gdb/tm-irix3.h

   1 /* Target machine description for SGI Iris under Irix, for GDB.
   2    Copyright 1990, 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 #include "coff/sym.h"                   /* Needed for PDR below. */
  21 #include "coff/symconst.h"
  22
  23 #define TARGET_BYTE_ORDER BIG_ENDIAN
  24
  25 /* Floating point is IEEE compliant */
  26 #define IEEE_FLOAT
  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 0
  37
  38 /* Advance PC across any function entry prologue instructions
  39    to reach some "real" code.  */
  40
  41 #define SKIP_PROLOGUE(pc)       pc = mips_skip_prologue(pc)
  42
  43 /* Immediately after a function call, return the saved pc.
  44    Can't always go through the frames for this because on some machines
  45    the new frame is not set up until the new function executes
  46    some instructions.  */
  47
  48 #define SAVED_PC_AFTER_CALL(frame)      read_register(RA_REGNUM)
  49
  50 /* Are we currently handling a signal */
  51
  52 #define IN_SIGTRAMP(pc, name)   in_sigtramp(pc, name)
  53
  54 /* Address of end of stack space.  */
  55
  56 #define STACK_END_ADDR (0x7ffff000)
  57
  58 /* Stack grows downward.  */
  59
  60 #define INNER_THAN <
  61
  62 #define BREAKPOINT {0, 0x5, 0, 0xd}
  63
  64 /* Amount PC must be decremented by after a breakpoint.
  65    This is often the number of bytes in BREAKPOINT
  66    but not always.  */
  67
  68 #define DECR_PC_AFTER_BREAK 0
  69
  70 /* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */
  71
  72 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008)
  73
  74 /* Return 1 if P points to an invalid floating point value. */
  75
  76 #define INVALID_FLOAT(p,l)      isa_NAN(p,l)
  77
  78 /* Say how long (all) registers are.  */
  79
  80 #define REGISTER_TYPE long
  81
  82 /* Number of machine registers */
  83
  84 #define NUM_REGS 71
  85
  86 /* Initializer for an array of names of registers.
  87    There should be NUM_REGS strings in this initializer.  */
  88
  89 #define REGISTER_NAMES  \
  90     {   "zero", "at",   "v0",   "v1",   "a0",   "a1",   "a2",   "a3", \
  91         "t0",   "t1",   "t2",   "t3",   "t4",   "t5",   "t6",   "t7", \
  92         "s0",   "s1",   "s2",   "s3",   "s4",   "s5",   "s6",   "s7", \
  93         "t8",   "t9",   "k0",   "k1",   "gp",   "sp",   "fp",   "ra", \
  94         "f0",   "f1",   "f2",   "f3",   "f4",   "f5",   "f6",   "f7", \
  95         "f8",   "f9",   "f10",  "f11",  "f12",  "f13",  "f14",  "f15", \
  96         "f16",  "f17",  "f18",  "f19",  "f20",  "f21",  "f22",  "f23",\
  97         "f24",  "f25",  "f26",  "f27",  "f28",  "f29",  "f30",  "f31",\
  98         "pc",   "cause", "bad", "hi",   "lo",   "fsr",  "fir" \
  99     }
 100
 101 /* Register numbers of various important registers.
 102    Note that some of these values are "real" register numbers,
 103    and correspond to the general registers of the machine,
 104    and some are "phony" register numbers which are too large
 105    to be actual register numbers as far as the user is concerned
 106    but do serve to get the desired values when passed to read_register.  */
 107
 108 #define A0_REGNUM 4             /* Loc of first arg during a subr call */
 109 #define SP_REGNUM 29            /* Contains address of top of stack */
 110 #define FP_REGNUM 30            /* Pseudo register that contains true address of executing stack frame */
 111 #define RA_REGNUM 31            /* Contains return address value */
 112 #define FP0_REGNUM 32           /* Floating point register 0 (single float) */
 113 #define PC_REGNUM 64            /* Contains program counter */
 114 #define PS_REGNUM 65            /* Contains processor status */
 115 #define HI_REGNUM 67            /* Multiple/divide temp */
 116 #define LO_REGNUM 68            /* ... */
 117 #define FCRCS_REGNUM 69         /* FP control/status */
 118 #define FCRIR_REGNUM 70         /* FP implementation/revision */
 119
 120 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
 121    of register dumps. */
 122
 123 #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
 124
 125 /* Total amount of space needed to store our copies of the machine's
 126    register state, the array `registers'.  */
 127 #define REGISTER_BYTES (NUM_REGS*4)
 128
 129 /* Index within `registers' of the first byte of the space for
 130    register N.  */
 131
 132 #define REGISTER_BYTE(N) ((N) * 4)
 133
 134 /* Number of bytes of storage in the actual machine representation
 135    for register N.  On mips, all regs are 4 bytes.  */
 136
 137 #define REGISTER_RAW_SIZE(N) 4
 138
 139 /* Number of bytes of storage in the program's representation
 140    for register N.  On mips, all regs are 4 bytes.  */
 141
 142 #define REGISTER_VIRTUAL_SIZE(N) 4
 143
 144 /* Largest value REGISTER_RAW_SIZE can have.  */
 145
 146 #define MAX_REGISTER_RAW_SIZE 4
 147
 148 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 149
 150 #define MAX_REGISTER_VIRTUAL_SIZE 4
 151
 152 /* Nonzero if register N requires conversion
 153    from raw format to virtual format.  */
 154
 155 #define REGISTER_CONVERTIBLE(N) 0
 156
 157 /* Convert data from raw format for register REGNUM
 158    to virtual format for register REGNUM.  */
 159
 160 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 161   bcopy ((FROM), (TO), 4);
 162
 163 /* Convert data from virtual format for register REGNUM
 164    to raw format for register REGNUM.  */
 165
 166 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 167   bcopy ((FROM), (TO), 4);
 168
 169 /* Return the GDB type object for the "standard" data type
 170    of data in register N.  */
 171
 172 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
 173 /* Store the address of the place in which to copy the structure the
 174    subroutine will return.  This is called from call_function. */
 175
 176 #define STORE_STRUCT_RETURN(addr, sp) \
 177   { sp = push_word(sp, addr);}
 178
 179 /* Extract from an array REGBUF containing the (raw) register state
 180    a function return value of type TYPE, and copy that, in virtual format,
 181    into VALBUF.  XXX floats */
 182
 183 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 184   bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
 185
 186 /* Write into appropriate registers a function return value
 187    of type TYPE, given in virtual format.  */
 188
 189 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 190   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
 191
 192 /* Extract from an array REGBUF containing the (raw) register state
 193    the address in which a function should return its structure value,
 194    as a CORE_ADDR (or an expression that can be used as one).  */
 195
 196 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
 197
 198 /* Structures are returned by ref in extra arg0 */
 199 #define USE_STRUCT_CONVENTION(gcc_p, type)      1
 200
 201 \f
 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 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
 209
 210 /* Define other aspects of the stack frame.  */
 211
 212
 213 /* A macro that tells us whether the function invocation represented
 214    by FI does not have a frame on the stack associated with it.  If it
 215    does not, FRAMELESS is set to 1, else 0.  */
 216 /* We handle this differently for mips, and maybe we should not */
 217
 218 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS)  {(FRAMELESS) = 0;}
 219
 220 /* Saved Pc.  */
 221
 222 #define FRAME_SAVED_PC(FRAME)   (mips_frame_saved_pc(FRAME))
 223
 224 #define FRAME_ARGS_ADDRESS(fi)  (fi)->frame
 225
 226 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
 227
 228 /* Return number of args passed to a frame.
 229    Can return -1, meaning no way to tell.  */
 230
 231 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
 232
 233 /* Return number of bytes at start of arglist that are not really args.  */
 234
 235 #define FRAME_ARGS_SKIP 0
 236
 237 /* Put here the code to store, into a struct frame_saved_regs,
 238    the addresses of the saved registers of frame described by FRAME_INFO.
 239    This includes special registers such as pc and fp saved in special
 240    ways in the stack frame.  sp is even more special:
 241    the address we return for it IS the sp for the next frame.  */
 242
 243 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
 244   (frame_saved_regs) = *(frame_info)->saved_regs, \
 245   (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
 246
 247 \f
 248 /* Things needed for making the inferior call functions.  */
 249
 250 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
 251    to take care of it. */
 252 /*#define STACK_ALIGN(addr)     (((addr)+3)&~3)*/
 253
 254 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 255     sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
 256
 257 /* Push an empty stack frame, to record the current PC, etc.  */
 258
 259 #define PUSH_DUMMY_FRAME        mips_push_dummy_frame()
 260
 261 /* Discard from the stack the innermost frame, restoring all registers.  */
 262
 263 #define POP_FRAME               mips_pop_frame()
 264
 265 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
 266 #define CALL_DUMMY_SIZE (16*4)
 267 #define Dest_Reg 2
 268 #define CALL_DUMMY {\
 269  MK_OP(0,RA_REGNUM,0,8),        /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
 270  0,                             /* nop    #  ... to stop raw backtrace*/\
 271  0x27bd0000,                    /* addu sp,?0 # Pseudo prologue */\
 272 /* Start here: */\
 273  MK_OP(061,SP_REGNUM,12,0),     /* lwc1 $f12,0(sp) # Reload first 4 args*/\
 274  MK_OP(061,SP_REGNUM,13,4),     /* lwc1 $f13,4(sp) */\
 275  MK_OP(061,SP_REGNUM,14,8),     /* lwc1 $f14,8(sp) */\
 276  MK_OP(061,SP_REGNUM,15,12),    /* lwc1 $f15,12(sp) */\
 277  MK_OP(043,SP_REGNUM,4,0),      /* lw $r4,0(sp) # Re-load FP regs*/\
 278  MK_OP(043,SP_REGNUM,5,4),      /* lw $r5,4(sp) */\
 279  MK_OP(043,SP_REGNUM,6,8),      /* lw $r6,8(sp) */\
 280  MK_OP(043,SP_REGNUM,7,12),     /* lw $r7,12(sp) */\
 281  (017<<26)| (Dest_Reg << 16),   /* lui $r31,<target upper 16 bits>*/\
 282  MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
 283  (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
 284  MK_OP(043,SP_REGNUM,7,12),     /* lw $r7,12(sp) */\
 285  0x5000d,                       /* bpt */\
 286 }
 287
 288 #define CALL_DUMMY_START_OFFSET 12
 289
 290 /* Insert the specified number of args and function address
 291    into a call sequence of the above form stored at DUMMYNAME.  */
 292
 293 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
 294   (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
 295    ((int*)dummyname)[12] |= (unsigned short)(fun))
 296
 297 /* Specific information about a procedure.
 298    This overlays the MIPS's PDR records,
 299    mipsread.c (ab)uses this to save memory */
 300
 301 typedef struct mips_extra_func_info {
 302         long    numargs;        /* number of args to procedure (was iopt) */
 303         PDR     pdr;            /* Procedure descriptor record */
 304 } *mips_extra_func_info_t;
 305
 306 #define EXTRA_FRAME_INFO \
 307   mips_extra_func_info_t proc_desc; \
 308   int num_args;\
 309   struct frame_saved_regs *saved_regs;
 310
 311 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
 312
 313 /* Size of elements in jmpbuf */
 314
 315 #define JB_ELEMENT_SIZE 4
 316
 317 /* Figure out where the longjmp will land.  We expect that we have just entered
 318    longjmp and haven't yet setup the stack frame, so the args are still in the
 319    argument regs.  a0 (CALL_ARG0) points at the jmp_buf structure from which we
 320    extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
 321    This routine returns true on success */
 322
 323 /* Note that caller must #include <setjmp.h> in order to get def of JB_* */
 324 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)