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