gdb/tm-sun386.h

   1 /* Parameters for execution on a Sun 386i, for GDB, the GNU debugger.
   2    Copyright (C) 1986, 1987, 1991 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., 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 GDB_TARGET_IS_SUN386 1
  26 #define SUNOS4
  27 #define USE_MACHINE_REG_H
  28
  29 /* Perhaps some day this will work even without the following #define */
  30 #define COFF_ENCAPSULATE
  31
  32 #ifdef COFF_ENCAPSULATE
  33 #define NAMES_HAVE_UNDERSCORE
  34 /* Avoid conflicts between "a.out.gnu.h" and <sys/exec.h> */
  35 #define _EXEC_
  36 #endif
  37
  38 /* sun386 ptrace seems unable to change the frame pointer */
  39 #define PTRACE_FP_BUG
  40
  41 /* Offset from address of function to start of its code.
  42    Zero on most machines.  */
  43
  44 #define FUNCTION_START_OFFSET 0
  45
  46 /* Advance PC across any function entry prologue instructions
  47    to reach some "real" code.  */
  48
  49 #define SKIP_PROLOGUE(frompc)   {(frompc) = i386_skip_prologue((frompc));}
  50
  51 /* Immediately after a function call, return the saved pc.
  52    Can't always go through the frames for this because on some machines
  53    the new frame is not set up until the new function executes
  54    some instructions.  */
  55
  56 #define SAVED_PC_AFTER_CALL(frame) \
  57   (read_memory_integer (read_register (SP_REGNUM), 4))
  58
  59 /* Address of end of stack space.  */
  60
  61 #define STACK_END_ADDR 0xfc000000
  62
  63 /* Stack grows downward.  */
  64
  65 #define INNER_THAN <
  66
  67 /* Sequence of bytes for breakpoint instruction.  */
  68
  69 #define BREAKPOINT {0xcc}
  70
  71 /* Amount PC must be decremented by after a breakpoint.
  72    This is often the number of bytes in BREAKPOINT
  73    but not always.  */
  74
  75 #define DECR_PC_AFTER_BREAK 1
  76
  77 /* Nonzero if instruction at PC is a return instruction.  */
  78
  79 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3)
  80
  81 /* Return 1 if P points to an invalid floating point value.
  82    LEN is the length in bytes -- not relevant on the 386.  */
  83
  84 #define INVALID_FLOAT(p, len) (0)
  85
  86 /* Largest integer type */
  87 #define LONGEST long
  88
  89 /* Name of the builtin type for the LONGEST type above. */
  90 #define BUILTIN_TYPE_LONGEST builtin_type_long
  91
  92 /* Say how long (ordinary) registers are.  */
  93
  94 #define REGISTER_TYPE long
  95
  96 /* Number of machine registers */
  97
  98 #define NUM_REGS 35
  99
 100 /* Initializer for an array of names of registers.
 101    There should be NUM_REGS strings in this initializer.  */
 102
 103 /* the order of the first 8 registers must match the compiler's
 104  * numbering scheme (which is the same as the 386 scheme)
 105  * also, this table must match regmap in i386-pinsn.c.
 106  */
 107 #define REGISTER_NAMES { "gs", "fs", "es", "ds",                \
 108                          "edi", "esi", "ebp", "esp",            \
 109                          "ebx", "edx", "ecx", "eax",            \
 110                          "retaddr", "trapnum", "errcode", "ip", \
 111                          "cs", "ps", "sp", "ss",                \
 112                          "fst0", "fst1", "fst2", "fst3",        \
 113                          "fst4", "fst5", "fst6", "fst7",        \
 114                          "fctrl", "fstat", "ftag", "fip",       \
 115                          "fcs", "fopoff", "fopsel"              \
 116                          }
 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 FP_REGNUM 6             /* Contains address of executing stack frame */
 126 #define SP_REGNUM 18            /* Contains address of top of stack */
 127 #define PS_REGNUM 17            /* Contains processor status */
 128 #define PC_REGNUM 15            /* Contains program counter */
 129 #define FP0_REGNUM 20           /* Floating point register 0 */
 130 #define FPC_REGNUM 28           /* 80387 control register */
 131
 132 /* Total amount of space needed to store our copies of the machine's
 133    register state, the array `registers'.  */
 134 #define REGISTER_BYTES (20*4+8*10+7*4)
 135
 136 /* Index within `registers' of the first byte of the space for
 137    register N.  */
 138
 139 #define REGISTER_BYTE(N) \
 140  ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160    \
 141   : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80  \
 142   : (N) * 4)
 143
 144 /* Number of bytes of storage in the actual machine representation
 145    for register N.  */
 146
 147 #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4)
 148
 149 /* Number of bytes of storage in the program's representation
 150    for register N. */
 151
 152 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4)
 153
 154 /* Largest value REGISTER_RAW_SIZE can have.  */
 155
 156 #define MAX_REGISTER_RAW_SIZE 10
 157
 158 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 159
 160 #define MAX_REGISTER_VIRTUAL_SIZE 8
 161
 162 /* Nonzero if register N requires conversion
 163    from raw format to virtual format.  */
 164
 165 #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8)
 166
 167 /* Convert data from raw format for register REGNUM
 168    to virtual format for register REGNUM.  */
 169
 170 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 171 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 172     i387_to_double ((FROM), (TO));                      \
 173   else                                                  \
 174     bcopy ((FROM), (TO), 4); }
 175
 176 /* Convert data from virtual format for register REGNUM
 177    to raw format for register REGNUM.  */
 178
 179 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)         \
 180 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 181     double_to_i387 ((FROM), (TO));      \
 182   else                                  \
 183     bcopy ((FROM), (TO), 4); }
 184
 185 /* Return the GDB type object for the "standard" data type
 186    of data in register N.  */
 187
 188 #define REGISTER_VIRTUAL_TYPE(N) \
 189  (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int)
 190
 191 /* Store the address of the place in which to copy the structure the
 192    subroutine will return.  This is called from call_function. */
 193
 194 #define STORE_STRUCT_RETURN(ADDR, SP) \
 195   { (SP) -= sizeof (ADDR);              \
 196     write_memory ((SP), &(ADDR), sizeof (ADDR)); }
 197
 198 /* Extract from an array REGBUF containing the (raw) register state
 199    a function return value of type TYPE, and copy that, in virtual format,
 200    into VALBUF.  */
 201
 202 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 203   bcopy (REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 204
 205 /* Write into appropriate registers a function return value
 206    of type TYPE, given in virtual format.  */
 207
 208 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 209   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 210
 211 /* Extract from an array REGBUF containing the (raw) register state
 212    the address in which a function should return its structure value,
 213    as a CORE_ADDR (or an expression that can be used as one).  */
 214
 215 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 216 \f
 217 /* Describe the pointer in each stack frame to the previous stack frame
 218    (its caller).  */
 219
 220 /* FRAME_CHAIN takes a frame's nominal address
 221    and produces the frame's chain-pointer.
 222
 223    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 224    and produces the nominal address of the caller frame.
 225
 226    However, if FRAME_CHAIN_VALID returns zero,
 227    it means the given frame is the outermost one and has no caller.
 228    In that case, FRAME_CHAIN_COMBINE is not used.  */
 229
 230 #define FRAME_CHAIN(thisframe) \
 231   (outside_startup_file ((thisframe)->pc) ? \
 232    read_memory_integer ((thisframe)->frame, 4) :\
 233    0)
 234
 235 #define FRAME_CHAIN_VALID(chain, thisframe) \
 236   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 237
 238 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 239
 240 /* Define other aspects of the stack frame.  */
 241
 242 /* A macro that tells us whether the function invocation represented
 243    by FI does not have a frame on the stack associated with it.  If it
 244    does not, FRAMELESS is set to 1, else 0.  */
 245 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 246 { (FRAMELESS) = frameless_look_for_prologue (FI); }
 247
 248 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 249
 250 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 251
 252 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 253
 254 /* Return number of args passed to a frame.
 255    Can return -1, meaning no way to tell.  */
 256
 257 #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
 258
 259 /* Return number of bytes at start of arglist that are not really args.  */
 260
 261 #define FRAME_ARGS_SKIP 8
 262
 263 /* Put here the code to store, into a struct frame_saved_regs,
 264    the addresses of the saved registers of frame described by FRAME_INFO.
 265    This includes special registers such as pc and fp saved in special
 266    ways in the stack frame.  sp is even more special:
 267    the address we return for it IS the sp for the next frame.  */
 268
 269 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 270 { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
 271
 272 \f
 273 /* Things needed for making the inferior call functions.  */
 274
 275 /* Push an empty stack frame, to record the current PC, etc.  */
 276
 277 #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
 278
 279 /* Discard from the stack the innermost frame, restoring all registers.  */
 280
 281 #define POP_FRAME  { i386_pop_frame (); }
 282
 283 /* this is
 284  *   call 11223344 (32 bit relative)
 285  *   int3
 286  */
 287
 288 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
 289
 290 #define CALL_DUMMY_LENGTH 8
 291
 292 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 293
 294 /* Insert the specified number of args and function address
 295    into a call sequence of the above form stored at DUMMYNAME.  */
 296
 297 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 298 { \
 299         *(int *)((char *)(dummyname) + 1) = (int)(fun) - (pc) - 5; \
 300 }