+++ /dev/null
-/* Handle HP ELF shared libraries for GDB, the GNU Debugger.
-
- Copyright 1999, 2000, 2001, 2002, 2003, 2004 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 "hppa-tdep.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"), OPF_TRY_CWD_FIRST, 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;
- struct hppa_objfile_private *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;
-
- obj_private = (struct hppa_objfile_private *)
- objfile_data (so->objfile, hppa_objfile_priv_data);
- if (obj_private == NULL)
- {
- obj_private = (struct hppa_objfile_private *)
- obstack_alloc (&so->objfile->objfile_obstack,
- sizeof (struct hppa_objfile_private));
- set_objfile_data (so->objfile, hppa_objfile_priv_data, obj_private);
- obj_private->unwind_info = NULL;
- obj_private->so_info = NULL;
- }
-
- 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\n\
-breakpoint in a shared library will not work until you rerun the program."));
-
- /* 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
- of which GDB may already have been notified. */
-
-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 (HPPA_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 (HPPA_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 (HPPA_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 (HPPA_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",
- hex_string_custom (so_list->pa64_solib_desc.linkage_ptr, 16));
- printf_unfiltered ("\n");
- printf_unfiltered ("%-18s",
- hex_string_custom (so_list->pa64_solib_desc.text_base, 16));
- printf_unfiltered (" %-18s",
- hex_string_custom ((so_list->pa64_solib_desc.text_base
- + so_list->pa64_solib_desc.text_size), 16));
- printf_unfiltered (" %-18s",
- hex_string_custom (so_list->pa64_solib_desc.data_base, 16));
- printf_unfiltered (" %-18s\n",
- hex_string_custom ((so_list->pa64_solib_desc.data_base
- + so_list->pa64_solib_desc.data_size), 16));
- 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_setshow_boolean_cmd ("auto-solib-add", class_support,
- &auto_solib_add, _("\
-Set autoloading of shared library symbols."), _("\
-Show autoloading of shared library symbols."), _("\
-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'."),
- NULL,
- NULL, /* FIXME: i18n: */
- &setlist, &showlist);
-
- add_setshow_zinteger_cmd ("auto-solib-limit", class_support,
- &auto_solib_limit, _("\
-Set threshold (in Mb) for autoloading shared library symbols."), _("\
-Show threshold (in Mb) for autoloading shared library symbols."), _("\
-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'."),
- NULL,
- NULL, /* FIXME: i18n: */
- &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
-pa64_solib_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->objfile_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);
-}
-
projects / binutils-gdb.git / commitdiff