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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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(lhs,rhs) ((lhs) < (rhs))
  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 /* Say how long registers are.  */
  68
  69 #define REGISTER_TYPE unsigned int
  70
  71 #define NUM_REGS        23   /* 16 registers + 1 ccr + 1 pc + 3 debug
  72                                 regs + fake fp + fake sp*/
  73 #define REGISTER_BYTES  (NUM_REGS *4)
  74
  75 /* Index within `registers' of the first byte of the space for
  76    register N.  */
  77
  78 #define REGISTER_BYTE(N)  ((N)*4)
  79
  80 /* Number of bytes of storage in the actual machine representation
  81    for register N.  On the z8k, all but the pc are 2 bytes, but we
  82    keep them all as 4 bytes and trim them on I/O */
  83
  84
  85 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
  86
  87 /* Number of bytes of storage in the program's representation
  88    for register N.  */
  89
  90 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
  91
  92 /* Largest value REGISTER_RAW_SIZE can have.  */
  93
  94 #define MAX_REGISTER_RAW_SIZE 4
  95
  96 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
  97
  98 #define MAX_REGISTER_VIRTUAL_SIZE 4
  99
 100 /* Return the GDB type object for the "standard" data type
 101    of data in register N.  */
 102
 103 #define REGISTER_VIRTUAL_TYPE(N) \
 104  (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
 105
 106 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y)*/
 107 /* Initializer for an array of names of registers.
 108    Entries beyond the first NUM_REGS are ignored.  */
 109
 110 #define REGISTER_NAMES  \
 111  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 112   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
 113   "ccr", "pc", "cycles","insts","time","fp","sp"}
 114
 115 /* Register numbers of various important registers.
 116    Note that some of these values are "real" register numbers,
 117    and correspond to the general registers of the machine,
 118    and some are "phony" register numbers which are too large
 119    to be actual register numbers as far as the user is concerned
 120    but do serve to get the desired values when passed to read_register.  */
 121
 122 #define CCR_REGNUM      16      /* Contains processor status */
 123 #define PC_REGNUM       17      /* Contains program counter */
 124 #define CYCLES_REGNUM   18
 125 #define INSTS_REGNUM    19
 126 #define TIME_REGNUM     20
 127 #define FP_REGNUM       21      /* Contains fp, whatever memory model */
 128 #define SP_REGNUM       22      /* Conatins sp, whatever memory model */
 129
 130
 131
 132 #define PTR_SIZE (BIG ? 4: 2)
 133 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 134
 135 /* Store the address of the place in which to copy the structure the
 136    subroutine will return.  This is called from call_function. */
 137
 138 #define STORE_STRUCT_RETURN(ADDR, SP) abort();
 139
 140 /* Extract from an array REGBUF containing the (raw) register state
 141    a function return value of type TYPE, and copy that, in virtual format,
 142    into VALBUF.  This is assuming that floating point values are returned
 143    as doubles in d0/d1.  */
 144
 145
 146 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 147   memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
 148
 149 /* Write into appropriate registers a function return value
 150    of type TYPE, given in virtual format. */
 151
 152 #define STORE_RETURN_VALUE(TYPE,VALBUF) abort();
 153
 154 /* Extract from an array REGBUF containing the (raw) register state
 155    the address in which a function should return its structure value,
 156    as a CORE_ADDR (or an expression that can be used as one).  */
 157
 158 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 159 \f
 160 /* Describe the pointer in each stack frame to the previous stack frame
 161    (its caller).  */
 162
 163 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 164    chain-pointer.
 165    In the case of the Z8000, the frame's nominal address
 166    is the address of a ptr sized byte word containing the calling
 167    frame's address.  */
 168
 169 #define FRAME_CHAIN(thisframe) frame_chain(thisframe);
 170
 171
 172
 173 /* Define other aspects of the stack frame.  */
 174
 175 /* A macro that tells us whether the function invocation represented
 176    by FI does not have a frame on the stack associated with it.  If it
 177    does not, FRAMELESS is set to 1, else 0.  */
 178 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 179   (FRAMELESS) = frameless_look_for_prologue(FI)
 180
 181 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
 182
 183 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 184
 185 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 186
 187 /* Set VAL to the number of args passed to frame described by FI.
 188    Can set VAL to -1, meaning no way to tell.  */
 189
 190 /* We can't tell how many args there are
 191    now that the C compiler delays popping them.  */
 192 #if !defined (FRAME_NUM_ARGS)
 193 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 194 #endif
 195
 196 /* Return number of bytes at start of arglist that are not really args.  */
 197
 198 #define FRAME_ARGS_SKIP 8
 199
 200 #ifdef __STDC__
 201 struct frame_info;
 202 #endif
 203 extern void z8k_frame_init_saved_regs PARAMS ((struct frame_info *));
 204 #define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)
 205
 206 \f
 207 /* Things needed for making the inferior call functions.
 208    It seems like every m68k based machine has almost identical definitions
 209    in the individual machine's configuration files.  Most other cpu types
 210    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 211    for most configurations.  The m68k family should be able to do this as
 212    well.  These macros can still be overridden when necessary.  */
 213
 214 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 215    by gdb itself:
 216
 217         fmovemx fp0-fp7,sp@-                    0xf227 0xe0ff
 218         moveml d0-a5,sp@-                       0x48e7 0xfffc
 219         clrw sp@-                               0x4267
 220         movew ccr,sp@-                          0x42e7
 221
 222         /..* The arguments are pushed at this point by GDB;
 223         no code is needed in the dummy for this.
 224         The CALL_DUMMY_START_OFFSET gives the position of
 225         the following jsr instruction.  *../
 226
 227         jsr @#0x32323232                        0x4eb9 0x3232 0x3232
 228         addal #0x69696969,sp                    0xdffc 0x6969 0x6969
 229         trap #<your BPT_VECTOR number here>     0x4e4?
 230         nop                                     0x4e71
 231
 232    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 233    We actually start executing at the jsr, since the pushing of the
 234    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 235    the arguments for the function called by the jsr would be pushed
 236    between the moveml and the jsr, and we could allow it to execute through.
 237    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 238    done, and we cannot allow the moveml to push the registers again lest
 239    they be taken for the arguments.  */
 240
 241
 242 #define CALL_DUMMY { 0 }
 243 #define CALL_DUMMY_LENGTH 24            /* Size of CALL_DUMMY */
 244 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction*/
 245
 246
 247 /* Insert the specified number of args and function address
 248    into a call sequence of the above form stored at DUMMYNAME.
 249    We use the BFD routines to store a big-endian value of known size.  */
 250
 251 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 252 { bfd_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
 253   bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
 254
 255 /* Push an empty stack frame, to record the current PC, etc.  */
 256
 257 #define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }
 258
 259 extern void z8k_push_dummy_frame PARAMS ((void));
 260
 261 extern void z8k_pop_frame PARAMS ((void));
 262
 263 /* Discard from the stack the innermost frame, restoring all registers.  */
 264
 265 #define POP_FRAME               { z8k_pop_frame (); }
 266
 267 /* Offset from SP to first arg on stack at first instruction of a function */
 268
 269 #define SP_ARG0 (1 * 4)
 270
 271 extern CORE_ADDR z8k_addr_bits_remove PARAMS ((CORE_ADDR));
 272 #define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)
 273 int sim_z8001_mode;
 274 #define BIG (sim_z8001_mode)
 275
 276 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 277
 278 #define NO_STD_REGS
 279
 280 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
 281
 282
 283 #define INIT_EXTRA_SYMTAB_INFO \
 284   z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);
 285
 286 #define REGISTER_SIZE 4
 287