gdb/tm-z8k.h

   1 /* Parameters for execution on a z8000 series machine.
   2    Copyright 1992 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   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.
  10
  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.
  15
  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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21
  22 #define IEEE_FLOAT 1
  23
  24 #undef TARGET_INT_BIT
  25 #undef TARGET_LONG_BIT
  26 #undef TARGET_SHORT_BIT
  27 #undef TARGET_PTR_BIT
  28
  29 #define TARGET_SHORT_BIT 16
  30 #define TARGET_INT_BIT 16
  31 #define TARGET_LONG_BIT 32
  32 #define TARGET_PTR_BIT (BIG ? 32: 16)
  33
  34 /* Define the bit, byte, and word ordering of the machine.  */
  35 #define TARGET_BYTE_ORDER BIG_ENDIAN
  36
  37 /* Offset from address of function to start of its code.
  38    Zero on most machines.  */
  39
  40 #define FUNCTION_START_OFFSET 0
  41
  42 /* Advance PC across any function entry prologue instructions
  43    to reach some "real" code.  */
  44
  45 #define SKIP_PROLOGUE(ip)   {(ip) = z8k_skip_prologue(ip);}
  46 extern CORE_ADDR mz8k_skip_prologue PARAMS ((CORE_ADDR ip));
  47
  48
  49 /* Immediately after a function call, return the saved pc.
  50    Can't always go through the frames for this because on some machines
  51    the new frame is not set up until the new function executes
  52    some instructions.  */
  53
  54 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call(frame)
  55
  56 /* Stack grows downward.  */
  57
  58 #define INNER_THAN <
  59
  60 /* Sequence of bytes for breakpoint instruction. */
  61
  62 #define BREAKPOINT {0x36,0x00}
  63
  64 /* If your kernel resets the pc after the trap happens you may need to
  65    define this before including this file.  */
  66
  67 #define DECR_PC_AFTER_BREAK 0
  68
  69 /* Nonzero if instruction at PC is a return instruction.  */
  70 /* Allow any of the return instructions, including a trapv and a return
  71    from interupt.  */
  72
  73 #define ABOUT_TO_RETURN(pc) about_to_return(pc)
  74
  75 /* Return 1 if P points to an invalid floating point value.  */
  76
  77 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
  78
  79 /* Say how long registers are.  */
  80
  81 #define REGISTER_TYPE unsigned int
  82
  83 #define NUM_REGS        23   /* 16 registers + 1 ccr + 1 pc + 3 debug
  84                                 regs + fake fp + fake sp*/
  85 #define REGISTER_BYTES  (NUM_REGS *4)
  86
  87 /* Index within `registers' of the first byte of the space for
  88    register N.  */
  89
  90 #define REGISTER_BYTE(N)  ((N)*4)
  91
  92 /* Number of bytes of storage in the actual machine representation
  93    for register N.  On the z8k, all but the pc are 2 bytes, but we
  94    keep them all as 4 bytes and trim them on I/O */
  95
  96
  97 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
  98
  99 /* Number of bytes of storage in the program's representation
 100    for register N.  */
 101
 102 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 103
 104 /* Largest value REGISTER_RAW_SIZE can have.  */
 105
 106 #define MAX_REGISTER_RAW_SIZE 4
 107
 108 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 109
 110 #define MAX_REGISTER_VIRTUAL_SIZE 4
 111
 112 /* Nonzero if register N requires conversion
 113    from raw format to virtual format.  */
 114
 115 #define REGISTER_CONVERTIBLE(N) 0
 116
 117 /* Convert data from raw format for register REGNUM
 118    to virtual format for register REGNUM.  */
 119
 120 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 121  register_convert_to_virtual(REGNUM, FROM, TO)
 122
 123 /* Convert data from virtual format for register REGNUM
 124    to raw format for register REGNUM.  */
 125
 126 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 127  register_convert_to_raw(REGNUM, FROM, TO)
 128
 129 /* Return the GDB type object for the "standard" data type
 130    of data in register N.  */
 131
 132 #define REGISTER_VIRTUAL_TYPE(N) \
 133  (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
 134
 135 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y)*/
 136 /* Initializer for an array of names of registers.
 137    Entries beyond the first NUM_REGS are ignored.  */
 138
 139 #define REGISTER_NAMES  \
 140  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 141   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
 142   "ccr", "pc", "cycles","insts","time","fp","sp"}
 143
 144 /* Register numbers of various important registers.
 145    Note that some of these values are "real" register numbers,
 146    and correspond to the general registers of the machine,
 147    and some are "phony" register numbers which are too large
 148    to be actual register numbers as far as the user is concerned
 149    but do serve to get the desired values when passed to read_register.  */
 150
 151 #define CCR_REGNUM 16           /* Contains processor status */
 152 #define PC_REGNUM 17            /* Contains program counter */
 153 #define CYCLES_REGNUM 18
 154 #define INSTS_REGNUM 19
 155 #define TIME_REGNUM 20
 156 #define FP_REGNUM 21            /* Contains fp, whatever memory model */
 157 #define SP_REGNUM 22            /* Conatins sp, whatever memory model */
 158
 159
 160
 161
 162
 163
 164
 165 #define PTR_SIZE (BIG ? 4: 2)
 166 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 167 /* Store the address of the place in which to copy the structure the
 168    subroutine will return.  This is called from call_function. */
 169
 170 #define STORE_STRUCT_RETURN(ADDR, SP) store_struct_return(ADDR,SP)
 171
 172 /* Extract from an array REGBUF containing the (raw) register state
 173    a function return value of type TYPE, and copy that, in virtual format,
 174    into VALBUF.  This is assuming that floating point values are returned
 175    as doubles in d0/d1.  */
 176
 177
 178 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 179  extract_return_value(TYPE,REGBUF,VALBUF)
 180
 181 /* Write into appropriate registers a function return value
 182    of type TYPE, given in virtual format.  Assumes floats are passed
 183    in d0/d1.  */
 184
 185 #define STORE_RETURN_VALUE(TYPE,VALBUF) store_return_value(TYPE,VALBUF);
 186
 187 /* Extract from an array REGBUF containing the (raw) register state
 188    the address in which a function should return its structure value,
 189    as a CORE_ADDR (or an expression that can be used as one).  */
 190
 191 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 192 \f
 193 /* Describe the pointer in each stack frame to the previous stack frame
 194    (its caller).  */
 195
 196 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 197    chain-pointer.
 198    In the case of the 68000, the frame's nominal address
 199    is the address of a 4-byte word containing the calling frame's address.  */
 200
 201 #define FRAME_CHAIN(thisframe)  frame_chain(thisframe)
 202
 203 /* Define other aspects of the stack frame.  */
 204
 205 /* A macro that tells us whether the function invocation represented
 206    by FI does not have a frame on the stack associated with it.  If it
 207    does not, FRAMELESS is set to 1, else 0.  */
 208 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 209   (FRAMELESS) = frameless_look_for_prologue(FI)
 210
 211 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 212
 213 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 214
 215 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 216
 217 /* Set VAL to the number of args passed to frame described by FI.
 218    Can set VAL to -1, meaning no way to tell.  */
 219
 220 /* We can't tell how many args there are
 221    now that the C compiler delays popping them.  */
 222 #if !defined (FRAME_NUM_ARGS)
 223 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 224 #endif
 225
 226 /* Return number of bytes at start of arglist that are not really args.  */
 227
 228 #define FRAME_ARGS_SKIP 8
 229
 230
 231 \f
 232 /* Things needed for making the inferior call functions.
 233    It seems like every m68k based machine has almost identical definitions
 234    in the individual machine's configuration files.  Most other cpu types
 235    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 236    for most configurations.  The m68k family should be able to do this as
 237    well.  These macros can still be overridden when necessary.  */
 238
 239 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 240    by gdb itself:
 241
 242         fmovemx fp0-fp7,sp@-                    0xf227 0xe0ff
 243         moveml d0-a5,sp@-                       0x48e7 0xfffc
 244         clrw sp@-                               0x4267
 245         movew ccr,sp@-                          0x42e7
 246
 247         /..* The arguments are pushed at this point by GDB;
 248         no code is needed in the dummy for this.
 249         The CALL_DUMMY_START_OFFSET gives the position of
 250         the following jsr instruction.  *../
 251
 252         jsr @#0x32323232                        0x4eb9 0x3232 0x3232
 253         addal #0x69696969,sp                    0xdffc 0x6969 0x6969
 254         trap #<your BPT_VECTOR number here>     0x4e4?
 255         nop                                     0x4e71
 256
 257    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 258    We actually start executing at the jsr, since the pushing of the
 259    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 260    the arguments for the function called by the jsr would be pushed
 261    between the moveml and the jsr, and we could allow it to execute through.
 262    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 263    done, and we cannot allow the moveml to push the registers again lest
 264    they be taken for the arguments.  */
 265
 266
 267 #define CALL_DUMMY { 0 }
 268 #define CALL_DUMMY_LENGTH 24            /* Size of CALL_DUMMY */
 269 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction*/
 270
 271
 272 /* Insert the specified number of args and function address
 273    into a call sequence of the above form stored at DUMMYNAME.
 274    We use the BFD routines to store a big-endian value of known size.  */
 275
 276 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 277 { _do_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
 278   _do_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
 279
 280 /* Push an empty stack frame, to record the current PC, etc.  */
 281
 282 #define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }
 283
 284 extern void z8k_push_dummy_frame PARAMS ((void));
 285
 286 extern void z8k_pop_frame PARAMS ((void));
 287
 288 /* Discard from the stack the innermost frame, restoring all registers.  */
 289
 290 #define POP_FRAME               { z8k_pop_frame (); }
 291
 292 /* Offset from SP to first arg on stack at first instruction of a function */
 293
 294 #define SP_ARG0 (1 * 4)
 295
 296 #define ADDR_BITS_REMOVE(x) addr_bits_remove(x)
 297 #define ADDR_BITS_SET(x) addr_bits_set(x)
 298 int z8001_mode;
 299 #define BIG (z8001_mode)
 300
 301 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 302
 303 #define NO_STD_REGS
 304
 305
 306
 307 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 308
 309
 310 /* Define this if the C compiler puts an underscore at the front
 311    of external names before giving them to the linker.  */
 312
 313 #define NAMES_HAVE_UNDERSCORE
 314
 315 #define ADDITIONAL_OPTIONS {"z8001",no_argument,&z8001_mode, 1},