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2004-04-06 Randolph Chung <tausq@debian.org>

Browse Source 
Committed by Andrew Cagney (mechanical change).
	* hppa-tdep.c: (args_for_find_stub, hp_som_som_object_present,
	exception_catchpoints_are_fragile, find_stub_with_shl_get,
	cover_find_stub_with_shl_get, initialize_hp_cxx_exception_support,
	child_enable_exception_callback, current_ex_event,
	null_symtab_and_line, child_get_current_exception_event,
	HP_ACC_EH_notify_hook, HP_ACC_EH_set_hook_value,
	HP_ACC_EH_notify_callback, HP_ACC_EH_break, HP_ACC_EH_catch_throw,
	HP_ACC_EH_catch_catch, __eh_notification, hp_cxx_exception_support,
	hp_cxx_exception_support_initialized, eh_notify_hook_addr,
	eh_notify_callback_addr, eh_break_addr, eh_catch_catch_addr,
	eh_catch_throw_addr, break_callback_sal, setup_d_pid_in_inferior):
	Move hpux-specific definitions ...
	* hppa-hpux-tdep.c: ... to here.
This commit is contained in:
Andrew Cagney
2004-04-06 15:30:19 +00:00
parent 3a515653dc
commit 4c02c60cb2
3 changed files with 588 additions and 568 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
gdb/ChangeLog
View File

@@ -1,3 +1,20 @@
2004-04-06 Randolph Chung <tausq@debian.org>
Committed by Andrew Cagney (mechanical change).
* hppa-tdep.c: (args_for_find_stub, hp_som_som_object_present,
exception_catchpoints_are_fragile, find_stub_with_shl_get,
cover_find_stub_with_shl_get, initialize_hp_cxx_exception_support,
child_enable_exception_callback, current_ex_event,
null_symtab_and_line, child_get_current_exception_event,
HP_ACC_EH_notify_hook, HP_ACC_EH_set_hook_value,
HP_ACC_EH_notify_callback, HP_ACC_EH_break, HP_ACC_EH_catch_throw,
HP_ACC_EH_catch_catch, __eh_notification, hp_cxx_exception_support,
hp_cxx_exception_support_initialized, eh_notify_hook_addr,
eh_notify_callback_addr, eh_break_addr, eh_catch_catch_addr,
eh_catch_throw_addr, break_callback_sal, setup_d_pid_in_inferior):
Move hpux-specific definitions ...
* hppa-hpux-tdep.c: ... to here.
2004-04-05 Andrew Cagney <cagney@redhat.com>
* hppa-tdep.c (hppa_frame_cache): Pass the frame's func to

571
gdb/hppa-hpux-tdep.c
View File

@@ -24,11 +24,32 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "osabi.h"
#include "gdb_string.h"
#include "frame.h"
#include "symtab.h"
#include "objfiles.h"
#include "inferior.h"
#include "infcall.h"
#include <dl.h>
#include <machine/save_state.h>
/* Forward declarations. */
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;
/* This is declared in symtab.c; set to 1 in hp-symtab-read.c */
extern int hp_som_som_object_present;
/* In breakpoint.c */
extern int exception_catchpoints_are_fragile;
/* FIXME: brobecker 2002-12-25. The following functions will eventually
become static, after the multiarching conversion is done. */
int hppa_hpux_pc_in_sigtramp (CORE_ADDR pc, char *name);
@@ -148,6 +169,556 @@ hppa64_hpux_frame_find_saved_regs_in_sigtramp (struct frame_info *fi,
}
}
/* 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? */
int hp_cxx_exception_support_initialized = 0;
/* Similar to above, but imported from breakpoint.c -- non-target-specific */
extern int exception_support_initialized;
/* 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 */
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.");
warning ("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");
warning ("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 */
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), 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;
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 (!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).", HP_ACC_EH_notify_hook);
warning ("Executable may not have been compiled debuggable with HP aCC.");
warning ("GDB will be unable to intercept exception events.");
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).", HP_ACC_EH_notify_callback);
warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
warning ("GDB will be unable to intercept exception events.");
eh_notify_callback_addr = 0;
return 0;
}
#ifndef GDB_TARGET_IS_HPPA_20W
/* 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;
static char message[] = "Error while finding exception callback hook:\n";
args.solib_handle = som_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, message,
RETURN_MASK_ALL);
eh_notify_callback_addr = args.return_val;
recurse--;
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.");
warning ("GDB will not be able to intercept exception events.");
return 0;
}
}
else
exception_catchpoints_are_fragile = 0;
#endif
/* 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).", HP_ACC_EH_break);
warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
warning ("GDB will be unable to intercept exception events.");
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.");
warning ("Executable may not have been compiled debuggable with HP aCC.");
warning ("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.");
warning ("Executable may not have been compiled debuggable with HP aCC.");
warning ("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;
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 (!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.");
warning ("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 = (struct symtab_and_line *) xmalloc (sizeof (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;
/* Convenience struct */
static struct symtab_and_line null_symtab_and_line =
{NULL, 0, 0, 0};
/* 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 (ARG0_REGNUM);
catch_addr = read_register (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 &current_ex_event;
}
static void
hppa_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{

568
gdb/hppa-tdep.c
View File

@@ -48,12 +48,10 @@
#include <sys/types.h>
#endif
#include <dl.h>
#include <sys/param.h>
#include <signal.h>
#include <sys/ptrace.h>
#include <machine/save_state.h>
#ifdef COFF_ENCAPSULATE
#include "a.out.encap.h"
@@ -152,24 +150,8 @@ CORE_ADDR hppa_smash_text_address (CORE_ADDR addr);
CORE_ADDR hppa_target_read_pc (ptid_t ptid);
void hppa_target_write_pc (CORE_ADDR v, ptid_t ptid);
typedef struct
{
struct minimal_symbol *msym;
CORE_ADDR solib_handle;
CORE_ADDR return_val;
}
args_for_find_stub;
static int cover_find_stub_with_shl_get (void *);
static int is_pa_2 = 0; /* False */
/* This is declared in symtab.c; set to 1 in hp-symtab-read.c */
extern int hp_som_som_object_present;
/* In breakpoint.c */
extern int exception_catchpoints_are_fragile;
/* Handle 32/64-bit struct return conventions. */
static enum return_value_convention
@@ -1058,102 +1040,6 @@ hppa64_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
}
/* 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 */
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), 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;
}
/* Get the PC from %r31 if currently in a syscall. Also mask out privilege
bits. */
@@ -2494,460 +2380,6 @@ hppa_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
return frame_unwind_register_signed (next_frame, PCOQ_HEAD_REGNUM) & ~3;
}
/* 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? */
int hp_cxx_exception_support_initialized = 0;
/* Similar to above, but imported from breakpoint.c -- non-target-specific */
extern int exception_support_initialized;
/* 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 */
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.");
warning ("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");
warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
return 1;
}
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;
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 (!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).", HP_ACC_EH_notify_hook);
warning ("Executable may not have been compiled debuggable with HP aCC.");
warning ("GDB will be unable to intercept exception events.");
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).", HP_ACC_EH_notify_callback);
warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
warning ("GDB will be unable to intercept exception events.");
eh_notify_callback_addr = 0;
return 0;
}
#ifndef GDB_TARGET_IS_HPPA_20W
/* 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;
static char message[] = "Error while finding exception callback hook:\n";
args.solib_handle = som_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, message,
RETURN_MASK_ALL);
eh_notify_callback_addr = args.return_val;
recurse--;
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.");
warning ("GDB will not be able to intercept exception events.");
return 0;
}
}
else
exception_catchpoints_are_fragile = 0;
#endif
/* 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).", HP_ACC_EH_break);
warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
warning ("GDB will be unable to intercept exception events.");
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.");
warning ("Executable may not have been compiled debuggable with HP aCC.");
warning ("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.");
warning ("Executable may not have been compiled debuggable with HP aCC.");
warning ("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;
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 (!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.");
warning ("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 = (struct symtab_and_line *) xmalloc (sizeof (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;
/* Convenience struct */
static struct symtab_and_line null_symtab_and_line =
{NULL, 0, 0, 0};
/* 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 (ARG0_REGNUM);
catch_addr = read_register (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 &current_ex_event;
}
/* Instead of this nasty cast, add a method pvoid() that prints out a
host VOID data type (remember %p isn't portable). */