1 /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
4 2007, 2008 Free Software Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>. */
22 #include "arch-utils.h"
26 #include "gdb_string.h"
27 #include "gdb_assert.h"
28 #include "gdbcore.h" /* for write_memory_unsigned_integer */
32 #include "frame-unwind.h"
33 #include "frame-base.h"
34 #include "trad-frame.h"
36 #include "dwarf2-frame.h"
39 #include "mn10300-tdep.h"
42 extern struct trad_frame_cache
*mn10300_frame_unwind_cache (struct frame_info
*,
45 /* Compute the alignment required by a type. */
48 mn10300_type_align (struct type
*type
)
52 switch (TYPE_CODE (type
))
63 return TYPE_LENGTH (type
);
65 case TYPE_CODE_COMPLEX
:
66 return TYPE_LENGTH (type
) / 2;
68 case TYPE_CODE_STRUCT
:
70 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
72 int falign
= mn10300_type_align (TYPE_FIELD_TYPE (type
, i
));
73 while (align
< falign
)
79 /* HACK! Structures containing arrays, even small ones, are not
80 elligible for returning in registers. */
83 case TYPE_CODE_TYPEDEF
:
84 return mn10300_type_align (check_typedef (type
));
87 internal_error (__FILE__
, __LINE__
, _("bad switch"));
91 /* Should call_function allocate stack space for a struct return? */
93 mn10300_use_struct_convention (struct type
*type
)
95 /* Structures bigger than a pair of words can't be returned in
97 if (TYPE_LENGTH (type
) > 8)
100 switch (TYPE_CODE (type
))
102 case TYPE_CODE_STRUCT
:
103 case TYPE_CODE_UNION
:
104 /* Structures with a single field are handled as the field
106 if (TYPE_NFIELDS (type
) == 1)
107 return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type
, 0));
109 /* Structures with word or double-word size are passed in memory, as
110 long as they require at least word alignment. */
111 if (mn10300_type_align (type
) >= 4)
116 /* Arrays are addressable, so they're never returned in
117 registers. This condition can only hold when the array is
118 the only field of a struct or union. */
119 case TYPE_CODE_ARRAY
:
122 case TYPE_CODE_TYPEDEF
:
123 return mn10300_use_struct_convention (check_typedef (type
));
131 mn10300_store_return_value (struct gdbarch
*gdbarch
, struct type
*type
,
132 struct regcache
*regcache
, const void *valbuf
)
134 int len
= TYPE_LENGTH (type
);
137 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
142 regsz
= register_size (gdbarch
, reg
);
145 regcache_raw_write_part (regcache
, reg
, 0, len
, valbuf
);
146 else if (len
<= 2 * regsz
)
148 regcache_raw_write (regcache
, reg
, valbuf
);
149 gdb_assert (regsz
== register_size (gdbarch
, reg
+ 1));
150 regcache_raw_write_part (regcache
, reg
+1, 0,
151 len
- regsz
, (char *) valbuf
+ regsz
);
154 internal_error (__FILE__
, __LINE__
,
155 _("Cannot store return value %d bytes long."), len
);
159 mn10300_extract_return_value (struct gdbarch
*gdbarch
, struct type
*type
,
160 struct regcache
*regcache
, void *valbuf
)
162 char buf
[MAX_REGISTER_SIZE
];
163 int len
= TYPE_LENGTH (type
);
166 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
171 regsz
= register_size (gdbarch
, reg
);
174 regcache_raw_read (regcache
, reg
, buf
);
175 memcpy (valbuf
, buf
, len
);
177 else if (len
<= 2 * regsz
)
179 regcache_raw_read (regcache
, reg
, buf
);
180 memcpy (valbuf
, buf
, regsz
);
181 gdb_assert (regsz
== register_size (gdbarch
, reg
+ 1));
182 regcache_raw_read (regcache
, reg
+ 1, buf
);
183 memcpy ((char *) valbuf
+ regsz
, buf
, len
- regsz
);
186 internal_error (__FILE__
, __LINE__
,
187 _("Cannot extract return value %d bytes long."), len
);
190 /* Determine, for architecture GDBARCH, how a return value of TYPE
191 should be returned. If it is supposed to be returned in registers,
192 and READBUF is non-zero, read the appropriate value from REGCACHE,
193 and copy it into READBUF. If WRITEBUF is non-zero, write the value
194 from WRITEBUF into REGCACHE. */
196 static enum return_value_convention
197 mn10300_return_value (struct gdbarch
*gdbarch
, struct type
*type
,
198 struct regcache
*regcache
, gdb_byte
*readbuf
,
199 const gdb_byte
*writebuf
)
201 if (mn10300_use_struct_convention (type
))
202 return RETURN_VALUE_STRUCT_CONVENTION
;
205 mn10300_extract_return_value (gdbarch
, type
, regcache
, readbuf
);
207 mn10300_store_return_value (gdbarch
, type
, regcache
, writebuf
);
209 return RETURN_VALUE_REGISTER_CONVENTION
;
213 register_name (int reg
, char **regs
, long sizeof_regs
)
215 if (reg
< 0 || reg
>= sizeof_regs
/ sizeof (regs
[0]))
222 mn10300_generic_register_name (struct gdbarch
*gdbarch
, int reg
)
224 static char *regs
[] =
225 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
226 "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
227 "", "", "", "", "", "", "", "",
228 "", "", "", "", "", "", "", "fp"
230 return register_name (reg
, regs
, sizeof regs
);
235 am33_register_name (struct gdbarch
*gdbarch
, int reg
)
237 static char *regs
[] =
238 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
239 "sp", "pc", "mdr", "psw", "lir", "lar", "",
240 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
241 "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""
243 return register_name (reg
, regs
, sizeof regs
);
247 am33_2_register_name (struct gdbarch
*gdbarch
, int reg
)
249 static char *regs
[] =
251 "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
252 "sp", "pc", "mdr", "psw", "lir", "lar", "mdrq", "r0",
253 "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ssp",
254 "msp", "usp", "mcrh", "mcrl", "mcvf", "fpcr", "", "",
255 "fs0", "fs1", "fs2", "fs3", "fs4", "fs5", "fs6", "fs7",
256 "fs8", "fs9", "fs10", "fs11", "fs12", "fs13", "fs14", "fs15",
257 "fs16", "fs17", "fs18", "fs19", "fs20", "fs21", "fs22", "fs23",
258 "fs24", "fs25", "fs26", "fs27", "fs28", "fs29", "fs30", "fs31"
260 return register_name (reg
, regs
, sizeof regs
);
264 mn10300_register_type (struct gdbarch
*gdbarch
, int reg
)
266 return builtin_type_int
;
270 mn10300_read_pc (struct regcache
*regcache
)
273 regcache_cooked_read_unsigned (regcache
, E_PC_REGNUM
, &val
);
278 mn10300_write_pc (struct regcache
*regcache
, CORE_ADDR val
)
280 regcache_cooked_write_unsigned (regcache
, E_PC_REGNUM
, val
);
283 /* The breakpoint instruction must be the same size as the smallest
284 instruction in the instruction set.
286 The Matsushita mn10x00 processors have single byte instructions
287 so we need a single byte breakpoint. Matsushita hasn't defined
288 one, so we defined it ourselves. */
290 const static unsigned char *
291 mn10300_breakpoint_from_pc (struct gdbarch
*gdbarch
, CORE_ADDR
*bp_addr
,
294 static char breakpoint
[] = {0xff};
299 /* Set offsets of saved registers.
300 This is a helper function for mn10300_analyze_prologue. */
303 set_reg_offsets (struct frame_info
*fi
,
307 int stack_extra_size
,
310 struct gdbarch
*gdbarch
;
311 struct trad_frame_cache
*cache
;
315 if (fi
== NULL
|| this_cache
== NULL
)
318 cache
= mn10300_frame_unwind_cache (fi
, this_cache
);
321 gdbarch
= get_frame_arch (fi
);
325 base
= frame_unwind_register_unsigned (fi
, E_A3_REGNUM
);
329 base
= frame_unwind_register_unsigned (fi
, E_SP_REGNUM
)
333 trad_frame_set_this_base (cache
, base
);
335 if (AM33_MODE (gdbarch
) == 2)
337 /* If bit N is set in fpregmask, fsN is saved on the stack.
338 The floating point registers are saved in ascending order.
339 For example: fs16 <- Frame Pointer
340 fs17 Frame Pointer + 4 */
344 for (i
= 0; i
< 32; i
++)
346 if (fpregmask
& (1 << i
))
348 trad_frame_set_reg_addr (cache
, E_FS0_REGNUM
+ i
,
357 if (movm_args
& movm_other_bit
)
359 /* The `other' bit leaves a blank area of four bytes at the
360 beginning of its block of saved registers, making it 32 bytes
362 trad_frame_set_reg_addr (cache
, E_LAR_REGNUM
, base
+ offset
+ 4);
363 trad_frame_set_reg_addr (cache
, E_LIR_REGNUM
, base
+ offset
+ 8);
364 trad_frame_set_reg_addr (cache
, E_MDR_REGNUM
, base
+ offset
+ 12);
365 trad_frame_set_reg_addr (cache
, E_A0_REGNUM
+ 1, base
+ offset
+ 16);
366 trad_frame_set_reg_addr (cache
, E_A0_REGNUM
, base
+ offset
+ 20);
367 trad_frame_set_reg_addr (cache
, E_D0_REGNUM
+ 1, base
+ offset
+ 24);
368 trad_frame_set_reg_addr (cache
, E_D0_REGNUM
, base
+ offset
+ 28);
372 if (movm_args
& movm_a3_bit
)
374 trad_frame_set_reg_addr (cache
, E_A3_REGNUM
, base
+ offset
);
377 if (movm_args
& movm_a2_bit
)
379 trad_frame_set_reg_addr (cache
, E_A2_REGNUM
, base
+ offset
);
382 if (movm_args
& movm_d3_bit
)
384 trad_frame_set_reg_addr (cache
, E_D3_REGNUM
, base
+ offset
);
387 if (movm_args
& movm_d2_bit
)
389 trad_frame_set_reg_addr (cache
, E_D2_REGNUM
, base
+ offset
);
392 if (AM33_MODE (gdbarch
))
394 if (movm_args
& movm_exother_bit
)
396 trad_frame_set_reg_addr (cache
, E_MCVF_REGNUM
, base
+ offset
);
397 trad_frame_set_reg_addr (cache
, E_MCRL_REGNUM
, base
+ offset
+ 4);
398 trad_frame_set_reg_addr (cache
, E_MCRH_REGNUM
, base
+ offset
+ 8);
399 trad_frame_set_reg_addr (cache
, E_MDRQ_REGNUM
, base
+ offset
+ 12);
400 trad_frame_set_reg_addr (cache
, E_E1_REGNUM
, base
+ offset
+ 16);
401 trad_frame_set_reg_addr (cache
, E_E0_REGNUM
, base
+ offset
+ 20);
404 if (movm_args
& movm_exreg1_bit
)
406 trad_frame_set_reg_addr (cache
, E_E7_REGNUM
, base
+ offset
);
407 trad_frame_set_reg_addr (cache
, E_E6_REGNUM
, base
+ offset
+ 4);
408 trad_frame_set_reg_addr (cache
, E_E5_REGNUM
, base
+ offset
+ 8);
409 trad_frame_set_reg_addr (cache
, E_E4_REGNUM
, base
+ offset
+ 12);
412 if (movm_args
& movm_exreg0_bit
)
414 trad_frame_set_reg_addr (cache
, E_E3_REGNUM
, base
+ offset
);
415 trad_frame_set_reg_addr (cache
, E_E2_REGNUM
, base
+ offset
+ 4);
419 /* The last (or first) thing on the stack will be the PC. */
420 trad_frame_set_reg_addr (cache
, E_PC_REGNUM
, base
+ offset
);
421 /* Save the SP in the 'traditional' way.
422 This will be the same location where the PC is saved. */
423 trad_frame_set_reg_value (cache
, E_SP_REGNUM
, base
+ offset
);
426 /* The main purpose of this file is dealing with prologues to extract
427 information about stack frames and saved registers.
429 In gcc/config/mn13000/mn10300.c, the expand_prologue prologue
430 function is pretty readable, and has a nice explanation of how the
431 prologue is generated. The prologues generated by that code will
432 have the following form (NOTE: the current code doesn't handle all
435 + If this is an old-style varargs function, then its arguments
436 need to be flushed back to the stack:
441 + If we use any of the callee-saved registers, save them now.
443 movm [some callee-saved registers],(sp)
445 + If we have any floating-point registers to save:
447 - Decrement the stack pointer to reserve space for the registers.
448 If the function doesn't need a frame pointer, we may combine
449 this with the adjustment that reserves space for the frame.
453 - Save the floating-point registers. We have two possible
456 . Save them at fixed offset from the SP:
458 fmov fsN,(OFFSETN,sp)
459 fmov fsM,(OFFSETM,sp)
462 Note that, if OFFSETN happens to be zero, you'll get the
463 different opcode: fmov fsN,(sp)
465 . Or, set a0 to the start of the save area, and then use
466 post-increment addressing to save the FP registers.
474 + If the function needs a frame pointer, we set it here.
478 + Now we reserve space for the stack frame proper. This could be
479 merged into the `add -SIZE, sp' instruction for FP saves up
480 above, unless we needed to set the frame pointer in the previous
481 step, or the frame is so large that allocating the whole thing at
482 once would put the FP register save slots out of reach of the
483 addressing mode (128 bytes).
487 One day we might keep the stack pointer constant, that won't
488 change the code for prologues, but it will make the frame
489 pointerless case much more common. */
491 /* Analyze the prologue to determine where registers are saved,
492 the end of the prologue, etc etc. Return the end of the prologue
495 We store into FI (if non-null) several tidbits of information:
497 * stack_size -- size of this stack frame. Note that if we stop in
498 certain parts of the prologue/epilogue we may claim the size of the
499 current frame is zero. This happens when the current frame has
500 not been allocated yet or has already been deallocated.
502 * fsr -- Addresses of registers saved in the stack by this frame.
504 * status -- A (relatively) generic status indicator. It's a bitmask
505 with the following bits:
507 MY_FRAME_IN_SP: The base of the current frame is actually in
508 the stack pointer. This can happen for frame pointerless
509 functions, or cases where we're stopped in the prologue/epilogue
510 itself. For these cases mn10300_analyze_prologue will need up
511 update fi->frame before returning or analyzing the register
514 MY_FRAME_IN_FP: The base of the current frame is in the
515 frame pointer register ($a3).
517 NO_MORE_FRAMES: Set this if the current frame is "start" or
518 if the first instruction looks like mov <imm>,sp. This tells
519 frame chain to not bother trying to unwind past this frame. */
522 mn10300_analyze_prologue (struct gdbarch
*gdbarch
, struct frame_info
*fi
,
526 CORE_ADDR func_addr
, func_end
, addr
, stop
;
527 long stack_extra_size
= 0;
529 unsigned char buf
[4];
536 /* Use the PC in the frame if it's provided to look up the
537 start of this function.
539 Note: kevinb/2003-07-16: We used to do the following here:
540 pc = (fi ? get_frame_pc (fi) : pc);
541 But this is (now) badly broken when called from analyze_dummy_frame().
545 pc
= (pc
? pc
: get_frame_pc (fi
));
548 /* Find the start of this function. */
549 status
= find_pc_partial_function (pc
, &name
, &func_addr
, &func_end
);
551 /* Do nothing if we couldn't find the start of this function
553 MVS: comment went on to say "or if we're stopped at the first
554 instruction in the prologue" -- but code doesn't reflect that,
555 and I don't want to do that anyway. */
559 goto finish_prologue
;
562 /* If we're in start, then give up. */
563 if (strcmp (name
, "start") == 0)
566 goto finish_prologue
;
569 /* Figure out where to stop scanning. */
570 stop
= fi
? pc
: func_end
;
572 /* Don't walk off the end of the function. */
573 stop
= stop
> func_end
? func_end
: stop
;
575 /* Start scanning on the first instruction of this function. */
578 /* Suck in two bytes. */
579 if (addr
+ 2 > stop
|| !safe_frame_unwind_memory (fi
, addr
, buf
, 2))
580 goto finish_prologue
;
582 /* First see if this insn sets the stack pointer from a register; if
583 so, it's probably the initialization of the stack pointer in _start,
584 so mark this as the bottom-most frame. */
585 if (buf
[0] == 0xf2 && (buf
[1] & 0xf3) == 0xf0)
587 goto finish_prologue
;
590 /* Now look for movm [regs],sp, which saves the callee saved registers.
592 At this time we don't know if fi->frame is valid, so we only note
593 that we encountered a movm instruction. Later, we'll set the entries
594 in fsr.regs as needed. */
597 /* Extract the register list for the movm instruction. */
602 /* Quit now if we're beyond the stop point. */
604 goto finish_prologue
;
606 /* Get the next two bytes so the prologue scan can continue. */
607 if (!safe_frame_unwind_memory (fi
, addr
, buf
, 2))
608 goto finish_prologue
;
611 /* Check for "mov pc, a2", an instruction found in optimized, position
612 independent code. Skip it if found. */
613 if (buf
[0] == 0xf0 && buf
[1] == 0x2e)
617 /* Quit now if we're beyond the stop point. */
619 goto finish_prologue
;
621 /* Get the next two bytes so the prologue scan can continue. */
622 status
= read_memory_nobpt (addr
, buf
, 2);
624 goto finish_prologue
;
627 if (AM33_MODE (gdbarch
) == 2)
629 /* Determine if any floating point registers are to be saved.
630 Look for one of the following three prologue formats:
632 [movm [regs],(sp)] [movm [regs],(sp)] [movm [regs],(sp)]
634 add -SIZE,sp add -SIZE,sp add -SIZE,sp
635 fmov fs#,(sp) mov sp,a0/a1 mov sp,a0/a1
636 fmov fs#,(#,sp) fmov fs#,(a0/a1+) add SIZE2,a0/a1
637 ... ... fmov fs#,(a0/a1+)
639 fmov fs#,(#,sp) fmov fs#,(a0/a1+) fmov fs#,(a0/a1+)
641 [mov sp,a3] [mov sp,a3]
642 [add -SIZE2,sp] [add -SIZE2,sp] */
644 /* Remember the address at which we started in the event that we
645 don't ultimately find an fmov instruction. Once we're certain
646 that we matched one of the above patterns, we'll set
647 ``restore_addr'' to the appropriate value. Note: At one time
648 in the past, this code attempted to not adjust ``addr'' until
649 there was a fair degree of certainty that the pattern would be
650 matched. However, that code did not wait until an fmov instruction
651 was actually encountered. As a consequence, ``addr'' would
652 sometimes be advanced even when no fmov instructions were found. */
653 CORE_ADDR restore_addr
= addr
;
656 /* First, look for add -SIZE,sp (i.e. add imm8,sp (0xf8feXX)
657 or add imm16,sp (0xfafeXXXX)
658 or add imm32,sp (0xfcfeXXXXXXXX)) */
660 if (buf
[0] == 0xf8 && buf
[1] == 0xfe)
662 else if (buf
[0] == 0xfa && buf
[1] == 0xfe)
664 else if (buf
[0] == 0xfc && buf
[1] == 0xfe)
668 /* An "add -#,sp" instruction has been found. "addr + 2 + imm_size"
669 is the address of the next instruction. Don't modify "addr" until
670 the next "floating point prologue" instruction is found. If this
671 is not a prologue that saves floating point registers we need to
672 be able to back out of this bit of code and continue with the
673 prologue analysis. */
674 if (addr
+ 2 + imm_size
< stop
)
676 if (!safe_frame_unwind_memory (fi
, addr
+ 2 + imm_size
, buf
, 3))
677 goto finish_prologue
;
678 if ((buf
[0] & 0xfc) == 0x3c)
680 /* Occasionally, especially with C++ code, the "fmov"
681 instructions will be preceded by "mov sp,aN"
682 (aN => a0, a1, a2, or a3).
684 This is a one byte instruction: mov sp,aN = 0011 11XX
685 where XX is the register number.
687 Skip this instruction by incrementing addr. The "fmov"
688 instructions will have the form "fmov fs#,(aN+)" in this
689 case, but that will not necessitate a change in the
690 "fmov" parsing logic below. */
694 if ((buf
[1] & 0xfc) == 0x20)
696 /* Occasionally, especially with C++ code compiled with
697 the -fomit-frame-pointer or -O3 options, the
698 "mov sp,aN" instruction will be followed by an
699 "add #,aN" instruction. This indicates the
700 "stack_size", the size of the portion of the stack
701 containing the arguments. This instruction format is:
702 add #,aN = 0010 00XX YYYY YYYY
703 where XX is the register number
704 YYYY YYYY is the constant.
705 Note the size of the stack (as a negative number) in
706 the frame info structure. */
708 stack_extra_size
+= -buf
[2];
714 if ((buf
[0] & 0xfc) == 0x3c ||
715 buf
[0] == 0xf9 || buf
[0] == 0xfb)
717 /* An "fmov" instruction has been found indicating that this
718 prologue saves floating point registers (or, as described
719 above, a "mov sp,aN" and possible "add #,aN" have been
720 found and we will assume an "fmov" follows). Process the
721 consecutive "fmov" instructions. */
722 for (addr
+= 2 + imm_size
;;addr
+= imm_size
)
726 /* Read the "fmov" instruction. */
728 !safe_frame_unwind_memory (fi
, addr
, buf
, 4))
729 goto finish_prologue
;
731 if (buf
[0] != 0xf9 && buf
[0] != 0xfb)
734 /* An fmov instruction has just been seen. We can
735 now really commit to the pattern match. */
739 /* Get the floating point register number from the
740 2nd and 3rd bytes of the "fmov" instruction:
741 Machine Code: 0000 00X0 YYYY 0000 =>
743 regnum
= (buf
[1] & 0x02) << 3;
744 regnum
|= ((buf
[2] & 0xf0) >> 4) & 0x0f;
746 /* Add this register number to the bit mask of floating
747 point registers that have been saved. */
748 fpregmask
|= 1 << regnum
;
750 /* Determine the length of this "fmov" instruction.
751 fmov fs#,(sp) => 3 byte instruction
752 fmov fs#,(#,sp) => 4 byte instruction */
753 imm_size
= (buf
[0] == 0xf9) ? 3 : 4;
758 /* If no fmov instructions were found by the above sequence, reset
759 the state and pretend that the above bit of code never happened. */
763 status
= read_memory_nobpt (addr
, buf
, 2);
765 goto finish_prologue
;
766 stack_extra_size
= 0;
770 /* Now see if we set up a frame pointer via "mov sp,a3" */
775 /* The frame pointer is now valid. */
781 /* Quit now if we're beyond the stop point. */
783 goto finish_prologue
;
785 /* Get two more bytes so scanning can continue. */
786 if (!safe_frame_unwind_memory (fi
, addr
, buf
, 2))
787 goto finish_prologue
;
790 /* Next we should allocate the local frame. No more prologue insns
791 are found after allocating the local frame.
793 Search for add imm8,sp (0xf8feXX)
794 or add imm16,sp (0xfafeXXXX)
795 or add imm32,sp (0xfcfeXXXXXXXX).
797 If none of the above was found, then this prologue has no
801 if (buf
[0] == 0xf8 && buf
[1] == 0xfe)
803 else if (buf
[0] == 0xfa && buf
[1] == 0xfe)
805 else if (buf
[0] == 0xfc && buf
[1] == 0xfe)
810 /* Suck in imm_size more bytes, they'll hold the size of the
812 if (!safe_frame_unwind_memory (fi
, addr
+ 2, buf
, imm_size
))
813 goto finish_prologue
;
815 /* Note the size of the stack. */
816 stack_extra_size
-= extract_signed_integer (buf
, imm_size
);
818 /* We just consumed 2 + imm_size bytes. */
819 addr
+= 2 + imm_size
;
821 /* No more prologue insns follow, so begin preparation to return. */
822 goto finish_prologue
;
824 /* Do the essentials and get out of here. */
826 /* Note if/where callee saved registers were saved. */
828 set_reg_offsets (fi
, this_cache
, movm_args
, fpregmask
, stack_extra_size
,
833 /* Function: skip_prologue
834 Return the address of the first inst past the prologue of the function. */
837 mn10300_skip_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
839 return mn10300_analyze_prologue (gdbarch
, NULL
, NULL
, pc
);
842 /* Simple frame_unwind_cache.
843 This finds the "extra info" for the frame. */
844 struct trad_frame_cache
*
845 mn10300_frame_unwind_cache (struct frame_info
*next_frame
,
846 void **this_prologue_cache
)
848 struct gdbarch
*gdbarch
;
849 struct trad_frame_cache
*cache
;
850 CORE_ADDR pc
, start
, end
;
853 if (*this_prologue_cache
)
854 return (*this_prologue_cache
);
856 gdbarch
= get_frame_arch (next_frame
);
857 cache_p
= trad_frame_cache_zalloc (next_frame
);
858 pc
= gdbarch_unwind_pc (gdbarch
, next_frame
);
859 mn10300_analyze_prologue (gdbarch
, next_frame
, &cache_p
, pc
);
862 if (find_pc_partial_function (pc
, NULL
, &start
, &end
))
863 trad_frame_set_id (cache
,
864 frame_id_build (trad_frame_get_this_base (cache
),
868 start
= frame_func_unwind (next_frame
, NORMAL_FRAME
);
869 trad_frame_set_id (cache
,
870 frame_id_build (trad_frame_get_this_base (cache
),
874 (*this_prologue_cache
) = cache
;
878 /* Here is a dummy implementation. */
879 static struct frame_id
880 mn10300_unwind_dummy_id (struct gdbarch
*gdbarch
,
881 struct frame_info
*next_frame
)
883 return frame_id_build (frame_sp_unwind (next_frame
),
884 frame_pc_unwind (next_frame
));
887 /* Trad frame implementation. */
889 mn10300_frame_this_id (struct frame_info
*next_frame
,
890 void **this_prologue_cache
,
891 struct frame_id
*this_id
)
893 struct trad_frame_cache
*cache
=
894 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
896 trad_frame_get_id (cache
, this_id
);
900 mn10300_frame_prev_register (struct frame_info
*next_frame
,
901 void **this_prologue_cache
,
902 int regnum
, int *optimizedp
,
903 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
904 int *realnump
, gdb_byte
*bufferp
)
906 struct trad_frame_cache
*cache
=
907 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
909 trad_frame_get_register (cache
, next_frame
, regnum
, optimizedp
,
910 lvalp
, addrp
, realnump
, bufferp
);
912 trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum,
913 optimizedp, lvalp, addrp, realnump, bufferp);
917 static const struct frame_unwind mn10300_frame_unwind
= {
919 mn10300_frame_this_id
,
920 mn10300_frame_prev_register
924 mn10300_frame_base_address (struct frame_info
*next_frame
,
925 void **this_prologue_cache
)
927 struct trad_frame_cache
*cache
=
928 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
930 return trad_frame_get_this_base (cache
);
933 static const struct frame_unwind
*
934 mn10300_frame_sniffer (struct frame_info
*next_frame
)
936 return &mn10300_frame_unwind
;
939 static const struct frame_base mn10300_frame_base
= {
940 &mn10300_frame_unwind
,
941 mn10300_frame_base_address
,
942 mn10300_frame_base_address
,
943 mn10300_frame_base_address
947 mn10300_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
951 pc
= frame_unwind_register_unsigned (next_frame
, E_PC_REGNUM
);
956 mn10300_unwind_sp (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
960 sp
= frame_unwind_register_unsigned (next_frame
, E_SP_REGNUM
);
965 mn10300_frame_unwind_init (struct gdbarch
*gdbarch
)
967 frame_unwind_append_sniffer (gdbarch
, dwarf2_frame_sniffer
);
968 frame_unwind_append_sniffer (gdbarch
, mn10300_frame_sniffer
);
969 frame_base_set_default (gdbarch
, &mn10300_frame_base
);
970 set_gdbarch_unwind_dummy_id (gdbarch
, mn10300_unwind_dummy_id
);
971 set_gdbarch_unwind_pc (gdbarch
, mn10300_unwind_pc
);
972 set_gdbarch_unwind_sp (gdbarch
, mn10300_unwind_sp
);
975 /* Function: push_dummy_call
977 * Set up machine state for a target call, including
978 * function arguments, stack, return address, etc.
983 mn10300_push_dummy_call (struct gdbarch
*gdbarch
,
984 struct value
*target_func
,
985 struct regcache
*regcache
,
987 int nargs
, struct value
**args
,
990 CORE_ADDR struct_addr
)
992 const int push_size
= register_size (gdbarch
, E_PC_REGNUM
);
995 int stack_offset
= 0;
997 char *val
, valbuf
[MAX_REGISTER_SIZE
];
999 /* This should be a nop, but align the stack just in case something
1000 went wrong. Stacks are four byte aligned on the mn10300. */
1003 /* Now make space on the stack for the args.
1005 XXX This doesn't appear to handle pass-by-invisible reference
1007 regs_used
= struct_return
? 1 : 0;
1008 for (len
= 0, argnum
= 0; argnum
< nargs
; argnum
++)
1010 arg_len
= (TYPE_LENGTH (value_type (args
[argnum
])) + 3) & ~3;
1011 while (regs_used
< 2 && arg_len
> 0)
1014 arg_len
-= push_size
;
1019 /* Allocate stack space. */
1025 regcache_cooked_write_unsigned (regcache
, E_D0_REGNUM
, struct_addr
);
1030 /* Push all arguments onto the stack. */
1031 for (argnum
= 0; argnum
< nargs
; argnum
++)
1033 /* FIXME what about structs? Unions? */
1034 if (TYPE_CODE (value_type (*args
)) == TYPE_CODE_STRUCT
1035 && TYPE_LENGTH (value_type (*args
)) > 8)
1037 /* Change to pointer-to-type. */
1038 arg_len
= push_size
;
1039 store_unsigned_integer (valbuf
, push_size
,
1040 VALUE_ADDRESS (*args
));
1045 arg_len
= TYPE_LENGTH (value_type (*args
));
1046 val
= (char *) value_contents (*args
);
1049 while (regs_used
< 2 && arg_len
> 0)
1051 regcache_cooked_write_unsigned (regcache
, regs_used
,
1052 extract_unsigned_integer (val
, push_size
));
1054 arg_len
-= push_size
;
1060 write_memory (sp
+ stack_offset
, val
, push_size
);
1061 arg_len
-= push_size
;
1063 stack_offset
+= push_size
;
1069 /* Make space for the flushback area. */
1072 /* Push the return address that contains the magic breakpoint. */
1074 write_memory_unsigned_integer (sp
, push_size
, bp_addr
);
1076 /* The CPU also writes the return address always into the
1077 MDR register on "call". */
1078 regcache_cooked_write_unsigned (regcache
, E_MDR_REGNUM
, bp_addr
);
1081 regcache_cooked_write_unsigned (regcache
, E_SP_REGNUM
, sp
);
1085 /* If DWARF2 is a register number appearing in Dwarf2 debug info, then
1086 mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
1087 register number. Why don't Dwarf2 and GDB use the same numbering?
1088 Who knows? But since people have object files lying around with
1089 the existing Dwarf2 numbering, and other people have written stubs
1090 to work with the existing GDB, neither of them can change. So we
1091 just have to cope. */
1093 mn10300_dwarf2_reg_to_regnum (struct gdbarch
*gdbarch
, int dwarf2
)
1095 /* This table is supposed to be shaped like the gdbarch_register_name
1096 initializer in gcc/config/mn10300/mn10300.h. Registers which
1097 appear in GCC's numbering, but have no counterpart in GDB's
1098 world, are marked with a -1. */
1099 static int dwarf2_to_gdb
[] = {
1100 0, 1, 2, 3, 4, 5, 6, 7, -1, 8,
1101 15, 16, 17, 18, 19, 20, 21, 22,
1102 32, 33, 34, 35, 36, 37, 38, 39,
1103 40, 41, 42, 43, 44, 45, 46, 47,
1104 48, 49, 50, 51, 52, 53, 54, 55,
1105 56, 57, 58, 59, 60, 61, 62, 63,
1110 || dwarf2
>= ARRAY_SIZE (dwarf2_to_gdb
))
1112 warning (_("Bogus register number in debug info: %d"), dwarf2
);
1116 return dwarf2_to_gdb
[dwarf2
];
1119 static struct gdbarch
*
1120 mn10300_gdbarch_init (struct gdbarch_info info
,
1121 struct gdbarch_list
*arches
)
1123 struct gdbarch
*gdbarch
;
1124 struct gdbarch_tdep
*tdep
;
1127 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
1129 return arches
->gdbarch
;
1131 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
1132 gdbarch
= gdbarch_alloc (&info
, tdep
);
1134 switch (info
.bfd_arch_info
->mach
)
1137 case bfd_mach_mn10300
:
1138 set_gdbarch_register_name (gdbarch
, mn10300_generic_register_name
);
1139 tdep
->am33_mode
= 0;
1143 set_gdbarch_register_name (gdbarch
, am33_register_name
);
1144 tdep
->am33_mode
= 1;
1147 case bfd_mach_am33_2
:
1148 set_gdbarch_register_name (gdbarch
, am33_2_register_name
);
1149 tdep
->am33_mode
= 2;
1151 set_gdbarch_fp0_regnum (gdbarch
, 32);
1154 internal_error (__FILE__
, __LINE__
,
1155 _("mn10300_gdbarch_init: Unknown mn10300 variant"));
1160 set_gdbarch_num_regs (gdbarch
, num_regs
);
1161 set_gdbarch_register_type (gdbarch
, mn10300_register_type
);
1162 set_gdbarch_skip_prologue (gdbarch
, mn10300_skip_prologue
);
1163 set_gdbarch_read_pc (gdbarch
, mn10300_read_pc
);
1164 set_gdbarch_write_pc (gdbarch
, mn10300_write_pc
);
1165 set_gdbarch_pc_regnum (gdbarch
, E_PC_REGNUM
);
1166 set_gdbarch_sp_regnum (gdbarch
, E_SP_REGNUM
);
1167 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, mn10300_dwarf2_reg_to_regnum
);
1169 /* Stack unwinding. */
1170 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1172 set_gdbarch_breakpoint_from_pc (gdbarch
, mn10300_breakpoint_from_pc
);
1173 /* decr_pc_after_break? */
1175 set_gdbarch_print_insn (gdbarch
, print_insn_mn10300
);
1178 set_gdbarch_return_value (gdbarch
, mn10300_return_value
);
1180 /* Stage 3 -- get target calls working. */
1181 set_gdbarch_push_dummy_call (gdbarch
, mn10300_push_dummy_call
);
1182 /* set_gdbarch_return_value (store, extract) */
1185 mn10300_frame_unwind_init (gdbarch
);
1187 /* Hook in ABI-specific overrides, if they have been registered. */
1188 gdbarch_init_osabi (info
, gdbarch
);
1193 /* Dump out the mn10300 specific architecture information. */
1196 mn10300_dump_tdep (struct gdbarch
*gdbarch
, struct ui_file
*file
)
1198 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1199 fprintf_unfiltered (file
, "mn10300_dump_tdep: am33_mode = %d\n",
1204 _initialize_mn10300_tdep (void)
1206 gdbarch_register (bfd_arch_mn10300
, mn10300_gdbarch_init
, mn10300_dump_tdep
);