X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fsolib.c;h=c9f1e144cb39f37f195d19ea7f0e37a458176b71;hb=07cd4b9723e0a6d6bfec8980b0afcdbd9fdeb332;hp=6995e5009e29f8f5f59d51c59993ad01c2f3d906;hpb=06b6c733aedcaeaa7b54a7152e9d5e5dfdc6266f;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/solib.c b/gdb/solib.c index 6995e5009e..c9f1e144cb 100644 --- a/gdb/solib.c +++ b/gdb/solib.c @@ -1,461 +1,2131 @@ -/* Copyright (C) 1990 Free Software Foundation, Inc. +/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. + Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999 + Free Software Foundation, Inc. -This file is part of GDB. + This file is part of GDB. -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. + This program is 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. + 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + + +#include "defs.h" + +/* This file is only compilable if link.h is available. */ + +#ifdef HAVE_LINK_H -/* -** symbol definitions -*/ #include -#include -#include +#include +#include "gdb_string.h" #include #include -#include -#include "defs.h" -#include "param.h" + +#ifndef SVR4_SHARED_LIBS + /* SunOS shared libs need the nlist structure. */ +#include +#else +#include "elf/external.h" +#endif + +#include + #include "symtab.h" +#include "bfd.h" +#include "symfile.h" +#include "objfiles.h" #include "gdbcore.h" #include "command.h" #include "target.h" #include "frame.h" -#include "regex.h" +#include "gnu-regex.h" #include "inferior.h" +#include "environ.h" +#include "language.h" +#include "gdbcmd.h" -extern char *getenv(); +#define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */ -/* -** local data declarations -*/ -#define MAX_PATH_SIZE 256 -struct so_list { - struct link_map inferior_lm; /* inferior link map */ - struct link_map *inferior_lm_add; - long ld_text; - char inferior_so_name[MAX_PATH_SIZE]; /* Shared Object Library Name */ - struct so_list *next; /* Next Structure */ - char symbols_loaded; /* Flag: loaded? */ - char from_tty; /* Flag: print msgs? */ - bfd *so_bfd; +/* On SVR4 systems, a list of symbols in the dynamic linker where + GDB can try to place a breakpoint to monitor shared library + events. + + If none of these symbols are found, or other errors occur, then + SVR4 systems will fall back to using a symbol as the "startup + mapping complete" breakpoint address. */ + +#ifdef SVR4_SHARED_LIBS +static char *solib_break_names[] = +{ + "r_debug_state", + "_r_debug_state", + "_dl_debug_state", + "rtld_db_dlactivity", + NULL +}; +#endif + +#define BKPT_AT_SYMBOL 1 + +#if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) +static char *bkpt_names[] = +{ +#ifdef SOLIB_BKPT_NAME + SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ +#endif + "_start", + "main", + NULL +}; +#endif + +/* Symbols which are used to locate the base of the link map structures. */ + +#ifndef SVR4_SHARED_LIBS +static char *debug_base_symbols[] = +{ + "_DYNAMIC", + "_DYNAMIC__MGC", + NULL +}; +#endif + +static char *main_name_list[] = +{ + "main_$main", + NULL +}; + +/* local data declarations */ + +/* Macro to extract an address from a solib structure. + When GDB is configured for some 32-bit targets (e.g. Solaris 2.7 + sparc), BFD is configured to handle 64-bit targets, so CORE_ADDR is + 64 bits. We have to extract only the significant bits of addresses + to get the right address when accessing the core file BFD. */ + +#define SOLIB_EXTRACT_ADDRESS(member) \ + extract_address (&member, sizeof (member)) + +#ifndef SVR4_SHARED_LIBS + +#define LM_ADDR(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_addr)) +#define LM_NEXT(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_next)) +#define LM_NAME(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_name)) +/* Test for first link map entry; first entry is a shared library. */ +#define IGNORE_FIRST_LINK_MAP_ENTRY(so) (0) +static struct link_dynamic dynamic_copy; +static struct link_dynamic_2 ld_2_copy; +static struct ld_debug debug_copy; +static CORE_ADDR debug_addr; +static CORE_ADDR flag_addr; + +#else /* SVR4_SHARED_LIBS */ + +#define LM_ADDR(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_addr)) +#define LM_NEXT(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_next)) +#define LM_NAME(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_name)) +/* Test for first link map entry; first entry is the exec-file. */ +#define IGNORE_FIRST_LINK_MAP_ENTRY(so) \ + (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_prev) == 0) +static struct r_debug debug_copy; +char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ + +#endif /* !SVR4_SHARED_LIBS */ + +struct so_list + { + /* The following fields of the structure come directly from the + dynamic linker's tables in the inferior, and are initialized by + current_sos. */ + + struct so_list *next; /* next structure in linked list */ + struct link_map lm; /* copy of link map from inferior */ + CORE_ADDR lmaddr; /* addr in inferior lm was read from */ + + /* Shared object file name, exactly as it appears in the + inferior's link map. This may be a relative path, or something + which needs to be looked up in LD_LIBRARY_PATH, etc. We use it + to tell which entries in the inferior's dynamic linker's link + map we've already loaded. */ + char so_original_name[MAX_PATH_SIZE]; + + /* shared object file name, expanded to something GDB can open */ + char so_name[MAX_PATH_SIZE]; + + /* The following fields of the structure are built from + information gathered from the shared object file itself, and + are initialized when we actually add it to our symbol tables. */ + + bfd *abfd; + CORE_ADDR lmend; /* upper addr bound of mapped object */ + char symbols_loaded; /* flag: symbols read in yet? */ + char from_tty; /* flag: print msgs? */ + struct objfile *objfile; /* objfile for loaded lib */ struct section_table *sections; struct section_table *sections_end; -}; + struct section_table *textsection; + }; -static struct so_list *so_list_head = 0; +static struct so_list *so_list_head; /* List of known shared objects */ +static CORE_ADDR debug_base; /* Base of dynamic linker structures */ +static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ + +static int solib_cleanup_queued = 0; /* make_run_cleanup called */ + +extern int +fdmatch PARAMS ((int, int)); /* In libiberty */ + +/* Local function prototypes */ + +static void +do_clear_solib PARAMS ((PTR)); + +static int +match_main PARAMS ((char *)); + +static void +special_symbol_handling PARAMS ((void)); + +static void +sharedlibrary_command PARAMS ((char *, int)); + +static int +enable_break PARAMS ((void)); + +static void +info_sharedlibrary_command PARAMS ((char *, int)); + +static int symbol_add_stub PARAMS ((PTR)); + +static CORE_ADDR + first_link_map_member PARAMS ((void)); + +static CORE_ADDR + locate_base PARAMS ((void)); + +static int solib_map_sections PARAMS ((PTR)); + +#ifdef SVR4_SHARED_LIBS + +static CORE_ADDR + elf_locate_base PARAMS ((void)); + +#else + +static struct so_list *current_sos (void); +static void free_so (struct so_list *node); + +static int +disable_break PARAMS ((void)); + +static void +allocate_rt_common_objfile PARAMS ((void)); -/* -** Build a section map for a shared library, record its text size in -** the so_list structure and set up the text section of the shared lib. -*/ static void -solib_map_sections(so) -struct so_list *so; +solib_add_common_symbols (CORE_ADDR); + +#endif + +void _initialize_solib PARAMS ((void)); + +/* If non-zero, this is a prefix that will be added to the front of the name + shared libraries with an absolute filename for loading. */ +static char *solib_absolute_prefix = NULL; + +/* If non-empty, this is a search path for loading non-absolute shared library + symbol files. This takes precedence over the environment variables PATH + and LD_LIBRARY_PATH. */ +static char *solib_search_path = NULL; + +/* + + LOCAL FUNCTION + + solib_map_sections -- open bfd and build sections for shared lib + + SYNOPSIS + + static int solib_map_sections (struct so_list *so) + + DESCRIPTION + + Given a pointer to one of the shared objects in our list + of mapped objects, use the recorded name to open a bfd + descriptor for the object, build a section table, and then + relocate all the section addresses by the base address at + which the shared object was mapped. + + FIXMES + + In most (all?) cases the shared object file name recorded in the + dynamic linkage tables will be a fully qualified pathname. For + cases where it isn't, do we really mimic the systems search + mechanism correctly in the below code (particularly the tilde + expansion stuff?). + */ + +static int +solib_map_sections (arg) + PTR arg; { + struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ char *filename; char *scratch_pathname; int scratch_chan; struct section_table *p; - - filename = tilde_expand (so->inferior_so_name); - make_cleanup (free, filename); - - scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, - &scratch_pathname); + struct cleanup *old_chain; + bfd *abfd; + + filename = tilde_expand (so->so_name); + + if (solib_absolute_prefix && ROOTED_P (filename)) + /* Prefix shared libraries with absolute filenames with + SOLIB_ABSOLUTE_PREFIX. */ + { + char *pfxed_fn; + int pfx_len; + + pfx_len = strlen (solib_absolute_prefix); + + /* Remove trailing slashes. */ + while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1])) + pfx_len--; + + pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1); + strcpy (pfxed_fn, solib_absolute_prefix); + strcat (pfxed_fn, filename); + free (filename); + + filename = pfxed_fn; + } + + old_chain = make_cleanup (free, filename); + + scratch_chan = -1; + + if (solib_search_path) + scratch_chan = openp (solib_search_path, + 1, filename, O_RDONLY, 0, &scratch_pathname); if (scratch_chan < 0) - scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, O_RDONLY, 0, - &scratch_pathname); + scratch_chan = openp (get_in_environ (inferior_environ, "PATH"), + 1, filename, O_RDONLY, 0, &scratch_pathname); if (scratch_chan < 0) - perror_with_name (filename); - - so->so_bfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan); - if (!so->so_bfd) - error ("Could not open `%s' as an executable file: %s", - scratch_pathname, bfd_errmsg (bfd_error)); - if (!bfd_check_format (so->so_bfd, bfd_object)) - error ("\"%s\": not in executable format: %s.", - scratch_pathname, bfd_errmsg (bfd_error)); - if (build_section_table (so->so_bfd, &so->sections, &so->sections_end)) - error ("Can't find the file sections in `%s': %s", - exec_bfd->filename, bfd_errmsg (bfd_error)); + { + scratch_chan = openp (get_in_environ + (inferior_environ, "LD_LIBRARY_PATH"), + 1, filename, O_RDONLY, 0, &scratch_pathname); + } + if (scratch_chan < 0) + { + perror_with_name (filename); + } + /* Leave scratch_pathname allocated. abfd->name will point to it. */ + + abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); + if (!abfd) + { + close (scratch_chan); + error ("Could not open `%s' as an executable file: %s", + scratch_pathname, bfd_errmsg (bfd_get_error ())); + } + /* Leave bfd open, core_xfer_memory and "info files" need it. */ + so->abfd = abfd; + abfd->cacheable = true; + + /* copy full path name into so_name, so that later symbol_file_add can find + it */ + if (strlen (scratch_pathname) >= MAX_PATH_SIZE) + error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure."); + strcpy (so->so_name, scratch_pathname); + + if (!bfd_check_format (abfd, bfd_object)) + { + error ("\"%s\": not in executable format: %s.", + scratch_pathname, bfd_errmsg (bfd_get_error ())); + } + if (build_section_table (abfd, &so->sections, &so->sections_end)) + { + error ("Can't find the file sections in `%s': %s", + bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); + } for (p = so->sections; p < so->sections_end; p++) { - if (strcmp (bfd_section_name (so->so_bfd, p->sec_ptr), ".text") == 0) + /* Relocate the section binding addresses as recorded in the shared + object's file by the base address to which the object was actually + mapped. */ + p->addr += LM_ADDR (so); + p->endaddr += LM_ADDR (so); + so->lmend = max (p->endaddr, so->lmend); + if (STREQ (p->the_bfd_section->name, ".text")) { - /* Determine length of text section and relocate it. */ - so->ld_text = p->endaddr - p->addr; - p->addr += (CORE_ADDR)so->inferior_lm.lm_addr; - p->endaddr += (CORE_ADDR)so->inferior_lm.lm_addr; + so->textsection = p; } - else - /* All other sections are ignored for now. */ - p->addr = p->endaddr = 0; } + + /* Free the file names, close the file now. */ + do_cleanups (old_chain); + + return (1); } -/*=======================================================================*/ - -/* find_solib -** -**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 . -** -** NOTE: This only works under SunOS4.0. -*/ - -struct so_list *find_solib(so_list_ptr) -struct so_list *so_list_ptr; /* so_list_head position ptr */ +#ifndef SVR4_SHARED_LIBS + +/* Allocate the runtime common object file. */ + +static void +allocate_rt_common_objfile () { -struct so_list *so_list_next = 0; -struct link_map *inferior_lm = 0; -struct link_dynamic inferior_dynamic_cpy; -struct link_dynamic_2 inferior_ld_2_cpy; -struct so_list *new; -int i; - - if (!so_list_ptr) { - if (!(so_list_next = so_list_head)) { - i = lookup_misc_func ("_DYNAMIC"); - if (i >= 0) { - read_memory(misc_function_vector[i].address, - &inferior_dynamic_cpy, - sizeof(struct link_dynamic)); - if (inferior_dynamic_cpy.ld_version == 3) { - read_memory((CORE_ADDR)inferior_dynamic_cpy.ld_un.ld_2, - &inferior_ld_2_cpy, - sizeof(struct link_dynamic_2)); - inferior_lm = inferior_ld_2_cpy.ld_loaded; - } - } - } - } else { - /* - ** Advance to next local abbreviated load_map structure - */ - if (!(inferior_lm = so_list_ptr->inferior_lm.lm_next)) { - /* See if any were added, but be quiet if we can't read - from the target any more. */ - int status; - - status = target_read_memory ( - (CORE_ADDR)so_list_ptr->inferior_lm_add, - (char *)&so_list_ptr->inferior_lm, - sizeof(struct link_map)); - if (status == 0) - inferior_lm = so_list_ptr->inferior_lm.lm_next; - else - inferior_lm = 0; - } - so_list_next = so_list_ptr->next; - } - if ((!so_list_next) && inferior_lm) { - /* - ** Get Next LM Structure from inferior image and build - ** an local abbreviated load_map structure - */ - new = (struct so_list *) xmalloc(sizeof(struct so_list)); - new->inferior_lm_add = inferior_lm; - read_memory((CORE_ADDR)inferior_lm, - &new->inferior_lm, - sizeof(struct link_map)); - - read_memory((CORE_ADDR)new->inferior_lm.lm_name, - new->inferior_so_name, - MAX_PATH_SIZE - 1); - new->inferior_so_name[MAX_PATH_SIZE - 1] = 0; - /* Zero everything after the first terminating null */ - strncpy(new->inferior_so_name, new->inferior_so_name, MAX_PATH_SIZE); - -#if 0 - /* This doesn't work for core files, so instead get ld_text - using solib_map_sections (below). */ - read_memory((CORE_ADDR)new->inferior_lm.lm_ld, - &inferior_dynamic_cpy, - sizeof(struct link_dynamic)); - read_memory((CORE_ADDR)inferior_dynamic_cpy.ld_un.ld_2, - &inferior_ld_2_cpy, - sizeof(struct link_dynamic_2)); - new->ld_text = inferior_ld_2_cpy.ld_text; -#endif + 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"); - new->next = 0; - new->symbols_loaded = 0; - new->so_bfd = NULL; - new->sections = NULL; - if (so_list_ptr) - so_list_ptr->next = new; - else - so_list_head = new; + /* Add this file onto the tail of the linked list of other such files. */ - solib_map_sections (new); + 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; + } - so_list_next = new; - } - return(so_list_next); + rt_common_objfile = objfile; } -/* A small stub to get us past the arg-passing pinhole of catch_errors. */ +/* Read all dynamically loaded common symbol definitions from the inferior + and put them into the minimal symbol table for the runtime common + objfile. */ -static int -symbol_add_stub (arg) - char *arg; +static void +solib_add_common_symbols (rtc_symp) + CORE_ADDR rtc_symp; { - register struct so_list *so = (struct so_list *)arg; /* catch_errs bogon */ + struct rtc_symb inferior_rtc_symb; + struct nlist inferior_rtc_nlist; + int len; + char *name; - symbol_file_add (so->inferior_so_name, so->from_tty, - (unsigned int)so->inferior_lm.lm_addr, 0); - return 1; -} + /* 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; + } -/* The real work of adding a shared library file to the symtab and - the section list. */ + init_minimal_symbol_collection (); + make_cleanup ((make_cleanup_func) discard_minimal_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 = 0; /* link map state variable */ - char *val; - int count, old; - struct section_table *sec; - - if (arg_string == 0) - re_comp ("."); - else if (val = (char *) re_comp (arg_string)) { - error ("Invalid regexp: %s", val); - } + while (rtc_symp) + { + read_memory (rtc_symp, + (char *) &inferior_rtc_symb, + sizeof (inferior_rtc_symb)); + read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp), + (char *) &inferior_rtc_nlist, + sizeof (inferior_rtc_nlist)); + if (inferior_rtc_nlist.n_type == N_COMM) + { + /* FIXME: The length of the symbol name is not available, but in the + current implementation the common symbol is allocated immediately + behind the name of the symbol. */ + len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; - /* Getting new symbols may change our opinion about what is - frameless. */ - reinit_frame_cache (); + name = xmalloc (len); + read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name), + name, len); - if (from_tty) { - printf_filtered ("Shared libraries"); - if (arg_string) - printf_filtered (" matching regular expresion \"%s\"", arg_string); - printf_filtered (":\n"); - } - - dont_repeat(); - - while (so = find_solib(so)) { - if (re_exec(so->inferior_so_name)) { - if (so->symbols_loaded) { - if (from_tty) - printf("Symbols already loaded for %s\n", so->inferior_so_name); - } else { - so->symbols_loaded = 1; - so->from_tty = from_tty; - catch_errors (symbol_add_stub, (char *)so, - "Error while reading shared library symbols:\n"); - } - } - } + /* Allocate the runtime common objfile if necessary. */ + if (rt_common_objfile == NULL) + allocate_rt_common_objfile (); - /* 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 = 0; - count = 0; - while (0 != (so = find_solib (so))) { - count += so->sections_end - so->sections; - } - - if (count) { - /* Reallocate the target's section table including the new size. */ - if (target->sections) { - old = target->sections_end - target->sections; - target->sections = (struct section_table *) - realloc ((char *)target->sections, - (sizeof (struct section_table)) * (count + old)); - } else { - old = 0; - target->sections = (struct section_table *) - malloc ((sizeof (struct section_table)) * count); - } - target->sections_end = target->sections + (count + old); - - /* Add these section table entries to the target's table. */ - while (0 != (so = find_solib (so))) { - count = so->sections_end - so->sections; - bcopy (so->sections, (char *)(target->sections + old), - (sizeof (struct section_table)) * count); - old += count; - } + prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, + mst_bss, rt_common_objfile); + free (name); + } + rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next); } - } + + /* Install any minimal symbols that have been collected as the current + minimal symbols for the runtime common objfile. */ + + install_minimal_symbols (rt_common_objfile); } -/*=======================================================================*/ +#endif /* SVR4_SHARED_LIBS */ + + +#ifdef SVR4_SHARED_LIBS + +static CORE_ADDR + bfd_lookup_symbol PARAMS ((bfd *, char *)); + +/* + + LOCAL FUNCTION + + bfd_lookup_symbol -- lookup the value for a specific symbol + + SYNOPSIS + + CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) + + DESCRIPTION + + An expensive way to lookup the value of a single symbol for + bfd's that are only temporary anyway. This is used by the + shared library support to find the address of the debugger + interface structures in the shared library. + + Note that 0 is specifically allowed as an error return (no + such symbol). + */ -static void solib_info() +static CORE_ADDR +bfd_lookup_symbol (abfd, symname) + bfd *abfd; + char *symname; { -register struct so_list *so = 0; /* link map state variable */ + 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; - while (so = find_solib(so)) { - if (so == so_list_head) { - printf(" Address Range Syms Read Shared Object Library\n"); + storage_needed = bfd_get_symtab_upper_bound (abfd); + + if (storage_needed > 0) + { + symbol_table = (asymbol **) xmalloc (storage_needed); + back_to = make_cleanup (free, (PTR) symbol_table); + number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); + + for (i = 0; i < number_of_symbols; i++) + { + sym = *symbol_table++; + if (STREQ (sym->name, symname)) + { + /* Bfd symbols are section relative. */ + symaddr = sym->value + sym->section->vma; + break; + } } - printf(" 0x%08x - 0x%08x %s %s\n", - so->inferior_lm.lm_addr, - so->inferior_lm.lm_addr + so->ld_text - 1, - (so->symbols_loaded ? "Yes" : "No "), - so->inferior_so_name); - } - if (!so_list_head) { - printf("No shared libraries loaded at this time.\n"); + do_cleanups (back_to); } + return (symaddr); } +#ifdef HANDLE_SVR4_EXEC_EMULATORS + /* -** Called by Insert Breakpoint to see if Address is Shared Library Address -*/ -int -solib_address(address) - CORE_ADDR address; + 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[] = { -register struct so_list *so = 0; /* link map state variable */ + "r_debug", /* Solaris 2.3 */ + "_r_debug", /* Solaris 2.1, 2.2 */ + NULL +}; - while (so = find_solib(so)) { - if ((address >= (CORE_ADDR) so->inferior_lm.lm_addr) && - (address < (CORE_ADDR) so->inferior_lm.lm_addr + so->ld_text)) - return 1; - } - return 0; -} +static int +look_for_base PARAMS ((int, CORE_ADDR)); /* -** Called by free_all_symtabs -*/ -void -clear_solib() -{ -struct so_list *next; - - while (so_list_head) { - if (so_list_head->sections) - free (so_list_head->sections); - if (so_list_head->so_bfd) - bfd_close (so_list_head->so_bfd); - next = so_list_head->next; - free(so_list_head); - so_list_head = next; - } -} -/* Called by child_create_inferior when the inferior is stopped at its - first instruction. */ + LOCAL FUNCTION + + look_for_base -- examine file for each mapped address segment + + SYNOPSYS + + static int look_for_base (int fd, CORE_ADDR baseaddr) + + DESCRIPTION + + This function is passed to proc_iterate_over_mappings, which + causes it to get called once for each mapped address space, with + an open file descriptor for the file mapped to that space, and the + base address of that mapped space. -void -solib_create_inferior_hook() + Our job is to find the debug base symbol in the file that this + fd is open on, if it exists, and if so, initialize the dynamic + linker structure base address debug_base. + + Note that this is a computationally expensive proposition, since + we basically have to open a bfd on every call, so we specifically + avoid opening the exec file. + */ + +static int +look_for_base (fd, baseaddr) + int fd; + CORE_ADDR baseaddr; { - struct link_dynamic inferior_dynamic_cpy; - CORE_ADDR inferior_debug_addr; - struct ld_debug inferior_debug_cpy; - int in_debugger; - CORE_ADDR in_debugger_addr; - CORE_ADDR breakpoint_addr; - int i, j; - - /* FIXME: We should look around in the executable code to find _DYNAMIC, - if it isn't in the symbol table. It's not that hard to find... - Then we can debug stripped executables using shared library symbols. */ - i = lookup_misc_func ("_DYNAMIC"); - if (i < 0) /* Can't find shared lib ptr. */ - return; - if (misc_function_vector[i].address == 0) /* statically linked program */ - return; + bfd *interp_bfd; + CORE_ADDR address = 0; + char **symbolp; - /* Get link_dynamic structure */ - j = target_read_memory(misc_function_vector[i].address, - &inferior_dynamic_cpy, - sizeof(struct link_dynamic)); - if (j) /* unreadable */ - return; + /* 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. */ - /* Calc address of debugger interface structure */ - inferior_debug_addr = (CORE_ADDR)inferior_dynamic_cpy.ldd; - /* Calc address of `in_debugger' member of debugger interface structure */ - in_debugger_addr = inferior_debug_addr + (CORE_ADDR)((char *)&inferior_debug_cpy.ldd_in_debugger - (char *)&inferior_debug_cpy); - /* Write a value of 1 to this member. */ - in_debugger = 1; - write_memory(in_debugger_addr, &in_debugger, sizeof(in_debugger)); + if (fd == -1 + || (exec_bfd != NULL + && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd))) + { + return (0); + } - /* Now run the target. Seeing `in_debugger' set, it will set a - breakpoint at some convenient place, remember the original contents - of that place, and eventually take a SIGTRAP when it runs into the - breakpoint. We handle this 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. */ + /* 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. */ - clear_proceed_status (); - stop_soon_quietly = 1; - target_resume (0, 0); - wait_for_inferior (); - while (stop_signal != SIGTRAP) + if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) { - /* FIXME, what if child has exit()ed? Must exit loop somehow */ - target_resume (0, stop_signal); - wait_for_inferior (); + return (0); } - stop_soon_quietly = 0; + if (!bfd_check_format (interp_bfd, bfd_object)) + { + /* FIXME-leak: on failure, might not free all memory associated with + interp_bfd. */ + bfd_close (interp_bfd); + return (0); + } + + /* Now try to find our debug base symbol in this file, which we at + least know to be a valid ELF executable or shared library. */ + + for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) + { + address = bfd_lookup_symbol (interp_bfd, *symbolp); + if (address != 0) + { + break; + } + } + if (address == 0) + { + /* FIXME-leak: on failure, might not free all memory associated with + interp_bfd. */ + bfd_close (interp_bfd); + return (0); + } + + /* Eureka! We found the symbol. But now we may need to relocate it + by the base address. If the symbol's value is less than the base + address of the shared library, then it hasn't yet been relocated + by the dynamic linker, and we have to do it ourself. FIXME: Note + that we make the assumption that the first segment that corresponds + to the shared library has the base address to which the library + was relocated. */ - /* Set `in_debugger' to zero now. WHY, is this needed? */ - in_debugger = 0; - write_memory(in_debugger_addr, &in_debugger, sizeof(in_debugger)); - read_memory(inferior_debug_addr, &inferior_debug_cpy, sizeof(inferior_debug_cpy)); - /* FIXME: maybe we should add the common symbols from the ldd_cp chain - * to the misc_function_vector ? - */ - breakpoint_addr = (CORE_ADDR)inferior_debug_cpy.ldd_bp_addr; - if (stop_pc - DECR_PC_AFTER_BREAK == breakpoint_addr) - { - write_memory(breakpoint_addr, &inferior_debug_cpy.ldd_bp_inst, sizeof(inferior_debug_cpy.ldd_bp_inst)); - if (DECR_PC_AFTER_BREAK) - { - stop_pc -= DECR_PC_AFTER_BREAK; - write_register (PC_REGNUM, stop_pc); - } - } - solib_add ((char *)0, 0, (struct target_ops *)0); + 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 */ -void -sharedlibrary_command (args, from_tty) +/* + + LOCAL FUNCTION + + elf_locate_base -- locate the base address of dynamic linker structs + for SVR4 elf targets. + + SYNOPSIS + + CORE_ADDR elf_locate_base (void) + + DESCRIPTION + + For SVR4 elf targets the address of the dynamic linker's runtime + structure is contained within the dynamic info section in the + executable file. The dynamic section is also mapped into the + inferior address space. Because the runtime loader fills in the + real address before starting the inferior, we have to read in the + dynamic info section from the inferior address space. + If there are any errors while trying to find the address, we + silently return 0, otherwise the found address is returned. + + */ + +static CORE_ADDR +elf_locate_base () { - solib_add (args, from_tty, (struct target_ops *)0); + sec_ptr dyninfo_sect; + int dyninfo_sect_size; + CORE_ADDR dyninfo_addr; + char *buf; + char *bufend; + + /* Find the start address of the .dynamic section. */ + dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); + if (dyninfo_sect == NULL) + return 0; + dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); + + /* Read in .dynamic section, silently ignore errors. */ + dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); + buf = alloca (dyninfo_sect_size); + if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) + return 0; + + /* Find the DT_DEBUG entry in the the .dynamic section. + For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has + no DT_DEBUG entries. */ +#ifndef TARGET_ELF64 + for (bufend = buf + dyninfo_sect_size; + buf < bufend; + buf += sizeof (Elf32_External_Dyn)) + { + Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; + long dyn_tag; + CORE_ADDR dyn_ptr; + + dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); + if (dyn_tag == DT_NULL) + break; + else if (dyn_tag == DT_DEBUG) + { + dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); + return dyn_ptr; + } +#ifdef DT_MIPS_RLD_MAP + else if (dyn_tag == DT_MIPS_RLD_MAP) + { + char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; + + /* DT_MIPS_RLD_MAP contains a pointer to the address + of the dynamic link structure. */ + dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); + if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) + return 0; + return extract_unsigned_integer (pbuf, sizeof (pbuf)); + } +#endif + } +#else /* ELF64 */ + for (bufend = buf + dyninfo_sect_size; + buf < bufend; + buf += sizeof (Elf64_External_Dyn)) + { + Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; + long dyn_tag; + CORE_ADDR dyn_ptr; + + dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); + if (dyn_tag == DT_NULL) + break; + else if (dyn_tag == DT_DEBUG) + { + dyn_ptr = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); + return dyn_ptr; + } + } +#endif + + /* DT_DEBUG entry not found. */ + return 0; } -void -_initialize_solib() -{ +#endif /* SVR4_SHARED_LIBS */ - add_com("sharedlibrary", class_files, sharedlibrary_command, - "Load shared object library symbols for files matching REGEXP."); - add_info("sharedlibrary", solib_info, - "Status of loaded shared object libraries"); +/* + + LOCAL FUNCTION + + locate_base -- locate the base address of dynamic linker structs + + SYNOPSIS + + CORE_ADDR locate_base (void) + + DESCRIPTION + + For both the SunOS and SVR4 shared library implementations, if the + inferior executable has been linked dynamically, there is a single + address somewhere in the inferior's data space which is the key to + locating all of the dynamic linker's runtime structures. This + address is the value of the debug base symbol. The job of this + function is to find and return that address, or to return 0 if there + is no such address (the executable is statically linked for example). + + For SunOS, the job is almost trivial, since the dynamic linker and + all of it's structures are statically linked to the executable at + link time. Thus the symbol for the address we are looking for has + already been added to the minimal symbol table for the executable's + objfile at the time the symbol file's symbols were read, and all we + have to do is look it up there. Note that we explicitly do NOT want + to find the copies in the shared library. + + The SVR4 version is a bit more complicated because the address + is contained somewhere in the dynamic info section. We have to go + to a lot more work to discover the address of the debug base symbol. + Because of this complexity, we cache the value we find and return that + value on subsequent invocations. Note there is no copy in the + executable symbol tables. + + */ + +static CORE_ADDR +locate_base () +{ + +#ifndef SVR4_SHARED_LIBS + + struct minimal_symbol *msymbol; + CORE_ADDR address = 0; + char **symbolp; + + /* For SunOS, we want to limit the search for the debug base symbol to the + executable being debugged, since there is a duplicate named symbol in the + shared library. We don't want the shared library versions. */ + + for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) + { + msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); + if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) + { + address = SYMBOL_VALUE_ADDRESS (msymbol); + return (address); + } + } + return (0); + +#else /* SVR4_SHARED_LIBS */ + + /* Check to see if we have a currently valid address, and if so, avoid + doing all this work again and just return the cached address. If + we have no cached address, try to locate it in the dynamic info + section for ELF executables. */ + + if (debug_base == 0) + { + if (exec_bfd != NULL + && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) + debug_base = elf_locate_base (); +#ifdef HANDLE_SVR4_EXEC_EMULATORS + /* Try it the hard way for emulated executables. */ + else if (inferior_pid != 0 && target_has_execution) + proc_iterate_over_mappings (look_for_base); +#endif + } + return (debug_base); + +#endif /* !SVR4_SHARED_LIBS */ + +} + +/* + + LOCAL FUNCTION + + first_link_map_member -- locate first member in dynamic linker's map + + SYNOPSIS + + static CORE_ADDR first_link_map_member (void) + + DESCRIPTION + + Find the first element in the inferior's dynamic link map, and + return its address in the inferior. This function doesn't copy the + link map entry itself into our address space; current_sos actually + does the reading. */ + +static CORE_ADDR +first_link_map_member () +{ + CORE_ADDR lm = 0; + +#ifndef SVR4_SHARED_LIBS + + read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); + if (dynamic_copy.ld_version >= 2) + { + /* It is a version that we can deal with, so read in the secondary + structure and find the address of the link map list from it. */ + read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2), + (char *) &ld_2_copy, sizeof (struct link_dynamic_2)); + lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded); + } + +#else /* SVR4_SHARED_LIBS */ + + read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); + /* FIXME: Perhaps we should validate the info somehow, perhaps by + checking r_version for a known version number, or r_state for + RT_CONSISTENT. */ + lm = SOLIB_EXTRACT_ADDRESS (debug_copy.r_map); + +#endif /* !SVR4_SHARED_LIBS */ + + return (lm); +} + +#ifdef SVR4_SHARED_LIBS +/* + + LOCAL FUNCTION + + open_exec_file_object + + SYNOPSIS + + void open_symbol_file_object (int from_tty) + + DESCRIPTION + + If no open symbol file, attempt to locate and open the main symbol + file. On SVR4 systems, this is the first link map entry. If its + name is here, we can open it. Useful when attaching to a process + without first loading its symbol file. + + */ + +int +open_symbol_file_object (arg) + PTR arg; +{ + int from_tty = (int) arg; /* sneak past catch_errors */ + CORE_ADDR lm; + struct link_map lmcopy; + char *filename; + int errcode; + + if (symfile_objfile) + if (!query ("Attempt to reload symbols from process? ")) + return 0; + + if ((debug_base = locate_base ()) == 0) + return 0; /* failed somehow... */ + + /* First link map member should be the executable. */ + if ((lm = first_link_map_member ()) == 0) + return 0; /* failed somehow... */ + + /* Read from target memory to GDB. */ + read_memory (lm, (void *) &lmcopy, sizeof (lmcopy)); + + if (lmcopy.l_name == 0) + return 0; /* no filename. */ + + /* Now fetch the filename from target memory. */ + target_read_string (SOLIB_EXTRACT_ADDRESS (lmcopy.l_name), &filename, + MAX_PATH_SIZE - 1, &errcode); + if (errcode) + { + warning ("failed to read exec filename from attached file: %s", + safe_strerror (errcode)); + return 0; + } + + make_cleanup ((make_cleanup_func) free, (void *) filename); + /* Have a pathname: read the symbol file. */ + symbol_file_command (filename, from_tty); + + return 1; +} +#endif /* SVR4_SHARED_LIBS */ + + +/* LOCAL FUNCTION + + free_so --- free a `struct so_list' object + + SYNOPSIS + + void free_so (struct so_list *so) + + DESCRIPTION + + Free the storage associated with the `struct so_list' object SO. + If we have opened a BFD for SO, close it. + + The caller is responsible for removing SO from whatever list it is + a member of. If we have placed SO's sections in some target's + section table, the caller is responsible for removing them. + + This function doesn't mess with objfiles at all. If there is an + objfile associated with SO that needs to be removed, the caller is + responsible for taking care of that. */ + +static void +free_so (struct so_list *so) +{ + char *bfd_filename = 0; + + if (so->sections) + free (so->sections); + + if (so->abfd) + { + bfd_filename = bfd_get_filename (so->abfd); + if (! bfd_close (so->abfd)) + warning ("cannot close \"%s\": %s", + bfd_filename, bfd_errmsg (bfd_get_error ())); + } + + if (bfd_filename) + free (bfd_filename); + + free (so); +} + + +/* On some systems, the only way to recognize the link map entry for + the main executable file is by looking at its name. Return + non-zero iff SONAME matches one of the known main executable names. */ + +static int +match_main (soname) + char *soname; +{ + char **mainp; + + for (mainp = main_name_list; *mainp != NULL; mainp++) + { + if (strcmp (soname, *mainp) == 0) + return (1); + } + + return (0); +} + + +/* LOCAL FUNCTION + + current_sos -- build a list of currently loaded shared objects + + SYNOPSIS + + struct so_list *current_sos () + + DESCRIPTION + + Build a list of `struct so_list' objects describing the shared + objects currently loaded in the inferior. This list does not + include an entry for the main executable file. + + Note that we only gather information directly available from the + inferior --- we don't examine any of the shared library files + themselves. The declaration of `struct so_list' says which fields + we provide values for. */ + +static struct so_list * +current_sos () +{ + CORE_ADDR lm; + struct so_list *head = 0; + struct so_list **link_ptr = &head; + + /* Make sure we've looked up the inferior's dynamic linker's base + structure. */ + if (! debug_base) + { + debug_base = locate_base (); + + /* If we can't find the dynamic linker's base structure, this + must not be a dynamically linked executable. Hmm. */ + if (! debug_base) + return 0; + } + + /* Walk the inferior's link map list, and build our list of + `struct so_list' nodes. */ + lm = first_link_map_member (); + while (lm) + { + struct so_list *new + = (struct so_list *) xmalloc (sizeof (struct so_list)); + memset (new, 0, sizeof (*new)); + + new->lmaddr = lm; + read_memory (lm, (char *) &(new->lm), sizeof (struct link_map)); + + lm = LM_NEXT (new); + + /* For SVR4 versions, the first entry in the link map is for the + inferior executable, so we must ignore it. For some versions of + SVR4, it has no name. For others (Solaris 2.3 for example), it + does have a name, so we can no longer use a missing name to + decide when to ignore it. */ + if (IGNORE_FIRST_LINK_MAP_ENTRY (new)) + { + free_so (new); + } + else + { + int errcode; + char *buffer; + + /* Extract this shared object's name. */ + target_read_string (LM_NAME (new), &buffer, + MAX_PATH_SIZE - 1, &errcode); + if (errcode != 0) + { + warning ("current_sos: Can't read pathname for load map: %s\n", + safe_strerror (errcode)); + } + else + { + strncpy (new->so_name, buffer, MAX_PATH_SIZE - 1); + new->so_name[MAX_PATH_SIZE - 1] = '\0'; + free (buffer); + strcpy (new->so_original_name, new->so_name); + } + + /* If this entry has no name, or its name matches the name + for the main executable, don't include it in the list. */ + if (! new->so_name[0] + || match_main (new->so_name)) + free_so (new); + else + { + new->next = 0; + *link_ptr = new; + link_ptr = &new->next; + } + } + } + + return head; +} + + +/* A small stub to get us past the arg-passing pinhole of catch_errors. */ + +static int +symbol_add_stub (arg) + PTR arg; +{ + register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ + CORE_ADDR text_addr = 0; + + /* Have we already loaded this shared object? */ + ALL_OBJFILES (so->objfile) + { + if (strcmp (so->objfile->name, so->so_name) == 0) + return 1; + } + + /* Find the shared object's text segment. */ + if (so->textsection) + text_addr = so->textsection->addr; + else if (so->abfd != NULL) + { + asection *lowest_sect; + + /* If we didn't find a mapped non zero sized .text section, set up + text_addr so that the relocation in symbol_file_add does no harm. */ + lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); + if (lowest_sect == NULL) + bfd_map_over_sections (so->abfd, find_lowest_section, + (PTR) &lowest_sect); + if (lowest_sect) + text_addr = bfd_section_vma (so->abfd, lowest_sect) + + LM_ADDR (so); + } + + { + struct section_addr_info section_addrs; + + memset (§ion_addrs, 0, sizeof (section_addrs)); + section_addrs.text_addr = text_addr; + + so->objfile = symbol_file_add (so->so_name, so->from_tty, + §ion_addrs, 0, OBJF_SHARED); + } + + return (1); +} + + +/* LOCAL FUNCTION + + solib_add -- synchronize GDB's shared object list with the inferior's + + SYNOPSIS + + void solib_add (char *pattern, 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 for which + GDB has currently loaded symbolic information. If new shared + objects have been loaded, or old shared objects have disappeared, + make the appropriate changes to GDB's tables. + + If PATTERN is non-null, read symbols only for shared objects + whose names match PATTERN. + + If FROM_TTY is non-null, feel free to print messages about what + we're doing. + + If TARGET is non-null, add the sections of all new shared objects + to TARGET's section table. Note that this doesn't remove any + sections for shared objects that have been unloaded, and it + doesn't check to see if the new shared objects are already present in + the section table. But we only use this for core files and + processes we've just attached to, so that's okay. */ + +void +solib_add (char *pattern, int from_tty, struct target_ops *target) +{ + struct so_list *inferior = current_sos (); + struct so_list *gdb, **gdb_link; + + /* #define JIMB_DEBUG */ +#ifdef JIMB_DEBUG + printf ("GDB's shared library list:\n"); + for (gdb = so_list_head; gdb; gdb = gdb->next) + printf (" %s\n", gdb->so_original_name); + printf ("inferior's shared library list:\n"); + for (gdb = inferior; gdb; gdb = gdb->next) + printf (" %s\n", gdb->so_original_name); +#endif + +#ifdef SVR4_SHARED_LIBS + /* If we are attaching to a running process for which we + have not opened a symbol file, we may be able to get its + symbols now! */ + if (attach_flag && + symfile_objfile == NULL) + catch_errors (open_symbol_file_object, (PTR) from_tty, + "Error reading attached process's symbol file.\n", + RETURN_MASK_ALL); + +#endif SVR4_SHARED_LIBS + + if (pattern) + { + char *re_err = re_comp (pattern); + + if (re_err) + error ("Invalid regexp: %s", re_err); + } + + /* Since this function might actually add some elements to the + so_list_head list, arrange for it to be cleaned up when + appropriate. */ + if (!solib_cleanup_queued) + { + make_run_cleanup (do_clear_solib, NULL); + solib_cleanup_queued = 1; + } + + /* GDB and the inferior's dynamic linker each maintain their own + list of currently loaded shared objects; we want to bring the + former in sync with the latter. Scan both lists, seeing which + shared objects appear where. There are three cases: + + - A shared object appears on both lists. This means that GDB + knows about it already, and it's still loaded in the inferior. + Nothing needs to happen. + + - A shared object appears only on GDB's list. This means that + the inferior has unloaded it. We should remove the shared + object from GDB's tables. + + - A shared object appears only on the inferior's list. This + means that it's just been loaded. We should add it to GDB's + tables. + + So we walk GDB's list, checking each entry to see if it appears + in the inferior's list too. If it does, no action is needed, and + we remove it from the inferior's list. If it doesn't, the + inferior has unloaded it, and we remove it from GDB's list. By + the time we're done walking GDB's list, the inferior's list + contains only the new shared objects, which we then add. */ + + gdb = so_list_head; + gdb_link = &so_list_head; + while (gdb) + { + struct so_list *i = inferior; + struct so_list **i_link = &inferior; + + /* Check to see whether the shared object *gdb also appears in + the inferior's current list. */ + while (i) + { + if (! strcmp (gdb->so_original_name, i->so_original_name)) + break; + + i_link = &i->next; + i = *i_link; + } + + /* If the shared object appears on the inferior's list too, then + it's still loaded, so we don't need to do anything. Delete + it from the inferior's list, and leave it on GDB's list. */ + if (i) + { + *i_link = i->next; +#ifdef JIMB_DEBUG + printf ("unchanged: %s\n", i->so_name); +#endif + free_so (i); + gdb_link = &gdb->next; + gdb = *gdb_link; + } + + /* If it's not on the inferior's list, remove it from GDB's tables. */ + else + { + *gdb_link = gdb->next; +#ifdef JIMB_DEBUG + printf ("removed: %s\n", gdb->so_name); +#endif + + /* Unless the user loaded it explicitly, free SO's objfile. */ + if (! (gdb->objfile->flags & OBJF_USERLOADED)) + free_objfile (gdb->objfile); + + /* Some targets' section tables might be referring to + sections from so->abfd; remove them. */ + remove_target_sections (gdb->abfd); + + free_so (gdb); + gdb = *gdb_link; + } + } + + /* Now the inferior's list contains only shared objects that don't + appear in GDB's list --- those that are newly loaded. Add them + to GDB's shared object list, and read in their symbols, if + appropriate. */ + if (inferior) + { + struct so_list *i; + + /* Add the new shared objects to GDB's list. */ + *gdb_link = inferior; + + /* Fill in the rest of each of the `struct so_list' nodes, and + read symbols for those files whose names match PATTERN. */ + for (i = inferior; i; i = i->next) + { + i->from_tty = from_tty; + + /* Fill in the rest of the `struct so_list' node. */ + catch_errors (solib_map_sections, i, + "Error while mapping shared library sections:\n", + RETURN_MASK_ALL); + + if (! pattern || re_exec (i->so_name)) + { + if (i->symbols_loaded) + { + if (from_tty) + printf_unfiltered ("Symbols already loaded for %s\n", + i->so_name); + } + else + { +#ifdef JIMB_DEBUG + printf ("added: %s\n", i->so_name); +#endif + if (catch_errors + (symbol_add_stub, i, + "Error while reading shared library symbols:\n", + RETURN_MASK_ALL)) + { + if (from_tty) + printf_unfiltered ("Loaded symbols for %s\n", + i->so_name); + i->symbols_loaded = 1; + } + } + } + } + + /* If requested, add the shared objects' sections to the the + TARGET's section table. */ + if (target) + { + int new_sections; + + /* Figure out how many sections we'll need to add in total. */ + new_sections = 0; + for (i = inferior; i; i = i->next) + new_sections += (i->sections_end - i->sections); + + if (new_sections > 0) + { + int space = target_resize_to_sections (target, new_sections); + + for (i = inferior; i; i = i->next) + { + int count = (i->sections_end - i->sections); + memcpy (target->to_sections + space, + i->sections, + count * sizeof (i->sections[0])); + space += count; + } + } + } + + /* Getting new symbols may change our opinion about what is + frameless. */ + reinit_frame_cache (); + + special_symbol_handling (); + } + +#ifdef JIMB_DEBUG + putchar ('\n'); +#endif +} + + +/* + + LOCAL FUNCTION + + info_sharedlibrary_command -- code for "info sharedlibrary" + + SYNOPSIS + + static void info_sharedlibrary_command () + + DESCRIPTION + + Walk through the shared library list and print information + about each attached library. + */ + +static void +info_sharedlibrary_command (ignore, from_tty) + char *ignore; + int from_tty; +{ + register struct so_list *so = NULL; /* link map state variable */ + int header_done = 0; + int addr_width; + char *addr_fmt; + + if (exec_bfd == NULL) + { + printf_unfiltered ("No executable file.\n"); + return; + } + +#ifndef TARGET_ELF64 + addr_width = 8 + 4; + addr_fmt = "08l"; +#else + addr_width = 16 + 4; + addr_fmt = "016l"; +#endif + + solib_add (0, 0, 0); + + for (so = so_list_head; so; so = so->next) + { + if (so->so_name[0]) + { + if (!header_done) + { + printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From", + addr_width, "To", "Syms Read", + "Shared Object Library"); + header_done++; + } + + printf_unfiltered ("%-*s", addr_width, + local_hex_string_custom ((unsigned long) LM_ADDR (so), + addr_fmt)); + printf_unfiltered ("%-*s", addr_width, + local_hex_string_custom ((unsigned long) so->lmend, + addr_fmt)); + printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); + printf_unfiltered ("%s\n", so->so_name); + } + } + if (so_list_head == NULL) + { + printf_unfiltered ("No shared libraries loaded at this time.\n"); + } +} + +/* + + GLOBAL FUNCTION + + solib_address -- check to see if an address is in a shared lib + + SYNOPSIS + + char * solib_address (CORE_ADDR address) + + DESCRIPTION + + Provides a hook for other gdb routines to discover whether or + not a particular address is within the mapped address space of + a shared library. Any address between the base mapping address + and the first address beyond the end of the last mapping, is + considered to be within the shared library address space, for + our purposes. + + For example, this routine is called at one point to disable + breakpoints which are in shared libraries that are not currently + mapped in. + */ + +char * +solib_address (address) + CORE_ADDR address; +{ + register struct so_list *so = 0; /* link map state variable */ + + for (so = so_list_head; so; so = so->next) + { + if (LM_ADDR (so) <= address && address < so->lmend) + return (so->so_name); + } + + return (0); +} + +/* Called by free_all_symtabs */ + +void +clear_solib () +{ + /* This function is expected to handle ELF shared libraries. It is + also used on Solaris, which can run either ELF or a.out binaries + (for compatibility with SunOS 4), both of which can use shared + libraries. So we don't know whether we have an ELF executable or + an a.out executable until the user chooses an executable file. + + ELF shared libraries don't get mapped into the address space + until after the program starts, so we'd better not try to insert + breakpoints in them immediately. We have to wait until the + dynamic linker has loaded them; we'll hit a bp_shlib_event + breakpoint (look for calls to create_solib_event_breakpoint) when + it's ready. + + SunOS shared libraries seem to be different --- they're present + as soon as the process begins execution, so there's no need to + put off inserting breakpoints. There's also nowhere to put a + bp_shlib_event breakpoint, so if we put it off, we'll never get + around to it. + + So: disable breakpoints only if we're using ELF shared libs. */ + if (exec_bfd != NULL + && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour) + disable_breakpoints_in_shlibs (1); + + while (so_list_head) + { + struct so_list *so = so_list_head; + so_list_head = so->next; + free_so (so); + } + + debug_base = 0; +} + +static void +do_clear_solib (dummy) + PTR dummy; +{ + solib_cleanup_queued = 0; + clear_solib (); +} + +#ifdef SVR4_SHARED_LIBS + +/* Return 1 if PC lies in the dynamic symbol resolution code of the + SVR4 run time loader. */ + +static CORE_ADDR interp_text_sect_low; +static CORE_ADDR interp_text_sect_high; +static CORE_ADDR interp_plt_sect_low; +static CORE_ADDR interp_plt_sect_high; + +int +in_svr4_dynsym_resolve_code (pc) + CORE_ADDR pc; +{ + return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) + || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) + || in_plt_section (pc, NULL)); +} +#endif + +/* + + LOCAL FUNCTION + + disable_break -- remove the "mapping changed" breakpoint + + SYNOPSIS + + static int disable_break () + + DESCRIPTION + + Removes the breakpoint that gets hit when the dynamic linker + completes a mapping change. + + */ + +#ifndef SVR4_SHARED_LIBS + +static int +disable_break () +{ + int status = 1; + +#ifndef SVR4_SHARED_LIBS + + int in_debugger = 0; + + /* Read the debugger structure from the inferior to retrieve the + address of the breakpoint and the original contents of the + breakpoint address. Remove the breakpoint by writing the original + contents back. */ + + read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); + + /* Set `in_debugger' to zero now. */ + + write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); + + breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr); + write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, + sizeof (debug_copy.ldd_bp_inst)); + +#else /* SVR4_SHARED_LIBS */ + + /* Note that breakpoint address and original contents are in our address + space, so we just need to write the original contents back. */ + + if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) + { + status = 0; + } + +#endif /* !SVR4_SHARED_LIBS */ + + /* For the SVR4 version, we always know the breakpoint address. For the + SunOS version we don't know it until the above code is executed. + Grumble if we are stopped anywhere besides the breakpoint address. */ + + if (stop_pc != breakpoint_addr) + { + warning ("stopped at unknown breakpoint while handling shared libraries"); + } + + return (status); +} + +#endif /* #ifdef SVR4_SHARED_LIBS */ + +/* + + LOCAL FUNCTION + + enable_break -- arrange for dynamic linker to hit breakpoint + + SYNOPSIS + + int enable_break (void) + + DESCRIPTION + + Both the SunOS and the SVR4 dynamic linkers have, as part of their + debugger interface, support for arranging for the inferior to hit + a breakpoint after mapping in the shared libraries. This function + enables that breakpoint. + + For SunOS, there is a special flag location (in_debugger) which we + set to 1. When the dynamic linker sees this flag set, it will set + a breakpoint at a location known only to itself, after saving the + original contents of that place and the breakpoint address itself, + in it's own internal structures. When we resume the inferior, it + will eventually take a SIGTRAP when it runs into the breakpoint. + We handle this (in a different place) by restoring the contents of + the breakpointed location (which is only known after it stops), + chasing around to locate the shared libraries that have been + loaded, then resuming. + + For SVR4, the debugger interface structure contains a member (r_brk) + which is statically initialized at the time the shared library is + built, to the offset of a function (_r_debug_state) which is guaran- + teed to be called once before mapping in a library, and again when + the mapping is complete. At the time we are examining this member, + it contains only the unrelocated offset of the function, so we have + to do our own relocation. Later, when the dynamic linker actually + runs, it relocates r_brk to be the actual address of _r_debug_state(). + + The debugger interface structure also contains an enumeration which + is set to either RT_ADD or RT_DELETE prior to changing the mapping, + depending upon whether or not the library is being mapped or unmapped, + and then set to RT_CONSISTENT after the library is mapped/unmapped. + */ + +static int +enable_break () +{ + int success = 0; + +#ifndef SVR4_SHARED_LIBS + + int j; + int in_debugger; + + /* Get link_dynamic structure */ + + j = target_read_memory (debug_base, (char *) &dynamic_copy, + sizeof (dynamic_copy)); + if (j) + { + /* unreadable */ + return (0); + } + + /* Calc address of debugger interface structure */ + + debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); + + /* Calc address of `in_debugger' member of debugger interface structure */ + + flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - + (char *) &debug_copy); + + /* Write a value of 1 to this member. */ + + in_debugger = 1; + write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); + success = 1; + +#else /* SVR4_SHARED_LIBS */ + +#ifdef BKPT_AT_SYMBOL + + struct minimal_symbol *msymbol; + char **bkpt_namep; + asection *interp_sect; + + /* First, remove all the solib event breakpoints. Their addresses + may have changed since the last time we ran the program. */ + remove_solib_event_breakpoints (); + +#ifdef SVR4_SHARED_LIBS + interp_text_sect_low = interp_text_sect_high = 0; + interp_plt_sect_low = interp_plt_sect_high = 0; + + /* Find the .interp section; if not found, warn the user and drop + into the old breakpoint at symbol code. */ + interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); + if (interp_sect) + { + unsigned int interp_sect_size; + char *buf; + CORE_ADDR load_addr; + bfd *tmp_bfd; + CORE_ADDR sym_addr = 0; + + /* Read the contents of the .interp section into a local buffer; + the contents specify the dynamic linker this program uses. */ + interp_sect_size = bfd_section_size (exec_bfd, interp_sect); + buf = alloca (interp_sect_size); + bfd_get_section_contents (exec_bfd, interp_sect, + buf, 0, interp_sect_size); + + /* Now we need to figure out where the dynamic linker was + loaded so that we can load its symbols and place a breakpoint + in the dynamic linker itself. + + This address is stored on the stack. However, I've been unable + to find any magic formula to find it for Solaris (appears to + be trivial on GNU/Linux). Therefore, we have to try an alternate + mechanism to find the dynamic linker's base address. */ + tmp_bfd = bfd_openr (buf, gnutarget); + if (tmp_bfd == NULL) + goto bkpt_at_symbol; + + /* Make sure the dynamic linker's really a useful object. */ + if (!bfd_check_format (tmp_bfd, bfd_object)) + { + warning ("Unable to grok dynamic linker %s as an object file", buf); + bfd_close (tmp_bfd); + goto bkpt_at_symbol; + } + + /* We find the dynamic linker's base address by examining the + current pc (which point at the entry point for the dynamic + linker) and subtracting the offset of the entry point. */ + load_addr = read_pc () - tmp_bfd->start_address; + + /* Record the relocated start and end address of the dynamic linker + text and plt section for in_svr4_dynsym_resolve_code. */ + interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); + if (interp_sect) + { + interp_text_sect_low = + bfd_section_vma (tmp_bfd, interp_sect) + load_addr; + interp_text_sect_high = + interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); + } + interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); + if (interp_sect) + { + interp_plt_sect_low = + bfd_section_vma (tmp_bfd, interp_sect) + load_addr; + interp_plt_sect_high = + interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); + } + + /* Now try to set a breakpoint in the dynamic linker. */ + for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) + { + sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); + if (sym_addr != 0) + break; + } + + /* We're done with the temporary bfd. */ + bfd_close (tmp_bfd); + + if (sym_addr != 0) + { + create_solib_event_breakpoint (load_addr + sym_addr); + return 1; + } + + /* For whatever reason we couldn't set a breakpoint in the dynamic + linker. Warn and drop into the old code. */ + bkpt_at_symbol: + warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); + } +#endif + + /* Scan through the list of symbols, trying to look up the symbol and + set a breakpoint there. Terminate loop when we/if we succeed. */ + + breakpoint_addr = 0; + for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) + { + msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); + if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) + { + create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); + return 1; + } + } + + /* Nothing good happened. */ + success = 0; + +#endif /* BKPT_AT_SYMBOL */ + +#endif /* !SVR4_SHARED_LIBS */ + + return (success); +} + +/* + + GLOBAL FUNCTION + + solib_create_inferior_hook -- shared library startup support + + SYNOPSIS + + void solib_create_inferior_hook() + + DESCRIPTION + + When gdb starts up the inferior, it nurses it along (through the + shell) until it is ready to execute it's first instruction. At this + point, this function gets called via expansion of the macro + SOLIB_CREATE_INFERIOR_HOOK. + + For SunOS executables, this first instruction is typically the + one at "_start", or a similar text label, regardless of whether + the executable is statically or dynamically linked. The runtime + startup code takes care of dynamically linking in any shared + libraries, once gdb allows the inferior to continue. + + For SVR4 executables, this first instruction is either the first + instruction in the dynamic linker (for dynamically linked + executables) or the instruction at "start" for statically linked + executables. For dynamically linked executables, the system + first exec's /lib/libc.so.N, which contains the dynamic linker, + and starts it running. The dynamic linker maps in any needed + shared libraries, maps in the actual user executable, and then + jumps to "start" in the user executable. + + For both SunOS shared libraries, and SVR4 shared libraries, we + can arrange to cooperate with the dynamic linker to discover the + names of shared libraries that are dynamically linked, and the + base addresses to which they are linked. + + This function is responsible for discovering those names and + addresses, and saving sufficient information about them to allow + their symbols to be read at a later time. + + FIXME + + Between enable_break() and disable_break(), this code does not + properly handle hitting breakpoints which the user might have + set in the startup code or in the dynamic linker itself. Proper + handling will probably have to wait until the implementation is + changed to use the "breakpoint handler function" method. + + Also, what if child has exit()ed? Must exit loop somehow. + */ + +void +solib_create_inferior_hook () +{ + /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base + yet. In fact, in the case of a SunOS4 executable being run on + Solaris, we can't get it yet. current_sos will get it when it needs + it. */ +#if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) + if ((debug_base = locate_base ()) == 0) + { + /* Can't find the symbol or the executable is statically linked. */ + return; + } +#endif + + if (!enable_break ()) + { + warning ("shared library handler failed to enable breakpoint"); + return; + } + +#if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS) + /* SCO and SunOS need the loop below, other systems should be using the + special shared library breakpoints and the shared library breakpoint + service routine. + + Now run the target. It will eventually hit the breakpoint, at + which point all of the libraries will have been mapped in and we + can go groveling around in the dynamic linker structures to find + out what we need to know about them. */ + + clear_proceed_status (); + stop_soon_quietly = 1; + stop_signal = TARGET_SIGNAL_0; + do + { + target_resume (-1, 0, stop_signal); + wait_for_inferior (); + } + while (stop_signal != TARGET_SIGNAL_TRAP); + stop_soon_quietly = 0; + +#if !defined(_SCO_DS) + /* We are now either at the "mapping complete" breakpoint (or somewhere + else, a condition we aren't prepared to deal with anyway), so adjust + the PC as necessary after a breakpoint, disable the breakpoint, and + add any shared libraries that were mapped in. */ + + if (DECR_PC_AFTER_BREAK) + { + stop_pc -= DECR_PC_AFTER_BREAK; + write_register (PC_REGNUM, stop_pc); + } + + if (!disable_break ()) + { + warning ("shared library handler failed to disable breakpoint"); + } + + if (auto_solib_add) + solib_add ((char *) 0, 0, (struct target_ops *) 0); +#endif /* ! _SCO_DS */ +#endif +} + +/* + + LOCAL FUNCTION + + special_symbol_handling -- additional shared library symbol handling + + SYNOPSIS + + void special_symbol_handling () + + DESCRIPTION + + Once the symbols from a shared object have been loaded in the usual + way, we are called to do any system specific symbol handling that + is needed. + + For SunOS4, this consists of grunging around in the dynamic + linkers structures to find symbol definitions for "common" symbols + and adding them to the minimal symbol table for the runtime common + objfile. + + */ + +static void +special_symbol_handling () +{ +#ifndef SVR4_SHARED_LIBS + int j; + + if (debug_addr == 0) + { + /* Get link_dynamic structure */ + + j = target_read_memory (debug_base, (char *) &dynamic_copy, + sizeof (dynamic_copy)); + if (j) + { + /* unreadable */ + return; + } + + /* Calc address of debugger interface structure */ + /* FIXME, this needs work for cross-debugging of core files + (byteorder, size, alignment, etc). */ + + debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); + } + + /* Read the debugger structure from the inferior, just to make sure + we have a current copy. */ + + j = target_read_memory (debug_addr, (char *) &debug_copy, + sizeof (debug_copy)); + if (j) + return; /* unreadable */ + + /* Get common symbol definitions for the loaded object. */ + + if (debug_copy.ldd_cp) + { + solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp)); + } + +#endif /* !SVR4_SHARED_LIBS */ +} + + +/* + + LOCAL FUNCTION + + sharedlibrary_command -- handle command to explicitly add library + + SYNOPSIS + + static void sharedlibrary_command (char *args, int from_tty) + + DESCRIPTION + + */ + +static void +sharedlibrary_command (args, from_tty) + char *args; + int from_tty; +{ + dont_repeat (); + solib_add (args, from_tty, (struct target_ops *) 0); +} + +#endif /* HAVE_LINK_H */ + +void +_initialize_solib () +{ +#ifdef HAVE_LINK_H + + add_com ("sharedlibrary", class_files, sharedlibrary_command, + "Load shared object library symbols for files matching REGEXP."); + add_info ("sharedlibrary", info_sharedlibrary_command, + "Status of loaded shared object libraries."); + + add_show_from_set + (add_set_cmd ("auto-solib-add", class_support, var_zinteger, + (char *) &auto_solib_add, + "Set autoloading of shared library symbols.\n\ +If nonzero, symbols from all shared object libraries will be loaded\n\ +automatically when the inferior begins execution or when the dynamic linker\n\ +informs gdb that a new library has been loaded. Otherwise, symbols\n\ +must be loaded manually, using `sharedlibrary'.", + &setlist), + &showlist); + + add_show_from_set + (add_set_cmd ("solib-absolute-prefix", class_support, var_filename, + (char *) &solib_absolute_prefix, + "Set prefix for loading absolute shared library symbol files.\n\ +For other (relative) files, you can add values using `set solib-search-path'.", + &setlist), + &showlist); + add_show_from_set + (add_set_cmd ("solib-search-path", class_support, var_string, + (char *) &solib_search_path, + "Set the search path for loading non-absolute shared library symbol files.\n\ +This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.", + &setlist), + &showlist); + +#endif /* HAVE_LINK_H */ }