handling PARAMS ((struct so_list *));
+do_clear_solib PARAMS ((PTR));
+
+static int
+match_main PARAMS ((char *));
+
+static void
+special_symbol_handling PARAMS ((void));
static void
sharedlibrary_command PARAMS ((char *, int));
static int
enable_break PARAMS ((void));
-static int
-disable_break PARAMS ((void));
-
static void
info_sharedlibrary_command PARAMS ((char *, int));
-static int
-symbol_add_stub PARAMS ((char *));
-
-static struct so_list *
-find_solib PARAMS ((struct so_list *));
+static int symbol_add_stub PARAMS ((PTR));
-static struct link_map *
-first_link_map_member PARAMS ((void));
+static CORE_ADDR
+ first_link_map_member PARAMS ((void));
static CORE_ADDR
-locate_base PARAMS ((void));
+ locate_base PARAMS ((void));
-static void
-solib_map_sections PARAMS ((struct so_list *));
+static int solib_map_sections PARAMS ((PTR));
#ifdef SVR4_SHARED_LIBS
-static int
-look_for_base PARAMS ((int, CORE_ADDR));
-
static CORE_ADDR
-bfd_lookup_symbol PARAMS ((bfd *, char *));
+ elf_locate_base PARAMS ((void));
#else
+static struct so_list *current_sos (void);
+static void free_so (struct so_list *node);
+
+static int
+disable_break PARAMS ((void));
+
static void
-solib_add_common_symbols PARAMS ((struct rtc_symb *, struct objfile *));
+allocate_rt_common_objfile PARAMS ((void));
+
+static void
+solib_add_common_symbols (CORE_ADDR);
#endif
+void _initialize_solib PARAMS ((void));
+
+/* 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
+ LOCAL FUNCTION
- solib_map_sections -- open bfd and build sections for shared lib
+ solib_map_sections -- open bfd and build sections for shared lib
-SYNOPSIS
+ SYNOPSIS
- static void solib_map_sections (struct so_list *so)
+ static int solib_map_sections (struct so_list *so)
-DESCRIPTION
+ 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.
+ 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
+ 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?).
+ 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 void
-solib_map_sections (so)
- struct so_list *so;
+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);
+
+ 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 = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
- &scratch_pathname);
+
+ 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 (getenv ("LD_LIBRARY_PATH"), 1, filename,
- O_RDONLY, 0, &scratch_pathname);
+ scratch_chan = openp (get_in_environ
+ (inferior_environ, "LD_LIBRARY_PATH"),
+ 1, filename, O_RDONLY, 0, &scratch_pathname);
}
if (scratch_chan < 0)
{
{
close (scratch_chan);
error ("Could not open `%s' as an executable file: %s",
- scratch_pathname, bfd_errmsg (bfd_error));
+ scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
/* Leave bfd open, core_xfer_memory and "info files" need it. */
- so -> abfd = abfd;
- abfd -> cacheable = true;
+ 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_error));
+ scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
- if (build_section_table (abfd, &so -> sections, &so -> sections_end))
+ if (build_section_table (abfd, &so->sections, &so->sections_end))
{
- error ("Can't find the file sections in `%s': %s",
- bfd_get_filename (exec_bfd), bfd_errmsg (bfd_error));
+ 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++)
+ 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 += (CORE_ADDR) LM_ADDR (so);
- p -> endaddr += (CORE_ADDR) LM_ADDR (so);
- so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
- if (STREQ (p -> sec_ptr -> name, ".text"))
+ 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;
+ so->textsection = p;
}
}
/* Free the file names, close the file now. */
do_cleanups (old_chain);
-}
-/* Read all dynamically loaded common symbol definitions from the inferior
- and add them to the minimal symbol table for the shared library objfile. */
+ return (1);
+}
#ifndef SVR4_SHARED_LIBS
-/* In GDB 4.9 this routine was a real performance hog. According to
- some gprof data which mtranle@paris.IntelliCorp.COM (Minh Tran-Le)
- sent, almost all the time spend in solib_add (up to 20 minutes with
- 35 shared libraries) was spent here, with 5/6 in
- lookup_minimal_symbol and 1/6 in read_memory.
+/* 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;
+}
- To fix this, we moved the call to special_symbol_handling out of the
- loop in solib_add, so this only gets called once, rather than once
- for every shared library, and also removed the call to lookup_minimal_symbol
- in this routine. */
+/* 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, objfile)
- struct rtc_symb *rtc_symp;
- struct objfile *objfile;
+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;
- char *origname;
+
+ /* 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 (discard_minimal_symbols, 0);
+ make_cleanup_discard_minimal_symbols ();
while (rtc_symp)
{
- read_memory ((CORE_ADDR) rtc_symp,
+ read_memory (rtc_symp,
(char *) &inferior_rtc_symb,
sizeof (inferior_rtc_symb));
- read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp,
+ read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp),
(char *) &inferior_rtc_nlist,
- sizeof(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
behind the name of the symbol. */
len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx;
- origname = name = xmalloc (len);
- read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len);
-
- /* Don't enter the symbol twice if the target is re-run. */
+ name = xmalloc (len);
+ read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name),
+ name, len);
- if (name[0] == bfd_get_symbol_leading_char (objfile->obfd))
- {
- name++;
- }
+ /* Allocate the runtime common objfile if necessary. */
+ if (rt_common_objfile == NULL)
+ allocate_rt_common_objfile ();
-#if 0
- /* I think this is unnecessary, GDB can probably deal with
- duplicate minimal symbols, more or less. And the duplication
- which used to happen because this was called for each shared
- library is gone now that we are just called once. */
- /* FIXME: Do we really want to exclude symbols which happen
- to match symbols for other locations in the inferior's
- address space, even when they are in different linkage units? */
- if (lookup_minimal_symbol (name, (struct objfile *) NULL) == NULL)
-#endif
- {
- name = obsavestring (name, strlen (name),
- &objfile -> symbol_obstack);
- prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
- mst_bss, objfile);
- }
- free (origname);
+ prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
+ mst_bss, rt_common_objfile);
+ free (name);
}
- rtc_symp = inferior_rtc_symb.rtc_next;
+ rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next);
}
/* Install any minimal symbols that have been collected as the current
- minimal symbols for this objfile. */
+ minimal symbols for the runtime common objfile. */
- install_minimal_symbols (objfile);
+ install_minimal_symbols (rt_common_objfile);
}
-#endif /* SVR4_SHARED_LIBS */
+#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
+ LOCAL FUNCTION
-SYNOPSIS
+ bfd_lookup_symbol -- lookup the value for a specific symbol
- CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
+ SYNOPSIS
-DESCRIPTION
+ CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
- 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.
+ DESCRIPTION
- Note that 0 is specifically allowed as an error return (no
- such symbol).
+ 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.
- FIXME: See if there is a less "expensive" way of doing this.
- Also see if there is already another bfd or gdb function
- that specifically does this, and if so, use it.
-*/
+ Note that 0 is specifically allowed as an error return (no
+ such symbol).
+ */
static CORE_ADDR
bfd_lookup_symbol (abfd, symname)
unsigned int i;
struct cleanup *back_to;
CORE_ADDR symaddr = 0;
-
- storage_needed = get_symtab_upper_bound (abfd);
+
+ 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);
-
+ 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))
+ if (STREQ (sym->name, symname))
{
/* Bfd symbols are section relative. */
- symaddr = sym -> value + sym -> section -> vma;
+ symaddr = sym->value + sym->section->vma;
break;
}
}
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).
+ */
-LOCAL FUNCTION
+static char *debug_base_symbols[] =
+{
+ "r_debug", /* Solaris 2.3 */
+ "_r_debug", /* Solaris 2.1, 2.2 */
+ NULL
+};
- look_for_base -- examine file for each mapped address segment
+static int
+look_for_base PARAMS ((int, CORE_ADDR));
+
+/*
-SYNOPSYS
+ LOCAL FUNCTION
- static int look_for_base (int fd, CORE_ADDR baseaddr)
+ look_for_base -- examine file for each mapped address segment
-DESCRIPTION
+ SYNOPSYS
- 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.
+ static int look_for_base (int fd, CORE_ADDR baseaddr)
- Our job is to find the symbol DEBUG_BASE in the file that this
- fd is open on, if it exists, and if so, initialize the dynamic
- linker structure base address debug_base.
+ DESCRIPTION
- 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.
+ 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
CORE_ADDR baseaddr;
{
bfd *interp_bfd;
- CORE_ADDR address;
+ 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) || fdmatch (fileno ((GDB_FILE *)(exec_bfd -> iostream)), fd))
+ if (fd == -1
+ || (exec_bfd != NULL
+ && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd)))
{
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
+ /* 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. */
- if ((address = bfd_lookup_symbol (interp_bfd, DEBUG_BASE)) == 0)
+ 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);
}
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;
+ int arch_size;
+
+ /* 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. */
+
+ arch_size = bfd_elf_get_arch_size (exec_bfd);
+ if (arch_size == -1) /* failure */
+ return 0;
+
+ if (arch_size == 32)
+ { /* 32-bit elf */
+ 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 /* 64-bit elf */
+ {
+ 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;
+ }
+ }
+ }
-/*
+ /* DT_DEBUG entry not found. */
+ return 0;
+}
+
+#endif /* SVR4_SHARED_LIBS */
-LOCAL FUNCTION
+/*
- locate_base -- locate the base address of dynamic linker structs
+ LOCAL FUNCTION
-SYNOPSIS
+ locate_base -- locate the base address of dynamic linker structs
- CORE_ADDR locate_base (void)
+ SYNOPSIS
-DESCRIPTION
+ CORE_ADDR locate_base (void)
- 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 symbol defined by the macro DEBUG_BASE.
- 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).
+ DESCRIPTION
- 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.
+ 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).
- The SVR4 version is much more complicated because 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. We have to go
- to a lot more work to discover the address of DEBUG_BASE. 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.
+ 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.
- Note that we can assume nothing about the process state at the time
- we need to find this address. We may be stopped on the first instruc-
- tion 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).
+ 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.
*/
struct minimal_symbol *msymbol;
CORE_ADDR address = 0;
+ char **symbolp;
- /* For SunOS, we want to limit the search for DEBUG_BASE 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 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. */
- msymbol = lookup_minimal_symbol (DEBUG_BASE, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
+ for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
{
- address = SYMBOL_VALUE_ADDRESS (msymbol);
+ msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile);
+ if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
+ {
+ address = SYMBOL_VALUE_ADDRESS (msymbol);
+ return (address);
+ }
}
- return (address);
+ return (0);
-#else /* SVR4_SHARED_LIBS */
+#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, ask the /proc support interface to iterate
- over the list of mapped address segments, calling look_for_base() for
- each segment. When we are done, we will have either found the base
- address or not. */
+ we have no cached address, try to locate it in the dynamic info
+ section for ELF executables. */
if (debug_base == 0)
{
- proc_iterate_over_mappings (look_for_base);
+ 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 */
+#endif /* !SVR4_SHARED_LIBS */
}
/*
-LOCAL FUNCTION
+ LOCAL FUNCTION
- first_link_map_member -- locate first member in dynamic linker's map
+ first_link_map_member -- locate first member in dynamic linker's map
-SYNOPSIS
+ SYNOPSIS
- static struct link_map *first_link_map_member (void)
+ static CORE_ADDR first_link_map_member (void)
-DESCRIPTION
+ DESCRIPTION
- Read in a copy of the first member in the inferior's dynamic
- link map from the inferior's dynamic linker structures, and return
- a pointer to the copy in our address space.
-*/
+ 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 struct link_map *
+static CORE_ADDR
first_link_map_member ()
{
- struct link_map *lm = NULL;
+ CORE_ADDR lm = 0;
#ifndef SVR4_SHARED_LIBS
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 ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy,
- sizeof (struct link_dynamic_2));
- lm = ld_2_copy.ld_loaded;
+ 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 */
+#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 = debug_copy.r_map;
+ lm = SOLIB_EXTRACT_ADDRESS (debug_copy.r_map);
-#endif /* !SVR4_SHARED_LIBS */
+#endif /* !SVR4_SHARED_LIBS */
return (lm);
}
+#ifdef SVR4_SHARED_LIBS
/*
-LOCAL FUNCTION
+ LOCAL FUNCTION
- find_solib -- step through list of shared objects
+ open_symbol_file_object
-SYNOPSIS
+ SYNOPSIS
- struct so_list *find_solib (struct so_list *so_list_ptr)
+ void open_symbol_file_object (int from_tty)
-DESCRIPTION
+ DESCRIPTION
- This module contains the routine which finds the names of any
- loaded "images" in the current process. The argument in must be
- NULL on the first call, and then the returned value must be passed
- in on subsequent calls. This provides the capability to "step" down
- the list of loaded objects. On the last object, a NULL value is
- returned.
+ 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.
- The arg and return value are "struct link_map" pointers, as defined
- in <link.h>.
*/
+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 *
-find_solib (so_list_ptr)
- struct so_list *so_list_ptr; /* Last lm or NULL for first one */
+current_sos ()
{
- struct so_list *so_list_next = NULL;
- struct link_map *lm = NULL;
- struct so_list *new;
-
- if (so_list_ptr == NULL)
+ 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)
{
- /* We are setting up for a new scan through the loaded images. */
- if ((so_list_next = so_list_head) == NULL)
- {
- /* We have not already read in the dynamic linking structures
- from the inferior, lookup the address of the base structure. */
- debug_base = locate_base ();
- if (debug_base != 0)
- {
- /* Read the base structure in and find the address of the first
- link map list member. */
- lm = first_link_map_member ();
- }
- }
+ 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;
}
- else
+
+ /* Walk the inferior's link map list, and build our list of
+ `struct so_list' nodes. */
+ lm = first_link_map_member ();
+ while (lm)
{
- /* We have been called before, and are in the process of walking
- the shared library list. Advance to the next shared object. */
- if ((lm = LM_NEXT (so_list_ptr)) == NULL)
+ 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
{
- /* We have hit the end of the list, so check to see if any were
- added, but be quiet if we can't read from the target any more. */
- int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr,
- (char *) &(so_list_ptr -> lm),
- sizeof (struct link_map));
- if (status == 0)
+ 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)
{
- lm = LM_NEXT (so_list_ptr);
+ warning ("current_sos: Can't read pathname for load map: %s\n",
+ safe_strerror (errcode));
}
else
{
- lm = NULL;
+ 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;
}
}
- so_list_next = so_list_ptr -> next;
- }
- if ((so_list_next == NULL) && (lm != NULL))
- {
- /* Get next link map structure from inferior image and build a local
- abbreviated load_map structure */
- new = (struct so_list *) xmalloc (sizeof (struct so_list));
- memset ((char *) new, 0, sizeof (struct so_list));
- new -> lmaddr = lm;
- /* Add the new node as the next node in the list, or as the root
- node if this is the first one. */
- if (so_list_ptr != NULL)
- {
- so_list_ptr -> next = new;
- }
- else
- {
- so_list_head = new;
- }
- so_list_next = new;
- read_memory ((CORE_ADDR) lm, (char *) &(new -> lm),
- sizeof (struct link_map));
- /* For the SVR4 version, there is one entry that has no name
- (for the inferior executable) since it is not a shared object. */
- if (LM_NAME (new) != 0)
- {
- if (!target_read_string((CORE_ADDR) LM_NAME (new), new -> so_name,
- MAX_PATH_SIZE - 1))
- error ("find_solib: Can't read pathname for load map\n");
- new -> so_name[MAX_PATH_SIZE - 1] = 0;
- solib_map_sections (new);
- }
+
+ discard_cleanups (old_chain);
}
- return (so_list_next);
+
+ return head;
}
+
/* A small stub to get us past the arg-passing pinhole of catch_errors. */
static int
symbol_add_stub (arg)
- char *arg;
+ PTR arg;
{
- register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
-
- so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
- (unsigned int) so -> textsection -> addr,
- 0, 0, 0);
+ register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
+ struct section_addr_info *sap;
+ CORE_ADDR lowest_addr = 0;
+ int lowest_index;
+ asection *lowest_sect = NULL;
+
+ /* 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)
+ {
+ lowest_addr = so->textsection->addr;
+ lowest_sect = bfd_get_section_by_name (so->abfd, ".text");
+ lowest_index = lowest_sect->index;
+ }
+ else if (so->abfd != NULL)
+ {
+ /* If we didn't find a mapped non zero sized .text section, set
+ up lowest_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)
+ {
+ lowest_addr = bfd_section_vma (so->abfd, lowest_sect)
+ + LM_ADDR (so);
+ lowest_index = lowest_sect->index;
+ }
+ }
+
+ sap = build_section_addr_info_from_section_table (so->sections,
+ so->sections_end);
+
+ sap->other[lowest_index].addr = lowest_addr;
+
+ so->objfile = symbol_file_add (so->so_name, so->from_tty,
+ sap, 0, OBJF_SHARED);
+ free_section_addr_info (sap);
+
return (1);
}
-/*
-GLOBAL FUNCTION
+/* LOCAL FUNCTION
+
+ update_solib_list --- synchronize GDB's shared object list with inferior's
- solib_add -- add a shared library file to the symtab and section list
+ SYNOPSIS
-SYNOPSIS
+ void update_solib_list (int from_tty, struct target_ops *TARGET)
- void solib_add (char *arg_string, 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.
-DESCRIPTION
+ 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
-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)
+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)
{
- error ("Invalid regexp: %s", re_err);
+ make_run_cleanup (do_clear_solib, NULL);
+ solib_cleanup_queued = 1;
}
-
- /* Getting new symbols may change our opinion about what is
- frameless. */
- reinit_frame_cache ();
-
- while ((so = find_solib (so)) != NULL)
+
+ /* 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)
{
- if (so -> so_name[0] && re_exec (so -> so_name))
+ 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)
{
- 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;
- }
+ 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 add the shared library sections to the section table of the
- specified target, if any. */
- if (target)
+
+ /* 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)
{
- /* Count how many new section_table entries there are. */
- so = NULL;
- count = 0;
- while ((so = find_solib (so)) != NULL)
+ 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)
{
- if (so -> so_name[0])
+ 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)
{
- count += so -> sections_end - so -> sections;
+ 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;
+ }
}
}
-
- if (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))
{
- /* Reallocate the target's section table including the new size. */
- if (target -> to_sections)
+ any_matches = 1;
+
+ if (gdb->symbols_loaded)
{
- 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));
+ if (from_tty)
+ printf_unfiltered ("Symbols already loaded for %s\n",
+ gdb->so_name);
}
else
{
- old = 0;
- target -> to_sections = (struct section_table *)
- xmalloc ((sizeof (struct section_table)) * count);
- }
- target -> to_sections_end = target -> to_sections + (count + old);
-
- /* Add these section table entries to the target's table. */
- while ((so = find_solib (so)) != NULL)
- {
- if (so -> so_name[0])
+ if (catch_errors
+ (symbol_add_stub, gdb,
+ "Error while reading shared library symbols:\n",
+ RETURN_MASK_ALL))
{
- count = so -> sections_end - so -> sections;
- memcpy ((char *) (target -> to_sections + old),
- so -> sections,
- (sizeof (struct section_table)) * count);
- old += count;
+ if (from_tty)
+ printf_unfiltered ("Loaded symbols for %s\n",
+ gdb->so_name);
+ gdb->symbols_loaded = 1;
+ loaded_any_symbols = 1;
}
}
}
- }
- /* Calling this once at the end means that we put all the minimal
- symbols for commons into the objfile for the last shared library.
- Since they are in common, this should not be a problem. If we
- delete the objfile with the minimal symbols, we can put all the
- symbols into a new objfile (and will on the next call to solib_add).
+ if (from_tty && pattern && ! any_matches)
+ printf_unfiltered
+ ("No loaded shared libraries match the pattern `%s'.\n", pattern);
- An alternate approach would be to create an objfile just for
- common minsyms, thus not needing any objfile argument to
- solib_add_common_symbols. */
+ if (loaded_any_symbols)
+ {
+ /* Getting new symbols may change our opinion about what is
+ frameless. */
+ reinit_frame_cache ();
- if (so_last)
- special_symbol_handling (so_last);
+ special_symbol_handling ();
+ }
+ }
}
+
/*
-LOCAL FUNCTION
+ LOCAL FUNCTION
- info_sharedlibrary_command -- code for "info sharedlibrary"
+ info_sharedlibrary_command -- code for "info sharedlibrary"
-SYNOPSIS
+ SYNOPSIS
- static void info_sharedlibrary_command ()
+ static void info_sharedlibrary_command ()
-DESCRIPTION
+ DESCRIPTION
- Walk through the shared library list and print information
- about each attached library.
-*/
+ 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 */
+ register struct so_list *so = NULL; /* link map state variable */
int header_done = 0;
-
+ int addr_width;
+ char *addr_fmt;
+ int arch_size;
+
if (exec_bfd == NULL)
{
- printf_unfiltered ("No exec file.\n");
+ printf_unfiltered ("No executable file.\n");
return;
}
- while ((so = find_solib (so)) != NULL)
+
+ arch_size = bfd_elf_get_arch_size (exec_bfd);
+ /* Default to 32-bit in case of failure (non-elf). */
+ if (arch_size == 32 || arch_size == -1)
+ {
+ addr_width = 8 + 4;
+ addr_fmt = "08l";
+ }
+ else if (arch_size == 64)
{
- if (so -> so_name[0])
+ addr_width = 16 + 4;
+ addr_fmt = "016l";
+ }
+
+ 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("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
- "Shared Object Library");
+ printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From",
+ addr_width, "To", "Syms Read",
+ "Shared Object Library");
header_done++;
}
- printf_unfiltered ("%-12s",
- local_hex_string_custom ((unsigned long) LM_ADDR (so),
- "08l"));
- printf_unfiltered ("%-12s",
- local_hex_string_custom ((unsigned long) so -> lmend,
- "08l"));
- printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No");
- printf_unfiltered ("%s\n", so -> so_name);
+
+ 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");
+ printf_unfiltered ("No shared libraries loaded at this time.\n");
}
}
/*
-GLOBAL FUNCTION
+ GLOBAL FUNCTION
- solib_address -- check to see if an address is in a shared lib
+ solib_address -- check to see if an address is in a shared lib
-SYNOPSIS
+ SYNOPSIS
- int solib_address (CORE_ADDR address)
+ char * solib_address (CORE_ADDR address)
-DESCRIPTION
+ 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.
+ 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.
+ For example, this routine is called at one point to disable
+ breakpoints which are in shared libraries that are not currently
+ mapped in.
*/
-int
+char *
solib_address (address)
CORE_ADDR address;
{
- register struct so_list *so = 0; /* link map state variable */
-
- while ((so = find_solib (so)) != NULL)
+ register struct so_list *so = 0; /* link map state variable */
+
+ for (so = so_list_head; so; so = so->next)
{
- if (so -> so_name[0])
- {
- if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
- (address < (CORE_ADDR) so -> lmend))
- {
- return (1);
- }
- }
+ if (LM_ADDR (so) <= address && address < so->lmend)
+ return (so->so_name);
}
+
return (0);
}
/* Called by free_all_symtabs */
-void
-clear_solib()
+void
+clear_solib ()
{
- struct so_list *next;
- char *bfd_filename;
-
+ /* 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)
{
- 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;
+ 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
+ LOCAL FUNCTION
- disable_break -- remove the "mapping changed" breakpoint
+ disable_break -- remove the "mapping changed" breakpoint
-SYNOPSIS
+ SYNOPSIS
- static int disable_break ()
+ static int disable_break ()
-DESCRIPTION
+ DESCRIPTION
- Removes the breakpoint that gets hit when the dynamic linker
- completes a mapping change.
+ Removes the breakpoint that gets hit when the dynamic linker
+ completes a mapping change.
-*/
+ */
+
+#ifndef SVR4_SHARED_LIBS
static int
disable_break ()
#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
write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
- breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr;
+ 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 */
+#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. */
status = 0;
}
-#endif /* !SVR4_SHARED_LIBS */
+#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.
return (status);
}
-/*
-
-LOCAL FUNCTION
-
- enable_break -- arrange for dynamic linker to hit breakpoint
-
-SYNOPSIS
-
- int enable_break (void)
-
-DESCRIPTION
+#endif /* #ifdef SVR4_SHARED_LIBS */
- 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.
-*/
+ 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 ()
/* Calc address of debugger interface structure */
- debug_addr = (CORE_ADDR) dynamic_copy.ldd;
+ debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd);
/* Calc address of `in_debugger' member of debugger interface structure */
write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
success = 1;
-#else /* SVR4_SHARED_LIBS */
+#else /* SVR4_SHARED_LIBS */
#ifdef BKPT_AT_SYMBOL
struct minimal_symbol *msymbol;
char **bkpt_namep;
- CORE_ADDR bkpt_addr;
+ 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, symfile_objfile);
+ msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile);
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
{
- bkpt_addr = SYMBOL_VALUE_ADDRESS (msymbol);
- if (target_insert_breakpoint (bkpt_addr, shadow_contents) == 0)
- {
- breakpoint_addr = bkpt_addr;
- success = 1;
- break;
- }
+ create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol));
+ return 1;
}
}
-#else /* !BKPT_AT_SYMBOL */
+ /* Nothing good happened. */
+ success = 0;
+
+#endif /* BKPT_AT_SYMBOL */
+
+#endif /* !SVR4_SHARED_LIBS */
- struct symtab_and_line sal;
+ return (success);
+}
- /* Read the debugger interface structure directly. */
+/*
- read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy));
+ GLOBAL FUNCTION
- /* Set breakpoint at the debugger interface stub routine that will
- be called just prior to each mapping change and again after the
- mapping change is complete. Set up the (nonexistent) handler to
- deal with hitting these breakpoints. (FIXME). */
+ solib_create_inferior_hook -- shared library startup support
- warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__);
- success = 1;
+ SYNOPSIS
-#endif /* BKPT_AT_SYMBOL */
+ void solib_create_inferior_hook()
-#endif /* !SVR4_SHARED_LIBS */
+ DESCRIPTION
- 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()
+ 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. find_solib will get it when it needs
+ 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)
return;
}
- /* Now run the target. It will eventually hit the breakpoint, at
+#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 = 0;
+ stop_signal = TARGET_SIGNAL_0;
do
{
target_resume (-1, 0, stop_signal);
wait_for_inferior ();
}
- while (stop_signal != SIGTRAP);
+ 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
warning ("shared library handler failed to disable breakpoint");
}
- solib_add ((char *) 0, 0, (struct target_ops *) 0);
+ if (auto_solib_add)
+ solib_add ((char *) 0, 0, (struct target_ops *) 0);
+#endif /* ! _SCO_DS */
+#endif
}
/*
-LOCAL FUNCTION
+ LOCAL FUNCTION
- special_symbol_handling -- additional shared library symbol handling
+ special_symbol_handling -- additional shared library symbol handling
-SYNOPSIS
+ SYNOPSIS
- void special_symbol_handling (struct so_list *so)
+ void special_symbol_handling ()
-DESCRIPTION
+ 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.
+ 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 Suns, 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 corresponding
- objfile.
+ 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 (so)
-struct so_list *so;
+special_symbol_handling ()
{
#ifndef SVR4_SHARED_LIBS
int j;
/* Calc address of debugger interface structure */
/* FIXME, this needs work for cross-debugging of core files
- (byteorder, size, alignment, etc). */
+ (byteorder, size, alignment, etc). */
- debug_addr = (CORE_ADDR) dynamic_copy.ldd;
+ debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd);
}
/* Read the debugger structure from the inferior, just to make sure
j = target_read_memory (debug_addr, (char *) &debug_copy,
sizeof (debug_copy));
if (j)
- return; /* unreadable */
+ return; /* unreadable */
/* Get common symbol definitions for the loaded object. */
if (debug_copy.ldd_cp)
{
- solib_add_common_symbols (debug_copy.ldd_cp, so -> objfile);
+ solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp));
}
-#endif /* !SVR4_SHARED_LIBS */
+#endif /* !SVR4_SHARED_LIBS */
}
/*
-LOCAL FUNCTION
+ LOCAL FUNCTION
- sharedlibrary_command -- handle command to explicitly add library
+ sharedlibrary_command -- handle command to explicitly add library
-SYNOPSIS
+ SYNOPSIS
- static void sharedlibrary_command (char *args, int from_tty)
+ static void sharedlibrary_command (char *args, int from_tty)
-DESCRIPTION
+ DESCRIPTION
-*/
+ */
static void
sharedlibrary_command (args, from_tty)
-char *args;
-int 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()
+_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,
+ 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 */
}
projects / deliverable / binutils-gdb.git / blobdiff