gdb/tm-irix3.h

   1 /* Copyright (C) 1990 Free Software Foundation, Inc.
   2
   3 This file is part of GDB.
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  18
  19 #define TARGET_BYTE_ORDER BIG_ENDIAN
  20
  21 /* Floating point is IEEE compliant */
  22 #define IEEE_FLOAT
  23
  24 /* Define this if the C compiler puts an underscore at the front
  25    of external names before giving them to the linker.  */
  26
  27 /*#define NAMES_HAVE_UNDERSCORE*/
  28
  29 /* Debugger information will be in mips' format */
  30
  31 #define READ_MIPS_FORMAT
  32
  33 /* File format is coff, but with additions */
  34
  35 #define COFF_FORMAT
  36
  37 /* Offset from address of function to start of its code.
  38    Zero on most machines.  */
  39
  40 #define FUNCTION_START_OFFSET 0
  41
  42 /* Advance PC across any function entry prologue instructions
  43    to reach some "real" code.  */
  44
  45 #define SKIP_PROLOGUE(pc)       pc = mips_skip_prologue(pc)
  46
  47 /* Immediately after a function call, return the saved pc.
  48    Can't always go through the frames for this because on some machines
  49    the new frame is not set up until the new function executes
  50    some instructions.  */
  51
  52 #define SAVED_PC_AFTER_CALL(frame)      read_register(RA_REGNUM)
  53
  54 /* Are we currently handling a signal */
  55
  56 #define IN_SIGTRAMP(pc, name)   in_sigtramp(pc, name)
  57
  58 /* Address of end of stack space.  */
  59
  60 #define STACK_END_ADDR (0x7ffff000)
  61
  62 /* Stack grows downward.  */
  63
  64 #define INNER_THAN <
  65
  66 #define BREAKPOINT {0, 0x5, 0, 0xd}
  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 /* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */
  75
  76 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008)
  77
  78 /* Return 1 if P points to an invalid floating point value. */
  79
  80 #define INVALID_FLOAT(p,l)      isa_NAN(p,l)
  81
  82 /* Say how long (all) registers are.  */
  83
  84 #define REGISTER_TYPE long
  85
  86 /* Number of machine registers */
  87
  88 #define NUM_REGS 71
  89
  90 /* Initializer for an array of names of registers.
  91    There should be NUM_REGS strings in this initializer.  */
  92
  93 #define REGISTER_NAMES  \
  94     {   "zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3", \
  95         "t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7", \
  96         "s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7", \
  97         "t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "fp",   "ra", \
  98         "f0",   "f1",   "f2",   "f3",   "f4",   "f5",   "f6",   "f7", \
  99         "f8",   "f9",   "f10",  "f11",  "f12",  "f13",  "f14",  "f15", \
 100         "f16",  "f17",  "f18",  "f19",  "f20",  "f21",  "f22",  "f23",\
 101         "f24",  "f25",  "f26",  "f27",  "f28",  "f29",  "f30",  "f31",\
 102         "pc",   "cause", "bad", "hi",   "lo",   "fsr",  "fir" \
 103     }
 104
 105 /* Register numbers of various important registers.
 106    Note that some of these values are "real" register numbers,
 107    and correspond to the general registers of the machine,
 108    and some are "phony" register numbers which are too large
 109    to be actual register numbers as far as the user is concerned
 110    but do serve to get the desired values when passed to read_register.  */
 111
 112 #define SP_REGNUM 29            /* Contains address of top of stack */
 113 #define FP_REGNUM 30            /* Pseudo register that contains true address of executing stack frame */
 114 #define RA_REGNUM 31            /* Contains return address value */
 115 #define FP0_REGNUM 32           /* Floating point register 0 (single float) */
 116 #define PC_REGNUM 64            /* Contains program counter */
 117 #define PS_REGNUM 65            /* Contains processor status */
 118 #define HI_REGNUM 67            /* Multiple/divide temp */
 119 #define LO_REGNUM 68            /* ... */
 120 #define FCRCS_REGNUM 69         /* FP control/status */
 121 #define FCRIR_REGNUM 70         /* FP implementation/revision */
 122
 123 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
 124    of register dumps. */
 125
 126 #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
 127
 128 #define U_REGS_OFFSET 0
 129
 130 #define REGISTER_U_ADDR(addr, blockend, regno)          \
 131   if (regno < PC_REGNUM)                                \
 132       addr = regno;                                     \
 133   else                                                  \
 134       addr = regno + NSIG_HNDLRS; /* Skip over signal handlers */
 135
 136 /* Total amount of space needed to store our copies of the machine's
 137    register state, the array `registers'.  */
 138 #define REGISTER_BYTES (NUM_REGS*4)
 139
 140 /* Index within `registers' of the first byte of the space for
 141    register N.  */
 142
 143 #define REGISTER_BYTE(N) ((N) * 4)
 144
 145 /* Number of bytes of storage in the actual machine representation
 146    for register N.  On mips, all regs are 4 bytes.  */
 147
 148 #define REGISTER_RAW_SIZE(N) 4
 149
 150 /* Number of bytes of storage in the program's representation
 151    for register N.  On mips, all regs are 4 bytes.  */
 152
 153 #define REGISTER_VIRTUAL_SIZE(N) 4
 154
 155 /* Largest value REGISTER_RAW_SIZE can have.  */
 156
 157 #define MAX_REGISTER_RAW_SIZE 4
 158
 159 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 160
 161 #define MAX_REGISTER_VIRTUAL_SIZE 4
 162
 163 /* Nonzero if register N requires conversion
 164    from raw format to virtual format.  */
 165
 166 #define REGISTER_CONVERTIBLE(N) 0
 167
 168 /* Convert data from raw format for register REGNUM
 169    to virtual format for register REGNUM.  */
 170
 171 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 172   bcopy ((FROM), (TO), 4);
 173
 174 /* Convert data from virtual format for register REGNUM
 175    to raw format for register REGNUM.  */
 176
 177 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 178   bcopy ((FROM), (TO), 4);
 179
 180 /* Return the GDB type object for the "standard" data type
 181    of data in register N.  */
 182
 183 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
 184 /* Store the address of the place in which to copy the structure the
 185    subroutine will return.  This is called from call_function. */
 186
 187 #define STORE_STRUCT_RETURN(addr, sp) \
 188   { sp = push_word(sp, addr);}
 189
 190 /* Extract from an array REGBUF containing the (raw) register state
 191    a function return value of type TYPE, and copy that, in virtual format,
 192    into VALBUF.  XXX floats */
 193
 194 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 195   bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
 196
 197 /* Write into appropriate registers a function return value
 198    of type TYPE, given in virtual format.  */
 199
 200 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 201   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
 202
 203 /* Extract from an array REGBUF containing the (raw) register state
 204    the address in which a function should return its structure value,
 205    as a CORE_ADDR (or an expression that can be used as one).  */
 206
 207 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
 208
 209 /* Structures are returned by ref in extra arg0 */
 210 #define USE_STRUCT_CONVENTION(gcc_p, type)      1
 211
 212 \f
 213 /* Describe the pointer in each stack frame to the previous stack frame
 214    (its caller).  */
 215
 216 /* FRAME_CHAIN takes a frame's nominal address
 217    and produces the frame's chain-pointer.
 218
 219    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 220    and produces the nominal address of the caller frame.
 221
 222    However, if FRAME_CHAIN_VALID returns zero,
 223    it means the given frame is the outermost one and has no caller.
 224    In that case, FRAME_CHAIN_COMBINE is not used.  */
 225
 226 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
 227
 228 #define FRAME_CHAIN_VALID(chain, thisframe) \
 229   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 230
 231 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 232
 233 /* Define other aspects of the stack frame.  */
 234
 235
 236 /* A macro that tells us whether the function invocation represented
 237    by FI does not have a frame on the stack associated with it.  If it
 238    does not, FRAMELESS is set to 1, else 0.  */
 239 /* We handle this differently for mips, and maybe we should not */
 240
 241 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS)  {(FRAMELESS) = 0;}
 242
 243 /* Saved Pc.  */
 244
 245 #define FRAME_SAVED_PC(FRAME)   (mips_frame_saved_pc(FRAME))
 246
 247 #define FRAME_ARGS_ADDRESS(fi)  (fi)->frame
 248
 249 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
 250
 251 /* Return number of args passed to a frame.
 252    Can return -1, meaning no way to tell.  */
 253
 254 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
 255
 256 /* Return number of bytes at start of arglist that are not really args.  */
 257
 258 #define FRAME_ARGS_SKIP 0
 259
 260 /* Put here the code to store, into a struct frame_saved_regs,
 261    the addresses of the saved registers of frame described by FRAME_INFO.
 262    This includes special registers such as pc and fp saved in special
 263    ways in the stack frame.  sp is even more special:
 264    the address we return for it IS the sp for the next frame.  */
 265
 266 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
 267   (frame_saved_regs) = *(frame_info)->saved_regs, \
 268   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
 269
 270 \f
 271 /* Things needed for making the inferior call functions.  */
 272
 273 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
 274    to take care of it. */
 275 /*#define STACK_ALIGN(addr)     (((addr)+3)&~3)*/
 276
 277 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 278     sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
 279
 280 /* Push an empty stack frame, to record the current PC, etc.  */
 281
 282 #define PUSH_DUMMY_FRAME        mips_push_dummy_frame()
 283
 284 /* Discard from the stack the innermost frame, restoring all registers.  */
 285
 286 #define POP_FRAME               mips_pop_frame()
 287
 288 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
 289 #define CALL_DUMMY_SIZE (16*4)
 290 #define Dest_Reg 2
 291 #define CALL_DUMMY {\
 292  MK_OP(0,RA_REGNUM,0,8),        /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
 293  0,                             /* nop    #  ... to stop raw backtrace*/\
 294  0x27bd0000,                    /* addu sp,?0 # Pseudo prologue */\
 295 /* Start here: */\
 296  MK_OP(061,SP_REGNUM,12,0),     /* lwc1 $f12,0(sp) # Reload first 4 args*/\
 297  MK_OP(061,SP_REGNUM,13,4),     /* lwc1 $f13,4(sp) */\
 298  MK_OP(061,SP_REGNUM,14,8),     /* lwc1 $f14,8(sp) */\
 299  MK_OP(061,SP_REGNUM,15,12),    /* lwc1 $f15,12(sp) */\
 300  MK_OP(043,SP_REGNUM,4,0),      /* lw $r4,0(sp) # Re-load FP regs*/\
 301  MK_OP(043,SP_REGNUM,5,4),      /* lw $r5,4(sp) */\
 302  MK_OP(043,SP_REGNUM,6,8),      /* lw $r6,8(sp) */\
 303  MK_OP(043,SP_REGNUM,7,12),     /* lw $r7,12(sp) */\
 304  (017<<26)| (Dest_Reg << 16),   /* lui $r31,<target upper 16 bits>*/\
 305  MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
 306  (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
 307  MK_OP(043,SP_REGNUM,7,12),     /* lw $r7,12(sp) */\
 308  0x5000d,                       /* bpt */\
 309 }
 310
 311 #define CALL_DUMMY_START_OFFSET 12
 312
 313 /* Insert the specified number of args and function address
 314    into a call sequence of the above form stored at DUMMYNAME.  */
 315
 316 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
 317   (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
 318    ((int*)dummyname)[12] |= (unsigned short)(fun))
 319
 320 /* Specific information about a procedure.
 321    This overlays the MIPS's PDR records,
 322    mipsread.c (ab)uses this to save memory */
 323
 324 typedef struct mips_extra_func_info {
 325         unsigned long   adr;    /* memory address of start of procedure */
 326         long    isym;           /* pointer to procedure symbol */
 327         long    pad2;           /* iline: start of line number entries*/
 328         long    regmask;        /* save register mask */
 329         long    regoffset;      /* save register offset */
 330         long    numargs;        /* number of args to procedure (was iopt) */
 331         long    fregmask;       /* save floating point register mask */
 332         long    fregoffset;     /* save floating point register offset */
 333         long    framesize;      /* frameoffset: frame size */
 334         short   framereg;       /* frame pointer register */
 335         short   pcreg;          /* offset or reg of return pc */
 336         long    lnLow;          /* lowest line in the procedure */
 337         long    lnHigh;         /* highest line in the procedure */
 338         long    pad3;           /* cbLineOffset: byte offset for this procedure from the fd base */
 339 } *mips_extra_func_info_t;
 340
 341 #define EXTRA_FRAME_INFO \
 342   char *proc_desc; /* actually, a mips_extra_func_info_t */\
 343   int num_args;\
 344   struct frame_saved_regs *saved_regs;
 345
 346 #define INIT_EXTRA_FRAME_INFO(fci) init_extra_frame_info(fci)