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 /* Total amount of space needed to store our copies of the machine's
 129    register state, the array `registers'.  */
 130 #define REGISTER_BYTES (NUM_REGS*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 mips, 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 mips, 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 /* Store the address of the place in which to copy the structure the
 177    subroutine will return.  This is called from call_function. */
 178
 179 #define STORE_STRUCT_RETURN(addr, sp) \
 180   { sp = push_word(sp, addr);}
 181
 182 /* Extract from an array REGBUF containing the (raw) register state
 183    a function return value of type TYPE, and copy that, in virtual format,
 184    into VALBUF.  XXX floats */
 185
 186 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 187   bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
 188
 189 /* Write into appropriate registers a function return value
 190    of type TYPE, given in virtual format.  */
 191
 192 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 193   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
 194
 195 /* Extract from an array REGBUF containing the (raw) register state
 196    the address in which a function should return its structure value,
 197    as a CORE_ADDR (or an expression that can be used as one).  */
 198
 199 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
 200
 201 /* Structures are returned by ref in extra arg0 */
 202 #define USE_STRUCT_CONVENTION(gcc_p, type)      1
 203
 204 \f
 205 /* Describe the pointer in each stack frame to the previous stack frame
 206    (its caller).  */
 207
 208 /* FRAME_CHAIN takes a frame's nominal address
 209    and produces the frame's chain-pointer.
 210
 211    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 212    and produces the nominal address of the caller frame.
 213
 214    However, if FRAME_CHAIN_VALID returns zero,
 215    it means the given frame is the outermost one and has no caller.
 216    In that case, FRAME_CHAIN_COMBINE is not used.  */
 217
 218 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
 219
 220 #define FRAME_CHAIN_VALID(chain, thisframe) \
 221   (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
 222
 223 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 224
 225 /* Define other aspects of the stack frame.  */
 226
 227
 228 /* A macro that tells us whether the function invocation represented
 229    by FI does not have a frame on the stack associated with it.  If it
 230    does not, FRAMELESS is set to 1, else 0.  */
 231 /* We handle this differently for mips, and maybe we should not */
 232
 233 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS)  {(FRAMELESS) = 0;}
 234
 235 /* Saved Pc.  */
 236
 237 #define FRAME_SAVED_PC(FRAME)   (mips_frame_saved_pc(FRAME))
 238
 239 #define FRAME_ARGS_ADDRESS(fi)  (fi)->frame
 240
 241 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
 242
 243 /* Return number of args passed to a frame.
 244    Can return -1, meaning no way to tell.  */
 245
 246 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
 247
 248 /* Return number of bytes at start of arglist that are not really args.  */
 249
 250 #define FRAME_ARGS_SKIP 0
 251
 252 /* Put here the code to store, into a struct frame_saved_regs,
 253    the addresses of the saved registers of frame described by FRAME_INFO.
 254    This includes special registers such as pc and fp saved in special
 255    ways in the stack frame.  sp is even more special:
 256    the address we return for it IS the sp for the next frame.  */
 257
 258 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
 259   (frame_saved_regs) = *(frame_info)->saved_regs, \
 260   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
 261
 262 \f
 263 /* Things needed for making the inferior call functions.  */
 264
 265 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
 266    to take care of it. */
 267 /*#define STACK_ALIGN(addr)     (((addr)+3)&~3)*/
 268
 269 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 270     sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
 271
 272 /* Push an empty stack frame, to record the current PC, etc.  */
 273
 274 #define PUSH_DUMMY_FRAME        mips_push_dummy_frame()
 275
 276 /* Discard from the stack the innermost frame, restoring all registers.  */
 277
 278 #define POP_FRAME               mips_pop_frame()
 279
 280 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
 281 #define CALL_DUMMY_SIZE (16*4)
 282 #define Dest_Reg 2
 283 #define CALL_DUMMY {\
 284  MK_OP(0,RA_REGNUM,0,8),        /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
 285  0,                             /* nop    #  ... to stop raw backtrace*/\
 286  0x27bd0000,                    /* addu sp,?0 # Pseudo prologue */\
 287 /* Start here: */\
 288  MK_OP(061,SP_REGNUM,12,0),     /* lwc1 $f12,0(sp) # Reload first 4 args*/\
 289  MK_OP(061,SP_REGNUM,13,4),     /* lwc1 $f13,4(sp) */\
 290  MK_OP(061,SP_REGNUM,14,8),     /* lwc1 $f14,8(sp) */\
 291  MK_OP(061,SP_REGNUM,15,12),    /* lwc1 $f15,12(sp) */\
 292  MK_OP(043,SP_REGNUM,4,0),      /* lw $r4,0(sp) # Re-load FP regs*/\
 293  MK_OP(043,SP_REGNUM,5,4),      /* lw $r5,4(sp) */\
 294  MK_OP(043,SP_REGNUM,6,8),      /* lw $r6,8(sp) */\
 295  MK_OP(043,SP_REGNUM,7,12),     /* lw $r7,12(sp) */\
 296  (017<<26)| (Dest_Reg << 16),   /* lui $r31,<target upper 16 bits>*/\
 297  MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
 298  (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
 299  MK_OP(043,SP_REGNUM,7,12),     /* lw $r7,12(sp) */\
 300  0x5000d,                       /* bpt */\
 301 }
 302
 303 #define CALL_DUMMY_START_OFFSET 12
 304
 305 /* Insert the specified number of args and function address
 306    into a call sequence of the above form stored at DUMMYNAME.  */
 307
 308 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
 309   (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
 310    ((int*)dummyname)[12] |= (unsigned short)(fun))
 311
 312 /* Specific information about a procedure.
 313    This overlays the MIPS's PDR records,
 314    mipsread.c (ab)uses this to save memory */
 315
 316 typedef struct mips_extra_func_info {
 317         unsigned long   adr;    /* memory address of start of procedure */
 318         long    isym;           /* pointer to procedure symbol */
 319         long    pad2;           /* iline: start of line number entries*/
 320         long    regmask;        /* save register mask */
 321         long    regoffset;      /* save register offset */
 322         long    numargs;        /* number of args to procedure (was iopt) */
 323         long    fregmask;       /* save floating point register mask */
 324         long    fregoffset;     /* save floating point register offset */
 325         long    framesize;      /* frameoffset: frame size */
 326         short   framereg;       /* frame pointer register */
 327         short   pcreg;          /* offset or reg of return pc */
 328         long    lnLow;          /* lowest line in the procedure */
 329         long    lnHigh;         /* highest line in the procedure */
 330         long    pad3;           /* cbLineOffset: byte offset for this procedure from the fd base */
 331 } *mips_extra_func_info_t;
 332
 333 #define EXTRA_FRAME_INFO \
 334   char *proc_desc; /* actually, a mips_extra_func_info_t */\
 335   int num_args;\
 336   struct frame_saved_regs *saved_regs;
 337
 338 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)