1 /* Target-machine dependent code for Hitachi H8/300, for GDB.
2 Copyright (C) 1988, 1990, 1991 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. */
21 Contributed by Steve Chamberlain
33 #include "gdb_string.h"
40 #define UNSIGNED_SHORT(X) ((X) & 0xffff)
42 /* an easy to debug H8 stack frame looks like:
46 0x7905 nnnn mov.w #n,r5 or 0x1b87 subs #2,sp
51 #define IS_PUSH(x) ((x & 0xfff0)==0x6df0)
52 #define IS_PUSH_FP(x) (x == 0x6df6)
53 #define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6)
54 #define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6)
55 #define IS_SUB2_SP(x) (x==0x1b87)
56 #define IS_SUB4_SP(x) (x==0x1b97)
57 #define IS_SUBL_SP(x) (x==0x7a37)
58 #define IS_MOVK_R5(x) (x==0x7905)
59 #define IS_SUB_R5SP(x) (x==0x1957)
61 /* Local function declarations. */
63 static CORE_ADDR examine_prologue ();
64 static void set_machine_hook PARAMS ((char *filename));
66 void frame_find_saved_regs ();
68 h8300_skip_prologue (start_pc)
74 w = read_memory_unsigned_integer (start_pc, 2);
77 w = read_memory_unsigned_integer (start_pc + 2, 2);
81 /* Skip past all push insns */
82 while (IS_PUSH_FP (w))
84 start_pc += 2 + adjust;
85 w = read_memory_unsigned_integer (start_pc, 2);
88 /* Skip past a move to FP */
92 w = read_memory_unsigned_integer (start_pc, 2);
95 /* Skip the stack adjust */
100 w = read_memory_unsigned_integer (start_pc, 2);
105 w = read_memory_unsigned_integer (start_pc, 2);
107 while (IS_SUB2_SP (w) || IS_SUB4_SP (w))
110 w = read_memory_unsigned_integer (start_pc, 2);
120 gdb_print_insn_h8300 (memaddr, info)
122 disassemble_info *info;
124 /* start-sanitize-h8s */
126 return print_insn_h8300s (memaddr, info);
128 /* end-sanitize-h8s */
130 return print_insn_h8300h (memaddr, info);
132 return print_insn_h8300 (memaddr, info);
135 /* Given a GDB frame, determine the address of the calling function's frame.
136 This will be used to create a new GDB frame struct, and then
137 INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
139 For us, the frame address is its stack pointer value, so we look up
140 the function prologue to determine the caller's sp value, and return it. */
143 h8300_frame_chain (thisframe)
144 struct frame_info *thisframe;
146 frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
147 return thisframe->fsr->regs[SP_REGNUM];
150 /* Put here the code to store, into a struct frame_saved_regs,
151 the addresses of the saved registers of frame described by FRAME_INFO.
152 This includes special registers such as pc and fp saved in special
153 ways in the stack frame. sp is even more special:
154 the address we return for it IS the sp for the next frame.
156 We cache the result of doing this in the frame_cache_obstack, since
157 it is fairly expensive. */
160 frame_find_saved_regs (fi, fsr)
161 struct frame_info *fi;
162 struct frame_saved_regs *fsr;
164 register struct frame_saved_regs *cache_fsr;
165 extern struct obstack frame_cache_obstack;
167 struct symtab_and_line sal;
172 cache_fsr = (struct frame_saved_regs *)
173 obstack_alloc (&frame_cache_obstack,
174 sizeof (struct frame_saved_regs));
175 memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
179 /* Find the start and end of the function prologue. If the PC
180 is in the function prologue, we only consider the part that
181 has executed already. */
183 ip = get_pc_function_start (fi->pc);
184 sal = find_pc_line (ip, 0);
185 limit = (sal.end && sal.end < fi->pc) ? sal.end : fi->pc;
187 /* This will fill in fields in *fi as well as in cache_fsr. */
188 examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
195 /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
196 is not the address of a valid instruction, the address of the next
197 instruction beyond ADDR otherwise. *PWORD1 receives the first word
198 of the instruction.*/
201 NEXT_PROLOGUE_INSN (addr, lim, pword1)
209 read_memory (addr, buf, 2);
210 *pword1 = extract_signed_integer (buf, 2);
217 /* Examine the prologue of a function. `ip' points to the first instruction.
218 `limit' is the limit of the prologue (e.g. the addr of the first
219 linenumber, or perhaps the program counter if we're stepping through).
220 `frame_sp' is the stack pointer value in use in this frame.
221 `fsr' is a pointer to a frame_saved_regs structure into which we put
222 info about the registers saved by this frame.
223 `fi' is a struct frame_info pointer; we fill in various fields in it
224 to reflect the offsets of the arg pointer and the locals pointer. */
227 examine_prologue (ip, limit, after_prolog_fp, fsr, fi)
228 register CORE_ADDR ip;
229 register CORE_ADDR limit;
230 CORE_ADDR after_prolog_fp;
231 struct frame_saved_regs *fsr;
232 struct frame_info *fi;
234 register CORE_ADDR next_ip;
238 /* Number of things pushed onto stack, starts at 2/4, 'cause the
239 PC is already there */
240 unsigned int reg_save_depth = h8300hmode ? 4 : 2;
242 unsigned int auto_depth = 0; /* Number of bytes of autos */
244 char in_frame[11]; /* One for each reg */
248 memset (in_frame, 1, 11);
249 for (r = 0; r < 8; r++)
253 if (after_prolog_fp == 0)
255 after_prolog_fp = read_register (SP_REGNUM);
257 if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff))
260 next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
262 if (insn_word == 0x0100)
264 insn_word = read_memory_unsigned_integer (ip + 2, 2);
268 /* Skip over any fp push instructions */
269 fsr->regs[6] = after_prolog_fp;
270 while (next_ip && IS_PUSH_FP (insn_word))
272 ip = next_ip + adjust;
274 in_frame[insn_word & 0x7] = reg_save_depth;
275 next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
276 reg_save_depth += 2 + adjust;
279 /* Is this a move into the fp */
280 if (next_ip && IS_MOV_SP_FP (insn_word))
283 next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
287 /* Skip over any stack adjustment, happens either with a number of
288 sub#2,sp or a mov #x,r5 sub r5,sp */
290 if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
292 while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
294 auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4;
296 next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
301 if (next_ip && IS_MOVK_R5 (insn_word))
304 next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
305 auto_depth += insn_word;
307 next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn_word);
308 auto_depth += insn_word;
310 if (next_ip && IS_SUBL_SP (insn_word))
313 auto_depth += read_memory_unsigned_integer (ip, 4);
316 next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
320 /* Work out which regs are stored where */
321 while (next_ip && IS_PUSH (insn_word))
324 next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
325 fsr->regs[r] = after_prolog_fp + auto_depth;
329 /* The args are always reffed based from the stack pointer */
330 fi->args_pointer = after_prolog_fp;
331 /* Locals are always reffed based from the fp */
332 fi->locals_pointer = after_prolog_fp;
333 /* The PC is at a known place */
334 fi->from_pc = read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD);
336 /* Rememeber any others too */
337 in_frame[PC_REGNUM] = 0;
340 /* We keep the old FP in the SP spot */
341 fsr->regs[SP_REGNUM] = read_memory_unsigned_integer (fsr->regs[6], BINWORD);
343 fsr->regs[SP_REGNUM] = after_prolog_fp + auto_depth;
349 init_extra_frame_info (fromleaf, fi)
351 struct frame_info *fi;
353 fi->fsr = 0; /* Not yet allocated */
354 fi->args_pointer = 0; /* Unknown */
355 fi->locals_pointer = 0; /* Unknown */
359 /* Return the saved PC from this frame.
361 If the frame has a memory copy of SRP_REGNUM, use that. If not,
362 just use the register SRP_REGNUM itself. */
365 frame_saved_pc (frame)
366 struct frame_info *frame;
368 return frame->from_pc;
372 frame_locals_address (fi)
373 struct frame_info *fi;
375 if (!fi->locals_pointer)
377 struct frame_saved_regs ignore;
379 get_frame_saved_regs (fi, &ignore);
382 return fi->locals_pointer;
385 /* Return the address of the argument block for the frame
386 described by FI. Returns 0 if the address is unknown. */
389 frame_args_address (fi)
390 struct frame_info *fi;
392 if (!fi->args_pointer)
394 struct frame_saved_regs ignore;
396 get_frame_saved_regs (fi, &ignore);
400 return fi->args_pointer;
407 struct frame_saved_regs fsr;
408 struct frame_info *frame = get_current_frame ();
410 get_frame_saved_regs (frame, &fsr);
412 for (regnum = 0; regnum < 8; regnum++)
414 /* Don't forget SP_REGNUM is a frame_saved_regs struct is the
415 actual value we want, not the address of the value we want. */
416 if (fsr.regs[regnum] && regnum != SP_REGNUM)
417 write_register (regnum, read_memory_integer(fsr.regs[regnum], BINWORD));
418 else if (fsr.regs[regnum] && regnum == SP_REGNUM)
419 write_register (regnum, fsr.regs[regnum]);
422 /* Don't forget the update the PC too! */
423 write_pc (frame->from_pc);
424 flush_cached_frames ();
428 struct cmd_list_element *setmemorylist;
431 h8300_command(args, from_tty)
433 extern int h8300hmode;
435 /* start-sanitize-h8s */
437 /* end-sanitize-h8s */
441 h8300h_command(args, from_tty)
443 extern int h8300hmode;
445 /* start-sanitize-h8s */
447 /* end-sanitize-h8s */
449 /* start-sanitize-h8s */
451 h8300s_command(args, from_tty)
453 extern int h8300smode;
454 extern int h8300hmode;
458 /* end-santiize-h8s */
462 set_machine (args, from_tty)
466 printf_unfiltered ("\"set machine\" must be followed by h8300, h8300h");
467 /* start-sanitize-h8s */
468 printf_unfiltered ("or h8300s");
469 /* end-sanitize-h8s */
470 help_list (setmemorylist, "set memory ", -1, gdb_stdout);
473 /* set_machine_hook is called as the exec file is being opened, but
474 before the symbol file is opened. This allows us to set the
475 h8300hmode flag based on the machine type specified in the exec
476 file. This in turn will cause subsequently defined pointer types
477 to be 16 or 32 bits as appropriate for the machine. */
480 set_machine_hook (filename)
483 /* start-sanitize-h8s */
484 if (bfd_get_mach (exec_bfd) == bfd_mach_h8300s)
490 /* end-sanitize-h8s */
491 if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h)
493 /* start-sanitize-h8s */
495 /* end-sanitize-h8s */
500 /* start-sanitize-h8s */
502 /* end-sanitize-h8s */
508 _initialize_h8300m ()
510 add_prefix_cmd ("machine", no_class, set_machine,
511 "set the machine type", &setmemorylist, "set machine ", 0,
514 add_cmd ("h8300", class_support, h8300_command,
515 "Set machine to be H8/300.", &setmemorylist);
517 add_cmd ("h8300h", class_support, h8300h_command,
518 "Set machine to be H8/300H.", &setmemorylist);
520 /* start-sanitize-h8s */
521 add_cmd ("h8300s", class_support, h8300s_command,
522 "Set machine to be H8/300S.", &setmemorylist);
523 /* end-sanitize-h8s */
525 /* Add a hook to set the machine type when we're loading a file. */
527 specify_exec_file_hook(set_machine_hook);
533 print_register_hook (regno)
541 read_relative_register_raw_bytes (regno, b);
542 l = b[REGISTER_VIRTUAL_SIZE(8) -1];
543 printf_unfiltered ("\t");
544 printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
545 printf_unfiltered ("H-%d - ", (l & 0x20) != 0);
550 printf_unfiltered ("N-%d ", N);
551 printf_unfiltered ("Z-%d ", Z);
552 printf_unfiltered ("V-%d ", V);
553 printf_unfiltered ("C-%d ", C);
555 printf_unfiltered ("u> ");
557 printf_unfiltered ("u<= ");
559 printf_unfiltered ("u>= ");
561 printf_unfiltered ("u< ");
563 printf_unfiltered ("!= ");
565 printf_unfiltered ("== ");
567 printf_unfiltered (">= ");
569 printf_unfiltered ("< ");
570 if ((Z | (N ^ V)) == 0)
571 printf_unfiltered ("> ");
572 if ((Z | (N ^ V)) == 1)
573 printf_unfiltered ("<= ");
578 _initialize_h8300_tdep ()
580 tm_print_insn = gdb_print_insn_h8300;