gdb/config/i386/tm-sun386.h

   1 /* Parameters for a Sun 386i target machine, for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1991, 1992, 1993 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 /* Avoid conflicts between our include files and <sys/exec.h>
  34    (maybe not needed anymore).  */
  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 extern int
  52 i386_skip_prologue PARAMS ((int));
  53
  54 /* Immediately after a function call, return the saved pc.
  55    Can't always go through the frames for this because on some machines
  56    the new frame is not set up until the new function executes
  57    some instructions.  */
  58
  59 #define SAVED_PC_AFTER_CALL(frame) \
  60   (read_memory_integer (read_register (SP_REGNUM), 4))
  61
  62 /* Address of end of stack space.  */
  63
  64 #define STACK_END_ADDR 0xfc000000
  65
  66 /* Stack grows downward.  */
  67
  68 #define INNER_THAN <
  69
  70 /* Sequence of bytes for breakpoint instruction.  */
  71
  72 #define BREAKPOINT {0xcc}
  73
  74 /* Amount PC must be decremented by after a breakpoint.
  75    This is often the number of bytes in BREAKPOINT
  76    but not always.  */
  77
  78 #define DECR_PC_AFTER_BREAK 1
  79
  80 /* Nonzero if instruction at PC is a return instruction.  */
  81
  82 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3)
  83
  84 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  85    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  86    real way to know how big a register is.  */
  87
  88 #define REGISTER_SIZE 4
  89
  90 /* Number of machine registers */
  91
  92 #define NUM_REGS 35
  93
  94 /* Initializer for an array of names of registers.
  95    There should be NUM_REGS strings in this initializer.  */
  96
  97 /* the order of the first 8 registers must match the compiler's
  98  * numbering scheme (which is the same as the 386 scheme)
  99  * also, this table must match regmap in i386-pinsn.c.
 100  */
 101 #define REGISTER_NAMES { "gs", "fs", "es", "ds",                \
 102                          "edi", "esi", "ebp", "esp",            \
 103                          "ebx", "edx", "ecx", "eax",            \
 104                          "retaddr", "trapnum", "errcode", "ip", \
 105                          "cs", "ps", "sp", "ss",                \
 106                          "fst0", "fst1", "fst2", "fst3",        \
 107                          "fst4", "fst5", "fst6", "fst7",        \
 108                          "fctrl", "fstat", "ftag", "fip",       \
 109                          "fcs", "fopoff", "fopsel"              \
 110                          }
 111
 112 /* Register numbers of various important registers.
 113    Note that some of these values are "real" register numbers,
 114    and correspond to the general registers of the machine,
 115    and some are "phony" register numbers which are too large
 116    to be actual register numbers as far as the user is concerned
 117    but do serve to get the desired values when passed to read_register.  */
 118
 119 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 120 #define SP_REGNUM 18            /* Contains address of top of stack */
 121 #define PS_REGNUM 17            /* Contains processor status */
 122 #define PC_REGNUM 15            /* Contains program counter */
 123 #define FP0_REGNUM 20           /* Floating point register 0 */
 124 #define FPC_REGNUM 28           /* 80387 control register */
 125
 126 /* Total amount of space needed to store our copies of the machine's
 127    register state, the array `registers'.  */
 128 #define REGISTER_BYTES (20*4+8*10+7*4)
 129
 130 /* Index within `registers' of the first byte of the space for
 131    register N.  */
 132
 133 #define REGISTER_BYTE(N) \
 134  ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160    \
 135   : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80  \
 136   : (N) * 4)
 137
 138 /* Number of bytes of storage in the actual machine representation
 139    for register N.  */
 140
 141 #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4)
 142
 143 /* Number of bytes of storage in the program's representation
 144    for register N. */
 145
 146 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4)
 147
 148 /* Largest value REGISTER_RAW_SIZE can have.  */
 149
 150 #define MAX_REGISTER_RAW_SIZE 10
 151
 152 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 153
 154 #define MAX_REGISTER_VIRTUAL_SIZE 8
 155
 156 /* Nonzero if register N requires conversion
 157    from raw format to virtual format.  */
 158
 159 #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8)
 160
 161 /* Convert data from raw format for register REGNUM in buffer FROM
 162    to virtual format with type TYPE in buffer TO.  */
 163
 164 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
 165 { \
 166   double val; \
 167   i387_to_double ((FROM), (char *)&val); \
 168   store_floating ((TO), TYPE_LENGTH (TYPE), val); \
 169 }
 170 extern void
 171 i387_to_double PARAMS ((char *, char *));
 172
 173 /* Convert data from virtual format with type TYPE in buffer FROM
 174    to raw format for register REGNUM in buffer TO.  */
 175
 176 #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
 177 { \
 178   double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
 179   double_to_i387((char *)&val, (TO)); \
 180 }
 181 extern void
 182 double_to_i387 PARAMS ((char *, char *));
 183
 184 /* Return the GDB type object for the "standard" data type
 185    of data in register N.  */
 186
 187 #define REGISTER_VIRTUAL_TYPE(N) \
 188  (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int)
 189
 190 /* Store the address of the place in which to copy the structure the
 191    subroutine will return.  This is called from call_function. */
 192
 193 #define STORE_STRUCT_RETURN(ADDR, SP) \
 194   { (SP) -= sizeof (ADDR);              \
 195     write_memory ((SP), &(ADDR), sizeof (ADDR)); }
 196
 197 /* Extract from an array REGBUF containing the (raw) register state
 198    a function return value of type TYPE, and copy that, in virtual format,
 199    into VALBUF.  */
 200
 201 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 202   memcpy (VALBUF, REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), TYPE_LENGTH (TYPE))
 203
 204 /* Write into appropriate registers a function return value
 205    of type TYPE, given in virtual format.  */
 206
 207 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 208   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 209
 210 /* Extract from an array REGBUF containing the (raw) register state
 211    the address in which a function should return its structure value,
 212    as a CORE_ADDR (or an expression that can be used as one).  */
 213
 214 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 215 \f
 216 /* Describe the pointer in each stack frame to the previous stack frame
 217    (its caller).  */
 218
 219 /* FRAME_CHAIN takes a frame's nominal address
 220    and produces the frame's chain-pointer. */
 221
 222 #define FRAME_CHAIN(thisframe) \
 223   (!inside_entry_file ((thisframe)->pc) ? \
 224    read_memory_integer ((thisframe)->frame, 4) :\
 225    0)
 226
 227 /* Define other aspects of the stack frame.  */
 228
 229 /* A macro that tells us whether the function invocation represented
 230    by FI does not have a frame on the stack associated with it.  If it
 231    does not, FRAMELESS is set to 1, else 0.  */
 232 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 233 { (FRAMELESS) = frameless_look_for_prologue (FI); }
 234
 235 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 236
 237 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 238
 239 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 240
 241 /* Return number of args passed to a frame.
 242    Can return -1, meaning no way to tell.  */
 243
 244 #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
 245
 246 #ifdef __STDC__         /* Forward decl's for prototypes */
 247 struct frame_info;
 248 struct frame_saved_regs;
 249 #endif
 250
 251 extern int
 252 i386_frame_num_args PARAMS ((struct frame_info *));
 253
 254 /* Return number of bytes at start of arglist that are not really args.  */
 255
 256 #define FRAME_ARGS_SKIP 8
 257
 258 /* Put here the code to store, into a struct frame_saved_regs,
 259    the addresses of the saved registers of frame described by FRAME_INFO.
 260    This includes special registers such as pc and fp saved in special
 261    ways in the stack frame.  sp is even more special:
 262    the address we return for it IS the sp for the next frame.  */
 263
 264 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 265 { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
 266
 267 extern void
 268 i386_frame_find_saved_regs PARAMS ((struct frame_info *,
 269                                     struct frame_saved_regs *));
 270
 271 \f
 272 /* Things needed for making the inferior call functions.  */
 273
 274 /* Push an empty stack frame, to record the current PC, etc.  */
 275
 276 #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
 277
 278 extern void
 279 i386_push_dummy_frame PARAMS ((void));
 280
 281 /* Discard from the stack the innermost frame, restoring all registers.  */
 282
 283 #define POP_FRAME  { i386_pop_frame (); }
 284
 285 extern void
 286 i386_pop_frame PARAMS ((void));
 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 }