gdb/tm-merlin.h

   1 /* Definitions to target GDB to a merlin under utek 2.1
   2    Copyright 1986, 1987, 1989, 1991, 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 /* Offset from address of function to start of its code.
  23    Zero on most machines.  */
  24
  25 #define FUNCTION_START_OFFSET 0
  26
  27 /* Advance PC across any function entry prologue instructions
  28    to reach some "real" code.  */
  29
  30 #define SKIP_PROLOGUE(pc)                               \
  31 { register int op = read_memory_integer (pc, 1);        \
  32   if (op == 0x82)                                       \
  33     { op = read_memory_integer (pc+2,1);                \
  34       if ((op & 0x80) == 0) pc += 3;                    \
  35       else if ((op & 0xc0) == 0x80) pc += 4;            \
  36       else pc += 6;                                     \
  37     }}
  38
  39 /* Immediately after a function call, return the saved pc.
  40    Can't always go through the frames for this because on some machines
  41    the new frame is not set up until the new function executes
  42    some instructions.  */
  43
  44 #define SAVED_PC_AFTER_CALL(frame) \
  45         read_memory_integer (read_register (SP_REGNUM), 4)
  46
  47 /* Address of end of stack space.  */
  48
  49 #define STACK_END_ADDR (0x800000)
  50
  51 /* Stack grows downward.  */
  52
  53 #define INNER_THAN <
  54
  55 /* Sequence of bytes for breakpoint instruction.  */
  56
  57 #define BREAKPOINT {0xf2}
  58
  59 /* Amount PC must be decremented by after a breakpoint.
  60    This is often the number of bytes in BREAKPOINT
  61    but not always.  */
  62
  63 #define DECR_PC_AFTER_BREAK 0
  64
  65 /* Nonzero if instruction at PC is a return instruction.  */
  66
  67 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
  68
  69 /* Return 1 if P points to an invalid floating point value.  */
  70
  71 #define INVALID_FLOAT(p, len) 0
  72
  73 /* Define this to say that the "svc" insn is followed by
  74    codes in memory saying which kind of system call it is.  */
  75
  76 #define NS32K_SVC_IMMED_OPERANDS
  77
  78 /* Say how long (ordinary) registers are.  */
  79
  80 #define REGISTER_TYPE long
  81
  82 /* Number of machine registers */
  83
  84 #define NUM_REGS                25
  85
  86 #define NUM_GENERAL_REGS        8
  87
  88 /* Initializer for an array of names of registers.
  89    There should be NUM_REGS strings in this initializer.  */
  90
  91 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
  92                         "pc", "sp", "fp", "ps",                         \
  93                         "fsr",                                          \
  94                         "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
  95                         "l0", "l1", "l2", "l3", "l4",                   \
  96                         }
  97
  98 /* Register numbers of various important registers.
  99    Note that some of these values are "real" register numbers,
 100    and correspond to the general registers of the machine,
 101    and some are "phony" register numbers which are too large
 102    to be actual register numbers as far as the user is concerned
 103    but do serve to get the desired values when passed to read_register.  */
 104
 105 #define AP_REGNUM FP_REGNUM
 106 #define FP_REGNUM 10            /* Contains address of executing stack frame */
 107 #define SP_REGNUM 9             /* Contains address of top of stack */
 108 #define PC_REGNUM 8             /* Contains program counter */
 109 #define PS_REGNUM 11            /* Contains processor status */
 110 #define FPS_REGNUM 12           /* Floating point status register */
 111 #define FP0_REGNUM 13           /* Floating point register 0 */
 112 #define LP0_REGNUM 21           /* Double register 0 (same as FP0) */
 113
 114 /* Total amount of space needed to store our copies of the machine's
 115    register state, the array `registers'.  */
 116 #define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
 117
 118 /* Index within `registers' of the first byte of the space for
 119    register N.  */
 120
 121 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
 122         LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
 123
 124 /* Number of bytes of storage in the actual machine representation
 125    for register N.  On the 32000, all regs are 4 bytes
 126    except for the doubled floating registers. */
 127
 128 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 129
 130 /* Number of bytes of storage in the program's representation
 131    for register N.  On the 32000, all regs are 4 bytes
 132    except for the doubled floating registers. */
 133
 134 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 135
 136 /* Largest value REGISTER_RAW_SIZE can have.  */
 137
 138 #define MAX_REGISTER_RAW_SIZE 8
 139
 140 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 141
 142 #define MAX_REGISTER_VIRTUAL_SIZE 8
 143
 144 /* Nonzero if register N requires conversion
 145    from raw format to virtual format.  */
 146
 147 #define REGISTER_CONVERTIBLE(N) 0
 148
 149 /* Convert data from raw format for register REGNUM
 150    to virtual format for register REGNUM.  */
 151
 152 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 153   bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
 154
 155 /* Convert data from virtual format for register REGNUM
 156    to raw format for register REGNUM.  */
 157
 158 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 159   bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
 160
 161 /* Return the GDB type object for the "standard" data type
 162    of data in register N.  */
 163
 164 #define REGISTER_VIRTUAL_TYPE(N) \
 165   ((N) >= FP0_REGNUM ?          \
 166     ((N) >= LP0_REGNUM ?        \
 167      builtin_type_double        \
 168      : builtin_type_float)      \
 169    : builtin_type_int)
 170
 171 /* Store the address of the place in which to copy the structure the
 172    subroutine will return.  This is called from call_function.
 173
 174    On this machine this is a no-op, as gcc doesn't run on it yet.
 175    This calling convention is not used. */
 176
 177 #define STORE_STRUCT_RETURN(ADDR, SP)
 178
 179 /* Extract from an array REGBUF containing the (raw) register state
 180    a function return value of type TYPE, and copy that, in virtual format,
 181    into VALBUF.  */
 182
 183 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 184   bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
 185
 186 /* Write into appropriate registers a function return value
 187    of type TYPE, given in virtual format.  */
 188
 189 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 190   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 191
 192 /* Extract from an array REGBUF containing the (raw) register state
 193    the address in which a function should return its structure value,
 194    as a CORE_ADDR (or an expression that can be used as one).  */
 195
 196 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 197 \f
 198 /* Describe the pointer in each stack frame to the previous stack frame
 199    (its caller).  */
 200
 201 /* FRAME_CHAIN takes a frame's nominal address
 202    and produces the frame's chain-pointer. */
 203
 204 /* In the case of the Merlin, the frame's nominal address is the FP value,
 205    and at that address is saved previous FP value as a 4-byte word.  */
 206
 207 #define FRAME_CHAIN(thisframe)  \
 208   (!inside_entry_file ((thisframe)->pc) ? \
 209    read_memory_integer ((thisframe)->frame, 4) :\
 210    0)
 211
 212 /* Define other aspects of the stack frame.  */
 213
 214 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 215
 216 /* compute base of arguments */
 217 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 218
 219 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 220
 221 /* Return number of args passed to a frame.
 222    Can return -1, meaning no way to tell.  */
 223
 224 #define FRAME_NUM_ARGS(numargs, fi)                     \
 225 { CORE_ADDR pc;                                         \
 226   int insn;                                             \
 227   int addr_mode;                                        \
 228   int width;                                            \
 229                                                         \
 230   pc = FRAME_SAVED_PC (fi);                             \
 231   insn = read_memory_integer (pc,2);                    \
 232   addr_mode = (insn >> 11) & 0x1f;                      \
 233   insn = insn & 0x7ff;                                  \
 234   if ((insn & 0x7fc) == 0x57c                           \
 235       && addr_mode == 0x14) /* immediate */             \
 236     { if (insn == 0x57c) /* adjspb */                   \
 237         width = 1;                                      \
 238       else if (insn == 0x57d) /* adjspw */              \
 239         width = 2;                                      \
 240       else if (insn == 0x57f) /* adjspd */              \
 241         width = 4;                                      \
 242       numargs = read_memory_integer (pc+2,width);       \
 243       if (width > 1)                                    \
 244         flip_bytes (&numargs, width);                   \
 245       numargs = - sign_extend (numargs, width*8) / 4; } \
 246   else numargs = -1;                                    \
 247 }
 248
 249 /* Return number of bytes at start of arglist that are not really args.  */
 250
 251 #define FRAME_ARGS_SKIP 8
 252
 253 /* Put here the code to store, into a struct frame_saved_regs,
 254    the addresses of the saved registers of frame described by FRAME_INFO.
 255    This includes special registers such as pc and fp saved in special
 256    ways in the stack frame.  sp is even more special:
 257    the address we return for it IS the sp for the next frame.  */
 258
 259 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 260 { int regmask,regnum;                                           \
 261   int localcount;                                               \
 262   CORE_ADDR enter_addr;                                         \
 263   CORE_ADDR next_addr;                                          \
 264                                                                 \
 265   enter_addr = get_pc_function_start ((frame_info)->pc);        \
 266   regmask = read_memory_integer (enter_addr+1, 1);              \
 267   localcount = ns32k_localcount (enter_addr);                   \
 268   next_addr = (frame_info)->frame + localcount;                 \
 269   for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)         \
 270     (frame_saved_regs).regs[regnum]                             \
 271       = (regmask & 1) ? (next_addr -= 4) : 0;                   \
 272   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
 273   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
 274   (frame_saved_regs).regs[FP_REGNUM]                            \
 275      = read_memory_integer ((frame_info)->frame, 4); }
 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 \
 283 { register CORE_ADDR sp = read_register (SP_REGNUM);    \
 284   register int regnum;                                  \
 285   sp = push_word (sp, read_register (PC_REGNUM));       \
 286   sp = push_word (sp, read_register (FP_REGNUM));       \
 287   write_register (FP_REGNUM, sp);                       \
 288   for (regnum = 0; regnum < 8; regnum++)                \
 289     sp = push_word (sp, read_register (regnum));        \
 290   write_register (SP_REGNUM, sp);                       \
 291 }
 292
 293 /* Discard from the stack the innermost frame, restoring all registers.  */
 294
 295 #define POP_FRAME  \
 296 { register FRAME frame = get_current_frame ();                   \
 297   register CORE_ADDR fp;                                         \
 298   register int regnum;                                           \
 299   struct frame_saved_regs fsr;                                   \
 300   struct frame_info *fi;                                                 \
 301   fi = get_frame_info (frame);                                   \
 302   fp = fi->frame;                                                \
 303   get_frame_saved_regs (fi, &fsr);                               \
 304   for (regnum = 0; regnum < 8; regnum++)                         \
 305     if (fsr.regs[regnum])                                        \
 306       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 307   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 308   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 309   write_register (SP_REGNUM, fp + 8);                            \
 310   flush_cached_frames ();                                        \
 311   set_current_frame (create_new_frame (read_register (FP_REGNUM),\
 312                                        read_pc ()));             \
 313 }
 314
 315 /* This sequence of words is the instructions
 316      enter      0xff,0          82 ff 00
 317      jsr        @0x00010203     7f ae c0 01 02 03
 318      adjspd     0x69696969      7f a5 01 02 03 04
 319      bpt                        f2
 320    Note this is 16 bytes.  */
 321
 322 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
 323
 324 #define CALL_DUMMY_START_OFFSET 3
 325 #define CALL_DUMMY_LENGTH       16
 326 #define CALL_DUMMY_ADDR         5
 327 #define CALL_DUMMY_NARGS        11
 328
 329 /* Insert the specified number of args and function address
 330    into a call sequence of the above form stored at DUMMYNAME.  */
 331
 332 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)            \
 333 { int flipped = fun | 0xc0000000;                               \
 334   flip_bytes (&flipped, 4);                                     \
 335   *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;  \
 336   flipped = - nargs * 4;                                        \
 337   flip_bytes (&flipped, 4);                                     \
 338   *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
 339 }