1 /* Target-machine dependent code for Motorola MCore for GDB, the GNU debugger
2 Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
29 #include "arch-utils.h"
30 #include "gdb_string.h"
34 static CORE_ADDR
mcore_analyze_prologue (struct frame_info
*fi
, CORE_ADDR pc
,
36 static int get_insn (CORE_ADDR pc
);
43 /* All registers are 4 bytes long. */
44 #define MCORE_REG_SIZE 4
45 #define MCORE_NUM_REGS 65
47 /* Some useful register numbers. */
49 #define FIRST_ARGREG 2
51 #define RETVAL_REGNUM 2
54 /* Additional info that we use for managing frames */
55 struct frame_extra_info
57 /* A generic status word */
60 /* Size of this frame */
63 /* The register that is acting as a frame pointer, if
64 it is being used. This is undefined if status
65 does not contain the flag MY_FRAME_IN_FP. */
69 /* frame_extra_info status flags */
71 /* The base of the current frame is actually in the stack pointer.
72 This happens when there is no frame pointer (MCore ABI does not
73 require a frame pointer) or when we're stopped in the prologue or
74 epilogue itself. In these cases, mcore_analyze_prologue will need
75 to update fi->frame before returning or analyzing the register
77 #define MY_FRAME_IN_SP 0x1
79 /* The base of the current frame is in a frame pointer register.
80 This register is noted in frame_extra_info->fp_regnum.
82 Note that the existence of an FP might also indicate that the
83 function has called alloca. */
84 #define MY_FRAME_IN_FP 0x2
86 /* This flag is set to indicate that this frame is the top-most
87 frame. This tells frame chain not to bother trying to unwind
89 #define NO_MORE_FRAMES 0x4
91 /* Instruction macros used for analyzing the prologue */
92 #define IS_SUBI0(x) (((x) & 0xfe0f) == 0x2400) /* subi r0,oimm5 */
93 #define IS_STM(x) (((x) & 0xfff0) == 0x0070) /* stm rf-r15,r0 */
94 #define IS_STWx0(x) (((x) & 0xf00f) == 0x9000) /* stw rz,(r0,disp) */
95 #define IS_STWxy(x) (((x) & 0xf000) == 0x9000) /* stw rx,(ry,disp) */
96 #define IS_MOVx0(x) (((x) & 0xfff0) == 0x1200) /* mov rn,r0 */
97 #define IS_LRW1(x) (((x) & 0xff00) == 0x7100) /* lrw r1,literal */
98 #define IS_MOVI1(x) (((x) & 0xf80f) == 0x6001) /* movi r1,imm7 */
99 #define IS_BGENI1(x) (((x) & 0xfe0f) == 0x3201) /* bgeni r1,imm5 */
100 #define IS_BMASKI1(x) (((x) & 0xfe0f) == 0x2C01) /* bmaski r1,imm5 */
101 #define IS_ADDI1(x) (((x) & 0xfe0f) == 0x2001) /* addi r1,oimm5 */
102 #define IS_SUBI1(x) (((x) & 0xfe0f) == 0x2401) /* subi r1,oimm5 */
103 #define IS_RSUBI1(x) (((x) & 0xfe0f) == 0x2801) /* rsubi r1,imm5 */
104 #define IS_NOT1(x) (((x) & 0xffff) == 0x01f1) /* not r1 */
105 #define IS_ROTLI1(x) (((x) & 0xfe0f) == 0x3801) /* rotli r1,imm5 */
106 #define IS_BSETI1(x) (((x) & 0xfe0f) == 0x3401) /* bseti r1,imm5 */
107 #define IS_BCLRI1(x) (((x) & 0xfe0f) == 0x3001) /* bclri r1,imm5 */
108 #define IS_IXH1(x) (((x) & 0xffff) == 0x1d11) /* ixh r1,r1 */
109 #define IS_IXW1(x) (((x) & 0xffff) == 0x1511) /* ixw r1,r1 */
110 #define IS_SUB01(x) (((x) & 0xffff) == 0x0510) /* subu r0,r1 */
111 #define IS_RTS(x) (((x) & 0xffff) == 0x00cf) /* jmp r15 */
113 #define IS_R1_ADJUSTER(x) \
114 (IS_ADDI1(x) || IS_SUBI1(x) || IS_ROTLI1(x) || IS_BSETI1(x) \
115 || IS_BCLRI1(x) || IS_RSUBI1(x) || IS_NOT1(x) \
116 || IS_IXH1(x) || IS_IXW1(x))
121 mcore_dump_insn (char *commnt
, CORE_ADDR pc
, int insn
)
125 printf_filtered ("MCORE: %s %08x %08x ",
126 commnt
, (unsigned int) pc
, (unsigned int) insn
);
127 gdb_print_insn (pc
, gdb_stdout
);
128 printf_filtered ("\n");
131 #define mcore_insn_debug(args) { if (mcore_debug) printf_filtered args; }
132 #else /* !MCORE_DEBUG */
133 #define mcore_dump_insn(a,b,c) {}
134 #define mcore_insn_debug(args) {}
139 mcore_register_virtual_type (int regnum
)
141 if (regnum
< 0 || regnum
>= MCORE_NUM_REGS
)
142 internal_error (__FILE__
, __LINE__
,
143 "mcore_register_virtual_type: illegal register number %d",
146 return builtin_type_int
;
150 mcore_register_byte (int regnum
)
152 if (regnum
< 0 || regnum
>= MCORE_NUM_REGS
)
153 internal_error (__FILE__
, __LINE__
,
154 "mcore_register_byte: illegal register number %d",
157 return (regnum
* MCORE_REG_SIZE
);
161 mcore_register_size (int regnum
)
164 if (regnum
< 0 || regnum
>= MCORE_NUM_REGS
)
165 internal_error (__FILE__
, __LINE__
,
166 "mcore_register_size: illegal register number %d",
169 return MCORE_REG_SIZE
;
172 /* The registers of the Motorola MCore processors */
175 mcore_register_name (int regnum
)
178 static char *register_names
[] = {
179 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
180 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
181 "ar0", "ar1", "ar2", "ar3", "ar4", "ar5", "ar6", "ar7",
182 "ar8", "ar9", "ar10", "ar11", "ar12", "ar13", "ar14", "ar15",
183 "psr", "vbr", "epsr", "fpsr", "epc", "fpc", "ss0", "ss1",
184 "ss2", "ss3", "ss4", "gcr", "gsr", "cr13", "cr14", "cr15",
185 "cr16", "cr17", "cr18", "cr19", "cr20", "cr21", "cr22", "cr23",
186 "cr24", "cr25", "cr26", "cr27", "cr28", "cr29", "cr30", "cr31",
191 regnum
>= sizeof (register_names
) / sizeof (register_names
[0]))
192 internal_error (__FILE__
, __LINE__
,
193 "mcore_register_name: illegal register number %d",
196 return register_names
[regnum
];
199 /* Given the address at which to insert a breakpoint (BP_ADDR),
200 what will that breakpoint be?
202 For MCore, we have a breakpoint instruction. Since all MCore
203 instructions are 16 bits, this is all we need, regardless of
204 address. bpkt = 0x0000 */
206 static const unsigned char *
207 mcore_breakpoint_from_pc (CORE_ADDR
* bp_addr
, int *bp_size
)
209 static char breakpoint
[] =
216 mcore_saved_pc_after_call (struct frame_info
*frame
)
218 return read_register (PR_REGNUM
);
221 /* This is currently handled by init_extra_frame_info. */
223 mcore_frame_init_saved_regs (struct frame_info
*frame
)
228 /* This is currently handled by mcore_push_arguments */
230 mcore_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
236 mcore_reg_struct_has_addr (int gcc_p
, struct type
*type
)
242 /* Helper function for several routines below. This funtion simply
243 sets up a fake, aka dummy, frame (not a _call_ dummy frame) that
244 we can analyze with mcore_analyze_prologue. */
246 static struct frame_info
*
247 analyze_dummy_frame (CORE_ADDR pc
, CORE_ADDR frame
)
249 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
250 struct frame_info
*dummy
251 = deprecated_frame_xmalloc_with_cleanup (SIZEOF_FRAME_SAVED_REGS
,
252 sizeof (struct frame_extra_info
));
253 deprecated_update_frame_pc_hack (dummy
, pc
);
254 deprecated_update_frame_base_hack (dummy
, frame
);
255 get_frame_extra_info (dummy
)->status
= 0;
256 get_frame_extra_info (dummy
)->framesize
= 0;
257 mcore_analyze_prologue (dummy
, 0, 0);
258 do_cleanups (old_chain
);
262 /* Function prologues on the Motorola MCore processors consist of:
264 - adjustments to the stack pointer (r1 used as scratch register)
265 - store word/multiples that use r0 as the base address
266 - making a copy of r0 into another register (a "frame" pointer)
268 Note that the MCore really doesn't have a real frame pointer.
269 Instead, the compiler may copy the SP into a register (usually
270 r8) to act as an arg pointer. For our target-dependent purposes,
271 the frame info's "frame" member will be the beginning of the
272 frame. The SP could, in fact, point below this.
274 The prologue ends when an instruction fails to meet either of
275 the first two criteria or when an FP is made. We make a special
276 exception for gcc. When compiling unoptimized code, gcc will
277 setup stack slots. We need to make sure that we skip the filling
278 of these stack slots as much as possible. This is only done
279 when SKIP_PROLOGUE is set, so that it does not mess up
282 /* Analyze the prologue of frame FI to determine where registers are saved,
283 the end of the prologue, etc. Return the address of the first line
284 of "real" code (i.e., the end of the prologue). */
287 mcore_analyze_prologue (struct frame_info
*fi
, CORE_ADDR pc
, int skip_prologue
)
289 CORE_ADDR func_addr
, func_end
, addr
, stop
;
290 CORE_ADDR stack_size
;
293 int fp_regnum
= 0; /* dummy, valid when (flags & MY_FRAME_IN_FP) */
296 int register_offsets
[NUM_REGS
];
299 /* If provided, use the PC in the frame to look up the
300 start of this function. */
301 pc
= (fi
== NULL
? pc
: get_frame_pc (fi
));
303 /* Find the start of this function. */
304 status
= find_pc_partial_function (pc
, &name
, &func_addr
, &func_end
);
306 /* If the start of this function could not be found or if the debbuger
307 is stopped at the first instruction of the prologue, do nothing. */
311 /* If the debugger is entry function, give up. */
312 if (func_addr
== entry_point_address ())
315 get_frame_extra_info (fi
)->status
|= NO_MORE_FRAMES
;
319 /* At the start of a function, our frame is in the stack pointer. */
320 flags
= MY_FRAME_IN_SP
;
322 /* Start decoding the prologue. We start by checking two special cases:
324 1. We're about to return
325 2. We're at the first insn of the prologue.
327 If we're about to return, our frame has already been deallocated.
328 If we are stopped at the first instruction of a prologue,
329 then our frame has not yet been set up. */
331 /* Get the first insn from memory (all MCore instructions are 16 bits) */
332 mcore_insn_debug (("MCORE: starting prologue decoding\n"));
333 insn
= get_insn (pc
);
334 mcore_dump_insn ("got 1: ", pc
, insn
);
336 /* Check for return. */
337 if (fi
!= NULL
&& IS_RTS (insn
))
339 mcore_insn_debug (("MCORE: got jmp r15"));
340 if (get_next_frame (fi
) == NULL
)
341 deprecated_update_frame_base_hack (fi
, read_sp ());
342 return get_frame_pc (fi
);
345 /* Check for first insn of prologue */
346 if (fi
!= NULL
&& get_frame_pc (fi
) == func_addr
)
348 if (get_next_frame (fi
) == NULL
)
349 deprecated_update_frame_base_hack (fi
, read_sp ());
350 return get_frame_pc (fi
);
353 /* Figure out where to stop scanning */
354 stop
= (fi
? get_frame_pc (fi
) : func_end
);
356 /* Don't walk off the end of the function */
357 stop
= (stop
> func_end
? func_end
: stop
);
359 /* REGISTER_OFFSETS will contain offsets, from the top of the frame
360 (NOT the frame pointer), for the various saved registers or -1
361 if the register is not saved. */
362 for (rn
= 0; rn
< NUM_REGS
; rn
++)
363 register_offsets
[rn
] = -1;
365 /* Analyze the prologue. Things we determine from analyzing the
367 * the size of the frame
368 * where saved registers are located (and which are saved)
370 mcore_insn_debug (("MCORE: Scanning prologue: func_addr=0x%x, stop=0x%x\n",
371 (unsigned int) func_addr
, (unsigned int) stop
));
374 for (addr
= func_addr
; addr
< stop
; addr
+= 2)
377 insn
= get_insn (addr
);
378 mcore_dump_insn ("got 2: ", addr
, insn
);
382 int offset
= 1 + ((insn
>> 4) & 0x1f);
383 mcore_insn_debug (("MCORE: got subi r0,%d; continuing\n", offset
));
387 else if (IS_STM (insn
))
389 /* Spill register(s) */
393 /* BIG WARNING! The MCore ABI does not restrict functions
394 to taking only one stack allocation. Therefore, when
395 we save a register, we record the offset of where it was
396 saved relative to the current framesize. This will
397 then give an offset from the SP upon entry to our
398 function. Remember, framesize is NOT constant until
399 we're done scanning the prologue. */
400 start_register
= (insn
& 0xf);
401 mcore_insn_debug (("MCORE: got stm r%d-r15,(r0)\n", start_register
));
403 for (rn
= start_register
, offset
= 0; rn
<= 15; rn
++, offset
+= 4)
405 register_offsets
[rn
] = framesize
- offset
;
406 mcore_insn_debug (("MCORE: r%d saved at 0x%x (offset %d)\n", rn
,
407 register_offsets
[rn
], offset
));
409 mcore_insn_debug (("MCORE: continuing\n"));
412 else if (IS_STWx0 (insn
))
414 /* Spill register: see note for IS_STM above. */
417 rn
= (insn
>> 8) & 0xf;
418 imm
= (insn
>> 4) & 0xf;
419 register_offsets
[rn
] = framesize
- (imm
<< 2);
420 mcore_insn_debug (("MCORE: r%d saved at offset 0x%x\n", rn
, register_offsets
[rn
]));
421 mcore_insn_debug (("MCORE: continuing\n"));
424 else if (IS_MOVx0 (insn
))
426 /* We have a frame pointer, so this prologue is over. Note
427 the register which is acting as the frame pointer. */
428 flags
|= MY_FRAME_IN_FP
;
429 flags
&= ~MY_FRAME_IN_SP
;
430 fp_regnum
= insn
& 0xf;
431 mcore_insn_debug (("MCORE: Found a frame pointer: r%d\n", fp_regnum
));
433 /* If we found an FP, we're at the end of the prologue. */
434 mcore_insn_debug (("MCORE: end of prologue\n"));
438 /* If we're decoding prologue, stop here. */
442 else if (IS_STWxy (insn
) && (flags
& MY_FRAME_IN_FP
) && ((insn
& 0xf) == fp_regnum
))
444 /* Special case. Skip over stack slot allocs, too. */
445 mcore_insn_debug (("MCORE: push arg onto stack.\n"));
448 else if (IS_LRW1 (insn
) || IS_MOVI1 (insn
)
449 || IS_BGENI1 (insn
) || IS_BMASKI1 (insn
))
455 mcore_insn_debug (("MCORE: looking at large frame\n"));
459 read_memory_integer ((addr
+ 2 + ((insn
& 0xff) << 2)) & 0xfffffffc, 4);
461 else if (IS_MOVI1 (insn
))
462 adjust
= (insn
>> 4) & 0x7f;
463 else if (IS_BGENI1 (insn
))
464 adjust
= 1 << ((insn
>> 4) & 0x1f);
465 else /* IS_BMASKI (insn) */
466 adjust
= (1 << (adjust
>> 4) & 0x1f) - 1;
468 mcore_insn_debug (("MCORE: base framesize=0x%x\n", adjust
));
470 /* May have zero or more insns which modify r1 */
471 mcore_insn_debug (("MCORE: looking for r1 adjusters...\n"));
473 insn2
= get_insn (addr
+ offset
);
474 while (IS_R1_ADJUSTER (insn2
))
478 imm
= (insn2
>> 4) & 0x1f;
479 mcore_dump_insn ("got 3: ", addr
+ offset
, insn
);
480 if (IS_ADDI1 (insn2
))
483 mcore_insn_debug (("MCORE: addi r1,%d\n", imm
+ 1));
485 else if (IS_SUBI1 (insn2
))
488 mcore_insn_debug (("MCORE: subi r1,%d\n", imm
+ 1));
490 else if (IS_RSUBI1 (insn2
))
492 adjust
= imm
- adjust
;
493 mcore_insn_debug (("MCORE: rsubi r1,%d\n", imm
+ 1));
495 else if (IS_NOT1 (insn2
))
498 mcore_insn_debug (("MCORE: not r1\n"));
500 else if (IS_ROTLI1 (insn2
))
503 mcore_insn_debug (("MCORE: rotli r1,%d\n", imm
+ 1));
505 else if (IS_BSETI1 (insn2
))
507 adjust
|= (1 << imm
);
508 mcore_insn_debug (("MCORE: bseti r1,%d\n", imm
));
510 else if (IS_BCLRI1 (insn2
))
512 adjust
&= ~(1 << imm
);
513 mcore_insn_debug (("MCORE: bclri r1,%d\n", imm
));
515 else if (IS_IXH1 (insn2
))
518 mcore_insn_debug (("MCORE: ix.h r1,r1\n"));
520 else if (IS_IXW1 (insn2
))
523 mcore_insn_debug (("MCORE: ix.w r1,r1\n"));
527 insn2
= get_insn (addr
+ offset
);
530 mcore_insn_debug (("MCORE: done looking for r1 adjusters\n"));
532 /* If the next insn adjusts the stack pointer, we keep everything;
533 if not, we scrap it and we've found the end of the prologue. */
534 if (IS_SUB01 (insn2
))
538 mcore_insn_debug (("MCORE: found stack adjustment of 0x%x bytes.\n", adjust
));
539 mcore_insn_debug (("MCORE: skipping to new address 0x%x\n", addr
));
540 mcore_insn_debug (("MCORE: continuing\n"));
544 /* None of these instructions are prologue, so don't touch
546 mcore_insn_debug (("MCORE: no subu r1,r0, NOT altering framesize.\n"));
550 /* This is not a prologue insn, so stop here. */
551 mcore_insn_debug (("MCORE: insn is not a prologue insn -- ending scan\n"));
555 mcore_insn_debug (("MCORE: done analyzing prologue\n"));
556 mcore_insn_debug (("MCORE: prologue end = 0x%x\n", addr
));
558 /* Save everything we have learned about this frame into FI. */
561 get_frame_extra_info (fi
)->framesize
= framesize
;
562 get_frame_extra_info (fi
)->fp_regnum
= fp_regnum
;
563 get_frame_extra_info (fi
)->status
= flags
;
565 /* Fix the frame pointer. When gcc uses r8 as a frame pointer,
566 it is really an arg ptr. We adjust fi->frame to be a "real"
568 if (get_next_frame (fi
) == NULL
)
570 if (get_frame_extra_info (fi
)->status
& MY_FRAME_IN_SP
)
571 deprecated_update_frame_base_hack (fi
, read_sp () + framesize
);
573 deprecated_update_frame_base_hack (fi
, read_register (fp_regnum
) + framesize
);
576 /* Note where saved registers are stored. The offsets in REGISTER_OFFSETS
577 are computed relative to the top of the frame. */
578 for (rn
= 0; rn
< NUM_REGS
; rn
++)
580 if (register_offsets
[rn
] >= 0)
582 deprecated_get_frame_saved_regs (fi
)[rn
] = get_frame_base (fi
) - register_offsets
[rn
];
583 mcore_insn_debug (("Saved register %s stored at 0x%08x, value=0x%08x\n",
584 mcore_register_names
[rn
], fi
->saved_regs
[rn
],
585 read_memory_integer (fi
->saved_regs
[rn
], 4)));
590 /* Return addr of first non-prologue insn. */
594 /* Given a GDB frame, determine the address of the calling function's
595 frame. This will be used to create a new GDB frame struct, and
596 then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC
597 will be called for the new frame. */
600 mcore_frame_chain (struct frame_info
* fi
)
602 struct frame_info
*dummy
;
603 CORE_ADDR callers_addr
;
605 /* Analyze the prologue of this function. */
606 if (get_frame_extra_info (fi
)->status
== 0)
607 mcore_analyze_prologue (fi
, 0, 0);
609 /* If mcore_analyze_prologue set NO_MORE_FRAMES, quit now. */
610 if (get_frame_extra_info (fi
)->status
& NO_MORE_FRAMES
)
613 /* Now that we've analyzed our prologue, we can start to ask
614 for information about our caller. The easiest way to do
615 this is to analyze our caller's prologue.
617 If our caller has a frame pointer, then we need to find
618 the value of that register upon entry to our frame.
619 This value is either in fi->saved_regs[rn] if it's saved,
620 or it's still in a register.
622 If our caller does not have a frame pointer, then his frame base
623 is <our base> + -<caller's frame size>. */
624 dummy
= analyze_dummy_frame (DEPRECATED_FRAME_SAVED_PC (fi
), get_frame_base (fi
));
626 if (get_frame_extra_info (dummy
)->status
& MY_FRAME_IN_FP
)
628 int fp
= get_frame_extra_info (dummy
)->fp_regnum
;
630 /* Our caller has a frame pointer. */
631 if (deprecated_get_frame_saved_regs (fi
)[fp
] != 0)
633 /* The "FP" was saved on the stack. Don't forget to adjust
634 the "FP" with the framesize to get a real FP. */
635 callers_addr
= read_memory_integer (deprecated_get_frame_saved_regs (fi
)[fp
],
636 DEPRECATED_REGISTER_SIZE
)
637 + get_frame_extra_info (dummy
)->framesize
;
641 /* It's still in the register. Don't forget to adjust
642 the "FP" with the framesize to get a real FP. */
643 callers_addr
= read_register (fp
) + get_frame_extra_info (dummy
)->framesize
;
648 /* Our caller does not have a frame pointer. */
649 callers_addr
= get_frame_base (fi
) + get_frame_extra_info (dummy
)->framesize
;
655 /* Skip the prologue of the function at PC. */
658 mcore_skip_prologue (CORE_ADDR pc
)
660 CORE_ADDR func_addr
, func_end
;
661 struct symtab_and_line sal
;
663 /* If we have line debugging information, then the end of the
664 prologue should be the first assembly instruction of the first
666 if (find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
668 sal
= find_pc_line (func_addr
, 0);
669 if (sal
.end
&& sal
.end
< func_end
)
673 return mcore_analyze_prologue (NULL
, pc
, 1);
676 /* Return the address at which function arguments are offset. */
678 mcore_frame_args_address (struct frame_info
* fi
)
680 return get_frame_base (fi
) - get_frame_extra_info (fi
)->framesize
;
684 mcore_frame_locals_address (struct frame_info
* fi
)
686 return get_frame_base (fi
) - get_frame_extra_info (fi
)->framesize
;
689 /* Return the frame pointer in use at address PC. */
692 mcore_virtual_frame_pointer (CORE_ADDR pc
, int *reg
, LONGEST
*offset
)
694 struct frame_info
*dummy
= analyze_dummy_frame (pc
, 0);
695 if (get_frame_extra_info (dummy
)->status
& MY_FRAME_IN_SP
)
702 *reg
= get_frame_extra_info (dummy
)->fp_regnum
;
707 /* Find the value of register REGNUM in frame FI. */
710 mcore_find_callers_reg (struct frame_info
*fi
, int regnum
)
712 for (; fi
!= NULL
; fi
= get_next_frame (fi
))
714 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi
), get_frame_base (fi
),
715 get_frame_base (fi
)))
716 return deprecated_read_register_dummy (get_frame_pc (fi
),
717 get_frame_base (fi
), regnum
);
718 else if (deprecated_get_frame_saved_regs (fi
)[regnum
] != 0)
719 return read_memory_integer (deprecated_get_frame_saved_regs (fi
)[regnum
],
720 DEPRECATED_REGISTER_SIZE
);
723 return read_register (regnum
);
726 /* Find the saved pc in frame FI. */
729 mcore_frame_saved_pc (struct frame_info
* fi
)
732 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi
), get_frame_base (fi
),
733 get_frame_base (fi
)))
734 return deprecated_read_register_dummy (get_frame_pc (fi
),
735 get_frame_base (fi
), PC_REGNUM
);
737 return mcore_find_callers_reg (fi
, PR_REGNUM
);
740 /* INFERIOR FUNCTION CALLS */
742 /* This routine gets called when either the user uses the "return"
743 command, or the call dummy breakpoint gets hit. */
746 mcore_pop_frame (void)
749 struct frame_info
*fi
= get_current_frame ();
751 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi
), get_frame_base (fi
),
752 get_frame_base (fi
)))
753 generic_pop_dummy_frame ();
756 /* Write out the PC we saved. */
757 write_register (PC_REGNUM
, DEPRECATED_FRAME_SAVED_PC (fi
));
759 /* Restore any saved registers. */
760 for (rn
= 0; rn
< NUM_REGS
; rn
++)
762 if (deprecated_get_frame_saved_regs (fi
)[rn
] != 0)
766 value
= read_memory_unsigned_integer (deprecated_get_frame_saved_regs (fi
)[rn
],
767 DEPRECATED_REGISTER_SIZE
);
768 write_register (rn
, value
);
772 /* Actually cut back the stack. */
773 write_register (SP_REGNUM
, get_frame_base (fi
));
776 /* Finally, throw away any cached frame information. */
777 flush_cached_frames ();
780 /* Setup arguments and PR for a call to the target. First six arguments
781 go in FIRST_ARGREG -> LAST_ARGREG, subsequent args go on to the stack.
783 - Types with lengths greater than DEPRECATED_REGISTER_SIZE may not
784 be split between registers and the stack, and they must start in an
785 even-numbered register. Subsequent args will go onto the stack.
787 * Structs may be split between registers and stack, left-aligned.
789 * If the function returns a struct which will not fit into registers (it's
790 more than eight bytes), we must allocate for that, too. Gdb will tell
791 us where this buffer is (STRUCT_ADDR), and we simply place it into
792 FIRST_ARGREG, since the MCORE treats struct returns (of less than eight
793 bytes) as hidden first arguments. */
796 mcore_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
797 int struct_return
, CORE_ADDR struct_addr
)
809 stack_args
= (struct stack_arg
*) alloca (nargs
* sizeof (struct stack_arg
));
811 argreg
= FIRST_ARGREG
;
813 /* Align the stack. This is mostly a nop, but not always. It will be needed
814 if we call a function which has argument overflow. */
817 /* If this function returns a struct which does not fit in the
818 return registers, we must pass a buffer to the function
819 which it can use to save the return value. */
821 write_register (argreg
++, struct_addr
);
823 /* FIXME: what about unions? */
824 for (argnum
= 0; argnum
< nargs
; argnum
++)
826 char *val
= (char *) VALUE_CONTENTS (args
[argnum
]);
827 int len
= TYPE_LENGTH (VALUE_TYPE (args
[argnum
]));
828 struct type
*type
= VALUE_TYPE (args
[argnum
]);
831 mcore_insn_debug (("MCORE PUSH: argreg=%d; len=%d; %s\n",
832 argreg
, len
, TYPE_CODE (type
) == TYPE_CODE_STRUCT
? "struct" : "not struct"));
833 /* Arguments larger than a register must start in an even
834 numbered register. */
837 if (TYPE_CODE (type
) != TYPE_CODE_STRUCT
&& len
> DEPRECATED_REGISTER_SIZE
&& argreg
% 2)
839 mcore_insn_debug (("MCORE PUSH: %d > DEPRECATED_REGISTER_SIZE: and %s is not even\n",
840 len
, mcore_register_names
[argreg
]));
844 if ((argreg
<= LAST_ARGREG
&& len
<= (LAST_ARGREG
- argreg
+ 1) * DEPRECATED_REGISTER_SIZE
)
845 || (TYPE_CODE (type
) == TYPE_CODE_STRUCT
))
847 /* Something that will fit entirely into registers (or a struct
848 which may be split between registers and stack). */
849 mcore_insn_debug (("MCORE PUSH: arg %d going into regs\n", argnum
));
851 if (TYPE_CODE (type
) == TYPE_CODE_STRUCT
&& olen
< DEPRECATED_REGISTER_SIZE
)
853 /* Small structs must be right aligned within the register,
854 the most significant bits are undefined. */
855 write_register (argreg
, extract_unsigned_integer (val
, len
));
860 while (len
> 0 && argreg
<= LAST_ARGREG
)
862 write_register (argreg
, extract_unsigned_integer (val
, DEPRECATED_REGISTER_SIZE
));
864 val
+= DEPRECATED_REGISTER_SIZE
;
865 len
-= DEPRECATED_REGISTER_SIZE
;
868 /* Any remainder for the stack is noted below... */
870 else if (TYPE_CODE (VALUE_TYPE (args
[argnum
])) != TYPE_CODE_STRUCT
871 && len
> DEPRECATED_REGISTER_SIZE
)
873 /* All subsequent args go onto the stack. */
874 mcore_insn_debug (("MCORE PUSH: does not fit into regs, going onto stack\n"));
875 argnum
= LAST_ARGREG
+ 1;
880 /* Note that this must be saved onto the stack */
881 mcore_insn_debug (("MCORE PUSH: adding arg %d to stack\n", argnum
));
882 stack_args
[nstack_args
].val
= val
;
883 stack_args
[nstack_args
].len
= len
;
889 /* We're done with registers and stack allocation. Now do the actual
891 while (nstack_args
--)
893 sp
-= stack_args
[nstack_args
].len
;
894 write_memory (sp
, stack_args
[nstack_args
].val
, stack_args
[nstack_args
].len
);
897 /* Return adjusted stack pointer. */
901 /* Store the return address for the call dummy. For MCore, we've opted
902 to use generic call dummies, so we simply store the entry-point
903 address into the PR register (r15). */
906 mcore_push_return_address (CORE_ADDR pc
, CORE_ADDR sp
)
908 write_register (PR_REGNUM
, entry_point_address ());
912 /* Setting/getting return values from functions.
914 The Motorola MCore processors use r2/r3 to return anything
915 not larger than 32 bits. Everything else goes into a caller-
916 supplied buffer, which is passed in via a hidden first
919 For gdb, this leaves us two routes, based on what
920 USE_STRUCT_CONVENTION (mcore_use_struct_convention) returns.
921 If this macro returns 1, gdb will call STORE_STRUCT_RETURN and
922 EXTRACT_STRUCT_VALUE_ADDRESS.
924 If USE_STRUCT_CONVENTION retruns 0, then gdb uses STORE_RETURN_VALUE
925 and EXTRACT_RETURN_VALUE to store/fetch the functions return value. */
927 /* Should we use EXTRACT_STRUCT_VALUE_ADDRESS instead of
928 EXTRACT_RETURN_VALUE? GCC_P is true if compiled with gcc
929 and TYPE is the type (which is known to be struct, union or array). */
932 mcore_use_struct_convention (int gcc_p
, struct type
*type
)
934 return (TYPE_LENGTH (type
) > 8);
937 /* Where is the return value saved? For MCore, a pointer to
938 this buffer was passed as a hidden first argument, so
939 just return that address. */
942 mcore_extract_struct_value_address (char *regbuf
)
944 return extract_unsigned_integer (regbuf
+ DEPRECATED_REGISTER_BYTE (FIRST_ARGREG
), DEPRECATED_REGISTER_SIZE
);
947 /* Given a function which returns a value of type TYPE, extract the
948 the function's return value and place the result into VALBUF.
949 REGBUF is the register contents of the target. */
952 mcore_extract_return_value (struct type
*type
, char *regbuf
, char *valbuf
)
954 /* Copy the return value (starting) in RETVAL_REGNUM to VALBUF. */
955 /* Only getting the first byte! if len = 1, we need the last byte of
956 the register, not the first. */
957 memcpy (valbuf
, regbuf
+ DEPRECATED_REGISTER_BYTE (RETVAL_REGNUM
) +
958 (TYPE_LENGTH (type
) < 4 ? 4 - TYPE_LENGTH (type
) : 0), TYPE_LENGTH (type
));
961 /* Store the return value in VALBUF (of type TYPE) where the caller
964 Values less than 32 bits are stored in r2, right justified and
965 sign or zero extended.
967 Values between 32 and 64 bits are stored in r2 (most
968 significant word) and r3 (least significant word, left justified).
969 Note that this includes structures of less than eight bytes, too. */
972 mcore_store_return_value (struct type
*type
, char *valbuf
)
979 value_size
= TYPE_LENGTH (type
);
981 /* Return value fits into registers. */
982 return_size
= (value_size
+ DEPRECATED_REGISTER_SIZE
- 1) & ~(DEPRECATED_REGISTER_SIZE
- 1);
983 offset
= DEPRECATED_REGISTER_BYTE (RETVAL_REGNUM
) + (return_size
- value_size
);
984 zeros
= alloca (return_size
);
985 memset (zeros
, 0, return_size
);
987 deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (RETVAL_REGNUM
), zeros
,
989 deprecated_write_register_bytes (offset
, valbuf
, value_size
);
992 /* Initialize our target-dependent "stuff" for this newly created frame.
994 This includes allocating space for saved registers and analyzing
995 the prologue of this frame. */
998 mcore_init_extra_frame_info (int fromleaf
, struct frame_info
*fi
)
1000 if (fi
&& get_next_frame (fi
))
1001 deprecated_update_frame_pc_hack (fi
, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi
)));
1003 frame_saved_regs_zalloc (fi
);
1005 frame_extra_info_zalloc (fi
, sizeof (struct frame_extra_info
));
1006 get_frame_extra_info (fi
)->status
= 0;
1007 get_frame_extra_info (fi
)->framesize
= 0;
1009 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi
), get_frame_base (fi
),
1010 get_frame_base (fi
)))
1012 /* We need to setup fi->frame here because call_function_by_hand
1013 gets it wrong by assuming it's always FP. */
1014 deprecated_update_frame_base_hack (fi
, deprecated_read_register_dummy (get_frame_pc (fi
), get_frame_base (fi
), SP_REGNUM
));
1017 mcore_analyze_prologue (fi
, 0, 0);
1020 /* Get an insturction from memory. */
1023 get_insn (CORE_ADDR pc
)
1026 int status
= read_memory_nobpt (pc
, buf
, 2);
1030 return extract_unsigned_integer (buf
, 2);
1033 static struct gdbarch
*
1034 mcore_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1036 static LONGEST call_dummy_words
[7] = { };
1037 struct gdbarch_tdep
*tdep
= NULL
;
1038 struct gdbarch
*gdbarch
;
1040 /* find a candidate among the list of pre-declared architectures. */
1041 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
1043 return (arches
->gdbarch
);
1045 gdbarch
= gdbarch_alloc (&info
, 0);
1047 /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
1048 ready to unwind the PC first (see frame.c:get_prev_frame()). */
1049 set_gdbarch_deprecated_init_frame_pc (gdbarch
, deprecated_init_frame_pc_default
);
1053 /* All registers are 32 bits */
1054 set_gdbarch_deprecated_register_size (gdbarch
, MCORE_REG_SIZE
);
1055 set_gdbarch_deprecated_max_register_raw_size (gdbarch
, MCORE_REG_SIZE
);
1056 set_gdbarch_deprecated_max_register_virtual_size (gdbarch
, MCORE_REG_SIZE
);
1057 set_gdbarch_register_name (gdbarch
, mcore_register_name
);
1058 set_gdbarch_deprecated_register_virtual_type (gdbarch
, mcore_register_virtual_type
);
1059 set_gdbarch_deprecated_register_virtual_size (gdbarch
, mcore_register_size
);
1060 set_gdbarch_deprecated_register_raw_size (gdbarch
, mcore_register_size
);
1061 set_gdbarch_deprecated_register_byte (gdbarch
, mcore_register_byte
);
1062 set_gdbarch_deprecated_register_bytes (gdbarch
, MCORE_REG_SIZE
* MCORE_NUM_REGS
);
1063 set_gdbarch_num_regs (gdbarch
, MCORE_NUM_REGS
);
1064 set_gdbarch_pc_regnum (gdbarch
, 64);
1065 set_gdbarch_sp_regnum (gdbarch
, 0);
1066 set_gdbarch_deprecated_fp_regnum (gdbarch
, 0);
1070 set_gdbarch_deprecated_call_dummy_words (gdbarch
, call_dummy_words
);
1071 set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch
, 0);
1072 set_gdbarch_deprecated_save_dummy_frame_tos (gdbarch
, generic_save_dummy_frame_tos
);
1073 set_gdbarch_deprecated_saved_pc_after_call (gdbarch
, mcore_saved_pc_after_call
);
1074 set_gdbarch_function_start_offset (gdbarch
, 0);
1075 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
1076 set_gdbarch_breakpoint_from_pc (gdbarch
, mcore_breakpoint_from_pc
);
1077 set_gdbarch_deprecated_push_return_address (gdbarch
, mcore_push_return_address
);
1078 set_gdbarch_deprecated_push_arguments (gdbarch
, mcore_push_arguments
);
1082 set_gdbarch_deprecated_init_extra_frame_info (gdbarch
, mcore_init_extra_frame_info
);
1083 set_gdbarch_deprecated_frame_chain (gdbarch
, mcore_frame_chain
);
1084 set_gdbarch_deprecated_frame_init_saved_regs (gdbarch
, mcore_frame_init_saved_regs
);
1085 set_gdbarch_deprecated_frame_saved_pc (gdbarch
, mcore_frame_saved_pc
);
1086 set_gdbarch_deprecated_store_return_value (gdbarch
, mcore_store_return_value
);
1087 set_gdbarch_deprecated_extract_return_value (gdbarch
,
1088 mcore_extract_return_value
);
1089 set_gdbarch_deprecated_store_struct_return (gdbarch
, mcore_store_struct_return
);
1090 set_gdbarch_deprecated_extract_struct_value_address (gdbarch
,
1091 mcore_extract_struct_value_address
);
1092 set_gdbarch_skip_prologue (gdbarch
, mcore_skip_prologue
);
1093 set_gdbarch_frame_args_skip (gdbarch
, 0);
1094 set_gdbarch_deprecated_frame_args_address (gdbarch
, mcore_frame_args_address
);
1095 set_gdbarch_deprecated_frame_locals_address (gdbarch
, mcore_frame_locals_address
);
1096 set_gdbarch_deprecated_pop_frame (gdbarch
, mcore_pop_frame
);
1097 set_gdbarch_virtual_frame_pointer (gdbarch
, mcore_virtual_frame_pointer
);
1101 /* Stack grows down. */
1102 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1103 set_gdbarch_use_struct_convention (gdbarch
, mcore_use_struct_convention
);
1104 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
1105 /* MCore will never pass a sturcture by reference. It will always be split
1106 between registers and stack. */
1107 set_gdbarch_deprecated_reg_struct_has_addr
1108 (gdbarch
, mcore_reg_struct_has_addr
);
1110 /* Should be using push_dummy_call. */
1111 set_gdbarch_deprecated_dummy_write_sp (gdbarch
, deprecated_write_sp
);
1113 set_gdbarch_print_insn (gdbarch
, print_insn_mcore
);
1119 mcore_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
1124 extern initialize_file_ftype _initialize_mcore_tdep
; /* -Wmissing-prototypes */
1127 _initialize_mcore_tdep (void)
1129 gdbarch_register (bfd_arch_mcore
, mcore_gdbarch_init
, mcore_dump_tdep
);
1132 add_show_from_set (add_set_cmd ("mcoredebug", no_class
,
1133 var_boolean
, (char *) &mcore_debug
,
1134 "Set mcore debugging.\n", &setlist
),