mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-01 16:35:04 +00:00
00d3340373
* hppa-tdep.c (hppa_value_returned_from_stack): Delete function. * config/pa/tm-hppa.h (hppa_value_returned_from_stack): Delete declaration. (DEPRECATED_VALUE_RETURNED_FROM_STACK): Delete macro. * infcall.c (call_function_by_hand): Delete #ifdef DEPRECATED_VALUE_RETURNED_FROM_STACK code. * infcmd.c (print_return_value): Ditto.
1141 lines
42 KiB
C
1141 lines
42 KiB
C
/* Perform an inferior function call, for GDB, the GNU debugger.
|
|
|
|
Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
|
|
1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
|
|
Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include "defs.h"
|
|
#include "breakpoint.h"
|
|
#include "target.h"
|
|
#include "regcache.h"
|
|
#include "inferior.h"
|
|
#include "gdb_assert.h"
|
|
#include "block.h"
|
|
#include "gdbcore.h"
|
|
#include "language.h"
|
|
#include "symfile.h"
|
|
#include "gdbcmd.h"
|
|
#include "command.h"
|
|
#include "gdb_string.h"
|
|
#include "infcall.h"
|
|
|
|
/* 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;
|
|
|
|
/* 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. */
|
|
|
|
int unwind_on_signal_p = 0;
|
|
|
|
/* Perform the standard coercions that are specified
|
|
for arguments to be passed to C functions.
|
|
|
|
If PARAM_TYPE is non-NULL, it is the expected parameter type.
|
|
IS_PROTOTYPED is non-zero if the function declaration is prototyped. */
|
|
|
|
static struct value *
|
|
value_arg_coerce (struct value *arg, struct type *param_type,
|
|
int is_prototyped)
|
|
{
|
|
struct type *arg_type = check_typedef (VALUE_TYPE (arg));
|
|
struct type *type
|
|
= param_type ? check_typedef (param_type) : arg_type;
|
|
|
|
switch (TYPE_CODE (type))
|
|
{
|
|
case TYPE_CODE_REF:
|
|
if (TYPE_CODE (arg_type) != TYPE_CODE_REF
|
|
&& TYPE_CODE (arg_type) != TYPE_CODE_PTR)
|
|
{
|
|
arg = value_addr (arg);
|
|
VALUE_TYPE (arg) = param_type;
|
|
return arg;
|
|
}
|
|
break;
|
|
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_type_int))
|
|
type = builtin_type_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_type_int))
|
|
type = builtin_type_int;
|
|
break;
|
|
case TYPE_CODE_FLT:
|
|
if (!is_prototyped && coerce_float_to_double_p)
|
|
{
|
|
if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_double))
|
|
type = builtin_type_double;
|
|
else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin_type_double))
|
|
type = builtin_type_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_BITSTRING:
|
|
case TYPE_CODE_ERROR:
|
|
case TYPE_CODE_MEMBER:
|
|
case TYPE_CODE_METHOD:
|
|
case TYPE_CODE_COMPLEX:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return value_cast (type, arg);
|
|
}
|
|
|
|
/* 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));
|
|
enum type_code code = TYPE_CODE (ftype);
|
|
struct type *value_type;
|
|
CORE_ADDR funaddr;
|
|
|
|
/* If it's a member function, just look at the function
|
|
part of it. */
|
|
|
|
/* Determine address to call. */
|
|
if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD)
|
|
{
|
|
funaddr = VALUE_ADDRESS (function);
|
|
value_type = TYPE_TARGET_TYPE (ftype);
|
|
}
|
|
else if (code == 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 (current_gdbarch,
|
|
funaddr,
|
|
¤t_target);
|
|
value_type = TYPE_TARGET_TYPE (ftype);
|
|
}
|
|
else
|
|
value_type = builtin_type_int;
|
|
}
|
|
else if (code == 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 integer used as address of a function. */
|
|
funaddr = (CORE_ADDR) value_as_long (function);
|
|
|
|
value_type = builtin_type_int;
|
|
}
|
|
else
|
|
error ("Invalid data type for function to be called.");
|
|
|
|
*retval_type = value_type;
|
|
return funaddr;
|
|
}
|
|
|
|
/* Call breakpoint_auto_delete on the current contents of the bpstat
|
|
pointed to by arg (which is really a bpstat *). */
|
|
|
|
static void
|
|
breakpoint_auto_delete_contents (void *arg)
|
|
{
|
|
breakpoint_auto_delete (*(bpstat *) arg);
|
|
}
|
|
|
|
static CORE_ADDR
|
|
legacy_push_dummy_code (struct gdbarch *gdbarch,
|
|
CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc,
|
|
struct value **args, int nargs,
|
|
struct type *value_type,
|
|
CORE_ADDR *real_pc, CORE_ADDR *bp_addr)
|
|
{
|
|
/* CALL_DUMMY is an array of words (DEPRECATED_REGISTER_SIZE), but
|
|
each word is in host byte order. Before calling
|
|
DEPRECATED_FIX_CALL_DUMMY, we byteswap it and remove any extra
|
|
bytes which might exist because ULONGEST is bigger than
|
|
DEPRECATED_REGISTER_SIZE. */
|
|
/* NOTE: This is pretty wierd, as the call dummy is actually a
|
|
sequence of instructions. But CISC machines will have to pack
|
|
the instructions into DEPRECATED_REGISTER_SIZE units (and so will
|
|
RISC machines for which INSTRUCTION_SIZE is not
|
|
DEPRECATED_REGISTER_SIZE). */
|
|
/* NOTE: This is pretty stupid. CALL_DUMMY should be in strict
|
|
target byte order. */
|
|
CORE_ADDR start_sp;
|
|
ULONGEST *dummy = alloca (DEPRECATED_SIZEOF_CALL_DUMMY_WORDS);
|
|
int sizeof_dummy1 = (DEPRECATED_REGISTER_SIZE
|
|
* DEPRECATED_SIZEOF_CALL_DUMMY_WORDS
|
|
/ sizeof (ULONGEST));
|
|
char *dummy1 = alloca (sizeof_dummy1);
|
|
memcpy (dummy, DEPRECATED_CALL_DUMMY_WORDS,
|
|
DEPRECATED_SIZEOF_CALL_DUMMY_WORDS);
|
|
if (INNER_THAN (1, 2))
|
|
{
|
|
/* Stack grows down */
|
|
sp -= sizeof_dummy1;
|
|
start_sp = sp;
|
|
}
|
|
else
|
|
{
|
|
/* Stack grows up */
|
|
start_sp = sp;
|
|
sp += sizeof_dummy1;
|
|
}
|
|
/* NOTE: cagney/2002-09-10: Don't bother re-adjusting the stack
|
|
after allocating space for the call dummy. A target can specify
|
|
a SIZEOF_DUMMY1 (via DEPRECATED_SIZEOF_CALL_DUMMY_WORDS) such
|
|
that all local alignment requirements are met. */
|
|
/* Create a call sequence customized for this function and the
|
|
number of arguments for it. */
|
|
{
|
|
int i;
|
|
for (i = 0; i < (int) (DEPRECATED_SIZEOF_CALL_DUMMY_WORDS / sizeof (dummy[0]));
|
|
i++)
|
|
store_unsigned_integer (&dummy1[i * DEPRECATED_REGISTER_SIZE],
|
|
DEPRECATED_REGISTER_SIZE,
|
|
(ULONGEST) dummy[i]);
|
|
}
|
|
/* NOTE: cagney/2003-04-22: This computation of REAL_PC, BP_ADDR and
|
|
DUMMY_ADDR is pretty messed up. It comes from constant tinkering
|
|
with the values. Instead a DEPRECATED_FIX_CALL_DUMMY replacement
|
|
(PUSH_DUMMY_BREAKPOINT?) should just do everything. */
|
|
#ifdef GDB_TARGET_IS_HPPA
|
|
(*real_pc) = DEPRECATED_FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs,
|
|
args, value_type, using_gcc);
|
|
#else
|
|
if (DEPRECATED_FIX_CALL_DUMMY_P ())
|
|
{
|
|
/* gdb_assert (CALL_DUMMY_LOCATION == ON_STACK) true? */
|
|
DEPRECATED_FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args,
|
|
value_type, using_gcc);
|
|
}
|
|
(*real_pc) = start_sp;
|
|
#endif
|
|
/* Yes, the offset is applied to the real_pc and not the dummy addr.
|
|
Ulgh! Blame the HP/UX target. */
|
|
(*bp_addr) = (*real_pc) + DEPRECATED_CALL_DUMMY_BREAKPOINT_OFFSET;
|
|
/* Yes, the offset is applied to the real_pc and not the
|
|
dummy_addr. Ulgh! Blame the HP/UX target. */
|
|
(*real_pc) += DEPRECATED_CALL_DUMMY_START_OFFSET;
|
|
write_memory (start_sp, (char *) dummy1, sizeof_dummy1);
|
|
if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES)
|
|
generic_save_call_dummy_addr (start_sp, start_sp + sizeof_dummy1);
|
|
return sp;
|
|
}
|
|
|
|
static CORE_ADDR
|
|
generic_push_dummy_code (struct gdbarch *gdbarch,
|
|
CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc,
|
|
struct value **args, int nargs,
|
|
struct type *value_type,
|
|
CORE_ADDR *real_pc, CORE_ADDR *bp_addr)
|
|
{
|
|
/* Something here to findout the size of a breakpoint and then
|
|
allocate space for it on the stack. */
|
|
int bplen;
|
|
/* This code assumes frame align. */
|
|
gdb_assert (gdbarch_frame_align_p (gdbarch));
|
|
/* Force the stack's alignment. The intent is to ensure that the SP
|
|
is aligned to at least a breakpoint instruction's boundary. */
|
|
sp = gdbarch_frame_align (gdbarch, sp);
|
|
/* Allocate space for, and then position the breakpoint on the
|
|
stack. */
|
|
if (gdbarch_inner_than (gdbarch, 1, 2))
|
|
{
|
|
CORE_ADDR bppc = sp;
|
|
gdbarch_breakpoint_from_pc (gdbarch, &bppc, &bplen);
|
|
sp = gdbarch_frame_align (gdbarch, sp - bplen);
|
|
(*bp_addr) = sp;
|
|
/* Should the breakpoint size/location be re-computed here? */
|
|
}
|
|
else
|
|
{
|
|
(*bp_addr) = sp;
|
|
gdbarch_breakpoint_from_pc (gdbarch, bp_addr, &bplen);
|
|
sp = gdbarch_frame_align (gdbarch, sp + bplen);
|
|
}
|
|
/* Inferior resumes at the function entry point. */
|
|
(*real_pc) = funaddr;
|
|
return sp;
|
|
}
|
|
|
|
/* Provide backward compatibility. Once DEPRECATED_FIX_CALL_DUMMY is
|
|
eliminated, this can be simplified. */
|
|
|
|
static CORE_ADDR
|
|
push_dummy_code (struct gdbarch *gdbarch,
|
|
CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc,
|
|
struct value **args, int nargs,
|
|
struct type *value_type,
|
|
CORE_ADDR *real_pc, CORE_ADDR *bp_addr)
|
|
{
|
|
if (gdbarch_push_dummy_code_p (gdbarch))
|
|
return gdbarch_push_dummy_code (gdbarch, sp, funaddr, using_gcc,
|
|
args, nargs, value_type, real_pc, bp_addr);
|
|
else if (DEPRECATED_FIX_CALL_DUMMY_P ())
|
|
return legacy_push_dummy_code (gdbarch, sp, funaddr, using_gcc,
|
|
args, nargs, value_type, real_pc, bp_addr);
|
|
else
|
|
return generic_push_dummy_code (gdbarch, sp, funaddr, using_gcc,
|
|
args, nargs, value_type, real_pc, bp_addr);
|
|
}
|
|
|
|
/* 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;
|
|
CORE_ADDR dummy_addr;
|
|
struct type *value_type;
|
|
unsigned char struct_return;
|
|
CORE_ADDR struct_addr = 0;
|
|
struct regcache *retbuf;
|
|
struct cleanup *retbuf_cleanup;
|
|
struct inferior_status *inf_status;
|
|
struct cleanup *inf_status_cleanup;
|
|
CORE_ADDR funaddr;
|
|
int using_gcc; /* Set to version of gcc in use, or zero if not gcc */
|
|
CORE_ADDR real_pc;
|
|
struct type *ftype = check_typedef (SYMBOL_TYPE (function));
|
|
CORE_ADDR bp_addr;
|
|
|
|
if (!target_has_execution)
|
|
noprocess ();
|
|
|
|
/* Create a cleanup chain that contains the retbuf (buffer
|
|
containing the register values). This chain is create BEFORE the
|
|
inf_status chain so that the inferior status can cleaned up
|
|
(restored or discarded) without having the retbuf freed. */
|
|
retbuf = regcache_xmalloc (current_gdbarch);
|
|
retbuf_cleanup = make_cleanup_regcache_xfree (retbuf);
|
|
|
|
/* A cleanup for the inferior status. Create this AFTER the retbuf
|
|
so that this can be discarded or applied without interfering with
|
|
the regbuf. */
|
|
inf_status = save_inferior_status (1);
|
|
inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status);
|
|
|
|
if (DEPRECATED_PUSH_DUMMY_FRAME_P ())
|
|
{
|
|
/* DEPRECATED_PUSH_DUMMY_FRAME is responsible for saving the
|
|
inferior registers (and frame_pop() for restoring them). (At
|
|
least on most machines) they are saved on the stack in the
|
|
inferior. */
|
|
DEPRECATED_PUSH_DUMMY_FRAME;
|
|
}
|
|
else
|
|
{
|
|
/* FIXME: cagney/2003-02-26: Step zero of this little tinker is
|
|
to extract the generic dummy frame code from the architecture
|
|
vector. Hence this direct call.
|
|
|
|
A follow-on change is to modify this interface so that it takes
|
|
thread OR frame OR ptid as a parameter, and returns a dummy
|
|
frame handle. The handle can then be used further down as a
|
|
parameter to generic_save_dummy_frame_tos(). Hmm, thinking
|
|
about it, since everything is ment to be using generic dummy
|
|
frames, why not even use some of the dummy frame code to here -
|
|
do a regcache dup and then pass the duped regcache, along with
|
|
all the other stuff, at one single point.
|
|
|
|
In fact, you can even save the structure's return address in the
|
|
dummy frame and fix one of those nasty lost struct return edge
|
|
conditions. */
|
|
generic_push_dummy_frame ();
|
|
}
|
|
|
|
/* Ensure that the initial SP is correctly aligned. */
|
|
{
|
|
CORE_ADDR old_sp = read_sp ();
|
|
if (gdbarch_frame_align_p (current_gdbarch))
|
|
{
|
|
sp = gdbarch_frame_align (current_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 (INNER_THAN (1, 2))
|
|
sp -= gdbarch_frame_red_zone_size (current_gdbarch);
|
|
else
|
|
sp += gdbarch_frame_red_zone_size (current_gdbarch);
|
|
/* Still aligned? */
|
|
gdb_assert (sp == gdbarch_frame_align (current_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 (INNER_THAN (1, 2))
|
|
/* Stack grows down. */
|
|
sp = gdbarch_frame_align (current_gdbarch, old_sp - 1);
|
|
else
|
|
/* Stack grows up. */
|
|
sp = gdbarch_frame_align (current_gdbarch, old_sp + 1);
|
|
}
|
|
gdb_assert ((INNER_THAN (1, 2) && sp <= old_sp)
|
|
|| (INNER_THAN (2, 1) && sp >= old_sp));
|
|
}
|
|
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 unwind_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, &value_type);
|
|
CHECK_TYPEDEF (value_type);
|
|
|
|
{
|
|
struct block *b = block_for_pc (funaddr);
|
|
/* If compiled without -g, assume GCC 2. */
|
|
using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b));
|
|
}
|
|
|
|
/* Are we returning a value using a structure return or a normal
|
|
value return? */
|
|
|
|
struct_return = using_struct_return (value_type, using_gcc);
|
|
|
|
/* 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. */
|
|
|
|
/* The actual breakpoint (at BP_ADDR) is inserted separatly so there
|
|
is no need to write that out. */
|
|
|
|
switch (CALL_DUMMY_LOCATION)
|
|
{
|
|
case ON_STACK:
|
|
/* "dummy_addr" is here just to keep old targets happy. New
|
|
targets return that same information via "sp" and "bp_addr". */
|
|
if (INNER_THAN (1, 2))
|
|
{
|
|
sp = push_dummy_code (current_gdbarch, sp, funaddr,
|
|
using_gcc, args, nargs, value_type,
|
|
&real_pc, &bp_addr);
|
|
dummy_addr = sp;
|
|
}
|
|
else
|
|
{
|
|
dummy_addr = sp;
|
|
sp = push_dummy_code (current_gdbarch, sp, funaddr,
|
|
using_gcc, args, nargs, value_type,
|
|
&real_pc, &bp_addr);
|
|
}
|
|
break;
|
|
case AT_ENTRY_POINT:
|
|
if (DEPRECATED_FIX_CALL_DUMMY_P ())
|
|
{
|
|
/* Sigh. Some targets use DEPRECATED_FIX_CALL_DUMMY to
|
|
shove extra stuff onto the stack or into registers. That
|
|
code should be in PUSH_DUMMY_CALL, however, in the mean
|
|
time ... */
|
|
/* If the target is manipulating DUMMY1, it looses big time. */
|
|
void *dummy1 = NULL;
|
|
DEPRECATED_FIX_CALL_DUMMY (dummy1, sp, funaddr, nargs, args,
|
|
value_type, using_gcc);
|
|
}
|
|
real_pc = funaddr;
|
|
dummy_addr = entry_point_address ();
|
|
if (DEPRECATED_CALL_DUMMY_ADDRESS_P ())
|
|
/* Override it. */
|
|
dummy_addr = DEPRECATED_CALL_DUMMY_ADDRESS ();
|
|
/* Make certain that the address points at real code, and not a
|
|
function descriptor. */
|
|
dummy_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch,
|
|
dummy_addr,
|
|
¤t_target);
|
|
/* A call dummy always consists of just a single breakpoint, so
|
|
it's address is the same as the address of the dummy. */
|
|
bp_addr = dummy_addr;
|
|
break;
|
|
case AT_SYMBOL:
|
|
/* Some executables define a symbol __CALL_DUMMY_ADDRESS whose
|
|
address is the location where the breakpoint should be
|
|
placed. Once all targets are using the overhauled frame code
|
|
this can be deleted - ON_STACK is a better option. */
|
|
{
|
|
struct minimal_symbol *sym;
|
|
|
|
sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL);
|
|
real_pc = funaddr;
|
|
if (sym)
|
|
dummy_addr = SYMBOL_VALUE_ADDRESS (sym);
|
|
else
|
|
dummy_addr = entry_point_address ();
|
|
/* Make certain that the address points at real code, and not
|
|
a function descriptor. */
|
|
dummy_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch,
|
|
dummy_addr,
|
|
¤t_target);
|
|
/* A call dummy always consists of just a single breakpoint,
|
|
so it's address is the same as the address of the dummy. */
|
|
bp_addr = dummy_addr;
|
|
break;
|
|
}
|
|
default:
|
|
internal_error (__FILE__, __LINE__, "bad switch");
|
|
}
|
|
|
|
if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES)
|
|
/* Save where the breakpoint is going to be inserted so that the
|
|
dummy-frame code is later able to re-identify it. */
|
|
generic_save_call_dummy_addr (bp_addr, bp_addr + 1);
|
|
|
|
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 (args[i], param_type, prototyped);
|
|
|
|
/* elz: this code is to handle the case in which the function
|
|
to be called has a pointer to function as parameter and the
|
|
corresponding actual argument is the address of a function
|
|
and not a pointer to function variable. In aCC compiled
|
|
code, the calls through pointers to functions (in the body
|
|
of the function called by hand) are made via
|
|
$$dyncall_external which requires some registers setting,
|
|
this is taken care of if we call via a function pointer
|
|
variable, but not via a function address. In cc this is
|
|
not a problem. */
|
|
|
|
if (using_gcc == 0)
|
|
{
|
|
if (param_type != NULL && TYPE_CODE (ftype) != TYPE_CODE_METHOD)
|
|
{
|
|
/* if this parameter is a pointer to function. */
|
|
if (TYPE_CODE (param_type) == TYPE_CODE_PTR)
|
|
if (TYPE_CODE (TYPE_TARGET_TYPE (param_type)) == TYPE_CODE_FUNC)
|
|
/* elz: FIXME here should go the test about the
|
|
compiler used to compile the target. We want to
|
|
issue the error message only if the compiler
|
|
used was HP's aCC. If we used HP's cc, then
|
|
there is no problem and no need to return at
|
|
this point. */
|
|
/* Go see if the actual parameter is a variable of
|
|
type pointer to function or just a function. */
|
|
if (args[i]->lval == not_lval)
|
|
{
|
|
char *arg_name;
|
|
if (find_pc_partial_function ((CORE_ADDR) args[i]->aligner.contents[0], &arg_name, NULL, NULL))
|
|
error ("\
|
|
You cannot use function <%s> as argument. \n\
|
|
You must use a pointer to function type variable. Command ignored.", arg_name);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ())
|
|
{
|
|
int i;
|
|
/* This is a machine like the sparc, where we may need to pass a
|
|
pointer to the structure, not the structure itself. */
|
|
for (i = nargs - 1; i >= 0; i--)
|
|
{
|
|
struct type *arg_type = check_typedef (VALUE_TYPE (args[i]));
|
|
if ((TYPE_CODE (arg_type) == TYPE_CODE_STRUCT
|
|
|| TYPE_CODE (arg_type) == TYPE_CODE_UNION
|
|
|| TYPE_CODE (arg_type) == TYPE_CODE_ARRAY
|
|
|| TYPE_CODE (arg_type) == TYPE_CODE_STRING
|
|
|| TYPE_CODE (arg_type) == TYPE_CODE_BITSTRING
|
|
|| TYPE_CODE (arg_type) == TYPE_CODE_SET
|
|
|| (TYPE_CODE (arg_type) == TYPE_CODE_FLT
|
|
&& TYPE_LENGTH (arg_type) > 8)
|
|
)
|
|
&& DEPRECATED_REG_STRUCT_HAS_ADDR (using_gcc, arg_type))
|
|
{
|
|
CORE_ADDR addr;
|
|
int len; /* = TYPE_LENGTH (arg_type); */
|
|
int aligned_len;
|
|
arg_type = check_typedef (VALUE_ENCLOSING_TYPE (args[i]));
|
|
len = TYPE_LENGTH (arg_type);
|
|
|
|
if (DEPRECATED_STACK_ALIGN_P ())
|
|
/* MVS 11/22/96: I think at least some of this
|
|
stack_align code is really broken. Better to let
|
|
PUSH_ARGUMENTS adjust the stack in a target-defined
|
|
manner. */
|
|
aligned_len = DEPRECATED_STACK_ALIGN (len);
|
|
else
|
|
aligned_len = len;
|
|
if (INNER_THAN (1, 2))
|
|
{
|
|
/* stack grows downward */
|
|
sp -= aligned_len;
|
|
/* ... so the address of the thing we push is the
|
|
stack pointer after we push it. */
|
|
addr = sp;
|
|
}
|
|
else
|
|
{
|
|
/* The stack grows up, so the address of the thing
|
|
we push is the stack pointer before we push it. */
|
|
addr = sp;
|
|
sp += aligned_len;
|
|
}
|
|
/* Push the structure. */
|
|
write_memory (addr, VALUE_CONTENTS_ALL (args[i]), len);
|
|
/* The value we're going to pass is the address of the
|
|
thing we just pushed. */
|
|
/*args[i] = value_from_longest (lookup_pointer_type (value_type),
|
|
(LONGEST) addr); */
|
|
args[i] = value_from_pointer (lookup_pointer_type (arg_type),
|
|
addr);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* 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)
|
|
{
|
|
int len = TYPE_LENGTH (value_type);
|
|
if (DEPRECATED_STACK_ALIGN_P ())
|
|
/* NOTE: cagney/2003-03-22: Should rely on frame align, rather
|
|
than stack align to force the alignment of the stack. */
|
|
len = DEPRECATED_STACK_ALIGN (len);
|
|
if (INNER_THAN (1, 2))
|
|
{
|
|
/* Stack grows downward. Align STRUCT_ADDR and SP after
|
|
making space for the return value. */
|
|
sp -= len;
|
|
if (gdbarch_frame_align_p (current_gdbarch))
|
|
sp = gdbarch_frame_align (current_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 (current_gdbarch))
|
|
sp = gdbarch_frame_align (current_gdbarch, sp);
|
|
struct_addr = sp;
|
|
sp += len;
|
|
if (gdbarch_frame_align_p (current_gdbarch))
|
|
sp = gdbarch_frame_align (current_gdbarch, sp);
|
|
}
|
|
}
|
|
|
|
/* elz: on HPPA no need for this extra alignment, maybe it is needed
|
|
on other architectures. This is because all the alignment is
|
|
taken care of in the above code (ifdef DEPRECATED_REG_STRUCT_HAS_ADDR)
|
|
and in hppa_push_arguments */
|
|
/* NOTE: cagney/2003-03-24: The below code is very broken. Given an
|
|
odd sized parameter the below will mis-align the stack. As was
|
|
suggested back in '96, better to let PUSH_ARGUMENTS handle it. */
|
|
if (DEPRECATED_EXTRA_STACK_ALIGNMENT_NEEDED)
|
|
{
|
|
/* MVS 11/22/96: I think at least some of this stack_align code
|
|
is really broken. Better to let push_dummy_call() adjust the
|
|
stack in a target-defined manner. */
|
|
if (DEPRECATED_STACK_ALIGN_P () && INNER_THAN (1, 2))
|
|
{
|
|
/* If stack grows down, we must leave a hole at the top. */
|
|
int len = 0;
|
|
int i;
|
|
for (i = nargs - 1; i >= 0; i--)
|
|
len += TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[i]));
|
|
if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ())
|
|
len += DEPRECATED_CALL_DUMMY_STACK_ADJUST;
|
|
sp -= DEPRECATED_STACK_ALIGN (len) - len;
|
|
}
|
|
}
|
|
|
|
/* 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. */
|
|
if (gdbarch_push_dummy_call_p (current_gdbarch))
|
|
/* When there is no push_dummy_call method, should this code
|
|
simply error out. That would the implementation of this method
|
|
for all ABIs (which is probably a good thing). */
|
|
sp = gdbarch_push_dummy_call (current_gdbarch, funaddr, current_regcache,
|
|
bp_addr, nargs, args, sp, struct_return,
|
|
struct_addr);
|
|
else if (DEPRECATED_PUSH_ARGUMENTS_P ())
|
|
/* Keep old targets working. */
|
|
sp = DEPRECATED_PUSH_ARGUMENTS (nargs, args, sp, struct_return,
|
|
struct_addr);
|
|
else
|
|
sp = legacy_push_arguments (nargs, args, sp, struct_return, struct_addr);
|
|
|
|
if (DEPRECATED_PUSH_RETURN_ADDRESS_P ())
|
|
/* for targets that use no CALL_DUMMY */
|
|
/* There are a number of targets now which actually don't write
|
|
any CALL_DUMMY instructions into the target, but instead just
|
|
save the machine state, push the arguments, and jump directly
|
|
to the callee function. Since this doesn't actually involve
|
|
executing a JSR/BSR instruction, the return address must be set
|
|
up by hand, either by pushing onto the stack or copying into a
|
|
return-address register as appropriate. Formerly this has been
|
|
done in PUSH_ARGUMENTS, but that's overloading its
|
|
functionality a bit, so I'm making it explicit to do it here. */
|
|
/* NOTE: cagney/2003-04-22: The first parameter ("real_pc") has
|
|
been replaced with zero, it turns out that no implementation
|
|
used that parameter. This occured because the value being
|
|
supplied - the address of the called function's entry point
|
|
instead of the address of the breakpoint that the called
|
|
function should return to - wasn't useful. */
|
|
sp = DEPRECATED_PUSH_RETURN_ADDRESS (0, sp);
|
|
|
|
/* NOTE: cagney/2003-03-23: Diable this code when there is a
|
|
push_dummy_call() method. Since that method will have already
|
|
handled any alignment issues, the code below is entirely
|
|
redundant. */
|
|
if (!gdbarch_push_dummy_call_p (current_gdbarch)
|
|
&& DEPRECATED_STACK_ALIGN_P () && !INNER_THAN (1, 2))
|
|
{
|
|
/* If stack grows up, we must leave a hole at the bottom, note
|
|
that sp already has been advanced for the arguments! */
|
|
if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ())
|
|
sp += DEPRECATED_CALL_DUMMY_STACK_ADJUST;
|
|
sp = DEPRECATED_STACK_ALIGN (sp);
|
|
}
|
|
|
|
/* XXX This seems wrong. For stacks that grow down we shouldn't do
|
|
anything here! */
|
|
/* MVS 11/22/96: I think at least some of this stack_align code is
|
|
really broken. Better to let PUSH_ARGUMENTS adjust the stack in
|
|
a target-defined manner. */
|
|
if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ())
|
|
if (INNER_THAN (1, 2))
|
|
{
|
|
/* stack grows downward */
|
|
sp -= DEPRECATED_CALL_DUMMY_STACK_ADJUST;
|
|
}
|
|
|
|
/* Store the address at which the structure is supposed to be
|
|
written. */
|
|
/* NOTE: 2003-03-24: Since PUSH_ARGUMENTS can (and typically does)
|
|
store the struct return address, this call is entirely redundant. */
|
|
if (struct_return && DEPRECATED_STORE_STRUCT_RETURN_P ())
|
|
DEPRECATED_STORE_STRUCT_RETURN (struct_addr, sp);
|
|
|
|
/* Write the stack pointer. This is here because the statements
|
|
above might fool with it. On SPARC, this write also stores the
|
|
register window into the right place in the new stack frame,
|
|
which otherwise wouldn't happen (see store_inferior_registers in
|
|
sparc-nat.c). */
|
|
/* NOTE: cagney/2003-03-23: Since the architecture method
|
|
push_dummy_call() should have already stored the stack pointer
|
|
(as part of creating the fake call frame), and none of the code
|
|
following that call adjusts the stack-pointer value, the below
|
|
call is entirely redundant. */
|
|
if (DEPRECATED_DUMMY_WRITE_SP_P ())
|
|
DEPRECATED_DUMMY_WRITE_SP (sp);
|
|
|
|
if (gdbarch_unwind_dummy_id_p (current_gdbarch))
|
|
{
|
|
/* Sanity. The exact same SP value is returned by
|
|
PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by
|
|
unwind_dummy_id to form the frame ID's stack address. */
|
|
gdb_assert (DEPRECATED_USE_GENERIC_DUMMY_FRAMES);
|
|
generic_save_dummy_frame_tos (sp);
|
|
}
|
|
else if (DEPRECATED_SAVE_DUMMY_FRAME_TOS_P ())
|
|
DEPRECATED_SAVE_DUMMY_FRAME_TOS (sp);
|
|
|
|
/* Now proceed, having reached the desired place. */
|
|
clear_proceed_status ();
|
|
|
|
/* Create a momentary breakpoint at the return address of the
|
|
inferior. That way it breaks when it returns. */
|
|
|
|
{
|
|
struct breakpoint *bpt;
|
|
struct symtab_and_line sal;
|
|
struct frame_id frame;
|
|
init_sal (&sal); /* initialize to zeroes */
|
|
sal.pc = bp_addr;
|
|
sal.section = find_pc_overlay (sal.pc);
|
|
/* 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. */
|
|
if (gdbarch_unwind_dummy_id_p (current_gdbarch))
|
|
{
|
|
/* Sanity. The exact same SP value is returned by
|
|
PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by
|
|
unwind_dummy_id to form the frame ID's stack address. */
|
|
gdb_assert (DEPRECATED_USE_GENERIC_DUMMY_FRAMES);
|
|
frame = frame_id_build (sp, sal.pc);
|
|
}
|
|
else
|
|
{
|
|
/* The assumption here is that push_dummy_call() returned the
|
|
stack part of the frame ID. Unfortunately, many older
|
|
architectures were, via a convoluted mess, relying on the
|
|
poorly defined and greatly overloaded
|
|
DEPRECATED_TARGET_READ_FP or DEPRECATED_FP_REGNUM to supply
|
|
the value. */
|
|
if (DEPRECATED_TARGET_READ_FP_P ())
|
|
frame = frame_id_build (DEPRECATED_TARGET_READ_FP (), sal.pc);
|
|
else if (DEPRECATED_FP_REGNUM >= 0)
|
|
frame = frame_id_build (read_register (DEPRECATED_FP_REGNUM), sal.pc);
|
|
else
|
|
frame = frame_id_build (sp, sal.pc);
|
|
}
|
|
bpt = set_momentary_breakpoint (sal, frame, bp_call_dummy);
|
|
bpt->disposition = disp_del;
|
|
}
|
|
|
|
/* Execute a "stack dummy", a piece of code stored in the stack by
|
|
the debugger to be executed in the inferior.
|
|
|
|
The dummy's frame is automatically popped whenever that break is
|
|
hit. If that is the first time the program stops,
|
|
call_function_by_hand returns to its caller with that frame
|
|
already gone and sets RC to 0.
|
|
|
|
Otherwise, set RC to a non-zero value. If the called function
|
|
receives a random signal, we do not allow the user to continue
|
|
executing it as this may not work. The dummy frame is poped and
|
|
we return 1. If we hit a breakpoint, we leave the frame in place
|
|
and return 2 (the frame will eventually be popped when we do hit
|
|
the dummy end breakpoint). */
|
|
|
|
{
|
|
struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0);
|
|
int saved_async = 0;
|
|
|
|
/* 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. */
|
|
make_cleanup (breakpoint_auto_delete_contents, &stop_bpstat);
|
|
|
|
disable_watchpoints_before_interactive_call_start ();
|
|
proceed_to_finish = 1; /* We want stop_registers, please... */
|
|
|
|
if (target_can_async_p ())
|
|
saved_async = target_async_mask (0);
|
|
|
|
proceed (real_pc, TARGET_SIGNAL_0, 0);
|
|
|
|
if (saved_async)
|
|
target_async_mask (saved_async);
|
|
|
|
enable_watchpoints_after_interactive_call_stop ();
|
|
|
|
discard_cleanups (old_cleanups);
|
|
}
|
|
|
|
if (stopped_by_random_signal || !stop_stack_dummy)
|
|
{
|
|
/* Find the name of the function we're about to complain about. */
|
|
const char *name = NULL;
|
|
{
|
|
struct symbol *symbol = find_pc_function (funaddr);
|
|
if (symbol)
|
|
name = SYMBOL_PRINT_NAME (symbol);
|
|
else
|
|
{
|
|
/* Try the minimal symbols. */
|
|
struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr);
|
|
if (msymbol)
|
|
name = SYMBOL_PRINT_NAME (msymbol);
|
|
}
|
|
if (name == NULL)
|
|
{
|
|
/* Can't use a cleanup here. It is discarded, instead use
|
|
an alloca. */
|
|
char *tmp = xstrprintf ("at %s", local_hex_string (funaddr));
|
|
char *a = alloca (strlen (tmp) + 1);
|
|
strcpy (a, tmp);
|
|
xfree (tmp);
|
|
name = a;
|
|
}
|
|
}
|
|
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. */
|
|
frame_pop (get_current_frame ());
|
|
|
|
/* 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 (%s) will be abandoned.",
|
|
name);
|
|
}
|
|
else
|
|
{
|
|
/* The user wants to stay in the frame where we stopped
|
|
(default).*/
|
|
/* If we restored the inferior status (via the cleanup),
|
|
we would print a spurious error message (Unable to
|
|
restore previously selected frame), would write the
|
|
registers from the inf_status (which is wrong), and
|
|
would do other wrong things. */
|
|
discard_cleanups (inf_status_cleanup);
|
|
discard_inferior_status (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 (%s) will be abandoned.",
|
|
name);
|
|
}
|
|
}
|
|
|
|
if (!stop_stack_dummy)
|
|
{
|
|
/* We hit a breakpoint inside the FUNCTION. */
|
|
/* If we restored the inferior status (via the cleanup), we
|
|
would print a spurious error message (Unable to restore
|
|
previously selected frame), would write the registers
|
|
from the inf_status (which is wrong), and would do other
|
|
wrong things. */
|
|
discard_cleanups (inf_status_cleanup);
|
|
discard_inferior_status (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\
|
|
When the function (%s) is done executing, GDB will silently\n\
|
|
stop (instead of continuing to evaluate the expression containing\n\
|
|
the function call).", name);
|
|
}
|
|
|
|
/* The above code errors out, so ... */
|
|
internal_error (__FILE__, __LINE__, "... should not be here");
|
|
}
|
|
|
|
/* If we get here the called FUNCTION run to completion. */
|
|
|
|
/* On normal return, the stack dummy has been popped already. */
|
|
regcache_cpy_no_passthrough (retbuf, stop_registers);
|
|
|
|
/* Restore the inferior status, via its cleanup. At this stage,
|
|
leave the RETBUF alone. */
|
|
do_cleanups (inf_status_cleanup);
|
|
|
|
/* Figure out the value returned by the function. */
|
|
if (struct_return)
|
|
{
|
|
/* NOTE: cagney/2003-09-27: This assumes that PUSH_DUMMY_CALL
|
|
has correctly stored STRUCT_ADDR in the target. In the past
|
|
that hasn't been the case, the old MIPS PUSH_ARGUMENTS
|
|
(PUSH_DUMMY_CALL precursor) would silently move the location
|
|
of the struct return value making STRUCT_ADDR bogus. If
|
|
you're seeing problems with values being returned using the
|
|
"struct return convention", check that PUSH_DUMMY_CALL isn't
|
|
playing tricks. */
|
|
struct value *retval = value_at (value_type, struct_addr, NULL);
|
|
do_cleanups (retbuf_cleanup);
|
|
return retval;
|
|
}
|
|
else
|
|
{
|
|
/* The non-register case was handled above. */
|
|
struct value *retval = register_value_being_returned (value_type,
|
|
retbuf);
|
|
do_cleanups (retbuf_cleanup);
|
|
return retval;
|
|
}
|
|
}
|
|
|
|
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\n\
|
|
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", "\
|
|
Show coercion of floats to doubles when calling functions\n\
|
|
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, NULL, &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.\n\
|
|
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.", "\
|
|
Set unwinding of stack if a signal is received while in a call dummy.\n\
|
|
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, NULL, &setlist, &showlist);
|
|
}
|