gdb/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., 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 /* 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 /* Return 1 if P points to an invalid floating point value.
  85    LEN is the length in bytes -- not relevant on the 386.  */
  86
  87 #define INVALID_FLOAT(p, len) (0)
  88
  89 /* Largest integer type */
  90 #define LONGEST long
  91
  92 /* Name of the builtin type for the LONGEST type above. */
  93 #define BUILTIN_TYPE_LONGEST builtin_type_long
  94
  95 /* Say how long (ordinary) registers are.  */
  96
  97 #define REGISTER_TYPE long
  98
  99 /* Number of machine registers */
 100
 101 #define NUM_REGS 35
 102
 103 /* Initializer for an array of names of registers.
 104    There should be NUM_REGS strings in this initializer.  */
 105
 106 /* the order of the first 8 registers must match the compiler's
 107  * numbering scheme (which is the same as the 386 scheme)
 108  * also, this table must match regmap in i386-pinsn.c.
 109  */
 110 #define REGISTER_NAMES { "gs", "fs", "es", "ds",                \
 111                          "edi", "esi", "ebp", "esp",            \
 112                          "ebx", "edx", "ecx", "eax",            \
 113                          "retaddr", "trapnum", "errcode", "ip", \
 114                          "cs", "ps", "sp", "ss",                \
 115                          "fst0", "fst1", "fst2", "fst3",        \
 116                          "fst4", "fst5", "fst6", "fst7",        \
 117                          "fctrl", "fstat", "ftag", "fip",       \
 118                          "fcs", "fopoff", "fopsel"              \
 119                          }
 120
 121 /* Register numbers of various important registers.
 122    Note that some of these values are "real" register numbers,
 123    and correspond to the general registers of the machine,
 124    and some are "phony" register numbers which are too large
 125    to be actual register numbers as far as the user is concerned
 126    but do serve to get the desired values when passed to read_register.  */
 127
 128 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 129 #define SP_REGNUM 18            /* Contains address of top of stack */
 130 #define PS_REGNUM 17            /* Contains processor status */
 131 #define PC_REGNUM 15            /* Contains program counter */
 132 #define FP0_REGNUM 20           /* Floating point register 0 */
 133 #define FPC_REGNUM 28           /* 80387 control register */
 134
 135 /* Total amount of space needed to store our copies of the machine's
 136    register state, the array `registers'.  */
 137 #define REGISTER_BYTES (20*4+8*10+7*4)
 138
 139 /* Index within `registers' of the first byte of the space for
 140    register N.  */
 141
 142 #define REGISTER_BYTE(N) \
 143  ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160    \
 144   : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80  \
 145   : (N) * 4)
 146
 147 /* Number of bytes of storage in the actual machine representation
 148    for register N.  */
 149
 150 #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4)
 151
 152 /* Number of bytes of storage in the program's representation
 153    for register N. */
 154
 155 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4)
 156
 157 /* Largest value REGISTER_RAW_SIZE can have.  */
 158
 159 #define MAX_REGISTER_RAW_SIZE 10
 160
 161 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 162
 163 #define MAX_REGISTER_VIRTUAL_SIZE 8
 164
 165 /* Nonzero if register N requires conversion
 166    from raw format to virtual format.  */
 167
 168 #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8)
 169
 170 /* Convert data from raw format for register REGNUM
 171    to virtual format for register REGNUM.  */
 172
 173 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 174 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 175     i387_to_double ((FROM), (TO));                      \
 176   else                                                  \
 177     bcopy ((FROM), (TO), 4); }
 178
 179 extern void
 180 i387_to_double PARAMS ((char *, char *));
 181
 182 /* Convert data from virtual format for register REGNUM
 183    to raw format for register REGNUM.  */
 184
 185 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)         \
 186 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 187     double_to_i387 ((FROM), (TO));      \
 188   else                                  \
 189     bcopy ((FROM), (TO), 4); }
 190
 191 extern void
 192 double_to_i387 PARAMS ((char *, char *));
 193
 194 /* Return the GDB type object for the "standard" data type
 195    of data in register N.  */
 196
 197 #define REGISTER_VIRTUAL_TYPE(N) \
 198  (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int)
 199
 200 /* Store the address of the place in which to copy the structure the
 201    subroutine will return.  This is called from call_function. */
 202
 203 #define STORE_STRUCT_RETURN(ADDR, SP) \
 204   { (SP) -= sizeof (ADDR);              \
 205     write_memory ((SP), &(ADDR), sizeof (ADDR)); }
 206
 207 /* Extract from an array REGBUF containing the (raw) register state
 208    a function return value of type TYPE, and copy that, in virtual format,
 209    into VALBUF.  */
 210
 211 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 212   bcopy (REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 213
 214 /* Write into appropriate registers a function return value
 215    of type TYPE, given in virtual format.  */
 216
 217 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 218   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 219
 220 /* Extract from an array REGBUF containing the (raw) register state
 221    the address in which a function should return its structure value,
 222    as a CORE_ADDR (or an expression that can be used as one).  */
 223
 224 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 225 \f
 226 /* Describe the pointer in each stack frame to the previous stack frame
 227    (its caller).  */
 228
 229 /* FRAME_CHAIN takes a frame's nominal address
 230    and produces the frame's chain-pointer. */
 231
 232 #define FRAME_CHAIN(thisframe) \
 233   (!inside_entry_file ((thisframe)->pc) ? \
 234    read_memory_integer ((thisframe)->frame, 4) :\
 235    0)
 236
 237 /* Define other aspects of the stack frame.  */
 238
 239 /* A macro that tells us whether the function invocation represented
 240    by FI does not have a frame on the stack associated with it.  If it
 241    does not, FRAMELESS is set to 1, else 0.  */
 242 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 243 { (FRAMELESS) = frameless_look_for_prologue (FI); }
 244
 245 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 246
 247 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 248
 249 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 250
 251 /* Return number of args passed to a frame.
 252    Can return -1, meaning no way to tell.  */
 253
 254 #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
 255
 256 #ifdef __STDC__         /* Forward decl's for prototypes */
 257 struct frame_info;
 258 struct frame_saved_regs;
 259 #endif
 260
 261 extern int
 262 i386_frame_num_args PARAMS ((struct frame_info *));
 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 extern void
 278 i386_frame_find_saved_regs PARAMS ((struct frame_info *,
 279                                     struct frame_saved_regs *));
 280
 281 \f
 282 /* Things needed for making the inferior call functions.  */
 283
 284 /* Push an empty stack frame, to record the current PC, etc.  */
 285
 286 #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
 287
 288 extern void
 289 i386_push_dummy_frame PARAMS ((void));
 290
 291 /* Discard from the stack the innermost frame, restoring all registers.  */
 292
 293 #define POP_FRAME  { i386_pop_frame (); }
 294
 295 extern void
 296 i386_pop_frame PARAMS ((void));
 297
 298 /* this is
 299  *   call 11223344 (32 bit relative)
 300  *   int3
 301  */
 302
 303 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
 304
 305 #define CALL_DUMMY_LENGTH 8
 306
 307 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 308
 309 /* Insert the specified number of args and function address
 310    into a call sequence of the above form stored at DUMMYNAME.  */
 311
 312 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 313 { \
 314         *(int *)((char *)(dummyname) + 1) = (int)(fun) - (pc) - 5; \
 315 }