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Diffstat (limited to 'gdb/solib.c')
| -rw-r--r-- | gdb/solib.c | 1890 |
1 files changed, 0 insertions, 1890 deletions
diff --git a/gdb/solib.c b/gdb/solib.c deleted file mode 100644 index c8a8ce7..0000000 --- a/gdb/solib.c +++ /dev/null @@ -1,1890 +0,0 @@ -/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. - Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998 - Free Software Foundation, Inc. - -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 distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - - -#include "defs.h" - -/* This file is only compilable if link.h is available. */ - -#ifdef HAVE_LINK_H - -#include <sys/types.h> -#include <signal.h> -#include "gdb_string.h" -#include <sys/param.h> -#include <fcntl.h> -#include <unistd.h> - -#ifndef SVR4_SHARED_LIBS - /* SunOS shared libs need the nlist structure. */ -#include <a.out.h> -#else -#include "elf/external.h" -#endif - -#include <link.h> - -#include "symtab.h" -#include "bfd.h" -#include "symfile.h" -#include "objfiles.h" -#include "gdbcore.h" -#include "command.h" -#include "target.h" -#include "frame.h" -#include "gnu-regex.h" -#include "inferior.h" -#include "environ.h" -#include "language.h" -#include "gdbcmd.h" - -#define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */ - -/* On SVR4 systems, a list of symbols in the dynamic linker where - GDB can try to place a breakpoint to monitor shared library - events. - - If none of these symbols are found, or other errors occur, then - SVR4 systems will fall back to using a symbol as the "startup - mapping complete" breakpoint address. */ - -#ifdef SVR4_SHARED_LIBS -static char *solib_break_names[] = { - "r_debug_state", - "_r_debug_state", - "_dl_debug_state", - "rtld_db_dlactivity", - NULL -}; -#endif - -#define 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 */ - -#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; -}; - -static struct so_list *so_list_head; /* List of known shared objects */ -static CORE_ADDR debug_base; /* Base of dynamic linker structures */ -static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ - -static int solib_cleanup_queued = 0; /* make_run_cleanup called */ - -extern int -fdmatch PARAMS ((int, int)); /* In libiberty */ - -/* Local function prototypes */ - -static void -do_clear_solib PARAMS ((PTR)); - -static int -match_main PARAMS ((char *)); - -static void -special_symbol_handling PARAMS ((struct so_list *)); - -static 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 struct so_list * -find_solib PARAMS ((struct so_list *)); - -static struct link_map * -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 int -disable_break PARAMS ((void)); - -static void -allocate_rt_common_objfile PARAMS ((void)); - -static void -solib_add_common_symbols PARAMS ((struct rtc_symb *)); - -#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; - 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 (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. */ - - 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++) - { - /* 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")) - { - so -> textsection = p; - } - } - - /* Free the file names, close the file now. */ - do_cleanups (old_chain); - - return (1); -} - -#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 ((make_cleanup_func) 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); -} - -#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 CORE_ADDR -bfd_lookup_symbol (abfd, symname) - bfd *abfd; - char *symname; -{ - 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); - - 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; - } - } - do_cleanups (back_to); - } - 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 - -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. - - 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; -{ - bfd *interp_bfd; - CORE_ADDR address = 0; - char **symbolp; - - /* If the fd is -1, then there is no file that corresponds to this - mapped memory segment, so skip it. Also, if the fd corresponds - to the exec file, skip it as well. */ - - if (fd == -1 - || (exec_bfd != NULL - && fdmatch (fileno ((FILE *)(exec_bfd -> iostream)), fd))) - { - return (0); - } - - /* 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); - } - - /* 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. */ - - 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 - - elf_locate_base -- locate the base address of dynamic linker structs - for SVR4 elf targets. - -SYNOPSIS - - CORE_ADDR elf_locate_base (void) - -DESCRIPTION - - For SVR4 elf targets the address of the dynamic linker's runtime - structure is contained within the dynamic info section in the - executable file. The dynamic section is also mapped into the - inferior address space. Because the runtime loader fills in the - real address before starting the inferior, we have to read in the - dynamic info section from the inferior address space. - If there are any errors while trying to find the address, we - silently return 0, otherwise the found address is returned. - - */ - -static CORE_ADDR -elf_locate_base () -{ - sec_ptr dyninfo_sect; - int dyninfo_sect_size; - CORE_ADDR dyninfo_addr; - char *buf; - char *bufend; - - /* Find the start address of the .dynamic section. */ - dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); - if (dyninfo_sect == NULL) - return 0; - dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); - - /* Read in .dynamic section, silently ignore errors. */ - dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); - buf = alloca (dyninfo_sect_size); - if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) - return 0; - - /* Find the DT_DEBUG entry in the the .dynamic section. - For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has - no DT_DEBUG entries. */ -#ifndef TARGET_ELF64 - for (bufend = buf + dyninfo_sect_size; - buf < bufend; - buf += sizeof (Elf32_External_Dyn)) - { - Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *)buf; - long dyn_tag; - CORE_ADDR dyn_ptr; - - dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); - if (dyn_tag == DT_NULL) - break; - else if (dyn_tag == DT_DEBUG) - { - dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); - return dyn_ptr; - } -#ifdef DT_MIPS_RLD_MAP - else if (dyn_tag == DT_MIPS_RLD_MAP) - { - char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; - - /* DT_MIPS_RLD_MAP contains a pointer to the address - of the dynamic link structure. */ - dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); - if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) - return 0; - return extract_unsigned_integer (pbuf, sizeof (pbuf)); - } -#endif - } -#else /* ELF64 */ - for (bufend = buf + dyninfo_sect_size; - buf < bufend; - buf += sizeof (Elf64_External_Dyn)) - { - Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *)buf; - long dyn_tag; - CORE_ADDR dyn_ptr; - - dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); - if (dyn_tag == DT_NULL) - break; - else if (dyn_tag == DT_DEBUG) - { - dyn_ptr = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); - return dyn_ptr; - } - } -#endif - - /* DT_DEBUG entry not found. */ - return 0; -} - -#endif /* SVR4_SHARED_LIBS */ - -/* - -LOCAL FUNCTION - - 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 struct link_map *first_link_map_member (void) - -DESCRIPTION - - Read in a copy of the first member in the inferior's dynamic - link map from the inferior's dynamic linker structures, and return - a pointer to the copy in our address space. -*/ - -static struct link_map * -first_link_map_member () -{ - struct link_map *lm = NULL; - -#ifndef SVR4_SHARED_LIBS - - read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); - if (dynamic_copy.ld_version >= 2) - { - /* It is a version that we can deal with, so read in the secondary - structure and find the address of the link map list from it. */ - read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy, - sizeof (struct link_dynamic_2)); - lm = ld_2_copy.ld_loaded; - } - -#else /* SVR4_SHARED_LIBS */ - - read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); - /* FIXME: Perhaps we should validate the info somehow, perhaps by - checking r_version for a known version number, or r_state for - RT_CONSISTENT. */ - lm = debug_copy.r_map; - -#endif /* !SVR4_SHARED_LIBS */ - - return (lm); -} - -/* - -LOCAL FUNCTION - - 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. - - The arg and return value are "struct link_map" pointers, as defined - in <link.h>. - */ - -static struct so_list * -find_solib (so_list_ptr) - struct so_list *so_list_ptr; /* Last lm or NULL for first one */ -{ - struct so_list *so_list_next = NULL; - struct link_map *lm = NULL; - struct so_list *new; - - if (so_list_ptr == NULL) - { - /* We are setting up for a new scan through the loaded images. */ - if ((so_list_next = so_list_head) == NULL) - { - /* 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 - { - lm = NULL; - } - } - 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; - - if (! solib_cleanup_queued) - { - make_run_cleanup (do_clear_solib, NULL); - solib_cleanup_queued = 1; - } - - } - 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) - { - warning ("find_solib: Can't read pathname for load map: %s\n", - safe_strerror (errcode)); - return (so_list_next); - } - strncpy (new -> so_name, buffer, MAX_PATH_SIZE - 1); - new -> so_name[MAX_PATH_SIZE - 1] = '\0'; - free (buffer); - catch_errors (solib_map_sections, new, - "Error while mapping shared library sections:\n", - RETURN_MASK_ALL); - } - } - return (so_list_next); -} - -/* 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; - - 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) - + (CORE_ADDR) LM_ADDR (so); - } - - ALL_OBJFILES (so -> objfile) - { - if (strcmp (so -> objfile -> name, so -> so_name) == 0) - return 1; - } - so -> objfile = - symbol_file_add (so -> so_name, so -> from_tty, - text_addr, - 0, 0, 0, 0, 1); - return (1); -} - -/* This function will check the so name to see if matches the main list. - In some system the main object is in the list, which we want to exclude */ - -static int match_main (soname) - char *soname; -{ - char **mainp; - - for (mainp = main_name_list; *mainp != NULL; mainp++) - { - if (strcmp (soname, *mainp) == 0) - return (1); - } - - return (0); -} - -/* - -GLOBAL FUNCTION - - solib_add -- add a shared library file to the symtab and section list - -SYNOPSIS - - void solib_add (char *arg_string, int from_tty, - struct target_ops *target) - -DESCRIPTION - -*/ - -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) - { - 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; - } - - /* Add these section table entries to the target's table. */ - while ((so = find_solib (so)) != NULL) - { - if (so -> so_name[0]) - { - count = so -> sections_end - so -> sections; - memcpy ((char *) (target -> to_sections + old), - so -> sections, - (sizeof (struct section_table)) * count); - old += count; - } - } - } - } - - /* Now add the symbol files. */ - while ((so = find_solib (so)) != NULL) - { - if (so -> so_name[0] && re_exec (so -> so_name) && - !match_main (so -> so_name)) - { - so -> from_tty = from_tty; - if (so -> symbols_loaded) - { - if (from_tty) - { - printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name); - } - } - else if (catch_errors - (symbol_add_stub, so, - "Error while reading shared library symbols:\n", - RETURN_MASK_ALL)) - { - so_last = so; - so -> symbols_loaded = 1; - } - } - } - - /* Getting new symbols may change our opinion about what is - frameless. */ - if (so_last) - reinit_frame_cache (); - - if (so_last) - special_symbol_handling (so_last); -} - -/* - -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 exec file.\n"); - return; - } - -#ifndef TARGET_ELF64 - addr_width = 8+4; - addr_fmt = "08l"; -#else - addr_width = 16+4; - addr_fmt = "016l"; -#endif - - while ((so = find_solib (so)) != NULL) - { - if (so -> so_name[0]) - { - if (!header_done) - { - printf_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 */ - - while ((so = find_solib (so)) != NULL) - { - if (so -> so_name[0]) - { - if ((address >= (CORE_ADDR) LM_ADDR (so)) && - (address < (CORE_ADDR) so -> lmend)) - return (so->so_name); - } - } - return (0); -} - -/* Called by free_all_symtabs */ - -void -clear_solib() -{ - struct so_list *next; - char *bfd_filename; - - disable_breakpoints_in_shlibs (1); - - while (so_list_head) - { - if (so_list_head -> sections) - { - free ((PTR)so_list_head -> sections); - } - if (so_list_head -> abfd) - { - bfd_filename = bfd_get_filename (so_list_head -> abfd); - 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; -} - -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 = (CORE_ADDR) debug_copy.ldd_bp_addr; - write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, - sizeof (debug_copy.ldd_bp_inst)); - -#else /* SVR4_SHARED_LIBS */ - - /* Note that breakpoint address and original contents are in our address - space, so we just need to write the original contents back. */ - - if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) - { - status = 0; - } - -#endif /* !SVR4_SHARED_LIBS */ - - /* For the SVR4 version, we always know the breakpoint address. For the - SunOS version we don't know it until the above code is executed. - Grumble if we are stopped anywhere besides the breakpoint address. */ - - 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 = (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 - 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. find_solib will get it when it needs - it. */ -#if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) - if ((debug_base = locate_base ()) == 0) - { - /* Can't find the symbol or the executable is statically linked. */ - return; - } -#endif - - if (!enable_break ()) - { - warning ("shared library handler failed to enable breakpoint"); - return; - } - -#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 (struct so_list *so) - -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 (so) -struct so_list *so; -{ -#ifndef SVR4_SHARED_LIBS - int j; - - if (debug_addr == 0) - { - /* Get link_dynamic structure */ - - j = target_read_memory (debug_base, (char *) &dynamic_copy, - sizeof (dynamic_copy)); - if (j) - { - /* unreadable */ - return; - } - - /* Calc address of debugger interface structure */ - /* FIXME, this needs work for cross-debugging of core files - (byteorder, size, alignment, etc). */ - - debug_addr = (CORE_ADDR) dynamic_copy.ldd; - } - - /* Read the debugger structure from the inferior, just to make sure - we have a current copy. */ - - 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 */ -} - - -/* - -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 */ -} |