gdb/config/arc/tm-arc.h

   1 /* Parameters for target machine ARC, for GDB, the GNU debugger.
   2    Copyright (C) 1995 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.
   4
   5 This file is part of GDB.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 /* Used by arc-tdep.c to set the default cpu type.  */
  22 #define DEFAULT_ARC_CPU_TYPE "base"
  23
  24 /* Byte order is selectable.  */
  25 #define TARGET_BYTE_ORDER_SELECTABLE
  26
  27 /* We have IEEE floating point, if we have any float at all.  */
  28 #define IEEE_FLOAT
  29
  30 /* Offset from address of function to start of its code.
  31    Zero on most machines.  */
  32 #define FUNCTION_START_OFFSET 0
  33
  34 /* Advance PC across any function entry prologue instructions
  35    to reach some "real" code.  SKIP_PROLOGUE_FRAMELESS_P advances
  36    the PC past some of the prologue, but stops as soon as it
  37    knows that the function has a frame.  Its result is equal
  38    to its input PC if the function is frameless, unequal otherwise.  */
  39
  40 #define SKIP_PROLOGUE(pc) \
  41   { pc = skip_prologue (pc, 0); }
  42 #define SKIP_PROLOGUE_FRAMELESS_P(pc) \
  43   { pc = skip_prologue (pc, 1); }
  44 extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR, int));
  45
  46 /* Sequence of bytes for breakpoint instruction.
  47    ??? The current value is "sr -1,[-1]" and is for the simulator only.
  48    The simulator watches for this and does the right thing.
  49    The hardware version will have to associate with each breakpoint
  50    the sequence "flag 1; nop; nop; nop".  IE: The breakpoint insn will not
  51    be a fixed set of bits but instead will be a branch to a semi-random
  52    address.  Presumably this will be cleaned up for "second silicon".  */
  53 #define BIG_BREAKPOINT { 0x12, 0x1f, 0xff, 0xff }
  54 #define LITTLE_BREAKPOINT { 0xff, 0xff, 0x1f, 0x12 }
  55
  56 /* Given the exposed pipeline, there isn't any one correct value.
  57    However, this value must be 4.  GDB can't handle any other value (other than
  58    zero).  See for example infrun.c:
  59    "prev_pc != stop_pc - DECR_PC_AFTER_BREAK"  */
  60 /* FIXME */
  61 #define DECR_PC_AFTER_BREAK 8
  62
  63 /* We don't have a reliable single step facility.
  64    ??? We do have a cycle single step facility, but that won't work.  */
  65 #define SOFTWARE_SINGLE_STEP_P 1
  66 extern void arc_software_single_step PARAMS ((unsigned int, int));
  67 #define SOFTWARE_SINGLE_STEP(sig,bp_p) arc_software_single_step (sig, bp_p)
  68
  69 /* FIXME: Need to set STEP_SKIPS_DELAY.  */
  70
  71 /* Given a pc value as defined by the hardware, return the real address.
  72    Remember that on the ARC blink contains that status register which
  73    includes PC + flags (so we have to mask out the flags).  */
  74 #define ARC_PC_TO_REAL_ADDRESS(pc) (((pc) & 0xffffff) << 2)
  75
  76 /* Immediately after a function call, return the saved pc.
  77    Can't always go through the frames for this because on some machines
  78    the new frame is not set up until the new function
  79    executes some instructions.  */
  80
  81 #define SAVED_PC_AFTER_CALL(frame) \
  82   (ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM)))
  83
  84 /* Stack grows upward */
  85
  86 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  87
  88 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  89    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  90    real way to know how big a register is.  */
  91 #define REGISTER_SIZE 4
  92
  93 /* Number of machine registers */
  94 #define NUM_REGS 92
  95
  96 /* Initializer for an array of names of registers.
  97    There should be NUM_REGS strings in this initializer.  */
  98
  99 #define REGISTER_NAMES \
 100 { \
 101     /*  0 */ "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7", \
 102     /*  8 */ "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15", \
 103     /* 16 */ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
 104     /* 24 */ "r24", "r25", "r26", "fp", "sp", "ilink1", "ilink2", "blink", \
 105     /* 32 */ "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", \
 106     /* 40 */ "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47", \
 107     /* 48 */ "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55", \
 108     /* 56 */ "r56", "mlo", "mmid", "mhi", "lp_count", \
 109     /* 61 */ "status", "sema", "lp_start", "lp_end", "identity", "debug", \
 110     /* 67 */ "aux10", "aux11", "aux12", "aux13", "aux14", \
 111     /* 72 */ "aux15", "aux16", "aux17", "aux18", "aux19", \
 112     /* 77 */ "aux1a", "aux1b", "aux1c", "aux1d", "aux1e", \
 113     /* 82 */ "aux1f", "aux20", "aux21", "aux22", \
 114     /* 86 */ "aux30", "aux31", "aux32", "aux33", "aux40", \
 115     /* 91 */ "pc" \
 116 }
 117
 118 /* Register numbers of various important registers (used to index
 119    into arrays of register names and register values).  */
 120
 121 #define R0_REGNUM   0      /* First local register              */
 122 #define R59_REGNUM 59      /* Last local register               */
 123 #define FP_REGNUM  27      /* Contains address of executing stack frame */
 124 #define SP_REGNUM  28      /* stack pointer */
 125 #define BLINK_REGNUM 31    /* link register */
 126 #define STA_REGNUM 61      /* processor status word */
 127 #define PC_REGNUM  91      /* instruction pointer */
 128 #define AUX_BEG_REGNUM  61 /* aux reg begins */
 129 #define AUX_END_REGNUM  90 /* aux reg ends, pc not real aux reg */
 130
 131 /* Fake registers used to mark immediate data.  */
 132 #define SHIMM_FLAG_REGNUM 61
 133 #define LIMM_REGNUM 62
 134 #define SHIMM_REGNUM 63
 135
 136 #define AUX_REG_MAP \
 137 { \
 138    {  0,  1,  2,  3,  4,  5, \
 139      16, -1, -1, -1, -1, \
 140      -1, -1, -1, -1, -1, \
 141      -1, -1, -1, -1, 30, \
 142      -1, 32, 33, -1, \
 143       48, 49, 50, 51, 64, \
 144       0 \
 145     }, \
 146    {  0,  1,  2,  3,  4,  5, \
 147      16, -1, -1, -1, -1, \
 148      -1, -1, -1, -1, -1, \
 149      -1, -1, -1, -1, 30, \
 150      31, 32, 33, -1, \
 151      -1, -1, -1, -1, -1, \
 152       0 \
 153     }, \
 154    {  0,  1,  2,  3,  4,  5, \
 155       16, 17, 18, 19, 20, \
 156       21, 22, 23, 24, 25, \
 157       26, 27, 28, 29, 30, \
 158       31, 32, 33, 34, \
 159      -1, -1, -1, -1, -1, \
 160       0 \
 161     } \
 162 }
 163
 164 #define PFP_REGNUM R0_REGNUM    /* Previous frame pointer       */
 165
 166 /* Total amount of space needed to store our copies of the machine's
 167    register state, the array `registers'.  */
 168 #define REGISTER_BYTES (NUM_REGS * 4)
 169
 170 /* Index within `registers' of the first byte of the space for register N.  */
 171 #define REGISTER_BYTE(N) (4*(N))
 172
 173 /* Number of bytes of storage in the actual machine representation
 174    for register N. */
 175 #define REGISTER_RAW_SIZE(N) 4
 176
 177 /* Number of bytes of storage in the program's representation for register N. */
 178 #define REGISTER_VIRTUAL_SIZE(N) 4
 179
 180 /* Largest value REGISTER_RAW_SIZE can have.  */
 181 #define MAX_REGISTER_RAW_SIZE 4
 182
 183 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 184 #define MAX_REGISTER_VIRTUAL_SIZE 4
 185
 186 /* Return the GDB type object for the "standard" data type
 187    of data in register N.  */
 188 #define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int)
 189
 190 \f
 191 /* Macros for understanding function return values... */
 192
 193 /* Does the specified function use the "struct returning" convention
 194    or the "value returning" convention?  The "value returning" convention
 195    almost invariably returns the entire value in registers.  The
 196    "struct returning" convention often returns the entire value in
 197    memory, and passes a pointer (out of or into the function) saying
 198    where the value (is or should go).
 199
 200    Since this sometimes depends on whether it was compiled with GCC,
 201    this is also an argument.  This is used in call_function to build a
 202    stack, and in value_being_returned to print return values.
 203
 204    On arc, a structure is always retunred with pointer in r0. */
 205
 206 #define USE_STRUCT_CONVENTION(gcc_p, type) 1
 207
 208 /* Extract from an array REGBUF containing the (raw) register state
 209    a function return value of type TYPE, and copy that, in virtual format,
 210    into VALBUF.  This is only called if USE_STRUCT_CONVENTION for this
 211    type is 0.
 212 */
 213 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 214         memcpy(VALBUF, REGBUF+REGISTER_BYTE(R0_REGNUM), TYPE_LENGTH (TYPE))
 215
 216 /* If USE_STRUCT_CONVENTION produces a 1,
 217    extract from an array REGBUF containing the (raw) register state
 218    the address in which a function should return its structure value,
 219    as a CORE_ADDR (or an expression that can be used as one). */
 220 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 221    (error("Don't know where large structure is returned on arc"), 0)
 222
 223 /* Write into appropriate registers a function return value
 224    of type TYPE, given in virtual format, for "value returning" functions.
 225    For 'return' command:  not (yet) implemented for arc.  */
 226 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 227     error ("Returning values from functions is not implemented in arc gdb")
 228
 229 /* Store the address of the place in which to copy the structure the
 230    subroutine will return.  This is called from call_function. */
 231 #define STORE_STRUCT_RETURN(ADDR, SP) \
 232     error ("Returning values from functions is not implemented in arc gdb")
 233
 234 \f
 235 /* Describe the pointer in each stack frame to the previous stack frame
 236    (its caller).  */
 237
 238 /* We cache information about saved registers in the frame structure,
 239    to save us from having to re-scan function prologues every time
 240    a register in a non-current frame is accessed.  */
 241
 242 #define EXTRA_FRAME_INFO \
 243         struct frame_saved_regs *fsr; \
 244         CORE_ADDR arg_pointer;
 245
 246 /* Zero the frame_saved_regs pointer when the frame is initialized,
 247    so that FRAME_FIND_SAVED_REGS () will know to allocate and
 248    initialize a frame_saved_regs struct the first time it is called.
 249    Set the arg_pointer to -1, which is not valid; 0 and other values
 250    indicate real, cached values.  */
 251
 252 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
 253         ((fi)->fsr = 0, (fi)->arg_pointer = -1)
 254
 255 /* FRAME_CHAIN takes a frame's nominal address
 256    and produces the frame's chain-pointer.
 257    However, if FRAME_CHAIN_VALID returns zero,
 258    it means the given frame is the outermost one and has no caller.  */
 259 /* On the arc, we get the chain pointer by reading the PFP saved
 260    on the stack. */
 261 /* The PFP and RPC is in fp and fp+4.  */
 262
 263 #define FRAME_CHAIN(thisframe) \
 264   (read_memory_integer (FRAME_FP (thisframe), 4))
 265
 266 /* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one
 267    and has no caller.  */
 268 #define FRAME_CHAIN_VALID(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe)
 269
 270 /* A macro that tells us whether the function invocation represented
 271    by FI does not have a frame on the stack associated with it.  If it
 272    does not, FRAMELESS is set to 1, else 0.  */
 273
 274 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 275   do { \
 276     if ((FI)->signal_handler_caller) \
 277       (FRAMELESS) = 0; \
 278     else \
 279       (FRAMELESS) = frameless_look_for_prologue (FI); \
 280   } while (0)
 281
 282 /* Where is the PC for a specific frame.
 283    A leaf function may never save blink, so we have to check for that here.  */
 284
 285 #define FRAME_SAVED_PC(frame) (arc_frame_saved_pc (frame))
 286 struct frame_info; /* in case frame.h not included yet */
 287 CORE_ADDR arc_frame_saved_pc PARAMS ((struct frame_info *));
 288
 289 /* If the argument is on the stack, it will be here.
 290    We cache this value in the frame info if we've already looked it up.  */
 291 /* ??? Is the arg_pointer check necessary?  */
 292
 293 #define FRAME_ARGS_ADDRESS(fi) \
 294   (((fi)->arg_pointer != -1) ? (fi)->arg_pointer : (fi)->frame)
 295
 296 /* This is the same except it should return 0 when
 297    it does not really know where the args are, rather than guessing.
 298    This value is not cached since it is only used infrequently.  */
 299
 300 #define FRAME_LOCALS_ADDRESS(fi)        ((fi)->frame)
 301
 302 /* Set NUMARGS to the number of args passed to a frame.
 303    Can return -1, meaning no way to tell.  */
 304
 305 #define FRAME_NUM_ARGS(numargs, fi)     (numargs = -1)
 306
 307 /* Return number of bytes at start of arglist that are not really args.  */
 308
 309 #define FRAME_ARGS_SKIP 0
 310
 311 /* Produce the positions of the saved registers in a stack frame.  */
 312
 313 #define FRAME_FIND_SAVED_REGS(frame_info_addr, sr) \
 314         frame_find_saved_regs (frame_info_addr, &sr)
 315 extern void frame_find_saved_regs();            /* See arc-tdep.c */
 316
 317 \f
 318 /* Things needed for making calls to functions in the inferior process */
 319 #define PUSH_DUMMY_FRAME \
 320         push_dummy_frame ()
 321
 322 /* Discard from the stack the innermost frame, restoring all registers.  */
 323 #define POP_FRAME \
 324         pop_frame ()
 325
 326 /* This sequence of words is the instructions  bl xxxx, flag 1 */
 327 #define CALL_DUMMY { 0x28000000, 0x1fbe8001 }
 328 #define CALL_DUMMY_LENGTH 8
 329
 330 /* Start execution at beginning of dummy */
 331 #define CALL_DUMMY_START_OFFSET 0
 332
 333 /* Insert the specified number of args and function address
 334    into a call sequence of the above form stored at 'dummyname'.*/
 335 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
 336 { \
 337         int from, to, delta, loc; \
 338         loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
 339         from = loc + 4; \
 340         to = (int)(fun); \
 341         delta = (to - from) >> 2; \
 342         *((char *)(dummyname) + 1) = (delta & 0x1); \
 343         *((char *)(dummyname) + 2) = ((delta >> 1) & 0xff); \
 344         *((char *)(dummyname) + 3) = ((delta >> 9) & 0xff); \
 345         *((char *)(dummyname) + 4) = ((delta >> 17) & 0x7); \
 346 }
 347