gdb/tm-sun386.h

   1 /* Parameters for execution on a Sun 386i, for GDB, the GNU debugger.
   2    Copyright (C) 1986, 1987 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 GDB 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 1, or (at your option)
   9 any later version.
  10
  11 GDB 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 GDB; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
  21
  22 #ifndef sun386
  23 #define sun386
  24 #endif
  25 #define SUNOS4
  26 #define USE_MACHINE_REG_H
  27
  28 /* Perhaps some day this will work even without the following #define */
  29 #define COFF_ENCAPSULATE
  30
  31 #ifdef COFF_ENCAPSULATE
  32 #define NAMES_HAVE_UNDERSCORE
  33 /* Avoid conflicts between "a.out.gnu.h" and <sys/exec.h> */
  34 #define _EXEC_
  35 #endif
  36
  37 #define BROKEN_LARGE_ALLOCA
  38
  39 /* sun386 ptrace seems unable to change the frame pointer */
  40 #define PTRACE_FP_BUG
  41
  42 /* Debugger information will be in DBX format.  */
  43
  44 #define READ_DBX_FORMAT
  45
  46 /* Offset from address of function to start of its code.
  47    Zero on most machines.  */
  48
  49 #define FUNCTION_START_OFFSET 0
  50
  51 /* Advance PC across any function entry prologue instructions
  52    to reach some "real" code.  */
  53
  54 #define SKIP_PROLOGUE(frompc)   {(frompc) = i386_skip_prologue((frompc));}
  55
  56 /* Immediately after a function call, return the saved pc.
  57    Can't always go through the frames for this because on some machines
  58    the new frame is not set up until the new function executes
  59    some instructions.  */
  60
  61 #define SAVED_PC_AFTER_CALL(frame) \
  62   (read_memory_integer (read_register (SP_REGNUM), 4))
  63
  64 /* Address of end of stack space.  */
  65
  66 #define STACK_END_ADDR 0xfc000000
  67
  68 /* Stack grows downward.  */
  69
  70 #define INNER_THAN <
  71
  72 /* Sequence of bytes for breakpoint instruction.  */
  73
  74 #define BREAKPOINT {0xcc}
  75
  76 /* Amount PC must be decremented by after a breakpoint.
  77    This is often the number of bytes in BREAKPOINT
  78    but not always.  */
  79
  80 #define DECR_PC_AFTER_BREAK 1
  81
  82 /* Nonzero if instruction at PC is a return instruction.  */
  83
  84 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3)
  85
  86 /* Return 1 if P points to an invalid floating point value.
  87    LEN is the length in bytes -- not relevant on the 386.  */
  88
  89 #define INVALID_FLOAT(p, len) (0)
  90
  91 /* Largest integer type */
  92 #define LONGEST long
  93
  94 /* Name of the builtin type for the LONGEST type above. */
  95 #define BUILTIN_TYPE_LONGEST builtin_type_long
  96
  97 /* Say how long (ordinary) registers are.  */
  98
  99 #define REGISTER_TYPE long
 100
 101 /* Number of machine registers */
 102
 103 #define NUM_REGS 35
 104
 105 /* Initializer for an array of names of registers.
 106    There should be NUM_REGS strings in this initializer.  */
 107
 108 /* the order of the first 8 registers must match the compiler's
 109  * numbering scheme (which is the same as the 386 scheme)
 110  * also, this table must match regmap in i386-pinsn.c.
 111  */
 112 #define REGISTER_NAMES { "gs", "fs", "es", "ds",                \
 113                          "edi", "esi", "ebp", "esp",            \
 114                          "ebx", "edx", "ecx", "eax",            \
 115                          "retaddr", "trapnum", "errcode", "ip", \
 116                          "cs", "ps", "sp", "ss",                \
 117                          "fst0", "fst1", "fst2", "fst3",        \
 118                          "fst4", "fst5", "fst6", "fst7",        \
 119                          "fctrl", "fstat", "ftag", "fip",       \
 120                          "fcs", "fopoff", "fopsel"              \
 121                          }
 122
 123 /* Register numbers of various important registers.
 124    Note that some of these values are "real" register numbers,
 125    and correspond to the general registers of the machine,
 126    and some are "phony" register numbers which are too large
 127    to be actual register numbers as far as the user is concerned
 128    but do serve to get the desired values when passed to read_register.  */
 129
 130 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 131 #define SP_REGNUM 18            /* Contains address of top of stack */
 132 #define PS_REGNUM 17            /* Contains processor status */
 133 #define PC_REGNUM 15            /* Contains program counter */
 134 #define FP0_REGNUM 20           /* Floating point register 0 */
 135 #define FPC_REGNUM 28           /* 80387 control register */
 136
 137 /* Total amount of space needed to store our copies of the machine's
 138    register state, the array `registers'.  */
 139 #define REGISTER_BYTES (20*4+8*10+7*4)
 140
 141 /* Index within `registers' of the first byte of the space for
 142    register N.  */
 143
 144 #define REGISTER_BYTE(N) \
 145  ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160    \
 146   : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80  \
 147   : (N) * 4)
 148
 149 /* Number of bytes of storage in the actual machine representation
 150    for register N.  */
 151
 152 #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4)
 153
 154 /* Number of bytes of storage in the program's representation
 155    for register N. */
 156
 157 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4)
 158
 159 /* Largest value REGISTER_RAW_SIZE can have.  */
 160
 161 #define MAX_REGISTER_RAW_SIZE 10
 162
 163 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 164
 165 #define MAX_REGISTER_VIRTUAL_SIZE 8
 166
 167 /* Nonzero if register N requires conversion
 168    from raw format to virtual format.  */
 169
 170 #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8)
 171
 172 /* Convert data from raw format for register REGNUM
 173    to virtual format for register REGNUM.  */
 174
 175 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 176 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 177     i387_to_double ((FROM), (TO));                      \
 178   else                                                  \
 179     bcopy ((FROM), (TO), 4); }
 180
 181 /* Convert data from virtual format for register REGNUM
 182    to raw format for register REGNUM.  */
 183
 184 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)         \
 185 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 186     double_to_i387 ((FROM), (TO));      \
 187   else                                  \
 188     bcopy ((FROM), (TO), 4); }
 189
 190 /* Return the GDB type object for the "standard" data type
 191    of data in register N.  */
 192
 193 #define REGISTER_VIRTUAL_TYPE(N) \
 194  (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int)
 195
 196 /* Store the address of the place in which to copy the structure the
 197    subroutine will return.  This is called from call_function. */
 198
 199 #define STORE_STRUCT_RETURN(ADDR, SP) \
 200   { (SP) -= sizeof (ADDR);              \
 201     write_memory ((SP), &(ADDR), sizeof (ADDR)); }
 202
 203 /* Extract from an array REGBUF containing the (raw) register state
 204    a function return value of type TYPE, and copy that, in virtual format,
 205    into VALBUF.  */
 206
 207 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 208   bcopy (REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 209
 210 /* Write into appropriate registers a function return value
 211    of type TYPE, given in virtual format.  */
 212
 213 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 214   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 215
 216 /* Extract from an array REGBUF containing the (raw) register state
 217    the address in which a function should return its structure value,
 218    as a CORE_ADDR (or an expression that can be used as one).  */
 219
 220 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 221 \f
 222 /* Describe the pointer in each stack frame to the previous stack frame
 223    (its caller).  */
 224
 225 /* FRAME_CHAIN takes a frame's nominal address
 226    and produces the frame's chain-pointer.
 227
 228    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 229    and produces the nominal address of the caller frame.
 230
 231    However, if FRAME_CHAIN_VALID returns zero,
 232    it means the given frame is the outermost one and has no caller.
 233    In that case, FRAME_CHAIN_COMBINE is not used.  */
 234
 235 #define FRAME_CHAIN(thisframe) \
 236   (outside_startup_file ((thisframe)->pc) ? \
 237    read_memory_integer ((thisframe)->frame, 4) :\
 238    0)
 239
 240 #define FRAME_CHAIN_VALID(chain, thisframe) \
 241   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 242
 243 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 244
 245 /* Define other aspects of the stack frame.  */
 246
 247 /* A macro that tells us whether the function invocation represented
 248    by FI does not have a frame on the stack associated with it.  If it
 249    does not, FRAMELESS is set to 1, else 0.  */
 250 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 251 { (FRAMELESS) = frameless_look_for_prologue (FI); }
 252
 253 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 254
 255 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 256
 257 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 258
 259 /* Return number of args passed to a frame.
 260    Can return -1, meaning no way to tell.  */
 261
 262 #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
 263
 264 /* Return number of bytes at start of arglist that are not really args.  */
 265
 266 #define FRAME_ARGS_SKIP 8
 267
 268 /* Put here the code to store, into a struct frame_saved_regs,
 269    the addresses of the saved registers of frame described by FRAME_INFO.
 270    This includes special registers such as pc and fp saved in special
 271    ways in the stack frame.  sp is even more special:
 272    the address we return for it IS the sp for the next frame.  */
 273
 274 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 275 { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
 276
 277 \f
 278 /* Things needed for making the inferior call functions.  */
 279
 280 /* Push an empty stack frame, to record the current PC, etc.  */
 281
 282 #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
 283
 284 /* Discard from the stack the innermost frame, restoring all registers.  */
 285
 286 #define POP_FRAME  { i386_pop_frame (); }
 287
 288 /* this is
 289  *   call 11223344 (32 bit relative)
 290  *   int3
 291  */
 292
 293 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
 294
 295 #define CALL_DUMMY_LENGTH 8
 296
 297 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 298
 299 /* Insert the specified number of args and function address
 300    into a call sequence of the above form stored at DUMMYNAME.  */
 301
 302 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 303 { \
 304         *(int *)((char *)(dummyname) + 1) = (int)(fun) - (pc) - 5; \
 305 }