1 /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
2 Copyright 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 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 write_register_bytes (REGISTER_BYTE (4), valbuf
, TYPE_LENGTH (type
));
144 write_register_bytes (REGISTER_BYTE (0), valbuf
, TYPE_LENGTH (type
));
147 static struct frame_info
*analyze_dummy_frame (CORE_ADDR
, CORE_ADDR
);
148 static struct frame_info
*
149 analyze_dummy_frame (CORE_ADDR pc
, CORE_ADDR frame
)
151 static struct frame_info
*dummy
= NULL
;
154 dummy
= xmalloc (sizeof (struct frame_info
));
155 dummy
->saved_regs
= xmalloc (SIZEOF_FRAME_SAVED_REGS
);
156 dummy
->extra_info
= xmalloc (sizeof (struct frame_extra_info
));
161 dummy
->frame
= frame
;
162 dummy
->extra_info
->status
= 0;
163 dummy
->extra_info
->stack_size
= 0;
164 memset (dummy
->saved_regs
, '\000', SIZEOF_FRAME_SAVED_REGS
);
165 mn10300_analyze_prologue (dummy
, 0);
169 /* Values for frame_info.status */
171 #define MY_FRAME_IN_SP 0x1
172 #define MY_FRAME_IN_FP 0x2
173 #define NO_MORE_FRAMES 0x4
176 /* Should call_function allocate stack space for a struct return? */
178 mn10300_use_struct_convention (int gcc_p
, struct type
*type
)
180 return (TYPE_NFIELDS (type
) > 1 || TYPE_LENGTH (type
) > 8);
183 /* The breakpoint instruction must be the same size as the smallest
184 instruction in the instruction set.
186 The Matsushita mn10x00 processors have single byte instructions
187 so we need a single byte breakpoint. Matsushita hasn't defined
188 one, so we defined it ourselves. */
190 static unsigned char *
191 mn10300_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
193 static char breakpoint
[] =
200 /* Fix fi->frame if it's bogus at this point. This is a helper
201 function for mn10300_analyze_prologue. */
204 fix_frame_pointer (struct frame_info
*fi
, int stack_size
)
206 if (fi
&& fi
->next
== NULL
)
208 if (fi
->extra_info
->status
& MY_FRAME_IN_SP
)
209 fi
->frame
= read_sp () - stack_size
;
210 else if (fi
->extra_info
->status
& MY_FRAME_IN_FP
)
211 fi
->frame
= read_register (A3_REGNUM
);
216 /* Set offsets of registers saved by movm instruction.
217 This is a helper function for mn10300_analyze_prologue. */
220 set_movm_offsets (struct frame_info
*fi
, int movm_args
)
224 if (fi
== NULL
|| movm_args
== 0)
227 if (movm_args
& movm_other_bit
)
229 /* The `other' bit leaves a blank area of four bytes at the
230 beginning of its block of saved registers, making it 32 bytes
232 fi
->saved_regs
[LAR_REGNUM
] = fi
->frame
+ offset
+ 4;
233 fi
->saved_regs
[LIR_REGNUM
] = fi
->frame
+ offset
+ 8;
234 fi
->saved_regs
[MDR_REGNUM
] = fi
->frame
+ offset
+ 12;
235 fi
->saved_regs
[A0_REGNUM
+ 1] = fi
->frame
+ offset
+ 16;
236 fi
->saved_regs
[A0_REGNUM
] = fi
->frame
+ offset
+ 20;
237 fi
->saved_regs
[D0_REGNUM
+ 1] = fi
->frame
+ offset
+ 24;
238 fi
->saved_regs
[D0_REGNUM
] = fi
->frame
+ offset
+ 28;
241 if (movm_args
& movm_a3_bit
)
243 fi
->saved_regs
[A3_REGNUM
] = fi
->frame
+ offset
;
246 if (movm_args
& movm_a2_bit
)
248 fi
->saved_regs
[A2_REGNUM
] = fi
->frame
+ offset
;
251 if (movm_args
& movm_d3_bit
)
253 fi
->saved_regs
[D3_REGNUM
] = fi
->frame
+ offset
;
256 if (movm_args
& movm_d2_bit
)
258 fi
->saved_regs
[D2_REGNUM
] = fi
->frame
+ offset
;
263 if (movm_args
& movm_exother_bit
)
265 fi
->saved_regs
[MCVF_REGNUM
] = fi
->frame
+ offset
;
266 fi
->saved_regs
[MCRL_REGNUM
] = fi
->frame
+ offset
+ 4;
267 fi
->saved_regs
[MCRH_REGNUM
] = fi
->frame
+ offset
+ 8;
268 fi
->saved_regs
[MDRQ_REGNUM
] = fi
->frame
+ offset
+ 12;
269 fi
->saved_regs
[E0_REGNUM
+ 1] = fi
->frame
+ offset
+ 16;
270 fi
->saved_regs
[E0_REGNUM
+ 0] = fi
->frame
+ offset
+ 20;
273 if (movm_args
& movm_exreg1_bit
)
275 fi
->saved_regs
[E0_REGNUM
+ 7] = fi
->frame
+ offset
;
276 fi
->saved_regs
[E0_REGNUM
+ 6] = fi
->frame
+ offset
+ 4;
277 fi
->saved_regs
[E0_REGNUM
+ 5] = fi
->frame
+ offset
+ 8;
278 fi
->saved_regs
[E0_REGNUM
+ 4] = fi
->frame
+ offset
+ 12;
281 if (movm_args
& movm_exreg0_bit
)
283 fi
->saved_regs
[E0_REGNUM
+ 3] = fi
->frame
+ offset
;
284 fi
->saved_regs
[E0_REGNUM
+ 2] = fi
->frame
+ offset
+ 4;
291 /* The main purpose of this file is dealing with prologues to extract
292 information about stack frames and saved registers.
294 In gcc/config/mn13000/mn10300.c, the expand_prologue prologue
295 function is pretty readable, and has a nice explanation of how the
296 prologue is generated. The prologues generated by that code will
297 have the following form (NOTE: the current code doesn't handle all
300 + If this is an old-style varargs function, then its arguments
301 need to be flushed back to the stack:
306 + If we use any of the callee-saved registers, save them now.
308 movm [some callee-saved registers],(sp)
310 + If we have any floating-point registers to save:
312 - Decrement the stack pointer to reserve space for the registers.
313 If the function doesn't need a frame pointer, we may combine
314 this with the adjustment that reserves space for the frame.
318 - Save the floating-point registers. We have two possible
321 . Save them at fixed offset from the SP:
323 fmov fsN,(OFFSETN,sp)
324 fmov fsM,(OFFSETM,sp)
327 Note that, if OFFSETN happens to be zero, you'll get the
328 different opcode: fmov fsN,(sp)
330 . Or, set a0 to the start of the save area, and then use
331 post-increment addressing to save the FP registers.
339 + If the function needs a frame pointer, we set it here.
343 + Now we reserve space for the stack frame proper. This could be
344 merged into the `add -SIZE, sp' instruction for FP saves up
345 above, unless we needed to set the frame pointer in the previous
346 step, or the frame is so large that allocating the whole thing at
347 once would put the FP register save slots out of reach of the
348 addressing mode (128 bytes).
352 One day we might keep the stack pointer constant, that won't
353 change the code for prologues, but it will make the frame
354 pointerless case much more common. */
356 /* Analyze the prologue to determine where registers are saved,
357 the end of the prologue, etc etc. Return the end of the prologue
360 We store into FI (if non-null) several tidbits of information:
362 * stack_size -- size of this stack frame. Note that if we stop in
363 certain parts of the prologue/epilogue we may claim the size of the
364 current frame is zero. This happens when the current frame has
365 not been allocated yet or has already been deallocated.
367 * fsr -- Addresses of registers saved in the stack by this frame.
369 * status -- A (relatively) generic status indicator. It's a bitmask
370 with the following bits:
372 MY_FRAME_IN_SP: The base of the current frame is actually in
373 the stack pointer. This can happen for frame pointerless
374 functions, or cases where we're stopped in the prologue/epilogue
375 itself. For these cases mn10300_analyze_prologue will need up
376 update fi->frame before returning or analyzing the register
379 MY_FRAME_IN_FP: The base of the current frame is in the
380 frame pointer register ($a3).
382 NO_MORE_FRAMES: Set this if the current frame is "start" or
383 if the first instruction looks like mov <imm>,sp. This tells
384 frame chain to not bother trying to unwind past this frame. */
387 mn10300_analyze_prologue (struct frame_info
*fi
, CORE_ADDR pc
)
389 CORE_ADDR func_addr
, func_end
, addr
, stop
;
390 CORE_ADDR stack_size
;
392 unsigned char buf
[4];
393 int status
, movm_args
= 0;
396 /* Use the PC in the frame if it's provided to look up the
397 start of this function. */
398 pc
= (fi
? fi
->pc
: pc
);
400 /* Find the start of this function. */
401 status
= find_pc_partial_function (pc
, &name
, &func_addr
, &func_end
);
403 /* Do nothing if we couldn't find the start of this function or if we're
404 stopped at the first instruction in the prologue. */
410 /* If we're in start, then give up. */
411 if (strcmp (name
, "start") == 0)
414 fi
->extra_info
->status
= NO_MORE_FRAMES
;
418 /* At the start of a function our frame is in the stack pointer. */
420 fi
->extra_info
->status
= MY_FRAME_IN_SP
;
422 /* Get the next two bytes into buf, we need two because rets is a two
423 byte insn and the first isn't enough to uniquely identify it. */
424 status
= read_memory_nobpt (pc
, buf
, 2);
428 /* If we're physically on an "rets" instruction, then our frame has
429 already been deallocated. Note this can also be true for retf
430 and ret if they specify a size of zero.
432 In this case fi->frame is bogus, we need to fix it. */
433 if (fi
&& buf
[0] == 0xf0 && buf
[1] == 0xfc)
435 if (fi
->next
== NULL
)
436 fi
->frame
= read_sp ();
440 /* Similarly if we're stopped on the first insn of a prologue as our
441 frame hasn't been allocated yet. */
442 if (fi
&& fi
->pc
== func_addr
)
444 if (fi
->next
== NULL
)
445 fi
->frame
= read_sp ();
449 /* Figure out where to stop scanning. */
450 stop
= fi
? fi
->pc
: func_end
;
452 /* Don't walk off the end of the function. */
453 stop
= stop
> func_end
? func_end
: stop
;
455 /* Start scanning on the first instruction of this function. */
458 /* Suck in two bytes. */
459 status
= read_memory_nobpt (addr
, buf
, 2);
462 fix_frame_pointer (fi
, 0);
466 /* First see if this insn sets the stack pointer from a register; if
467 so, it's probably the initialization of the stack pointer in _start,
468 so mark this as the bottom-most frame. */
469 if (buf
[0] == 0xf2 && (buf
[1] & 0xf3) == 0xf0)
472 fi
->extra_info
->status
= NO_MORE_FRAMES
;
476 /* Now look for movm [regs],sp, which saves the callee saved registers.
478 At this time we don't know if fi->frame is valid, so we only note
479 that we encountered a movm instruction. Later, we'll set the entries
480 in fsr.regs as needed. */
483 /* Extract the register list for the movm instruction. */
484 status
= read_memory_nobpt (addr
+ 1, buf
, 1);
489 /* Quit now if we're beyond the stop point. */
492 /* Fix fi->frame since it's bogus at this point. */
493 if (fi
&& fi
->next
== NULL
)
494 fi
->frame
= read_sp ();
496 /* Note if/where callee saved registers were saved. */
497 set_movm_offsets (fi
, movm_args
);
501 /* Get the next two bytes so the prologue scan can continue. */
502 status
= read_memory_nobpt (addr
, buf
, 2);
505 /* Fix fi->frame since it's bogus at this point. */
506 if (fi
&& fi
->next
== NULL
)
507 fi
->frame
= read_sp ();
509 /* Note if/where callee saved registers were saved. */
510 set_movm_offsets (fi
, movm_args
);
515 /* Now see if we set up a frame pointer via "mov sp,a3" */
520 /* The frame pointer is now valid. */
523 fi
->extra_info
->status
|= MY_FRAME_IN_FP
;
524 fi
->extra_info
->status
&= ~MY_FRAME_IN_SP
;
527 /* Quit now if we're beyond the stop point. */
530 /* Fix fi->frame if it's bogus at this point. */
531 fix_frame_pointer (fi
, 0);
533 /* Note if/where callee saved registers were saved. */
534 set_movm_offsets (fi
, movm_args
);
538 /* Get two more bytes so scanning can continue. */
539 status
= read_memory_nobpt (addr
, buf
, 2);
542 /* Fix fi->frame if it's bogus at this point. */
543 fix_frame_pointer (fi
, 0);
545 /* Note if/where callee saved registers were saved. */
546 set_movm_offsets (fi
, movm_args
);
551 /* Next we should allocate the local frame. No more prologue insns
552 are found after allocating the local frame.
554 Search for add imm8,sp (0xf8feXX)
555 or add imm16,sp (0xfafeXXXX)
556 or add imm32,sp (0xfcfeXXXXXXXX).
558 If none of the above was found, then this prologue has no
561 status
= read_memory_nobpt (addr
, buf
, 2);
564 /* Fix fi->frame if it's bogus at this point. */
565 fix_frame_pointer (fi
, 0);
567 /* Note if/where callee saved registers were saved. */
568 set_movm_offsets (fi
, movm_args
);
573 if (buf
[0] == 0xf8 && buf
[1] == 0xfe)
575 else if (buf
[0] == 0xfa && buf
[1] == 0xfe)
577 else if (buf
[0] == 0xfc && buf
[1] == 0xfe)
582 /* Suck in imm_size more bytes, they'll hold the size of the
584 status
= read_memory_nobpt (addr
+ 2, buf
, imm_size
);
587 /* Fix fi->frame if it's bogus at this point. */
588 fix_frame_pointer (fi
, 0);
590 /* Note if/where callee saved registers were saved. */
591 set_movm_offsets (fi
, movm_args
);
595 /* Note the size of the stack in the frame info structure. */
596 stack_size
= extract_signed_integer (buf
, imm_size
);
598 fi
->extra_info
->stack_size
= stack_size
;
600 /* We just consumed 2 + imm_size bytes. */
601 addr
+= 2 + imm_size
;
603 /* No more prologue insns follow, so begin preparation to return. */
604 /* Fix fi->frame if it's bogus at this point. */
605 fix_frame_pointer (fi
, stack_size
);
607 /* Note if/where callee saved registers were saved. */
608 set_movm_offsets (fi
, movm_args
);
612 /* We never found an insn which allocates local stack space, regardless
613 this is the end of the prologue. */
614 /* Fix fi->frame if it's bogus at this point. */
615 fix_frame_pointer (fi
, 0);
617 /* Note if/where callee saved registers were saved. */
618 set_movm_offsets (fi
, movm_args
);
623 /* Function: saved_regs_size
624 Return the size in bytes of the register save area, based on the
625 saved_regs array in FI. */
627 saved_regs_size (struct frame_info
*fi
)
632 /* Reserve four bytes for every register saved. */
633 for (i
= 0; i
< NUM_REGS
; i
++)
634 if (fi
->saved_regs
[i
])
637 /* If we saved LIR, then it's most likely we used a `movm'
638 instruction with the `other' bit set, in which case the SP is
639 decremented by an extra four bytes, "to simplify calculation
640 of the transfer area", according to the processor manual. */
641 if (fi
->saved_regs
[LIR_REGNUM
])
648 /* Function: frame_chain
649 Figure out and return the caller's frame pointer given current
652 We don't handle dummy frames yet but we would probably just return the
653 stack pointer that was in use at the time the function call was made? */
656 mn10300_frame_chain (struct frame_info
*fi
)
658 struct frame_info
*dummy
;
659 /* Walk through the prologue to determine the stack size,
660 location of saved registers, end of the prologue, etc. */
661 if (fi
->extra_info
->status
== 0)
662 mn10300_analyze_prologue (fi
, (CORE_ADDR
) 0);
664 /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */
665 if (fi
->extra_info
->status
& NO_MORE_FRAMES
)
668 /* Now that we've analyzed our prologue, determine the frame
669 pointer for our caller.
671 If our caller has a frame pointer, then we need to
672 find the entry value of $a3 to our function.
674 If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory
675 location pointed to by fsr.regs[A3_REGNUM].
677 Else it's still in $a3.
679 If our caller does not have a frame pointer, then his
680 frame base is fi->frame + -caller's stack size. */
682 /* The easiest way to get that info is to analyze our caller's frame.
683 So we set up a dummy frame and call mn10300_analyze_prologue to
684 find stuff for us. */
685 dummy
= analyze_dummy_frame (FRAME_SAVED_PC (fi
), fi
->frame
);
687 if (dummy
->extra_info
->status
& MY_FRAME_IN_FP
)
689 /* Our caller has a frame pointer. So find the frame in $a3 or
691 if (fi
->saved_regs
[A3_REGNUM
])
692 return (read_memory_integer (fi
->saved_regs
[A3_REGNUM
], REGISTER_SIZE
));
694 return read_register (A3_REGNUM
);
698 int adjust
= saved_regs_size (fi
);
700 /* Our caller does not have a frame pointer. So his frame starts
701 at the base of our frame (fi->frame) + register save space
703 return fi
->frame
+ adjust
+ -dummy
->extra_info
->stack_size
;
707 /* Function: skip_prologue
708 Return the address of the first inst past the prologue of the function. */
711 mn10300_skip_prologue (CORE_ADDR pc
)
713 /* We used to check the debug symbols, but that can lose if
714 we have a null prologue. */
715 return mn10300_analyze_prologue (NULL
, pc
);
718 /* generic_pop_current_frame calls this function if the current
719 frame isn't a dummy frame. */
721 mn10300_pop_frame_regular (struct frame_info
*frame
)
725 write_register (PC_REGNUM
, FRAME_SAVED_PC (frame
));
727 /* Restore any saved registers. */
728 for (regnum
= 0; regnum
< NUM_REGS
; regnum
++)
729 if (frame
->saved_regs
[regnum
] != 0)
733 value
= read_memory_unsigned_integer (frame
->saved_regs
[regnum
],
734 REGISTER_RAW_SIZE (regnum
));
735 write_register (regnum
, value
);
738 /* Actually cut back the stack. */
739 write_register (SP_REGNUM
, FRAME_FP (frame
));
741 /* Don't we need to set the PC?!? XXX FIXME. */
744 /* Function: pop_frame
745 This routine gets called when either the user uses the `return'
746 command, or the call dummy breakpoint gets hit. */
748 mn10300_pop_frame (void)
750 /* This function checks for and handles generic dummy frames, and
751 calls back to our function for ordinary frames. */
752 generic_pop_current_frame (mn10300_pop_frame_regular
);
754 /* Throw away any cached frame information. */
755 flush_cached_frames ();
758 /* Function: push_arguments
759 Setup arguments for a call to the target. Arguments go in
760 order on the stack. */
763 mn10300_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
764 int struct_return
, CORE_ADDR struct_addr
)
768 int stack_offset
= 0;
769 int regsused
= struct_return
? 1 : 0;
771 /* This should be a nop, but align the stack just in case something
772 went wrong. Stacks are four byte aligned on the mn10300. */
775 /* Now make space on the stack for the args.
777 XXX This doesn't appear to handle pass-by-invisible reference
779 for (argnum
= 0; argnum
< nargs
; argnum
++)
781 int arg_length
= (TYPE_LENGTH (VALUE_TYPE (args
[argnum
])) + 3) & ~3;
783 while (regsused
< 2 && arg_length
> 0)
791 /* Allocate stack space. */
794 regsused
= struct_return
? 1 : 0;
795 /* Push all arguments onto the stack. */
796 for (argnum
= 0; argnum
< nargs
; argnum
++)
801 /* XXX Check this. What about UNIONS? */
802 if (TYPE_CODE (VALUE_TYPE (*args
)) == TYPE_CODE_STRUCT
803 && TYPE_LENGTH (VALUE_TYPE (*args
)) > 8)
805 /* XXX Wrong, we want a pointer to this argument. */
806 len
= TYPE_LENGTH (VALUE_TYPE (*args
));
807 val
= (char *) VALUE_CONTENTS (*args
);
811 len
= TYPE_LENGTH (VALUE_TYPE (*args
));
812 val
= (char *) VALUE_CONTENTS (*args
);
815 while (regsused
< 2 && len
> 0)
817 write_register (regsused
, extract_unsigned_integer (val
, 4));
825 write_memory (sp
+ stack_offset
, val
, 4);
834 /* Make space for the flushback area. */
839 /* Function: push_return_address (pc)
840 Set up the return address for the inferior function call.
841 Needed for targets where we don't actually execute a JSR/BSR instruction */
844 mn10300_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
846 unsigned char buf
[4];
848 store_unsigned_integer (buf
, 4, CALL_DUMMY_ADDRESS ());
849 write_memory (sp
- 4, buf
, 4);
853 /* Function: store_struct_return (addr,sp)
854 Store the structure value return address for an inferior function
858 mn10300_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
860 /* The structure return address is passed as the first argument. */
861 write_register (0, addr
);
864 /* Function: frame_saved_pc
865 Find the caller of this frame. We do this by seeing if RP_REGNUM
866 is saved in the stack anywhere, otherwise we get it from the
867 registers. If the inner frame is a dummy frame, return its PC
868 instead of RP, because that's where "caller" of the dummy-frame
872 mn10300_frame_saved_pc (struct frame_info
*fi
)
874 int adjust
= saved_regs_size (fi
);
876 return (read_memory_integer (fi
->frame
+ adjust
, REGISTER_SIZE
));
879 /* Function: mn10300_init_extra_frame_info
880 Setup the frame's frame pointer, pc, and frame addresses for saved
881 registers. Most of the work is done in mn10300_analyze_prologue().
883 Note that when we are called for the last frame (currently active frame),
884 that fi->pc and fi->frame will already be setup. However, fi->frame will
885 be valid only if this routine uses FP. For previous frames, fi-frame will
886 always be correct. mn10300_analyze_prologue will fix fi->frame if
889 We can be called with the PC in the call dummy under two circumstances.
890 First, during normal backtracing, second, while figuring out the frame
891 pointer just prior to calling the target function (see run_stack_dummy). */
894 mn10300_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
897 fi
->pc
= FRAME_SAVED_PC (fi
->next
);
899 frame_saved_regs_zalloc (fi
);
900 fi
->extra_info
= (struct frame_extra_info
*)
901 frame_obstack_alloc (sizeof (struct frame_extra_info
));
903 fi
->extra_info
->status
= 0;
904 fi
->extra_info
->stack_size
= 0;
906 mn10300_analyze_prologue (fi
, 0);
910 /* This function's job is handled by init_extra_frame_info. */
912 mn10300_frame_init_saved_regs (struct frame_info
*frame
)
917 /* Function: mn10300_virtual_frame_pointer
918 Return the register that the function uses for a frame pointer,
919 plus any necessary offset to be applied to the register before
920 any frame pointer offsets. */
923 mn10300_virtual_frame_pointer (CORE_ADDR pc
,
927 struct frame_info
*dummy
= analyze_dummy_frame (pc
, 0);
928 /* Set up a dummy frame_info, Analyze the prolog and fill in the
930 /* Results will tell us which type of frame it uses. */
931 if (dummy
->extra_info
->status
& MY_FRAME_IN_SP
)
934 *offset
= -(dummy
->extra_info
->stack_size
);
944 mn10300_reg_struct_has_addr (int gcc_p
, struct type
*type
)
946 return (TYPE_LENGTH (type
) > 8);
950 mn10300_register_virtual_type (int reg
)
952 return builtin_type_int
;
956 mn10300_register_byte (int reg
)
962 mn10300_register_virtual_size (int reg
)
968 mn10300_register_raw_size (int reg
)
973 /* If DWARF2 is a register number appearing in Dwarf2 debug info, then
974 mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
975 register number. Why don't Dwarf2 and GDB use the same numbering?
976 Who knows? But since people have object files lying around with
977 the existing Dwarf2 numbering, and other people have written stubs
978 to work with the existing GDB, neither of them can change. So we
979 just have to cope. */
981 mn10300_dwarf2_reg_to_regnum (int dwarf2
)
983 /* This table is supposed to be shaped like the REGISTER_NAMES
984 initializer in gcc/config/mn10300/mn10300.h. Registers which
985 appear in GCC's numbering, but have no counterpart in GDB's
986 world, are marked with a -1. */
987 static int dwarf2_to_gdb
[] = {
988 0, 1, 2, 3, 4, 5, 6, 7, -1, 8,
989 15, 16, 17, 18, 19, 20, 21, 22
994 || dwarf2
>= (sizeof (dwarf2_to_gdb
) / sizeof (dwarf2_to_gdb
[0]))
995 || dwarf2_to_gdb
[dwarf2
] == -1)
996 internal_error (__FILE__
, __LINE__
,
997 "bogus register number in debug info: %d", dwarf2
);
999 return dwarf2_to_gdb
[dwarf2
];
1003 mn10300_print_register (const char *name
, int regnum
, int reg_width
)
1005 char *raw_buffer
= alloca (MAX_REGISTER_RAW_SIZE
);
1008 printf_filtered ("%*s: ", reg_width
, name
);
1010 printf_filtered ("%s: ", name
);
1013 if (read_relative_register_raw_bytes (regnum
, raw_buffer
))
1015 printf_filtered ("[invalid]");
1021 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
1023 for (byte
= REGISTER_RAW_SIZE (regnum
) - REGISTER_VIRTUAL_SIZE (regnum
);
1024 byte
< REGISTER_RAW_SIZE (regnum
);
1026 printf_filtered ("%02x", (unsigned char) raw_buffer
[byte
]);
1030 for (byte
= REGISTER_VIRTUAL_SIZE (regnum
) - 1;
1033 printf_filtered ("%02x", (unsigned char) raw_buffer
[byte
]);
1039 mn10300_do_registers_info (int regnum
, int fpregs
)
1043 const char *name
= REGISTER_NAME (regnum
);
1044 if (name
== NULL
|| name
[0] == '\0')
1045 error ("Not a valid register for the current processor type");
1046 mn10300_print_register (name
, regnum
, 0);
1047 printf_filtered ("\n");
1051 /* print registers in an array 4x8 */
1054 const int nr_in_row
= 4;
1055 const int reg_width
= 4;
1056 for (r
= 0; r
< NUM_REGS
; r
+= nr_in_row
)
1061 for (c
= r
; c
< r
+ nr_in_row
; c
++)
1063 const char *name
= REGISTER_NAME (c
);
1064 if (name
!= NULL
&& *name
!= '\0')
1069 printf_filtered (" ");
1072 mn10300_print_register (name
, c
, reg_width
);
1073 printf_filtered (" ");
1077 padding
+= (reg_width
+ 2 + 8 + 1);
1081 printf_filtered ("\n");
1086 /* Dump out the mn10300 speciic architecture information. */
1089 mn10300_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
1091 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
1092 fprintf_unfiltered (file
, "mn10300_dump_tdep: am33_mode = %d\n",
1096 static struct gdbarch
*
1097 mn10300_gdbarch_init (struct gdbarch_info info
,
1098 struct gdbarch_list
*arches
)
1100 static LONGEST mn10300_call_dummy_words
[] = { 0 };
1101 struct gdbarch
*gdbarch
;
1102 struct gdbarch_tdep
*tdep
= NULL
;
1104 gdbarch_register_name_ftype
*register_name
;
1108 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
1110 return arches
->gdbarch
;
1111 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
1112 gdbarch
= gdbarch_alloc (&info
, tdep
);
1114 if (info
.bfd_arch_info
!= NULL
1115 && info
.bfd_arch_info
->arch
== bfd_arch_mn10300
)
1116 mach
= info
.bfd_arch_info
->mach
;
1122 case bfd_mach_mn10300
:
1124 register_name
= mn10300_generic_register_name
;
1129 register_name
= am33_register_name
;
1133 internal_error (__FILE__
, __LINE__
,
1134 "mn10300_gdbarch_init: Unknown mn10300 variant");
1135 return NULL
; /* keep GCC happy. */
1139 set_gdbarch_num_regs (gdbarch
, num_regs
);
1140 set_gdbarch_register_name (gdbarch
, register_name
);
1141 set_gdbarch_register_size (gdbarch
, 4);
1142 set_gdbarch_register_bytes (gdbarch
,
1143 num_regs
* gdbarch_register_size (gdbarch
));
1144 set_gdbarch_max_register_raw_size (gdbarch
, 4);
1145 set_gdbarch_register_raw_size (gdbarch
, mn10300_register_raw_size
);
1146 set_gdbarch_register_byte (gdbarch
, mn10300_register_byte
);
1147 set_gdbarch_max_register_virtual_size (gdbarch
, 4);
1148 set_gdbarch_register_virtual_size (gdbarch
, mn10300_register_virtual_size
);
1149 set_gdbarch_register_virtual_type (gdbarch
, mn10300_register_virtual_type
);
1150 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, mn10300_dwarf2_reg_to_regnum
);
1151 set_gdbarch_do_registers_info (gdbarch
, mn10300_do_registers_info
);
1152 set_gdbarch_sp_regnum (gdbarch
, 8);
1153 set_gdbarch_pc_regnum (gdbarch
, 9);
1154 set_gdbarch_fp_regnum (gdbarch
, 31);
1155 set_gdbarch_virtual_frame_pointer (gdbarch
, mn10300_virtual_frame_pointer
);
1158 set_gdbarch_breakpoint_from_pc (gdbarch
, mn10300_breakpoint_from_pc
);
1159 set_gdbarch_function_start_offset (gdbarch
, 0);
1160 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
1162 /* Stack unwinding. */
1163 set_gdbarch_get_saved_register (gdbarch
, generic_get_saved_register
);
1164 set_gdbarch_frame_chain_valid (gdbarch
, generic_file_frame_chain_valid
);
1165 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1166 set_gdbarch_frame_chain_valid (gdbarch
, generic_file_frame_chain_valid
);
1167 set_gdbarch_saved_pc_after_call (gdbarch
, mn10300_saved_pc_after_call
);
1168 set_gdbarch_init_extra_frame_info (gdbarch
, mn10300_init_extra_frame_info
);
1169 set_gdbarch_init_frame_pc (gdbarch
, init_frame_pc_noop
);
1170 set_gdbarch_frame_init_saved_regs (gdbarch
, mn10300_frame_init_saved_regs
);
1171 set_gdbarch_frame_chain (gdbarch
, mn10300_frame_chain
);
1172 set_gdbarch_frame_saved_pc (gdbarch
, mn10300_frame_saved_pc
);
1173 set_gdbarch_extract_return_value (gdbarch
, mn10300_extract_return_value
);
1174 set_gdbarch_extract_struct_value_address
1175 (gdbarch
, mn10300_extract_struct_value_address
);
1176 set_gdbarch_store_return_value (gdbarch
, mn10300_store_return_value
);
1177 set_gdbarch_store_struct_return (gdbarch
, mn10300_store_struct_return
);
1178 set_gdbarch_pop_frame (gdbarch
, mn10300_pop_frame
);
1179 set_gdbarch_skip_prologue (gdbarch
, mn10300_skip_prologue
);
1180 set_gdbarch_frame_args_skip (gdbarch
, 0);
1181 set_gdbarch_frame_args_address (gdbarch
, default_frame_address
);
1182 set_gdbarch_frame_locals_address (gdbarch
, default_frame_address
);
1183 set_gdbarch_frame_num_args (gdbarch
, frame_num_args_unknown
);
1184 /* That's right, we're using the stack pointer as our frame pointer. */
1185 set_gdbarch_read_fp (gdbarch
, generic_target_read_sp
);
1187 /* Calling functions in the inferior from GDB. */
1188 set_gdbarch_call_dummy_p (gdbarch
, 1);
1189 set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch
, 1);
1190 set_gdbarch_call_dummy_breakpoint_offset (gdbarch
, 0);
1191 set_gdbarch_call_dummy_stack_adjust_p (gdbarch
, 0);
1192 set_gdbarch_call_dummy_location (gdbarch
, AT_ENTRY_POINT
);
1193 set_gdbarch_call_dummy_address (gdbarch
, entry_point_address
);
1194 set_gdbarch_call_dummy_words (gdbarch
, mn10300_call_dummy_words
);
1195 set_gdbarch_sizeof_call_dummy_words (gdbarch
,
1196 sizeof (mn10300_call_dummy_words
));
1197 set_gdbarch_call_dummy_length (gdbarch
, 0);
1198 set_gdbarch_fix_call_dummy (gdbarch
, generic_fix_call_dummy
);
1199 set_gdbarch_call_dummy_start_offset (gdbarch
, 0);
1200 set_gdbarch_pc_in_call_dummy (gdbarch
, pc_in_call_dummy_at_entry_point
);
1201 set_gdbarch_use_generic_dummy_frames (gdbarch
, 1);
1202 set_gdbarch_push_dummy_frame (gdbarch
, generic_push_dummy_frame
);
1203 set_gdbarch_push_arguments (gdbarch
, mn10300_push_arguments
);
1204 set_gdbarch_reg_struct_has_addr (gdbarch
, mn10300_reg_struct_has_addr
);
1205 set_gdbarch_push_return_address (gdbarch
, mn10300_push_return_address
);
1206 set_gdbarch_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
1207 set_gdbarch_use_struct_convention (gdbarch
, mn10300_use_struct_convention
);
1209 tdep
->am33_mode
= am33_mode
;
1215 _initialize_mn10300_tdep (void)
1217 /* printf("_initialize_mn10300_tdep\n"); */
1219 tm_print_insn
= print_insn_mn10300
;
1221 register_gdbarch_init (bfd_arch_mn10300
, mn10300_gdbarch_init
);