gdb/config/z8k/tm-z8k.h

   1 /* Parameters for execution on a z8000 series machine.
   2
   3    Copyright 1992, 1993, 1994, 1998, 1999, 2000, 2001, 2002 Free
   4    Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 /* NOTE: cagney/2002-11-24: This is a guess.  */
  24 #define USE_GENERIC_DUMMY_FRAMES 0
  25 #define CALL_DUMMY_LOCATION ON_STACK
  26 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) deprecated_pc_in_call_dummy_on_stack (pc, sp, frame_address)
  27
  28 #undef TARGET_INT_BIT
  29 #undef TARGET_LONG_BIT
  30 #undef TARGET_SHORT_BIT
  31 #undef TARGET_PTR_BIT
  32
  33 #define TARGET_SHORT_BIT 16
  34 #define TARGET_INT_BIT 16
  35 #define TARGET_LONG_BIT 32
  36 #define TARGET_PTR_BIT (BIG ? 32: 16)
  37
  38 /* Offset from address of function to start of its code.
  39    Zero on most machines.  */
  40
  41 #define FUNCTION_START_OFFSET 0
  42
  43 /* Advance PC across any function entry prologue instructions
  44    to reach some "real" code.  */
  45
  46 #define SKIP_PROLOGUE(ip)   (z8k_skip_prologue (ip))
  47 extern CORE_ADDR z8k_skip_prologue (CORE_ADDR ip);
  48
  49
  50 /* Immediately after a function call, return the saved pc.
  51    Can't always go through the frames for this because on some machines
  52    the new frame is not set up until the new function executes
  53    some instructions.  */
  54
  55
  56 extern int z8k_saved_pc_after_call (struct frame_info *frame);
  57 #define SAVED_PC_AFTER_CALL(frame) z8k_saved_pc_after_call(frame)
  58
  59 /* Stack grows downward.  */
  60
  61 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  62
  63 /* Sequence of bytes for breakpoint instruction. */
  64
  65 #define BREAKPOINT {0x36,0x00}
  66
  67 /* If your kernel resets the pc after the trap happens you may need to
  68    define this before including this file.  */
  69
  70 #define DECR_PC_AFTER_BREAK 0
  71
  72 /* Say how long registers are.  */
  73
  74 #define REGISTER_TYPE unsigned int
  75
  76 #define NUM_REGS        23      /* 16 registers + 1 ccr + 1 pc + 3 debug
  77                                    regs + fake fp + fake sp */
  78 #define REGISTER_BYTES  (NUM_REGS *4)
  79
  80 /* Index within `registers' of the first byte of the space for
  81    register N.  */
  82
  83 #define REGISTER_BYTE(N)  ((N)*4)
  84
  85 /* Number of bytes of storage in the actual machine representation
  86    for register N.  On the z8k, all but the pc are 2 bytes, but we
  87    keep them all as 4 bytes and trim them on I/O */
  88
  89
  90 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
  91
  92 /* Number of bytes of storage in the program's representation
  93    for register N.  */
  94
  95 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
  96
  97 /* Largest value REGISTER_RAW_SIZE can have.  */
  98
  99 #define MAX_REGISTER_RAW_SIZE 4
 100
 101 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 102
 103 #define MAX_REGISTER_VIRTUAL_SIZE 4
 104
 105 /* Return the GDB type object for the "standard" data type
 106    of data in register N.  */
 107
 108 #define REGISTER_VIRTUAL_TYPE(N) \
 109  (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
 110
 111 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */
 112 /* Initializer for an array of names of registers.
 113    Entries beyond the first NUM_REGS are ignored.  */
 114
 115 #define REGISTER_NAMES  \
 116  {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 117   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
 118   "ccr", "pc", "cycles","insts","time","fp","sp"}
 119
 120 /* Register numbers of various important registers.
 121    Note that some of these values are "real" register numbers,
 122    and correspond to the general registers of the machine,
 123    and some are "phony" register numbers which are too large
 124    to be actual register numbers as far as the user is concerned
 125    but do serve to get the desired values when passed to read_register.  */
 126
 127 #define CCR_REGNUM      16      /* Contains processor status */
 128 #define PC_REGNUM       17      /* Contains program counter */
 129 #define CYCLES_REGNUM   18
 130 #define INSTS_REGNUM    19
 131 #define TIME_REGNUM     20
 132 #define FP_REGNUM       21      /* Contains fp, whatever memory model */
 133 #define SP_REGNUM       22      /* Conatins sp, whatever memory model */
 134
 135
 136
 137 #define PTR_SIZE (BIG ? 4: 2)
 138 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
 139
 140 /* Store the address of the place in which to copy the structure the
 141    subroutine will return.  This is called from call_function. */
 142
 143 #define STORE_STRUCT_RETURN(ADDR, SP) internal_error (__FILE__, __LINE__, "failed internal consistency check");
 144
 145 /* Extract from an array REGBUF containing the (raw) register state
 146    a function return value of type TYPE, and copy that, in virtual format,
 147    into VALBUF.  This is assuming that floating point values are returned
 148    as doubles in d0/d1.  */
 149
 150
 151 #define DEPRECATED_EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 152   memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
 153
 154 /* Write into appropriate registers a function return value
 155    of type TYPE, given in virtual format. */
 156
 157 #define DEPRECATED_STORE_RETURN_VALUE(TYPE,VALBUF) internal_error (__FILE__, __LINE__, "failed internal consistency check");
 158
 159 /* Extract from an array REGBUF containing the (raw) register state
 160    the address in which a function should return its structure value,
 161    as a CORE_ADDR (or an expression that can be used as one).  */
 162
 163 #define DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
 164 \f
 165 /* Describe the pointer in each stack frame to the previous stack frame
 166    (its caller).  */
 167
 168 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
 169    chain-pointer.
 170    In the case of the Z8000, the frame's nominal address
 171    is the address of a ptr sized byte word containing the calling
 172    frame's address.  */
 173
 174 extern CORE_ADDR z8k_frame_chain (struct frame_info *thisframe);
 175 #define FRAME_CHAIN(thisframe) z8k_frame_chain(thisframe);
 176
 177
 178
 179 /* Define other aspects of the stack frame.  */
 180
 181 /* A macro that tells us whether the function invocation represented
 182    by FI does not have a frame on the stack associated with it.  If it
 183    does not, FRAMELESS is set to 1, else 0.  */
 184 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
 185   (frameless_look_for_prologue (FI))
 186
 187 extern CORE_ADDR z8k_frame_saved_pc (struct frame_info *frame);
 188 #define FRAME_SAVED_PC(FRAME) z8k_frame_saved_pc(FRAME)
 189
 190 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 191
 192 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 193
 194 /* Set VAL to the number of args passed to frame described by FI.
 195    Can set VAL to -1, meaning no way to tell.  */
 196
 197 /* We can't tell how many args there are
 198    now that the C compiler delays popping them.  */
 199 #if !defined (FRAME_NUM_ARGS)
 200 #define FRAME_NUM_ARGS(fi) (-1)
 201 #endif
 202
 203 /* Return number of bytes at start of arglist that are not really args.  */
 204
 205 #define FRAME_ARGS_SKIP 8
 206
 207 struct frame_info;
 208 extern void z8k_frame_init_saved_regs (struct frame_info *);
 209 #define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)
 210 \f
 211
 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 (void);
 265
 266 extern void z8k_pop_frame (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 extern CORE_ADDR z8k_addr_bits_remove (CORE_ADDR);
 277 #define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)
 278 int sim_z8001_mode;
 279 #define BIG (sim_z8001_mode)
 280
 281 #define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
 282
 283 #define NO_STD_REGS
 284
 285 extern void z8k_do_registers_info (int regnum, int all);
 286 #define DEPRECATED_DO_REGISTERS_INFO(REGNUM,ALL) \
 287         z8k_do_registers_info (REGNUM, ALL)
 288
 289 extern void z8k_set_pointer_size (int newsize);
 290 #define INIT_EXTRA_SYMTAB_INFO \
 291   z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);
 292
 293 #define REGISTER_SIZE 4