/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger.
- Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998
+ Free Software Foundation, Inc.
This file is part of GDB.
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. */
+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>
+#include <unistd.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 "command.h"
#include "target.h"
#include "frame.h"
-#include "regex.h"
+#include "gnu-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 MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */
+#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
-/* On SVR4 systems, for the initial implementation, use main() 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) */
+/* Symbols which are used to locate the base of the link map structures. */
-#define BKPT_AT_MAIN 1
+#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 */
#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)
+/* Test for first link map entry; first entry is a shared library. */
+#define IGNORE_FIRST_LINK_MAP_ENTRY(x) (0)
static struct link_dynamic dynamic_copy;
static struct link_dynamic_2 ld_2_copy;
static struct ld_debug debug_copy;
#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)
+/* Test for first link map entry; first entry is the exec-file. */
+#define IGNORE_FIRST_LINK_MAP_ENTRY(x) ((x).l_prev == NULL)
static struct r_debug debug_copy;
char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
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? */
- bfd *so_bfd; /* bfd for so_name */
struct objfile *objfile; /* objfile for loaded lib */
struct section_table *sections;
struct section_table *sections_end;
+ struct section_table *textsection;
+ bfd *abfd;
};
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 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 */
+
/* Local function prototypes */
+static void
+do_clear_solib PARAMS ((PTR));
+
+static int
+match_main PARAMS ((char *));
+
static void
special_symbol_handling PARAMS ((struct so_list *));
static int
enable_break PARAMS ((void));
-static int
-disable_break PARAMS ((void));
-
static void
-info_sharedlibrary_command PARAMS ((void));
+info_sharedlibrary_command PARAMS ((char *, int));
static int
symbol_add_stub PARAMS ((char *));
#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 int
+disable_break PARAMS ((void));
+
+static void
+allocate_rt_common_objfile PARAMS ((void));
+
static void
-solib_add_common_symbols PARAMS ((struct rtc_symb *, struct objfile *));
+solib_add_common_symbols PARAMS ((struct rtc_symb *));
#endif
+/* 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
char *scratch_pathname;
int scratch_chan;
struct section_table *p;
+ struct cleanup *old_chain;
+ bfd *abfd;
filename = tilde_expand (so -> so_name);
- make_cleanup (free, filename);
- scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
- &scratch_pathname);
+ 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 (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)
{
perror_with_name (filename);
- }
+ }
+ /* Leave scratch_pathname allocated. abfd->name will point to it. */
- so -> so_bfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan);
- if (!so -> so_bfd)
+ 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_error));
+ scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
- if (!bfd_check_format (so -> so_bfd, bfd_object))
+ /* 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_error));
+ scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
- if (build_section_table (so -> so_bfd, &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",
- exec_bfd -> filename, bfd_errmsg (bfd_error));
+ bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
}
for (p = so -> sections; p < so -> sections_end; p++)
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 -> the_bfd_section -> name, ".text"))
+ {
+ so -> textsection = p;
+ }
}
-}
-/* Read all dynamically loaded common symbol definitions from the inferior
- and add them to the minimal symbol table for the shared library objfile. */
+ /* Free the file names, close the file now. */
+ do_cleanups (old_chain);
+}
#ifndef SVR4_SHARED_LIBS
+/* Allocate the runtime common object file. */
+
static void
-solib_add_common_symbols (rtc_symp, objfile)
+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)
struct rtc_symb *rtc_symp;
- struct objfile *objfile;
{
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);
behind the name of the symbol. */
len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx;
- origname = name = xmalloc (len);
+ 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. */
+ /* Allocate the runtime common objfile if necessary. */
+ if (rt_common_objfile == NULL)
+ allocate_rt_common_objfile ();
-#ifdef NAMES_HAVE_UNDERSCORE
- if (*name == '_')
- {
- name++;
- }
-#endif
- /* 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)
- {
- name = obsavestring (name, strlen (name),
- &objfile -> symbol_obstack);
- prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
- mst_bss);
- }
- 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;
}
/* 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 */
+
#ifdef SVR4_SHARED_LIBS
+static CORE_ADDR
+bfd_lookup_symbol PARAMS ((bfd *, char *));
+
/*
LOCAL FUNCTION
Note that 0 is specifically allowed as an error return (no
such symbol).
-
- 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.
*/
static CORE_ADDR
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)
{
for (i = 0; i < number_of_symbols; i++)
{
sym = *symbol_table++;
- if (strcmp (sym -> name, symname) == 0)
+ if (STREQ (sym -> name, symname))
{
- symaddr = sym -> value;
+ /* Bfd symbols are section relative. */
+ 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).
+*/
+
+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
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 symbol DEBUG_BASE in the file that this
+ 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.
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 ((FILE *)(exec_bfd -> iostream)), fd))
+ if (fd == -1
+ || (exec_bfd != NULL
+ && fdmatch (fileno ((GDB_FILE *)(exec_bfd -> iostream)), fd)))
{
return (0);
}
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", NULL, fd)) == NULL)
+ 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
+ /* 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;
+
+ /* 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
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).
+ 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
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 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.
-
- 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) && (msymbol -> address != 0))
+ for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
{
- address = msymbol -> address;
+ 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 */
/* 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);
}
+/*
+
+LOCAL FUNCTION
+
+ first_link_map_member -- locate first member in dynamic linker's map
+
+SYNOPSIS
+
+ static struct link_map *first_link_map_member (void)
+
+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.
+*/
+
static struct link_map *
first_link_map_member ()
{
#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;
#endif /* !SVR4_SHARED_LIBS */
/* 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)
+ if (debug_base != 0)
{
/* Read the base structure in and find the address of the first
link map list member. */
/* 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));
- (void) memset ((char *) new, 0, 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. */
else
{
so_list_head = new;
+
+ if (! solib_cleanup_queued)
+ {
+ make_run_cleanup (do_clear_solib);
+ solib_cleanup_queued = 1;
+ }
+
}
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)
+ /* 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 -> lm))
{
- 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;
+ int errcode;
+ char *buffer;
+ target_read_string ((CORE_ADDR) LM_NAME (new), &buffer,
+ MAX_PATH_SIZE - 1, &errcode);
+ if (errcode != 0)
+ error ("find_solib: Can't read pathname for load map: %s\n",
+ safe_strerror (errcode));
+ strncpy (new -> so_name, buffer, MAX_PATH_SIZE - 1);
+ new -> so_name[MAX_PATH_SIZE - 1] = '\0';
+ free (buffer);
solib_map_sections (new);
}
}
char *arg;
{
register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
+ CORE_ADDR text_addr = 0;
+
+ if (so -> textsection)
+ text_addr = so -> textsection -> addr;
+ else
+ {
+ 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)
+ + (CORE_ADDR) LM_ADDR (so);
+ }
- so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
- (unsigned int) LM_ADDR (so), 0, 0, 0);
+ ALL_OBJFILES (so -> objfile)
+ {
+ if (strcmp (so -> objfile -> name, so -> so_name) == 0)
+ return 1;
+ }
+ so -> objfile =
+ symbol_file_add (so -> so_name, so -> from_tty,
+ text_addr,
+ 0, 0, 0);
return (1);
}
+/* This function will check the so name to see if matches the main list.
+ In some system the main object is in the list, which we want to exclude */
+
+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);
+}
+
/*
GLOBAL FUNCTION
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;
error ("Invalid regexp: %s", re_err);
}
- /* Getting new symbols may change our opinion about what is
- frameless. */
- reinit_frame_cache ();
-
- while ((so = find_solib (so)) != NULL)
- {
- if (so -> so_name[0] && re_exec (so -> so_name))
- {
- if (so -> symbols_loaded)
- {
- if (from_tty)
- {
- printf ("Symbols already loaded for %s\n", so -> so_name);
- }
- }
- else
- {
- catch_errors (symbol_add_stub, (char *) so,
- "Error while reading shared library symbols:\n");
-
- special_symbol_handling (so);
- so -> symbols_loaded = 1;
- so -> from_tty = from_tty;
- }
- }
- }
-
- /* Now add the shared library sections to the section table of the
+ /* Add the shared library sections to the section table of the
specified target, if any. */
if (target)
{
count = 0;
while ((so = find_solib (so)) != NULL)
{
- if (so -> so_name[0])
+ if (so -> so_name[0] && !match_main (so -> so_name))
{
count += so -> sections_end - so -> sections;
}
if (count)
{
+ int update_coreops;
+
+ /* We must update the to_sections field in the core_ops structure
+ here, otherwise we dereference a potential dangling pointer
+ for each call to target_read/write_memory within this routine. */
+ update_coreops = core_ops.to_sections == target->to_sections;
+
/* Reallocate the target's section table including the new size. */
if (target -> to_sections)
{
old = target -> to_sections_end - target -> to_sections;
target -> to_sections = (struct section_table *)
- realloc ((char *)target -> to_sections,
+ xrealloc ((char *)target -> to_sections,
(sizeof (struct section_table)) * (count + old));
}
else
{
old = 0;
target -> to_sections = (struct section_table *)
- malloc ((sizeof (struct section_table)) * count);
+ xmalloc ((sizeof (struct section_table)) * count);
}
target -> to_sections_end = target -> to_sections + (count + old);
+ /* Update the to_sections field in the core_ops structure
+ if needed. */
+ if (update_coreops)
+ {
+ core_ops.to_sections = target->to_sections;
+ core_ops.to_sections_end = target->to_sections_end;
+ }
+
/* Add these section table entries to the target's table. */
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
count = so -> sections_end - so -> sections;
- bcopy (so -> sections, (char *)(target -> to_sections + old),
- (sizeof (struct section_table)) * count);
+ memcpy ((char *) (target -> to_sections + old),
+ so -> sections,
+ (sizeof (struct section_table)) * count);
old += count;
}
}
}
}
+
+ /* Now add the symbol files. */
+ while ((so = find_solib (so)) != NULL)
+ {
+ if (so -> so_name[0] && re_exec (so -> so_name) &&
+ !match_main (so -> so_name))
+ {
+ so -> from_tty = from_tty;
+ if (so -> symbols_loaded)
+ {
+ if (from_tty)
+ {
+ printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name);
+ }
+ }
+ else if (catch_errors
+ (symbol_add_stub, (char *) so,
+ "Error while reading shared library symbols:\n",
+ RETURN_MASK_ALL))
+ {
+ so_last = so;
+ so -> symbols_loaded = 1;
+ }
+ }
+ }
+
+ /* Getting new symbols may change our opinion about what is
+ frameless. */
+ if (so_last)
+ reinit_frame_cache ();
+
+ if (so_last)
+ special_symbol_handling (so_last);
}
/*
*/
static void
-info_sharedlibrary_command ()
+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 ("No exec file.\n");
+ printf_unfiltered ("No exec file.\n");
return;
}
+
+#ifndef TARGET_ELF64
+ addr_width = 8+4;
+ addr_fmt = "08l";
+#else
+ addr_width = 16+4;
+ addr_fmt = "016l";
+#endif
+
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
if (!header_done)
{
- printf("%-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 ("%-12s", local_hex_string_custom ((int) LM_ADDR (so), "08"));
- printf ("%-12s", local_hex_string_custom (so -> lmend, "08"));
- printf ("%-12s", so -> symbols_loaded ? "Yes" : "No");
- printf ("%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 ("No shared libraries loaded at this time.\n");
+ printf_unfiltered ("No shared libraries loaded at this time.\n");
}
}
SYNOPSIS
- int solib_address (CORE_ADDR address)
+ char * solib_address (CORE_ADDR address)
DESCRIPTION
mapped in.
*/
-int
+char *
solib_address (address)
CORE_ADDR address;
{
{
if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
(address < (CORE_ADDR) so -> lmend))
- {
- return (1);
- }
+ return (so->so_name);
}
}
return (0);
clear_solib()
{
struct so_list *next;
+ char *bfd_filename;
while (so_list_head)
{
{
free ((PTR)so_list_head -> sections);
}
- if (so_list_head -> so_bfd)
+ if (so_list_head -> abfd)
{
- bfd_close (so_list_head -> so_bfd);
+ bfd_filename = bfd_get_filename (so_list_head -> abfd);
+ if (!bfd_close (so_list_head -> abfd))
+ warning ("cannot close \"%s\": %s",
+ bfd_filename, bfd_errmsg (bfd_get_error ()));
}
+ else
+ /* This happens for the executable on SVR4. */
+ bfd_filename = NULL;
+
next = so_list_head -> next;
- free((PTR)so_list_head);
+ if (bfd_filename)
+ free ((PTR)bfd_filename);
+ free ((PTR)so_list_head);
so_list_head = next;
}
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
*/
+#ifndef SVR4_SHARED_LIBS
+
static int
disable_break ()
{
return (status);
}
+#endif /* #ifdef SVR4_SHARED_LIBS */
+
/*
LOCAL FUNCTION
static int
enable_break ()
{
-
- int j;
+ 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,
/* 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_MAIN
+#ifdef BKPT_AT_SYMBOL
struct minimal_symbol *msymbol;
+ char **bkpt_namep;
+ asection *interp_sect;
- msymbol = lookup_minimal_symbol ("main", symfile_objfile);
- if ((msymbol != NULL) && (msymbol -> address != 0))
- {
- breakpoint_addr = msymbol -> address;
- }
- else
- {
- return (0);
- }
+ /* 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;
- if (target_insert_breakpoint (breakpoint_addr, shadow_contents) != 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)
{
- return (0);
- }
+ 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 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;
+ }
-#else /* !BKPT_AT_MAIN */
+ /* 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;
- struct symtab_and_line sal;
+ /* 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);
+ }
- /* Read the debugger interface structure directly. */
+ /* 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;
+ }
- read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy));
+ /* We're done with the temporary bfd. */
+ bfd_close (tmp_bfd);
- /* 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). */
+ if (sym_addr != 0)
+ {
+ create_solib_event_breakpoint (load_addr + sym_addr);
+ return 1;
+ }
- warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__);
+ /* 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.");
+ warning ("GDB will be unable to debug shared library initializers");
+ warning ("and track explicitly loaded dynamic code.");
+ }
+#endif
-#endif /* BKPT_AT_MAIN */
+ /* 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 (1);
+ return (success);
}
/*
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
Also, what if child has exit()ed? Must exit loop somehow.
*/
-void
+void
solib_create_inferior_hook()
{
-
+ static int dyn_relocated;
+
+ /* 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
+ 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 ())
{
return;
}
- /* Now run the target. It will eventually hit the breakpoint, at
+ if (!dyn_relocated && exec_bfd->start_address != stop_pc)
+ {
+ /* We have to relocate the debug information. */
+ CORE_ADDR displacement = stop_pc - exec_bfd->start_address;
+ struct section_offsets *new_offsets;
+ int i;
+
+ new_offsets = alloca (symfile_objfile->num_sections
+ * sizeof (*new_offsets));
+
+ for (i = 0; i < symfile_objfile->num_sections; ++i)
+ ANOFFSET (new_offsets, i) =
+ ANOFFSET (symfile_objfile->section_offsets, i);
+
+ ANOFFSET (new_offsets, SECT_OFF_TEXT) += displacement;
+ ANOFFSET (new_offsets, SECT_OFF_DATA) += displacement;
+ ANOFFSET (new_offsets, SECT_OFF_BSS) += displacement;
+ ANOFFSET (new_offsets, SECT_OFF_RODATA) += displacement;
+
+ objfile_relocate (symfile_objfile, new_offsets);
+ breakpoint_re_set ();
+
+ /* Make sure this relocation is done only once. */
+ dyn_relocated = 1;
+ }
+
+#ifndef SVR4_SHARED_LIBS
+ /* Only SunOS needs 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 (0, stop_signal);
+ target_resume (-1, 0, stop_signal);
wait_for_inferior ();
}
- while (stop_signal != SIGTRAP);
+ while (stop_signal != TARGET_SIGNAL_TRAP);
stop_soon_quietly = 0;
/* We are now either at the "mapping complete" breakpoint (or somewhere
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
}
/*
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
+ 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.
*/
struct so_list *so;
{
#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 = (CORE_ADDR) dynamic_copy.ldd;
+ }
/* Read the debugger structure from the inferior, just to make sure
we have a current copy. */
- read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_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 (debug_copy.ldd_cp, so -> objfile);
+ solib_add_common_symbols (debug_copy.ldd_cp);
}
#endif /* !SVR4_SHARED_LIBS */
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 */
}
projects / deliverable / binutils-gdb.git / blobdiff