gdb/config/ns32k/tm-umax.h

   1 /* Definitions to make GDB run on an encore under umax 4.2
   2    Copyright 1987, 1989, 1991, 1993, 1994, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "regcache.h"
  23
  24 /* This is also included by tm-ns32km3.h, as well as being used by umax.  */
  25
  26 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
  27
  28 /* Need to get function ends by adding this to epilogue address from .bf
  29    record, not using x_fsize field.  */
  30 #define FUNCTION_EPILOGUE_SIZE 4
  31
  32 /* Offset from address of function to start of its code.
  33    Zero on most machines.  */
  34
  35 #define FUNCTION_START_OFFSET 0
  36
  37 /* Advance PC across any function entry prologue instructions
  38    to reach some "real" code.  */
  39
  40 extern CORE_ADDR umax_skip_prologue (CORE_ADDR);
  41 #define SKIP_PROLOGUE(pc) (umax_skip_prologue (pc))
  42
  43 /* Immediately after a function call, return the saved pc.
  44    Can't always go through the frames for this because on some machines
  45    the new frame is not set up until the new function executes
  46    some instructions.  */
  47
  48 #define SAVED_PC_AFTER_CALL(frame) \
  49         read_memory_integer (read_register (SP_REGNUM), 4)
  50
  51 /* Address of end of stack space.  */
  52
  53 #ifndef STACK_END_ADDR
  54 #define STACK_END_ADDR (0xfffff000)
  55 #endif
  56
  57 /* Stack grows downward.  */
  58
  59 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  60
  61 /* Sequence of bytes for breakpoint instruction.  */
  62
  63 #define BREAKPOINT {0xf2}
  64
  65 /* Amount PC must be decremented by after a breakpoint.
  66    This is often the number of bytes in BREAKPOINT
  67    but not always.  */
  68
  69 #define DECR_PC_AFTER_BREAK 0
  70
  71 #if 0                           /* Disable until fixed *correctly*.  */
  72 #ifndef INVALID_FLOAT
  73 #ifndef NaN
  74 #include <nan.h>
  75 #endif /* NaN */
  76
  77 /* Return 1 if P points to an invalid floating point value.  */
  78 /* Surely wrong for cross-debugging.  */
  79 #define INVALID_FLOAT(p, s) \
  80          ((s == sizeof (float))?        \
  81                 NaF (*(float *) p) :    \
  82                 NaD (*(double *) p))
  83 #endif /* INVALID_FLOAT */
  84 #endif
  85
  86 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  87    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  88    real way to know how big a register is.  */
  89
  90 #define REGISTER_SIZE 4
  91
  92 /* Number of machine registers */
  93
  94 #define NUM_REGS                25
  95
  96 #define NUM_GENERAL_REGS        8
  97
  98 /* Initializer for an array of names of registers.
  99    There should be NUM_REGS strings in this initializer.  */
 100
 101 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
 102                         "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
 103                         "sp", "fp", "pc", "ps",                         \
 104                         "fsr",                                          \
 105                         "l0", "l1", "l2", "l3", "xx",                   \
 106                         }
 107
 108 /* Register numbers of various important registers.
 109    Note that some of these values are "real" register numbers,
 110    and correspond to the general registers of the machine,
 111    and some are "phony" register numbers which are too large
 112    to be actual register numbers as far as the user is concerned
 113    but do serve to get the desired values when passed to read_register.  */
 114
 115 #define R0_REGNUM 0             /* General register 0 */
 116 #define FP0_REGNUM 8            /* Floating point register 0 */
 117 #define SP_REGNUM 16            /* Contains address of top of stack */
 118 #define AP_REGNUM FP_REGNUM
 119 #define FP_REGNUM 17            /* Contains address of executing stack frame */
 120 #define PC_REGNUM 18            /* Contains program counter */
 121 #define PS_REGNUM 19            /* Contains processor status */
 122 #define FPS_REGNUM 20           /* Floating point status register */
 123 #define LP0_REGNUM 21           /* Double register 0 (same as FP0) */
 124
 125 /* Total amount of space needed to store our copies of the machine's
 126    register state, the array `registers'.  */
 127 #define REGISTER_BYTES \
 128   ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
 129    + 4            * REGISTER_RAW_SIZE(LP0_REGNUM))
 130
 131 /* Index within `registers' of the first byte of the space for
 132    register N.  */
 133
 134 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
 135         LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
 136
 137 /* Number of bytes of storage in the actual machine representation
 138    for register N.  On the 32000, all regs are 4 bytes
 139    except for the doubled floating registers. */
 140
 141 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 142
 143 /* Number of bytes of storage in the program's representation
 144    for register N.  On the 32000, all regs are 4 bytes
 145    except for the doubled floating registers. */
 146
 147 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 148
 149 /* Largest value REGISTER_RAW_SIZE can have.  */
 150
 151 #define MAX_REGISTER_RAW_SIZE 8
 152
 153 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 154
 155 #define MAX_REGISTER_VIRTUAL_SIZE 8
 156
 157 /* Return the GDB type object for the "standard" data type
 158    of data in register N.  */
 159
 160 #define REGISTER_VIRTUAL_TYPE(N) \
 161         (((N) < FP0_REGNUM) ?                           \
 162                 builtin_type_int :                      \
 163                 ((N) < FP0_REGNUM + 8) ?                \
 164                         builtin_type_float :            \
 165                         ((N) < LP0_REGNUM) ?            \
 166                                 builtin_type_int :      \
 167                                 builtin_type_double)
 168
 169 /* Store the address of the place in which to copy the structure the
 170    subroutine will return.  This is called from call_function.
 171
 172    On this machine this is a no-op, because gcc isn't used on it
 173    yet.  So this calling convention is not used. */
 174
 175 #define STORE_STRUCT_RETURN(ADDR, SP)
 176
 177 /* Extract from an array REGBUF containing the (raw) register state
 178    a function return value of type TYPE, and copy that, in virtual format,
 179    into VALBUF.  */
 180
 181 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 182   memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE))
 183
 184 /* Write into appropriate registers a function return value
 185    of type TYPE, given in virtual format.  */
 186
 187 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 188   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
 189
 190 /* Extract from an array REGBUF containing the (raw) register state
 191    the address in which a function should return its structure value,
 192    as a CORE_ADDR (or an expression that can be used as one).  */
 193
 194 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 195 \f
 196 /* Describe the pointer in each stack frame to the previous stack frame
 197    (its caller).  */
 198
 199 /* FRAME_CHAIN takes a frame's nominal address
 200    and produces the frame's chain-pointer. */
 201
 202 /* In the case of the ns32000 series, the frame's nominal address is the FP
 203    value, and at that address is saved previous FP value as a 4-byte word.  */
 204
 205 #define FRAME_CHAIN(thisframe)  \
 206   (!inside_entry_file ((thisframe)->pc) ? \
 207    read_memory_integer ((thisframe)->frame, 4) :\
 208    0)
 209
 210 /* Define other aspects of the stack frame.  */
 211
 212 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 213
 214 /* Compute base of arguments. */
 215
 216 #define FRAME_ARGS_ADDRESS(fi)  \
 217   ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
 218         ((fi)->frame) : (read_register (SP_REGNUM) - 4))
 219
 220 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 221
 222 /* Get the address of the enter opcode for this function, if it is active.
 223    Returns positive address > 1 if pc is between enter/exit,
 224    1 if pc before enter or after exit, 0 otherwise. */
 225
 226 extern CORE_ADDR ns32k_get_enter_addr ();
 227
 228 /* Return number of args passed to a frame.
 229    Can return -1, meaning no way to tell.  */
 230
 231 extern int umax_frame_num_args (struct frame_info *fi);
 232 #define FRAME_NUM_ARGS(fi) (umax_frame_num_args ((fi)))
 233
 234 /* Return number of bytes at start of arglist that are not really args.  */
 235
 236 #define FRAME_ARGS_SKIP 8
 237
 238 /* Put here the code to store, into a struct frame_saved_regs,
 239    the addresses of the saved registers of frame described by FRAME_INFO.
 240    This includes special registers such as pc and fp saved in special
 241    ways in the stack frame.  sp is even more special:
 242    the address we return for it IS the sp for the next frame.  */
 243
 244 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)     \
 245 {                                                               \
 246   register int  regmask, regnum;                                \
 247   int           localcount;                                     \
 248   register CORE_ADDR    enter_addr;                             \
 249   register CORE_ADDR    next_addr;                              \
 250                                                                 \
 251   memset (&(frame_saved_regs), '\0', sizeof (frame_saved_regs));        \
 252   enter_addr = ns32k_get_enter_addr ((frame_info)->pc);         \
 253   if (enter_addr > 1)                                           \
 254     {                                                           \
 255       regmask = read_memory_integer (enter_addr+1, 1) & 0xff;   \
 256       localcount = ns32k_localcount (enter_addr);               \
 257       next_addr = (frame_info)->frame + localcount;             \
 258       for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)     \
 259         (frame_saved_regs).regs[regnum] = (regmask & 1) ?       \
 260                                           (next_addr -= 4) : 0; \
 261       (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
 262       (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
 263       (frame_saved_regs).regs[FP_REGNUM] =                      \
 264                   (read_memory_integer ((frame_info)->frame, 4));\
 265     }                                                           \
 266   else if (enter_addr == 1)                                     \
 267     {                                                           \
 268       CORE_ADDR sp = read_register (SP_REGNUM);                 \
 269       (frame_saved_regs).regs[PC_REGNUM] = sp;                  \
 270       (frame_saved_regs).regs[SP_REGNUM] = sp + 4;              \
 271     }                                                           \
 272 }
 273 \f
 274 /* Things needed for making the inferior call functions.  */
 275
 276 /* Push an empty stack frame, to record the current PC, etc.  */
 277
 278 #define PUSH_DUMMY_FRAME \
 279 { register CORE_ADDR sp = read_register (SP_REGNUM);\
 280   register int regnum;                              \
 281   sp = push_word (sp, read_register (PC_REGNUM));   \
 282   sp = push_word (sp, read_register (FP_REGNUM));   \
 283   write_register (FP_REGNUM, sp);                   \
 284   for (regnum = 0; regnum < 8; regnum++)  \
 285     sp = push_word (sp, read_register (regnum));    \
 286   write_register (SP_REGNUM, sp);                       \
 287 }
 288
 289 /* Discard from the stack the innermost frame, restoring all registers.  */
 290
 291 #define POP_FRAME  \
 292 { register struct frame_info *frame = get_current_frame ();      \
 293   register CORE_ADDR fp;                                         \
 294   register int regnum;                                           \
 295   struct frame_saved_regs fsr;                                   \
 296   struct frame_info *fi;                                                 \
 297   fp = frame->frame;                                             \
 298   get_frame_saved_regs (frame, &fsr);                            \
 299   for (regnum = 0; regnum < 8; regnum++)                         \
 300     if (fsr.regs[regnum])                                        \
 301       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 302   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 303   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 304   write_register (SP_REGNUM, fp + 8);                            \
 305   flush_cached_frames ();                                        \
 306 }
 307
 308 /* This sequence of words is the instructions
 309    enter        0xff,0          82 ff 00
 310    jsr  @0x00010203     7f ae c0 01 02 03
 311    adjspd       0x69696969      7f a5 01 02 03 04
 312    bpt                  f2
 313    Note this is 16 bytes.  */
 314
 315 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
 316
 317 #define CALL_DUMMY_START_OFFSET 3
 318 #define CALL_DUMMY_LENGTH       16
 319 #define CALL_DUMMY_ADDR         5
 320 #define CALL_DUMMY_NARGS        11
 321
 322 /* Insert the specified number of args and function address
 323    into a call sequence of the above form stored at DUMMYNAME.  */
 324
 325 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)            \
 326 {                                                               \
 327         int     flipped;                                        \
 328         flipped = fun | 0xc0000000;                             \
 329         flip_bytes (&flipped, 4);                               \
 330         *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;    \
 331         flipped = - nargs * 4;                                  \
 332         flip_bytes (&flipped, 4);                               \
 333         *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped;   \
 334 }