gdb/tm-z8k.h

   1 /* Parameters for execution on a z8000 series machine.
   2    Copyright 1992,1993 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 #define PTR_SIZE (BIG ? 4: 2)
 162 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 163
 164 /* Store the address of the place in which to copy the structure the
 165    subroutine will return.  This is called from call_function. */
 166
 167 #define STORE_STRUCT_RETURN(ADDR, SP) abort();
 168
 169 /* Extract from an array REGBUF containing the (raw) register state
 170    a function return value of type TYPE, and copy that, in virtual format,
 171    into VALBUF.  This is assuming that floating point values are returned
 172    as doubles in d0/d1.  */
 173
 174
 175 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 176   bcopy(REGBUF + REGISTER_BYTE(2), VALBUF, TYPE_LENGTH(TYPE));
 177
 178 /* Write into appropriate registers a function return value
 179    of type TYPE, given in virtual format. */
 180
 181 #define STORE_RETURN_VALUE(TYPE,VALBUF) abort();
 182
 183 /* Extract from an array REGBUF containing the (raw) register state
 184    the address in which a function should return its structure value,
 185    as a CORE_ADDR (or an expression that can be used as one).  */
 186
 187 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 188 \f
 189 /* Describe the pointer in each stack frame to the previous stack frame
 190    (its caller).  */
 191
 192 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 193    chain-pointer.
 194    In the case of the Z8000, the frame's nominal address
 195    is the address of a ptr sized byte word containing the calling
 196    frame's address.  */
 197
 198 #define FRAME_CHAIN(thisframe) frame_chain(thisframe);
 199
 200
 201
 202 /* Define other aspects of the stack frame.  */
 203
 204 /* A macro that tells us whether the function invocation represented
 205    by FI does not have a frame on the stack associated with it.  If it
 206    does not, FRAMELESS is set to 1, else 0.  */
 207 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 208   (FRAMELESS) = frameless_look_for_prologue(FI)
 209
 210 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 211
 212 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 213
 214 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 215
 216 /* Set VAL to the number of args passed to frame described by FI.
 217    Can set VAL to -1, meaning no way to tell.  */
 218
 219 /* We can't tell how many args there are
 220    now that the C compiler delays popping them.  */
 221 #if !defined (FRAME_NUM_ARGS)
 222 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 223 #endif
 224
 225 /* Return number of bytes at start of arglist that are not really args.  */
 226
 227 #define FRAME_ARGS_SKIP 8
 228
 229
 230 \f
 231 /* Things needed for making the inferior call functions.
 232    It seems like every m68k based machine has almost identical definitions
 233    in the individual machine's configuration files.  Most other cpu types
 234    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 235    for most configurations.  The m68k family should be able to do this as
 236    well.  These macros can still be overridden when necessary.  */
 237
 238 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 239    by gdb itself:
 240
 241         fmovemx fp0-fp7,sp@-                    0xf227 0xe0ff
 242         moveml d0-a5,sp@-                       0x48e7 0xfffc
 243         clrw sp@-                               0x4267
 244         movew ccr,sp@-                          0x42e7
 245
 246         /..* The arguments are pushed at this point by GDB;
 247         no code is needed in the dummy for this.
 248         The CALL_DUMMY_START_OFFSET gives the position of
 249         the following jsr instruction.  *../
 250
 251         jsr @#0x32323232                        0x4eb9 0x3232 0x3232
 252         addal #0x69696969,sp                    0xdffc 0x6969 0x6969
 253         trap #<your BPT_VECTOR number here>     0x4e4?
 254         nop                                     0x4e71
 255
 256    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 257    We actually start executing at the jsr, since the pushing of the
 258    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 259    the arguments for the function called by the jsr would be pushed
 260    between the moveml and the jsr, and we could allow it to execute through.
 261    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 262    done, and we cannot allow the moveml to push the registers again lest
 263    they be taken for the arguments.  */
 264
 265
 266 #define CALL_DUMMY { 0 }
 267 #define CALL_DUMMY_LENGTH 24            /* Size of CALL_DUMMY */
 268 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction*/
 269
 270
 271 /* Insert the specified number of args and function address
 272    into a call sequence of the above form stored at DUMMYNAME.
 273    We use the BFD routines to store a big-endian value of known size.  */
 274
 275 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 276 { _do_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
 277   _do_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
 278
 279 /* Push an empty stack frame, to record the current PC, etc.  */
 280
 281 #define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }
 282
 283 extern void z8k_push_dummy_frame PARAMS ((void));
 284
 285 extern void z8k_pop_frame PARAMS ((void));
 286
 287 /* Discard from the stack the innermost frame, restoring all registers.  */
 288
 289 #define POP_FRAME               { z8k_pop_frame (); }
 290
 291 /* Offset from SP to first arg on stack at first instruction of a function */
 292
 293 #define SP_ARG0 (1 * 4)
 294
 295 #define ADDR_BITS_REMOVE(x) addr_bits_remove(x)
 296 #define ADDR_BITS_SET(x) addr_bits_set(x)
 297 int z8001_mode;
 298 #define BIG (z8001_mode)
 299
 300 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 301
 302 #define NO_STD_REGS
 303
 304 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 305
 306
 307 /* Define this if the C compiler puts an underscore at the front
 308    of external names before giving them to the linker.  */
 309
 310 #define NAMES_HAVE_UNDERSCORE
 311
 312
 313 #define INIT_EXTRA_SYMTAB_INFO \
 314   z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);