--- /dev/null
+/* Handle HP ELF shared libraries for GDB, the GNU Debugger.
+ Copyright 1999 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 "assert.h"
+#include "language.h"
+
+#include <fcntl.h>
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+/* Defined in exec.c; used to prevent dangling pointer bug. */
+extern struct target_ops exec_ops;
+
+static CORE_ADDR
+ bfd_lookup_symbol PARAMS ((bfd *, char *));
+/* This lives in hppa-tdep.c. */
+extern struct unwind_table_entry *find_unwind_entry PARAMS ((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;
+ boolean 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 the threshold size, held by auto_solib_add
+ (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,
+ smalller 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;
+ long long dld_flags;
+ sec_ptr dyninfo_sect;
+ boolean have_read_dld_descriptor;
+ boolean 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 PARAMS ((char *, int));
+
+static void pa64_solib_sharedlibrary_command PARAMS ((char *, int));
+
+static void * pa64_target_read_memory PARAMS ((void *, CORE_ADDR, size_t, int));
+
+static boolean read_dld_descriptor PARAMS ((struct target_ops *));
+
+static boolean read_dynamic_info PARAMS ((asection *, dld_cache_t *));
+
+static void add_to_solist PARAMS ((boolean, char *, 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 (filename)
+ 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 (free, 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 (free, 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);
+ free (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 (so, name, from_tty, text_addr)
+ struct so_list *so;
+ char *name;
+ int from_tty;
+ CORE_ADDR text_addr;
+{
+ bfd *tmp_bfd;
+ asection *sec;
+ obj_private_data_t *obj_private;
+
+ /* 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, (PTR) &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;
+ }
+
+ /* 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. */
+ so->objfile = symbol_file_add (name, from_tty, text_addr, 0, 0, 0, 0, 1);
+ 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 = (PTR) 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;
+}
+
+/* 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 (so, name, from_tty, text_addr, target)
+ 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;
+ }
+
+ ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT)
+ = so->pa64_solib_desc.text_base;
+ ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA)
+ = 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);
+ p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_TEXT);
+ }
+ else if (p->the_bfd_section->flags & SEC_DATA)
+ {
+ p->addr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA);
+ p->endaddr += ANOFFSET (so->objfile->section_offsets, SECT_OFF_DATA);
+ }
+ }
+
+ /* 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 old, new;
+ int update_coreops;
+ int update_execops;
+
+ /* 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;
+
+ /* Ditto exec_ops (this was a bug). */
+ update_execops = exec_ops.to_sections == target->to_sections;
+
+ new = so->sections_end - so->sections;
+ /* Add sections from the shared library to the core target. */
+ 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)) * (old + new)));
+ }
+ else
+ {
+ old = 0;
+ target->to_sections = (struct section_table *)
+ xmalloc ((sizeof (struct section_table)) * new);
+ }
+ target->to_sections_end = (target->to_sections + old + new);
+
+ /* Update the to_sections field in the core_ops structure
+ if needed, ditto exec_ops. */
+ if (update_coreops)
+ {
+ core_ops.to_sections = target->to_sections;
+ core_ops.to_sections_end = target->to_sections_end;
+ }
+
+ if (update_execops)
+ {
+ exec_ops.to_sections = target->to_sections;
+ exec_ops.to_sections_end = target->to_sections_end;
+ }
+
+ /* 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_add, in megabytes) would
+ be exceeded. */
+
+void
+pa64_solib_add (arg_string, from_tty, target)
+ char *arg_string;
+ int from_tty;
+ struct target_ops *target;
+{
+ 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))
+ 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, &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 ()
+{
+ 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;
+
+ /* Slam the pid of the process into __d_pid; failing is only a warning! */
+ msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile);
+ if (msymbol == NULL)
+ {
+ warning ("Unable to find __d_pid symbol in object file.");
+ warning ("Suggest linking with /opt/langtools/lib/end.o.");
+ warning ("GDB will be unable to track explicit library load/unload calls");
+ goto keep_going;
+ }
+
+ anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
+ store_unsigned_integer (buf, 4, inferior_pid);
+ status = target_write_memory (anaddr, buf, 4);
+ if (status != 0)
+ {
+ warning ("Unable to write __d_pid");
+ warning ("Suggest linking with /opt/langtools/lib/end.o.");
+ warning ("GDB will be unable to track explicit library load/unload calls");
+ goto keep_going;
+ }
+
+keep_going:
+
+ /* 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;
+ /* ?!? Right now GDB is not recognizing hitting the callback breakpoint
+ as a shared library event. Fix that and remove the #if0 code. */
+#if 0
+ dld_cache.dld_flags |= DT_HP_DEBUG_CALLBACK;
+#endif
+ 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. */
+ create_solib_event_breakpoint (sym_addr);
+
+ /* 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;
+ free (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 (pid)
+ 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 (pid, tempflag, filename, cond_string)
+ 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 (pid, tempflag, filename, cond_string)
+ 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 (pid)
+ 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 (pid)
+ 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 (pid)
+ 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 (pid)
+ 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 (pid, pc)
+ 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))
+ 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 (addr)
+ 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 (addr)
+ 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 (ignore, from_tty)
+ char *ignore;
+ int from_tty;
+{
+ struct so_list *so_list = so_list_head;
+
+ if (exec_bfd == NULL)
+ {
+ printf_unfiltered ("no exec 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",
+ " tstart", " tend",
+ " dstart", " dend");
+ 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 (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ dont_repeat ();
+ pa64_solib_add (args, from_tty, (struct target_ops *) 0);
+}
+
+/* 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 (addr)
+ 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 ()
+{
+ 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;
+ free (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 ()
+{
+ 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_zinteger,
+ (char *) &auto_solib_add,
+ "Set autoloading size threshold (in megabytes) 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, until the symbol table\n\
+of the program and libraries exceeds this threshold.\n\
+Otherwise, symbols must be loaded manually, 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_add 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_add = 100; /* Megabytes */
+
+ pa64_solib_restart ();
+}
+
+/* Get some HPUX-specific data from a shared lib. */
+CORE_ADDR
+so_lib_thread_start_addr (so)
+ 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 boolean
+read_dld_descriptor (target)
+ struct target_ops *target;
+{
+ 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, &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 boolean
+read_dynamic_info (dyninfo_sect, dld_cache_p)
+ 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[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 (buffer, ptr, bufsiz, ident)
+ 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 (from_tty, dll_path, load_module_desc_p,
+ load_module_desc_addr, target)
+ boolean from_tty;
+ char *dll_path;
+ 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
+ && ( (st_size + pa64_solib_total_st_size)
+ > (auto_solib_add * (LONGEST)1000000));
+ 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);
+ 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 (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);
+}
+
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