gdb/config/z8k/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 #define IEEE_FLOAT 1
  21
  22 #undef TARGET_INT_BIT
  23 #undef TARGET_LONG_BIT
  24 #undef TARGET_SHORT_BIT
  25 #undef TARGET_PTR_BIT
  26
  27 #define TARGET_SHORT_BIT 16
  28 #define TARGET_INT_BIT 16
  29 #define TARGET_LONG_BIT 32
  30 #define TARGET_PTR_BIT (BIG ? 32: 16)
  31
  32 /* Define the bit, byte, and word ordering of the machine.  */
  33 #define TARGET_BYTE_ORDER BIG_ENDIAN
  34
  35 /* Offset from address of function to start of its code.
  36    Zero on most machines.  */
  37
  38 #define FUNCTION_START_OFFSET 0
  39
  40 /* Advance PC across any function entry prologue instructions
  41    to reach some "real" code.  */
  42
  43 #define SKIP_PROLOGUE(ip)   {(ip) = z8k_skip_prologue(ip);}
  44 extern CORE_ADDR mz8k_skip_prologue PARAMS ((CORE_ADDR ip));
  45
  46
  47 /* Immediately after a function call, return the saved pc.
  48    Can't always go through the frames for this because on some machines
  49    the new frame is not set up until the new function executes
  50    some instructions.  */
  51
  52 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call(frame)
  53
  54 /* Stack grows downward.  */
  55
  56 #define INNER_THAN <
  57
  58 /* Sequence of bytes for breakpoint instruction. */
  59
  60 #define BREAKPOINT {0x36,0x00}
  61
  62 /* If your kernel resets the pc after the trap happens you may need to
  63    define this before including this file.  */
  64
  65 #define DECR_PC_AFTER_BREAK 0
  66
  67 /* Nonzero if instruction at PC is a return instruction.  */
  68 /* Allow any of the return instructions, including a trapv and a return
  69    from interupt.  */
  70
  71 #define ABOUT_TO_RETURN(pc) about_to_return(pc)
  72
  73 /* Return 1 if P points to an invalid floating point value.  */
  74
  75 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
  76
  77 /* Say how long registers are.  */
  78
  79 #define REGISTER_TYPE unsigned int
  80
  81 #define NUM_REGS        23   /* 16 registers + 1 ccr + 1 pc + 3 debug
  82                                 regs + fake fp + fake sp*/
  83 #define REGISTER_BYTES  (NUM_REGS *4)
  84
  85 /* Index within `registers' of the first byte of the space for
  86    register N.  */
  87
  88 #define REGISTER_BYTE(N)  ((N)*4)
  89
  90 /* Number of bytes of storage in the actual machine representation
  91    for register N.  On the z8k, all but the pc are 2 bytes, but we
  92    keep them all as 4 bytes and trim them on I/O */
  93
  94
  95 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
  96
  97 /* Number of bytes of storage in the program's representation
  98    for register N.  */
  99
 100 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 101
 102 /* Largest value REGISTER_RAW_SIZE can have.  */
 103
 104 #define MAX_REGISTER_RAW_SIZE 4
 105
 106 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 107
 108 #define MAX_REGISTER_VIRTUAL_SIZE 4
 109
 110 /* Return the GDB type object for the "standard" data type
 111    of data in register N.  */
 112
 113 #define REGISTER_VIRTUAL_TYPE(N) \
 114  (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
 115
 116 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y)*/
 117 /* Initializer for an array of names of registers.
 118    Entries beyond the first NUM_REGS are ignored.  */
 119
 120 #define REGISTER_NAMES  \
 121  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 122   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
 123   "ccr", "pc", "cycles","insts","time","fp","sp"}
 124
 125 /* Register numbers of various important registers.
 126    Note that some of these values are "real" register numbers,
 127    and correspond to the general registers of the machine,
 128    and some are "phony" register numbers which are too large
 129    to be actual register numbers as far as the user is concerned
 130    but do serve to get the desired values when passed to read_register.  */
 131
 132 #define CCR_REGNUM      16      /* Contains processor status */
 133 #define PC_REGNUM       17      /* Contains program counter */
 134 #define CYCLES_REGNUM   18
 135 #define INSTS_REGNUM    19
 136 #define TIME_REGNUM     20
 137 #define FP_REGNUM       21      /* Contains fp, whatever memory model */
 138 #define SP_REGNUM       22      /* Conatins sp, whatever memory model */
 139
 140
 141
 142 #define PTR_SIZE (BIG ? 4: 2)
 143 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 144
 145 /* Store the address of the place in which to copy the structure the
 146    subroutine will return.  This is called from call_function. */
 147
 148 #define STORE_STRUCT_RETURN(ADDR, SP) abort();
 149
 150 /* Extract from an array REGBUF containing the (raw) register state
 151    a function return value of type TYPE, and copy that, in virtual format,
 152    into VALBUF.  This is assuming that floating point values are returned
 153    as doubles in d0/d1.  */
 154
 155
 156 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 157   memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
 158
 159 /* Write into appropriate registers a function return value
 160    of type TYPE, given in virtual format. */
 161
 162 #define STORE_RETURN_VALUE(TYPE,VALBUF) abort();
 163
 164 /* Extract from an array REGBUF containing the (raw) register state
 165    the address in which a function should return its structure value,
 166    as a CORE_ADDR (or an expression that can be used as one).  */
 167
 168 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 169 \f
 170 /* Describe the pointer in each stack frame to the previous stack frame
 171    (its caller).  */
 172
 173 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 174    chain-pointer.
 175    In the case of the Z8000, the frame's nominal address
 176    is the address of a ptr sized byte word containing the calling
 177    frame's address.  */
 178
 179 #define FRAME_CHAIN(thisframe) frame_chain(thisframe);
 180
 181
 182
 183 /* Define other aspects of the stack frame.  */
 184
 185 /* A macro that tells us whether the function invocation represented
 186    by FI does not have a frame on the stack associated with it.  If it
 187    does not, FRAMELESS is set to 1, else 0.  */
 188 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 189   (FRAMELESS) = frameless_look_for_prologue(FI)
 190
 191 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 192
 193 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 194
 195 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 196
 197 /* Set VAL to the number of args passed to frame described by FI.
 198    Can set VAL to -1, meaning no way to tell.  */
 199
 200 /* We can't tell how many args there are
 201    now that the C compiler delays popping them.  */
 202 #if !defined (FRAME_NUM_ARGS)
 203 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 204 #endif
 205
 206 /* Return number of bytes at start of arglist that are not really args.  */
 207
 208 #define FRAME_ARGS_SKIP 8
 209
 210
 211 \f
 212 /* Things needed for making the inferior call functions.
 213    It seems like every m68k based machine has almost identical definitions
 214    in the individual machine's configuration files.  Most other cpu types
 215    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 216    for most configurations.  The m68k family should be able to do this as
 217    well.  These macros can still be overridden when necessary.  */
 218
 219 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 220    by gdb itself:
 221
 222         fmovemx fp0-fp7,sp@-                    0xf227 0xe0ff
 223         moveml d0-a5,sp@-                       0x48e7 0xfffc
 224         clrw sp@-                               0x4267
 225         movew ccr,sp@-                          0x42e7
 226
 227         /..* The arguments are pushed at this point by GDB;
 228         no code is needed in the dummy for this.
 229         The CALL_DUMMY_START_OFFSET gives the position of
 230         the following jsr instruction.  *../
 231
 232         jsr @#0x32323232                        0x4eb9 0x3232 0x3232
 233         addal #0x69696969,sp                    0xdffc 0x6969 0x6969
 234         trap #<your BPT_VECTOR number here>     0x4e4?
 235         nop                                     0x4e71
 236
 237    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 238    We actually start executing at the jsr, since the pushing of the
 239    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 240    the arguments for the function called by the jsr would be pushed
 241    between the moveml and the jsr, and we could allow it to execute through.
 242    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 243    done, and we cannot allow the moveml to push the registers again lest
 244    they be taken for the arguments.  */
 245
 246
 247 #define CALL_DUMMY { 0 }
 248 #define CALL_DUMMY_LENGTH 24            /* Size of CALL_DUMMY */
 249 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction*/
 250
 251
 252 /* Insert the specified number of args and function address
 253    into a call sequence of the above form stored at DUMMYNAME.
 254    We use the BFD routines to store a big-endian value of known size.  */
 255
 256 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 257 { bfd_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
 258   bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
 259
 260 /* Push an empty stack frame, to record the current PC, etc.  */
 261
 262 #define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }
 263
 264 extern void z8k_push_dummy_frame PARAMS ((void));
 265
 266 extern void z8k_pop_frame PARAMS ((void));
 267
 268 /* Discard from the stack the innermost frame, restoring all registers.  */
 269
 270 #define POP_FRAME               { z8k_pop_frame (); }
 271
 272 /* Offset from SP to first arg on stack at first instruction of a function */
 273
 274 #define SP_ARG0 (1 * 4)
 275
 276 #define ADDR_BITS_REMOVE(x) addr_bits_remove(x)
 277 int z8001_mode;
 278 #define BIG (z8001_mode)
 279
 280 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 281
 282 #define NO_STD_REGS
 283
 284 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 285
 286
 287 #define INIT_EXTRA_SYMTAB_INFO \
 288   z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);