1 /* Target-dependent code for Hitachi H8/500, for GDB.
3 Copyright 1993, 1994, 1995, 1998, 2000, 2001, 2002 Free Software
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
38 #define UNSIGNED_SHORT(X) ((X) & 0xffff)
40 static int code_size = 2;
42 static int data_size = 2;
44 /* Shape of an H8/500 frame :
50 return address <2 or 4 bytes>
59 /* an easy to debug H8 stack frame looks like:
63 0x7905 nnnn mov.w #n,r5 or 0x1b87 subs #2,sp
68 #define IS_PUSH(x) (((x) & 0xff00)==0x6d00)
69 #define IS_LINK_8(x) ((x) == 0x17)
70 #define IS_LINK_16(x) ((x) == 0x1f)
71 #define IS_MOVE_FP(x) ((x) == 0x0d76)
72 #define IS_MOV_SP_FP(x) ((x) == 0x0d76)
73 #define IS_SUB2_SP(x) ((x) == 0x1b87)
74 #define IS_MOVK_R5(x) ((x) == 0x7905)
75 #define IS_SUB_R5SP(x) ((x) == 0x1957)
83 h8500_skip_prologue (CORE_ADDR start_pc)
87 w = read_memory_integer (start_pc, 1);
91 w = read_memory_integer (start_pc, 1);
97 w = read_memory_integer (start_pc, 2);
104 h8500_addr_bits_remove (CORE_ADDR addr)
106 return ((addr) & 0xffffff);
109 /* Given a GDB frame, determine the address of the calling function's
110 frame. This will be used to create a new GDB frame struct, and
111 then INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC will be
112 called for the new frame.
114 For us, the frame address is its stack pointer value, so we look up
115 the function prologue to determine the caller's sp value, and return it. */
118 h8500_frame_chain (struct frame_info *thisframe)
120 if (!inside_entry_file (thisframe->pc))
121 return (read_memory_integer (get_frame_base (thisframe), PTR_SIZE));
126 /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
127 is not the address of a valid instruction, the address of the next
128 instruction beyond ADDR otherwise. *PWORD1 receives the first word
129 of the instruction. */
132 NEXT_PROLOGUE_INSN (CORE_ADDR addr, CORE_ADDR lim, char *pword1)
136 read_memory (addr, pword1, 1);
137 read_memory (addr, pword1 + 1, 1);
143 /* Examine the prologue of a function. `ip' points to the first
144 instruction. `limit' is the limit of the prologue (e.g. the addr
145 of the first linenumber, or perhaps the program counter if we're
146 stepping through). `frame_sp' is the stack pointer value in use in
147 this frame. `fsr' is a pointer to a frame_saved_regs structure
148 into which we put info about the registers saved by this frame.
149 `fi' is a struct frame_info pointer; we fill in various fields in
150 it to reflect the offsets of the arg pointer and the locals
153 /* Return the saved PC from this frame. */
156 frame_saved_pc (struct frame_info *frame)
158 return read_memory_integer (get_frame_base (frame) + 2, PTR_SIZE);
162 h8500_pop_frame (void)
165 struct frame_saved_regs fsr;
166 struct frame_info *frame = get_current_frame ();
168 deprecated_get_frame_saved_regs (frame, &fsr);
170 for (regnum = 0; regnum < 8; regnum++)
172 if (fsr.regs[regnum])
173 write_register (regnum, read_memory_short (fsr.regs[regnum]));
175 flush_cached_frames ();
180 h8500_print_register_hook (int regno)
182 if (regno == CCR_REGNUM)
190 frame_register_read (deprecated_selected_frame, regno, b);
192 printf_unfiltered ("\t");
193 printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
198 printf_unfiltered ("N-%d ", N);
199 printf_unfiltered ("Z-%d ", Z);
200 printf_unfiltered ("V-%d ", V);
201 printf_unfiltered ("C-%d ", C);
203 printf_unfiltered ("u> ");
205 printf_unfiltered ("u<= ");
207 printf_unfiltered ("u>= ");
209 printf_unfiltered ("u< ");
211 printf_unfiltered ("!= ");
213 printf_unfiltered ("== ");
215 printf_unfiltered (">= ");
217 printf_unfiltered ("< ");
218 if ((Z | (N ^ V)) == 0)
219 printf_unfiltered ("> ");
220 if ((Z | (N ^ V)) == 1)
221 printf_unfiltered ("<= ");
226 h8500_print_registers_info (struct gdbarch *gdbarch,
227 struct ui_file *file,
228 struct frame_info *frame,
229 int regnum, int print_all)
232 const int numregs = NUM_REGS + NUM_PSEUDO_REGS;
233 char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE);
234 char *virtual_buffer = alloca (MAX_REGISTER_VIRTUAL_SIZE);
236 for (i = 0; i < numregs; i++)
238 /* Decide between printing all regs, non-float / vector regs, or
244 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (i)) == TYPE_CODE_FLT)
246 if (TYPE_VECTOR (REGISTER_VIRTUAL_TYPE (i)))
256 /* If the register name is empty, it is undefined for this
257 processor, so don't display anything. */
258 if (REGISTER_NAME (i) == NULL || *(REGISTER_NAME (i)) == '\0')
261 fputs_filtered (REGISTER_NAME (i), file);
262 print_spaces_filtered (15 - strlen (REGISTER_NAME (i)), file);
264 /* Get the data in raw format. */
265 if (! frame_register_read (frame, i, raw_buffer))
267 fprintf_filtered (file, "*value not available*\n");
271 /* FIXME: cagney/2002-08-03: This code shouldn't be necessary.
272 The function frame_register_read() should have returned the
273 pre-cooked register so no conversion is necessary. */
274 /* Convert raw data to virtual format if necessary. */
275 if (REGISTER_CONVERTIBLE (i))
277 REGISTER_CONVERT_TO_VIRTUAL (i, REGISTER_VIRTUAL_TYPE (i),
278 raw_buffer, virtual_buffer);
282 memcpy (virtual_buffer, raw_buffer,
283 REGISTER_VIRTUAL_SIZE (i));
286 /* If virtual format is floating, print it that way, and in raw
288 if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (i)) == TYPE_CODE_FLT)
292 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0,
293 file, 0, 1, 0, Val_pretty_default);
295 fprintf_filtered (file, "\t(raw 0x");
296 for (j = 0; j < REGISTER_RAW_SIZE (i); j++)
299 if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
302 idx = REGISTER_RAW_SIZE (i) - 1 - j;
303 fprintf_filtered (file, "%02x", (unsigned char) raw_buffer[idx]);
305 fprintf_filtered (file, ")");
309 /* Print the register in hex. */
310 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0,
311 file, 'x', 1, 0, Val_pretty_default);
312 /* If not a vector register, print it also according to its
314 if (TYPE_VECTOR (REGISTER_VIRTUAL_TYPE (i)) == 0)
316 fprintf_filtered (file, "\t");
317 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0,
318 file, 0, 1, 0, Val_pretty_default);
322 /* Some h8500 specific info. */
323 h8500_print_register_hook (i);
325 fprintf_filtered (file, "\n");
330 h8500_do_registers_info (int regnum, int all)
332 h8500_print_registers_info (current_gdbarch, gdb_stdout, deprecated_selected_frame,
337 h8500_register_size (int regno)
368 internal_error (__FILE__, __LINE__, "failed internal consistency check");
373 h8500_register_virtual_type (int regno)
381 return builtin_type_unsigned_char;
391 return builtin_type_unsigned_short;
401 return builtin_type_unsigned_long;
403 internal_error (__FILE__, __LINE__, "failed internal consistency check");
407 /* Put here the code to store, into a struct frame_saved_regs,
408 the addresses of the saved registers of frame described by FRAME_INFO.
409 This includes special registers such as pc and fp saved in special
410 ways in the stack frame. sp is even more special:
411 the address we return for it IS the sp for the next frame. */
414 frame_find_saved_regs (struct frame_info *frame_info,
415 struct frame_saved_regs *frame_saved_regs)
418 register int regmask;
419 register CORE_ADDR next_addr;
420 register CORE_ADDR pc;
421 unsigned char thebyte;
423 memset (frame_saved_regs, '\0', sizeof *frame_saved_regs);
425 if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4
426 && (frame_info)->pc <= (frame_info)->frame)
428 next_addr = (frame_info)->frame;
429 pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4;
433 pc = get_pc_function_start ((frame_info)->pc);
434 /* Verify we have a link a6 instruction next;
435 if not we lose. If we win, find the address above the saved
436 regs using the amount of storage from the link instruction.
439 thebyte = read_memory_integer (pc, 1);
441 next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 2), pc += 2;
442 else if (0x17 == thebyte)
443 next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 1), pc += 1;
448 /* If have an add:g.waddal #-n, sp next, adjust next_addr. */
449 if ((0x0c0177777 & read_memory_integer (pc, 2)) == 0157774)
450 next_addr += read_memory_integer (pc += 2, 4), pc += 4;
454 thebyte = read_memory_integer (pc, 1);
459 regmask = read_memory_integer (pc, 1);
461 for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)
465 (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2;
468 thebyte = read_memory_integer (pc, 1);
470 /* Maybe got a load of pushes */
471 while (thebyte == 0xbf)
474 regnum = read_memory_integer (pc, 1) & 0x7;
476 (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2;
477 thebyte = read_memory_integer (pc, 1);
482 /* Remember the address of the frame pointer */
483 (frame_saved_regs)->regs[FP_REGNUM] = (frame_info)->frame;
485 /* This is where the old sp is hidden */
486 (frame_saved_regs)->regs[SP_REGNUM] = (frame_info)->frame;
488 /* And the PC - remember the pushed FP is always two bytes long */
489 (frame_saved_regs)->regs[PC_REGNUM] = (frame_info)->frame + 2;
493 saved_pc_after_call (void)
496 int a = read_register (SP_REGNUM);
498 x = read_memory_integer (a, code_size);
501 /* Stick current code segement onto top */
503 x |= read_register (SEG_C_REGNUM) << 16;
510 h8500_set_pointer_size (int newsize)
512 static int oldsize = 0;
514 if (oldsize != newsize)
516 printf_unfiltered ("pointer size set to %d bits\n", newsize);
526 _initialize_gdbtypes ();
531 big_command (char *arg, int from_tty)
533 h8500_set_pointer_size (32);
539 medium_command (char *arg, int from_tty)
541 h8500_set_pointer_size (32);
547 compact_command (char *arg, int from_tty)
549 h8500_set_pointer_size (32);
555 small_command (char *arg, int from_tty)
557 h8500_set_pointer_size (16);
562 static struct cmd_list_element *setmemorylist;
565 set_memory (char *args, int from_tty)
567 printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n");
568 help_list (setmemorylist, "set memory ", -1, gdb_stdout);
571 /* See if variable name is ppc or pr[0-7] */
574 h8500_is_trapped_internalvar (char *name)
579 if (strcmp (name + 1, "pc") == 0)
585 && name[3] == '\000')
592 h8500_value_of_trapped_internalvar (struct internalvar *var)
595 unsigned char regbuf[4];
596 int page_regnum, regnum;
598 regnum = var->name[2] == 'c' ? PC_REGNUM : var->name[2] - '0';
600 switch (var->name[2])
603 page_regnum = SEG_C_REGNUM;
609 page_regnum = SEG_D_REGNUM;
613 page_regnum = SEG_E_REGNUM;
617 page_regnum = SEG_T_REGNUM;
621 get_saved_register (regbuf, NULL, NULL, deprecated_selected_frame, page_regnum, NULL);
622 regval = regbuf[0] << 16;
624 get_saved_register (regbuf, NULL, NULL, deprecated_selected_frame, regnum, NULL);
625 regval |= regbuf[0] << 8 | regbuf[1]; /* XXX host/target byte order */
627 xfree (var->value); /* Free up old value */
629 var->value = value_from_longest (builtin_type_unsigned_long, regval);
630 release_value (var->value); /* Unchain new value */
632 VALUE_LVAL (var->value) = lval_internalvar;
633 VALUE_INTERNALVAR (var->value) = var;
638 h8500_set_trapped_internalvar (struct internalvar *var, struct value *newval,
639 int bitpos, int bitsize, int offset)
641 char *page_regnum, *regnum;
642 char expression[100];
645 enum type_code newval_type_code;
647 type = check_typedef (VALUE_TYPE (newval));
648 newval_type_code = TYPE_CODE (type);
650 if ((newval_type_code != TYPE_CODE_INT
651 && newval_type_code != TYPE_CODE_PTR)
652 || TYPE_LENGTH (type) != sizeof (new_regval))
653 error ("Illegal type (%s) for assignment to $%s\n",
654 TYPE_NAME (VALUE_TYPE (newval)), var->name);
656 new_regval = *(long *) VALUE_CONTENTS_RAW (newval);
658 regnum = var->name + 1;
660 switch (var->name[2])
681 sprintf (expression, "$%s=%d", page_regnum, new_regval >> 16);
682 parse_and_eval (expression);
684 sprintf (expression, "$%s=%d", regnum, new_regval & 0xffff);
685 parse_and_eval (expression);
691 return read_register (PR7_REGNUM);
695 h8500_write_sp (CORE_ADDR v)
697 write_register (PR7_REGNUM, v);
701 h8500_read_pc (ptid_t ptid)
703 return read_register (PC_REGNUM);
707 h8500_write_pc (CORE_ADDR v, ptid_t ptid)
709 write_register (PC_REGNUM, v);
715 return read_register (PR6_REGNUM);
719 _initialize_h8500_tdep (void)
721 tm_print_insn = print_insn_h8500;
723 add_prefix_cmd ("memory", no_class, set_memory,
724 "set the memory model", &setmemorylist, "set memory ", 0,
727 add_cmd ("small", class_support, small_command,
728 "Set small memory model. (16 bit code, 16 bit data)", &setmemorylist);
730 add_cmd ("big", class_support, big_command,
731 "Set big memory model. (32 bit code, 32 bit data)", &setmemorylist);
733 add_cmd ("medium", class_support, medium_command,
734 "Set medium memory model. (32 bit code, 16 bit data)", &setmemorylist);
736 add_cmd ("compact", class_support, compact_command,
737 "Set compact memory model. (16 bit code, 32 bit data)", &setmemorylist);