diff options
Diffstat (limited to 'gdb/infcall.c')
| -rw-r--r-- | gdb/infcall.c | 247 |
1 files changed, 126 insertions, 121 deletions
diff --git a/gdb/infcall.c b/gdb/infcall.c index fba70b9..a77f54d 100644 --- a/gdb/infcall.c +++ b/gdb/infcall.c @@ -237,7 +237,6 @@ struct value * call_function_by_hand (struct value *function, int nargs, struct value **args) { register CORE_ADDR sp; - register int i; int rc; CORE_ADDR start_sp; /* CALL_DUMMY is an array of words (REGISTER_SIZE), but each word @@ -258,7 +257,6 @@ call_function_by_hand (struct value *function, int nargs, struct value **args) int sizeof_dummy1; char *dummy1; CORE_ADDR dummy_addr; - CORE_ADDR old_sp; struct type *value_type; unsigned char struct_return; CORE_ADDR struct_addr = 0; @@ -322,55 +320,56 @@ call_function_by_hand (struct value *function, int nargs, struct value **args) generic_push_dummy_frame (); } - old_sp = read_sp (); - /* Ensure that the initial SP is correctly aligned. */ - if (gdbarch_frame_align_p (current_gdbarch)) - { - /* 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 framelss (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 - :-). */ - sp = gdbarch_frame_align (current_gdbarch, old_sp); - 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! Further, per comment above, 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 its architecture vector. After that, try - adding SAVE_DUMMY_FRAME_TOS() and modifying - DEPRECATED_FRAME_CHAIN so that when the next outer frame is a - generic dummy, it returns the current frame's base. */ - sp = old_sp; + { + CORE_ADDR old_sp = read_sp (); + if (gdbarch_frame_align_p (current_gdbarch)) + { + /* 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 framelss (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 :-). */ + sp = gdbarch_frame_align (current_gdbarch, old_sp); + 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! Further, per comment above, 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 its architecture vector. After that, + try adding SAVE_DUMMY_FRAME_TOS() and modifying + DEPRECATED_FRAME_CHAIN so that when the next outer frame is a + generic dummy, it returns the current frame's base. */ + sp = old_sp; + } if (INNER_THAN (1, 2)) { @@ -407,10 +406,13 @@ call_function_by_hand (struct value *function, int nargs, struct value **args) /* Create a call sequence customized for this function and the number of arguments for it. */ - for (i = 0; i < (int) (SIZEOF_CALL_DUMMY_WORDS / sizeof (dummy[0])); i++) - store_unsigned_integer (&dummy1[i * REGISTER_SIZE], - REGISTER_SIZE, - (ULONGEST) dummy[i]); + { + int i; + for (i = 0; i < (int) (SIZEOF_CALL_DUMMY_WORDS / sizeof (dummy[0])); i++) + store_unsigned_integer (&dummy1[i * REGISTER_SIZE], + REGISTER_SIZE, + (ULONGEST) dummy[i]); + } switch (CALL_DUMMY_LOCATION) { @@ -459,72 +461,74 @@ call_function_by_hand (struct value *function, int nargs, struct value **args) internal_error (__FILE__, __LINE__, "bad switch"); } -#ifdef lint - sp = old_sp; /* It really is used, for some ifdef's... */ -#endif - if (nargs < TYPE_NFIELDS (ftype)) error ("too few arguments in function call"); - 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 $$dyncall_external - which requires some registers setting, this is taken care of - if we call via a function pointer variable, but not via a - function address. In cc this is not a problem. */ + { + int i; + for (i = nargs - 1; i >= 0; i--) + { + int prototyped; + struct type *param_type; + + /* FIXME drow/2002-05-31: Should just always mark methods as + prototyped. Can we respect TYPE_VARARGS? Probably not. */ + if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) + prototyped = 1; + else if (i < TYPE_NFIELDS (ftype)) + prototyped = TYPE_PROTOTYPED (ftype); + else + prototyped = 0; - if (using_gcc == 0) - { - if (param_type != NULL && TYPE_CODE (ftype) != TYPE_CODE_METHOD) - { - /* if this parameter is a pointer to function. */ - if (TYPE_CODE (param_type) == TYPE_CODE_PTR) - if (TYPE_CODE (TYPE_TARGET_TYPE (param_type)) == TYPE_CODE_FUNC) - /* elz: FIXME here should go the test about the - compiler used to compile the target. We want to - issue the error message only if the compiler used - was HP's aCC. If we used HP's cc, then there is - no problem and no need to return at this point. */ - /* Go see if the actual parameter is a variable of - type pointer to function or just a function. */ - if (args[i]->lval == not_lval) - { - char *arg_name; - if (find_pc_partial_function ((CORE_ADDR) args[i]->aligner.contents[0], &arg_name, NULL, NULL)) - error ("\ + if (i < TYPE_NFIELDS (ftype)) + param_type = TYPE_FIELD_TYPE (ftype, i); + else + param_type = NULL; + + args[i] = value_arg_coerce (args[i], param_type, prototyped); + + /* elz: this code is to handle the case in which the function + to be called has a pointer to function as parameter and the + corresponding actual argument is the address of a function + and not a pointer to function variable. In aCC compiled + code, the calls through pointers to functions (in the body + of the function called by hand) are made via + $$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 (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--) @@ -632,7 +636,7 @@ You must use a pointer to function type variable. Command ignored.", arg_name); { /* 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 ()) @@ -774,24 +778,25 @@ You must use a pointer to function type variable. Command ignored.", arg_name); struct regcache *buffer = retbuf; struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0); int saved_async = 0; - struct breakpoint *bpt; - struct symtab_and_line sal; /* Now proceed, having reached the desired place. */ clear_proceed_status (); - init_sal (&sal); /* initialize to zeroes */ - sal.pc = bp_addr; - sal.section = find_pc_overlay (sal.pc); - + /* 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. */ - struct frame_id frame = frame_id_build (read_fp (), sal.pc); - /* Create a momentary breakpoint at the return address of the - inferior. That way it breaks when it returns. */ + frame = frame_id_build (read_fp (), sal.pc); bpt = set_momentary_breakpoint (sal, frame, bp_call_dummy); bpt->disposition = disp_del; } |