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,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #define IEEE_FLOAT 1
  22
  23 #undef TARGET_INT_BIT
  24 #undef TARGET_LONG_BIT
  25 #undef TARGET_SHORT_BIT
  26 #undef TARGET_PTR_BIT
  27
  28 #define TARGET_SHORT_BIT 16
  29 #define TARGET_INT_BIT 16
  30 #define TARGET_LONG_BIT 32
  31 #define TARGET_PTR_BIT (BIG ? 32: 16)
  32
  33 /* Define the bit, byte, and word ordering of the machine.  */
  34 #define TARGET_BYTE_ORDER BIG_ENDIAN
  35
  36 /* Offset from address of function to start of its code.
  37    Zero on most machines.  */
  38
  39 #define FUNCTION_START_OFFSET 0
  40
  41 /* Advance PC across any function entry prologue instructions
  42    to reach some "real" code.  */
  43
  44 #define SKIP_PROLOGUE(ip)   (z8k_skip_prologue (ip))
  45 extern CORE_ADDR z8k_skip_prologue PARAMS ((CORE_ADDR ip));
  46
  47
  48 /* Immediately after a function call, return the saved pc.
  49    Can't always go through the frames for this because on some machines
  50    the new frame is not set up until the new function executes
  51    some instructions.  */
  52
  53
  54 extern int z8k_saved_pc_after_call (struct frame_info *frame);
  55 #define SAVED_PC_AFTER_CALL(frame) z8k_saved_pc_after_call(frame)
  56
  57 /* Stack grows downward.  */
  58
  59 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  60
  61 /* Sequence of bytes for breakpoint instruction. */
  62
  63 #define BREAKPOINT {0x36,0x00}
  64
  65 /* If your kernel resets the pc after the trap happens you may need to
  66    define this before including this file.  */
  67
  68 #define DECR_PC_AFTER_BREAK 0
  69
  70 /* Say how long registers are.  */
  71
  72 #define REGISTER_TYPE unsigned int
  73
  74 #define NUM_REGS        23      /* 16 registers + 1 ccr + 1 pc + 3 debug
  75                                    regs + fake fp + fake sp */
  76 #define REGISTER_BYTES  (NUM_REGS *4)
  77
  78 /* Index within `registers' of the first byte of the space for
  79    register N.  */
  80
  81 #define REGISTER_BYTE(N)  ((N)*4)
  82
  83 /* Number of bytes of storage in the actual machine representation
  84    for register N.  On the z8k, all but the pc are 2 bytes, but we
  85    keep them all as 4 bytes and trim them on I/O */
  86
  87
  88 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
  89
  90 /* Number of bytes of storage in the program's representation
  91    for register N.  */
  92
  93 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
  94
  95 /* Largest value REGISTER_RAW_SIZE can have.  */
  96
  97 #define MAX_REGISTER_RAW_SIZE 4
  98
  99 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 100
 101 #define MAX_REGISTER_VIRTUAL_SIZE 4
 102
 103 /* Return the GDB type object for the "standard" data type
 104    of data in register N.  */
 105
 106 #define REGISTER_VIRTUAL_TYPE(N) \
 107  (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
 108
 109 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */
 110 /* Initializer for an array of names of registers.
 111    Entries beyond the first NUM_REGS are ignored.  */
 112
 113 #define REGISTER_NAMES  \
 114  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 115   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
 116   "ccr", "pc", "cycles","insts","time","fp","sp"}
 117
 118 /* Register numbers of various important registers.
 119    Note that some of these values are "real" register numbers,
 120    and correspond to the general registers of the machine,
 121    and some are "phony" register numbers which are too large
 122    to be actual register numbers as far as the user is concerned
 123    but do serve to get the desired values when passed to read_register.  */
 124
 125 #define CCR_REGNUM      16      /* Contains processor status */
 126 #define PC_REGNUM       17      /* Contains program counter */
 127 #define CYCLES_REGNUM   18
 128 #define INSTS_REGNUM    19
 129 #define TIME_REGNUM     20
 130 #define FP_REGNUM       21      /* Contains fp, whatever memory model */
 131 #define SP_REGNUM       22      /* Conatins sp, whatever memory model */
 132
 133
 134
 135 #define PTR_SIZE (BIG ? 4: 2)
 136 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 137
 138 /* Store the address of the place in which to copy the structure the
 139    subroutine will return.  This is called from call_function. */
 140
 141 #define STORE_STRUCT_RETURN(ADDR, SP) abort();
 142
 143 /* Extract from an array REGBUF containing the (raw) register state
 144    a function return value of type TYPE, and copy that, in virtual format,
 145    into VALBUF.  This is assuming that floating point values are returned
 146    as doubles in d0/d1.  */
 147
 148
 149 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 150   memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
 151
 152 /* Write into appropriate registers a function return value
 153    of type TYPE, given in virtual format. */
 154
 155 #define STORE_RETURN_VALUE(TYPE,VALBUF) abort();
 156
 157 /* Extract from an array REGBUF containing the (raw) register state
 158    the address in which a function should return its structure value,
 159    as a CORE_ADDR (or an expression that can be used as one).  */
 160
 161 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 162 \f
 163 /* Describe the pointer in each stack frame to the previous stack frame
 164    (its caller).  */
 165
 166 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 167    chain-pointer.
 168    In the case of the Z8000, the frame's nominal address
 169    is the address of a ptr sized byte word containing the calling
 170    frame's address.  */
 171
 172 extern CORE_ADDR z8k_frame_chain (struct frame_info *thisframe);
 173 #define FRAME_CHAIN(thisframe) z8k_frame_chain(thisframe);
 174
 175
 176
 177 /* Define other aspects of the stack frame.  */
 178
 179 /* A macro that tells us whether the function invocation represented
 180    by FI does not have a frame on the stack associated with it.  If it
 181    does not, FRAMELESS is set to 1, else 0.  */
 182 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
 183   (frameless_look_for_prologue (FI))
 184
 185 extern CORE_ADDR z8k_frame_saved_pc (struct frame_info *frame);
 186 #define FRAME_SAVED_PC(FRAME) z8k_frame_saved_pc(FRAME)
 187
 188 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 189
 190 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 191
 192 /* Set VAL to the number of args passed to frame described by FI.
 193    Can set VAL to -1, meaning no way to tell.  */
 194
 195 /* We can't tell how many args there are
 196    now that the C compiler delays popping them.  */
 197 #if !defined (FRAME_NUM_ARGS)
 198 #define FRAME_NUM_ARGS(fi) (-1)
 199 #endif
 200
 201 /* Return number of bytes at start of arglist that are not really args.  */
 202
 203 #define FRAME_ARGS_SKIP 8
 204
 205 struct frame_info;
 206 extern void z8k_frame_init_saved_regs PARAMS ((struct frame_info *));
 207 #define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)
 208 \f
 209
 210 /* Things needed for making the inferior call functions.
 211    It seems like every m68k based machine has almost identical definitions
 212    in the individual machine's configuration files.  Most other cpu types
 213    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 214    for most configurations.  The m68k family should be able to do this as
 215    well.  These macros can still be overridden when necessary.  */
 216
 217 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 218    by gdb itself:
 219
 220    fmovemx fp0-fp7,sp@-                 0xf227 0xe0ff
 221    moveml d0-a5,sp@-                    0x48e7 0xfffc
 222    clrw sp@-                            0x4267
 223    movew ccr,sp@-                               0x42e7
 224
 225    /..* The arguments are pushed at this point by GDB;
 226    no code is needed in the dummy for this.
 227    The CALL_DUMMY_START_OFFSET gives the position of
 228    the following jsr instruction.  *../
 229
 230    jsr @#0x32323232                     0x4eb9 0x3232 0x3232
 231    addal #0x69696969,sp                 0xdffc 0x6969 0x6969
 232    trap #<your BPT_VECTOR number here>  0x4e4?
 233    nop                                  0x4e71
 234
 235    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 236    We actually start executing at the jsr, since the pushing of the
 237    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 238    the arguments for the function called by the jsr would be pushed
 239    between the moveml and the jsr, and we could allow it to execute through.
 240    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 241    done, and we cannot allow the moveml to push the registers again lest
 242    they be taken for the arguments.  */
 243
 244
 245 #define CALL_DUMMY { 0 }
 246 #define CALL_DUMMY_LENGTH 24    /* Size of CALL_DUMMY */
 247 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction */
 248
 249
 250 /* Insert the specified number of args and function address
 251    into a call sequence of the above form stored at DUMMYNAME.
 252    We use the BFD routines to store a big-endian value of known size.  */
 253
 254 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 255 { bfd_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
 256   bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
 257
 258 /* Push an empty stack frame, to record the current PC, etc.  */
 259
 260 #define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }
 261
 262 extern void z8k_push_dummy_frame PARAMS ((void));
 263
 264 extern void z8k_pop_frame PARAMS ((void));
 265
 266 /* Discard from the stack the innermost frame, restoring all registers.  */
 267
 268 #define POP_FRAME               { z8k_pop_frame (); }
 269
 270 /* Offset from SP to first arg on stack at first instruction of a function */
 271
 272 #define SP_ARG0 (1 * 4)
 273
 274 extern CORE_ADDR z8k_addr_bits_remove PARAMS ((CORE_ADDR));
 275 #define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)
 276 int sim_z8001_mode;
 277 #define BIG (sim_z8001_mode)
 278
 279 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 280
 281 #define NO_STD_REGS
 282
 283 extern void z8k_print_register_hook (int regno);
 284 #define PRINT_REGISTER_HOOK(regno) z8k_print_register_hook(regno)
 285
 286
 287 extern void z8k_set_pointer_size (int newsize);
 288 #define INIT_EXTRA_SYMTAB_INFO \
 289   z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);
 290
 291 #define REGISTER_SIZE 4