c933f875f4
The "call" and "print" commands presently always run synchronously, in
the foreground, but GDB currently forgets to put the inferior's
terminal settings into effect while running them, on async-capable
targets, resulting in:
(gdb) print func ()
hello world
Program received signal SIGTTOU, Stopped (tty output).
0x000000373bceb8d0 in __libc_tcdrain (fd=1) at ../sysdeps/unix/sysv/linux/tcdrain.c:29
29 return INLINE_SYSCALL (ioctl, 3, fd, TCSBRK, 1);
The program being debugged was signaled while in a function called from GDB.
GDB remains in the frame where the signal was received.
To change this behavior use "set unwindonsignal on".
Evaluation of the expression containing the function
(func) will be abandoned.
When the function is done executing, GDB will silently stop.
(gdb)
That's because target_terminal_inferior skips actually doing anything
if running in the background, and, nothing is setting sync_execution
while running infcalls:
void
target_terminal_inferior (void)
{
/* A background resume (``run&'') should leave GDB in control of the
terminal. Use target_can_async_p, not target_is_async_p, since at
this point the target is not async yet. However, if sync_execution
is not set, we know it will become async prior to resume. */
if (target_can_async_p () && !sync_execution)
return;
This would best be all cleaned up by making GDB not even call
target_terminal_inferior and try to pass the terminal to the inferior
if running in the background, but that's a more invasive fix that is
better done post-7.8.
This was originally caught by a patch later in this series that makes
catch_command_errors use exception_print instead of
print_any_exception. Note that print_flush calls serial_drain_output
while print_any_exception doesnt't have that bit. And,
gdb.gdb/python-selftest.exp does:
gdb_test "call catch_command_errors(execute_command, \"python print 5\", 0, RETURN_MASK_ALL)" \
"Python not initialized.* = 0"
which without this fix results in SIGTTOU...
gdb/
2014-07-14 Pedro Alves <palves@redhat.com>
* infcall.c (run_inferior_call): Set 'sync_execution' while
running the inferior call.
gdb/testsuite/
2014-07-14 Pedro Alves <palves@redhat.com>
* gdb.base/execution-termios.c: New file.
* gdb.base/execution-termios.exp: New file.
1149 lines
40 KiB
C
1149 lines
40 KiB
C
/* Perform an inferior function call, for GDB, the GNU debugger.
|
||
|
||
Copyright (C) 1986-2014 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 3 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, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "breakpoint.h"
|
||
#include "tracepoint.h"
|
||
#include "target.h"
|
||
#include "regcache.h"
|
||
#include "inferior.h"
|
||
#include "infrun.h"
|
||
#include "gdb_assert.h"
|
||
#include "block.h"
|
||
#include "gdbcore.h"
|
||
#include "language.h"
|
||
#include "objfiles.h"
|
||
#include "gdbcmd.h"
|
||
#include "command.h"
|
||
#include <string.h>
|
||
#include "infcall.h"
|
||
#include "dummy-frame.h"
|
||
#include "ada-lang.h"
|
||
#include "gdbthread.h"
|
||
#include "exceptions.h"
|
||
#include "event-top.h"
|
||
|
||
/* If we can't find a function's name from its address,
|
||
we print this instead. */
|
||
#define RAW_FUNCTION_ADDRESS_FORMAT "at 0x%s"
|
||
#define RAW_FUNCTION_ADDRESS_SIZE (sizeof (RAW_FUNCTION_ADDRESS_FORMAT) \
|
||
+ 2 * sizeof (CORE_ADDR))
|
||
|
||
/* NOTE: cagney/2003-04-16: What's the future of this code?
|
||
|
||
GDB needs an asynchronous expression evaluator, that means an
|
||
asynchronous inferior function call implementation, and that in
|
||
turn means restructuring the code so that it is event driven. */
|
||
|
||
/* How you should pass arguments to a function depends on whether it
|
||
was defined in K&R style or prototype style. If you define a
|
||
function using the K&R syntax that takes a `float' argument, then
|
||
callers must pass that argument as a `double'. If you define the
|
||
function using the prototype syntax, then you must pass the
|
||
argument as a `float', with no promotion.
|
||
|
||
Unfortunately, on certain older platforms, the debug info doesn't
|
||
indicate reliably how each function was defined. A function type's
|
||
TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was
|
||
defined in prototype style. When calling a function whose
|
||
TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to
|
||
decide what to do.
|
||
|
||
For modern targets, it is proper to assume that, if the prototype
|
||
flag is clear, that can be trusted: `float' arguments should be
|
||
promoted to `double'. For some older targets, if the prototype
|
||
flag is clear, that doesn't tell us anything. The default is to
|
||
trust the debug information; the user can override this behavior
|
||
with "set coerce-float-to-double 0". */
|
||
|
||
static int coerce_float_to_double_p = 1;
|
||
static void
|
||
show_coerce_float_to_double_p (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file,
|
||
_("Coercion of floats to doubles "
|
||
"when calling functions is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
/* This boolean tells what gdb should do if a signal is received while
|
||
in a function called from gdb (call dummy). If set, gdb unwinds
|
||
the stack and restore the context to what as it was before the
|
||
call.
|
||
|
||
The default is to stop in the frame where the signal was received. */
|
||
|
||
static int unwind_on_signal_p = 0;
|
||
static void
|
||
show_unwind_on_signal_p (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file,
|
||
_("Unwinding of stack if a signal is "
|
||
"received while in a call dummy is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
/* This boolean tells what gdb should do if a std::terminate call is
|
||
made while in a function called from gdb (call dummy).
|
||
As the confines of a single dummy stack prohibit out-of-frame
|
||
handlers from handling a raised exception, and as out-of-frame
|
||
handlers are common in C++, this can lead to no handler being found
|
||
by the unwinder, and a std::terminate call. This is a false positive.
|
||
If set, gdb unwinds the stack and restores the context to what it
|
||
was before the call.
|
||
|
||
The default is to unwind the frame if a std::terminate call is
|
||
made. */
|
||
|
||
static int unwind_on_terminating_exception_p = 1;
|
||
|
||
static void
|
||
show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c,
|
||
const char *value)
|
||
|
||
{
|
||
fprintf_filtered (file,
|
||
_("Unwind stack if a C++ exception is "
|
||
"unhandled while in a call dummy is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
/* Perform the standard coercions that are specified
|
||
for arguments to be passed to C or Ada functions.
|
||
|
||
If PARAM_TYPE is non-NULL, it is the expected parameter type.
|
||
IS_PROTOTYPED is non-zero if the function declaration is prototyped.
|
||
SP is the stack pointer were additional data can be pushed (updating
|
||
its value as needed). */
|
||
|
||
static struct value *
|
||
value_arg_coerce (struct gdbarch *gdbarch, struct value *arg,
|
||
struct type *param_type, int is_prototyped, CORE_ADDR *sp)
|
||
{
|
||
const struct builtin_type *builtin = builtin_type (gdbarch);
|
||
struct type *arg_type = check_typedef (value_type (arg));
|
||
struct type *type
|
||
= param_type ? check_typedef (param_type) : arg_type;
|
||
|
||
/* Perform any Ada-specific coercion first. */
|
||
if (current_language->la_language == language_ada)
|
||
arg = ada_convert_actual (arg, type);
|
||
|
||
/* Force the value to the target if we will need its address. At
|
||
this point, we could allocate arguments on the stack instead of
|
||
calling malloc if we knew that their addresses would not be
|
||
saved by the called function. */
|
||
arg = value_coerce_to_target (arg);
|
||
|
||
switch (TYPE_CODE (type))
|
||
{
|
||
case TYPE_CODE_REF:
|
||
{
|
||
struct value *new_value;
|
||
|
||
if (TYPE_CODE (arg_type) == TYPE_CODE_REF)
|
||
return value_cast_pointers (type, arg, 0);
|
||
|
||
/* Cast the value to the reference's target type, and then
|
||
convert it back to a reference. This will issue an error
|
||
if the value was not previously in memory - in some cases
|
||
we should clearly be allowing this, but how? */
|
||
new_value = value_cast (TYPE_TARGET_TYPE (type), arg);
|
||
new_value = value_ref (new_value);
|
||
return new_value;
|
||
}
|
||
case TYPE_CODE_INT:
|
||
case TYPE_CODE_CHAR:
|
||
case TYPE_CODE_BOOL:
|
||
case TYPE_CODE_ENUM:
|
||
/* If we don't have a prototype, coerce to integer type if necessary. */
|
||
if (!is_prototyped)
|
||
{
|
||
if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int))
|
||
type = builtin->builtin_int;
|
||
}
|
||
/* Currently all target ABIs require at least the width of an integer
|
||
type for an argument. We may have to conditionalize the following
|
||
type coercion for future targets. */
|
||
if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_int))
|
||
type = builtin->builtin_int;
|
||
break;
|
||
case TYPE_CODE_FLT:
|
||
if (!is_prototyped && coerce_float_to_double_p)
|
||
{
|
||
if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin->builtin_double))
|
||
type = builtin->builtin_double;
|
||
else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin->builtin_double))
|
||
type = builtin->builtin_long_double;
|
||
}
|
||
break;
|
||
case TYPE_CODE_FUNC:
|
||
type = lookup_pointer_type (type);
|
||
break;
|
||
case TYPE_CODE_ARRAY:
|
||
/* Arrays are coerced to pointers to their first element, unless
|
||
they are vectors, in which case we want to leave them alone,
|
||
because they are passed by value. */
|
||
if (current_language->c_style_arrays)
|
||
if (!TYPE_VECTOR (type))
|
||
type = lookup_pointer_type (TYPE_TARGET_TYPE (type));
|
||
break;
|
||
case TYPE_CODE_UNDEF:
|
||
case TYPE_CODE_PTR:
|
||
case TYPE_CODE_STRUCT:
|
||
case TYPE_CODE_UNION:
|
||
case TYPE_CODE_VOID:
|
||
case TYPE_CODE_SET:
|
||
case TYPE_CODE_RANGE:
|
||
case TYPE_CODE_STRING:
|
||
case TYPE_CODE_ERROR:
|
||
case TYPE_CODE_MEMBERPTR:
|
||
case TYPE_CODE_METHODPTR:
|
||
case TYPE_CODE_METHOD:
|
||
case TYPE_CODE_COMPLEX:
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return value_cast (type, arg);
|
||
}
|
||
|
||
/* Return the return type of a function with its first instruction exactly at
|
||
the PC address. Return NULL otherwise. */
|
||
|
||
static struct type *
|
||
find_function_return_type (CORE_ADDR pc)
|
||
{
|
||
struct symbol *sym = find_pc_function (pc);
|
||
|
||
if (sym != NULL && BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) == pc
|
||
&& SYMBOL_TYPE (sym) != NULL)
|
||
return TYPE_TARGET_TYPE (SYMBOL_TYPE (sym));
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Determine a function's address and its return type from its value.
|
||
Calls error() if the function is not valid for calling. */
|
||
|
||
CORE_ADDR
|
||
find_function_addr (struct value *function, struct type **retval_type)
|
||
{
|
||
struct type *ftype = check_typedef (value_type (function));
|
||
struct gdbarch *gdbarch = get_type_arch (ftype);
|
||
struct type *value_type = NULL;
|
||
/* Initialize it just to avoid a GCC false warning. */
|
||
CORE_ADDR funaddr = 0;
|
||
|
||
/* If it's a member function, just look at the function
|
||
part of it. */
|
||
|
||
/* Determine address to call. */
|
||
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|
||
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
|
||
funaddr = value_address (function);
|
||
else if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
|
||
{
|
||
funaddr = value_as_address (function);
|
||
ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
|
||
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|
||
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
|
||
funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr,
|
||
¤t_target);
|
||
}
|
||
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|
||
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
|
||
{
|
||
value_type = TYPE_TARGET_TYPE (ftype);
|
||
|
||
if (TYPE_GNU_IFUNC (ftype))
|
||
{
|
||
funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr);
|
||
|
||
/* Skip querying the function symbol if no RETVAL_TYPE has been
|
||
asked for. */
|
||
if (retval_type)
|
||
value_type = find_function_return_type (funaddr);
|
||
}
|
||
}
|
||
else if (TYPE_CODE (ftype) == TYPE_CODE_INT)
|
||
{
|
||
/* Handle the case of functions lacking debugging info.
|
||
Their values are characters since their addresses are char. */
|
||
if (TYPE_LENGTH (ftype) == 1)
|
||
funaddr = value_as_address (value_addr (function));
|
||
else
|
||
{
|
||
/* Handle function descriptors lacking debug info. */
|
||
int found_descriptor = 0;
|
||
|
||
funaddr = 0; /* pacify "gcc -Werror" */
|
||
if (VALUE_LVAL (function) == lval_memory)
|
||
{
|
||
CORE_ADDR nfunaddr;
|
||
|
||
funaddr = value_as_address (value_addr (function));
|
||
nfunaddr = funaddr;
|
||
funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr,
|
||
¤t_target);
|
||
if (funaddr != nfunaddr)
|
||
found_descriptor = 1;
|
||
}
|
||
if (!found_descriptor)
|
||
/* Handle integer used as address of a function. */
|
||
funaddr = (CORE_ADDR) value_as_long (function);
|
||
}
|
||
}
|
||
else
|
||
error (_("Invalid data type for function to be called."));
|
||
|
||
if (retval_type != NULL)
|
||
*retval_type = value_type;
|
||
return funaddr + gdbarch_deprecated_function_start_offset (gdbarch);
|
||
}
|
||
|
||
/* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called
|
||
function returns to. */
|
||
|
||
static CORE_ADDR
|
||
push_dummy_code (struct gdbarch *gdbarch,
|
||
CORE_ADDR sp, CORE_ADDR funaddr,
|
||
struct value **args, int nargs,
|
||
struct type *value_type,
|
||
CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
|
||
struct regcache *regcache)
|
||
{
|
||
gdb_assert (gdbarch_push_dummy_code_p (gdbarch));
|
||
|
||
return gdbarch_push_dummy_code (gdbarch, sp, funaddr,
|
||
args, nargs, value_type, real_pc, bp_addr,
|
||
regcache);
|
||
}
|
||
|
||
/* Fetch the name of the function at FUNADDR.
|
||
This is used in printing an error message for call_function_by_hand.
|
||
BUF is used to print FUNADDR in hex if the function name cannot be
|
||
determined. It must be large enough to hold formatted result of
|
||
RAW_FUNCTION_ADDRESS_FORMAT. */
|
||
|
||
static const char *
|
||
get_function_name (CORE_ADDR funaddr, char *buf, int buf_size)
|
||
{
|
||
{
|
||
struct symbol *symbol = find_pc_function (funaddr);
|
||
|
||
if (symbol)
|
||
return SYMBOL_PRINT_NAME (symbol);
|
||
}
|
||
|
||
{
|
||
/* Try the minimal symbols. */
|
||
struct bound_minimal_symbol msymbol = lookup_minimal_symbol_by_pc (funaddr);
|
||
|
||
if (msymbol.minsym)
|
||
return MSYMBOL_PRINT_NAME (msymbol.minsym);
|
||
}
|
||
|
||
{
|
||
char *tmp = xstrprintf (_(RAW_FUNCTION_ADDRESS_FORMAT),
|
||
hex_string (funaddr));
|
||
|
||
gdb_assert (strlen (tmp) + 1 <= buf_size);
|
||
strcpy (buf, tmp);
|
||
xfree (tmp);
|
||
return buf;
|
||
}
|
||
}
|
||
|
||
/* Subroutine of call_function_by_hand to simplify it.
|
||
Start up the inferior and wait for it to stop.
|
||
Return the exception if there's an error, or an exception with
|
||
reason >= 0 if there's no error.
|
||
|
||
This is done inside a TRY_CATCH so the caller needn't worry about
|
||
thrown errors. The caller should rethrow if there's an error. */
|
||
|
||
static struct gdb_exception
|
||
run_inferior_call (struct thread_info *call_thread, CORE_ADDR real_pc)
|
||
{
|
||
volatile struct gdb_exception e;
|
||
int saved_in_infcall = call_thread->control.in_infcall;
|
||
ptid_t call_thread_ptid = call_thread->ptid;
|
||
int saved_sync_execution = sync_execution;
|
||
|
||
/* Infcalls run synchronously, in the foreground. */
|
||
if (target_can_async_p ())
|
||
sync_execution = 1;
|
||
|
||
call_thread->control.in_infcall = 1;
|
||
|
||
clear_proceed_status ();
|
||
|
||
disable_watchpoints_before_interactive_call_start ();
|
||
|
||
/* We want stop_registers, please... */
|
||
call_thread->control.proceed_to_finish = 1;
|
||
|
||
TRY_CATCH (e, RETURN_MASK_ALL)
|
||
{
|
||
int was_sync = sync_execution;
|
||
|
||
proceed (real_pc, GDB_SIGNAL_0, 0);
|
||
|
||
/* Inferior function calls are always synchronous, even if the
|
||
target supports asynchronous execution. Do here what
|
||
`proceed' itself does in sync mode. */
|
||
if (target_can_async_p ())
|
||
{
|
||
wait_for_inferior ();
|
||
normal_stop ();
|
||
/* If GDB was previously in sync execution mode, then ensure
|
||
that it remains so. normal_stop calls
|
||
async_enable_stdin, so reset it again here. In other
|
||
cases, stdin will be re-enabled by
|
||
inferior_event_handler, when an exception is thrown. */
|
||
if (was_sync)
|
||
async_disable_stdin ();
|
||
}
|
||
}
|
||
|
||
/* At this point the current thread may have changed. Refresh
|
||
CALL_THREAD as it could be invalid if its thread has exited. */
|
||
call_thread = find_thread_ptid (call_thread_ptid);
|
||
|
||
enable_watchpoints_after_interactive_call_stop ();
|
||
|
||
/* Call breakpoint_auto_delete on the current contents of the bpstat
|
||
of inferior call thread.
|
||
If all error()s out of proceed ended up calling normal_stop
|
||
(and perhaps they should; it already does in the special case
|
||
of error out of resume()), then we wouldn't need this. */
|
||
if (e.reason < 0)
|
||
{
|
||
if (call_thread != NULL)
|
||
breakpoint_auto_delete (call_thread->control.stop_bpstat);
|
||
}
|
||
|
||
if (call_thread != NULL)
|
||
call_thread->control.in_infcall = saved_in_infcall;
|
||
|
||
sync_execution = saved_sync_execution;
|
||
|
||
return e;
|
||
}
|
||
|
||
/* A cleanup function that calls delete_std_terminate_breakpoint. */
|
||
static void
|
||
cleanup_delete_std_terminate_breakpoint (void *ignore)
|
||
{
|
||
delete_std_terminate_breakpoint ();
|
||
}
|
||
|
||
/* All this stuff with a dummy frame may seem unnecessarily complicated
|
||
(why not just save registers in GDB?). The purpose of pushing a dummy
|
||
frame which looks just like a real frame is so that if you call a
|
||
function and then hit a breakpoint (get a signal, etc), "backtrace"
|
||
will look right. Whether the backtrace needs to actually show the
|
||
stack at the time the inferior function was called is debatable, but
|
||
it certainly needs to not display garbage. So if you are contemplating
|
||
making dummy frames be different from normal frames, consider that. */
|
||
|
||
/* Perform a function call in the inferior.
|
||
ARGS is a vector of values of arguments (NARGS of them).
|
||
FUNCTION is a value, the function to be called.
|
||
Returns a value representing what the function returned.
|
||
May fail to return, if a breakpoint or signal is hit
|
||
during the execution of the function.
|
||
|
||
ARGS is modified to contain coerced values. */
|
||
|
||
struct value *
|
||
call_function_by_hand (struct value *function, int nargs, struct value **args)
|
||
{
|
||
CORE_ADDR sp;
|
||
struct type *values_type, *target_values_type;
|
||
unsigned char struct_return = 0, hidden_first_param_p = 0;
|
||
CORE_ADDR struct_addr = 0;
|
||
struct infcall_control_state *inf_status;
|
||
struct cleanup *inf_status_cleanup;
|
||
struct infcall_suspend_state *caller_state;
|
||
CORE_ADDR funaddr;
|
||
CORE_ADDR real_pc;
|
||
struct type *ftype = check_typedef (value_type (function));
|
||
CORE_ADDR bp_addr;
|
||
struct frame_id dummy_id;
|
||
struct cleanup *args_cleanup;
|
||
struct frame_info *frame;
|
||
struct gdbarch *gdbarch;
|
||
struct cleanup *terminate_bp_cleanup;
|
||
ptid_t call_thread_ptid;
|
||
struct gdb_exception e;
|
||
char name_buf[RAW_FUNCTION_ADDRESS_SIZE];
|
||
|
||
if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
|
||
ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
|
||
|
||
if (!target_has_execution)
|
||
noprocess ();
|
||
|
||
if (get_traceframe_number () >= 0)
|
||
error (_("May not call functions while looking at trace frames."));
|
||
|
||
if (execution_direction == EXEC_REVERSE)
|
||
error (_("Cannot call functions in reverse mode."));
|
||
|
||
frame = get_current_frame ();
|
||
gdbarch = get_frame_arch (frame);
|
||
|
||
if (!gdbarch_push_dummy_call_p (gdbarch))
|
||
error (_("This target does not support function calls."));
|
||
|
||
/* A cleanup for the inferior status.
|
||
This is only needed while we're preparing the inferior function call. */
|
||
inf_status = save_infcall_control_state ();
|
||
inf_status_cleanup
|
||
= make_cleanup_restore_infcall_control_state (inf_status);
|
||
|
||
/* Save the caller's registers and other state associated with the
|
||
inferior itself so that they can be restored once the
|
||
callee returns. To allow nested calls the registers are (further
|
||
down) pushed onto a dummy frame stack. Include a cleanup (which
|
||
is tossed once the regcache has been pushed). */
|
||
caller_state = save_infcall_suspend_state ();
|
||
make_cleanup_restore_infcall_suspend_state (caller_state);
|
||
|
||
/* Ensure that the initial SP is correctly aligned. */
|
||
{
|
||
CORE_ADDR old_sp = get_frame_sp (frame);
|
||
|
||
if (gdbarch_frame_align_p (gdbarch))
|
||
{
|
||
sp = gdbarch_frame_align (gdbarch, old_sp);
|
||
/* NOTE: cagney/2003-08-13: Skip the "red zone". For some
|
||
ABIs, a function can use memory beyond the inner most stack
|
||
address. AMD64 called that region the "red zone". Skip at
|
||
least the "red zone" size before allocating any space on
|
||
the stack. */
|
||
if (gdbarch_inner_than (gdbarch, 1, 2))
|
||
sp -= gdbarch_frame_red_zone_size (gdbarch);
|
||
else
|
||
sp += gdbarch_frame_red_zone_size (gdbarch);
|
||
/* Still aligned? */
|
||
gdb_assert (sp == gdbarch_frame_align (gdbarch, sp));
|
||
/* NOTE: cagney/2002-09-18:
|
||
|
||
On a RISC architecture, a void parameterless generic dummy
|
||
frame (i.e., no parameters, no result) typically does not
|
||
need to push anything the stack and hence can leave SP and
|
||
FP. Similarly, a frameless (possibly leaf) function does
|
||
not push anything on the stack and, hence, that too can
|
||
leave FP and SP unchanged. As a consequence, a sequence of
|
||
void parameterless generic dummy frame calls to frameless
|
||
functions will create a sequence of effectively identical
|
||
frames (SP, FP and TOS and PC the same). This, not
|
||
suprisingly, results in what appears to be a stack in an
|
||
infinite loop --- when GDB tries to find a generic dummy
|
||
frame on the internal dummy frame stack, it will always
|
||
find the first one.
|
||
|
||
To avoid this problem, the code below always grows the
|
||
stack. That way, two dummy frames can never be identical.
|
||
It does burn a few bytes of stack but that is a small price
|
||
to pay :-). */
|
||
if (sp == old_sp)
|
||
{
|
||
if (gdbarch_inner_than (gdbarch, 1, 2))
|
||
/* Stack grows down. */
|
||
sp = gdbarch_frame_align (gdbarch, old_sp - 1);
|
||
else
|
||
/* Stack grows up. */
|
||
sp = gdbarch_frame_align (gdbarch, old_sp + 1);
|
||
}
|
||
/* SP may have underflown address zero here from OLD_SP. Memory access
|
||
functions will probably fail in such case but that is a target's
|
||
problem. */
|
||
}
|
||
else
|
||
/* FIXME: cagney/2002-09-18: Hey, you loose!
|
||
|
||
Who knows how badly aligned the SP is!
|
||
|
||
If the generic dummy frame ends up empty (because nothing is
|
||
pushed) GDB won't be able to correctly perform back traces.
|
||
If a target is having trouble with backtraces, first thing to
|
||
do is add FRAME_ALIGN() to the architecture vector. If that
|
||
fails, try dummy_id().
|
||
|
||
If the ABI specifies a "Red Zone" (see the doco) the code
|
||
below will quietly trash it. */
|
||
sp = old_sp;
|
||
}
|
||
|
||
funaddr = find_function_addr (function, &values_type);
|
||
if (!values_type)
|
||
values_type = builtin_type (gdbarch)->builtin_int;
|
||
|
||
CHECK_TYPEDEF (values_type);
|
||
|
||
/* Are we returning a value using a structure return (passing a
|
||
hidden argument pointing to storage) or a normal value return?
|
||
There are two cases: language-mandated structure return and
|
||
target ABI structure return. The variable STRUCT_RETURN only
|
||
describes the latter. The language version is handled by passing
|
||
the return location as the first parameter to the function,
|
||
even preceding "this". This is different from the target
|
||
ABI version, which is target-specific; for instance, on ia64
|
||
the first argument is passed in out0 but the hidden structure
|
||
return pointer would normally be passed in r8. */
|
||
|
||
if (gdbarch_return_in_first_hidden_param_p (gdbarch, values_type))
|
||
{
|
||
hidden_first_param_p = 1;
|
||
|
||
/* Tell the target specific argument pushing routine not to
|
||
expect a value. */
|
||
target_values_type = builtin_type (gdbarch)->builtin_void;
|
||
}
|
||
else
|
||
{
|
||
struct_return = using_struct_return (gdbarch, function, values_type);
|
||
target_values_type = values_type;
|
||
}
|
||
|
||
/* Determine the location of the breakpoint (and possibly other
|
||
stuff) that the called function will return to. The SPARC, for a
|
||
function returning a structure or union, needs to make space for
|
||
not just the breakpoint but also an extra word containing the
|
||
size (?) of the structure being passed. */
|
||
|
||
switch (gdbarch_call_dummy_location (gdbarch))
|
||
{
|
||
case ON_STACK:
|
||
{
|
||
const gdb_byte *bp_bytes;
|
||
CORE_ADDR bp_addr_as_address;
|
||
int bp_size;
|
||
|
||
/* Be careful BP_ADDR is in inferior PC encoding while
|
||
BP_ADDR_AS_ADDRESS is a plain memory address. */
|
||
|
||
sp = push_dummy_code (gdbarch, sp, funaddr, args, nargs,
|
||
target_values_type, &real_pc, &bp_addr,
|
||
get_current_regcache ());
|
||
|
||
/* Write a legitimate instruction at the point where the infcall
|
||
breakpoint is going to be inserted. While this instruction
|
||
is never going to be executed, a user investigating the
|
||
memory from GDB would see this instruction instead of random
|
||
uninitialized bytes. We chose the breakpoint instruction
|
||
as it may look as the most logical one to the user and also
|
||
valgrind 3.7.0 needs it for proper vgdb inferior calls.
|
||
|
||
If software breakpoints are unsupported for this target we
|
||
leave the user visible memory content uninitialized. */
|
||
|
||
bp_addr_as_address = bp_addr;
|
||
bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address,
|
||
&bp_size);
|
||
if (bp_bytes != NULL)
|
||
write_memory (bp_addr_as_address, bp_bytes, bp_size);
|
||
}
|
||
break;
|
||
case AT_ENTRY_POINT:
|
||
{
|
||
CORE_ADDR dummy_addr;
|
||
|
||
real_pc = funaddr;
|
||
dummy_addr = entry_point_address ();
|
||
|
||
/* A call dummy always consists of just a single breakpoint, so
|
||
its address is the same as the address of the dummy.
|
||
|
||
The actual breakpoint is inserted separatly so there is no need to
|
||
write that out. */
|
||
bp_addr = dummy_addr;
|
||
break;
|
||
}
|
||
default:
|
||
internal_error (__FILE__, __LINE__, _("bad switch"));
|
||
}
|
||
|
||
if (nargs < TYPE_NFIELDS (ftype))
|
||
error (_("Too few arguments in function call."));
|
||
|
||
{
|
||
int i;
|
||
|
||
for (i = nargs - 1; i >= 0; i--)
|
||
{
|
||
int prototyped;
|
||
struct type *param_type;
|
||
|
||
/* FIXME drow/2002-05-31: Should just always mark methods as
|
||
prototyped. Can we respect TYPE_VARARGS? Probably not. */
|
||
if (TYPE_CODE (ftype) == TYPE_CODE_METHOD)
|
||
prototyped = 1;
|
||
else if (i < TYPE_NFIELDS (ftype))
|
||
prototyped = TYPE_PROTOTYPED (ftype);
|
||
else
|
||
prototyped = 0;
|
||
|
||
if (i < TYPE_NFIELDS (ftype))
|
||
param_type = TYPE_FIELD_TYPE (ftype, i);
|
||
else
|
||
param_type = NULL;
|
||
|
||
args[i] = value_arg_coerce (gdbarch, args[i],
|
||
param_type, prototyped, &sp);
|
||
|
||
if (param_type != NULL && language_pass_by_reference (param_type))
|
||
args[i] = value_addr (args[i]);
|
||
}
|
||
}
|
||
|
||
/* Reserve space for the return structure to be written on the
|
||
stack, if necessary. Make certain that the value is correctly
|
||
aligned. */
|
||
|
||
if (struct_return || hidden_first_param_p)
|
||
{
|
||
if (gdbarch_inner_than (gdbarch, 1, 2))
|
||
{
|
||
/* Stack grows downward. Align STRUCT_ADDR and SP after
|
||
making space for the return value. */
|
||
sp -= TYPE_LENGTH (values_type);
|
||
if (gdbarch_frame_align_p (gdbarch))
|
||
sp = gdbarch_frame_align (gdbarch, sp);
|
||
struct_addr = sp;
|
||
}
|
||
else
|
||
{
|
||
/* Stack grows upward. Align the frame, allocate space, and
|
||
then again, re-align the frame??? */
|
||
if (gdbarch_frame_align_p (gdbarch))
|
||
sp = gdbarch_frame_align (gdbarch, sp);
|
||
struct_addr = sp;
|
||
sp += TYPE_LENGTH (values_type);
|
||
if (gdbarch_frame_align_p (gdbarch))
|
||
sp = gdbarch_frame_align (gdbarch, sp);
|
||
}
|
||
}
|
||
|
||
if (hidden_first_param_p)
|
||
{
|
||
struct value **new_args;
|
||
|
||
/* Add the new argument to the front of the argument list. */
|
||
new_args = xmalloc (sizeof (struct value *) * (nargs + 1));
|
||
new_args[0] = value_from_pointer (lookup_pointer_type (values_type),
|
||
struct_addr);
|
||
memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs);
|
||
args = new_args;
|
||
nargs++;
|
||
args_cleanup = make_cleanup (xfree, args);
|
||
}
|
||
else
|
||
args_cleanup = make_cleanup (null_cleanup, NULL);
|
||
|
||
/* Create the dummy stack frame. Pass in the call dummy address as,
|
||
presumably, the ABI code knows where, in the call dummy, the
|
||
return address should be pointed. */
|
||
sp = gdbarch_push_dummy_call (gdbarch, function, get_current_regcache (),
|
||
bp_addr, nargs, args,
|
||
sp, struct_return, struct_addr);
|
||
|
||
do_cleanups (args_cleanup);
|
||
|
||
/* Set up a frame ID for the dummy frame so we can pass it to
|
||
set_momentary_breakpoint. We need to give the breakpoint a frame
|
||
ID so that the breakpoint code can correctly re-identify the
|
||
dummy breakpoint. */
|
||
/* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL,
|
||
saved as the dummy-frame TOS, and used by dummy_id to form
|
||
the frame ID's stack address. */
|
||
dummy_id = frame_id_build (sp, bp_addr);
|
||
|
||
/* Create a momentary breakpoint at the return address of the
|
||
inferior. That way it breaks when it returns. */
|
||
|
||
{
|
||
struct breakpoint *bpt, *longjmp_b;
|
||
struct symtab_and_line sal;
|
||
|
||
init_sal (&sal); /* initialize to zeroes */
|
||
sal.pspace = current_program_space;
|
||
sal.pc = bp_addr;
|
||
sal.section = find_pc_overlay (sal.pc);
|
||
/* Sanity. The exact same SP value is returned by
|
||
PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by
|
||
dummy_id to form the frame ID's stack address. */
|
||
bpt = set_momentary_breakpoint (gdbarch, sal, dummy_id, bp_call_dummy);
|
||
|
||
/* set_momentary_breakpoint invalidates FRAME. */
|
||
frame = NULL;
|
||
|
||
bpt->disposition = disp_del;
|
||
gdb_assert (bpt->related_breakpoint == bpt);
|
||
|
||
longjmp_b = set_longjmp_breakpoint_for_call_dummy ();
|
||
if (longjmp_b)
|
||
{
|
||
/* Link BPT into the chain of LONGJMP_B. */
|
||
bpt->related_breakpoint = longjmp_b;
|
||
while (longjmp_b->related_breakpoint != bpt->related_breakpoint)
|
||
longjmp_b = longjmp_b->related_breakpoint;
|
||
longjmp_b->related_breakpoint = bpt;
|
||
}
|
||
}
|
||
|
||
/* Create a breakpoint in std::terminate.
|
||
If a C++ exception is raised in the dummy-frame, and the
|
||
exception handler is (normally, and expected to be) out-of-frame,
|
||
the default C++ handler will (wrongly) be called in an inferior
|
||
function call. This is wrong, as an exception can be normally
|
||
and legally handled out-of-frame. The confines of the dummy frame
|
||
prevent the unwinder from finding the correct handler (or any
|
||
handler, unless it is in-frame). The default handler calls
|
||
std::terminate. This will kill the inferior. Assert that
|
||
terminate should never be called in an inferior function
|
||
call. Place a momentary breakpoint in the std::terminate function
|
||
and if triggered in the call, rewind. */
|
||
if (unwind_on_terminating_exception_p)
|
||
set_std_terminate_breakpoint ();
|
||
|
||
/* Everything's ready, push all the info needed to restore the
|
||
caller (and identify the dummy-frame) onto the dummy-frame
|
||
stack. */
|
||
dummy_frame_push (caller_state, &dummy_id, inferior_ptid);
|
||
|
||
/* Discard both inf_status and caller_state cleanups.
|
||
From this point on we explicitly restore the associated state
|
||
or discard it. */
|
||
discard_cleanups (inf_status_cleanup);
|
||
|
||
/* Register a clean-up for unwind_on_terminating_exception_breakpoint. */
|
||
terminate_bp_cleanup = make_cleanup (cleanup_delete_std_terminate_breakpoint,
|
||
NULL);
|
||
|
||
/* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP -
|
||
If you're looking to implement asynchronous dummy-frames, then
|
||
just below is the place to chop this function in two.. */
|
||
|
||
/* TP is invalid after run_inferior_call returns, so enclose this
|
||
in a block so that it's only in scope during the time it's valid. */
|
||
{
|
||
struct thread_info *tp = inferior_thread ();
|
||
|
||
/* Save this thread's ptid, we need it later but the thread
|
||
may have exited. */
|
||
call_thread_ptid = tp->ptid;
|
||
|
||
/* Run the inferior until it stops. */
|
||
|
||
e = run_inferior_call (tp, real_pc);
|
||
}
|
||
|
||
/* Rethrow an error if we got one trying to run the inferior. */
|
||
|
||
if (e.reason < 0)
|
||
{
|
||
const char *name = get_function_name (funaddr,
|
||
name_buf, sizeof (name_buf));
|
||
|
||
discard_infcall_control_state (inf_status);
|
||
|
||
/* We could discard the dummy frame here if the program exited,
|
||
but it will get garbage collected the next time the program is
|
||
run anyway. */
|
||
|
||
switch (e.reason)
|
||
{
|
||
case RETURN_ERROR:
|
||
throw_error (e.error, _("%s\n\
|
||
An error occurred while in a function called from GDB.\n\
|
||
Evaluation of the expression containing the function\n\
|
||
(%s) will be abandoned.\n\
|
||
When the function is done executing, GDB will silently stop."),
|
||
e.message, name);
|
||
case RETURN_QUIT:
|
||
default:
|
||
throw_exception (e);
|
||
}
|
||
}
|
||
|
||
/* If the program has exited, or we stopped at a different thread,
|
||
exit and inform the user. */
|
||
|
||
if (! target_has_execution)
|
||
{
|
||
const char *name = get_function_name (funaddr,
|
||
name_buf, sizeof (name_buf));
|
||
|
||
/* If we try to restore the inferior status,
|
||
we'll crash as the inferior is no longer running. */
|
||
discard_infcall_control_state (inf_status);
|
||
|
||
/* We could discard the dummy frame here given that the program exited,
|
||
but it will get garbage collected the next time the program is
|
||
run anyway. */
|
||
|
||
error (_("The program being debugged exited while in a function "
|
||
"called from GDB.\n"
|
||
"Evaluation of the expression containing the function\n"
|
||
"(%s) will be abandoned."),
|
||
name);
|
||
}
|
||
|
||
if (! ptid_equal (call_thread_ptid, inferior_ptid))
|
||
{
|
||
const char *name = get_function_name (funaddr,
|
||
name_buf, sizeof (name_buf));
|
||
|
||
/* We've switched threads. This can happen if another thread gets a
|
||
signal or breakpoint while our thread was running.
|
||
There's no point in restoring the inferior status,
|
||
we're in a different thread. */
|
||
discard_infcall_control_state (inf_status);
|
||
/* Keep the dummy frame record, if the user switches back to the
|
||
thread with the hand-call, we'll need it. */
|
||
if (stopped_by_random_signal)
|
||
error (_("\
|
||
The program received a signal in another thread while\n\
|
||
making a function call from GDB.\n\
|
||
Evaluation of the expression containing the function\n\
|
||
(%s) will be abandoned.\n\
|
||
When the function is done executing, GDB will silently stop."),
|
||
name);
|
||
else
|
||
error (_("\
|
||
The program stopped in another thread while making a function call from GDB.\n\
|
||
Evaluation of the expression containing the function\n\
|
||
(%s) will be abandoned.\n\
|
||
When the function is done executing, GDB will silently stop."),
|
||
name);
|
||
}
|
||
|
||
if (stopped_by_random_signal || stop_stack_dummy != STOP_STACK_DUMMY)
|
||
{
|
||
const char *name = get_function_name (funaddr,
|
||
name_buf, sizeof (name_buf));
|
||
|
||
if (stopped_by_random_signal)
|
||
{
|
||
/* We stopped inside the FUNCTION because of a random
|
||
signal. Further execution of the FUNCTION is not
|
||
allowed. */
|
||
|
||
if (unwind_on_signal_p)
|
||
{
|
||
/* The user wants the context restored. */
|
||
|
||
/* We must get back to the frame we were before the
|
||
dummy call. */
|
||
dummy_frame_pop (dummy_id, call_thread_ptid);
|
||
|
||
/* We also need to restore inferior status to that before the
|
||
dummy call. */
|
||
restore_infcall_control_state (inf_status);
|
||
|
||
/* FIXME: Insert a bunch of wrap_here; name can be very
|
||
long if it's a C++ name with arguments and stuff. */
|
||
error (_("\
|
||
The program being debugged was signaled while in a function called from GDB.\n\
|
||
GDB has restored the context to what it was before the call.\n\
|
||
To change this behavior use \"set unwindonsignal off\".\n\
|
||
Evaluation of the expression containing the function\n\
|
||
(%s) will be abandoned."),
|
||
name);
|
||
}
|
||
else
|
||
{
|
||
/* The user wants to stay in the frame where we stopped
|
||
(default).
|
||
Discard inferior status, we're not at the same point
|
||
we started at. */
|
||
discard_infcall_control_state (inf_status);
|
||
|
||
/* FIXME: Insert a bunch of wrap_here; name can be very
|
||
long if it's a C++ name with arguments and stuff. */
|
||
error (_("\
|
||
The program being debugged was signaled while in a function called from GDB.\n\
|
||
GDB remains in the frame where the signal was received.\n\
|
||
To change this behavior use \"set unwindonsignal on\".\n\
|
||
Evaluation of the expression containing the function\n\
|
||
(%s) will be abandoned.\n\
|
||
When the function is done executing, GDB will silently stop."),
|
||
name);
|
||
}
|
||
}
|
||
|
||
if (stop_stack_dummy == STOP_STD_TERMINATE)
|
||
{
|
||
/* We must get back to the frame we were before the dummy
|
||
call. */
|
||
dummy_frame_pop (dummy_id, call_thread_ptid);
|
||
|
||
/* We also need to restore inferior status to that before
|
||
the dummy call. */
|
||
restore_infcall_control_state (inf_status);
|
||
|
||
error (_("\
|
||
The program being debugged entered a std::terminate call, most likely\n\
|
||
caused by an unhandled C++ exception. GDB blocked this call in order\n\
|
||
to prevent the program from being terminated, and has restored the\n\
|
||
context to its original state before the call.\n\
|
||
To change this behaviour use \"set unwind-on-terminating-exception off\".\n\
|
||
Evaluation of the expression containing the function (%s)\n\
|
||
will be abandoned."),
|
||
name);
|
||
}
|
||
else if (stop_stack_dummy == STOP_NONE)
|
||
{
|
||
|
||
/* We hit a breakpoint inside the FUNCTION.
|
||
Keep the dummy frame, the user may want to examine its state.
|
||
Discard inferior status, we're not at the same point
|
||
we started at. */
|
||
discard_infcall_control_state (inf_status);
|
||
|
||
/* The following error message used to say "The expression
|
||
which contained the function call has been discarded."
|
||
It is a hard concept to explain in a few words. Ideally,
|
||
GDB would be able to resume evaluation of the expression
|
||
when the function finally is done executing. Perhaps
|
||
someday this will be implemented (it would not be easy). */
|
||
/* FIXME: Insert a bunch of wrap_here; name can be very long if it's
|
||
a C++ name with arguments and stuff. */
|
||
error (_("\
|
||
The program being debugged stopped while in a function called from GDB.\n\
|
||
Evaluation of the expression containing the function\n\
|
||
(%s) will be abandoned.\n\
|
||
When the function is done executing, GDB will silently stop."),
|
||
name);
|
||
}
|
||
|
||
/* The above code errors out, so ... */
|
||
internal_error (__FILE__, __LINE__, _("... should not be here"));
|
||
}
|
||
|
||
do_cleanups (terminate_bp_cleanup);
|
||
|
||
/* If we get here the called FUNCTION ran to completion,
|
||
and the dummy frame has already been popped. */
|
||
|
||
{
|
||
struct address_space *aspace = get_regcache_aspace (stop_registers);
|
||
struct regcache *retbuf = regcache_xmalloc (gdbarch, aspace);
|
||
struct cleanup *retbuf_cleanup = make_cleanup_regcache_xfree (retbuf);
|
||
struct value *retval = NULL;
|
||
|
||
regcache_cpy_no_passthrough (retbuf, stop_registers);
|
||
|
||
/* Inferior call is successful. Restore the inferior status.
|
||
At this stage, leave the RETBUF alone. */
|
||
restore_infcall_control_state (inf_status);
|
||
|
||
/* Figure out the value returned by the function. */
|
||
retval = allocate_value (values_type);
|
||
|
||
if (hidden_first_param_p)
|
||
read_value_memory (retval, 0, 1, struct_addr,
|
||
value_contents_raw (retval),
|
||
TYPE_LENGTH (values_type));
|
||
else if (TYPE_CODE (target_values_type) != TYPE_CODE_VOID)
|
||
{
|
||
/* If the function returns void, don't bother fetching the
|
||
return value. */
|
||
switch (gdbarch_return_value (gdbarch, function, target_values_type,
|
||
NULL, NULL, NULL))
|
||
{
|
||
case RETURN_VALUE_REGISTER_CONVENTION:
|
||
case RETURN_VALUE_ABI_RETURNS_ADDRESS:
|
||
case RETURN_VALUE_ABI_PRESERVES_ADDRESS:
|
||
gdbarch_return_value (gdbarch, function, values_type,
|
||
retbuf, value_contents_raw (retval), NULL);
|
||
break;
|
||
case RETURN_VALUE_STRUCT_CONVENTION:
|
||
read_value_memory (retval, 0, 1, struct_addr,
|
||
value_contents_raw (retval),
|
||
TYPE_LENGTH (values_type));
|
||
break;
|
||
}
|
||
}
|
||
|
||
do_cleanups (retbuf_cleanup);
|
||
|
||
gdb_assert (retval);
|
||
return retval;
|
||
}
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_infcall (void);
|
||
|
||
void
|
||
_initialize_infcall (void)
|
||
{
|
||
add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure,
|
||
&coerce_float_to_double_p, _("\
|
||
Set coercion of floats to doubles when calling functions."), _("\
|
||
Show coercion of floats to doubles when calling functions"), _("\
|
||
Variables of type float should generally be converted to doubles before\n\
|
||
calling an unprototyped function, and left alone when calling a prototyped\n\
|
||
function. However, some older debug info formats do not provide enough\n\
|
||
information to determine that a function is prototyped. If this flag is\n\
|
||
set, GDB will perform the conversion for a function it considers\n\
|
||
unprototyped.\n\
|
||
The default is to perform the conversion.\n"),
|
||
NULL,
|
||
show_coerce_float_to_double_p,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_boolean_cmd ("unwindonsignal", no_class,
|
||
&unwind_on_signal_p, _("\
|
||
Set unwinding of stack if a signal is received while in a call dummy."), _("\
|
||
Show unwinding of stack if a signal is received while in a call dummy."), _("\
|
||
The unwindonsignal lets the user determine what gdb should do if a signal\n\
|
||
is received while in a function called from gdb (call dummy). If set, gdb\n\
|
||
unwinds the stack and restore the context to what as it was before the call.\n\
|
||
The default is to stop in the frame where the signal was received."),
|
||
NULL,
|
||
show_unwind_on_signal_p,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class,
|
||
&unwind_on_terminating_exception_p, _("\
|
||
Set unwinding of stack if std::terminate is called while in call dummy."), _("\
|
||
Show unwinding of stack if std::terminate() is called while in a call dummy."),
|
||
_("\
|
||
The unwind on terminating exception flag lets the user determine\n\
|
||
what gdb should do if a std::terminate() call is made from the\n\
|
||
default exception handler. If set, gdb unwinds the stack and restores\n\
|
||
the context to what it was before the call. If unset, gdb allows the\n\
|
||
std::terminate call to proceed.\n\
|
||
The default is to unwind the frame."),
|
||
NULL,
|
||
show_unwind_on_terminating_exception_p,
|
||
&setlist, &showlist);
|
||
|
||
}
|