/* Handle HP SOM shared libraries for GDB, the GNU Debugger.
- Copyright 1993 Free Software Foundation, Inc.
+ Copyright 1993, 1996 Free Software Foundation, Inc.
This file is part of GDB.
#include "inferior.h"
#include "gdb-stabs.h"
#include "gdbcmd.h"
+#include "language.h"
/* TODO:
* Most of this code should work for hp300 shared libraries. Does
anyone care enough to weed out any SOM-isms.
- * Do we need/want a command to load a shared library?
-
- * Support for hpux8 dynamic linker.
-
- * Support for tracking user calls to dld_load, dld_unload. */
+ * Support for hpux8 dynamic linker. */
/* The basic structure which describes a dynamically loaded object. This
data structure is private to the dynamic linker and isn't found in
static void som_sharedlibrary_info_command PARAMS ((char *, int));
+static void som_solib_sharedlibrary_command PARAMS ((char *, int));
+
/* Add symbols from shared libraries into the symtab list. */
void
struct so_list *new_so;
struct so_list *so_list = so_list_head;
struct section_table *p;
+ struct stat statbuf;
if (addr == 0)
break;
so_list = so_list->next;
}
- /* We've already loaded this one or it's the main program, skip it. */
+ /* See if the file exists. If not, give a warning, but don't
+ die. */
+ status = stat (name, &statbuf);
+ if (status == -1)
+ {
+ warning ("Can't find file %s referenced in dld_list.", name);
+
+ status = target_read_memory (addr + 36, buf, 4);
+ if (status != 0)
+ goto err;
+
+ addr = (CORE_ADDR) extract_unsigned_integer (buf, 4);
+ continue;
+ }
+
+ /* If we've already loaded this one or it's the main program, skip it. */
if (so_list || !strcmp (name, symfile_objfile->name))
{
status = target_read_memory (addr + 36, buf, 4);
text_addr = extract_unsigned_integer (buf, 4);
- new_so = (struct so_list *) malloc (sizeof (struct so_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)
{
if (status != 0)
{
int old, new;
+ int update_coreops;
+
+ /* We must update the to_sections field in the core_ops structure
+ here, otherwise we dereference a potential dangling pointer
+ for each call to target_read/write_memory within this routine. */
+ update_coreops = core_ops.to_sections == target->to_sections;
new = new_so->sections_end - new_so->sections;
/* Add sections from the shared library to the core target. */
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. */
+ if (update_coreops)
+ {
+ core_ops.to_sections = target->to_sections;
+ core_ops.to_sections_end = target->to_sections_end;
+ }
+
+ /* Copy over the old data before it gets clobbered. */
memcpy ((char *)(target->to_sections + old),
new_so->sections,
((sizeof (struct section_table)) * new));
som_solib_create_inferior_hook()
{
struct minimal_symbol *msymbol;
- unsigned int dld_flags, status;
+ unsigned int dld_flags, status, have_endo;
asection *shlib_info;
- char shadow_contents[BREAKPOINT_MAX], buf[4];
+ 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;
if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0)
return;
+ have_endo = 0;
+ /* If __d_pid is present, then put the inferior's pid into __d_pid. hpux9
+ requires __d_pid to be set. hpux10 doesn't require __d_pid to be set
+ and the symbol may not be available.
+
+ Never warn about __d_pid. */
+ msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile);
+ if (msymbol != NULL)
+ {
+ 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");
+ goto keep_going;
+ }
+ }
+
+ /* If __d_trap_fptr exists, then load whatever's at that address
+ and put it into __dld_hook. */
+ msymbol = lookup_minimal_symbol ("__d_trap_fptr", NULL, symfile_objfile);
+ if (msymbol != NULL)
+ {
+ anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
+ status = target_read_memory (anaddr, buf, 4);
+ anaddr = extract_unsigned_integer (buf, 4);
+
+ /* If it's a plabel, then get the address of the real function.
+ Egad. This is just the opposite of how hpux9 and _DLD_HOOK
+ works. */
+ if (anaddr | 0x2)
+ {
+ status = target_read_memory (anaddr & ~0x2, buf, 4);
+ anaddr = extract_unsigned_integer (buf, 4);
+ }
+ }
+ else
+ {
+ /* 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. */
+ 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 /usr/lib/end.o.");
+ warning ("GDB will be unable to track shl_load/shl_unload calls");
+ goto keep_going;
+ }
+ anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
+
+ /* Grrr, this might not be an export symbol! We have to find the
+ export stub. */
+ ALL_OBJFILES (objfile)
+ {
+ extern struct unwind_table_entry *find_unwind_entry PARAMS ((CORE_ADDR pc));
+
+ /* What a crock. */
+ msymbol
+ = lookup_minimal_symbol_solib_trampoline (SYMBOL_NAME (msymbol),
+ NULL, objfile);
+ /* Found a symbol with the right name. */
+ if (msymbol)
+ {
+ struct unwind_table_entry *u;
+ /* It must be a shared library trampoline. */
+ if (MSYMBOL_TYPE (msymbol) != mst_solib_trampoline)
+ continue;
+
+ /* It must also be an export stub. */
+ u = find_unwind_entry (SYMBOL_VALUE (msymbol));
+ if (!u || u->stub_type != EXPORT)
+ continue;
+
+ /* OK. Looks like the correct import stub. */
+ anaddr = SYMBOL_VALUE (msymbol);
+ break;
+ }
+ }
+ }
+ 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 /usr/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 /usr/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");
+ goto keep_going;
return;
}
dld_flags = extract_unsigned_integer (buf, 4);
/* Turn on the flags we care about. */
- dld_flags |= 0x5;
+ dld_flags |= (0x5 | (have_endo << 1));
store_unsigned_integer (buf, 4, dld_flags);
status = target_write_memory (anaddr, buf, 4);
if (status != 0)
return;
}
- /* Now find the address of _start and set a breakpoint there. */
+ /* Now find the address of _start and set a breakpoint there.
+ We still need this code for two reasons:
+
+ * Not all sites have /usr/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)
{
}
anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
- if (target_insert_breakpoint (anaddr, shadow_contents))
- {
- error ("Unable to set breakpoint at _start.\n");
- return;
- }
+
+ /* Make the breakpoint at "_start" a shared library event breakpoint. */
+ create_solib_event_breakpoint (anaddr);
/* Wipe out all knowledge of old shared libraries since their
mapping can change from one exec to another! */
free (so_list_head);
so_list_head = temp->next;
}
-
- /* Start the process again and wait for it to hit our breakpoint. */
- clear_proceed_status ();
- stop_soon_quietly = 1;
- stop_signal = TARGET_SIGNAL_0;
- do
- {
- target_resume (-1, 0, stop_signal);
- wait_for_inferior ();
- }
- while (stop_signal != TARGET_SIGNAL_TRAP);
- stop_soon_quietly = 0;
-
- /* All the libraries should be mapped in now. Remove our breakpoint and
- read in the symbol tables from the shared libraries. */
- if (target_remove_breakpoint (anaddr, shadow_contents))
- {
- error ("Unable to remove breakpoint at _start.\n");
- return;
- }
-
- if (auto_solib_add_at_startup)
- som_solib_add ((char *) 0, 0, (struct target_ops *) 0);
+ clear_symtab_users ();
}
/* Return the GOT value for the shared library in which ADDR belongs. If
"Status of loaded shared object libraries.");
add_show_from_set
(add_set_cmd ("auto-solib-add", class_support, var_zinteger,
- (char *) &auto_solib_add_at_startup,
+ (char *) &auto_solib_add,
"Set autoloading of shared library symbols at startup.\n\
If nonzero, symbols from all shared object libraries will be loaded\n\
-automatically when the inferior begins execution. Otherwise, symbols\n\
+automatically when the inferior begins execution or when the dynamic linker\n\
+informs gdb that a new library has been loaded. Otherwise, symbols\n\
must be loaded manually, using `sharedlibrary'.",
&setlist),
&showlist);
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