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 #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 /* Offset from address of function to start of its code.
  33    Zero on most machines.  */
  34
  35 #define FUNCTION_START_OFFSET 0
  36
  37 /* Advance PC across any function entry prologue instructions
  38    to reach some "real" code.  */
  39
  40 #define SKIP_PROLOGUE(ip)   (z8k_skip_prologue (ip))
  41 extern CORE_ADDR z8k_skip_prologue (CORE_ADDR ip);
  42
  43
  44 /* Immediately after a function call, return the saved pc.
  45    Can't always go through the frames for this because on some machines
  46    the new frame is not set up until the new function executes
  47    some instructions.  */
  48
  49
  50 extern int z8k_saved_pc_after_call (struct frame_info *frame);
  51 #define SAVED_PC_AFTER_CALL(frame) z8k_saved_pc_after_call(frame)
  52
  53 /* Stack grows downward.  */
  54
  55 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  56
  57 /* Sequence of bytes for breakpoint instruction. */
  58
  59 #define BREAKPOINT {0x36,0x00}
  60
  61 /* If your kernel resets the pc after the trap happens you may need to
  62    define this before including this file.  */
  63
  64 #define DECR_PC_AFTER_BREAK 0
  65
  66 /* Say how long registers are.  */
  67
  68 #define REGISTER_TYPE unsigned int
  69
  70 #define NUM_REGS        23      /* 16 registers + 1 ccr + 1 pc + 3 debug
  71                                    regs + fake fp + fake sp */
  72 #define REGISTER_BYTES  (NUM_REGS *4)
  73
  74 /* Index within `registers' of the first byte of the space for
  75    register N.  */
  76
  77 #define REGISTER_BYTE(N)  ((N)*4)
  78
  79 /* Number of bytes of storage in the actual machine representation
  80    for register N.  On the z8k, all but the pc are 2 bytes, but we
  81    keep them all as 4 bytes and trim them on I/O */
  82
  83
  84 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
  85
  86 /* Number of bytes of storage in the program's representation
  87    for register N.  */
  88
  89 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
  90
  91 /* Largest value REGISTER_RAW_SIZE can have.  */
  92
  93 #define MAX_REGISTER_RAW_SIZE 4
  94
  95 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
  96
  97 #define MAX_REGISTER_VIRTUAL_SIZE 4
  98
  99 /* Return the GDB type object for the "standard" data type
 100    of data in register N.  */
 101
 102 #define REGISTER_VIRTUAL_TYPE(N) \
 103  (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
 104
 105 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */
 106 /* Initializer for an array of names of registers.
 107    Entries beyond the first NUM_REGS are ignored.  */
 108
 109 #define REGISTER_NAMES  \
 110  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 111   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
 112   "ccr", "pc", "cycles","insts","time","fp","sp"}
 113
 114 /* Register numbers of various important registers.
 115    Note that some of these values are "real" register numbers,
 116    and correspond to the general registers of the machine,
 117    and some are "phony" register numbers which are too large
 118    to be actual register numbers as far as the user is concerned
 119    but do serve to get the desired values when passed to read_register.  */
 120
 121 #define CCR_REGNUM      16      /* Contains processor status */
 122 #define PC_REGNUM       17      /* Contains program counter */
 123 #define CYCLES_REGNUM   18
 124 #define INSTS_REGNUM    19
 125 #define TIME_REGNUM     20
 126 #define FP_REGNUM       21      /* Contains fp, whatever memory model */
 127 #define SP_REGNUM       22      /* Conatins sp, whatever memory model */
 128
 129
 130
 131 #define PTR_SIZE (BIG ? 4: 2)
 132 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 133
 134 /* Store the address of the place in which to copy the structure the
 135    subroutine will return.  This is called from call_function. */
 136
 137 #define STORE_STRUCT_RETURN(ADDR, SP) internal_error (__FILE__, __LINE__, "failed internal consistency check");
 138
 139 /* Extract from an array REGBUF containing the (raw) register state
 140    a function return value of type TYPE, and copy that, in virtual format,
 141    into VALBUF.  This is assuming that floating point values are returned
 142    as doubles in d0/d1.  */
 143
 144
 145 #define DEPRECATED_EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 146   memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
 147
 148 /* Write into appropriate registers a function return value
 149    of type TYPE, given in virtual format. */
 150
 151 #define STORE_RETURN_VALUE(TYPE,VALBUF) internal_error (__FILE__, __LINE__, "failed internal consistency check");
 152
 153 /* Extract from an array REGBUF containing the (raw) register state
 154    the address in which a function should return its structure value,
 155    as a CORE_ADDR (or an expression that can be used as one).  */
 156
 157 #define DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 158 \f
 159 /* Describe the pointer in each stack frame to the previous stack frame
 160    (its caller).  */
 161
 162 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 163    chain-pointer.
 164    In the case of the Z8000, the frame's nominal address
 165    is the address of a ptr sized byte word containing the calling
 166    frame's address.  */
 167
 168 extern CORE_ADDR z8k_frame_chain (struct frame_info *thisframe);
 169 #define FRAME_CHAIN(thisframe) z8k_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) \
 179   (frameless_look_for_prologue (FI))
 180
 181 extern CORE_ADDR z8k_frame_saved_pc (struct frame_info *frame);
 182 #define FRAME_SAVED_PC(FRAME) z8k_frame_saved_pc(FRAME)
 183
 184 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 185
 186 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 187
 188 /* Set VAL to the number of args passed to frame described by FI.
 189    Can set VAL to -1, meaning no way to tell.  */
 190
 191 /* We can't tell how many args there are
 192    now that the C compiler delays popping them.  */
 193 #if !defined (FRAME_NUM_ARGS)
 194 #define FRAME_NUM_ARGS(fi) (-1)
 195 #endif
 196
 197 /* Return number of bytes at start of arglist that are not really args.  */
 198
 199 #define FRAME_ARGS_SKIP 8
 200
 201 struct frame_info;
 202 extern void z8k_frame_init_saved_regs (struct frame_info *);
 203 #define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)
 204 \f
 205
 206 /* Things needed for making the inferior call functions.
 207    It seems like every m68k based machine has almost identical definitions
 208    in the individual machine's configuration files.  Most other cpu types
 209    (mips, i386, etc) have routines in their *-tdep.c files to handle this
 210    for most configurations.  The m68k family should be able to do this as
 211    well.  These macros can still be overridden when necessary.  */
 212
 213 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
 214    by gdb itself:
 215
 216    fmovemx fp0-fp7,sp@-                 0xf227 0xe0ff
 217    moveml d0-a5,sp@-                    0x48e7 0xfffc
 218    clrw sp@-                            0x4267
 219    movew ccr,sp@-                               0x42e7
 220
 221    /..* The arguments are pushed at this point by GDB;
 222    no code is needed in the dummy for this.
 223    The CALL_DUMMY_START_OFFSET gives the position of
 224    the following jsr instruction.  *../
 225
 226    jsr @#0x32323232                     0x4eb9 0x3232 0x3232
 227    addal #0x69696969,sp                 0xdffc 0x6969 0x6969
 228    trap #<your BPT_VECTOR number here>  0x4e4?
 229    nop                                  0x4e71
 230
 231    Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
 232    We actually start executing at the jsr, since the pushing of the
 233    registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 234    the arguments for the function called by the jsr would be pushed
 235    between the moveml and the jsr, and we could allow it to execute through.
 236    But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
 237    done, and we cannot allow the moveml to push the registers again lest
 238    they be taken for the arguments.  */
 239
 240
 241 #define CALL_DUMMY { 0 }
 242 #define CALL_DUMMY_LENGTH 24    /* Size of CALL_DUMMY */
 243 #define CALL_DUMMY_START_OFFSET 8       /* Offset to jsr instruction */
 244
 245
 246 /* Insert the specified number of args and function address
 247    into a call sequence of the above form stored at DUMMYNAME.
 248    We use the BFD routines to store a big-endian value of known size.  */
 249
 250 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 251 { bfd_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
 252   bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
 253
 254 /* Push an empty stack frame, to record the current PC, etc.  */
 255
 256 #define PUSH_DUMMY_FRAME        { z8k_push_dummy_frame (); }
 257
 258 extern void z8k_push_dummy_frame (void);
 259
 260 extern void z8k_pop_frame (void);
 261
 262 /* Discard from the stack the innermost frame, restoring all registers.  */
 263
 264 #define POP_FRAME               { z8k_pop_frame (); }
 265
 266 /* Offset from SP to first arg on stack at first instruction of a function */
 267
 268 #define SP_ARG0 (1 * 4)
 269
 270 extern CORE_ADDR z8k_addr_bits_remove (CORE_ADDR);
 271 #define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)
 272 int sim_z8001_mode;
 273 #define BIG (sim_z8001_mode)
 274
 275 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 276
 277 #define NO_STD_REGS
 278
 279 extern void z8k_print_register_hook (int regno);
 280 #define PRINT_REGISTER_HOOK(regno) z8k_print_register_hook(regno)
 281
 282
 283 extern void z8k_set_pointer_size (int newsize);
 284 #define INIT_EXTRA_SYMTAB_INFO \
 285   z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);
 286
 287 #define REGISTER_SIZE 4