gdb/config/tahoe/tm-tahoe.h

   1 /* Definitions to make GDB target for a tahoe running 4.3-Reno.
   2    Copyright 1986, 1987, 1989, 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 /*
  21  * Ported by the State University of New York at Buffalo by the Distributed
  22  * Computer Systems Lab, Department of Computer Science, 1991.
  23  */
  24
  25 #define TARGET_BYTE_ORDER BIG_ENDIAN
  26 #define BITS_BIG_ENDIAN 0
  27
  28 /* Offset from address of function to start of its code.
  29    Zero on most machines.  */
  30
  31 #define FUNCTION_START_OFFSET 2
  32
  33 /* Advance PC across any function entry prologue instructions
  34    to reach some "real" code.  */
  35
  36 extern CORE_ADDR tahoe_skip_prologue PARAMS ((CORE_ADDR));
  37 #define SKIP_PROLOGUE(pc) (tahoe_skip_prologue (pc))
  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) FRAME_SAVED_PC(frame)
  45
  46 /* Wrong for cross-debugging.  I don't know the real values.  */
  47 #include <machine/param.h>
  48 #define TARGET_UPAGES UPAGES
  49 #define TARGET_NBPG NBPG
  50
  51 /* Address of end of stack space.  */
  52
  53 #define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
  54
  55 /* On BSD, sigtramp is in the u area.  Can't check the exact
  56    addresses because for cross-debugging we don't have target include
  57    files around.  This should be close enough.  */
  58 #define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
  59
  60 /* Stack grows downward.  */
  61
  62 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  63
  64 /* Sequence of bytes for breakpoint instruction.  */
  65
  66 #define BREAKPOINT {0x30}
  67
  68 /* Amount PC must be decremented by after a breakpoint.
  69    This is often the number of bytes in BREAKPOINT
  70    but not always.  */
  71
  72 #define DECR_PC_AFTER_BREAK 0
  73
  74 /* Return 1 if P points to an invalid floating point value.
  75    LEN is the length in bytes -- not relevant on the Tahoe. */
  76
  77 #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
  78
  79 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  80    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  81    real way to know how big a register is.  */
  82
  83 #define REGISTER_SIZE 4
  84
  85 /* Number of machine registers */
  86
  87 #define NUM_REGS 19
  88
  89 /* Initializer for an array of names of registers.
  90    There should be NUM_REGS strings in this initializer.  */
  91
  92 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
  93
  94 #define FP_REGNUM 13            /* Contains address of executing stack frame */
  95 #define SP_REGNUM 14            /* Contains address of top of stack */
  96 #define PC_REGNUM 15            /* Contains program counter */
  97 #define PS_REGNUM 16            /* Contains processor status */
  98
  99 #define AL_REGNUM 17            /* Contains accumulator */
 100 #define AH_REGNUM 18
 101
 102 /* Total amount of space needed to store our copies of the machine's
 103    register state, the array `registers'.  */
 104
 105 #define REGISTER_BYTES (19*4)
 106
 107 /* Index within `registers' of the first byte of the space for
 108    register N.  */
 109
 110 #define REGISTER_BYTE(N) ((N) * 4)
 111
 112 /* Number of bytes of storage in the actual machine representation
 113    for register N.  On the tahoe, all regs are 4 bytes.  */
 114
 115 #define REGISTER_RAW_SIZE(N) 4
 116
 117 /* Number of bytes of storage in the program's representation
 118    for register N.  On the tahoe, all regs are 4 bytes.  */
 119
 120 #define REGISTER_VIRTUAL_SIZE(N) 4
 121
 122 /* Largest value REGISTER_RAW_SIZE can have.  */
 123
 124 #define MAX_REGISTER_RAW_SIZE 4
 125
 126 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 127
 128 #define MAX_REGISTER_VIRTUAL_SIZE 4
 129
 130 /* Return the GDB type object for the "standard" data type
 131    of data in register N.  */
 132
 133 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
 134
 135 /* Store the address of the place in which to copy the structure the
 136    subroutine will return.  This is called from call_function. */
 137
 138 #define STORE_STRUCT_RETURN(ADDR, SP) \
 139   { write_register (1, (ADDR)); }
 140
 141 /* Extract from an array REGBUF containing the (raw) register state
 142    a function return value of type TYPE, and copy that, in virtual format,
 143    into VALBUF.  */
 144
 145 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 146   memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
 147
 148 /* Write into appropriate registers a function return value
 149    of type TYPE, given in virtual format.  */
 150
 151 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 152   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 153
 154 /* Extract from an array REGBUF containing the (raw) register state
 155    the address in which a function should return its structure value,
 156    as a CORE_ADDR (or an expression that can be used as one).  */
 157
 158 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 159
 160 /* Describe the pointer in each stack frame to the previous stack frame
 161    (its caller).
 162
 163    FRAME_CHAIN takes a frame's nominal address
 164    and produces the frame's chain-pointer. */
 165
 166 /* In the case of the Tahoe, the frame's nominal address is the FP value,
 167    and it points to the old FP */
 168
 169 #define FRAME_CHAIN(thisframe)  \
 170   (!inside_entry_file ((thisframe)->pc) ? \
 171    read_memory_integer ((thisframe)->frame, 4) :\
 172    0)
 173
 174 /* Define other aspects of the stack frame.  */
 175
 176 /* Saved PC */
 177
 178 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
 179
 180 /* In most of GDB, getting the args address is too important to
 181    just say "I don't know". */
 182
 183 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 184
 185 /* Address to use as an anchor for finding local variables */
 186
 187 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 188
 189 /* Return number of args passed to a frame.
 190    Can return -1, meaning no way to tell.  */
 191
 192 #define FRAME_NUM_ARGS(numargs, fi)  \
 193 { numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
 194
 195 /* Return number of bytes at start of arglist that are not really args.  */
 196
 197 #define FRAME_ARGS_SKIP 0
 198
 199 /* Put here the code to store, into a struct frame_saved_regs,
 200    the addresses of the saved registers of frame described by FRAME_INFO.
 201    This includes special registers such as pc and fp saved in special
 202    ways in the stack frame.  sp is even more special:
 203    the address we return for it IS the sp for the next frame.  */
 204
 205 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 206 { register int regnum;     \
 207   register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
 208   register CORE_ADDR next_addr;     \
 209   memset (&frame_saved_regs, '\0', sizeof frame_saved_regs);     \
 210   next_addr = (frame_info)->frame - 8;     \
 211   for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1)  \
 212     (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
 213   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;  \
 214   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8;  \
 215   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;      \
 216 }
 217
 218 /* Things needed for making the inferior call functions.  */
 219
 220 /* Push an empty stack frame, to record the current PC, etc.  */
 221
 222 #define PUSH_DUMMY_FRAME \
 223 { register CORE_ADDR sp = read_register (SP_REGNUM);    \
 224   register int regnum;                                  \
 225 printf("PUSH_DUMMY_FRAME\n");                           \
 226   sp = push_word (sp, read_register (FP_REGNUM));       \
 227   write_register (FP_REGNUM, sp);                       \
 228   sp = push_word (sp, 0x1fff0004);   /*SAVE MASK*/      \
 229   sp = push_word (sp, read_register (PC_REGNUM));       \
 230   for (regnum = 12; regnum >= 0; regnum--)              \
 231     sp = push_word (sp, read_register (regnum));        \
 232   write_register (SP_REGNUM, sp);                       \
 233 }
 234
 235 /* Discard from the stack the innermost frame, restoring all registers.  */
 236
 237 #define POP_FRAME  \
 238 { register CORE_ADDR fp = read_register (FP_REGNUM);                    \
 239   register int regnum;                                                  \
 240   register int regmask = read_memory_integer (fp-4, 4);                 \
 241 printf("POP_FRAME\n");                                                  \
 242   regmask >>= 16;                                                       \
 243   write_register (SP_REGNUM, fp+4);                                     \
 244   write_register (PC_REGNUM, read_memory_integer(fp-8, 4));             \
 245   write_register (FP_REGNUM, read_memory_integer(fp, 4));               \
 246   fp -= 8;                                                              \
 247   for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1)               \
 248     if (regmask & 0x1000)                                               \
 249       write_register (regnum, read_memory_integer (fp-=4, 4));          \
 250   flush_cached_frames ();                                               \
 251 }
 252
 253 /* This sequence of words is the instructions
 254      calls #69, @#32323232
 255      bpt
 256    Note this is 8 bytes.  */
 257
 258 #define CALL_DUMMY {0xbf699f32, 0x32323230}
 259
 260 /* Start execution at beginning of dummy */
 261
 262 #define CALL_DUMMY_START_OFFSET 0
 263
 264 /* Insert the specified number of args and function address
 265    into a call sequence of the above form stored at DUMMYNAME.  */
 266
 267 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, valtype, using_gcc) \
 268 { int temp = (int) fun;                         \
 269   *((char *) dummyname + 1) = nargs;            \
 270   memcpy((char *)dummyname+3,&temp,4); }
 271