gdb/tm-tahoe.h

   1 /* Definitions to make GDB target for a tahoe running 4.3-Reno.
   2    Copyright 1986, 1987, 1989, 1991, 1992 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 /*
  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 /* Define this if the C compiler puts an underscore at the front
  29    of external names before giving them to the linker.  */
  30
  31 #define NAMES_HAVE_UNDERSCORE
  32
  33 /* Offset from address of function to start of its code.
  34    Zero on most machines.  */
  35
  36 #define FUNCTION_START_OFFSET 2
  37
  38 /* Advance PC across any function entry prologue instructions
  39    to reach some "real" code.  */
  40
  41 #define SKIP_PROLOGUE(pc)       \
  42 { register int op = (unsigned char) read_memory_integer (pc, 1);  \
  43   if (op == 0x11) pc += 2;  /* skip brb */                        \
  44   if (op == 0x13) pc += 3;  /* skip brw */                        \
  45   if (op == 0x2c &&                                               \
  46       ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5e)    \
  47     pc += 3;  /* skip subl2 */                                    \
  48   if (op == 0xe9 &&                                               \
  49       ((unsigned char) read_memory_integer (pc+1, 1)) == 0xae &&  \
  50       ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5e)     \
  51      pc += 4;  /* skip movab */                                   \
  52   if (op == 0xe9 &&                                               \
  53       ((unsigned char) read_memory_integer (pc+1, 1)) == 0xce &&  \
  54       ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5e)     \
  55     pc += 5;  /* skip movab */                                    \
  56   if (op == 0xe9 &&                                               \
  57       ((unsigned char) read_memory_integer (pc+1, 1)) == 0xee &&  \
  58       ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5e)     \
  59     pc += 7;  /* skip movab */                                    \
  60 }
  61
  62 /* Immediately after a function call, return the saved pc.
  63    Can't always go through the frames for this because on some machines
  64    the new frame is not set up until the new function executes
  65    some instructions.  */
  66
  67 #define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
  68
  69 /* Wrong for cross-debugging.  I don't know the real values.  */
  70 #include <machine/param.h>
  71 #define TARGET_UPAGES UPAGES
  72 #define TARGET_NBPG NBPG
  73
  74 /* Address of end of stack space.  */
  75
  76 #define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
  77
  78 /* On BSD, sigtramp is in the u area.  Can't check the exact
  79    addresses because for cross-debugging we don't have target include
  80    files around.  This should be close enough.  */
  81 #define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
  82
  83 /* Stack grows downward.  */
  84
  85 #define INNER_THAN <
  86
  87 /* Sequence of bytes for breakpoint instruction.  */
  88
  89 #define BREAKPOINT {0x30}
  90
  91 /* Amount PC must be decremented by after a breakpoint.
  92    This is often the number of bytes in BREAKPOINT
  93    but not always.  */
  94
  95 #define DECR_PC_AFTER_BREAK 0
  96
  97 /* Nonzero if instruction at PC is a return instruction.  */
  98
  99 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x40)
 100
 101 /* Return 1 if P points to an invalid floating point value.
 102    LEN is the length in bytes -- not relevant on the Tahoe. */
 103
 104 #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
 105
 106 /* Say how long (ordinary) registers are.  */
 107
 108 #define REGISTER_TYPE long
 109
 110 /* Number of machine registers */
 111
 112 #define NUM_REGS 19
 113
 114 /* Initializer for an array of names of registers.
 115    There should be NUM_REGS strings in this initializer.  */
 116
 117 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
 118
 119 #define FP_REGNUM 13            /* Contains address of executing stack frame */
 120 #define SP_REGNUM 14            /* Contains address of top of stack */
 121 #define PC_REGNUM 15            /* Contains program counter */
 122 #define PS_REGNUM 16            /* Contains processor status */
 123
 124 #define AL_REGNUM 17            /* Contains accumulator */
 125 #define AH_REGNUM 18
 126
 127 /* Total amount of space needed to store our copies of the machine's
 128    register state, the array `registers'.  */
 129
 130 #define REGISTER_BYTES (19*4)
 131
 132 /* Index within `registers' of the first byte of the space for
 133    register N.  */
 134
 135 #define REGISTER_BYTE(N) ((N) * 4)
 136
 137 /* Number of bytes of storage in the actual machine representation
 138    for register N.  On the tahoe, all regs are 4 bytes.  */
 139
 140 #define REGISTER_RAW_SIZE(N) 4
 141
 142 /* Number of bytes of storage in the program's representation
 143    for register N.  On the tahoe, all regs are 4 bytes.  */
 144
 145 #define REGISTER_VIRTUAL_SIZE(N) 4
 146
 147 /* Largest value REGISTER_RAW_SIZE can have.  */
 148
 149 #define MAX_REGISTER_RAW_SIZE 4
 150
 151 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 152
 153 #define MAX_REGISTER_VIRTUAL_SIZE 4
 154
 155 /* Nonzero if register N requires conversion
 156    from raw format to virtual format.  */
 157
 158 #define REGISTER_CONVERTIBLE(N) 0
 159
 160 /* Convert data from raw format for register REGNUM
 161    to virtual format for register REGNUM.  */
 162
 163 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 164   bcopy ((FROM), (TO), 4);
 165
 166 /* Convert data from virtual format for register REGNUM
 167    to raw format for register REGNUM.  */
 168
 169 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 170   bcopy ((FROM), (TO), 4);
 171
 172 /* Return the GDB type object for the "standard" data type
 173    of data in register N.  */
 174
 175 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
 176
 177 /* Store the address of the place in which to copy the structure the
 178    subroutine will return.  This is called from call_function. */
 179
 180 #define STORE_STRUCT_RETURN(ADDR, SP) \
 181   { write_register (1, (ADDR)); }
 182
 183 /* Extract from an array REGBUF containing the (raw) register state
 184    a function return value of type TYPE, and copy that, in virtual format,
 185    into VALBUF.  */
 186
 187 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 188   bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
 189
 190 /* Write into appropriate registers a function return value
 191    of type TYPE, given in virtual format.  */
 192
 193 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 194   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 195
 196 /* Extract from an array REGBUF containing the (raw) register state
 197    the address in which a function should return its structure value,
 198    as a CORE_ADDR (or an expression that can be used as one).  */
 199
 200 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 201
 202 /* Describe the pointer in each stack frame to the previous stack frame
 203    (its caller).
 204
 205    FRAME_CHAIN takes a frame's nominal address
 206    and produces the frame's chain-pointer. */
 207
 208 /* In the case of the Tahoe, the frame's nominal address is the FP value,
 209    and it points to the old FP */
 210
 211 #define FRAME_CHAIN(thisframe)  \
 212   (!inside_entry_file ((thisframe)->pc) ? \
 213    read_memory_integer ((thisframe)->frame, 4) :\
 214    0)
 215
 216 /* Define other aspects of the stack frame.  */
 217
 218 /* Saved PC */
 219
 220 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
 221
 222 /* In most of GDB, getting the args address is too important to
 223    just say "I don't know". */
 224
 225 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 226
 227 /* Address to use as an anchor for finding local variables */
 228
 229 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 230
 231 /* Return number of args passed to a frame.
 232    Can return -1, meaning no way to tell.  */
 233
 234 #define FRAME_NUM_ARGS(numargs, fi)  \
 235 { numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
 236
 237 /* Return number of bytes at start of arglist that are not really args.  */
 238
 239 #define FRAME_ARGS_SKIP 0
 240
 241 /* Put here the code to store, into a struct frame_saved_regs,
 242    the addresses of the saved registers of frame described by FRAME_INFO.
 243    This includes special registers such as pc and fp saved in special
 244    ways in the stack frame.  sp is even more special:
 245    the address we return for it IS the sp for the next frame.  */
 246
 247 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 248 { register int regnum;     \
 249   register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
 250   register CORE_ADDR next_addr;     \
 251   bzero (&frame_saved_regs, sizeof frame_saved_regs);     \
 252   next_addr = (frame_info)->frame - 8;     \
 253   for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1)  \
 254     (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
 255   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;  \
 256   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8;  \
 257   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;      \
 258 }
 259
 260 /* Things needed for making the inferior call functions.  */
 261
 262 /* Push an empty stack frame, to record the current PC, etc.  */
 263
 264 #define PUSH_DUMMY_FRAME \
 265 { register CORE_ADDR sp = read_register (SP_REGNUM);    \
 266   register int regnum;                                  \
 267 printf("PUSH_DUMMY_FRAME\n");                           \
 268   sp = push_word (sp, read_register (FP_REGNUM));       \
 269   write_register (FP_REGNUM, sp);                       \
 270   sp = push_word (sp, 0x1fff0004);   /*SAVE MASK*/      \
 271   sp = push_word (sp, read_register (PC_REGNUM));       \
 272   for (regnum = 12; regnum >= 0; regnum--)              \
 273     sp = push_word (sp, read_register (regnum));        \
 274   write_register (SP_REGNUM, sp);                       \
 275 }
 276
 277 /* Discard from the stack the innermost frame, restoring all registers.  */
 278
 279 #define POP_FRAME  \
 280 { register CORE_ADDR fp = read_register (FP_REGNUM);                    \
 281   register int regnum;                                                  \
 282   register int regmask = read_memory_integer (fp-4, 4);                 \
 283 printf("POP_FRAME\n");                                                  \
 284   regmask >>= 16;                                                       \
 285   write_register (SP_REGNUM, fp+4);                                     \
 286   write_register (PC_REGNUM, read_memory_integer(fp-8, 4));             \
 287   write_register (FP_REGNUM, read_memory_integer(fp, 4));               \
 288   fp -= 8;                                                              \
 289   for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1)               \
 290     if (regmask & 0x1000)                                               \
 291       write_register (regnum, read_memory_integer (fp-=4, 4));          \
 292   flush_cached_frames ();                                               \
 293   set_current_frame (create_new_frame (read_register (FP_REGNUM),       \
 294                                         read_pc ())); }
 295
 296 /* This sequence of words is the instructions
 297      calls #69, @#32323232
 298      bpt
 299    Note this is 8 bytes.  */
 300
 301 #define CALL_DUMMY {0xbf699f32, 0x32323230}
 302
 303 /* Start execution at beginning of dummy */
 304
 305 #define CALL_DUMMY_START_OFFSET 0
 306
 307 /* Insert the specified number of args and function address
 308    into a call sequence of the above form stored at DUMMYNAME.  */
 309
 310 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, valtype, using_gcc) \
 311 { int temp = (int) fun;                         \
 312   *((char *) dummyname + 1) = nargs;            \
 313   bcopy(&temp,(char *)dummyname+3,4); }
 314