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 our include files and <sys/exec.h>
  35    (maybe not needed anymore).  */
  36 #define _EXEC_
  37 #endif
  38
  39 /* sun386 ptrace seems unable to change the frame pointer */
  40 #define PTRACE_FP_BUG
  41
  42 /* Offset from address of function to start of its code.
  43    Zero on most machines.  */
  44
  45 #define FUNCTION_START_OFFSET 0
  46
  47 /* Advance PC across any function entry prologue instructions
  48    to reach some "real" code.  */
  49
  50 #define SKIP_PROLOGUE(frompc)   {(frompc) = i386_skip_prologue((frompc));}
  51
  52 /* Immediately after a function call, return the saved pc.
  53    Can't always go through the frames for this because on some machines
  54    the new frame is not set up until the new function executes
  55    some instructions.  */
  56
  57 #define SAVED_PC_AFTER_CALL(frame) \
  58   (read_memory_integer (read_register (SP_REGNUM), 4))
  59
  60 /* Address of end of stack space.  */
  61
  62 #define STACK_END_ADDR 0xfc000000
  63
  64 /* Stack grows downward.  */
  65
  66 #define INNER_THAN <
  67
  68 /* Sequence of bytes for breakpoint instruction.  */
  69
  70 #define BREAKPOINT {0xcc}
  71
  72 /* Amount PC must be decremented by after a breakpoint.
  73    This is often the number of bytes in BREAKPOINT
  74    but not always.  */
  75
  76 #define DECR_PC_AFTER_BREAK 1
  77
  78 /* Nonzero if instruction at PC is a return instruction.  */
  79
  80 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3)
  81
  82 /* Return 1 if P points to an invalid floating point value.
  83    LEN is the length in bytes -- not relevant on the 386.  */
  84
  85 #define INVALID_FLOAT(p, len) (0)
  86
  87 /* Largest integer type */
  88 #define LONGEST long
  89
  90 /* Name of the builtin type for the LONGEST type above. */
  91 #define BUILTIN_TYPE_LONGEST builtin_type_long
  92
  93 /* Say how long (ordinary) registers are.  */
  94
  95 #define REGISTER_TYPE long
  96
  97 /* Number of machine registers */
  98
  99 #define NUM_REGS 35
 100
 101 /* Initializer for an array of names of registers.
 102    There should be NUM_REGS strings in this initializer.  */
 103
 104 /* the order of the first 8 registers must match the compiler's
 105  * numbering scheme (which is the same as the 386 scheme)
 106  * also, this table must match regmap in i386-pinsn.c.
 107  */
 108 #define REGISTER_NAMES { "gs", "fs", "es", "ds",                \
 109                          "edi", "esi", "ebp", "esp",            \
 110                          "ebx", "edx", "ecx", "eax",            \
 111                          "retaddr", "trapnum", "errcode", "ip", \
 112                          "cs", "ps", "sp", "ss",                \
 113                          "fst0", "fst1", "fst2", "fst3",        \
 114                          "fst4", "fst5", "fst6", "fst7",        \
 115                          "fctrl", "fstat", "ftag", "fip",       \
 116                          "fcs", "fopoff", "fopsel"              \
 117                          }
 118
 119 /* Register numbers of various important registers.
 120    Note that some of these values are "real" register numbers,
 121    and correspond to the general registers of the machine,
 122    and some are "phony" register numbers which are too large
 123    to be actual register numbers as far as the user is concerned
 124    but do serve to get the desired values when passed to read_register.  */
 125
 126 #define FP_REGNUM 6             /* Contains address of executing stack frame */
 127 #define SP_REGNUM 18            /* Contains address of top of stack */
 128 #define PS_REGNUM 17            /* Contains processor status */
 129 #define PC_REGNUM 15            /* Contains program counter */
 130 #define FP0_REGNUM 20           /* Floating point register 0 */
 131 #define FPC_REGNUM 28           /* 80387 control register */
 132
 133 /* Total amount of space needed to store our copies of the machine's
 134    register state, the array `registers'.  */
 135 #define REGISTER_BYTES (20*4+8*10+7*4)
 136
 137 /* Index within `registers' of the first byte of the space for
 138    register N.  */
 139
 140 #define REGISTER_BYTE(N) \
 141  ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160    \
 142   : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80  \
 143   : (N) * 4)
 144
 145 /* Number of bytes of storage in the actual machine representation
 146    for register N.  */
 147
 148 #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4)
 149
 150 /* Number of bytes of storage in the program's representation
 151    for register N. */
 152
 153 #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4)
 154
 155 /* Largest value REGISTER_RAW_SIZE can have.  */
 156
 157 #define MAX_REGISTER_RAW_SIZE 10
 158
 159 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 160
 161 #define MAX_REGISTER_VIRTUAL_SIZE 8
 162
 163 /* Nonzero if register N requires conversion
 164    from raw format to virtual format.  */
 165
 166 #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8)
 167
 168 /* Convert data from raw format for register REGNUM
 169    to virtual format for register REGNUM.  */
 170
 171 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 172 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 173     i387_to_double ((FROM), (TO));                      \
 174   else                                                  \
 175     bcopy ((FROM), (TO), 4); }
 176
 177 /* Convert data from virtual format for register REGNUM
 178    to raw format for register REGNUM.  */
 179
 180 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)         \
 181 { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)  \
 182     double_to_i387 ((FROM), (TO));      \
 183   else                                  \
 184     bcopy ((FROM), (TO), 4); }
 185
 186 /* Return the GDB type object for the "standard" data type
 187    of data in register N.  */
 188
 189 #define REGISTER_VIRTUAL_TYPE(N) \
 190  (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int)
 191
 192 /* Store the address of the place in which to copy the structure the
 193    subroutine will return.  This is called from call_function. */
 194
 195 #define STORE_STRUCT_RETURN(ADDR, SP) \
 196   { (SP) -= sizeof (ADDR);              \
 197     write_memory ((SP), &(ADDR), sizeof (ADDR)); }
 198
 199 /* Extract from an array REGBUF containing the (raw) register state
 200    a function return value of type TYPE, and copy that, in virtual format,
 201    into VALBUF.  */
 202
 203 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 204   bcopy (REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 205
 206 /* Write into appropriate registers a function return value
 207    of type TYPE, given in virtual format.  */
 208
 209 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 210   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE))
 211
 212 /* Extract from an array REGBUF containing the (raw) register state
 213    the address in which a function should return its structure value,
 214    as a CORE_ADDR (or an expression that can be used as one).  */
 215
 216 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 217 \f
 218 /* Describe the pointer in each stack frame to the previous stack frame
 219    (its caller).  */
 220
 221 /* FRAME_CHAIN takes a frame's nominal address
 222    and produces the frame's chain-pointer.
 223
 224    However, if FRAME_CHAIN_VALID returns zero,
 225    it means the given frame is the outermost one and has no caller.  */
 226
 227 #define FRAME_CHAIN(thisframe) \
 228   (outside_startup_file ((thisframe)->pc) ? \
 229    read_memory_integer ((thisframe)->frame, 4) :\
 230    0)
 231
 232 #define FRAME_CHAIN_VALID(chain, thisframe) \
 233   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 234
 235 /* Define other aspects of the stack frame.  */
 236
 237 /* A macro that tells us whether the function invocation represented
 238    by FI does not have a frame on the stack associated with it.  If it
 239    does not, FRAMELESS is set to 1, else 0.  */
 240 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 241 { (FRAMELESS) = frameless_look_for_prologue (FI); }
 242
 243 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 244
 245 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 246
 247 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 248
 249 /* Return number of args passed to a frame.
 250    Can return -1, meaning no way to tell.  */
 251
 252 #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
 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 \f
 268 /* Things needed for making the inferior call functions.  */
 269
 270 /* Push an empty stack frame, to record the current PC, etc.  */
 271
 272 #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
 273
 274 /* Discard from the stack the innermost frame, restoring all registers.  */
 275
 276 #define POP_FRAME  { i386_pop_frame (); }
 277
 278 /* this is
 279  *   call 11223344 (32 bit relative)
 280  *   int3
 281  */
 282
 283 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
 284
 285 #define CALL_DUMMY_LENGTH 8
 286
 287 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 288
 289 /* Insert the specified number of args and function address
 290    into a call sequence of the above form stored at DUMMYNAME.  */
 291
 292 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 293 { \
 294         *(int *)((char *)(dummyname) + 1) = (int)(fun) - (pc) - 5; \
 295 }