gdb/tm-tahoe.h

   1 /* Definitions to make GDB target for a tahoe running 4.3-Reno.
   2    Copyright (C) 1986, 1987, 1989, 1991 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 /* This is the amount to subtract from u.u_ar0
  75    to get the offset in the core file of the register values.  */
  76
  77 #define KERNEL_U_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
  78
  79 /* Address of end of stack space.  */
  80
  81 #define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
  82
  83 /* On BSD, sigtramp is in the u area.  Can't check the exact
  84    addresses because for cross-debugging we don't have target include
  85    files around.  This should be close enough.  */
  86 #define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
  87
  88 /* Stack grows downward.  */
  89
  90 #define INNER_THAN <
  91
  92 /* Sequence of bytes for breakpoint instruction.  */
  93
  94 #define BREAKPOINT {0x30}
  95
  96 /* Amount PC must be decremented by after a breakpoint.
  97    This is often the number of bytes in BREAKPOINT
  98    but not always.  */
  99
 100 #define DECR_PC_AFTER_BREAK 0
 101
 102 /* Nonzero if instruction at PC is a return instruction.  */
 103
 104 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x40)
 105
 106 /* Return 1 if P points to an invalid floating point value.
 107    LEN is the length in bytes -- not relevant on the Tahoe. */
 108
 109 #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
 110
 111 /* Say how long (ordinary) registers are.  */
 112
 113 #define REGISTER_TYPE long
 114
 115 /* Number of machine registers */
 116
 117 #define NUM_REGS 19
 118
 119 /* Initializer for an array of names of registers.
 120    There should be NUM_REGS strings in this initializer.  */
 121
 122 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
 123
 124 #define FP_REGNUM 13            /* Contains address of executing stack frame */
 125 #define SP_REGNUM 14            /* Contains address of top of stack */
 126 #define PC_REGNUM 15            /* Contains program counter */
 127 #define PS_REGNUM 16            /* Contains processor status */
 128
 129 #define AL_REGNUM 17            /* Contains accumulator */
 130 #define AH_REGNUM 18
 131
 132 /* Total amount of space needed to store our copies of the machine's
 133    register state, the array `registers'.  */
 134
 135 #define REGISTER_BYTES (19*4)
 136
 137 /* Index within `registers' of the first byte of the space for
 138    register N.  */
 139
 140 #define REGISTER_BYTE(N) ((N) * 4)
 141
 142 /* Number of bytes of storage in the actual machine representation
 143    for register N.  On the tahoe, all regs are 4 bytes.  */
 144
 145 #define REGISTER_RAW_SIZE(N) 4
 146
 147 /* Number of bytes of storage in the program's representation
 148    for register N.  On the tahoe, all regs are 4 bytes.  */
 149
 150 #define REGISTER_VIRTUAL_SIZE(N) 4
 151
 152 /* Largest value REGISTER_RAW_SIZE can have.  */
 153
 154 #define MAX_REGISTER_RAW_SIZE 4
 155
 156 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 157
 158 #define MAX_REGISTER_VIRTUAL_SIZE 4
 159
 160 /* Nonzero if register N requires conversion
 161    from raw format to virtual format.  */
 162
 163 #define REGISTER_CONVERTIBLE(N) 0
 164
 165 /* Convert data from raw format for register REGNUM
 166    to virtual format for register REGNUM.  */
 167
 168 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 169   bcopy ((FROM), (TO), 4);
 170
 171 /* Convert data from virtual format for register REGNUM
 172    to raw format for register REGNUM.  */
 173
 174 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 175   bcopy ((FROM), (TO), 4);
 176
 177 /* Return the GDB type object for the "standard" data type
 178    of data in register N.  */
 179
 180 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
 181
 182 /* Store the address of the place in which to copy the structure the
 183    subroutine will return.  This is called from call_function. */
 184
 185 #define STORE_STRUCT_RETURN(ADDR, SP) \
 186   { write_register (1, (ADDR)); }
 187
 188 /* Extract from an array REGBUF containing the (raw) register state
 189    a function return value of type TYPE, and copy that, in virtual format,
 190    into VALBUF.  */
 191
 192 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 193   bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
 194
 195 /* Write into appropriate registers a function return value
 196    of type TYPE, given in virtual format.  */
 197
 198 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 199   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 200
 201 /* Extract from an array REGBUF containing the (raw) register state
 202    the address in which a function should return its structure value,
 203    as a CORE_ADDR (or an expression that can be used as one).  */
 204
 205 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 206
 207 /* Describe the pointer in each stack frame to the previous stack frame
 208    (its caller).
 209
 210    FRAME_CHAIN takes a frame's nominal address
 211    and produces the frame's chain-pointer. */
 212
 213 /* In the case of the Tahoe, the frame's nominal address is the FP value,
 214    and it points to the old FP */
 215
 216 #define FRAME_CHAIN(thisframe)  \
 217   (!inside_entry_file ((thisframe)->pc) ? \
 218    read_memory_integer ((thisframe)->frame, 4) :\
 219    0)
 220
 221 /* Define other aspects of the stack frame.  */
 222
 223 /* Saved PC */
 224
 225 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
 226
 227 /* In most of GDB, getting the args address is too important to
 228    just say "I don't know". */
 229
 230 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 231
 232 /* Address to use as an anchor for finding local variables */
 233
 234 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 235
 236 /* Return number of args passed to a frame.
 237    Can return -1, meaning no way to tell.  */
 238
 239 #define FRAME_NUM_ARGS(numargs, fi)  \
 240 { numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
 241
 242 /* Return number of bytes at start of arglist that are not really args.  */
 243
 244 #define FRAME_ARGS_SKIP 0
 245
 246 /* Put here the code to store, into a struct frame_saved_regs,
 247    the addresses of the saved registers of frame described by FRAME_INFO.
 248    This includes special registers such as pc and fp saved in special
 249    ways in the stack frame.  sp is even more special:
 250    the address we return for it IS the sp for the next frame.  */
 251
 252 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 253 { register int regnum;     \
 254   register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
 255   register CORE_ADDR next_addr;     \
 256   bzero (&frame_saved_regs, sizeof frame_saved_regs);     \
 257   next_addr = (frame_info)->frame - 8;     \
 258   for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1)  \
 259     (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
 260   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;  \
 261   (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8;  \
 262   (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;      \
 263 }
 264
 265 /* Things needed for making the inferior call functions.  */
 266
 267 /* Push an empty stack frame, to record the current PC, etc.  */
 268
 269 #define PUSH_DUMMY_FRAME \
 270 { register CORE_ADDR sp = read_register (SP_REGNUM);    \
 271   register int regnum;                                  \
 272 printf("PUSH_DUMMY_FRAME\n");                           \
 273   sp = push_word (sp, read_register (FP_REGNUM));       \
 274   write_register (FP_REGNUM, sp);                       \
 275   sp = push_word (sp, 0x1fff0004);   /*SAVE MASK*/      \
 276   sp = push_word (sp, read_register (PC_REGNUM));       \
 277   for (regnum = 12; regnum >= 0; regnum--)              \
 278     sp = push_word (sp, read_register (regnum));        \
 279   write_register (SP_REGNUM, sp);                       \
 280 }
 281
 282 /* Discard from the stack the innermost frame, restoring all registers.  */
 283
 284 #define POP_FRAME  \
 285 { register CORE_ADDR fp = read_register (FP_REGNUM);                    \
 286   register int regnum;                                                  \
 287   register int regmask = read_memory_integer (fp-4, 4);                 \
 288 printf("POP_FRAME\n");                                                  \
 289   regmask >>= 16;                                                       \
 290   write_register (SP_REGNUM, fp+4);                                     \
 291   write_register (PC_REGNUM, read_memory_integer(fp-8, 4));             \
 292   write_register (FP_REGNUM, read_memory_integer(fp, 4));               \
 293   fp -= 8;                                                              \
 294   for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1)               \
 295     if (regmask & 0x1000)                                               \
 296       write_register (regnum, read_memory_integer (fp-=4, 4));          \
 297   flush_cached_frames ();                                               \
 298   set_current_frame (create_new_frame (read_register (FP_REGNUM),       \
 299                                         read_pc ())); }
 300
 301 /* This sequence of words is the instructions
 302      calls #69, @#32323232
 303      bpt
 304    Note this is 8 bytes.  */
 305
 306 #define CALL_DUMMY {0xbf699f32, 0x32323230}
 307
 308 /* Start execution at beginning of dummy */
 309
 310 #define CALL_DUMMY_START_OFFSET 0
 311
 312 /* Insert the specified number of args and function address
 313    into a call sequence of the above form stored at DUMMYNAME.  */
 314
 315 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, valtype, using_gcc) \
 316 { int temp = (int) fun;                         \
 317   *((char *) dummyname + 1) = nargs;            \
 318   bcopy(&temp,(char *)dummyname+3,4); }
 319