1 /* Target-machine dependent code for Hitachi H8/300, for GDB.
3 Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
4 1999, 2000, 2001, 2002, 2003 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 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 Contributed by Steve Chamberlain
32 #include "arch-utils.h"
37 #include "gdb_assert.h"
39 /* Extra info which is saved in each frame_info. */
40 struct frame_extra_info
49 h8300_max_reg_size = 4,
51 #define BINWORD (h8300hmode ? h8300h_reg_size : h8300_reg_size)
55 E_R0_REGNUM, E_ER0_REGNUM = E_R0_REGNUM, E_ARG0_REGNUM = E_R0_REGNUM,
56 E_RET0_REGNUM = E_R0_REGNUM,
57 E_R1_REGNUM, E_ER1_REGNUM = E_R1_REGNUM, E_RET1_REGNUM = E_R1_REGNUM,
58 E_R2_REGNUM, E_ER2_REGNUM = E_R2_REGNUM, E_ARGLAST_REGNUM = E_R2_REGNUM,
59 E_R3_REGNUM, E_ER3_REGNUM = E_R3_REGNUM,
60 E_R4_REGNUM, E_ER4_REGNUM = E_R4_REGNUM,
61 E_R5_REGNUM, E_ER5_REGNUM = E_R5_REGNUM,
62 E_R6_REGNUM, E_ER6_REGNUM = E_R6_REGNUM, E_FP_REGNUM = E_R6_REGNUM,
67 E_TICK_REGNUM, E_EXR_REGNUM = E_TICK_REGNUM,
68 E_INST_REGNUM, E_TICKS_REGNUM = E_INST_REGNUM,
76 #define UNSIGNED_SHORT(X) ((X) & 0xffff)
78 #define IS_PUSH(x) ((x & 0xfff0)==0x6df0)
79 #define IS_PUSH_FP(x) (x == 0x6df6)
80 #define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6)
81 #define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6)
82 #define IS_SUB2_SP(x) (x==0x1b87)
83 #define IS_SUB4_SP(x) (x==0x1b97)
84 #define IS_SUBL_SP(x) (x==0x7a37)
85 #define IS_MOVK_R5(x) (x==0x7905)
86 #define IS_SUB_R5SP(x) (x==0x1957)
88 /* If the instruction at PC is an argument register spill, return its
89 length. Otherwise, return zero.
91 An argument register spill is an instruction that moves an argument
92 from the register in which it was passed to the stack slot in which
93 it really lives. It is a byte, word, or longword move from an
94 argument register to a negative offset from the frame pointer. */
97 h8300_is_argument_spill (CORE_ADDR pc)
99 int w = read_memory_unsigned_integer (pc, 2);
101 if ((w & 0xfff0) == 0x6ee0 /* mov.b Rs,@(d:16,er6) */
102 && 8 <= (w & 0xf) && (w & 0xf) <= 10) /* Rs is R0L, R1L, or R2L */
104 int w2 = read_memory_integer (pc + 2, 2);
106 /* ... and d:16 is negative. */
110 else if (w == 0x7860)
112 int w2 = read_memory_integer (pc + 2, 2);
114 if ((w2 & 0xfff0) == 0x6aa0) /* mov.b Rs, @(d:24,er6) */
116 LONGEST disp = read_memory_integer (pc + 4, 4);
118 /* ... and d:24 is negative. */
119 if (disp < 0 && disp > 0xffffff)
123 else if ((w & 0xfff0) == 0x6fe0 /* mov.w Rs,@(d:16,er6) */
124 && (w & 0xf) <= 2) /* Rs is R0, R1, or R2 */
126 int w2 = read_memory_integer (pc + 2, 2);
128 /* ... and d:16 is negative. */
132 else if (w == 0x78e0)
134 int w2 = read_memory_integer (pc + 2, 2);
136 if ((w2 & 0xfff0) == 0x6ba0) /* mov.b Rs, @(d:24,er6) */
138 LONGEST disp = read_memory_integer (pc + 4, 4);
140 /* ... and d:24 is negative. */
141 if (disp < 0 && disp > 0xffffff)
145 else if (w == 0x0100)
147 int w2 = read_memory_integer (pc + 2, 2);
149 if ((w2 & 0xfff0) == 0x6fe0 /* mov.l Rs,@(d:16,er6) */
150 && (w2 & 0xf) <= 2) /* Rs is ER0, ER1, or ER2 */
152 int w3 = read_memory_integer (pc + 4, 2);
154 /* ... and d:16 is negative. */
158 else if (w2 == 0x78e0)
160 int w3 = read_memory_integer (pc + 4, 2);
162 if ((w3 & 0xfff0) == 0x6ba0) /* mov.l Rs, @(d:24,er6) */
164 LONGEST disp = read_memory_integer (pc + 6, 4);
166 /* ... and d:24 is negative. */
167 if (disp < 0 && disp > 0xffffff)
177 h8300_skip_prologue (CORE_ADDR start_pc)
182 /* Skip past all push and stm insns. */
185 w = read_memory_unsigned_integer (start_pc, 2);
186 /* First look for push insns. */
187 if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130)
189 w = read_memory_unsigned_integer (start_pc + 2, 2);
195 start_pc += 2 + adjust;
196 w = read_memory_unsigned_integer (start_pc, 2);
203 /* Skip past a move to FP, either word or long sized */
204 w = read_memory_unsigned_integer (start_pc, 2);
207 w = read_memory_unsigned_integer (start_pc + 2, 2);
213 start_pc += 2 + adjust;
214 w = read_memory_unsigned_integer (start_pc, 2);
217 /* Check for loading either a word constant into r5;
218 long versions are handled by the SUBL_SP below. */
222 w = read_memory_unsigned_integer (start_pc, 2);
225 /* Now check for subtracting r5 from sp, word sized only. */
228 start_pc += 2 + adjust;
229 w = read_memory_unsigned_integer (start_pc, 2);
232 /* Check for subs #2 and subs #4. */
233 while (IS_SUB2_SP (w) || IS_SUB4_SP (w))
235 start_pc += 2 + adjust;
236 w = read_memory_unsigned_integer (start_pc, 2);
239 /* Check for a 32bit subtract. */
241 start_pc += 6 + adjust;
243 /* Check for spilling an argument register to the stack frame.
244 This could also be an initializing store from non-prologue code,
245 but I don't think there's any harm in skipping that. */
248 int spill_size = h8300_is_argument_spill (start_pc);
251 start_pc += spill_size;
258 gdb_print_insn_h8300 (bfd_vma memaddr, disassemble_info * info)
261 return print_insn_h8300s (memaddr, info);
263 return print_insn_h8300h (memaddr, info);
265 return print_insn_h8300 (memaddr, info);
268 /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
269 is not the address of a valid instruction, the address of the next
270 instruction beyond ADDR otherwise. *PWORD1 receives the first word
271 of the instruction. */
274 h8300_next_prologue_insn (CORE_ADDR addr,
276 unsigned short* pword1)
281 read_memory (addr, buf, 2);
282 *pword1 = extract_signed_integer (buf, 2);
289 /* Examine the prologue of a function. `ip' points to the first instruction.
290 `limit' is the limit of the prologue (e.g. the addr of the first
291 linenumber, or perhaps the program counter if we're stepping through).
292 `frame_sp' is the stack pointer value in use in this frame.
293 `fsr' is a pointer to a frame_saved_regs structure into which we put
294 info about the registers saved by this frame.
295 `fi' is a struct frame_info pointer; we fill in various fields in it
296 to reflect the offsets of the arg pointer and the locals pointer. */
298 /* Any function with a frame looks like this
304 SAVED FP <-FP POINTS HERE
306 LOCALS1 <-SP POINTS HERE
310 h8300_examine_prologue (register CORE_ADDR ip, register CORE_ADDR limit,
311 CORE_ADDR after_prolog_fp, CORE_ADDR *fsr,
312 struct frame_info *fi)
314 register CORE_ADDR next_ip;
317 unsigned short insn_word;
318 /* Number of things pushed onto stack, starts at 2/4, 'cause the
319 PC is already there */
320 unsigned int reg_save_depth = BINWORD;
322 unsigned int auto_depth = 0; /* Number of bytes of autos */
324 char in_frame[11]; /* One for each reg */
328 memset (in_frame, 1, 11);
329 for (r = 0; r < 8; r++)
333 if (after_prolog_fp == 0)
335 after_prolog_fp = read_register (E_SP_REGNUM);
338 /* If the PC isn't valid, quit now. */
339 if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff))
342 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
344 if (insn_word == 0x0100)
346 insn_word = read_memory_unsigned_integer (ip + 2, 2);
350 /* Skip over any fp push instructions */
351 fsr[E_FP_REGNUM] = after_prolog_fp;
352 while (next_ip && IS_PUSH_FP (insn_word))
354 ip = next_ip + adjust;
356 in_frame[insn_word & 0x7] = reg_save_depth;
357 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
358 reg_save_depth += 2 + adjust;
361 /* Is this a move into the fp */
362 if (next_ip && IS_MOV_SP_FP (insn_word))
365 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
369 /* Skip over any stack adjustment, happens either with a number of
370 sub#2,sp or a mov #x,r5 sub r5,sp */
372 if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
374 while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
376 auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4;
378 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
383 if (next_ip && IS_MOVK_R5 (insn_word))
386 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
387 auto_depth += insn_word;
389 next_ip = h8300_next_prologue_insn (next_ip, limit, &insn_word);
390 auto_depth += insn_word;
392 if (next_ip && IS_SUBL_SP (insn_word))
395 auto_depth += read_memory_unsigned_integer (ip, 4);
398 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
402 /* Now examine the push insns to determine where everything lives
410 if (insn_word == 0x0100)
413 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
417 if (IS_PUSH (insn_word))
419 auto_depth += 2 + adjust;
420 fsr[insn_word & 0x7] = after_prolog_fp - auto_depth;
422 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
426 /* Now check for push multiple insns. */
427 if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130)
429 int count = ((insn_word >> 4) & 0xf) + 1;
433 next_ip = h8300_next_prologue_insn (ip, limit, &insn_word);
434 start = insn_word & 0x7;
436 for (i = start; i < start + count; i++)
439 fsr[i] = after_prolog_fp - auto_depth;
445 /* The PC is at a known place */
446 get_frame_extra_info (fi)->from_pc =
447 read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD);
449 /* Rememeber any others too */
450 in_frame[E_PC_REGNUM] = 0;
453 /* We keep the old FP in the SP spot */
454 fsr[E_SP_REGNUM] = read_memory_unsigned_integer (fsr[E_FP_REGNUM],
457 fsr[E_SP_REGNUM] = after_prolog_fp + auto_depth;
463 h8300_frame_init_saved_regs (struct frame_info *fi)
465 CORE_ADDR func_addr, func_end;
467 if (!get_frame_saved_regs (fi))
469 frame_saved_regs_zalloc (fi);
471 /* Find the beginning of this function, so we can analyze its
473 if (find_pc_partial_function (get_frame_pc (fi), NULL,
474 &func_addr, &func_end))
476 struct symtab_and_line sal = find_pc_line (func_addr, 0);
477 CORE_ADDR limit = (sal.end && sal.end < get_frame_pc (fi))
478 ? sal.end : get_frame_pc (fi);
479 /* This will fill in fields in fi. */
480 h8300_examine_prologue (func_addr, limit, get_frame_base (fi),
481 get_frame_saved_regs (fi), fi);
483 /* Else we're out of luck (can't debug completely stripped code).
488 /* Given a GDB frame, determine the address of the calling function's
489 frame. This will be used to create a new GDB frame struct, and
490 then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC
491 will be called for the new frame.
493 For us, the frame address is its stack pointer value, so we look up
494 the function prologue to determine the caller's sp value, and
498 h8300_frame_chain (struct frame_info *thisframe)
500 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (thisframe),
501 get_frame_base (thisframe),
502 get_frame_base (thisframe)))
503 { /* initialize the from_pc now */
504 get_frame_extra_info (thisframe)->from_pc =
505 deprecated_read_register_dummy (get_frame_pc (thisframe),
506 get_frame_base (thisframe),
508 return get_frame_base (thisframe);
510 return get_frame_saved_regs (thisframe)[E_SP_REGNUM];
513 /* Return the saved PC from this frame.
515 If the frame has a memory copy of SRP_REGNUM, use that. If not,
516 just use the register SRP_REGNUM itself. */
519 h8300_frame_saved_pc (struct frame_info *frame)
521 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
522 get_frame_base (frame),
523 get_frame_base (frame)))
524 return deprecated_read_register_dummy (get_frame_pc (frame),
525 get_frame_base (frame),
528 return get_frame_extra_info (frame)->from_pc;
532 h8300_init_extra_frame_info (int fromleaf, struct frame_info *fi)
534 if (!get_frame_extra_info (fi))
536 frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
537 get_frame_extra_info (fi)->from_pc = 0;
539 if (!get_frame_pc (fi))
541 if (get_next_frame (fi))
542 deprecated_update_frame_pc_hack (fi, h8300_frame_saved_pc (get_next_frame (fi)));
544 h8300_frame_init_saved_regs (fi);
548 /* Round N up or down to the nearest multiple of UNIT.
549 Evaluate N only once, UNIT several times.
550 UNIT must be a power of two. */
551 #define round_up(n, unit) (((n) + (unit) - 1) & -(unit))
552 #define round_down(n, unit) ((n) & -(unit))
554 /* Function: push_arguments
555 Setup the function arguments for calling a function in the inferior.
556 In this discussion, a `word' is 16 bits on the H8/300s, and 32 bits
559 There are actually two ABI's here: -mquickcall (the default) and
560 -mno-quickcall. With -mno-quickcall, all arguments are passed on
561 the stack after the return address, word-aligned. With
562 -mquickcall, GCC tries to use r0 -- r2 to pass registers. Since
563 GCC doesn't indicate in the object file which ABI was used to
564 compile it, GDB only supports the default --- -mquickcall.
566 Here are the rules for -mquickcall, in detail:
568 Each argument, whether scalar or aggregate, is padded to occupy a
569 whole number of words. Arguments smaller than a word are padded at
570 the most significant end; those larger than a word are padded at
571 the least significant end.
573 The initial arguments are passed in r0 -- r2. Earlier arguments go in
574 lower-numbered registers. Multi-word arguments are passed in
575 consecutive registers, with the most significant end in the
576 lower-numbered register.
578 If an argument doesn't fit entirely in the remaining registers, it
579 is passed entirely on the stack. Stack arguments begin just after
580 the return address. Once an argument has overflowed onto the stack
581 this way, all subsequent arguments are passed on the stack.
583 The above rule has odd consequences. For example, on the h8/300s,
584 if a function takes two longs and an int as arguments:
585 - the first long will be passed in r0/r1,
586 - the second long will be passed entirely on the stack, since it
588 - and the int will be passed on the stack, even though it could fit
591 A weird exception: if an argument is larger than a word, but not a
592 whole number of words in length (before padding), it is passed on
593 the stack following the rules for stack arguments above, even if
594 there are sufficient registers available to hold it. Stranger
595 still, the argument registers are still `used up' --- even though
596 there's nothing in them.
598 So, for example, on the h8/300s, if a function expects a three-byte
599 structure and an int, the structure will go on the stack, and the
600 int will go in r2, not r0.
602 If the function returns an aggregate type (struct, union, or class)
603 by value, the caller must allocate space to hold the return value,
604 and pass the callee a pointer to this space as an invisible first
607 For varargs functions, the last fixed argument and all the variable
608 arguments are always passed on the stack. This means that calls to
609 varargs functions don't work properly unless there is a prototype
612 Basically, this ABI is not good, for the following reasons:
613 - You can't call vararg functions properly unless a prototype is in scope.
614 - Structure passing is inconsistent, to no purpose I can see.
615 - It often wastes argument registers, of which there are only three
619 h8300_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
620 int struct_return, CORE_ADDR struct_addr)
622 int stack_align, stack_alloc, stack_offset;
623 int wordsize = BINWORD;
627 /* First, make sure the stack is properly aligned. */
628 sp = round_down (sp, wordsize);
630 /* Now make sure there's space on the stack for the arguments. We
631 may over-allocate a little here, but that won't hurt anything. */
633 for (argument = 0; argument < nargs; argument++)
634 stack_alloc += round_up (TYPE_LENGTH (VALUE_TYPE (args[argument])),
638 /* Now load as many arguments as possible into registers, and push
639 the rest onto the stack. */
643 /* If we're returning a structure by value, then we must pass a
644 pointer to the buffer for the return value as an invisible first
647 write_register (reg++, struct_addr);
649 for (argument = 0; argument < nargs; argument++)
651 struct type *type = VALUE_TYPE (args[argument]);
652 int len = TYPE_LENGTH (type);
653 char *contents = (char *) VALUE_CONTENTS (args[argument]);
655 /* Pad the argument appropriately. */
656 int padded_len = round_up (len, wordsize);
657 char *padded = alloca (padded_len);
659 memset (padded, 0, padded_len);
660 memcpy (len < wordsize ? padded + padded_len - len : padded,
663 /* Could the argument fit in the remaining registers? */
664 if (padded_len <= (E_ARGLAST_REGNUM - reg + 1) * wordsize)
666 /* Are we going to pass it on the stack anyway, for no good
668 if (len > wordsize && len % wordsize)
670 /* I feel so unclean. */
671 write_memory (sp + stack_offset, padded, padded_len);
672 stack_offset += padded_len;
674 /* That's right --- even though we passed the argument
675 on the stack, we consume the registers anyway! Love
677 reg += padded_len / wordsize;
681 /* Heavens to Betsy --- it's really going in registers!
682 It would be nice if we could use write_register_bytes
683 here, but on the h8/300s, there are gaps between
684 the registers in the register file. */
687 for (offset = 0; offset < padded_len; offset += wordsize)
689 ULONGEST word = extract_unsigned_integer (padded + offset,
691 write_register (reg++, word);
697 /* It doesn't fit in registers! Onto the stack it goes. */
698 write_memory (sp + stack_offset, padded, padded_len);
699 stack_offset += padded_len;
701 /* Once one argument has spilled onto the stack, all
702 subsequent arguments go on the stack. */
703 reg = E_ARGLAST_REGNUM + 1;
710 /* Function: push_return_address
711 Setup the return address for a dummy frame, as called by
712 call_function_by_hand. Only necessary when you are using an
713 empty CALL_DUMMY, ie. the target will not actually be executing
714 a JSR/BSR instruction. */
717 h8300_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
719 unsigned char buf[4];
720 int wordsize = BINWORD;
723 store_unsigned_integer (buf, wordsize, CALL_DUMMY_ADDRESS ());
724 write_memory (sp, buf, wordsize);
728 /* Function: h8300_pop_frame
729 Restore the machine to the state it had before the current frame
730 was created. Usually used either by the "RETURN" command, or by
731 call_function_by_hand after the dummy_frame is finished. */
734 h8300_pop_frame (void)
737 struct frame_info *frame = get_current_frame ();
739 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
740 get_frame_base (frame),
741 get_frame_base (frame)))
743 generic_pop_dummy_frame ();
747 for (regno = 0; regno < 8; regno++)
749 /* Don't forget E_SP_REGNUM is a frame_saved_regs struct is the
750 actual value we want, not the address of the value we want. */
751 if (get_frame_saved_regs (frame)[regno] && regno != E_SP_REGNUM)
752 write_register (regno,
754 (get_frame_saved_regs (frame)[regno], BINWORD));
755 else if (get_frame_saved_regs (frame)[regno] && regno == E_SP_REGNUM)
756 write_register (regno, get_frame_base (frame) + 2 * BINWORD);
759 /* Don't forget to update the PC too! */
760 write_register (E_PC_REGNUM, get_frame_extra_info (frame)->from_pc);
762 flush_cached_frames ();
765 /* Function: extract_return_value
766 Figure out where in REGBUF the called function has left its return value.
767 Copy that into VALBUF. Be sure to account for CPU type. */
770 h8300_extract_return_value (struct type *type, struct regcache *regcache,
773 int len = TYPE_LENGTH (type);
780 regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c);
781 store_unsigned_integer (valbuf, len, c);
783 case 4: /* Needs two registers on plain H8/300 */
784 regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c);
785 store_unsigned_integer (valbuf, 2, c);
786 regcache_cooked_read_unsigned (regcache, E_RET1_REGNUM, &c);
787 store_unsigned_integer ((void*)((char *)valbuf + 2), 2, c);
789 case 8: /* long long, double and long double are all defined
790 as 4 byte types so far so this shouldn't happen. */
791 error ("I don't know how a 8 byte value is returned.");
797 h8300h_extract_return_value (struct type *type, struct regcache *regcache,
800 int len = TYPE_LENGTH (type);
808 regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c);
809 store_unsigned_integer (valbuf, len, c);
811 case 8: /* long long, double and long double are all defined
812 as 4 byte types so far so this shouldn't happen. */
813 error ("I don't know how a 8 byte value is returned.");
819 /* Function: store_return_value
820 Place the appropriate value in the appropriate registers.
821 Primarily used by the RETURN command. */
824 h8300_store_return_value (struct type *type, struct regcache *regcache,
827 int len = TYPE_LENGTH (type);
834 val = extract_unsigned_integer (valbuf, len);
835 regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM, val);
837 case 4: /* long, float */
838 val = extract_unsigned_integer (valbuf, len);
839 regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM,
840 (val >> 16) &0xffff);
841 regcache_cooked_write_unsigned (regcache, E_RET1_REGNUM, val & 0xffff);
843 case 8: /* long long, double and long double are all defined
844 as 4 byte types so far so this shouldn't happen. */
845 error ("I don't know how to return a 8 byte value.");
851 h8300h_store_return_value (struct type *type, struct regcache *regcache,
854 int len = TYPE_LENGTH (type);
861 case 4: /* long, float */
862 val = extract_unsigned_integer (valbuf, len);
863 regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM, val);
865 case 8: /* long long, double and long double are all defined
866 as 4 byte types so far so this shouldn't happen. */
867 error ("I don't know how to return a 8 byte value.");
872 static struct cmd_list_element *setmachinelist;
875 h8300_register_name (int regno)
877 /* The register names change depending on which h8300 processor
879 static char *register_names[] = {
880 "r0", "r1", "r2", "r3", "r4", "r5", "r6",
881 "sp", "ccr","pc","cycles", "tick", "inst", ""
884 || regno >= (sizeof (register_names) / sizeof (*register_names)))
885 internal_error (__FILE__, __LINE__,
886 "h8300_register_name: illegal register number %d", regno);
888 return register_names[regno];
892 h8300s_register_name (int regno)
894 static char *register_names[] = {
895 "er0", "er1", "er2", "er3", "er4", "er5", "er6",
896 "sp", "ccr", "pc", "cycles", "exr", "tick", "inst"
899 || regno >= (sizeof (register_names) / sizeof (*register_names)))
900 internal_error (__FILE__, __LINE__,
901 "h8300s_register_name: illegal register number %d", regno);
903 return register_names[regno];
907 h8300sx_register_name (int regno)
909 static char *register_names[] = {
910 "er0", "er1", "er2", "er3", "er4", "er5", "er6",
911 "sp", "ccr", "pc", "cycles", "exr", "tick", "inst",
912 "mach", "macl", "sbr", "vbr"
915 || regno >= (sizeof (register_names) / sizeof (*register_names)))
916 internal_error (__FILE__, __LINE__,
917 "h8300sx_register_name: illegal register number %d", regno);
919 return register_names[regno];
923 h8300_print_register (struct gdbarch *gdbarch, struct ui_file *file,
924 struct frame_info *frame, int regno)
927 const char *name = gdbarch_register_name (gdbarch, regno);
932 frame_read_signed_register (frame, regno, &rval);
934 fprintf_filtered (file, "%-14s ", name);
935 if (regno == E_CCR_REGNUM || (regno == E_EXR_REGNUM && h8300smode))
937 fprintf_filtered (file, "0x%02x ", (unsigned char)rval);
938 print_longest (file, 'u', 1, rval);
942 fprintf_filtered (file, "0x%s ", phex ((ULONGEST)rval, BINWORD));
943 print_longest (file, 'd', 1, rval);
945 if (regno == E_CCR_REGNUM)
949 unsigned char l = rval & 0xff;
950 fprintf_filtered (file, "\t");
951 fprintf_filtered (file, "I-%d ", (l & 0x80) != 0);
952 fprintf_filtered (file, "UI-%d ", (l & 0x40) != 0);
953 fprintf_filtered (file, "H-%d ", (l & 0x20) != 0);
954 fprintf_filtered (file, "U-%d ", (l & 0x10) != 0);
959 fprintf_filtered (file, "N-%d ", N);
960 fprintf_filtered (file, "Z-%d ", Z);
961 fprintf_filtered (file, "V-%d ", V);
962 fprintf_filtered (file, "C-%d ", C);
964 fprintf_filtered (file, "u> ");
966 fprintf_filtered (file, "u<= ");
968 fprintf_filtered (file, "u>= ");
970 fprintf_filtered (file, "u< ");
972 fprintf_filtered (file, "!= ");
974 fprintf_filtered (file, "== ");
976 fprintf_filtered (file, ">= ");
978 fprintf_filtered (file, "< ");
979 if ((Z | (N ^ V)) == 0)
980 fprintf_filtered (file, "> ");
981 if ((Z | (N ^ V)) == 1)
982 fprintf_filtered (file, "<= ");
984 else if (regno == E_EXR_REGNUM && h8300smode)
987 unsigned char l = rval & 0xff;
988 fprintf_filtered (file, "\t");
989 fprintf_filtered (file, "T-%d - - - ", (l & 0x80) != 0);
990 fprintf_filtered (file, "I2-%d ", (l & 4) != 0);
991 fprintf_filtered (file, "I1-%d ", (l & 2) != 0);
992 fprintf_filtered (file, "I0-%d", (l & 1) != 0);
994 fprintf_filtered (file, "\n");
998 h8300_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file,
999 struct frame_info *frame, int regno, int cpregs)
1002 for (regno = 0; regno < NUM_REGS; ++regno)
1003 h8300_print_register (gdbarch, file, frame, regno);
1005 h8300_print_register (gdbarch, file, frame, regno);
1009 h8300_saved_pc_after_call (struct frame_info *ignore)
1011 return read_memory_unsigned_integer (read_register (E_SP_REGNUM), BINWORD);
1014 static struct type *
1015 h8300_register_type (struct gdbarch *gdbarch, int regno)
1017 if (regno < 0 || regno >= NUM_REGS)
1018 internal_error (__FILE__, __LINE__,
1019 "h8300_register_type: illegal register number %d",
1026 return builtin_type_void_func_ptr;
1029 return builtin_type_void_data_ptr;
1031 return builtin_type_uint8;
1034 return builtin_type_uint8;
1037 return h8300hmode ? builtin_type_int32
1038 : builtin_type_int16;
1044 h8300_extract_struct_value_address (struct regcache *regcache)
1047 regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &addr);
1051 const static unsigned char *
1052 h8300_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
1054 /*static unsigned char breakpoint[] = { 0x7A, 0xFF };*/ /* ??? */
1055 static unsigned char breakpoint[] = { 0x01, 0x80 }; /* Sleep */
1057 *lenptr = sizeof (breakpoint);
1062 h8300_push_dummy_code (struct gdbarch *gdbarch,
1063 CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc,
1064 struct value **args, int nargs,
1065 struct type *value_type,
1066 CORE_ADDR *real_pc, CORE_ADDR *bp_addr)
1068 /* Allocate space sufficient for a breakpoint. */
1070 /* Store the address of that breakpoint */
1072 /* h8300 always starts the call at the callee's entry point. */
1078 h8300_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
1079 struct frame_info *frame, const char *args)
1081 fprintf_filtered (file, "\
1082 No floating-point info available for this processor.\n");
1085 static struct gdbarch *
1086 h8300_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
1088 struct gdbarch_tdep *tdep = NULL;
1089 struct gdbarch *gdbarch;
1091 arches = gdbarch_list_lookup_by_info (arches, &info);
1093 return arches->gdbarch;
1096 tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
1099 if (info.bfd_arch_info->arch != bfd_arch_h8300)
1102 gdbarch = gdbarch_alloc (&info, 0);
1104 switch (info.bfd_arch_info->mach)
1106 case bfd_mach_h8300:
1110 set_gdbarch_num_regs (gdbarch, 13);
1111 set_gdbarch_register_name (gdbarch, h8300_register_name);
1112 set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1113 set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1114 set_gdbarch_extract_return_value (gdbarch, h8300_extract_return_value);
1115 set_gdbarch_store_return_value (gdbarch, h8300_store_return_value);
1117 case bfd_mach_h8300h:
1118 case bfd_mach_h8300hn:
1122 set_gdbarch_num_regs (gdbarch, 13);
1123 set_gdbarch_register_name (gdbarch, h8300_register_name);
1124 set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1125 set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1126 set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value);
1127 set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value);
1129 case bfd_mach_h8300s:
1130 case bfd_mach_h8300sn:
1134 set_gdbarch_num_regs (gdbarch, 14);
1135 set_gdbarch_register_name (gdbarch, h8300s_register_name);
1136 set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1137 set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1138 set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value);
1139 set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value);
1141 case bfd_mach_h8300sx:
1142 case bfd_mach_h8300sxn:
1146 set_gdbarch_num_regs (gdbarch, 18);
1147 set_gdbarch_register_name (gdbarch, h8300sx_register_name);
1148 set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1149 set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1150 set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value);
1151 set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value);
1155 /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
1156 ready to unwind the PC first (see frame.c:get_prev_frame()). */
1157 set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
1160 * Basic register fields and methods.
1163 set_gdbarch_num_pseudo_regs (gdbarch, 0);
1164 set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
1165 set_gdbarch_deprecated_fp_regnum (gdbarch, E_FP_REGNUM);
1166 set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
1167 set_gdbarch_register_type (gdbarch, h8300_register_type);
1168 set_gdbarch_print_registers_info (gdbarch, h8300_print_registers_info);
1169 set_gdbarch_print_float_info (gdbarch, h8300_print_float_info);
1174 set_gdbarch_skip_prologue (gdbarch, h8300_skip_prologue);
1176 set_gdbarch_deprecated_frame_init_saved_regs (gdbarch,
1177 h8300_frame_init_saved_regs);
1178 set_gdbarch_deprecated_init_extra_frame_info (gdbarch,
1179 h8300_init_extra_frame_info);
1180 set_gdbarch_deprecated_frame_chain (gdbarch, h8300_frame_chain);
1181 set_gdbarch_deprecated_saved_pc_after_call (gdbarch,
1182 h8300_saved_pc_after_call);
1183 set_gdbarch_deprecated_frame_saved_pc (gdbarch, h8300_frame_saved_pc);
1188 /* Stack grows up. */
1189 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1190 /* PC stops zero byte after a trap instruction
1191 (which means: exactly on trap instruction). */
1192 set_gdbarch_decr_pc_after_break (gdbarch, 0);
1193 /* This value is almost never non-zero... */
1194 set_gdbarch_function_start_offset (gdbarch, 0);
1195 /* This value is almost never non-zero... */
1196 set_gdbarch_frame_args_skip (gdbarch, 0);
1197 set_gdbarch_frameless_function_invocation (gdbarch,
1198 frameless_look_for_prologue);
1200 set_gdbarch_extract_struct_value_address (gdbarch,
1201 h8300_extract_struct_value_address);
1202 set_gdbarch_use_struct_convention (gdbarch, always_use_struct_convention);
1203 set_gdbarch_breakpoint_from_pc (gdbarch, h8300_breakpoint_from_pc);
1204 set_gdbarch_push_dummy_code (gdbarch, h8300_push_dummy_code);
1206 set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1207 set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1208 set_gdbarch_long_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1209 set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1210 set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1212 /* set_gdbarch_stack_align (gdbarch, SOME_stack_align); */
1213 set_gdbarch_believe_pcc_promotion (gdbarch, 1);
1218 * These values and methods are used when gdb calls a target function. */
1219 /* Can all be replaced by push_dummy_call */
1220 set_gdbarch_deprecated_push_return_address (gdbarch,
1221 h8300_push_return_address);
1222 set_gdbarch_deprecated_push_arguments (gdbarch, h8300_push_arguments);
1223 set_gdbarch_deprecated_pop_frame (gdbarch, h8300_pop_frame);
1224 set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
1230 extern initialize_file_ftype _initialize_h8300_tdep; /* -Wmissing-prototypes */
1233 _initialize_h8300_tdep (void)
1235 deprecated_tm_print_insn = gdb_print_insn_h8300;
1236 register_gdbarch_init (bfd_arch_h8300, h8300_gdbarch_init);