diff options
Diffstat (limited to 'gnu/usr.bin/binutils/gdb/solib.c')
| -rw-r--r-- | gnu/usr.bin/binutils/gdb/solib.c | 2089 |
1 files changed, 609 insertions, 1480 deletions
diff --git a/gnu/usr.bin/binutils/gdb/solib.c b/gnu/usr.bin/binutils/gdb/solib.c index 041cd2acd5a..a98c3bdfed7 100644 --- a/gnu/usr.bin/binutils/gdb/solib.c +++ b/gnu/usr.bin/binutils/gdb/solib.c @@ -1,46 +1,30 @@ -/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. - Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996 - 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, 2003 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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. -#include "defs.h" - -/* This file is only compilable if link.h is available. */ + 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. */ -#ifdef HAVE_LINK_H +#include "defs.h" #include <sys/types.h> -#include <signal.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 "gdb_string.h" #include "symtab.h" #include "bfd.h" #include "symfile.h" @@ -49,250 +33,213 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "command.h" #include "target.h" #include "frame.h" -#include "gnu-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 */ +#include "exec.h" +#include "solist.h" +#include "readline/readline.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", - NULL -}; -#endif - -#define BKPT_AT_SYMBOL 1 - -#if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) -static char *bkpt_names[] = { -#ifdef SOLIB_BKPT_NAME - SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ -#endif - "_start", - "main", - NULL -}; -#endif - -/* Symbols which are used to locate the base of the link map structures. */ - -#ifndef SVR4_SHARED_LIBS -static char *debug_base_symbols[] = { - "_DYNAMIC", - "_DYNAMIC__MGC", - NULL -}; -#endif - -static char *main_name_list[] = { - "main_$main", - NULL -}; +/* external data declarations */ -/* local data declarations */ +/* FIXME: gdbarch needs to control this variable */ +struct target_so_ops *current_target_so_ops; -#ifndef SVR4_SHARED_LIBS - -#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; -static CORE_ADDR debug_addr; -static CORE_ADDR flag_addr; - -#else /* SVR4_SHARED_LIBS */ - -#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 */ - -#endif /* !SVR4_SHARED_LIBS */ - -struct so_list { - struct so_list *next; /* next structure in linked list */ - struct link_map lm; /* copy of link map from inferior */ - struct link_map *lmaddr; /* addr in inferior lm was read from */ - CORE_ADDR lmend; /* upper addr bound of mapped object */ - char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ - char symbols_loaded; /* flag: symbols read in yet? */ - char from_tty; /* flag: print msgs? */ - struct objfile *objfile; /* objfile for loaded lib */ - struct section_table *sections; - struct section_table *sections_end; - struct section_table *textsection; - bfd *abfd; -}; +/* 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 int -match_main PARAMS ((char *)); +static void do_clear_solib (void *); -static void -special_symbol_handling PARAMS ((struct so_list *)); +/* 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 void -sharedlibrary_command PARAMS ((char *, int)); +/* 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 -enable_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 CORE_ADDR -elf_locate_base PARAMS ((void)); + Search algorithm: + * If there is a solib_absolute_prefix and path is absolute: + * Search for solib_absolute_prefix/path. + * else + * Look for it literally (unmodified). + * Look in SOLIB_SEARCH_PATH. + * If available, use target defined search function. + * If solib_absolute_prefix is NOT set, perform the following two searches: + * Look in inferior's $PATH. + * Look in inferior's $LD_LIBRARY_PATH. + * + * The last check avoids doing this search when targetting remote + * machines since solib_absolute_prefix will almost always be set. -#else + RETURNS -static int -disable_break PARAMS ((void)); + file handle for opened solib, or -1 for failure. */ -static void -allocate_rt_common_objfile PARAMS ((void)); +int +solib_open (char *in_pathname, char **found_pathname) +{ + int found_file = -1; + char *temp_pathname = NULL; + char *p = in_pathname; -static void -solib_add_common_symbols PARAMS ((struct rtc_symb *)); + while (*p && !IS_DIR_SEPARATOR (*p)) + p++; -#endif + 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); + } -/* 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; + /* 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, 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, try to use target supplied solib search method */ + if (found_file < 0 && TARGET_SO_FIND_AND_OPEN_SOLIB != NULL) + found_file = TARGET_SO_FIND_AND_OPEN_SOLIB + (in_pathname, O_RDONLY, &temp_pathname); + + /* If not found, next search the inferior's $PATH environment variable. */ + if (found_file < 0 && solib_absolute_prefix == 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_absolute_prefix == 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; +} -/* If non-empty, this is a search path for loading non-absolute shared library - symbol files. This takes precedence over the environment variables PATH - and LD_LIBRARY_PATH. */ -static char *solib_search_path = NULL; /* -LOCAL FUNCTION + LOCAL FUNCTION - solib_map_sections -- open bfd and build sections for shared lib + solib_map_sections -- open bfd and build sections for shared lib -SYNOPSIS + SYNOPSIS - static void solib_map_sections (struct so_list *so) + static int solib_map_sections (struct so_list *so) -DESCRIPTION + DESCRIPTION - Given a pointer to one of the shared objects in our list - of mapped objects, use the recorded name to open a bfd - descriptor for the object, build a section table, and then - relocate all the section addresses by the base address at - which the shared object was mapped. + Given a pointer to one of the shared objects in our list + of mapped objects, use the recorded name to open a bfd + descriptor for the object, build a section table, and then + relocate all the section addresses by the base address at + which the shared object was mapped. -FIXMES + FIXMES - In most (all?) cases the shared object file name recorded in the - dynamic linkage tables will be a fully qualified pathname. For - cases where it isn't, do we really mimic the systems search - mechanism correctly in the below code (particularly the tilde - expansion stuff?). + In most (all?) cases the shared object file name recorded in the + dynamic linkage tables will be a fully qualified pathname. For + cases where it isn't, do we really mimic the systems search + mechanism correctly in the below code (particularly the tilde + expansion stuff?). */ -static void -solib_map_sections (so) - struct so_list *so; +static int +solib_map_sections (void *arg) { + struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ char *filename; char *scratch_pathname; int scratch_chan; struct section_table *p; struct cleanup *old_chain; bfd *abfd; - - filename = tilde_expand (so -> so_name); - - if (solib_absolute_prefix && ROOTED_P (filename)) - /* Prefix shared libraries with absolute filenames with - SOLIB_ABSOLUTE_PREFIX. */ - { - char *pfxed_fn; - int pfx_len; - - pfx_len = strlen (solib_absolute_prefix); - /* Remove trailing slashes. */ - while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1])) - pfx_len--; + filename = tilde_expand (so->so_name); - pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1); - strcpy (pfxed_fn, solib_absolute_prefix); - strcat (pfxed_fn, filename); - free (filename); + old_chain = make_cleanup (xfree, filename); + scratch_chan = solib_open (filename, &scratch_pathname); - filename = pfxed_fn; - } - - old_chain = make_cleanup (free, filename); - - scratch_chan = -1; - - if (solib_search_path) - scratch_chan = openp (solib_search_path, - 1, filename, O_RDONLY, 0, &scratch_pathname); - if (scratch_chan < 0) - scratch_chan = openp (get_in_environ (inferior_environ, "PATH"), - 1, filename, O_RDONLY, 0, &scratch_pathname); - if (scratch_chan < 0) - { - scratch_chan = openp (get_in_environ - (inferior_environ, "LD_LIBRARY_PATH"), - 1, filename, O_RDONLY, 0, &scratch_pathname); - } if (scratch_chan < 0) { perror_with_name (filename); } - /* Leave scratch_pathname allocated. abfd->name will point to it. */ + /* Leave scratch_pathname allocated. abfd->name will point to it. */ abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); if (!abfd) { @@ -300,14 +247,15 @@ solib_map_sections (so) error ("Could not open `%s' as an executable file: %s", scratch_pathname, bfd_errmsg (bfd_get_error ())); } + /* Leave bfd open, core_xfer_memory and "info files" need it. */ - so -> abfd = abfd; - abfd -> cacheable = TRUE; + so->abfd = abfd; + bfd_set_cacheable (abfd, 1); - /* 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."); + /* 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)) @@ -315,1469 +263,650 @@ solib_map_sections (so) error ("\"%s\": not in executable format: %s.", 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", + 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 -> the_bfd_section -> name, ".text")) + object's file by the base address to which the object was actually + mapped. */ + TARGET_SO_RELOCATE_SECTION_ADDRESSES (so, p); + if (strcmp (p->the_bfd_section->name, ".text") == 0) { - so -> textsection = p; + so->textsection = p; } } /* Free the file names, close the file now. */ do_cleanups (old_chain); -} - -#ifndef SVR4_SHARED_LIBS - -/* Allocate the runtime common object file. */ -static void -allocate_rt_common_objfile () -{ - struct objfile *objfile; - struct objfile *last_one; - - objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); - memset (objfile, 0, sizeof (struct objfile)); - objfile -> md = NULL; - obstack_specify_allocation (&objfile -> psymbol_cache.cache, 0, 0, - xmalloc, free); - obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc, - free); - obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc, - free); - obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc, - free); - objfile -> name = mstrsave (objfile -> md, "rt_common"); - - /* Add this file onto the tail of the linked list of other such files. */ - - objfile -> next = NULL; - if (object_files == NULL) - object_files = objfile; - else - { - for (last_one = object_files; - last_one -> next; - last_one = last_one -> next); - last_one -> next = objfile; - } - - rt_common_objfile = objfile; -} - -/* Read all dynamically loaded common symbol definitions from the inferior - and put them into the minimal symbol table for the runtime common - objfile. */ - -static void -solib_add_common_symbols (rtc_symp) - struct rtc_symb *rtc_symp; -{ - struct rtc_symb inferior_rtc_symb; - struct nlist inferior_rtc_nlist; - int len; - char *name; - - /* Remove any runtime common symbols from previous runs. */ - - if (rt_common_objfile != NULL && rt_common_objfile -> minimal_symbol_count) - { - obstack_free (&rt_common_objfile -> symbol_obstack, 0); - obstack_specify_allocation (&rt_common_objfile -> symbol_obstack, 0, 0, - xmalloc, free); - rt_common_objfile -> minimal_symbol_count = 0; - rt_common_objfile -> msymbols = NULL; - } - - init_minimal_symbol_collection (); - make_cleanup (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; - - name = xmalloc (len); - read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len); - - /* Allocate the runtime common objfile if necessary. */ - if (rt_common_objfile == NULL) - allocate_rt_common_objfile (); - - prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, - mst_bss, rt_common_objfile); - free (name); - } - rtc_symp = inferior_rtc_symb.rtc_next; - } - - /* Install any minimal symbols that have been collected as the current - minimal symbols for the runtime common objfile. */ - - install_minimal_symbols (rt_common_objfile); + return (1); } -#endif /* SVR4_SHARED_LIBS */ +/* LOCAL FUNCTION + free_so --- free a `struct so_list' object -#ifdef SVR4_SHARED_LIBS + SYNOPSIS -static CORE_ADDR -bfd_lookup_symbol PARAMS ((bfd *, char *)); + void free_so (struct so_list *so) -/* + DESCRIPTION -LOCAL FUNCTION + Free the storage associated with the `struct so_list' object SO. + If we have opened a BFD for SO, close it. - bfd_lookup_symbol -- lookup the value for a specific 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. -SYNOPSIS + 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. */ - CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) - -DESCRIPTION - - An expensive way to lookup the value of a single symbol for - bfd's that are only temporary anyway. This is used by the - shared library support to find the address of the debugger - interface structures in the shared library. - - Note that 0 is specifically allowed as an error return (no - such symbol). -*/ - -static CORE_ADDR -bfd_lookup_symbol (abfd, symname) - bfd *abfd; - char *symname; +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 = bfd_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); -} - -#ifdef HANDLE_SVR4_EXEC_EMULATORS - -/* - Solaris BCP (the part of Solaris which allows it to run SunOS4 - a.out files) throws in another wrinkle. Solaris does not fill - in the usual a.out link map structures when running BCP programs, - the only way to get at them is via groping around in the dynamic - linker. - The dynamic linker and it's structures are located in the shared - C library, which gets run as the executable's "interpreter" by - the kernel. - - Note that we can assume nothing about the process state at the time - we need to find these structures. We may be stopped on the first - instruction of the interpreter (C shared library), the first - instruction of the executable itself, or somewhere else entirely - (if we attached to the process for example). -*/ - -static char *debug_base_symbols[] = { - "r_debug", /* Solaris 2.3 */ - "_r_debug", /* Solaris 2.1, 2.2 */ - NULL -}; - -static int -look_for_base PARAMS ((int, CORE_ADDR)); - -/* - -LOCAL FUNCTION - look_for_base -- examine file for each mapped address segment + if (bfd_filename) + xfree (bfd_filename); -SYNOPSYS + TARGET_SO_FREE_SO (so); - 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 debug base symbol in the file that this - fd is open on, if it exists, and if so, initialize the dynamic - linker structure base address debug_base. - Note that this is a computationally expensive proposition, since - we basically have to open a bfd on every call, so we specifically - avoid opening the exec file. - */ +/* 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 (void *arg) { - bfd *interp_bfd; - CORE_ADDR address = 0; - char **symbolp; + 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 - || (exec_bfd != NULL - && fdmatch (fileno ((GDB_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", 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); - } + 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); - for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) - { - address = bfd_lookup_symbol (interp_bfd, *symbolp); - if (address != 0) - { - break; - } - } - if (address == 0) - { - /* FIXME-leak: on failure, might not free all memory associated with - interp_bfd. */ - bfd_close (interp_bfd); - return (0); - } - - /* Eureka! We found the symbol. But now we may need to relocate it - by the base address. If the symbol's value is less than the base - address of the shared library, then it hasn't yet been relocated - by the dynamic linker, and we have to do it ourself. FIXME: Note - that we make the assumption that the first segment that corresponds - to the shared library has the base address to which the library - was relocated. */ - - if (address < baseaddr) - { - address += baseaddr; - } - debug_base = address; - /* FIXME-leak: on failure, might not free all memory associated with - interp_bfd. */ - bfd_close (interp_bfd); return (1); } -#endif /* HANDLE_SVR4_EXEC_EMULATORS */ -/* -LOCAL FUNCTION +/* LOCAL FUNCTION - elf_locate_base -- locate the base address of dynamic linker structs - for SVR4 elf targets. + update_solib_list --- synchronize GDB's shared object list with inferior's -SYNOPSIS + SYNOPSIS - CORE_ADDR elf_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 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. + If we notice that the inferior has unloaded some shared objects, + free any symbolic info GDB had read about those shared objects. - */ + Don't load symbolic info for any new shared objects; just add them + to the list, and leave their symbols_loaded flag clear. -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. */ - /* FIXME: In lack of a 64 bit ELF ABI the following code assumes - a 32 bit ELF ABI target. */ - 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 - } + If FROM_TTY is non-null, feel free to print messages about what + we're doing. - /* DT_DEBUG entry not found. */ - return 0; -} - -#endif /* SVR4_SHARED_LIBS */ - -/* - -LOCAL FUNCTION - - locate_base -- locate the base address of dynamic linker structs - -SYNOPSIS - - CORE_ADDR locate_base (void) - -DESCRIPTION - - For both the SunOS and SVR4 shared library implementations, if the - inferior executable has been linked dynamically, there is a single - address somewhere in the inferior's data space which is the key to - locating all of the dynamic linker's runtime structures. This - address is the value of the debug base symbol. The job of this - function is to find and return that address, or to return 0 if there - is no such address (the executable is statically linked for example). - - For SunOS, the job is almost trivial, since the dynamic linker and - all of it's structures are statically linked to the executable at - link time. Thus the symbol for the address we are looking for has - already been added to the minimal symbol table for the executable's - objfile at the time the symbol file's symbols were read, and all we - have to do is look it up there. Note that we explicitly do NOT want - to find the copies in the shared library. - - The SVR4 version is a bit more complicated because the address - is contained somewhere in the dynamic info section. We have to go - to a lot more work to discover the address of the debug base symbol. - Because of this complexity, we cache the value we find and return that - value on subsequent invocations. Note there is no copy in the - executable symbol tables. - - */ + 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 () +static 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, &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; - char **symbolp; - - /* For SunOS, we want to limit the search for the debug base symbol to the - executable being debugged, since there is a duplicate named symbol in the - shared library. We don't want the shared library versions. */ + i_link = &i->next; + i = *i_link; + } - for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) - { - msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); - if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) + /* 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) { - address = SYMBOL_VALUE_ADDRESS (msymbol); - return (address); + *i_link = i->next; + free_so (i); + gdb_link = &gdb->next; + gdb = *gdb_link; } - } - return (0); - -#else /* SVR4_SHARED_LIBS */ - - /* Check to see if we have a currently valid address, and if so, avoid - doing all this work again and just return the cached address. If - we have no cached address, try to locate it in the dynamic info - section for ELF executables. */ - - if (debug_base == 0) - { - if (exec_bfd != NULL - && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) - debug_base = elf_locate_base (); -#ifdef HANDLE_SVR4_EXEC_EMULATORS - /* Try it the hard way for emulated executables. */ - else if (inferior_pid != 0 && target_has_execution) - proc_iterate_over_mappings (look_for_base); -#endif - } - return (debug_base); -#endif /* !SVR4_SHARED_LIBS */ - -} - -/* - -LOCAL FUNCTION - - first_link_map_member -- locate first member in dynamic linker's map - -SYNOPSIS - - static 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. -*/ + /* If it's not on the inferior's list, remove it from GDB's tables. */ + else + { + *gdb_link = gdb->next; -static struct link_map * -first_link_map_member () -{ - struct link_map *lm = NULL; + /* Unless the user loaded it explicitly, free SO's objfile. */ + if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED)) + free_objfile (gdb->objfile); -#ifndef SVR4_SHARED_LIBS + /* Some targets' section tables might be referring to + sections from so->abfd; remove them. */ + remove_target_sections (gdb->abfd); - read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); - if (dynamic_copy.ld_version >= 2) - { - /* It is a version that we can deal with, so read in the secondary - structure and find the address of the link map list from it. */ - read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy, - sizeof (struct link_dynamic_2)); - lm = ld_2_copy.ld_loaded; + free_so (gdb); + gdb = *gdb_link; + } } -#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 - - find_solib -- step through list of shared objects - -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. + /* Now the inferior's list contains only shared objects that don't + appear in GDB's list --- those that are newly loaded. Add them + to GDB's shared object list. */ + if (inferior) + { + struct so_list *i; - The arg and return value are "struct link_map" pointers, as defined - in <link.h>. - */ + /* Add the new shared objects to GDB's list. */ + *gdb_link = inferior; -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) - { - /* 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 + 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) { - 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 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)) - { - 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); - } } - 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 */ - CORE_ADDR text_addr = 0; +/* GLOBAL FUNCTION - 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, - text_addr, - 0, 0, 0); - return (1); -} + solib_add -- read in symbol info for newly added shared libraries -/* 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 */ + SYNOPSIS -static int match_main (soname) - char *soname; -{ - char **mainp; + void solib_add (char *pattern, int from_tty, struct target_ops + *TARGET, int readsyms) - for (mainp = main_name_list; *mainp != NULL; mainp++) - { - if (strcmp (soname, *mainp) == 0) - return (1); - } + DESCRIPTION - return (0); -} + 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. -/* + If READSYMS is 0, defer reading symbolic information until later + but still do any needed low level processing. -GLOBAL FUNCTION + FROM_TTY and TARGET are as described for update_solib_list, above. */ - 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) +{ + struct so_list *gdb; -SYNOPSIS + if (pattern) + { + char *re_err = re_comp (pattern); - void solib_add (char *arg_string, int from_tty, - struct target_ops *target) + if (re_err) + error ("Invalid regexp: %s", re_err); + } -DESCRIPTION + 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; -void -solib_add (arg_string, from_tty, target) - char *arg_string; - int from_tty; - struct target_ops *target; -{ - register struct so_list *so = NULL; /* link map state variable */ - - /* Last shared library that we read. */ - struct so_list *so_last = NULL; - - char *re_err; - int count; - int old; - - if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) - { - error ("Invalid regexp: %s", re_err); - } - - /* 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) + for (gdb = so_list_head; gdb; gdb = gdb->next) + if (! pattern || re_exec (gdb->so_name)) { - 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 *) - xrealloc ((char *)target -> to_sections, - (sizeof (struct section_table)) * (count + old)); - } - else - { - old = 0; - target -> to_sections = (struct section_table *) - 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; - } + any_matches = 1; - /* Add these section table entries to the target's table. */ - while ((so = find_solib (so)) != NULL) + if (gdb->symbols_loaded) { - if (so -> so_name[0]) - { - count = so -> sections_end - so -> sections; - memcpy ((char *) (target -> to_sections + old), - so -> sections, - (sizeof (struct section_table)) * count); - old += count; - } + if (from_tty) + printf_unfiltered ("Symbols already loaded for %s\n", + gdb->so_name); } - } - } - - /* 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) + else if (readsyms) { - if (from_tty) + if (catch_errors + (symbol_add_stub, gdb, + "Error while reading shared library symbols:\n", + RETURN_MASK_ALL)) { - printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name); + if (from_tty) + printf_unfiltered ("Loaded symbols for %s\n", + gdb->so_name); + gdb->symbols_loaded = 1; + loaded_any_symbols = 1; } } - 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 (from_tty && pattern && ! any_matches) + printf_unfiltered + ("No loaded shared libraries match the pattern `%s'.\n", pattern); - if (so_last) - special_symbol_handling (so_last); + 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 */ + 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) + { + addr_width = 8 + 4; + addr_fmt = "08l"; + } + else if (TARGET_PTR_BIT == 64) + { + addr_width = 16 + 4; + addr_fmt = "016l"; + } + else { - printf_unfiltered ("No exec file.\n"); - return; + internal_error (__FILE__, __LINE__, + "TARGET_PTR_BIT returned unknown size %d", + TARGET_PTR_BIT); } - while ((so = find_solib (so)) != NULL) + + update_solib_list (from_tty, 0); + + for (so = so_list_head; so; so = so->next) { - if (so -> so_name[0]) + if (so->so_name[0]) { if (!header_done) { - printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", - "Shared Object Library"); + printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From", + addr_width, "To", "Syms Read", + "Shared Object Library"); header_done++; } - /* FIXME-32x64: need print_address_numeric with field width or - some such. */ - printf_unfiltered ("%-12s", - local_hex_string_custom ((unsigned long) LM_ADDR (so), - "08l")); - printf_unfiltered ("%-12s", - local_hex_string_custom ((unsigned long) so -> lmend, - "08l")); - printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); - printf_unfiltered ("%s\n", so -> so_name); + + printf_unfiltered ("%-*s", addr_width, + 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_unfiltered ("No shared libraries loaded at this time.\n"); + printf_unfiltered ("No shared libraries loaded at this time.\n"); } } /* -GLOBAL FUNCTION + GLOBAL FUNCTION - solib_address -- check to see if an address is in a shared lib + solib_address -- check to see if an address is in a shared lib -SYNOPSIS + SYNOPSIS - char * 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. */ char * -solib_address (address) - CORE_ADDR address; +solib_address (CORE_ADDR address) { - register struct so_list *so = 0; /* link map state variable */ - - while ((so = find_solib (so)) != NULL) + 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)) + 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 -> abfd) - { - 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; - 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. - -*/ - -#ifndef SVR4_SHARED_LIBS - -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)); + /* 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); -#else /* SVR4_SHARED_LIBS */ - - /* Note that breakpoint address and original contents are in our address - space, so we just need to write the original contents back. */ - - if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) - { - status = 0; - } - -#endif /* !SVR4_SHARED_LIBS */ - - /* For the SVR4 version, we always know the breakpoint address. For the - SunOS version we don't know it until the above code is executed. - Grumble if we are stopped anywhere besides the breakpoint address. */ - - if (stop_pc != breakpoint_addr) + 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 (); } -#endif /* #ifdef SVR4_SHARED_LIBS */ - -/* - -LOCAL FUNCTION - - enable_break -- arrange for dynamic linker to hit breakpoint - -SYNOPSIS - - int enable_break (void) - -DESCRIPTION - - Both the SunOS and the SVR4 dynamic linkers have, as part of their - debugger interface, support for arranging for the inferior to hit - a breakpoint after mapping in the shared libraries. This function - enables that breakpoint. - - For SunOS, there is a special flag location (in_debugger) which we - set to 1. When the dynamic linker sees this flag set, it will set - a breakpoint at a location known only to itself, after saving the - original contents of that place and the breakpoint address itself, - in it's own internal structures. When we resume the inferior, it - will eventually take a SIGTRAP when it runs into the breakpoint. - We handle this (in a different place) by restoring the contents of - the breakpointed location (which is only known after it stops), - chasing around to locate the shared libraries that have been - loaded, then resuming. - - For SVR4, the debugger interface structure contains a member (r_brk) - which is statically initialized at the time the shared library is - built, to the offset of a function (_r_debug_state) which is guaran- - teed to be called once before mapping in a library, and again when - the mapping is complete. At the time we are examining this member, - it contains only the unrelocated offset of the function, so we have - to do our own relocation. Later, when the dynamic linker actually - runs, it relocates r_brk to be the actual address of _r_debug_state(). - - The debugger interface structure also contains an enumeration which - is set to either RT_ADD or RT_DELETE prior to changing the mapping, - depending upon whether or not the library is being mapped or unmapped, - and then set to RT_CONSISTENT after the library is mapped/unmapped. -*/ - -static int -enable_break () +static void +do_clear_solib (void *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; - -#else /* SVR4_SHARED_LIBS */ - -#ifdef BKPT_AT_SYMBOL - - struct minimal_symbol *msymbol; - char **bkpt_namep; - asection *interp_sect; - - /* First, remove all the solib event breakpoints. Their addresses - may have changed since the last time we ran the program. */ - remove_solib_event_breakpoints (); - -#ifdef SVR4_SHARED_LIBS - /* Find the .interp section; if not found, warn the user and drop - into the old breakpoint at symbol code. */ - interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); - if (interp_sect) - { - unsigned int interp_sect_size; - char *buf; - CORE_ADDR load_addr; - bfd *tmp_bfd; - CORE_ADDR sym_addr = 0; - - /* Read the contents of the .interp section into a local buffer; - the contents specify the dynamic linker this program uses. */ - interp_sect_size = bfd_section_size (exec_bfd, interp_sect); - buf = alloca (interp_sect_size); - bfd_get_section_contents (exec_bfd, interp_sect, - buf, 0, interp_sect_size); - - /* Now we need to figure out where the dynamic linker was - loaded so that we can load its symbols and place a breakpoint - in the dynamic linker itself. - - This address is stored on the stack. However, I've been unable - to find any magic formula to find it for Solaris (appears to - be trivial on Linux). Therefore, we have to try an alternate - mechanism to find the dynamic linker's base address. */ - tmp_bfd = bfd_openr (buf, gnutarget); - if (tmp_bfd == NULL) - goto bkpt_at_symbol; - - /* Make sure the dynamic linker's really a useful object. */ - if (!bfd_check_format (tmp_bfd, bfd_object)) - { - warning ("Unable to grok dynamic linker %s as an object file", buf); - bfd_close (tmp_bfd); - goto bkpt_at_symbol; - } - - /* We find the dynamic linker's base address by examining the - current pc (which point at the entry point for the dynamic - linker) and subtracting the offset of the entry point. */ - load_addr = read_pc () - tmp_bfd->start_address; - - /* Now try to set a breakpoint in the dynamic linker. */ - for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) - { - sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); - if (sym_addr != 0) - break; - } - - /* We're done with the temporary bfd. */ - bfd_close (tmp_bfd); - - if (sym_addr != 0) - { - create_solib_event_breakpoint (load_addr + sym_addr); - return 1; - } + solib_cleanup_queued = 0; + clear_solib (); +} - /* 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 +/* GLOBAL FUNCTION - /* Scan through the list of symbols, trying to look up the symbol and - set a breakpoint there. Terminate loop when we/if we succeed. */ + solib_create_inferior_hook -- shared library startup support - 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; - } - } + SYNOPSIS - /* Nothing good happened. */ - success = 0; + void solib_create_inferior_hook() -#endif /* BKPT_AT_SYMBOL */ + DESCRIPTION -#endif /* !SVR4_SHARED_LIBS */ + 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. */ - 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() +void +solib_create_inferior_hook (void) { - /* 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 + TARGET_SO_SOLIB_CREATE_INFERIOR_HOOK (); +} - if (!enable_break ()) - { - warning ("shared library handler failed to enable breakpoint"); - return; - } +/* GLOBAL FUNCTION -#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. + in_solib_dynsym_resolve_code -- check to see if an address is in + dynamic loader's dynamic symbol + resolution code - 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. */ + SYNOPSIS - clear_proceed_status (); - stop_soon_quietly = 1; - stop_signal = TARGET_SIGNAL_0; - do - { - target_resume (-1, 0, stop_signal); - wait_for_inferior (); - } - while (stop_signal != TARGET_SIGNAL_TRAP); - stop_soon_quietly = 0; - - /* 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. */ + int in_solib_dynsym_resolve_code (CORE_ADDR pc) - if (DECR_PC_AFTER_BREAK) - { - stop_pc -= DECR_PC_AFTER_BREAK; - write_register (PC_REGNUM, stop_pc); - } + DESCRIPTION - if (!disable_break ()) - { - warning ("shared library handler failed to disable breakpoint"); - } + Determine if PC is in the dynamic linker's symbol resolution + code. Return 1 if so, 0 otherwise. +*/ - if (auto_solib_add) - solib_add ((char *) 0, 0, (struct target_ops *) 0); -#endif +int +in_solib_dynsym_resolve_code (CORE_ADDR pc) +{ + return TARGET_SO_IN_DYNSYM_RESOLVE_CODE (pc); } /* -LOCAL FUNCTION - - special_symbol_handling -- additional shared library symbol handling - -SYNOPSIS + LOCAL FUNCTION - void special_symbol_handling (struct so_list *so) + sharedlibrary_command -- handle command to explicitly add library -DESCRIPTION + SYNOPSIS - 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. + static void sharedlibrary_command (char *args, int from_tty) - 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. + DESCRIPTION -*/ + */ 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); - } - -#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) + 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. */ -DESCRIPTION - -*/ +void +no_shared_libraries (char *ignored, int from_tty) +{ + objfile_purge_solibs (); + do_clear_solib (NULL); +} static void -sharedlibrary_command (args, from_tty) -char *args; -int from_tty; +reload_shared_libraries (char *ignored, int from_tty) { - dont_repeat (); - solib_add (args, from_tty, (struct target_ops *) 0); + no_shared_libraries (NULL, from_tty); + solib_add (NULL, from_tty, NULL, auto_solib_add); } -#endif /* HAVE_LINK_H */ +extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */ void -_initialize_solib() +_initialize_solib (void) { -#ifdef HAVE_LINK_H + 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_zinteger, + (add_set_cmd ("auto-solib-add", class_support, var_boolean, (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'.", +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); - 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\ + 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), - &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\ + &setlist); + add_show_from_set (c, &showlist); + set_cmd_cfunc (c, reload_shared_libraries); + set_cmd_completer (c, filename_completer); + + /* Set the default value of "solib-absolute-prefix" from the sysroot, if + one is set. */ + solib_absolute_prefix = xstrdup (gdb_sysroot); + + 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), - &showlist); - -#endif /* HAVE_LINK_H */ + &setlist); + add_show_from_set (c, &showlist); + set_cmd_cfunc (c, reload_shared_libraries); + set_cmd_completer (c, filename_completer); } |