1 /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
3 Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
29 #include "gdb_string.h"
33 #include "arch-utils.h"
45 #define MDRQ_REGNUM 14
47 #define MCRH_REGNUM 26
48 #define MCRL_REGNUM 27
49 #define MCVF_REGNUM 28
51 enum movm_register_bits
{
52 movm_exother_bit
= 0x01,
53 movm_exreg1_bit
= 0x02,
54 movm_exreg0_bit
= 0x04,
55 movm_other_bit
= 0x08,
62 extern void _initialize_mn10300_tdep (void);
63 static CORE_ADDR
mn10300_analyze_prologue (struct frame_info
*fi
,
66 /* mn10300 private data */
70 #define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode)
73 /* Additional info used by the frame */
75 struct frame_extra_info
83 register_name (int reg
, char **regs
, long sizeof_regs
)
85 if (reg
< 0 || reg
>= sizeof_regs
/ sizeof (regs
[0]))
92 mn10300_generic_register_name (int reg
)
95 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
96 "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
97 "", "", "", "", "", "", "", "",
98 "", "", "", "", "", "", "", "fp"
100 return register_name (reg
, regs
, sizeof regs
);
105 am33_register_name (int reg
)
107 static char *regs
[] =
108 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
109 "sp", "pc", "mdr", "psw", "lir", "lar", "",
110 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
111 "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""
113 return register_name (reg
, regs
, sizeof regs
);
117 mn10300_saved_pc_after_call (struct frame_info
*fi
)
119 return read_memory_integer (read_register (SP_REGNUM
), 4);
123 mn10300_extract_return_value (struct type
*type
, char *regbuf
, char *valbuf
)
125 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
126 memcpy (valbuf
, regbuf
+ REGISTER_BYTE (4), TYPE_LENGTH (type
));
128 memcpy (valbuf
, regbuf
+ REGISTER_BYTE (0), TYPE_LENGTH (type
));
132 mn10300_extract_struct_value_address (char *regbuf
)
134 return extract_address (regbuf
+ REGISTER_BYTE (4),
135 REGISTER_RAW_SIZE (4));
139 mn10300_store_return_value (struct type
*type
, char *valbuf
)
141 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
142 deprecated_write_register_bytes (REGISTER_BYTE (4), valbuf
,
145 deprecated_write_register_bytes (REGISTER_BYTE (0), valbuf
,
149 static struct frame_info
*analyze_dummy_frame (CORE_ADDR
, CORE_ADDR
);
150 static struct frame_info
*
151 analyze_dummy_frame (CORE_ADDR pc
, CORE_ADDR frame
)
153 static struct frame_info
*dummy
= NULL
;
156 struct frame_extra_info
*extra_info
;
157 CORE_ADDR
*saved_regs
;
158 dummy
= deprecated_frame_xmalloc ();
159 saved_regs
= xmalloc (SIZEOF_FRAME_SAVED_REGS
);
160 deprecated_set_frame_saved_regs_hack (dummy
, saved_regs
);
161 extra_info
= XMALLOC (struct frame_extra_info
);
162 deprecated_set_frame_extra_info_hack (dummy
, extra_info
);
164 deprecated_set_frame_next_hack (dummy
, NULL
);
165 deprecated_set_frame_prev_hack (dummy
, NULL
);
166 deprecated_update_frame_pc_hack (dummy
, pc
);
167 deprecated_update_frame_base_hack (dummy
, frame
);
168 get_frame_extra_info (dummy
)->status
= 0;
169 get_frame_extra_info (dummy
)->stack_size
= 0;
170 memset (get_frame_saved_regs (dummy
), '\000', SIZEOF_FRAME_SAVED_REGS
);
171 mn10300_analyze_prologue (dummy
, 0);
175 /* Values for frame_info.status */
177 #define MY_FRAME_IN_SP 0x1
178 #define MY_FRAME_IN_FP 0x2
179 #define NO_MORE_FRAMES 0x4
182 /* Should call_function allocate stack space for a struct return? */
184 mn10300_use_struct_convention (int gcc_p
, struct type
*type
)
186 return (TYPE_NFIELDS (type
) > 1 || TYPE_LENGTH (type
) > 8);
189 /* The breakpoint instruction must be the same size as the smallest
190 instruction in the instruction set.
192 The Matsushita mn10x00 processors have single byte instructions
193 so we need a single byte breakpoint. Matsushita hasn't defined
194 one, so we defined it ourselves. */
196 const static unsigned char *
197 mn10300_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
199 static char breakpoint
[] =
206 /* Fix fi->frame if it's bogus at this point. This is a helper
207 function for mn10300_analyze_prologue. */
210 fix_frame_pointer (struct frame_info
*fi
, int stack_size
)
212 if (fi
&& get_next_frame (fi
) == NULL
)
214 if (get_frame_extra_info (fi
)->status
& MY_FRAME_IN_SP
)
215 deprecated_update_frame_base_hack (fi
, read_sp () - stack_size
);
216 else if (get_frame_extra_info (fi
)->status
& MY_FRAME_IN_FP
)
217 deprecated_update_frame_base_hack (fi
, read_register (A3_REGNUM
));
222 /* Set offsets of registers saved by movm instruction.
223 This is a helper function for mn10300_analyze_prologue. */
226 set_movm_offsets (struct frame_info
*fi
, int movm_args
)
230 if (fi
== NULL
|| movm_args
== 0)
233 if (movm_args
& movm_other_bit
)
235 /* The `other' bit leaves a blank area of four bytes at the
236 beginning of its block of saved registers, making it 32 bytes
238 get_frame_saved_regs (fi
)[LAR_REGNUM
] = get_frame_base (fi
) + offset
+ 4;
239 get_frame_saved_regs (fi
)[LIR_REGNUM
] = get_frame_base (fi
) + offset
+ 8;
240 get_frame_saved_regs (fi
)[MDR_REGNUM
] = get_frame_base (fi
) + offset
+ 12;
241 get_frame_saved_regs (fi
)[A0_REGNUM
+ 1] = get_frame_base (fi
) + offset
+ 16;
242 get_frame_saved_regs (fi
)[A0_REGNUM
] = get_frame_base (fi
) + offset
+ 20;
243 get_frame_saved_regs (fi
)[D0_REGNUM
+ 1] = get_frame_base (fi
) + offset
+ 24;
244 get_frame_saved_regs (fi
)[D0_REGNUM
] = get_frame_base (fi
) + offset
+ 28;
247 if (movm_args
& movm_a3_bit
)
249 get_frame_saved_regs (fi
)[A3_REGNUM
] = get_frame_base (fi
) + offset
;
252 if (movm_args
& movm_a2_bit
)
254 get_frame_saved_regs (fi
)[A2_REGNUM
] = get_frame_base (fi
) + offset
;
257 if (movm_args
& movm_d3_bit
)
259 get_frame_saved_regs (fi
)[D3_REGNUM
] = get_frame_base (fi
) + offset
;
262 if (movm_args
& movm_d2_bit
)
264 get_frame_saved_regs (fi
)[D2_REGNUM
] = get_frame_base (fi
) + offset
;
269 if (movm_args
& movm_exother_bit
)
271 get_frame_saved_regs (fi
)[MCVF_REGNUM
] = get_frame_base (fi
) + offset
;
272 get_frame_saved_regs (fi
)[MCRL_REGNUM
] = get_frame_base (fi
) + offset
+ 4;
273 get_frame_saved_regs (fi
)[MCRH_REGNUM
] = get_frame_base (fi
) + offset
+ 8;
274 get_frame_saved_regs (fi
)[MDRQ_REGNUM
] = get_frame_base (fi
) + offset
+ 12;
275 get_frame_saved_regs (fi
)[E0_REGNUM
+ 1] = get_frame_base (fi
) + offset
+ 16;
276 get_frame_saved_regs (fi
)[E0_REGNUM
+ 0] = get_frame_base (fi
) + offset
+ 20;
279 if (movm_args
& movm_exreg1_bit
)
281 get_frame_saved_regs (fi
)[E0_REGNUM
+ 7] = get_frame_base (fi
) + offset
;
282 get_frame_saved_regs (fi
)[E0_REGNUM
+ 6] = get_frame_base (fi
) + offset
+ 4;
283 get_frame_saved_regs (fi
)[E0_REGNUM
+ 5] = get_frame_base (fi
) + offset
+ 8;
284 get_frame_saved_regs (fi
)[E0_REGNUM
+ 4] = get_frame_base (fi
) + offset
+ 12;
287 if (movm_args
& movm_exreg0_bit
)
289 get_frame_saved_regs (fi
)[E0_REGNUM
+ 3] = get_frame_base (fi
) + offset
;
290 get_frame_saved_regs (fi
)[E0_REGNUM
+ 2] = get_frame_base (fi
) + offset
+ 4;
297 /* The main purpose of this file is dealing with prologues to extract
298 information about stack frames and saved registers.
300 In gcc/config/mn13000/mn10300.c, the expand_prologue prologue
301 function is pretty readable, and has a nice explanation of how the
302 prologue is generated. The prologues generated by that code will
303 have the following form (NOTE: the current code doesn't handle all
306 + If this is an old-style varargs function, then its arguments
307 need to be flushed back to the stack:
312 + If we use any of the callee-saved registers, save them now.
314 movm [some callee-saved registers],(sp)
316 + If we have any floating-point registers to save:
318 - Decrement the stack pointer to reserve space for the registers.
319 If the function doesn't need a frame pointer, we may combine
320 this with the adjustment that reserves space for the frame.
324 - Save the floating-point registers. We have two possible
327 . Save them at fixed offset from the SP:
329 fmov fsN,(OFFSETN,sp)
330 fmov fsM,(OFFSETM,sp)
333 Note that, if OFFSETN happens to be zero, you'll get the
334 different opcode: fmov fsN,(sp)
336 . Or, set a0 to the start of the save area, and then use
337 post-increment addressing to save the FP registers.
345 + If the function needs a frame pointer, we set it here.
349 + Now we reserve space for the stack frame proper. This could be
350 merged into the `add -SIZE, sp' instruction for FP saves up
351 above, unless we needed to set the frame pointer in the previous
352 step, or the frame is so large that allocating the whole thing at
353 once would put the FP register save slots out of reach of the
354 addressing mode (128 bytes).
358 One day we might keep the stack pointer constant, that won't
359 change the code for prologues, but it will make the frame
360 pointerless case much more common. */
362 /* Analyze the prologue to determine where registers are saved,
363 the end of the prologue, etc etc. Return the end of the prologue
366 We store into FI (if non-null) several tidbits of information:
368 * stack_size -- size of this stack frame. Note that if we stop in
369 certain parts of the prologue/epilogue we may claim the size of the
370 current frame is zero. This happens when the current frame has
371 not been allocated yet or has already been deallocated.
373 * fsr -- Addresses of registers saved in the stack by this frame.
375 * status -- A (relatively) generic status indicator. It's a bitmask
376 with the following bits:
378 MY_FRAME_IN_SP: The base of the current frame is actually in
379 the stack pointer. This can happen for frame pointerless
380 functions, or cases where we're stopped in the prologue/epilogue
381 itself. For these cases mn10300_analyze_prologue will need up
382 update fi->frame before returning or analyzing the register
385 MY_FRAME_IN_FP: The base of the current frame is in the
386 frame pointer register ($a3).
388 NO_MORE_FRAMES: Set this if the current frame is "start" or
389 if the first instruction looks like mov <imm>,sp. This tells
390 frame chain to not bother trying to unwind past this frame. */
393 mn10300_analyze_prologue (struct frame_info
*fi
, CORE_ADDR pc
)
395 CORE_ADDR func_addr
, func_end
, addr
, stop
;
396 CORE_ADDR stack_size
;
398 unsigned char buf
[4];
399 int status
, movm_args
= 0;
402 /* Use the PC in the frame if it's provided to look up the
403 start of this function. */
404 pc
= (fi
? get_frame_pc (fi
) : pc
);
406 /* Find the start of this function. */
407 status
= find_pc_partial_function (pc
, &name
, &func_addr
, &func_end
);
409 /* Do nothing if we couldn't find the start of this function or if we're
410 stopped at the first instruction in the prologue. */
416 /* If we're in start, then give up. */
417 if (strcmp (name
, "start") == 0)
420 get_frame_extra_info (fi
)->status
= NO_MORE_FRAMES
;
424 /* At the start of a function our frame is in the stack pointer. */
426 get_frame_extra_info (fi
)->status
= MY_FRAME_IN_SP
;
428 /* Get the next two bytes into buf, we need two because rets is a two
429 byte insn and the first isn't enough to uniquely identify it. */
430 status
= read_memory_nobpt (pc
, buf
, 2);
434 /* If we're physically on an "rets" instruction, then our frame has
435 already been deallocated. Note this can also be true for retf
436 and ret if they specify a size of zero.
438 In this case fi->frame is bogus, we need to fix it. */
439 if (fi
&& buf
[0] == 0xf0 && buf
[1] == 0xfc)
441 if (get_next_frame (fi
) == NULL
)
442 deprecated_update_frame_base_hack (fi
, read_sp ());
443 return get_frame_pc (fi
);
446 /* Similarly if we're stopped on the first insn of a prologue as our
447 frame hasn't been allocated yet. */
448 if (fi
&& get_frame_pc (fi
) == func_addr
)
450 if (get_next_frame (fi
) == NULL
)
451 deprecated_update_frame_base_hack (fi
, read_sp ());
452 return get_frame_pc (fi
);
455 /* Figure out where to stop scanning. */
456 stop
= fi
? get_frame_pc (fi
) : func_end
;
458 /* Don't walk off the end of the function. */
459 stop
= stop
> func_end
? func_end
: stop
;
461 /* Start scanning on the first instruction of this function. */
464 /* Suck in two bytes. */
465 status
= read_memory_nobpt (addr
, buf
, 2);
468 fix_frame_pointer (fi
, 0);
472 /* First see if this insn sets the stack pointer from a register; if
473 so, it's probably the initialization of the stack pointer in _start,
474 so mark this as the bottom-most frame. */
475 if (buf
[0] == 0xf2 && (buf
[1] & 0xf3) == 0xf0)
478 get_frame_extra_info (fi
)->status
= NO_MORE_FRAMES
;
482 /* Now look for movm [regs],sp, which saves the callee saved registers.
484 At this time we don't know if fi->frame is valid, so we only note
485 that we encountered a movm instruction. Later, we'll set the entries
486 in fsr.regs as needed. */
489 /* Extract the register list for the movm instruction. */
490 status
= read_memory_nobpt (addr
+ 1, buf
, 1);
495 /* Quit now if we're beyond the stop point. */
498 /* Fix fi->frame since it's bogus at this point. */
499 if (fi
&& get_next_frame (fi
) == NULL
)
500 deprecated_update_frame_base_hack (fi
, read_sp ());
502 /* Note if/where callee saved registers were saved. */
503 set_movm_offsets (fi
, movm_args
);
507 /* Get the next two bytes so the prologue scan can continue. */
508 status
= read_memory_nobpt (addr
, buf
, 2);
511 /* Fix fi->frame since it's bogus at this point. */
512 if (fi
&& get_next_frame (fi
) == NULL
)
513 deprecated_update_frame_base_hack (fi
, read_sp ());
515 /* Note if/where callee saved registers were saved. */
516 set_movm_offsets (fi
, movm_args
);
521 /* Now see if we set up a frame pointer via "mov sp,a3" */
526 /* The frame pointer is now valid. */
529 get_frame_extra_info (fi
)->status
|= MY_FRAME_IN_FP
;
530 get_frame_extra_info (fi
)->status
&= ~MY_FRAME_IN_SP
;
533 /* Quit now if we're beyond the stop point. */
536 /* Fix fi->frame if it's bogus at this point. */
537 fix_frame_pointer (fi
, 0);
539 /* Note if/where callee saved registers were saved. */
540 set_movm_offsets (fi
, movm_args
);
544 /* Get two more bytes so scanning can continue. */
545 status
= read_memory_nobpt (addr
, buf
, 2);
548 /* Fix fi->frame if it's bogus at this point. */
549 fix_frame_pointer (fi
, 0);
551 /* Note if/where callee saved registers were saved. */
552 set_movm_offsets (fi
, movm_args
);
557 /* Next we should allocate the local frame. No more prologue insns
558 are found after allocating the local frame.
560 Search for add imm8,sp (0xf8feXX)
561 or add imm16,sp (0xfafeXXXX)
562 or add imm32,sp (0xfcfeXXXXXXXX).
564 If none of the above was found, then this prologue has no
567 status
= read_memory_nobpt (addr
, buf
, 2);
570 /* Fix fi->frame if it's bogus at this point. */
571 fix_frame_pointer (fi
, 0);
573 /* Note if/where callee saved registers were saved. */
574 set_movm_offsets (fi
, movm_args
);
579 if (buf
[0] == 0xf8 && buf
[1] == 0xfe)
581 else if (buf
[0] == 0xfa && buf
[1] == 0xfe)
583 else if (buf
[0] == 0xfc && buf
[1] == 0xfe)
588 /* Suck in imm_size more bytes, they'll hold the size of the
590 status
= read_memory_nobpt (addr
+ 2, buf
, imm_size
);
593 /* Fix fi->frame if it's bogus at this point. */
594 fix_frame_pointer (fi
, 0);
596 /* Note if/where callee saved registers were saved. */
597 set_movm_offsets (fi
, movm_args
);
601 /* Note the size of the stack in the frame info structure. */
602 stack_size
= extract_signed_integer (buf
, imm_size
);
604 get_frame_extra_info (fi
)->stack_size
= stack_size
;
606 /* We just consumed 2 + imm_size bytes. */
607 addr
+= 2 + imm_size
;
609 /* No more prologue insns follow, so begin preparation to return. */
610 /* Fix fi->frame if it's bogus at this point. */
611 fix_frame_pointer (fi
, stack_size
);
613 /* Note if/where callee saved registers were saved. */
614 set_movm_offsets (fi
, movm_args
);
618 /* We never found an insn which allocates local stack space, regardless
619 this is the end of the prologue. */
620 /* Fix fi->frame if it's bogus at this point. */
621 fix_frame_pointer (fi
, 0);
623 /* Note if/where callee saved registers were saved. */
624 set_movm_offsets (fi
, movm_args
);
629 /* Function: saved_regs_size
630 Return the size in bytes of the register save area, based on the
631 saved_regs array in FI. */
633 saved_regs_size (struct frame_info
*fi
)
638 /* Reserve four bytes for every register saved. */
639 for (i
= 0; i
< NUM_REGS
; i
++)
640 if (get_frame_saved_regs (fi
)[i
])
643 /* If we saved LIR, then it's most likely we used a `movm'
644 instruction with the `other' bit set, in which case the SP is
645 decremented by an extra four bytes, "to simplify calculation
646 of the transfer area", according to the processor manual. */
647 if (get_frame_saved_regs (fi
)[LIR_REGNUM
])
654 /* Function: frame_chain
655 Figure out and return the caller's frame pointer given current
658 We don't handle dummy frames yet but we would probably just return the
659 stack pointer that was in use at the time the function call was made? */
662 mn10300_frame_chain (struct frame_info
*fi
)
664 struct frame_info
*dummy
;
665 /* Walk through the prologue to determine the stack size,
666 location of saved registers, end of the prologue, etc. */
667 if (get_frame_extra_info (fi
)->status
== 0)
668 mn10300_analyze_prologue (fi
, (CORE_ADDR
) 0);
670 /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */
671 if (get_frame_extra_info (fi
)->status
& NO_MORE_FRAMES
)
674 /* Now that we've analyzed our prologue, determine the frame
675 pointer for our caller.
677 If our caller has a frame pointer, then we need to
678 find the entry value of $a3 to our function.
680 If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory
681 location pointed to by fsr.regs[A3_REGNUM].
683 Else it's still in $a3.
685 If our caller does not have a frame pointer, then his
686 frame base is fi->frame + -caller's stack size. */
688 /* The easiest way to get that info is to analyze our caller's frame.
689 So we set up a dummy frame and call mn10300_analyze_prologue to
690 find stuff for us. */
691 dummy
= analyze_dummy_frame (DEPRECATED_FRAME_SAVED_PC (fi
), get_frame_base (fi
));
693 if (get_frame_extra_info (dummy
)->status
& MY_FRAME_IN_FP
)
695 /* Our caller has a frame pointer. So find the frame in $a3 or
697 if (get_frame_saved_regs (fi
)[A3_REGNUM
])
698 return (read_memory_integer (get_frame_saved_regs (fi
)[A3_REGNUM
],
699 DEPRECATED_REGISTER_SIZE
));
701 return read_register (A3_REGNUM
);
705 int adjust
= saved_regs_size (fi
);
707 /* Our caller does not have a frame pointer. So his frame starts
708 at the base of our frame (fi->frame) + register save space
710 return get_frame_base (fi
) + adjust
+ -get_frame_extra_info (dummy
)->stack_size
;
714 /* Function: skip_prologue
715 Return the address of the first inst past the prologue of the function. */
718 mn10300_skip_prologue (CORE_ADDR pc
)
720 /* We used to check the debug symbols, but that can lose if
721 we have a null prologue. */
722 return mn10300_analyze_prologue (NULL
, pc
);
725 /* generic_pop_current_frame calls this function if the current
726 frame isn't a dummy frame. */
728 mn10300_pop_frame_regular (struct frame_info
*frame
)
732 write_register (PC_REGNUM
, DEPRECATED_FRAME_SAVED_PC (frame
));
734 /* Restore any saved registers. */
735 for (regnum
= 0; regnum
< NUM_REGS
; regnum
++)
736 if (get_frame_saved_regs (frame
)[regnum
] != 0)
740 value
= read_memory_unsigned_integer (get_frame_saved_regs (frame
)[regnum
],
741 REGISTER_RAW_SIZE (regnum
));
742 write_register (regnum
, value
);
745 /* Actually cut back the stack. */
746 write_register (SP_REGNUM
, get_frame_base (frame
));
748 /* Don't we need to set the PC?!? XXX FIXME. */
751 /* Function: pop_frame
752 This routine gets called when either the user uses the `return'
753 command, or the call dummy breakpoint gets hit. */
755 mn10300_pop_frame (void)
757 /* This function checks for and handles generic dummy frames, and
758 calls back to our function for ordinary frames. */
759 generic_pop_current_frame (mn10300_pop_frame_regular
);
761 /* Throw away any cached frame information. */
762 flush_cached_frames ();
765 /* Function: push_arguments
766 Setup arguments for a call to the target. Arguments go in
767 order on the stack. */
770 mn10300_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
771 int struct_return
, CORE_ADDR struct_addr
)
775 int stack_offset
= 0;
776 int regsused
= struct_return
? 1 : 0;
778 /* This should be a nop, but align the stack just in case something
779 went wrong. Stacks are four byte aligned on the mn10300. */
782 /* Now make space on the stack for the args.
784 XXX This doesn't appear to handle pass-by-invisible reference
786 for (argnum
= 0; argnum
< nargs
; argnum
++)
788 int arg_length
= (TYPE_LENGTH (VALUE_TYPE (args
[argnum
])) + 3) & ~3;
790 while (regsused
< 2 && arg_length
> 0)
798 /* Allocate stack space. */
801 regsused
= struct_return
? 1 : 0;
802 /* Push all arguments onto the stack. */
803 for (argnum
= 0; argnum
< nargs
; argnum
++)
808 /* XXX Check this. What about UNIONS? */
809 if (TYPE_CODE (VALUE_TYPE (*args
)) == TYPE_CODE_STRUCT
810 && TYPE_LENGTH (VALUE_TYPE (*args
)) > 8)
812 /* XXX Wrong, we want a pointer to this argument. */
813 len
= TYPE_LENGTH (VALUE_TYPE (*args
));
814 val
= (char *) VALUE_CONTENTS (*args
);
818 len
= TYPE_LENGTH (VALUE_TYPE (*args
));
819 val
= (char *) VALUE_CONTENTS (*args
);
822 while (regsused
< 2 && len
> 0)
824 write_register (regsused
, extract_unsigned_integer (val
, 4));
832 write_memory (sp
+ stack_offset
, val
, 4);
841 /* Make space for the flushback area. */
846 /* Function: push_return_address (pc)
847 Set up the return address for the inferior function call.
848 Needed for targets where we don't actually execute a JSR/BSR instruction */
851 mn10300_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
853 unsigned char buf
[4];
855 store_unsigned_integer (buf
, 4, CALL_DUMMY_ADDRESS ());
856 write_memory (sp
- 4, buf
, 4);
860 /* Function: store_struct_return (addr,sp)
861 Store the structure value return address for an inferior function
865 mn10300_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
867 /* The structure return address is passed as the first argument. */
868 write_register (0, addr
);
871 /* Function: frame_saved_pc
872 Find the caller of this frame. We do this by seeing if RP_REGNUM
873 is saved in the stack anywhere, otherwise we get it from the
874 registers. If the inner frame is a dummy frame, return its PC
875 instead of RP, because that's where "caller" of the dummy-frame
879 mn10300_frame_saved_pc (struct frame_info
*fi
)
881 int adjust
= saved_regs_size (fi
);
883 return (read_memory_integer (get_frame_base (fi
) + adjust
,
884 DEPRECATED_REGISTER_SIZE
));
887 /* Function: mn10300_init_extra_frame_info
888 Setup the frame's frame pointer, pc, and frame addresses for saved
889 registers. Most of the work is done in mn10300_analyze_prologue().
891 Note that when we are called for the last frame (currently active frame),
892 that get_frame_pc (fi) and fi->frame will already be setup. However, fi->frame will
893 be valid only if this routine uses FP. For previous frames, fi-frame will
894 always be correct. mn10300_analyze_prologue will fix fi->frame if
897 We can be called with the PC in the call dummy under two
898 circumstances. First, during normal backtracing, second, while
899 figuring out the frame pointer just prior to calling the target
900 function (see call_function_by_hand). */
903 mn10300_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
905 if (get_next_frame (fi
))
906 deprecated_update_frame_pc_hack (fi
, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi
)));
908 frame_saved_regs_zalloc (fi
);
909 frame_extra_info_zalloc (fi
, sizeof (struct frame_extra_info
));
911 get_frame_extra_info (fi
)->status
= 0;
912 get_frame_extra_info (fi
)->stack_size
= 0;
914 mn10300_analyze_prologue (fi
, 0);
918 /* This function's job is handled by init_extra_frame_info. */
920 mn10300_frame_init_saved_regs (struct frame_info
*frame
)
925 /* Function: mn10300_virtual_frame_pointer
926 Return the register that the function uses for a frame pointer,
927 plus any necessary offset to be applied to the register before
928 any frame pointer offsets. */
931 mn10300_virtual_frame_pointer (CORE_ADDR pc
,
935 struct frame_info
*dummy
= analyze_dummy_frame (pc
, 0);
936 /* Set up a dummy frame_info, Analyze the prolog and fill in the
938 /* Results will tell us which type of frame it uses. */
939 if (get_frame_extra_info (dummy
)->status
& MY_FRAME_IN_SP
)
942 *offset
= -(get_frame_extra_info (dummy
)->stack_size
);
952 mn10300_reg_struct_has_addr (int gcc_p
, struct type
*type
)
954 return (TYPE_LENGTH (type
) > 8);
958 mn10300_register_virtual_type (int reg
)
960 return builtin_type_int
;
964 mn10300_register_byte (int reg
)
970 mn10300_register_virtual_size (int reg
)
976 mn10300_register_raw_size (int reg
)
981 /* If DWARF2 is a register number appearing in Dwarf2 debug info, then
982 mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
983 register number. Why don't Dwarf2 and GDB use the same numbering?
984 Who knows? But since people have object files lying around with
985 the existing Dwarf2 numbering, and other people have written stubs
986 to work with the existing GDB, neither of them can change. So we
987 just have to cope. */
989 mn10300_dwarf2_reg_to_regnum (int dwarf2
)
991 /* This table is supposed to be shaped like the REGISTER_NAMES
992 initializer in gcc/config/mn10300/mn10300.h. Registers which
993 appear in GCC's numbering, but have no counterpart in GDB's
994 world, are marked with a -1. */
995 static int dwarf2_to_gdb
[] = {
996 0, 1, 2, 3, 4, 5, 6, 7, -1, 8,
997 15, 16, 17, 18, 19, 20, 21, 22
1002 || dwarf2
>= (sizeof (dwarf2_to_gdb
) / sizeof (dwarf2_to_gdb
[0]))
1003 || dwarf2_to_gdb
[dwarf2
] == -1)
1004 internal_error (__FILE__
, __LINE__
,
1005 "bogus register number in debug info: %d", dwarf2
);
1007 return dwarf2_to_gdb
[dwarf2
];
1011 mn10300_print_register (const char *name
, int regnum
, int reg_width
)
1013 char raw_buffer
[MAX_REGISTER_SIZE
];
1016 printf_filtered ("%*s: ", reg_width
, name
);
1018 printf_filtered ("%s: ", name
);
1021 if (!frame_register_read (deprecated_selected_frame
, regnum
, raw_buffer
))
1023 printf_filtered ("[invalid]");
1029 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
1031 for (byte
= REGISTER_RAW_SIZE (regnum
) - REGISTER_VIRTUAL_SIZE (regnum
);
1032 byte
< REGISTER_RAW_SIZE (regnum
);
1034 printf_filtered ("%02x", (unsigned char) raw_buffer
[byte
]);
1038 for (byte
= REGISTER_VIRTUAL_SIZE (regnum
) - 1;
1041 printf_filtered ("%02x", (unsigned char) raw_buffer
[byte
]);
1047 mn10300_do_registers_info (int regnum
, int fpregs
)
1051 const char *name
= REGISTER_NAME (regnum
);
1052 if (name
== NULL
|| name
[0] == '\0')
1053 error ("Not a valid register for the current processor type");
1054 mn10300_print_register (name
, regnum
, 0);
1055 printf_filtered ("\n");
1059 /* print registers in an array 4x8 */
1062 const int nr_in_row
= 4;
1063 const int reg_width
= 4;
1064 for (r
= 0; r
< NUM_REGS
; r
+= nr_in_row
)
1069 for (c
= r
; c
< r
+ nr_in_row
; c
++)
1071 const char *name
= REGISTER_NAME (c
);
1072 if (name
!= NULL
&& *name
!= '\0')
1077 printf_filtered (" ");
1080 mn10300_print_register (name
, c
, reg_width
);
1081 printf_filtered (" ");
1085 padding
+= (reg_width
+ 2 + 8 + 1);
1089 printf_filtered ("\n");
1094 /* Dump out the mn10300 speciic architecture information. */
1097 mn10300_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
1099 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
1100 fprintf_unfiltered (file
, "mn10300_dump_tdep: am33_mode = %d\n",
1104 static struct gdbarch
*
1105 mn10300_gdbarch_init (struct gdbarch_info info
,
1106 struct gdbarch_list
*arches
)
1108 static LONGEST mn10300_call_dummy_words
[] = { 0 };
1109 struct gdbarch
*gdbarch
;
1110 struct gdbarch_tdep
*tdep
= NULL
;
1112 gdbarch_register_name_ftype
*register_name
;
1116 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
1118 return arches
->gdbarch
;
1119 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
1120 gdbarch
= gdbarch_alloc (&info
, tdep
);
1122 if (info
.bfd_arch_info
!= NULL
1123 && info
.bfd_arch_info
->arch
== bfd_arch_mn10300
)
1124 mach
= info
.bfd_arch_info
->mach
;
1130 case bfd_mach_mn10300
:
1132 register_name
= mn10300_generic_register_name
;
1137 register_name
= am33_register_name
;
1141 internal_error (__FILE__
, __LINE__
,
1142 "mn10300_gdbarch_init: Unknown mn10300 variant");
1143 return NULL
; /* keep GCC happy. */
1147 set_gdbarch_num_regs (gdbarch
, num_regs
);
1148 set_gdbarch_register_name (gdbarch
, register_name
);
1149 set_gdbarch_deprecated_register_size (gdbarch
, 4);
1150 set_gdbarch_register_bytes (gdbarch
, num_regs
* gdbarch_deprecated_register_size (gdbarch
));
1151 set_gdbarch_deprecated_max_register_raw_size (gdbarch
, 4);
1152 set_gdbarch_register_raw_size (gdbarch
, mn10300_register_raw_size
);
1153 set_gdbarch_register_byte (gdbarch
, mn10300_register_byte
);
1154 set_gdbarch_deprecated_max_register_virtual_size (gdbarch
, 4);
1155 set_gdbarch_register_virtual_size (gdbarch
, mn10300_register_virtual_size
);
1156 set_gdbarch_register_virtual_type (gdbarch
, mn10300_register_virtual_type
);
1157 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, mn10300_dwarf2_reg_to_regnum
);
1158 set_gdbarch_deprecated_do_registers_info (gdbarch
, mn10300_do_registers_info
);
1159 set_gdbarch_sp_regnum (gdbarch
, 8);
1160 set_gdbarch_pc_regnum (gdbarch
, 9);
1161 set_gdbarch_deprecated_fp_regnum (gdbarch
, 31);
1162 set_gdbarch_virtual_frame_pointer (gdbarch
, mn10300_virtual_frame_pointer
);
1165 set_gdbarch_breakpoint_from_pc (gdbarch
, mn10300_breakpoint_from_pc
);
1166 set_gdbarch_function_start_offset (gdbarch
, 0);
1167 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
1169 /* Stack unwinding. */
1170 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1171 set_gdbarch_deprecated_saved_pc_after_call (gdbarch
, mn10300_saved_pc_after_call
);
1172 set_gdbarch_deprecated_init_extra_frame_info (gdbarch
, mn10300_init_extra_frame_info
);
1173 set_gdbarch_deprecated_init_frame_pc (gdbarch
, init_frame_pc_noop
);
1174 set_gdbarch_deprecated_frame_init_saved_regs (gdbarch
, mn10300_frame_init_saved_regs
);
1175 set_gdbarch_deprecated_frame_chain (gdbarch
, mn10300_frame_chain
);
1176 set_gdbarch_deprecated_frame_saved_pc (gdbarch
, mn10300_frame_saved_pc
);
1177 set_gdbarch_deprecated_extract_return_value (gdbarch
, mn10300_extract_return_value
);
1178 set_gdbarch_deprecated_extract_struct_value_address
1179 (gdbarch
, mn10300_extract_struct_value_address
);
1180 set_gdbarch_deprecated_store_return_value (gdbarch
, mn10300_store_return_value
);
1181 set_gdbarch_deprecated_store_struct_return (gdbarch
, mn10300_store_struct_return
);
1182 set_gdbarch_deprecated_pop_frame (gdbarch
, mn10300_pop_frame
);
1183 set_gdbarch_skip_prologue (gdbarch
, mn10300_skip_prologue
);
1184 set_gdbarch_frame_args_skip (gdbarch
, 0);
1185 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
1186 /* That's right, we're using the stack pointer as our frame pointer. */
1187 set_gdbarch_deprecated_target_read_fp (gdbarch
, generic_target_read_sp
);
1189 /* Calling functions in the inferior from GDB. */
1190 set_gdbarch_deprecated_call_dummy_words (gdbarch
, mn10300_call_dummy_words
);
1191 set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch
, sizeof (mn10300_call_dummy_words
));
1192 set_gdbarch_deprecated_pc_in_call_dummy (gdbarch
, deprecated_pc_in_call_dummy_at_entry_point
);
1193 set_gdbarch_deprecated_push_arguments (gdbarch
, mn10300_push_arguments
);
1194 set_gdbarch_reg_struct_has_addr (gdbarch
, mn10300_reg_struct_has_addr
);
1195 set_gdbarch_deprecated_push_return_address (gdbarch
, mn10300_push_return_address
);
1196 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
1197 set_gdbarch_use_struct_convention (gdbarch
, mn10300_use_struct_convention
);
1199 tdep
->am33_mode
= am33_mode
;
1201 /* Should be using push_dummy_call. */
1202 set_gdbarch_deprecated_dummy_write_sp (gdbarch
, generic_target_write_sp
);
1208 _initialize_mn10300_tdep (void)
1210 /* printf("_initialize_mn10300_tdep\n"); */
1212 deprecated_tm_print_insn
= print_insn_mn10300
;
1214 register_gdbarch_init (bfd_arch_mn10300
, mn10300_gdbarch_init
);