| /* Handle HP ELF shared libraries for GDB, the GNU Debugger. |
| |
| Copyright 1999, 2000, 2001, 2002, 2003 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. |
| |
| HP in their infinite stupidity choose not to use standard ELF dynamic |
| linker interfaces. They also choose not to make their ELF dymamic |
| linker interfaces compatible with the SOM dynamic linker. The |
| net result is we can not use either of the existing somsolib.c or |
| solib.c. What a crock. |
| |
| Even more disgusting. This file depends on functions provided only |
| in certain PA64 libraries. Thus this file is supposed to only be |
| used native. When will HP ever learn that they need to provide the |
| same functionality in all their libraries! */ |
| |
| #include <dlfcn.h> |
| #include <elf.h> |
| #include <elf_hp.h> |
| |
| #include "defs.h" |
| |
| #include "frame.h" |
| #include "bfd.h" |
| #include "libhppa.h" |
| #include "gdbcore.h" |
| #include "symtab.h" |
| #include "breakpoint.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "inferior.h" |
| #include "gdb-stabs.h" |
| #include "gdb_stat.h" |
| #include "gdbcmd.h" |
| #include "language.h" |
| #include "regcache.h" |
| #include "exec.h" |
| |
| #include <fcntl.h> |
| |
| #ifndef O_BINARY |
| #define O_BINARY 0 |
| #endif |
| |
| static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
| /* This lives in hppa-tdep.c. */ |
| extern struct unwind_table_entry *find_unwind_entry (CORE_ADDR pc); |
| |
| /* These ought to be defined in some public interface, but aren't. They |
| identify dynamic linker events. */ |
| #define DLD_CB_LOAD 1 |
| #define DLD_CB_UNLOAD 0 |
| |
| /* A structure to keep track of all the known shared objects. */ |
| struct so_list |
| { |
| bfd *abfd; |
| char *name; |
| struct so_list *next; |
| struct objfile *objfile; |
| CORE_ADDR pa64_solib_desc_addr; |
| struct load_module_desc pa64_solib_desc; |
| struct section_table *sections; |
| struct section_table *sections_end; |
| int loaded; |
| }; |
| |
| static struct so_list *so_list_head; |
| |
| /* This is the cumulative size in bytes of the symbol tables of all |
| shared objects on the so_list_head list. (When we say size, here |
| we mean of the information before it is brought into memory and |
| potentially expanded by GDB.) When adding a new shlib, this value |
| is compared against a threshold size, held by auto_solib_limit (in |
| megabytes). If adding symbols for the new shlib would cause the |
| total size to exceed the threshold, then the new shlib's symbols |
| are not loaded. */ |
| static LONGEST pa64_solib_total_st_size; |
| |
| /* When the threshold is reached for any shlib, we refuse to add |
| symbols for subsequent shlibs, even if those shlibs' symbols would |
| be small enough to fit under the threshold. Although this may |
| result in one, early large shlib preventing the loading of later, |
| smaller shlibs' symbols, it allows us to issue one informational |
| message. The alternative, to issue a message for each shlib whose |
| symbols aren't loaded, could be a big annoyance where the threshold |
| is exceeded due to a very large number of shlibs. */ |
| static int pa64_solib_st_size_threshold_exceeded; |
| |
| /* When adding fields, be sure to clear them in _initialize_pa64_solib. */ |
| typedef struct |
| { |
| CORE_ADDR dld_flags_addr; |
| LONGEST dld_flags; |
| struct bfd_section *dyninfo_sect; |
| int have_read_dld_descriptor; |
| int is_valid; |
| CORE_ADDR load_map; |
| CORE_ADDR load_map_addr; |
| struct load_module_desc dld_desc; |
| } |
| dld_cache_t; |
| |
| static dld_cache_t dld_cache; |
| |
| static void pa64_sharedlibrary_info_command (char *, int); |
| |
| static void pa64_solib_sharedlibrary_command (char *, int); |
| |
| static void *pa64_target_read_memory (void *, CORE_ADDR, size_t, int); |
| |
| static int read_dld_descriptor (struct target_ops *, int readsyms); |
| |
| static int read_dynamic_info (asection *, dld_cache_t *); |
| |
| static void add_to_solist (int, char *, int, struct load_module_desc *, |
| CORE_ADDR, struct target_ops *); |
| |
| /* When examining the shared library for debugging information we have to |
| look for HP debug symbols, stabs and dwarf2 debug symbols. */ |
| static char *pa64_debug_section_names[] = { |
| ".debug_header", ".debug_gntt", ".debug_lntt", ".debug_slt", ".debug_vt", |
| ".stabs", ".stabstr", ".debug_info", ".debug_abbrev", ".debug_aranges", |
| ".debug_macinfo", ".debug_line", ".debug_loc", ".debug_pubnames", |
| ".debug_str", NULL |
| }; |
| |
| /* Return a ballbark figure for the amount of memory GDB will need to |
| allocate to read in the debug symbols from FILENAME. */ |
| static LONGEST |
| pa64_solib_sizeof_symbol_table (char *filename) |
| { |
| bfd *abfd; |
| int i; |
| int desc; |
| char *absolute_name; |
| LONGEST st_size = (LONGEST) 0; |
| asection *sect; |
| |
| /* We believe that filename was handed to us by the dynamic linker, and |
| is therefore always an absolute path. */ |
| desc = openp (getenv ("PATH"), 1, filename, O_RDONLY | O_BINARY, |
| 0, &absolute_name); |
| if (desc < 0) |
| { |
| perror_with_name (filename); |
| } |
| filename = absolute_name; |
| |
| abfd = bfd_fdopenr (filename, gnutarget, desc); |
| if (!abfd) |
| { |
| close (desc); |
| make_cleanup (xfree, filename); |
| error ("\"%s\": can't open to read symbols: %s.", filename, |
| bfd_errmsg (bfd_get_error ())); |
| } |
| |
| if (!bfd_check_format (abfd, bfd_object)) |
| { |
| bfd_close (abfd); |
| make_cleanup (xfree, filename); |
| error ("\"%s\": can't read symbols: %s.", filename, |
| bfd_errmsg (bfd_get_error ())); |
| } |
| |
| /* Sum the sizes of the various sections that compose debug info. */ |
| for (i = 0; pa64_debug_section_names[i] != NULL; i++) |
| { |
| asection *sect; |
| |
| sect = bfd_get_section_by_name (abfd, pa64_debug_section_names[i]); |
| if (sect) |
| st_size += (LONGEST)bfd_section_size (abfd, sect); |
| } |
| |
| bfd_close (abfd); |
| xfree (filename); |
| |
| /* Unfortunately, just summing the sizes of various debug info |
| sections isn't a very accurate measurement of how much heap |
| space the debugger will need to hold them. It also doesn't |
| account for space needed by linker (aka "minimal") symbols. |
| |
| Anecdotal evidence suggests that just summing the sizes of |
| debug-info-related sections understates the heap space needed |
| to represent it internally by about an order of magnitude. |
| |
| Since it's not exactly brain surgery we're doing here, rather |
| than attempt to more accurately measure the size of a shlib's |
| symbol table in GDB's heap, we'll just apply a 10x fudge- |
| factor to the debug info sections' size-sum. No, this doesn't |
| account for minimal symbols in non-debuggable shlibs. But it |
| all roughly washes out in the end. */ |
| return st_size * (LONGEST) 10; |
| } |
| |
| /* Add a shared library to the objfile list and load its symbols into |
| GDB's symbol table. */ |
| static void |
| pa64_solib_add_solib_objfile (struct so_list *so, char *name, int from_tty, |
| CORE_ADDR text_addr) |
| { |
| bfd *tmp_bfd; |
| asection *sec; |
| obj_private_data_t *obj_private; |
| struct section_addr_info *section_addrs; |
| struct cleanup *my_cleanups; |
| |
| /* We need the BFD so that we can look at its sections. We open up the |
| file temporarily, then close it when we are done. */ |
| tmp_bfd = bfd_openr (name, gnutarget); |
| if (tmp_bfd == NULL) |
| { |
| perror_with_name (name); |
| return; |
| } |
| |
| if (!bfd_check_format (tmp_bfd, bfd_object)) |
| { |
| bfd_close (tmp_bfd); |
| error ("\"%s\" is not an object file: %s", name, |
| bfd_errmsg (bfd_get_error ())); |
| } |
| |
| |
| /* Undo some braindamage from symfile.c. |
| |
| First, symfile.c will subtract the VMA of the first .text section |
| in the shared library that it finds. Undo that. */ |
| sec = bfd_get_section_by_name (tmp_bfd, ".text"); |
| text_addr += bfd_section_vma (tmp_bfd, sec); |
| |
| /* Now find the true lowest section in the shared library. */ |
| sec = NULL; |
| bfd_map_over_sections (tmp_bfd, find_lowest_section, &sec); |
| |
| if (sec) |
| { |
| /* Subtract out the VMA of the lowest section. */ |
| text_addr -= bfd_section_vma (tmp_bfd, sec); |
| |
| /* ??? Add back in the filepos of that lowest section. */ |
| text_addr += sec->filepos; |
| } |
| |
| section_addrs = alloc_section_addr_info (bfd_count_sections (tmp_bfd)); |
| my_cleanups = make_cleanup (xfree, section_addrs); |
| |
| /* We are done with the temporary bfd. Get rid of it and make sure |
| nobody else can us it. */ |
| bfd_close (tmp_bfd); |
| tmp_bfd = NULL; |
| |
| /* Now let the generic code load up symbols for this library. */ |
| section_addrs->other[0].addr = text_addr; |
| section_addrs->other[0].name = ".text"; |
| so->objfile = symbol_file_add (name, from_tty, section_addrs, 0, OBJF_SHARED); |
| so->abfd = so->objfile->obfd; |
| |
| /* Mark this as a shared library and save private data. */ |
| so->objfile->flags |= OBJF_SHARED; |
| |
| if (so->objfile->obj_private == NULL) |
| { |
| obj_private = (obj_private_data_t *) |
| obstack_alloc (&so->objfile->psymbol_obstack, |
| sizeof (obj_private_data_t)); |
| obj_private->unwind_info = NULL; |
| obj_private->so_info = NULL; |
| so->objfile->obj_private = obj_private; |
| } |
| |
| obj_private = (obj_private_data_t *) so->objfile->obj_private; |
| obj_private->so_info = so; |
| obj_private->dp = so->pa64_solib_desc.linkage_ptr; |
| do_cleanups (my_cleanups); |
| } |
| |
| /* Load debugging information for a shared library. TARGET may be |
| NULL if we are not attaching to a process or reading a core file. */ |
| |
| static void |
| pa64_solib_load_symbols (struct so_list *so, char *name, int from_tty, |
| CORE_ADDR text_addr, struct target_ops *target) |
| { |
| struct section_table *p; |
| asection *sec; |
| int status; |
| char buf[4]; |
| CORE_ADDR presumed_data_start; |
| |
| if (text_addr == 0) |
| text_addr = so->pa64_solib_desc.text_base; |
| |
| pa64_solib_add_solib_objfile (so, name, from_tty, text_addr); |
| |
| /* Now we need to build a section table for this library since |
| we might be debugging a core file from a dynamically linked |
| executable in which the libraries were not privately mapped. */ |
| if (build_section_table (so->abfd, |
| &so->sections, |
| &so->sections_end)) |
| { |
| error ("Unable to build section table for shared library\n."); |
| return; |
| } |
| |
| (so->objfile->section_offsets)->offsets[SECT_OFF_TEXT (so->objfile)] |
| = so->pa64_solib_desc.text_base; |
| (so->objfile->section_offsets)->offsets[SECT_OFF_DATA (so->objfile)] |
| = so->pa64_solib_desc.data_base; |
| |
| /* Relocate all the sections based on where they got loaded. */ |
| for (p = so->sections; p < so->sections_end; p++) |
| { |
| if (p->the_bfd_section->flags & SEC_CODE) |
| { |
| p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT (so->objfile)); |
| p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT (so->objfile)); |
| } |
| else if (p->the_bfd_section->flags & SEC_DATA) |
| { |
| p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA (so->objfile)); |
| p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA (so->objfile)); |
| } |
| } |
| |
| /* Now see if we need to map in the text and data for this shared |
| library (for example debugging a core file which does not use |
| private shared libraries.). |
| |
| Carefully peek at the first text address in the library. If the |
| read succeeds, then the libraries were privately mapped and were |
| included in the core dump file. |
| |
| If the peek failed, then the libraries were not privately mapped |
| and are not in the core file, we'll have to read them in ourselves. */ |
| status = target_read_memory (text_addr, buf, 4); |
| if (status != 0) |
| { |
| int new, old; |
| |
| new = so->sections_end - so->sections; |
| |
| old = target_resize_to_sections (target, new); |
| |
| /* Copy over the old data before it gets clobbered. */ |
| memcpy ((char *) (target->to_sections + old), |
| so->sections, |
| ((sizeof (struct section_table)) * new)); |
| } |
| } |
| |
| |
| /* Add symbols from shared libraries into the symtab list, unless the |
| size threshold specified by auto_solib_limit (in megabytes) would |
| be exceeded. */ |
| |
| void |
| pa64_solib_add (char *arg_string, int from_tty, struct target_ops *target, int readsyms) |
| { |
| struct minimal_symbol *msymbol; |
| CORE_ADDR addr; |
| asection *shlib_info; |
| int status; |
| unsigned int dld_flags; |
| char buf[4], *re_err; |
| int threshold_warning_given = 0; |
| int dll_index; |
| struct load_module_desc dll_desc; |
| char *dll_path; |
| |
| /* First validate our arguments. */ |
| if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
| { |
| error ("Invalid regexp: %s", re_err); |
| } |
| |
| /* If we're debugging a core file, or have attached to a running |
| process, then pa64_solib_create_inferior_hook will not have been |
| called. |
| |
| We need to first determine if we're dealing with a dynamically |
| linked executable. If not, then return without an error or warning. |
| |
| We also need to examine __dld_flags to determine if the shared library |
| list is valid and to determine if the libraries have been privately |
| mapped. */ |
| if (symfile_objfile == NULL) |
| return; |
| |
| /* First see if the objfile was dynamically linked. */ |
| shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); |
| if (!shlib_info) |
| return; |
| |
| /* It's got a .dynamic section, make sure it's not empty. */ |
| if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) |
| return; |
| |
| /* Read in the load map pointer if we have not done so already. */ |
| if (! dld_cache.have_read_dld_descriptor) |
| if (! read_dld_descriptor (target, readsyms)) |
| return; |
| |
| /* If the libraries were not mapped private, warn the user. */ |
| if ((dld_cache.dld_flags & DT_HP_DEBUG_PRIVATE) == 0) |
| warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n"); |
| |
| /* For each shaerd library, add it to the shared library list. */ |
| for (dll_index = 1; ; dll_index++) |
| { |
| /* Read in the load module descriptor. */ |
| if (dlgetmodinfo (dll_index, &dll_desc, sizeof (dll_desc), |
| pa64_target_read_memory, 0, dld_cache.load_map) |
| == 0) |
| return; |
| |
| /* Get the name of the shared library. */ |
| dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc), |
| pa64_target_read_memory, |
| 0, dld_cache.load_map); |
| |
| if (!dll_path) |
| error ("pa64_solib_add, unable to read shared library path."); |
| |
| add_to_solist (from_tty, dll_path, readsyms, &dll_desc, 0, target); |
| } |
| } |
| |
| |
| /* This hook gets called just before the first instruction in the |
| inferior process is executed. |
| |
| This is our opportunity to set magic flags in the inferior so |
| that GDB can be notified when a shared library is mapped in and |
| to tell the dynamic linker that a private copy of the library is |
| needed (so GDB can set breakpoints in the library). |
| |
| We need to set two flag bits in this routine. |
| |
| DT_HP_DEBUG_PRIVATE to indicate that shared libraries should be |
| mapped private. |
| |
| DT_HP_DEBUG_CALLBACK to indicate that we want the dynamic linker to |
| call the breakpoint routine for significant events. */ |
| |
| void |
| pa64_solib_create_inferior_hook (void) |
| { |
| struct minimal_symbol *msymbol; |
| unsigned int dld_flags, status; |
| asection *shlib_info, *interp_sect; |
| char buf[4]; |
| struct objfile *objfile; |
| CORE_ADDR anaddr; |
| |
| /* First, remove all the solib event breakpoints. Their addresses |
| may have changed since the last time we ran the program. */ |
| remove_solib_event_breakpoints (); |
| |
| if (symfile_objfile == NULL) |
| return; |
| |
| /* First see if the objfile was dynamically linked. */ |
| shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); |
| if (!shlib_info) |
| return; |
| |
| /* It's got a .dynamic section, make sure it's not empty. */ |
| if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) |
| return; |
| |
| /* Read in the .dynamic section. */ |
| if (! read_dynamic_info (shlib_info, &dld_cache)) |
| error ("Unable to read the .dynamic section."); |
| |
| /* Turn on the flags we care about. */ |
| dld_cache.dld_flags |= DT_HP_DEBUG_PRIVATE; |
| dld_cache.dld_flags |= DT_HP_DEBUG_CALLBACK; |
| status = target_write_memory (dld_cache.dld_flags_addr, |
| (char *) &dld_cache.dld_flags, |
| sizeof (dld_cache.dld_flags)); |
| if (status != 0) |
| error ("Unable to modify dynamic linker flags."); |
| |
| /* Now we have to create a shared library breakpoint in the dynamic |
| linker. This can be somewhat tricky since the symbol is inside |
| the dynamic linker (for which we do not have symbols or a base |
| load address! Luckily I wrote this code for solib.c years ago. */ |
| 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 get_out; |
| |
| /* 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 get_out; |
| } |
| |
| /* 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. |
| |
| Also note the breakpoint is the second instruction in the |
| routine. */ |
| load_addr = read_pc () - tmp_bfd->start_address; |
| sym_addr = bfd_lookup_symbol (tmp_bfd, "__dld_break"); |
| sym_addr = load_addr + sym_addr + 4; |
| |
| /* Create the shared library breakpoint. */ |
| { |
| struct breakpoint *b |
| = create_solib_event_breakpoint (sym_addr); |
| |
| /* The breakpoint is actually hard-coded into the dynamic linker, |
| so we don't need to actually insert a breakpoint instruction |
| there. In fact, the dynamic linker's code is immutable, even to |
| ttrace, so we shouldn't even try to do that. For cases like |
| this, we have "permanent" breakpoints. */ |
| make_breakpoint_permanent (b); |
| } |
| |
| /* We're done with the temporary bfd. */ |
| bfd_close (tmp_bfd); |
| } |
| |
| get_out: |
| /* Wipe out all knowledge of old shared libraries since their |
| mapping can change from one exec to another! */ |
| while (so_list_head) |
| { |
| struct so_list *temp; |
| |
| temp = so_list_head; |
| xfree (so_list_head); |
| so_list_head = temp->next; |
| } |
| clear_symtab_users (); |
| } |
| |
| /* This operation removes the "hook" between GDB and the dynamic linker, |
| which causes the dld to notify GDB of shared library events. |
| |
| After this operation completes, the dld will no longer notify GDB of |
| shared library events. To resume notifications, GDB must call |
| pa64_solib_create_inferior_hook. |
| |
| This operation does not remove any knowledge of shared libraries which |
| GDB may already have been notified of. */ |
| |
| void |
| pa64_solib_remove_inferior_hook (int pid) |
| { |
| /* Turn off the DT_HP_DEBUG_CALLBACK bit in the dynamic linker flags. */ |
| dld_cache.dld_flags &= ~DT_HP_DEBUG_CALLBACK; |
| target_write_memory (dld_cache.dld_flags_addr, |
| (char *)&dld_cache.dld_flags, |
| sizeof (dld_cache.dld_flags)); |
| } |
| |
| /* This function creates a breakpoint on the dynamic linker hook, which |
| is called when e.g., a shl_load or shl_unload call is made. This |
| breakpoint will only trigger when a shl_load call is made. |
| |
| If filename is NULL, then loads of any dll will be caught. Else, |
| only loads of the file whose pathname is the string contained by |
| filename will be caught. |
| |
| Undefined behaviour is guaranteed if this function is called before |
| pa64_solib_create_inferior_hook. */ |
| |
| void |
| pa64_solib_create_catch_load_hook (int pid, int tempflag, char *filename, |
| char *cond_string) |
| { |
| create_solib_load_event_breakpoint ("", tempflag, filename, cond_string); |
| } |
| |
| /* This function creates a breakpoint on the dynamic linker hook, which |
| is called when e.g., a shl_load or shl_unload call is made. This |
| breakpoint will only trigger when a shl_unload call is made. |
| |
| If filename is NULL, then unloads of any dll will be caught. Else, |
| only unloads of the file whose pathname is the string contained by |
| filename will be caught. |
| |
| Undefined behaviour is guaranteed if this function is called before |
| pa64_solib_create_inferior_hook. */ |
| |
| void |
| pa64_solib_create_catch_unload_hook (int pid, int tempflag, char *filename, |
| char *cond_string) |
| { |
| create_solib_unload_event_breakpoint ("", tempflag, filename, cond_string); |
| } |
| |
| /* Return nonzero if the dynamic linker has reproted that a library |
| has been loaded. */ |
| |
| int |
| pa64_solib_have_load_event (int pid) |
| { |
| CORE_ADDR event_kind; |
| |
| event_kind = read_register (ARG0_REGNUM); |
| return (event_kind == DLD_CB_LOAD); |
| } |
| |
| /* Return nonzero if the dynamic linker has reproted that a library |
| has been unloaded. */ |
| int |
| pa64_solib_have_unload_event (int pid) |
| { |
| CORE_ADDR event_kind; |
| |
| event_kind = read_register (ARG0_REGNUM); |
| return (event_kind == DLD_CB_UNLOAD); |
| } |
| |
| /* Return a pointer to a string indicating the pathname of the most |
| recently loaded library. |
| |
| The caller is reposible for copying the string before the inferior is |
| restarted. */ |
| |
| char * |
| pa64_solib_loaded_library_pathname (int pid) |
| { |
| static char dll_path[MAXPATHLEN]; |
| CORE_ADDR dll_path_addr = read_register (ARG3_REGNUM); |
| read_memory_string (dll_path_addr, dll_path, MAXPATHLEN); |
| return dll_path; |
| } |
| |
| /* Return a pointer to a string indicating the pathname of the most |
| recently unloaded library. |
| |
| The caller is reposible for copying the string before the inferior is |
| restarted. */ |
| |
| char * |
| pa64_solib_unloaded_library_pathname (int pid) |
| { |
| static char dll_path[MAXPATHLEN]; |
| CORE_ADDR dll_path_addr = read_register (ARG3_REGNUM); |
| read_memory_string (dll_path_addr, dll_path, MAXPATHLEN); |
| return dll_path; |
| } |
| |
| /* Return nonzero if PC is an address inside the dynamic linker. */ |
| |
| int |
| pa64_solib_in_dynamic_linker (int pid, CORE_ADDR pc) |
| { |
| asection *shlib_info; |
| |
| if (symfile_objfile == NULL) |
| return 0; |
| |
| if (!dld_cache.have_read_dld_descriptor) |
| if (!read_dld_descriptor (¤t_target, auto_solib_add)) |
| return 0; |
| |
| return (pc >= dld_cache.dld_desc.text_base |
| && pc < dld_cache.dld_desc.text_base + dld_cache.dld_desc.text_size); |
| } |
| |
| |
| /* Return the GOT value for the shared library in which ADDR belongs. If |
| ADDR isn't in any known shared library, return zero. */ |
| |
| CORE_ADDR |
| pa64_solib_get_got_by_pc (CORE_ADDR addr) |
| { |
| struct so_list *so_list = so_list_head; |
| CORE_ADDR got_value = 0; |
| |
| while (so_list) |
| { |
| if (so_list->pa64_solib_desc.text_base <= addr |
| && ((so_list->pa64_solib_desc.text_base |
| + so_list->pa64_solib_desc.text_size) |
| > addr)) |
| { |
| got_value = so_list->pa64_solib_desc.linkage_ptr; |
| break; |
| } |
| so_list = so_list->next; |
| } |
| return got_value; |
| } |
| |
| /* Return the address of the handle of the shared library in which ADDR |
| belongs. If ADDR isn't in any known shared library, return zero. |
| |
| This function is used in hppa_fix_call_dummy in hppa-tdep.c. */ |
| |
| CORE_ADDR |
| pa64_solib_get_solib_by_pc (CORE_ADDR addr) |
| { |
| struct so_list *so_list = so_list_head; |
| CORE_ADDR retval = 0; |
| |
| while (so_list) |
| { |
| if (so_list->pa64_solib_desc.text_base <= addr |
| && ((so_list->pa64_solib_desc.text_base |
| + so_list->pa64_solib_desc.text_size) |
| > addr)) |
| { |
| retval = so_list->pa64_solib_desc_addr; |
| break; |
| } |
| so_list = so_list->next; |
| } |
| return retval; |
| } |
| |
| /* Dump information about all the currently loaded shared libraries. */ |
| |
| static void |
| pa64_sharedlibrary_info_command (char *ignore, int from_tty) |
| { |
| struct so_list *so_list = so_list_head; |
| |
| if (exec_bfd == NULL) |
| { |
| printf_unfiltered ("No executable file.\n"); |
| return; |
| } |
| |
| if (so_list == NULL) |
| { |
| printf_unfiltered ("No shared libraries loaded at this time.\n"); |
| return; |
| } |
| |
| printf_unfiltered ("Shared Object Libraries\n"); |
| printf_unfiltered (" %-19s%-19s%-19s%-19s\n", |
| " text start", " text end", |
| " data start", " data end"); |
| while (so_list) |
| { |
| unsigned int flags; |
| |
| printf_unfiltered ("%s", so_list->name); |
| if (so_list->objfile == NULL) |
| printf_unfiltered (" (symbols not loaded)"); |
| if (so_list->loaded == 0) |
| printf_unfiltered (" (shared library unloaded)"); |
| printf_unfiltered (" %-18s", |
| local_hex_string_custom (so_list->pa64_solib_desc.linkage_ptr, |
| "016l")); |
| printf_unfiltered ("\n"); |
| printf_unfiltered ("%-18s", |
| local_hex_string_custom (so_list->pa64_solib_desc.text_base, |
| "016l")); |
| printf_unfiltered (" %-18s", |
| local_hex_string_custom ((so_list->pa64_solib_desc.text_base |
| + so_list->pa64_solib_desc.text_size), |
| "016l")); |
| printf_unfiltered (" %-18s", |
| local_hex_string_custom (so_list->pa64_solib_desc.data_base, |
| "016l")); |
| printf_unfiltered (" %-18s\n", |
| local_hex_string_custom ((so_list->pa64_solib_desc.data_base |
| + so_list->pa64_solib_desc.data_size), |
| "016l")); |
| so_list = so_list->next; |
| } |
| } |
| |
| /* Load up one or more shared libraries as directed by the user. */ |
| |
| static void |
| pa64_solib_sharedlibrary_command (char *args, int from_tty) |
| { |
| dont_repeat (); |
| pa64_solib_add (args, from_tty, (struct target_ops *) 0, 1); |
| } |
| |
| /* Return the name of the shared library containing ADDR or NULL if ADDR |
| is not contained in any known shared library. */ |
| |
| char * |
| pa64_solib_address (CORE_ADDR addr) |
| { |
| struct so_list *so = so_list_head; |
| |
| while (so) |
| { |
| /* Is this address within this shlib's text range? If so, |
| return the shlib's name. */ |
| if (addr >= so->pa64_solib_desc.text_base |
| && addr < (so->pa64_solib_desc.text_base |
| | so->pa64_solib_desc.text_size)) |
| return so->name; |
| |
| /* Nope, keep looking... */ |
| so = so->next; |
| } |
| |
| /* No, we couldn't prove that the address is within a shlib. */ |
| return NULL; |
| } |
| |
| /* We are killing the inferior and restarting the program. */ |
| |
| void |
| pa64_solib_restart (void) |
| { |
| struct so_list *sl = so_list_head; |
| |
| /* Before the shlib info vanishes, use it to disable any breakpoints |
| that may still be active in those shlibs. */ |
| disable_breakpoints_in_shlibs (0); |
| |
| /* Discard all the shlib descriptors. */ |
| while (sl) |
| { |
| struct so_list *next_sl = sl->next; |
| xfree (sl); |
| sl = next_sl; |
| } |
| so_list_head = NULL; |
| |
| pa64_solib_total_st_size = (LONGEST) 0; |
| pa64_solib_st_size_threshold_exceeded = 0; |
| |
| dld_cache.is_valid = 0; |
| dld_cache.have_read_dld_descriptor = 0; |
| dld_cache.dld_flags_addr = 0; |
| dld_cache.load_map = 0; |
| dld_cache.load_map_addr = 0; |
| dld_cache.dld_desc.data_base = 0; |
| dld_cache.dld_flags = 0; |
| dld_cache.dyninfo_sect = 0; |
| } |
| |
| void |
| _initialize_pa64_solib (void) |
| { |
| add_com ("sharedlibrary", class_files, pa64_solib_sharedlibrary_command, |
| "Load shared object library symbols for files matching REGEXP."); |
| add_info ("sharedlibrary", pa64_sharedlibrary_info_command, |
| "Status of loaded shared object libraries."); |
| |
| add_show_from_set |
| (add_set_cmd ("auto-solib-add", class_support, var_boolean, |
| (char *) &auto_solib_add, |
| "Set autoloading of shared library symbols.\n\ |
| If \"on\", symbols from all shared object libraries will be loaded\n\ |
| automatically when the inferior begins execution, when the dynamic linker\n\ |
| informs gdb that a new library has been loaded, or when attaching to the\n\ |
| inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'.", |
| &setlist), |
| &showlist); |
| |
| add_show_from_set |
| (add_set_cmd ("auto-solib-limit", class_support, var_zinteger, |
| (char *) &auto_solib_limit, |
| "Set threshold (in Mb) for autoloading shared library symbols.\n\ |
| When shared library autoloading is enabled, new libraries will be loaded\n\ |
| only until the total size of shared library symbols exceeds this\n\ |
| threshold in megabytes. Is ignored when using `sharedlibrary'.", |
| &setlist), |
| &showlist); |
| |
| /* ??rehrauer: On HP-UX, the kernel parameter MAXDSIZ limits how |
| much data space a process can use. We ought to be reading |
| MAXDSIZ and setting auto_solib_limit to some large fraction of |
| that value. If not that, we maybe ought to be setting it smaller |
| than the default for MAXDSIZ (that being 64Mb, I believe). |
| However, [1] this threshold is only crudely approximated rather |
| than actually measured, and [2] 50 Mbytes is too small for |
| debugging gdb itself. Thus, the arbitrary 100 figure. */ |
| auto_solib_limit = 100; /* Megabytes */ |
| |
| pa64_solib_restart (); |
| } |
| |
| /* Get some HPUX-specific data from a shared lib. */ |
| CORE_ADDR |
| so_lib_thread_start_addr (struct so_list *so) |
| { |
| return so->pa64_solib_desc.tls_start_addr; |
| } |
| |
| /* Read the dynamic linker's internal shared library descriptor. |
| |
| This must happen after dld starts running, so we can't do it in |
| read_dynamic_info. Record the fact that we have loaded the |
| descriptor. If the library is archive bound, then return zero, else |
| return nonzero. */ |
| |
| static int |
| read_dld_descriptor (struct target_ops *target, int readsyms) |
| { |
| char *dll_path; |
| asection *dyninfo_sect; |
| |
| /* If necessary call read_dynamic_info to extract the contents of the |
| .dynamic section from the shared library. */ |
| if (!dld_cache.is_valid) |
| { |
| if (symfile_objfile == NULL) |
| error ("No object file symbols."); |
| |
| dyninfo_sect = bfd_get_section_by_name (symfile_objfile->obfd, |
| ".dynamic"); |
| if (!dyninfo_sect) |
| { |
| return 0; |
| } |
| |
| if (!read_dynamic_info (dyninfo_sect, &dld_cache)) |
| error ("Unable to read in .dynamic section information."); |
| } |
| |
| /* Read the load map pointer. */ |
| if (target_read_memory (dld_cache.load_map_addr, |
| (char*) &dld_cache.load_map, |
| sizeof(dld_cache.load_map)) |
| != 0) |
| { |
| error ("Error while reading in load map pointer."); |
| } |
| |
| /* Read in the dld load module descriptor */ |
| if (dlgetmodinfo (-1, |
| &dld_cache.dld_desc, |
| sizeof(dld_cache.dld_desc), |
| pa64_target_read_memory, |
| 0, |
| dld_cache.load_map) |
| == 0) |
| { |
| error ("Error trying to get information about dynamic linker."); |
| } |
| |
| /* Indicate that we have loaded the dld descriptor. */ |
| dld_cache.have_read_dld_descriptor = 1; |
| |
| /* Add dld.sl to the list of known shared libraries so that we can |
| do unwind, etc. |
| |
| ?!? This may not be correct. Consider of dld.sl contains symbols |
| which are also referenced/defined by the user program or some user |
| shared library. We need to make absolutely sure that we do not |
| pollute the namespace from GDB's point of view. */ |
| dll_path = dlgetname (&dld_cache.dld_desc, |
| sizeof(dld_cache.dld_desc), |
| pa64_target_read_memory, |
| 0, |
| dld_cache.load_map); |
| add_to_solist(0, dll_path, readsyms, &dld_cache.dld_desc, 0, target); |
| |
| return 1; |
| } |
| |
| /* Read the .dynamic section and extract the information of interest, |
| which is stored in dld_cache. The routine elf_locate_base in solib.c |
| was used as a model for this. */ |
| |
| static int |
| read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p) |
| { |
| char *buf; |
| char *bufend; |
| CORE_ADDR dyninfo_addr; |
| int dyninfo_sect_size; |
| CORE_ADDR entry_addr; |
| |
| /* Read in .dynamic section, silently ignore errors. */ |
| dyninfo_addr = bfd_section_vma (symfile_objfile->obfd, dyninfo_sect); |
| 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; |
| |
| /* Scan the .dynamic section and record the items of interest. |
| In particular, DT_HP_DLD_FLAGS */ |
| for (bufend = buf + dyninfo_sect_size, entry_addr = dyninfo_addr; |
| buf < bufend; |
| buf += sizeof (Elf64_Dyn), entry_addr += sizeof (Elf64_Dyn)) |
| { |
| Elf64_Dyn *x_dynp = (Elf64_Dyn*)buf; |
| Elf64_Sxword dyn_tag; |
| CORE_ADDR dyn_ptr; |
| char *pbuf; |
| |
| pbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT); |
| dyn_tag = bfd_h_get_64 (symfile_objfile->obfd, |
| (bfd_byte*) &x_dynp->d_tag); |
| |
| /* We can't use a switch here because dyn_tag is 64 bits and HP's |
| lame comiler does not handle 64bit items in switch statements. */ |
| if (dyn_tag == DT_NULL) |
| break; |
| else if (dyn_tag == DT_HP_DLD_FLAGS) |
| { |
| /* Set dld_flags_addr and dld_flags in *dld_cache_p */ |
| dld_cache_p->dld_flags_addr = entry_addr + offsetof(Elf64_Dyn, d_un); |
| if (target_read_memory (dld_cache_p->dld_flags_addr, |
| (char*) &dld_cache_p->dld_flags, |
| sizeof(dld_cache_p->dld_flags)) |
| != 0) |
| { |
| error ("Error while reading in .dynamic section of the program."); |
| } |
| } |
| else if (dyn_tag == DT_HP_LOAD_MAP) |
| { |
| /* Dld will place the address of the load map at load_map_addr |
| after it starts running. */ |
| if (target_read_memory (entry_addr + offsetof(Elf64_Dyn, |
| d_un.d_ptr), |
| (char*) &dld_cache_p->load_map_addr, |
| sizeof(dld_cache_p->load_map_addr)) |
| != 0) |
| { |
| error ("Error while reading in .dynamic section of the program."); |
| } |
| } |
| else |
| { |
| /* tag is not of interest */ |
| } |
| } |
| |
| /* Record other information and set is_valid to 1. */ |
| dld_cache_p->dyninfo_sect = dyninfo_sect; |
| |
| /* Verify that we read in required info. These fields are re-set to zero |
| in pa64_solib_restart. */ |
| |
| if (dld_cache_p->dld_flags_addr != 0 && dld_cache_p->load_map_addr != 0) |
| dld_cache_p->is_valid = 1; |
| else |
| return 0; |
| |
| return 1; |
| } |
| |
| /* Wrapper for target_read_memory to make dlgetmodinfo happy. */ |
| |
| static void * |
| pa64_target_read_memory (void *buffer, CORE_ADDR ptr, size_t bufsiz, int ident) |
| { |
| if (target_read_memory (ptr, buffer, bufsiz) != 0) |
| return 0; |
| return buffer; |
| } |
| |
| /* Called from handle_dynlink_load_event and pa64_solib_add to add |
| a shared library to so_list_head list and possibly to read in the |
| debug information for the library. |
| |
| If load_module_desc_p is NULL, then the load module descriptor must |
| be read from the inferior process at the address load_module_desc_addr. */ |
| |
| static void |
| add_to_solist (int from_tty, char *dll_path, int readsyms, |
| struct load_module_desc *load_module_desc_p, |
| CORE_ADDR load_module_desc_addr, struct target_ops *target) |
| { |
| struct so_list *new_so, *so_list_tail; |
| int pa64_solib_st_size_threshhold_exceeded; |
| LONGEST st_size; |
| |
| if (symfile_objfile == NULL) |
| return; |
| |
| so_list_tail = so_list_head; |
| /* Find the end of the list of shared objects. */ |
| while (so_list_tail && so_list_tail->next) |
| { |
| if (strcmp (so_list_tail->name, dll_path) == 0) |
| return; |
| so_list_tail = so_list_tail->next; |
| } |
| |
| if (so_list_tail && strcmp (so_list_tail->name, dll_path) == 0) |
| return; |
| |
| /* Add the shared library to the so_list_head list */ |
| new_so = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| memset ((char *)new_so, 0, sizeof (struct so_list)); |
| if (so_list_head == NULL) |
| { |
| so_list_head = new_so; |
| so_list_tail = new_so; |
| } |
| else |
| { |
| so_list_tail->next = new_so; |
| so_list_tail = new_so; |
| } |
| |
| /* Initialize the new_so */ |
| if (load_module_desc_p) |
| { |
| new_so->pa64_solib_desc = *load_module_desc_p; |
| } |
| else |
| { |
| if (target_read_memory (load_module_desc_addr, |
| (char*) &new_so->pa64_solib_desc, |
| sizeof(struct load_module_desc)) |
| != 0) |
| { |
| error ("Error while reading in dynamic library %s", dll_path); |
| } |
| } |
| |
| new_so->pa64_solib_desc_addr = load_module_desc_addr; |
| new_so->loaded = 1; |
| new_so->name = obsavestring (dll_path, strlen(dll_path), |
| &symfile_objfile->symbol_obstack); |
| |
| /* If we are not going to load the library, tell the user if we |
| haven't already and return. */ |
| |
| st_size = pa64_solib_sizeof_symbol_table (dll_path); |
| pa64_solib_st_size_threshhold_exceeded = |
| !from_tty |
| && readsyms |
| && ( (st_size + pa64_solib_total_st_size) |
| > (auto_solib_limit * (LONGEST) (1024 * 1024))); |
| if (pa64_solib_st_size_threshhold_exceeded) |
| { |
| pa64_solib_add_solib_objfile (new_so, dll_path, from_tty, 1); |
| return; |
| } |
| |
| /* Now read in debug info. */ |
| pa64_solib_total_st_size += st_size; |
| |
| /* This fills in new_so->objfile, among others. */ |
| pa64_solib_load_symbols (new_so, |
| dll_path, |
| from_tty, |
| 0, |
| target); |
| return; |
| } |
| |
| |
| /* |
| 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 (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 (xfree, symbol_table); |
| number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
| |
| for (i = 0; i < number_of_symbols; i++) |
| { |
| sym = *symbol_table++; |
| if (strcmp (sym->name, symname) == 0) |
| { |
| /* Bfd symbols are section relative. */ |
| symaddr = sym->value + sym->section->vma; |
| break; |
| } |
| } |
| do_cleanups (back_to); |
| } |
| return (symaddr); |
| } |
| |