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[rfc] first cut of solib-som.[ch]
- From: Randolph Chung <randolph at tausq dot org>
- To: gdb-patches at sources dot redhat dot com
- Date: Mon, 6 Dec 2004 21:24:24 -0800
- Subject: [rfc] first cut of solib-som.[ch]
- Reply-to: Randolph Chung <randolph at tausq dot org>
Here's a first cut at SOM solib support using the new solib
infrastructure. I hope this is somewhat cleaner than the original
somsolib.c. The in_dynsym_resolve_code method is still really ugly; i
hope to revisit that later. Can someone please review this and let me
know if i'm on the right track? I've done some light testing with this
using hppa2.0w-hp-hpux11.11. In some ways it works better than the
existing code (e.g. info sharedlib will segfault the current gdb in
cvs, but using this version works)
If this is ok, i'll check it in without linking it to anything. Will
work on converting pa64solib next, and once that is ready we can enable
that for hpux targets.
One interesting bit for hpux is that for hppa64-hpux, to support both
32-bit and 64-bit debugging at the same time, we will need multiarched
solib support as well. My plan is to call either som_solib_select ()
[below] or pa64_solib_select () in the osabi sniffer to set the correct
current_target_so_ops. Is that how it is supposed to work?
thanks
randolph
2004-12-06 Randolph Chung <tausq@debian.org>
* solib-som.h: New file.
* solib-som.c: New file.
--- /dev/null Tue Dec 7 00:15:15 2004
+++ solib-som.h Tue Dec 7 00:17:21 2004
@@ -0,0 +1,41 @@
+/* Handle SOM shared libraries for GDB, the GNU Debugger.
+
+ Copyright 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. */
+
+#ifndef SOLIB_SOM_H
+#define SOLIB_SOM_H
+
+struct objfile;
+struct section_offsets;
+struct so_list;
+
+void som_solib_select (void);
+
+int som_solib_section_offsets (struct objfile *objfile,
+ struct section_offsets *offsets);
+
+CORE_ADDR som_solib_get_got_by_pc (CORE_ADDR addr);
+
+CORE_ADDR som_solib_thread_start_addr (struct so_list *so);
+
+CORE_ADDR som_solib_get_solib_by_pc (CORE_ADDR addr);
+
+#endif
+
--- /dev/null Tue Dec 7 00:15:15 2004
+++ solib-som.c Mon Dec 6 23:56:47 2004
@@ -0,0 +1,903 @@
+/* Handle SOM shared libraries for GDB, the GNU Debugger.
+
+ Copyright 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. */
+
+#include "defs.h"
+#include "som.h"
+#include "symtab.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "gdbcore.h"
+#include "target.h"
+#include "inferior.h"
+
+#include "hppa-tdep.h"
+#include "solist.h"
+
+#undef SOLIB_SOM_DBG
+
+/* These ought to be defined in some public interface, but aren't. They
+ define the meaning of the various bits in the distinguished __dld_flags
+ variable that is declared in every debuggable a.out on HP-UX, and that
+ is shared between the debugger and the dynamic linker.
+ */
+#define DLD_FLAGS_MAPPRIVATE 0x1
+#define DLD_FLAGS_HOOKVALID 0x2
+#define DLD_FLAGS_LISTVALID 0x4
+#define DLD_FLAGS_BOR_ENABLE 0x8
+
+struct lm_info
+ {
+ /* Version of this structure (it is expected to change again in hpux10). */
+ unsigned char struct_version;
+
+ /* Binding mode for this library. */
+ unsigned char bind_mode;
+
+ /* Version of this library. */
+ short library_version;
+
+ /* Start of text address,
+ link-time text location (length of text area),
+ end of text address. */
+ CORE_ADDR text_addr;
+ CORE_ADDR text_link_addr;
+ CORE_ADDR text_end;
+
+ /* Start of data, start of bss and end of data. */
+ CORE_ADDR data_start;
+ CORE_ADDR bss_start;
+ CORE_ADDR data_end;
+
+ /* Value of linkage pointer (%r19). */
+ CORE_ADDR got_value;
+
+ /* Address in target of offset from thread-local register of
+ start of this thread's data. I.e., the first thread-local
+ variable in this shared library starts at *(tsd_start_addr)
+ from that area pointed to by cr27 (mpsfu_hi).
+
+ We do the indirection as soon as we read it, so from then
+ on it's the offset itself. */
+ CORE_ADDR tsd_start_addr;
+
+ /* Address of the link map entry in the loader. */
+ CORE_ADDR lm_addr;
+ };
+
+/* These addresses should be filled in by som_solib_create_inferior_hook.
+ They are also used elsewhere in this module.
+ */
+typedef struct
+ {
+ CORE_ADDR address;
+ struct unwind_table_entry *unwind;
+ }
+addr_and_unwind_t;
+
+/* When adding fields, be sure to clear them in _initialize_som_solib. */
+static struct
+ {
+ int is_valid;
+ addr_and_unwind_t hook;
+ addr_and_unwind_t hook_stub;
+ addr_and_unwind_t load;
+ addr_and_unwind_t load_stub;
+ addr_and_unwind_t unload;
+ addr_and_unwind_t unload2;
+ addr_and_unwind_t unload_stub;
+ }
+dld_cache;
+
+static void
+som_relocate_section_addresses (struct so_list *so,
+ struct section_table *sec)
+{
+ flagword aflag = bfd_get_section_flags(so->abfd, sec->the_bfd_section);
+
+ /* solib.c does something similar, but it only recognizes ".text", SOM calls
+ the text section "$CODE$". */
+ if (strcmp (sec->the_bfd_section->name, "$CODE$") == 0)
+ {
+ so->textsection = sec;
+ }
+
+ if (aflag & SEC_CODE)
+ {
+ sec->addr += so->lm_info->text_addr - so->lm_info->text_link_addr;
+ sec->endaddr += so->lm_info->text_addr - so->lm_info->text_link_addr;
+ }
+ else if (aflag & SEC_DATA)
+ {
+ sec->addr += so->lm_info->data_start;
+ sec->endaddr += so->lm_info->data_start;
+ }
+ else
+ ;
+}
+
+/* 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).
+
+ __dld_flags is the location of the magic flags; as of this implementation
+ there are 3 flags of interest:
+
+ bit 0 when set indicates that private copies of the libraries are needed
+ bit 1 when set indicates that the callback hook routine is valid
+ bit 2 when set indicates that the dynamic linker should maintain the
+ __dld_list structure when loading/unloading libraries.
+
+ Note that shared libraries are not mapped in at this time, so we have
+ run the inferior until the libraries are mapped in. Typically this
+ means running until the "_start" is called. */
+
+static void
+som_solib_create_inferior_hook (void)
+{
+ struct minimal_symbol *msymbol;
+ unsigned int dld_flags, status, have_endo;
+ asection *shlib_info;
+ 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, "$SHLIB_INFO$");
+ if (!shlib_info)
+ return;
+
+ /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */
+ if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0)
+ return;
+
+ have_endo = 0;
+ /* Slam the pid of the process into __d_pid.
+
+ We used to warn when this failed, but that warning is only useful
+ on very old HP systems (hpux9 and older). The warnings are an
+ annoyance to users of modern systems and foul up the testsuite as
+ well. As a result, the warnings have been disabled. */
+ msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile);
+ if (msymbol == NULL)
+ goto keep_going;
+
+ anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
+ store_unsigned_integer (buf, 4, PIDGET (inferior_ptid));
+ 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 shl_load/shl_unload calls");
+ goto keep_going;
+ }
+
+ /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook;
+ This will force the dynamic linker to call __d_trap when significant
+ events occur.
+
+ Note that the above is the pre-HP-UX 9.0 behaviour. At 9.0 and above,
+ the dld provides an export stub named "__d_trap" as well as the
+ function named "__d_trap" itself, but doesn't provide "_DLD_HOOK".
+ We'll look first for the old flavor and then the new.
+ */
+ msymbol = lookup_minimal_symbol ("_DLD_HOOK", NULL, symfile_objfile);
+ if (msymbol == NULL)
+ msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile);
+ if (msymbol == NULL)
+ {
+ warning ("Unable to find _DLD_HOOK symbol in object file.");
+ warning ("Suggest linking with /opt/langtools/lib/end.o.");
+ warning ("GDB will be unable to track shl_load/shl_unload calls");
+ goto keep_going;
+ }
+ anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
+ dld_cache.hook.address = anaddr;
+
+ /* Grrr, this might not be an export symbol! We have to find the
+ export stub. */
+ ALL_OBJFILES (objfile)
+ {
+ struct unwind_table_entry *u;
+ struct minimal_symbol *msymbol2;
+
+ /* What a crock. */
+ msymbol2 =
+ lookup_minimal_symbol_solib_trampoline (SYMBOL_LINKAGE_NAME (msymbol),
+ objfile);
+ /* Found a symbol with the right name. */
+ if (msymbol2)
+ {
+ struct unwind_table_entry *u;
+ /* It must be a shared library trampoline. */
+ if (SYMBOL_TYPE (msymbol2) != mst_solib_trampoline)
+ continue;
+
+ /* It must also be an export stub. */
+ u = find_unwind_entry (SYMBOL_VALUE (msymbol2));
+ if (!u || u->stub_unwind.stub_type != EXPORT)
+ continue;
+
+ /* OK. Looks like the correct import stub. */
+ anaddr = SYMBOL_VALUE (msymbol2);
+ dld_cache.hook_stub.address = anaddr;
+ }
+ }
+ store_unsigned_integer (buf, 4, anaddr);
+
+ msymbol = lookup_minimal_symbol ("__dld_hook", NULL, symfile_objfile);
+ if (msymbol == NULL)
+ {
+ warning ("Unable to find __dld_hook symbol in object file.");
+ warning ("Suggest linking with /opt/langtools/lib/end.o.");
+ warning ("GDB will be unable to track shl_load/shl_unload calls");
+ goto keep_going;
+ }
+ anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
+ status = target_write_memory (anaddr, buf, 4);
+
+ /* Now set a shlib_event breakpoint at __d_trap so we can track
+ significant shared library events. */
+ msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile);
+ if (msymbol == NULL)
+ {
+ warning ("Unable to find __dld_d_trap symbol in object file.");
+ warning ("Suggest linking with /opt/langtools/lib/end.o.");
+ warning ("GDB will be unable to track shl_load/shl_unload calls");
+ goto keep_going;
+ }
+ create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol));
+
+ /* We have all the support usually found in end.o, so we can track
+ shl_load and shl_unload calls. */
+ have_endo = 1;
+
+keep_going:
+
+ /* Get the address of __dld_flags, if no such symbol exists, then we can
+ not debug the shared code. */
+ msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL);
+ if (msymbol == NULL)
+ {
+ error ("Unable to find __dld_flags symbol in object file.\n");
+ }
+
+ anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
+
+ /* Read the current contents. */
+ status = target_read_memory (anaddr, buf, 4);
+ if (status != 0)
+ {
+ error ("Unable to read __dld_flags\n");
+ }
+ dld_flags = extract_unsigned_integer (buf, 4);
+
+ /* Turn on the flags we care about. */
+ dld_flags |= DLD_FLAGS_MAPPRIVATE;
+ if (have_endo)
+ dld_flags |= DLD_FLAGS_HOOKVALID;
+ store_unsigned_integer (buf, 4, dld_flags);
+ status = target_write_memory (anaddr, buf, 4);
+ if (status != 0)
+ {
+ error ("Unable to write __dld_flags\n");
+ }
+
+ /* Now find the address of _start and set a breakpoint there.
+ We still need this code for two reasons:
+
+ * Not all sites have /opt/langtools/lib/end.o, so it's not always
+ possible to track the dynamic linker's events.
+
+ * At this time no events are triggered for shared libraries
+ loaded at startup time (what a crock). */
+
+ msymbol = lookup_minimal_symbol ("_start", NULL, symfile_objfile);
+ if (msymbol == NULL)
+ {
+ error ("Unable to find _start symbol in object file.\n");
+ }
+
+ anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
+
+ /* Make the breakpoint at "_start" a shared library event breakpoint. */
+ create_solib_event_breakpoint (anaddr);
+
+ 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
+ som_solib_create_inferior_hook.
+
+ This operation does not remove any knowledge of shared libraries which
+ GDB may already have been notified of.
+ */
+static void
+som_solib_remove_inferior_hook (int pid)
+{
+ CORE_ADDR addr;
+ struct minimal_symbol *msymbol;
+ int status;
+ char dld_flags_buffer[4];
+ unsigned int dld_flags_value;
+ struct cleanup *old_cleanups = save_inferior_ptid ();
+
+ /* Ensure that we're really operating on the specified process. */
+ inferior_ptid = pid_to_ptid (pid);
+
+ /* We won't bother to remove the solib breakpoints from this process.
+
+ In fact, on PA64 the breakpoint is hard-coded into the dld callback,
+ and thus we're not supposed to remove it.
+
+ Rather, we'll merely clear the dld_flags bit that enables callbacks.
+ */
+ msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL);
+
+ addr = SYMBOL_VALUE_ADDRESS (msymbol);
+ status = target_read_memory (addr, dld_flags_buffer, 4);
+
+ dld_flags_value = extract_unsigned_integer (dld_flags_buffer, 4);
+
+ dld_flags_value &= ~DLD_FLAGS_HOOKVALID;
+ store_unsigned_integer (dld_flags_buffer, 4, dld_flags_value);
+ status = target_write_memory (addr, dld_flags_buffer, 4);
+
+ do_cleanups (old_cleanups);
+}
+
+static void
+som_special_symbol_handling (void)
+{
+}
+
+static void
+som_solib_desire_dynamic_linker_symbols (void)
+{
+ struct objfile *objfile;
+ struct unwind_table_entry *u;
+ struct minimal_symbol *dld_msymbol;
+
+ /* Do we already know the value of these symbols? If so, then
+ we've no work to do.
+
+ (If you add clauses to this test, be sure to likewise update the
+ test within the loop.)
+ */
+ if (dld_cache.is_valid)
+ return;
+
+ ALL_OBJFILES (objfile)
+ {
+ dld_msymbol = lookup_minimal_symbol ("shl_load", NULL, objfile);
+ if (dld_msymbol != NULL)
+ {
+ dld_cache.load.address = SYMBOL_VALUE (dld_msymbol);
+ dld_cache.load.unwind = find_unwind_entry (dld_cache.load.address);
+ }
+
+ dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_load",
+ objfile);
+ if (dld_msymbol != NULL)
+ {
+ if (SYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline)
+ {
+ u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol));
+ if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT))
+ {
+ dld_cache.load_stub.address = SYMBOL_VALUE (dld_msymbol);
+ dld_cache.load_stub.unwind = u;
+ }
+ }
+ }
+
+ dld_msymbol = lookup_minimal_symbol ("shl_unload", NULL, objfile);
+ if (dld_msymbol != NULL)
+ {
+ dld_cache.unload.address = SYMBOL_VALUE (dld_msymbol);
+ dld_cache.unload.unwind = find_unwind_entry (dld_cache.unload.address);
+
+ /* ??rehrauer: I'm not sure exactly what this is, but it appears
+ that on some HPUX 10.x versions, there's two unwind regions to
+ cover the body of "shl_unload", the second being 4 bytes past
+ the end of the first. This is a large hack to handle that
+ case, but since I don't seem to have any legitimate way to
+ look for this thing via the symbol table...
+ */
+ if (dld_cache.unload.unwind != NULL)
+ {
+ u = find_unwind_entry (dld_cache.unload.unwind->region_end + 4);
+ if (u != NULL)
+ {
+ dld_cache.unload2.address = u->region_start;
+ dld_cache.unload2.unwind = u;
+ }
+ }
+ }
+
+ dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_unload",
+ objfile);
+ if (dld_msymbol != NULL)
+ {
+ if (SYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline)
+ {
+ u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol));
+ if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT))
+ {
+ dld_cache.unload_stub.address = SYMBOL_VALUE (dld_msymbol);
+ dld_cache.unload_stub.unwind = u;
+ }
+ }
+ }
+
+ /* Did we find everything we were looking for? If so, stop. */
+ if ((dld_cache.load.address != 0)
+ && (dld_cache.load_stub.address != 0)
+ && (dld_cache.unload.address != 0)
+ && (dld_cache.unload_stub.address != 0))
+ {
+ dld_cache.is_valid = 1;
+ break;
+ }
+ }
+
+ dld_cache.hook.unwind = find_unwind_entry (dld_cache.hook.address);
+ dld_cache.hook_stub.unwind = find_unwind_entry (dld_cache.hook_stub.address);
+
+ /* We're prepared not to find some of these symbols, which is why
+ this function is a "desire" operation, and not a "require".
+ */
+}
+
+static int
+som_in_dynsym_resolve_code (CORE_ADDR pc)
+{
+ struct unwind_table_entry *u_pc;
+
+ /* Are we in the dld itself?
+
+ ??rehrauer: Large hack -- We'll assume that any address in a
+ shared text region is the dld's text. This would obviously
+ fall down if the user attached to a process, whose shlibs
+ weren't mapped to a (writeable) private region. However, in
+ that case the debugger probably isn't able to set the fundamental
+ breakpoint in the dld callback anyways, so this hack should be
+ safe.
+ */
+ if ((pc & (CORE_ADDR) 0xc0000000) == (CORE_ADDR) 0xc0000000)
+ return 1;
+
+ /* Cache the address of some symbols that are part of the dynamic
+ linker, if not already known.
+ */
+ som_solib_desire_dynamic_linker_symbols ();
+
+ /* Are we in the dld callback? Or its export stub? */
+ u_pc = find_unwind_entry (pc);
+ if (u_pc == NULL)
+ return 0;
+
+ if ((u_pc == dld_cache.hook.unwind) || (u_pc == dld_cache.hook_stub.unwind))
+ return 1;
+
+ /* Or the interface of the dld (i.e., "shl_load" or friends)? */
+ if ((u_pc == dld_cache.load.unwind)
+ || (u_pc == dld_cache.unload.unwind)
+ || (u_pc == dld_cache.unload2.unwind)
+ || (u_pc == dld_cache.load_stub.unwind)
+ || (u_pc == dld_cache.unload_stub.unwind))
+ return 1;
+
+ /* Apparently this address isn't part of the dld's text. */
+ return 0;
+}
+
+static void
+som_clear_solib (void)
+{
+}
+
+enum dld_list_offsets {
+ DLD_LIST_OFFSET_NAME = 0,
+ DLD_LIST_OFFSET_INFO = 4,
+ DLD_LIST_OFFSET_TEXT_ADDR = 8,
+ DLD_LIST_OFFSET_TEXT_LINK_ADDR = 12,
+ DLD_LIST_OFFSET_TEXT_END = 16,
+ DLD_LIST_OFFSET_DATA_START = 20,
+ DLD_LIST_OFFSET_BSS_START = 24,
+ DLD_LIST_OFFSET_DATA_END = 28,
+ DLD_LIST_OFFSET_GOT_VALUE = 32,
+ DLD_LIST_OFFSET_NEXT = 36,
+ DLD_LIST_OFFSET_TSD_START_ADDR_PTR = 40,
+ DLD_LIST_ENTRY_SIZE = 44
+};
+
+static CORE_ADDR
+link_map_start (void)
+{
+ struct minimal_symbol *sym;
+ CORE_ADDR addr;
+ char buf[4];
+ unsigned int dld_flags;
+
+ sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL);
+ if (!sym)
+ {
+ error ("Unable to find __dld_flags symbol in object file.\n");
+ return 0;
+ }
+ addr = SYMBOL_VALUE_ADDRESS (sym);
+ read_memory (addr, buf, 4);
+ dld_flags = extract_unsigned_integer (buf, 4);
+ if ((dld_flags & DLD_FLAGS_LISTVALID) == 0)
+ {
+ error ("__dld_list is not valid according to __dld_flags.\n");
+ return 0;
+ }
+
+ /* If the libraries were not mapped private, warn the user. */
+ if ((dld_flags & DLD_FLAGS_MAPPRIVATE) == 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.\n");
+
+ sym = lookup_minimal_symbol ("__dld_list", NULL, NULL);
+ if (!sym)
+ {
+ /* Older crt0.o files (hpux8) don't have __dld_list as a symbol,
+ but the data is still available if you know where to look. */
+ sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL);
+ if (!sym)
+ {
+ error ("Unable to find dynamic library list.\n");
+ return 0;
+ }
+ addr = SYMBOL_VALUE_ADDRESS (sym) - 8;
+ }
+ else
+ addr = SYMBOL_VALUE_ADDRESS (sym);
+
+ read_memory (addr, buf, 4);
+ addr = extract_unsigned_integer (buf, 4);
+ if (addr == 0)
+ {
+ error ("Debugging dynamic executables loaded via the hpux8 dld.sl is not supported.\n");
+ return 0;
+ }
+
+ read_memory (addr, buf, 4);
+ return extract_unsigned_integer (buf, 4);
+}
+
+/* Does this so's name match the main binary? */
+static int
+match_main (const char *name)
+{
+ return strcmp (name, symfile_objfile->name) == 0;
+}
+
+static struct so_list *
+som_current_sos (void)
+{
+ CORE_ADDR lm;
+ struct so_list *head = 0;
+ struct so_list **link_ptr = &head;
+
+ for (lm = link_map_start (); lm; )
+ {
+ char *namebuf;
+ CORE_ADDR addr;
+ struct so_list *new;
+ struct cleanup *old_chain;
+ int errcode;
+ char dbuf[DLD_LIST_ENTRY_SIZE];
+ char tsdbuf[4];
+
+ new = (struct so_list *) xmalloc (sizeof (struct so_list));
+ old_chain = make_cleanup (xfree, new);
+
+ memset (new, 0, sizeof (*new));
+ new->lm_info = xmalloc (sizeof (struct lm_info));
+ make_cleanup (xfree, new->lm_info);
+
+ read_memory (lm, dbuf, DLD_LIST_ENTRY_SIZE);
+
+ addr = extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_NAME], 4);
+ target_read_string (addr, &namebuf, SO_NAME_MAX_PATH_SIZE - 1, &errcode);
+ if (errcode != 0)
+ {
+ warning ("current_sos: Can't read pathname for load map: %s\n",
+ safe_strerror (errcode));
+ }
+ else
+ {
+ strncpy (new->so_name, namebuf, SO_NAME_MAX_PATH_SIZE - 1);
+ new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
+ xfree (namebuf);
+ strcpy (new->so_original_name, new->so_name);
+ }
+
+ if (new->so_name[0] && !match_main (new->so_name))
+ {
+ struct lm_info *lmi = new->lm_info;
+ unsigned int tmp;
+
+ lmi->lm_addr = lm;
+
+ lmi->text_addr =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_TEXT_ADDR], 4);
+ tmp =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_INFO], 4);
+
+ lmi->library_version = (tmp >> 16) & 0xffff;
+ lmi->bind_mode = (tmp >> 8) & 0xff;
+ lmi->struct_version = tmp & 0xff;
+
+ lmi->text_link_addr =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_TEXT_LINK_ADDR], 4);
+ lmi->text_end =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_TEXT_END], 4);
+ lmi->data_start =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_DATA_START], 4);
+ lmi->bss_start =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_BSS_START], 4);
+ lmi->data_end =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_DATA_END], 4);
+ lmi->got_value =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_GOT_VALUE], 4);
+ tmp =
+ extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_TSD_START_ADDR_PTR], 4);
+ read_memory (tmp, tsdbuf, 4);
+ lmi->tsd_start_addr = extract_unsigned_integer (tsdbuf, 4);
+
+#ifdef SOLIB_SOM_DBG
+ printf ("\n+ library \"%s\" is described at 0x%s\n", new->so_name,
+ paddr_nz (lm));
+ printf (" 'version' is %d\n", new->lm_info->struct_version);
+ printf (" 'bind_mode' is %d\n", new->lm_info->bind_mode);
+ printf (" 'library_version' is %d\n",
+ new->lm_info->library_version);
+ printf (" 'text_addr' is 0x%s\n",
+ paddr_nz (new->lm_info->text_addr));
+ printf (" 'text_link_addr' is 0x%s\n",
+ paddr_nz (new->lm_info->text_link_addr));
+ printf (" 'text_end' is 0x%s\n",
+ paddr_nz (new->lm_info->text_end));
+ printf (" 'data_start' is 0x%s\n",
+ paddr_nz (new->lm_info->data_start));
+ printf (" 'bss_start' is 0x%s\n",
+ paddr_nz (new->lm_info->bss_start));
+ printf (" 'data_end' is 0x%s\n",
+ paddr_nz (new->lm_info->data_end));
+ printf (" 'got_value' is %s\n",
+ paddr_nz (new->lm_info->got_value));
+ printf (" 'tsd_start_addr' is 0x%s\n",
+ paddr_nz (new->lm_info->tsd_start_addr));
+#endif
+
+ /* Link the new object onto the list. */
+ new->next = NULL;
+ *link_ptr = new;
+ link_ptr = &new->next;
+ }
+ else
+ {
+ free_so (new);
+ }
+
+ lm = extract_unsigned_integer (&dbuf[DLD_LIST_OFFSET_NEXT], 4);
+ discard_cleanups (old_chain);
+ }
+
+ /* TODO: The original somsolib code has logic to detect and eliminate
+ duplicate entries. Do we need that? */
+
+ return head;
+}
+
+static int
+som_open_symbol_file_object (void *from_ttyp)
+{
+ CORE_ADDR lm, l_name;
+ char *filename;
+ int errcode;
+ int from_tty = *(int *)from_ttyp;
+ char buf[4];
+
+ if (symfile_objfile)
+ if (!query ("Attempt to reload symbols from process? "))
+ return 0;
+
+ /* First link map member should be the executable. */
+ if ((lm = link_map_start ()) == 0)
+ return 0; /* failed somehow... */
+
+ /* Read address of name from target memory to GDB. */
+ read_memory (lm + DLD_LIST_OFFSET_NAME, buf, 4);
+
+ /* Convert the address to host format. Assume that the address is
+ unsigned. */
+ l_name = extract_unsigned_integer (buf, 4);
+
+ if (l_name == 0)
+ return 0; /* No filename. */
+
+ /* Now fetch the filename from target memory. */
+ target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode);
+
+ if (errcode)
+ {
+ warning ("failed to read exec filename from attached file: %s",
+ safe_strerror (errcode));
+ return 0;
+ }
+
+ make_cleanup (xfree, filename);
+ /* Have a pathname: read the symbol file. */
+ symbol_file_add_main (filename, from_tty);
+
+ return 1;
+}
+
+static void
+som_free_so (struct so_list *so)
+{
+ xfree (so->lm_info);
+}
+
+static struct target_so_ops som_so_ops;
+
+extern initialize_file_ftype _initialize_som_solib; /* -Wmissing-prototypes */
+
+void
+_initialize_som_solib (void)
+{
+ som_so_ops.relocate_section_addresses = som_relocate_section_addresses;
+ som_so_ops.free_so = som_free_so;
+ som_so_ops.clear_solib = som_clear_solib;
+ som_so_ops.solib_create_inferior_hook = som_solib_create_inferior_hook;
+ som_so_ops.special_symbol_handling = som_special_symbol_handling;
+ som_so_ops.current_sos = som_current_sos;
+ som_so_ops.open_symbol_file_object = som_open_symbol_file_object;
+ som_so_ops.in_dynsym_resolve_code = som_in_dynsym_resolve_code;
+}
+
+void som_solib_select (void)
+{
+ current_target_so_ops = &som_so_ops;
+}
+
+/* The rest of these functions are not part of the solib interface; they
+ are used by somread.c or hppa-hpux-tdep.c */
+
+int
+som_solib_section_offsets (struct objfile *objfile,
+ struct section_offsets *offsets)
+{
+ struct so_list *so_list = master_so_list ();
+
+ while (so_list)
+ {
+ /* Oh what a pain! We need the offsets before so_list->objfile
+ is valid. The BFDs will never match. Make a best guess. */
+ if (strstr (objfile->name, so_list->so_name))
+ {
+ asection *private_section;
+
+ /* The text offset is easy. */
+ offsets->offsets[SECT_OFF_TEXT (objfile)]
+ = (so_list->lm_info->text_addr
+ - so_list->lm_info->text_link_addr);
+ offsets->offsets[SECT_OFF_RODATA (objfile)]
+ = ANOFFSET (offsets, SECT_OFF_TEXT (objfile));
+
+ /* We should look at presumed_dp in the SOM header, but
+ that's not easily available. This should be OK though. */
+ private_section = bfd_get_section_by_name (objfile->obfd,
+ "$PRIVATE$");
+ if (!private_section)
+ {
+ warning ("Unable to find $PRIVATE$ in shared library!");
+ offsets->offsets[SECT_OFF_DATA (objfile)] = 0;
+ offsets->offsets[SECT_OFF_BSS (objfile)] = 0;
+ return 1;
+ }
+ offsets->offsets[SECT_OFF_DATA (objfile)]
+ = (so_list->lm_info->data_start - private_section->vma);
+ offsets->offsets[SECT_OFF_BSS (objfile)]
+ = ANOFFSET (offsets, SECT_OFF_DATA (objfile));
+ return 1;
+ }
+ so_list = so_list->next;
+ }
+ return 0;
+}
+
+/* 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
+som_solib_get_got_by_pc (CORE_ADDR addr)
+{
+ struct so_list *so_list = master_so_list ();
+ CORE_ADDR got_value = 0;
+
+ while (so_list)
+ {
+ if (so_list->lm_info->text_addr <= addr
+ && so_list->lm_info->text_end > addr)
+ {
+ got_value = so_list->lm_info->got_value;
+ break;
+ }
+ so_list = so_list->next;
+ }
+ return got_value;
+}
+
+/* Get some HPUX-specific data from a shared lib.
+ */
+CORE_ADDR
+som_solib_thread_start_addr (struct so_list *so)
+{
+ return so->lm_info->tsd_start_addr;
+}
+
+/* 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 initialize_hp_cxx_exception_support in
+ hppa-hpux-tdep.c */
+
+CORE_ADDR
+som_solib_get_solib_by_pc (CORE_ADDR addr)
+{
+ struct so_list *so_list = master_so_list ();
+
+ while (so_list)
+ {
+ if (so_list->lm_info->text_addr <= addr
+ && so_list->lm_info->text_end > addr)
+ {
+ break;
+ }
+ so_list = so_list->next;
+ }
+ if (so_list)
+ return so_list->lm_info->lm_addr;
+ else
+ return 0;
+}
--
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/