-/* 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.
+/* Handle shared libraries for GDB, the GNU Debugger.
-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.
+ Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
-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 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. */
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
#include <sys/types.h>
-#include <signal.h>
-#include <string.h>
-#include <link.h>
-#include <sys/param.h>
#include <fcntl.h>
-
-#ifndef SVR4_SHARED_LIBS
- /* SunOS shared libs need the nlist structure. */
-#include <a.out.h>
-#endif
-
+#include "gdb_string.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"
+#include "completer.h"
+#include "filenames.h" /* for DOSish file names */
-#define MAX_PATH_SIZE 256 /* 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) */
-
-#define BKPT_AT_SYMBOL 1
-
-static char *bkpt_names[] = {
-#ifdef SOLIB_BKPT_NAME
- SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */
-#endif
- "_start",
- "main",
- NULL
-};
+#include "solist.h"
+#include <readline/readline.h>
-/* local data declarations */
+/* external data declarations */
+
+/* FIXME: gdbarch needs to control this variable */
+struct target_so_ops *current_target_so_ops;
-#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)
-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 */
-
-#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)
-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 *bfd;
-};
+/* local data declarations */
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 */
-extern int
-fdmatch PARAMS ((int, int)); /* In libiberty */
+static int solib_cleanup_queued = 0; /* make_run_cleanup called */
/* Local function prototypes */
-static void
-special_symbol_handling PARAMS ((struct so_list *));
+static void do_clear_solib (PTR);
-static void
-sharedlibrary_command PARAMS ((char *, int));
+/* 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;
-static int
-enable_break PARAMS ((void));
+/* 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;
-static int
-disable_break PARAMS ((void));
+/*
-static void
-info_sharedlibrary_command PARAMS ((char *, int));
+ GLOBAL FUNCTION
-static int
-symbol_add_stub PARAMS ((char *));
+ solib_open -- Find a shared library file and open it.
-static struct so_list *
-find_solib PARAMS ((struct so_list *));
+ SYNOPSIS
-static struct link_map *
-first_link_map_member PARAMS ((void));
+ int solib_open (char *in_patname, char **found_pathname);
-static CORE_ADDR
-locate_base PARAMS ((void));
+ DESCRIPTION
-static void
-solib_map_sections PARAMS ((struct so_list *));
+ Global variable SOLIB_ABSOLUTE_PREFIX is used as a prefix directory
+ to search for shared libraries if they have an absolute path.
-#ifdef SVR4_SHARED_LIBS
+ Global variable SOLIB_SEARCH_PATH is used as a prefix directory
+ (or set of directories, as in LD_LIBRARY_PATH) to search for all
+ shared libraries if not found in SOLIB_ABSOLUTE_PREFIX.
-static int
-look_for_base PARAMS ((int, CORE_ADDR));
+ Search order:
+ * If path is absolute, look in SOLIB_ABSOLUTE_PREFIX.
+ * If path is absolute or relative, look for it literally (unmodified).
+ * Look in SOLIB_SEARCH_PATH.
+ * Look in inferior's $PATH.
+ * Look in inferior's $LD_LIBRARY_PATH.
-static CORE_ADDR
-bfd_lookup_symbol PARAMS ((bfd *, char *));
+ RETURNS
-#else
+ file handle for opened solib, or -1 for failure. */
-static void
-solib_add_common_symbols PARAMS ((struct rtc_symb *, struct objfile *));
+int
+solib_open (char *in_pathname, char **found_pathname)
+{
+ int found_file = -1;
+ char *temp_pathname = NULL;
+ char *p = in_pathname;
+
+ while (*p && !IS_DIR_SEPARATOR (*p))
+ p++;
+
+ if (*p)
+ {
+ if (! IS_ABSOLUTE_PATH (in_pathname) || solib_absolute_prefix == NULL)
+ temp_pathname = in_pathname;
+ else
+ {
+ int prefix_len = strlen (solib_absolute_prefix);
+
+ /* Remove trailing slashes from absolute prefix. */
+ while (prefix_len > 0
+ && IS_DIR_SEPARATOR (solib_absolute_prefix[prefix_len - 1]))
+ prefix_len--;
+
+ /* Cat the prefixed pathname together. */
+ temp_pathname = alloca (prefix_len + strlen (in_pathname) + 1);
+ strncpy (temp_pathname, solib_absolute_prefix, prefix_len);
+ temp_pathname[prefix_len] = '\0';
+ strcat (temp_pathname, in_pathname);
+ }
+
+ /* Now see if we can open it. */
+ found_file = open (temp_pathname, O_RDONLY, 0);
+ }
+
+ /* If the search in solib_absolute_prefix failed, and the path name is
+ absolute at this point, make it relative. (openp will try and open the
+ file according to its absolute path otherwise, which is not what we want.)
+ Affects subsequent searches for this solib. */
+ if (found_file < 0 && IS_ABSOLUTE_PATH (in_pathname))
+ {
+ /* First, get rid of any drive letters etc. */
+ while (!IS_DIR_SEPARATOR (*in_pathname))
+ in_pathname++;
+
+ /* Next, get rid of all leading dir separators. */
+ while (IS_DIR_SEPARATOR (*in_pathname))
+ in_pathname++;
+ }
+
+ /* If not found, next search the solib_search_path (if any). */
+ if (found_file < 0 && solib_search_path != NULL)
+ found_file = openp (solib_search_path,
+ 1, in_pathname, O_RDONLY, 0, &temp_pathname);
+
+ /* If not found, next search the solib_search_path (if any) for the basename
+ only (ignoring the path). This is to allow reading solibs from a path
+ that differs from the opened path. */
+ if (found_file < 0 && solib_search_path != NULL)
+ found_file = openp (solib_search_path,
+ 1, lbasename (in_pathname), O_RDONLY, 0,
+ &temp_pathname);
+
+ /* If not found, next search the inferior's $PATH environment variable. */
+ if (found_file < 0 && solib_search_path != NULL)
+ found_file = openp (get_in_environ (inferior_environ, "PATH"),
+ 1, in_pathname, O_RDONLY, 0, &temp_pathname);
+
+ /* If not found, next search the inferior's $LD_LIBRARY_PATH
+ environment variable. */
+ if (found_file < 0 && solib_search_path != NULL)
+ found_file = openp (get_in_environ (inferior_environ, "LD_LIBRARY_PATH"),
+ 1, in_pathname, O_RDONLY, 0, &temp_pathname);
+
+ /* Done. If not found, tough luck. Return found_file and
+ (optionally) found_pathname. */
+ if (found_pathname != NULL && temp_pathname != NULL)
+ *found_pathname = xstrdup (temp_pathname);
+ return found_file;
+}
-#endif
/*
-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 (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);
- old_chain = make_cleanup (free, filename);
-
- scratch_chan = openp (getenv ("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);
- }
+
+ filename = tilde_expand (so->so_name);
+
+ old_chain = make_cleanup (xfree, filename);
+ scratch_chan = solib_open (filename, &scratch_pathname);
+
if (scratch_chan < 0)
{
perror_with_name (filename);
}
- /* Leave scratch_pathname allocated. bfd->name will point to it. */
- abfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan);
+ /* Leave scratch_pathname allocated. abfd->name will point to it. */
+ abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
if (!abfd)
{
close (scratch_chan);
error ("Could not open `%s' as an executable file: %s",
- scratch_pathname, bfd_errmsg (bfd_error));
+ scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
+
/* Leave bfd open, core_xfer_memory and "info files" need it. */
- so -> bfd = abfd;
- abfd -> cacheable = true;
+ so->abfd = abfd;
+ abfd->cacheable = 1;
+
+ /* copy full path name into so_name, so that later symbol_file_add
+ can find it */
+ if (strlen (scratch_pathname) >= SO_NAME_MAX_PATH_SIZE)
+ error ("Full path name length of shared library exceeds SO_NAME_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. */
+ TARGET_SO_RELOCATE_SECTION_ADDRESSES (so, p);
+ 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. */
-
-#ifndef SVR4_SHARED_LIBS
-
-/* This routine can be a real performance hog. According to some gprof data
- time spend in solib_add (up to 20 minutes with 35 shared libraries) is
- spent here, with 5/6 in lookup_minimal_symbol and 1/6 in read_memory.
-
- Possible solutions:
-
- * Hash the minimal symbols.
-
- * Just record the name of the minimal symbol and lazily patch the
- addresses.
-
- * Tell everyone to switch to Solaris2.
-
-(1) Move the call to special_symbol_handling out of the find_solib
-loop in solib_add. This will call it once, rather than 35 times, when
-you have 35 shared libraries. It's in the loop to pass the current
-solib's objfile so the symbols are added to that objfile's minsym.
-But since the symbols are in common (BSS), it doesn't really matter
-which objfile's minsyms they are added to, I think.
-
-(2) Indeed, it might be best to create an objfile just for common minsyms,
-thus not needing any objfile argument to solib_add_common_symbols.
-
-(3) Remove the call to lookup_minimal_symbol from
-solib_add_common_symbols. If a symbol appears multiple times in the
-minsyms, we probably cope, more or less. Note that if we had an
-objfile for just minsyms, install_minimal_symbols would automatically
-remove duplicates caused by running solib_add_common_symbols several
-times.
-*/
-
-static void
-solib_add_common_symbols (rtc_symp, objfile)
- 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;
-
- init_minimal_symbol_collection ();
- make_cleanup (discard_minimal_symbols, 0);
-
- while (rtc_symp)
- {
- read_memory ((CORE_ADDR) rtc_symp,
- (char *) &inferior_rtc_symb,
- sizeof (inferior_rtc_symb));
- read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp,
- (char *) &inferior_rtc_nlist,
- sizeof(inferior_rtc_nlist));
- if (inferior_rtc_nlist.n_type == N_COMM)
- {
- /* FIXME: The length of the symbol name is not available, but in the
- current implementation the common symbol is allocated immediately
- behind the name of the symbol. */
- len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx;
-
- 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. */
-
- if (name[0] == bfd_get_symbol_leading_char (objfile->obfd))
- {
- name++;
- }
-
- /* 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);
- }
- rtc_symp = inferior_rtc_symb.rtc_next;
- }
-
- /* Install any minimal symbols that have been collected as the current
- minimal symbols for this objfile. */
-
- install_minimal_symbols (objfile);
+ return (1);
}
-#endif /* SVR4_SHARED_LIBS */
-
-#ifdef SVR4_SHARED_LIBS
-
-/*
-
-LOCAL FUNCTION
+/* LOCAL FUNCTION
- bfd_lookup_symbol -- lookup the value for a specific symbol
+ free_so --- free a `struct so_list' object
-SYNOPSIS
+ SYNOPSIS
- CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
+ void free_so (struct so_list *so)
-DESCRIPTION
+ DESCRIPTION
- An expensive way to lookup the value of a single symbol for
- bfd's that are only temporary anyway. This is used by the
- shared library support to find the address of the debugger
- interface structures in the shared library.
+ Free the storage associated with the `struct so_list' object SO.
+ If we have opened a BFD for SO, close it.
- Note that 0 is specifically allowed as an error return (no
- such symbol).
+ 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.
- 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.
-*/
+ 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 CORE_ADDR
-bfd_lookup_symbol (abfd, symname)
- bfd *abfd;
- char *symname;
+void
+free_so (struct so_list *so)
{
- unsigned int storage_needed;
- asymbol *sym;
- asymbol **symbol_table;
- unsigned int number_of_symbols;
- unsigned int i;
- struct cleanup *back_to;
- CORE_ADDR symaddr = 0;
-
- storage_needed = get_symtab_upper_bound (abfd);
+ char *bfd_filename = 0;
- if (storage_needed > 0)
+ if (so->sections)
+ xfree (so->sections);
+
+ if (so->abfd)
{
- symbol_table = (asymbol **) xmalloc (storage_needed);
- back_to = make_cleanup (free, (PTR)symbol_table);
- number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
-
- for (i = 0; i < number_of_symbols; i++)
- {
- sym = *symbol_table++;
- if (STREQ (sym -> name, symname))
- {
- /* Bfd symbols are section relative. */
- symaddr = sym -> value + sym -> section -> vma;
- break;
- }
- }
- do_cleanups (back_to);
+ bfd_filename = bfd_get_filename (so->abfd);
+ if (! bfd_close (so->abfd))
+ warning ("cannot close \"%s\": %s",
+ bfd_filename, bfd_errmsg (bfd_get_error ()));
}
- return (symaddr);
-}
-
-/*
-LOCAL FUNCTION
+ if (bfd_filename)
+ xfree (bfd_filename);
- look_for_base -- examine file for each mapped address segment
+ TARGET_SO_FREE_SO (so);
-SYNOPSYS
-
- static int look_for_base (int fd, CORE_ADDR baseaddr)
-
-DESCRIPTION
-
- This function is passed to proc_iterate_over_mappings, which
- causes it to get called once for each mapped address space, with
- an open file descriptor for the file mapped to that space, and the
- base address of that mapped space.
+ xfree (so);
+}
- 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.
- 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.
- */
+/* A small stub to get us past the arg-passing pinhole of catch_errors. */
static int
-look_for_base (fd, baseaddr)
- int fd;
- CORE_ADDR baseaddr;
+symbol_add_stub (PTR arg)
{
- bfd *interp_bfd;
- CORE_ADDR address;
+ register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
+ struct section_addr_info *sap;
- /* 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))
+ /* Have we already loaded this shared object? */
+ ALL_OBJFILES (so->objfile)
{
- return (0);
+ if (strcmp (so->objfile->name, so->so_name) == 0)
+ return 1;
}
- /* Try to open whatever random file this fd corresponds to. Note that
- we have no way currently to find the filename. Don't gripe about
- any problems we might have, just fail. */
-
- if ((interp_bfd = bfd_fdopenr ("unnamed", NULL, fd)) == NULL)
- {
- return (0);
- }
- if (!bfd_check_format (interp_bfd, bfd_object))
- {
- bfd_close (interp_bfd);
- return (0);
- }
+ sap = build_section_addr_info_from_section_table (so->sections,
+ so->sections_end);
- /* 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. */
+ so->objfile = symbol_file_add (so->so_name, so->from_tty,
+ sap, 0, OBJF_SHARED);
+ free_section_addr_info (sap);
- if ((address = bfd_lookup_symbol (interp_bfd, DEBUG_BASE)) == 0)
- {
- bfd_close (interp_bfd);
- return (0);
- }
-
- /* Eureka! We found the symbol. But now we may need to relocate it
- by the base address. If the symbol's value is less than the base
- address of the shared library, then it hasn't yet been relocated
- by the dynamic linker, and we have to do it ourself. FIXME: Note
- that we make the assumption that the first segment that corresponds
- to the shared library has the base address to which the library
- was relocated. */
-
- if (address < baseaddr)
- {
- address += baseaddr;
- }
- debug_base = address;
- bfd_close (interp_bfd);
return (1);
}
-#endif
-/*
-
-LOCAL FUNCTION
+/* LOCAL FUNCTION
- locate_base -- locate the base address of dynamic linker structs
+ update_solib_list --- synchronize GDB's shared object list with inferior's
-SYNOPSIS
+ SYNOPSIS
- CORE_ADDR locate_base (void)
+ void update_solib_list (int from_tty, struct target_ops *TARGET)
-DESCRIPTION
+ 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.
- 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).
+ If we notice that the inferior has unloaded some shared objects,
+ free any symbolic info GDB had read about those shared objects.
- 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.
+ Don't load symbolic info for any new shared objects; just add them
+ to the list, and leave their symbols_loaded flag clear.
- 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.
+ If FROM_TTY is non-null, feel free to print messages about what
+ we're doing.
- 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).
+ 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. */
- */
-
-static CORE_ADDR
-locate_base ()
+void
+update_solib_list (int from_tty, struct target_ops *target)
{
+ struct so_list *inferior = TARGET_SO_CURRENT_SOS ();
+ struct so_list *gdb, **gdb_link;
+
+ /* 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 (TARGET_SO_OPEN_SYMBOL_FILE_OBJECT, (PTR) &from_tty,
+ "Error reading attached process's symbol file.\n",
+ RETURN_MASK_ALL);
+
+ /* Since this function might actually add some elements to the
+ so_list_head list, arrange for it to be cleaned up when
+ appropriate. */
+ if (!solib_cleanup_queued)
+ {
+ make_run_cleanup (do_clear_solib, NULL);
+ solib_cleanup_queued = 1;
+ }
+
+ /* GDB and the inferior's dynamic linker each maintain their own
+ list of currently loaded shared objects; we want to bring the
+ former in sync with the latter. Scan both lists, seeing which
+ shared objects appear where. There are three cases:
+
+ - A shared object appears on both lists. This means that GDB
+ knows about it already, and it's still loaded in the inferior.
+ Nothing needs to happen.
+
+ - A shared object appears only on GDB's list. This means that
+ the inferior has unloaded it. We should remove the shared
+ object from GDB's tables.
+
+ - A shared object appears only on the inferior's list. This
+ means that it's just been loaded. We should add it to GDB's
+ tables.
+
+ So we walk GDB's list, checking each entry to see if it appears
+ in the inferior's list too. If it does, no action is needed, and
+ we remove it from the inferior's list. If it doesn't, the
+ inferior has unloaded it, and we remove it from GDB's list. By
+ the time we're done walking GDB's list, the inferior's list
+ contains only the new shared objects, which we then add. */
+
+ gdb = so_list_head;
+ gdb_link = &so_list_head;
+ while (gdb)
+ {
+ struct so_list *i = inferior;
+ struct so_list **i_link = &inferior;
+
+ /* Check to see whether the shared object *gdb also appears in
+ the inferior's current list. */
+ while (i)
+ {
+ if (! strcmp (gdb->so_original_name, i->so_original_name))
+ break;
-#ifndef SVR4_SHARED_LIBS
-
- struct minimal_symbol *msymbol;
- CORE_ADDR address = 0;
+ i_link = &i->next;
+ i = *i_link;
+ }
- /* 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. */
+ /* 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;
+ }
- msymbol = lookup_minimal_symbol (DEBUG_BASE, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
- {
- address = SYMBOL_VALUE_ADDRESS (msymbol);
- }
- return (address);
+ /* If it's not on the inferior's list, remove it from GDB's tables. */
+ else
+ {
+ *gdb_link = gdb->next;
-#else /* SVR4_SHARED_LIBS */
+ /* Unless the user loaded it explicitly, free SO's objfile. */
+ if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED))
+ free_objfile (gdb->objfile);
- /* 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. */
+ /* Some targets' section tables might be referring to
+ sections from so->abfd; remove them. */
+ remove_target_sections (gdb->abfd);
- if (debug_base == 0)
- {
- proc_iterate_over_mappings (look_for_base);
+ free_so (gdb);
+ gdb = *gdb_link;
+ }
}
- return (debug_base);
-
-#endif /* !SVR4_SHARED_LIBS */
-
-}
-
-/*
-
-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 ()
-{
- struct link_map *lm = NULL;
-
-#ifndef SVR4_SHARED_LIBS
-
- read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy));
- if (dynamic_copy.ld_version >= 2)
+ /* 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)
{
- /* 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;
- }
-
-#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 */
-
- return (lm);
-}
-
-/*
-
-LOCAL FUNCTION
+ struct so_list *i;
- find_solib -- step through list of shared objects
+ /* Add the new shared objects to GDB's list. */
+ *gdb_link = inferior;
-SYNOPSIS
-
- struct so_list *find_solib (struct so_list *so_list_ptr)
-
-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.
-
- The arg and return value are "struct link_map" pointers, as defined
- in <link.h>.
- */
-
-static struct so_list *
-find_solib (so_list_ptr)
- struct so_list *so_list_ptr; /* Last lm or NULL for first one */
-{
- struct so_list *so_list_next = NULL;
- struct link_map *lm = NULL;
- struct so_list *new;
-
- if (so_list_ptr == NULL)
- {
- /* We are setting up for a new scan through the loaded images. */
- if ((so_list_next = so_list_head) == NULL)
+ /* Fill in the rest of each of the `struct so_list' nodes. */
+ for (i = inferior; i; i = i->next)
{
- /* 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)
+ 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 object's sections to the TARGET's
+ section table. Do this immediately after mapping the object so
+ that later nodes in the list can query this object, as is needed
+ in solib-osf.c. */
+ if (target)
{
- /* Read the base structure in and find the address of the first
- link map list member. */
- lm = first_link_map_member ();
- }
- }
- }
- else
- {
- /* 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)
- {
- /* 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)
- {
- lm = LM_NEXT (so_list_ptr);
- }
- else
- {
- lm = NULL;
+ int count = (i->sections_end - i->sections);
+ if (count > 0)
+ {
+ int space = target_resize_to_sections (target, count);
+ memcpy (target->to_sections + space,
+ i->sections,
+ count * sizeof (i->sections[0]));
+ }
}
}
- 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);
- }
}
- return (so_list_next);
}
-/* A small stub to get us past the arg-passing pinhole of catch_errors. */
-static int
-symbol_add_stub (arg)
- char *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);
- return (1);
-}
+/* GLOBAL FUNCTION
-/*
+ solib_add -- read in symbol info for newly added shared libraries
-GLOBAL FUNCTION
+ SYNOPSIS
- solib_add -- add a shared library file to the symtab and section list
+ void solib_add (char *pattern, int from_tty, struct target_ops
+ *TARGET, int readsyms)
-SYNOPSIS
+ DESCRIPTION
- void solib_add (char *arg_string, int from_tty,
- struct target_ops *target)
+ 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.
-DESCRIPTION
+ If READSYMS is 0, defer reading symbolic information until later
+ but still do any needed low level processing.
-*/
+ FROM_TTY and TARGET are as described for update_solib_list, above. */
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 */
- char *re_err;
- int count;
- int old;
-
- if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
+solib_add (char *pattern, int from_tty, struct target_ops *target, int readsyms)
+{
+ struct so_list *gdb;
+
+ if (pattern)
{
- error ("Invalid regexp: %s", re_err);
+ char *re_err = re_comp (pattern);
+
+ if (re_err)
+ 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))
+
+ 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))
{
- so -> from_tty = from_tty;
- if (so -> symbols_loaded)
+ any_matches = 1;
+
+ if (gdb->symbols_loaded)
{
if (from_tty)
- {
- printf ("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))
- {
- special_symbol_handling (so);
- so -> symbols_loaded = 1;
- }
- }
- }
-
- /* Now add the shared library sections to the section table of the
- specified target, if any. */
- if (target)
- {
- /* Count how many new section_table entries there are. */
- so = NULL;
- count = 0;
- while ((so = find_solib (so)) != NULL)
- {
- if (so -> so_name[0])
- {
- count += so -> sections_end - so -> sections;
- }
- }
-
- if (count)
- {
- /* Reallocate the target's section table including the new size. */
- if (target -> to_sections)
- {
- old = target -> to_sections_end - target -> to_sections;
- target -> to_sections = (struct section_table *)
- realloc ((char *)target -> to_sections,
- (sizeof (struct section_table)) * (count + old));
+ printf_unfiltered ("Symbols already loaded for %s\n",
+ gdb->so_name);
}
- else
+ else if (readsyms)
{
- old = 0;
- target -> to_sections = (struct section_table *)
- malloc ((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;
}
}
}
- }
+
+ if (from_tty && pattern && ! any_matches)
+ printf_unfiltered
+ ("No loaded shared libraries match the pattern `%s'.\n", pattern);
+
+ if (loaded_any_symbols)
+ {
+ /* Getting new symbols may change our opinion about what is
+ frameless. */
+ reinit_frame_cache ();
+
+ TARGET_SO_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;
+info_sharedlibrary_command (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;
-
- if (exec_bfd == NULL)
+ int addr_width;
+ char *addr_fmt;
+
+ if (TARGET_PTR_BIT == 32)
{
- printf ("No exec file.\n");
- return;
+ addr_width = 8 + 4;
+ addr_fmt = "08l";
}
- while ((so = find_solib (so)) != NULL)
+ else if (TARGET_PTR_BIT == 64)
{
- if (so -> so_name[0])
+ addr_width = 16 + 4;
+ addr_fmt = "016l";
+ }
+ else
+ {
+ internal_error (__FILE__, __LINE__,
+ "TARGET_PTR_BIT returned unknown size %d",
+ TARGET_PTR_BIT);
+ }
+
+ update_solib_list (from_tty, 0);
+
+ for (so = so_list_head; so; so = so->next)
+ {
+ 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,
+ so->textsection != NULL
+ ? local_hex_string_custom (
+ (LONGEST) so->textsection->addr,
+ addr_fmt)
+ : "");
+ printf_unfiltered ("%-*s", addr_width,
+ so->textsection != NULL
+ ? local_hex_string_custom (
+ (LONGEST) so->textsection->endaddr,
+ 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");
}
}
/*
-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.
- 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
-solib_address (address)
- CORE_ADDR address;
+char *
+solib_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])
+ struct section_table *p;
+
+ for (p = so->sections; p < so->sections_end; p++)
{
- if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
- (address < (CORE_ADDR) so -> lmend))
- {
- return (1);
- }
+ if (p->addr <= address && address < p->endaddr)
+ return (so->so_name);
}
}
+
return (0);
}
/* Called by free_all_symtabs */
-void
-clear_solib()
-{
- struct so_list *next;
- char *bfd_filename;
-
- while (so_list_head)
- {
- if (so_list_head -> sections)
- {
- free ((PTR)so_list_head -> sections);
- }
- if (so_list_head -> bfd)
- {
- bfd_filename = bfd_get_filename (so_list_head -> bfd);
- bfd_close (so_list_head -> bfd);
- }
- 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;
- }
- debug_base = 0;
-}
-
-/*
-
-LOCAL FUNCTION
-
- disable_break -- remove the "mapping changed" breakpoint
-
-SYNOPSIS
-
- static int disable_break ()
-
-DESCRIPTION
-
- Removes the breakpoint that gets hit when the dynamic linker
- completes a mapping change.
-
-*/
-
-static int
-disable_break ()
+void
+clear_solib (void)
{
- int status = 1;
-
-#ifndef SVR4_SHARED_LIBS
-
- int in_debugger = 0;
-
- /* Read the debugger structure from the inferior to retrieve the
- address of the breakpoint and the original contents of the
- breakpoint address. Remove the breakpoint by writing the original
- contents back. */
-
- read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy));
-
- /* Set `in_debugger' to zero now. */
-
- write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
-
- breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr;
- write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst,
- sizeof (debug_copy.ldd_bp_inst));
-
-#else /* SVR4_SHARED_LIBS */
-
- /* Note that breakpoint address and original contents are in our address
- space, so we just need to write the original contents back. */
-
- if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
- {
- status = 0;
- }
-
-#endif /* !SVR4_SHARED_LIBS */
-
- /* For the SVR4 version, we always know the breakpoint address. For the
- SunOS version we don't know it until the above code is executed.
- Grumble if we are stopped anywhere besides the breakpoint address. */
+ /* 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);
- if (stop_pc != breakpoint_addr)
+ while (so_list_head)
{
- warning ("stopped at unknown breakpoint while handling shared libraries");
+ struct so_list *so = so_list_head;
+ so_list_head = so->next;
+ if (so->abfd)
+ remove_target_sections (so->abfd);
+ free_so (so);
}
- return (status);
+ TARGET_SO_CLEAR_SOLIB ();
}
-/*
-
-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 ()
+static void
+do_clear_solib (PTR dummy)
{
- int success = 0;
-
-#ifndef SVR4_SHARED_LIBS
-
- int j;
- int in_debugger;
-
- /* Get link_dynamic structure */
-
- j = target_read_memory (debug_base, (char *) &dynamic_copy,
- sizeof (dynamic_copy));
- if (j)
- {
- /* unreadable */
- return (0);
- }
-
- /* Calc address of debugger interface structure */
-
- debug_addr = (CORE_ADDR) dynamic_copy.ldd;
-
- /* Calc address of `in_debugger' member of debugger interface structure */
-
- flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger -
- (char *) &debug_copy);
-
- /* Write a value of 1 to this member. */
-
- in_debugger = 1;
- write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
- success = 1;
+ solib_cleanup_queued = 0;
+ clear_solib ();
+}
-#else /* SVR4_SHARED_LIBS */
+/* GLOBAL FUNCTION
-#ifdef BKPT_AT_SYMBOL
+ solib_create_inferior_hook -- shared library startup support
- struct minimal_symbol *msymbol;
- char **bkpt_namep;
- CORE_ADDR bkpt_addr;
+ SYNOPSIS
- /* Scan through the list of symbols, trying to look up the symbol and
- set a breakpoint there. Terminate loop when we/if we succeed. */
+ void solib_create_inferior_hook()
- breakpoint_addr = 0;
- for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++)
- {
- msymbol = lookup_minimal_symbol (*bkpt_namep, 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;
- }
- }
- }
+ DESCRIPTION
-#else /* !BKPT_AT_SYMBOL */
+ 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. */
- struct symtab_and_line sal;
+void
+solib_create_inferior_hook (void)
+{
+ TARGET_SO_SOLIB_CREATE_INFERIOR_HOOK ();
+}
- /* Read the debugger interface structure directly. */
+/* GLOBAL FUNCTION
- read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy));
+ in_solib_dynsym_resolve_code -- check to see if an address is in
+ dynamic loader's dynamic symbol
+ resolution code
- /* 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). */
+ SYNOPSIS
- warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__);
- success = 1;
+ int in_solib_dynsym_resolve_code (CORE_ADDR pc)
-#endif /* BKPT_AT_SYMBOL */
+ DESCRIPTION
-#endif /* !SVR4_SHARED_LIBS */
+ Determine if PC is in the dynamic linker's symbol resolution
+ code. Return 1 if so, 0 otherwise.
+*/
- 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()
+int
+in_solib_dynsym_resolve_code (CORE_ADDR pc)
{
- /* 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 ())
- {
- warning ("shared library handler failed to enable breakpoint");
- return;
- }
-
- /* 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;
- do
- {
- target_resume (0, stop_signal);
- wait_for_inferior ();
- }
- while (stop_signal != SIGTRAP);
- stop_soon_quietly = 0;
-
- /* We are now either at the "mapping complete" breakpoint (or somewhere
- else, a condition we aren't prepared to deal with anyway), so adjust
- the PC as necessary after a breakpoint, disable the breakpoint, and
- add any shared libraries that were mapped in. */
-
- if (DECR_PC_AFTER_BREAK)
- {
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- }
-
- if (!disable_break ())
- {
- warning ("shared library handler failed to disable breakpoint");
- }
-
- solib_add ((char *) 0, 0, (struct target_ops *) 0);
+ return TARGET_SO_IN_DYNSYM_RESOLVE_CODE (pc);
}
/*
-LOCAL FUNCTION
-
- special_symbol_handling -- additional shared library symbol handling
+ LOCAL FUNCTION
-SYNOPSIS
+ sharedlibrary_command -- handle command to explicitly add library
- void special_symbol_handling (struct so_list *so)
+ SYNOPSIS
-DESCRIPTION
+ static void sharedlibrary_command (char *args, int from_tty)
- 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.
+ DESCRIPTION
- 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.
-
-*/
+ */
static void
-special_symbol_handling (so)
-struct so_list *so;
+sharedlibrary_command (char *args, int from_tty)
{
-#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. */
-
- 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);
- }
-
-#endif /* !SVR4_SHARED_LIBS */
+ dont_repeat ();
+ solib_add (args, from_tty, (struct target_ops *) 0, 1);
}
+/* LOCAL FUNCTION
-/*
-
-LOCAL FUNCTION
-
- sharedlibrary_command -- handle command to explicitly add library
+ no_shared_libraries -- handle command to explicitly discard symbols
+ from shared libraries.
-SYNOPSIS
+ DESCRIPTION
- static void sharedlibrary_command (char *args, int from_tty)
-
-DESCRIPTION
-
-*/
+ Implements the command "nosharedlibrary", which discards symbols
+ that have been auto-loaded from shared libraries. Symbols from
+ shared libraries that were added by explicit request of the user
+ are not discarded. Also called from remote.c. */
-static void
-sharedlibrary_command (args, from_tty)
-char *args;
-int from_tty;
+void
+no_shared_libraries (char *ignored, int from_tty)
{
- dont_repeat ();
- solib_add (args, from_tty, (struct target_ops *) 0);
+ objfile_purge_solibs ();
+ do_clear_solib (NULL);
}
void
-_initialize_solib()
+_initialize_solib (void)
{
-
+ struct cmd_list_element *c;
+
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_com ("nosharedlibrary", class_files, no_shared_libraries,
+ "Unload all shared object library symbols.");
+
+ add_show_from_set
+ (add_set_cmd ("auto-solib-add", class_support, var_boolean,
+ (char *) &auto_solib_add,
+ "Set autoloading of shared library symbols.\n\
+If \"on\", symbols from all shared object libraries will be loaded\n\
+automatically when the inferior begins execution, when the dynamic linker\n\
+informs gdb that a new library has been loaded, or when attaching to the\n\
+inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'.",
+ &setlist),
+ &showlist);
+
+ c = 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);
+ add_show_from_set (c, &showlist);
+ set_cmd_completer (c, filename_completer);
+
+ c = 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);
+ add_show_from_set (c, &showlist);
+ set_cmd_completer (c, filename_completer);
}
projects / binutils.git / blobdiff