gdb/config/z8k/tm-z8k.h

   1 /* Parameters for execution on a z8000 series machine.
   2    Copyright 1992, 1993, 1994, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  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)   (z8k_skip_prologue (ip))
  46 extern CORE_ADDR z8k_skip_prologue (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
  55 extern int z8k_saved_pc_after_call (struct frame_info *frame);
  56 #define SAVED_PC_AFTER_CALL(frame) z8k_saved_pc_after_call(frame)
  57
  58 /* Stack grows downward.  */
  59
  60 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  61
  62 /* Sequence of bytes for breakpoint instruction. */
  63
  64 #define BREAKPOINT {0x36,0x00}
  65
  66 /* If your kernel resets the pc after the trap happens you may need to
  67    define this before including this file.  */
  68
  69 #define DECR_PC_AFTER_BREAK 0
  70
  71 /* Say how long registers are.  */
  72
  73 #define REGISTER_TYPE unsigned int
  74
  75 #define NUM_REGS        23      /* 16 registers + 1 ccr + 1 pc + 3 debug
  76                                    regs + fake fp + fake sp */
  77 #define REGISTER_BYTES  (NUM_REGS *4)
  78
  79 /* Index within `registers' of the first byte of the space for
  80    register N.  */
  81
  82 #define REGISTER_BYTE(N)  ((N)*4)
  83
  84 /* Number of bytes of storage in the actual machine representation
  85    for register N.  On the z8k, all but the pc are 2 bytes, but we
  86    keep them all as 4 bytes and trim them on I/O */
  87
  88
  89 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
  90
  91 /* Number of bytes of storage in the program's representation
  92    for register N.  */
  93
  94 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
  95
  96 /* Largest value REGISTER_RAW_SIZE can have.  */
  97
  98 #define MAX_REGISTER_RAW_SIZE 4
  99
 100 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 101
 102 #define MAX_REGISTER_VIRTUAL_SIZE 4
 103
 104 /* Return the GDB type object for the "standard" data type
 105    of data in register N.  */
 106
 107 #define REGISTER_VIRTUAL_TYPE(N) \
 108  (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
 109
 110 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */
 111 /* Initializer for an array of names of registers.
 112    Entries beyond the first NUM_REGS are ignored.  */
 113
 114 #define REGISTER_NAMES  \
 115  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 116   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
 117   "ccr", "pc", "cycles","insts","time","fp","sp"}
 118
 119 /* Register numbers of various important registers.
 120    Note that some of these values are "real" register numbers,
 121    and correspond to the general registers of the machine,
 122    and some are "phony" register numbers which are too large
 123    to be actual register numbers as far as the user is concerned
 124    but do serve to get the desired values when passed to read_register.  */
 125
 126 #define CCR_REGNUM      16      /* Contains processor status */
 127 #define PC_REGNUM       17      /* Contains program counter */
 128 #define CYCLES_REGNUM   18
 129 #define INSTS_REGNUM    19
 130 #define TIME_REGNUM     20
 131 #define FP_REGNUM       21      /* Contains fp, whatever memory model */
 132 #define SP_REGNUM       22      /* Conatins sp, whatever memory model */
 133
 134
 135
 136 #define PTR_SIZE (BIG ? 4: 2)
 137 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 138
 139 /* Store the address of the place in which to copy the structure the
 140    subroutine will return.  This is called from call_function. */
 141
 142 #define STORE_STRUCT_RETURN(ADDR, SP) internal_error (__FILE__, __LINE__, "failed internal consistency check");
 143
 144 /* Extract from an array REGBUF containing the (raw) register state
 145    a function return value of type TYPE, and copy that, in virtual format,
 146    into VALBUF.  This is assuming that floating point values are returned
 147    as doubles in d0/d1.  */
 148
 149
 150 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 151   memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
 152
 153 /* Write into appropriate registers a function return value
 154    of type TYPE, given in virtual format. */
 155
 156 #define STORE_RETURN_VALUE(TYPE,VALBUF) internal_error (__FILE__, __LINE__, "failed internal consistency check");
 157
 158 /* Extract from an array REGBUF containing the (raw) register state
 159    the address in which a function should return its structure value,
 160    as a CORE_ADDR (or an expression that can be used as one).  */
 161
 162 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 163 \f
 164 /* Describe the pointer in each stack frame to the previous stack frame
 165    (its caller).  */
 166
 167 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 168    chain-pointer.
 169    In the case of the Z8000, the frame's nominal address
 170    is the address of a ptr sized byte word containing the calling
 171    frame's address.  */
 172
 173 extern CORE_ADDR z8k_frame_chain (struct frame_info *thisframe);
 174 #define FRAME_CHAIN(thisframe) z8k_frame_chain(thisframe);
 175
 176
 177
 178 /* Define other aspects of the stack frame.  */
 179
 180 /* A macro that tells us whether the function invocation represented
 181    by FI does not have a frame on the stack associated with it.  If it
 182    does not, FRAMELESS is set to 1, else 0.  */
 183 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
 184   (frameless_look_for_prologue (FI))
 185
 186 extern CORE_ADDR z8k_frame_saved_pc (struct frame_info *frame);
 187 #define FRAME_SAVED_PC(FRAME) z8k_frame_saved_pc(FRAME)
 188
 189 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 190
 191 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 192
 193 /* Set VAL to the number of args passed to frame described by FI.
 194    Can set VAL to -1, meaning no way to tell.  */
 195
 196 /* We can't tell how many args there are
 197    now that the C compiler delays popping them.  */
 198 #if !defined (FRAME_NUM_ARGS)
 199 #define FRAME_NUM_ARGS(fi) (-1)
 200 #endif
 201
 202 /* Return number of bytes at start of arglist that are not really args.  */
 203
 204 #define FRAME_ARGS_SKIP 8
 205
 206 struct frame_info;
 207 extern void z8k_frame_init_saved_regs (struct frame_info *);
 208 #define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)
 209 \f
 210
 211 /* Things needed for making the inferior call functions.
 212    It seems like every m68k based machine has almost identical definitions
 213    in the individual machine's configuration files.  Most other cpu types
 214    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 215    for most configurations.  The m68k family should be able to do this as
 216    well.  These macros can still be overridden when necessary.  */
 217
 218 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 219    by gdb itself:
 220
 221    fmovemx fp0-fp7,sp@-                 0xf227 0xe0ff
 222    moveml d0-a5,sp@-                    0x48e7 0xfffc
 223    clrw sp@-                            0x4267
 224    movew ccr,sp@-                               0x42e7
 225
 226    /..* The arguments are pushed at this point by GDB;
 227    no code is needed in the dummy for this.
 228    The CALL_DUMMY_START_OFFSET gives the position of
 229    the following jsr instruction.  *../
 230
 231    jsr @#0x32323232                     0x4eb9 0x3232 0x3232
 232    addal #0x69696969,sp                 0xdffc 0x6969 0x6969
 233    trap #<your BPT_VECTOR number here>  0x4e4?
 234    nop                                  0x4e71
 235
 236    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 237    We actually start executing at the jsr, since the pushing of the
 238    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 239    the arguments for the function called by the jsr would be pushed
 240    between the moveml and the jsr, and we could allow it to execute through.
 241    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 242    done, and we cannot allow the moveml to push the registers again lest
 243    they be taken for the arguments.  */
 244
 245
 246 #define CALL_DUMMY { 0 }
 247 #define CALL_DUMMY_LENGTH 24    /* Size of CALL_DUMMY */
 248 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction */
 249
 250
 251 /* Insert the specified number of args and function address
 252    into a call sequence of the above form stored at DUMMYNAME.
 253    We use the BFD routines to store a big-endian value of known size.  */
 254
 255 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 256 { bfd_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
 257   bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
 258
 259 /* Push an empty stack frame, to record the current PC, etc.  */
 260
 261 #define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }
 262
 263 extern void z8k_push_dummy_frame (void);
 264
 265 extern void z8k_pop_frame (void);
 266
 267 /* Discard from the stack the innermost frame, restoring all registers.  */
 268
 269 #define POP_FRAME               { z8k_pop_frame (); }
 270
 271 /* Offset from SP to first arg on stack at first instruction of a function */
 272
 273 #define SP_ARG0 (1 * 4)
 274
 275 extern CORE_ADDR z8k_addr_bits_remove (CORE_ADDR);
 276 #define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)
 277 int sim_z8001_mode;
 278 #define BIG (sim_z8001_mode)
 279
 280 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 281
 282 #define NO_STD_REGS
 283
 284 extern void z8k_print_register_hook (int regno);
 285 #define PRINT_REGISTER_HOOK(regno) z8k_print_register_hook(regno)
 286
 287
 288 extern void z8k_set_pointer_size (int newsize);
 289 #define INIT_EXTRA_SYMTAB_INFO \
 290   z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);
 291
 292 #define REGISTER_SIZE 4