diff options
Diffstat (limited to 'gdb/hppa-hpux-tdep.c')
| -rw-r--r-- | gdb/hppa-hpux-tdep.c | 575 |
1 files changed, 0 insertions, 575 deletions
diff --git a/gdb/hppa-hpux-tdep.c b/gdb/hppa-hpux-tdep.c index ab44e95..ba2390c 100644 --- a/gdb/hppa-hpux-tdep.c +++ b/gdb/hppa-hpux-tdep.c @@ -67,14 +67,6 @@ extern void _initialize_hppa_hpux_tdep (void); extern initialize_file_ftype _initialize_hppa_hpux_tdep; -typedef struct - { - struct minimal_symbol *msym; - CORE_ADDR solib_handle; - CORE_ADDR return_val; - } -args_for_find_stub; - static int in_opd_section (CORE_ADDR pc) { @@ -571,562 +563,6 @@ hppa_skip_permanent_breakpoint (struct regcache *regcache) /* We can leave the tail's space the same, since there's no jump. */ } -/* Exception handling support for the HP-UX ANSI C++ compiler. - The compiler (aCC) provides a callback for exception events; - GDB can set a breakpoint on this callback and find out what - exception event has occurred. */ - -/* The name of the hook to be set to point to the callback function. */ -static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook"; -/* The name of the function to be used to set the hook value. */ -static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value"; -/* The name of the callback function in end.o */ -static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback"; -/* Name of function in end.o on which a break is set (called by above). */ -static char HP_ACC_EH_break[] = "__d_eh_break"; -/* Name of flag (in end.o) that enables catching throws. */ -static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw"; -/* Name of flag (in end.o) that enables catching catching. */ -static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch"; -/* The enum used by aCC. */ -typedef enum - { - __EH_NOTIFY_THROW, - __EH_NOTIFY_CATCH - } -__eh_notification; - -/* Is exception-handling support available with this executable? */ -static int hp_cxx_exception_support = 0; -/* Has the initialize function been run? */ -static int hp_cxx_exception_support_initialized = 0; -/* Address of __eh_notify_hook */ -static CORE_ADDR eh_notify_hook_addr = 0; -/* Address of __d_eh_notify_callback */ -static CORE_ADDR eh_notify_callback_addr = 0; -/* Address of __d_eh_break */ -static CORE_ADDR eh_break_addr = 0; -/* Address of __d_eh_catch_catch */ -static CORE_ADDR eh_catch_catch_addr = 0; -/* Address of __d_eh_catch_throw */ -static CORE_ADDR eh_catch_throw_addr = 0; -/* Sal for __d_eh_break */ -static struct symtab_and_line *break_callback_sal = 0; - -/* Code in end.c expects __d_pid to be set in the inferior, - otherwise __d_eh_notify_callback doesn't bother to call - __d_eh_break! So we poke the pid into this symbol - ourselves. - 0 => success - 1 => failure */ -static int -setup_d_pid_in_inferior (void) -{ - CORE_ADDR anaddr; - struct minimal_symbol *msymbol; - char buf[4]; /* FIXME 32x64? */ - - /* 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.\n" - "Suggest linking executable with -g (links in /opt/langtools/lib/end.o).")); - return 1; - } - - anaddr = SYMBOL_VALUE_ADDRESS (msymbol); - store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */ - if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */ - { - warning (_("Unable to write __d_pid.\n" - "Suggest linking executable with -g (links in /opt/langtools/lib/end.o).")); - return 1; - } - return 0; -} - -/* elz: Used to lookup a symbol in the shared libraries. - This function calls shl_findsym, indirectly through a - call to __d_shl_get. __d_shl_get is in end.c, which is always - linked in by the hp compilers/linkers. - The call to shl_findsym cannot be made directly because it needs - to be active in target address space. - inputs: - minimal symbol pointer for the function we want to look up - - address in target space of the descriptor for the library - where we want to look the symbol up. - This address is retrieved using the - som_solib_get_solib_by_pc function (somsolib.c). - output: - real address in the library of the function. - note: the handle can be null, in which case shl_findsym will look for - the symbol in all the loaded shared libraries. - files to look at if you need reference on this stuff: - dld.c, dld_shl_findsym.c - end.c - man entry for shl_findsym */ - -static CORE_ADDR -find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle) -{ - struct symbol *get_sym, *symbol2; - struct minimal_symbol *buff_minsym, *msymbol; - struct type *ftype; - struct value **args; - struct value *funcval; - struct value *val; - - int x, namelen, err_value, tmp = -1; - CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr; - CORE_ADDR stub_addr; - - - args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */ - funcval = find_function_in_inferior ("__d_shl_get"); - get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_DOMAIN, NULL, NULL); - buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL); - msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL); - symbol2 = lookup_symbol ("__shldp", NULL, VAR_DOMAIN, NULL, NULL); - endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym); - namelen = strlen (DEPRECATED_SYMBOL_NAME (function)); - value_return_addr = endo_buff_addr + namelen; - ftype = check_typedef (SYMBOL_TYPE (get_sym)); - - /* do alignment */ - if ((x = value_return_addr % 64) != 0) - value_return_addr = value_return_addr + 64 - x; - - errno_return_addr = value_return_addr + 64; - - - /* set up stuff needed by __d_shl_get in buffer in end.o */ - - target_write_memory (endo_buff_addr, DEPRECATED_SYMBOL_NAME (function), namelen); - - target_write_memory (value_return_addr, (char *) &tmp, 4); - - target_write_memory (errno_return_addr, (char *) &tmp, 4); - - target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), - (char *) &handle, 4); - - /* now prepare the arguments for the call */ - - args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12); - args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol)); - args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr); - args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), 3 /* TYPE_PROCEDURE */); - args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr); - args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr); - - /* now call the function */ - - val = call_function_by_hand (funcval, 6, args); - - /* now get the results */ - - target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value)); - - target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr)); - if (stub_addr <= 0) - error (_("call to __d_shl_get failed, error code is %d"), err_value); - - return (stub_addr); -} - -/* Cover routine for find_stub_with_shl_get to pass to catch_errors */ -static int -cover_find_stub_with_shl_get (void *args_untyped) -{ - args_for_find_stub *args = args_untyped; - args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle); - return 0; -} - -/* Initialize exception catchpoint support by looking for the - necessary hooks/callbacks in end.o, etc., and set the hook value - to point to the required debug function. - - Return 0 => failure - 1 => success */ - -static int -initialize_hp_cxx_exception_support (void) -{ - struct symtabs_and_lines sals; - struct cleanup *old_chain; - struct cleanup *canonical_strings_chain = NULL; - int i; - char *addr_start; - char *addr_end = NULL; - char **canonical = (char **) NULL; - int thread = -1; - struct symbol *sym = NULL; - struct minimal_symbol *msym = NULL; - struct objfile *objfile; - asection *shlib_info; - - /* Detect and disallow recursion. On HP-UX with aCC, infinite - recursion is a possibility because finding the hook for exception - callbacks involves making a call in the inferior, which means - re-inserting breakpoints which can re-invoke this code. */ - - static int recurse = 0; - if (recurse > 0) - { - hp_cxx_exception_support_initialized = 0; - deprecated_exception_support_initialized = 0; - return 0; - } - - hp_cxx_exception_support = 0; - - /* First check if we have seen any HP compiled objects; if not, - it is very unlikely that HP's idiosyncratic callback mechanism - for exception handling debug support will be available! - This will percolate back up to breakpoint.c, where our callers - will decide to try the g++ exception-handling support instead. */ - if (!deprecated_hp_som_som_object_present) - return 0; - - /* We have a SOM executable with SOM debug info; find the hooks. */ - - /* First look for the notify hook provided by aCC runtime libs */ - /* If we find this symbol, we conclude that the executable must - have HP aCC exception support built in. If this symbol is not - found, even though we're a HP SOM-SOM file, we may have been - built with some other compiler (not aCC). This results percolates - back up to our callers in breakpoint.c which can decide to - try the g++ style of exception support instead. - If this symbol is found but the other symbols we require are - not found, there is something weird going on, and g++ support - should *not* be tried as an alternative. - - ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined. - ASSUMPTION: HP aCC and g++ modules cannot be linked together. */ - - /* libCsup has this hook; it'll usually be non-debuggable */ - msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL); - if (msym) - { - eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym); - hp_cxx_exception_support = 1; - } - else - { - warning (_("\ -Unable to find exception callback hook (%s).\n\ -Executable may not have been compiled debuggable with HP aCC.\n\ -GDB will be unable to intercept exception events."), - HP_ACC_EH_notify_hook); - eh_notify_hook_addr = 0; - hp_cxx_exception_support = 0; - return 0; - } - - /* Next look for the notify callback routine in end.o */ - /* This is always available in the SOM symbol dictionary if end.o is - linked in. */ - msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL); - if (msym) - { - eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym); - hp_cxx_exception_support = 1; - } - else - { - warning (_("\ -Unable to find exception callback routine (%s).\n\ -Suggest linking executable with -g (links in /opt/langtools/lib/end.o).\n\ -GDB will be unable to intercept exception events."), - HP_ACC_EH_notify_callback); - eh_notify_callback_addr = 0; - return 0; - } - - if (!gdbarch_tdep (current_gdbarch)->is_elf) - { - /* Check whether the executable is dynamically linked or archive bound */ - /* With an archive-bound executable we can use the raw addresses we find - for the callback function, etc. without modification. For an executable - with shared libraries, we have to do more work to find the plabel, which - can be the target of a call through $$dyncall from the aCC runtime - support library (libCsup) which is linked shared by default by aCC. */ - /* This test below was copied from somsolib.c/somread.c. It may not be a very - reliable one to test that an executable is linked shared. - pai/1997-07-18 */ - shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); - if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0)) - { - /* The minsym we have has the local code address, but that's not - the plabel that can be used by an inter-load-module call. */ - /* Find solib handle for main image (which has end.o), and use - that and the min sym as arguments to __d_shl_get() (which - does the equivalent of shl_findsym()) to find the plabel. */ - - args_for_find_stub args; - - args.solib_handle = gdbarch_tdep (current_gdbarch)->solib_get_solib_by_pc (eh_notify_callback_addr); - args.msym = msym; - args.return_val = 0; - - recurse++; - catch_errors (cover_find_stub_with_shl_get, &args, - _("Error while finding exception callback hook:\n"), - RETURN_MASK_ALL); - eh_notify_callback_addr = args.return_val; - recurse--; - - deprecated_exception_catchpoints_are_fragile = 1; - - if (!eh_notify_callback_addr) - { - /* We can get here either if there is no plabel in the export list - for the main image, or if something strange happened (?) */ - warning (_("\ -Couldn't find a plabel (indirect function label) for the exception callback.\n\ -GDB will not be able to intercept exception events.")); - return 0; - } - } - else - deprecated_exception_catchpoints_are_fragile = 0; - } - - /* Now, look for the breakpointable routine in end.o */ - /* This should also be available in the SOM symbol dict. if end.o linked in */ - msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL); - if (msym) - { - eh_break_addr = SYMBOL_VALUE_ADDRESS (msym); - hp_cxx_exception_support = 1; - } - else - { - warning (_("\ -Unable to find exception callback routine to set breakpoint (%s).\n\ -Suggest linking executable with -g (link in /opt/langtools/lib/end.o).\n\ -GDB will be unable to intercept exception events."), - HP_ACC_EH_break); - eh_break_addr = 0; - return 0; - } - - /* Next look for the catch enable flag provided in end.o */ - sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, - VAR_DOMAIN, 0, (struct symtab **) NULL); - if (sym) /* sometimes present in debug info */ - { - eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym); - hp_cxx_exception_support = 1; - } - else - /* otherwise look in SOM symbol dict. */ - { - msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL); - if (msym) - { - eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym); - hp_cxx_exception_support = 1; - } - else - { - warning (_("\ -Unable to enable interception of exception catches.\n\ -Executable may not have been compiled debuggable with HP aCC.\n\ -Suggest linking executable with -g (link in /opt/langtools/lib/end.o).")); - return 0; - } - } - - /* Next look for the catch enable flag provided end.o */ - sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, - VAR_DOMAIN, 0, (struct symtab **) NULL); - if (sym) /* sometimes present in debug info */ - { - eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym); - hp_cxx_exception_support = 1; - } - else - /* otherwise look in SOM symbol dict. */ - { - msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL); - if (msym) - { - eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym); - hp_cxx_exception_support = 1; - } - else - { - warning (_("\ -Unable to enable interception of exception throws.\n\ -Executable may not have been compiled debuggable with HP aCC.\n\ -Suggest linking executable with -g (link in /opt/langtools/lib/end.o).")); - return 0; - } - } - - /* Set the flags */ - hp_cxx_exception_support = 2; /* everything worked so far */ - hp_cxx_exception_support_initialized = 1; - deprecated_exception_support_initialized = 1; - - return 1; -} - -/* Target operation for enabling or disabling interception of - exception events. - KIND is either EX_EVENT_THROW or EX_EVENT_CATCH - ENABLE is either 0 (disable) or 1 (enable). - Return value is NULL if no support found; - -1 if something went wrong, - or a pointer to a symtab/line struct if the breakpointable - address was found. */ - -struct symtab_and_line * -child_enable_exception_callback (enum exception_event_kind kind, int enable) -{ - char buf[4]; - - if (!deprecated_exception_support_initialized - || !hp_cxx_exception_support_initialized) - if (!initialize_hp_cxx_exception_support ()) - return NULL; - - switch (hp_cxx_exception_support) - { - case 0: - /* Assuming no HP support at all */ - return NULL; - case 1: - /* HP support should be present, but something went wrong */ - return (struct symtab_and_line *) -1; /* yuck! */ - /* there may be other cases in the future */ - } - - /* Set the EH hook to point to the callback routine. */ - store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */ - /* pai: (temp) FIXME should there be a pack operation first? */ - if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */ - { - warning (_("\ -Could not write to target memory for exception event callback.\n\ -Interception of exception events may not work.")); - return (struct symtab_and_line *) -1; - } - if (enable) - { - /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */ - if (PIDGET (inferior_ptid) > 0) - { - if (setup_d_pid_in_inferior ()) - return (struct symtab_and_line *) -1; - } - else - { - warning (_("Internal error: Invalid inferior pid? Cannot intercept exception events.")); - return (struct symtab_and_line *) -1; - } - } - - switch (kind) - { - case EX_EVENT_THROW: - store_unsigned_integer (buf, 4, enable ? 1 : 0); - if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */ - { - warning (_("Couldn't enable exception throw interception.")); - return (struct symtab_and_line *) -1; - } - break; - case EX_EVENT_CATCH: - store_unsigned_integer (buf, 4, enable ? 1 : 0); - if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */ - { - warning (_("Couldn't enable exception catch interception.")); - return (struct symtab_and_line *) -1; - } - break; - default: - error (_("Request to enable unknown or unsupported exception event.")); - } - - /* Copy break address into new sal struct, malloc'ing if needed. */ - if (!break_callback_sal) - break_callback_sal = XMALLOC (struct symtab_and_line); - init_sal (break_callback_sal); - break_callback_sal->symtab = NULL; - break_callback_sal->pc = eh_break_addr; - break_callback_sal->line = 0; - break_callback_sal->end = eh_break_addr; - - return break_callback_sal; -} - -/* Record some information about the current exception event */ -static struct exception_event_record current_ex_event; - -/* Report current exception event. Returns a pointer to a record - that describes the kind of the event, where it was thrown from, - and where it will be caught. More information may be reported - in the future */ -struct exception_event_record * -child_get_current_exception_event (void) -{ - CORE_ADDR event_kind; - CORE_ADDR throw_addr; - CORE_ADDR catch_addr; - struct frame_info *fi, *curr_frame; - int level = 1; - - curr_frame = get_current_frame (); - if (!curr_frame) - return (struct exception_event_record *) NULL; - - /* Go up one frame to __d_eh_notify_callback, because at the - point when this code is executed, there's garbage in the - arguments of __d_eh_break. */ - fi = find_relative_frame (curr_frame, &level); - if (level != 0) - return (struct exception_event_record *) NULL; - - select_frame (fi); - - /* Read in the arguments */ - /* __d_eh_notify_callback() is called with 3 arguments: - 1. event kind catch or throw - 2. the target address if known - 3. a flag -- not sure what this is. pai/1997-07-17 */ - event_kind = read_register (HPPA_ARG0_REGNUM); - catch_addr = read_register (HPPA_ARG1_REGNUM); - - /* Now go down to a user frame */ - /* For a throw, __d_eh_break is called by - __d_eh_notify_callback which is called by - __notify_throw which is called - from user code. - For a catch, __d_eh_break is called by - __d_eh_notify_callback which is called by - <stackwalking stuff> which is called by - __throw__<stuff> or __rethrow_<stuff> which is called - from user code. */ - /* FIXME: Don't use such magic numbers; search for the frames */ - level = (event_kind == EX_EVENT_THROW) ? 3 : 4; - fi = find_relative_frame (curr_frame, &level); - if (level != 0) - return (struct exception_event_record *) NULL; - - select_frame (fi); - throw_addr = get_frame_pc (fi); - - /* Go back to original (top) frame */ - select_frame (curr_frame); - - current_ex_event.kind = (enum exception_event_kind) event_kind; - current_ex_event.throw_sal = find_pc_line (throw_addr, 1); - current_ex_event.catch_sal = find_pc_line (catch_addr, 1); - - return ¤t_ex_event; -} /* Signal frames. */ struct hppa_hpux_sigtramp_unwind_cache @@ -1967,15 +1403,6 @@ hppa_hpux_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) } -static void -hppa_hpux_inferior_created (struct target_ops *objfile, int from_tty) -{ - /* Some HP-UX related globals to clear when a new "main" - symbol file is loaded. HP-specific. */ - deprecated_hp_som_som_object_present = 0; - hp_cxx_exception_support_initialized = 0; -} - /* Given the current value of the pc, check to see if it is inside a stub, and if so, change the value of the pc to point to the caller of the stub. NEXT_FRAME is the next frame in the current list of frames. @@ -2043,8 +1470,6 @@ hppa_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) (gdbarch, hppa_hpux_regset_from_core_section); frame_unwind_append_sniffer (gdbarch, hppa_hpux_sigtramp_unwind_sniffer); - - observer_attach_inferior_created (hppa_hpux_inferior_created); } static void |