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 #define SKIP_PROLOGUE(pc)       \
  37 { register int op = (unsigned char) read_memory_integer (pc, 1);  \
  38   if (op == 0x11) pc += 2;  /* skip brb */                        \
  39   if (op == 0x13) pc += 3;  /* skip brw */                        \
  40   if (op == 0x2c &&                                               \
  41       ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5e)    \
  42     pc += 3;  /* skip subl2 */                                    \
  43   if (op == 0xe9 &&                                               \
  44       ((unsigned char) read_memory_integer (pc+1, 1)) == 0xae &&  \
  45       ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5e)     \
  46      pc += 4;  /* skip movab */                                   \
  47   if (op == 0xe9 &&                                               \
  48       ((unsigned char) read_memory_integer (pc+1, 1)) == 0xce &&  \
  49       ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5e)     \
  50     pc += 5;  /* skip movab */                                    \
  51   if (op == 0xe9 &&                                               \
  52       ((unsigned char) read_memory_integer (pc+1, 1)) == 0xee &&  \
  53       ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5e)     \
  54     pc += 7;  /* skip movab */                                    \
  55 }
  56
  57 /* Immediately after a function call, return the saved pc.
  58    Can't always go through the frames for this because on some machines
  59    the new frame is not set up until the new function executes
  60    some instructions.  */
  61
  62 #define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
  63
  64 /* Wrong for cross-debugging.  I don't know the real values.  */
  65 #include <machine/param.h>
  66 #define TARGET_UPAGES UPAGES
  67 #define TARGET_NBPG NBPG
  68
  69 /* Address of end of stack space.  */
  70
  71 #define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
  72
  73 /* On BSD, sigtramp is in the u area.  Can't check the exact
  74    addresses because for cross-debugging we don't have target include
  75    files around.  This should be close enough.  */
  76 #define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
  77
  78 /* Stack grows downward.  */
  79
  80 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  81
  82 /* Sequence of bytes for breakpoint instruction.  */
  83
  84 #define BREAKPOINT {0x30}
  85
  86 /* Amount PC must be decremented by after a breakpoint.
  87    This is often the number of bytes in BREAKPOINT
  88    but not always.  */
  89
  90 #define DECR_PC_AFTER_BREAK 0
  91
  92 /* Return 1 if P points to an invalid floating point value.
  93    LEN is the length in bytes -- not relevant on the Tahoe. */
  94
  95 #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
  96
  97 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  98    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  99    real way to know how big a register is.  */
 100
 101 #define REGISTER_SIZE 4
 102
 103 /* Number of machine registers */
 104
 105 #define NUM_REGS 19
 106
 107 /* Initializer for an array of names of registers.
 108    There should be NUM_REGS strings in this initializer.  */
 109
 110 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
 111
 112 #define FP_REGNUM 13            /* Contains address of executing stack frame */
 113 #define SP_REGNUM 14            /* Contains address of top of stack */
 114 #define PC_REGNUM 15            /* Contains program counter */
 115 #define PS_REGNUM 16            /* Contains processor status */
 116
 117 #define AL_REGNUM 17            /* Contains accumulator */
 118 #define AH_REGNUM 18
 119
 120 /* Total amount of space needed to store our copies of the machine's
 121    register state, the array `registers'.  */
 122
 123 #define REGISTER_BYTES (19*4)
 124
 125 /* Index within `registers' of the first byte of the space for
 126    register N.  */
 127
 128 #define REGISTER_BYTE(N) ((N) * 4)
 129
 130 /* Number of bytes of storage in the actual machine representation
 131    for register N.  On the tahoe, all regs are 4 bytes.  */
 132
 133 #define REGISTER_RAW_SIZE(N) 4
 134
 135 /* Number of bytes of storage in the program's representation
 136    for register N.  On the tahoe, all regs are 4 bytes.  */
 137
 138 #define REGISTER_VIRTUAL_SIZE(N) 4
 139
 140 /* Largest value REGISTER_RAW_SIZE can have.  */
 141
 142 #define MAX_REGISTER_RAW_SIZE 4
 143
 144 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 145
 146 #define MAX_REGISTER_VIRTUAL_SIZE 4
 147
 148 /* Return the GDB type object for the "standard" data type
 149    of data in register N.  */
 150
 151 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
 152
 153 /* Store the address of the place in which to copy the structure the
 154    subroutine will return.  This is called from call_function. */
 155
 156 #define STORE_STRUCT_RETURN(ADDR, SP) \
 157   { write_register (1, (ADDR)); }
 158
 159 /* Extract from an array REGBUF containing the (raw) register state
 160    a function return value of type TYPE, and copy that, in virtual format,
 161    into VALBUF.  */
 162
 163 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 164   memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
 165
 166 /* Write into appropriate registers a function return value
 167    of type TYPE, given in virtual format.  */
 168
 169 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 170   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 171
 172 /* Extract from an array REGBUF containing the (raw) register state
 173    the address in which a function should return its structure value,
 174    as a CORE_ADDR (or an expression that can be used as one).  */
 175
 176 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 177
 178 /* Describe the pointer in each stack frame to the previous stack frame
 179    (its caller).
 180
 181    FRAME_CHAIN takes a frame's nominal address
 182    and produces the frame's chain-pointer. */
 183
 184 /* In the case of the Tahoe, the frame's nominal address is the FP value,
 185    and it points to the old FP */
 186
 187 #define FRAME_CHAIN(thisframe)  \
 188   (!inside_entry_file ((thisframe)->pc) ? \
 189    read_memory_integer ((thisframe)->frame, 4) :\
 190    0)
 191
 192 /* Define other aspects of the stack frame.  */
 193
 194 /* Saved PC */
 195
 196 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
 197
 198 /* In most of GDB, getting the args address is too important to
 199    just say "I don't know". */
 200
 201 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 202
 203 /* Address to use as an anchor for finding local variables */
 204
 205 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 206
 207 /* Return number of args passed to a frame.
 208    Can return -1, meaning no way to tell.  */
 209
 210 #define FRAME_NUM_ARGS(numargs, fi)  \
 211 { numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
 212
 213 /* Return number of bytes at start of arglist that are not really args.  */
 214
 215 #define FRAME_ARGS_SKIP 0
 216
 217 /* Put here the code to store, into a struct frame_saved_regs,
 218    the addresses of the saved registers of frame described by FRAME_INFO.
 219    This includes special registers such as pc and fp saved in special
 220    ways in the stack frame.  sp is even more special:
 221    the address we return for it IS the sp for the next frame.  */
 222
 223 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 224 { register int regnum;     \
 225   register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
 226   register CORE_ADDR next_addr;     \
 227   memset (&frame_saved_regs, '\0', sizeof frame_saved_regs);     \
 228   next_addr = (frame_info)->frame - 8;     \
 229   for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1)  \
 230     (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
 231   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;  \
 232   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8;  \
 233   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;      \
 234 }
 235
 236 /* Things needed for making the inferior call functions.  */
 237
 238 /* Push an empty stack frame, to record the current PC, etc.  */
 239
 240 #define PUSH_DUMMY_FRAME \
 241 { register CORE_ADDR sp = read_register (SP_REGNUM);    \
 242   register int regnum;                                  \
 243 printf("PUSH_DUMMY_FRAME\n");                           \
 244   sp = push_word (sp, read_register (FP_REGNUM));       \
 245   write_register (FP_REGNUM, sp);                       \
 246   sp = push_word (sp, 0x1fff0004);   /*SAVE MASK*/      \
 247   sp = push_word (sp, read_register (PC_REGNUM));       \
 248   for (regnum = 12; regnum >= 0; regnum--)              \
 249     sp = push_word (sp, read_register (regnum));        \
 250   write_register (SP_REGNUM, sp);                       \
 251 }
 252
 253 /* Discard from the stack the innermost frame, restoring all registers.  */
 254
 255 #define POP_FRAME  \
 256 { register CORE_ADDR fp = read_register (FP_REGNUM);                    \
 257   register int regnum;                                                  \
 258   register int regmask = read_memory_integer (fp-4, 4);                 \
 259 printf("POP_FRAME\n");                                                  \
 260   regmask >>= 16;                                                       \
 261   write_register (SP_REGNUM, fp+4);                                     \
 262   write_register (PC_REGNUM, read_memory_integer(fp-8, 4));             \
 263   write_register (FP_REGNUM, read_memory_integer(fp, 4));               \
 264   fp -= 8;                                                              \
 265   for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1)               \
 266     if (regmask & 0x1000)                                               \
 267       write_register (regnum, read_memory_integer (fp-=4, 4));          \
 268   flush_cached_frames ();                                               \
 269 }
 270
 271 /* This sequence of words is the instructions
 272      calls #69, @#32323232
 273      bpt
 274    Note this is 8 bytes.  */
 275
 276 #define CALL_DUMMY {0xbf699f32, 0x32323230}
 277
 278 /* Start execution at beginning of dummy */
 279
 280 #define CALL_DUMMY_START_OFFSET 0
 281
 282 /* Insert the specified number of args and function address
 283    into a call sequence of the above form stored at DUMMYNAME.  */
 284
 285 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, valtype, using_gcc) \
 286 { int temp = (int) fun;                         \
 287   *((char *) dummyname + 1) = nargs;            \
 288   memcpy((char *)dummyname+3,&temp,4); }
 289