gdb/config/arm/tm-arm.h

   1 /* Definitions to make GDB target for an ARM
   2    Copyright 1986, 1987, 1989, 1991, 1993, 1997, 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #ifdef __STDC__         /* Forward decls for prototypes */
  21 struct type;
  22 struct value;
  23 #endif
  24
  25 #define TARGET_BYTE_ORDER_SELECTABLE
  26
  27 /* IEEE format floating point */
  28
  29 #define IEEE_FLOAT
  30
  31 /* FIXME: may need a floatformat_ieee_double_bigbyte_littleword format for
  32    BIG_ENDIAN use. -fnf */
  33
  34 #define TARGET_DOUBLE_FORMAT (target_byte_order == BIG_ENDIAN \
  35                               ? &floatformat_ieee_double_big \
  36                               : &floatformat_ieee_double_littlebyte_bigword)
  37
  38 /* When reading symbols, we need to zap the low bit of the address, which
  39    may be set to 1 for Thumb functions.  */
  40
  41 #define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x1)
  42
  43 /* Remove useless bits from addresses in a running program.  */
  44
  45 CORE_ADDR arm_addr_bits_remove PARAMS ((CORE_ADDR));
  46
  47 #define ADDR_BITS_REMOVE(val) (arm_addr_bits_remove (val))
  48
  49 /* Offset from address of function to start of its code.
  50    Zero on most machines.  */
  51
  52 #define FUNCTION_START_OFFSET 0
  53
  54 /* Advance PC across any function entry prologue instructions
  55    to reach some "real" code.  */
  56
  57 extern CORE_ADDR arm_skip_prologue PARAMS ((CORE_ADDR pc));
  58
  59 #define SKIP_PROLOGUE(pc) { pc = arm_skip_prologue (pc); }
  60
  61 /* Immediately after a function call, return the saved pc.
  62    Can't always go through the frames for this because on some machines
  63    the new frame is not set up until the new function executes
  64    some instructions.  */
  65
  66 #define SAVED_PC_AFTER_CALL(frame) arm_saved_pc_after_call (frame)
  67 struct frame_info;
  68 extern CORE_ADDR arm_saved_pc_after_call PARAMS ((struct frame_info *));
  69
  70 /* I don't know the real values for these.  */
  71 #define TARGET_UPAGES UPAGES
  72 #define TARGET_NBPG NBPG
  73
  74 /* Address of end of stack space.  */
  75
  76 #define STACK_END_ADDR (0x01000000 - (TARGET_UPAGES * TARGET_NBPG))
  77
  78 /* Stack grows downward.  */
  79
  80 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  81
  82 /* !!!! if we're using RDP, then we're inserting breakpoints and storing
  83    their handles instread of what was in memory.  It is nice that
  84    this is the same size as a handle - otherwise remote-rdp will
  85    have to change. */
  86
  87 /* BREAKPOINT_FROM_PC uses the program counter value to determine whether a
  88    16- or 32-bit breakpoint should be used.  It returns a pointer
  89    to a string of bytes that encode a breakpoint instruction, stores
  90    the length of the string to *lenptr, and adjusts the pc (if necessary) to
  91    point to the actual memory location where the breakpoint should be
  92    inserted.  */
  93
  94 extern breakpoint_from_pc_fn arm_breakpoint_from_pc;
  95 #define BREAKPOINT_FROM_PC(pcptr, lenptr) arm_breakpoint_from_pc (pcptr, lenptr)
  96
  97 /* Amount PC must be decremented by after a breakpoint.
  98    This is often the number of bytes in BREAKPOINT
  99    but not always.  */
 100
 101 #define DECR_PC_AFTER_BREAK 0
 102
 103 /* code to execute to print interesting information about the
 104  * floating point processor (if any)
 105  * No need to define if there is nothing to do.
 106  */
 107 #define FLOAT_INFO { arm_float_info (); }
 108
 109 /* Say how long (ordinary) registers are.  This is a piece of bogosity
 110    used in push_word and a few other places; REGISTER_RAW_SIZE is the
 111    real way to know how big a register is.  */
 112
 113 #define REGISTER_SIZE 4
 114
 115 /* Number of machine registers */
 116
 117 /* Note: I make a fake copy of the pc in register 25 (calling it ps) so
 118    that I can clear the status bits from pc (register 15) */
 119
 120 #define NUM_REGS 26
 121
 122 /* An array of names of registers. */
 123
 124 extern char **arm_register_names;
 125 #define REGISTER_NAME(i) arm_register_names[i]
 126
 127 /* Register numbers of various important registers.
 128    Note that some of these values are "real" register numbers,
 129    and correspond to the general registers of the machine,
 130    and some are "phony" register numbers which are too large
 131    to be actual register numbers as far as the user is concerned
 132    but do serve to get the desired values when passed to read_register.  */
 133
 134 #define A1_REGNUM 0             /* first integer-like argument */
 135 #define A4_REGNUM 3             /* last integer-like argument */
 136 #define AP_REGNUM 11
 137 #define FP_REGNUM 11            /* Contains address of executing stack frame */
 138 #define SP_REGNUM 13            /* Contains address of top of stack */
 139 #define LR_REGNUM 14            /* address to return to from a function call */
 140 #define PC_REGNUM 15            /* Contains program counter */
 141 #define F0_REGNUM 16            /* first floating point register */
 142 #define F3_REGNUM 19            /* last floating point argument register */
 143 #define F7_REGNUM 23            /* last floating point register */
 144 #define FPS_REGNUM 24           /* floating point status register */
 145 #define PS_REGNUM 25            /* Contains processor status */
 146
 147 #define THUMB_FP_REGNUM 7       /* R7 is frame register on Thumb */
 148
 149 #define ARM_NUM_ARG_REGS        4
 150 #define ARM_LAST_ARG_REGNUM     A4_REGNUM
 151 #define ARM_NUM_FP_ARG_REGS     4
 152 #define ARM_LAST_FP_ARG_REGNUM  F3_REGNUM
 153
 154 /* Instruction condition field values.  */
 155 #define INST_EQ         0x0
 156 #define INST_NE         0x1
 157 #define INST_CS         0x2
 158 #define INST_CC         0x3
 159 #define INST_MI         0x4
 160 #define INST_PL         0x5
 161 #define INST_VS         0x6
 162 #define INST_VC         0x7
 163 #define INST_HI         0x8
 164 #define INST_LS         0x9
 165 #define INST_GE         0xa
 166 #define INST_LT         0xb
 167 #define INST_GT         0xc
 168 #define INST_LE         0xd
 169 #define INST_AL         0xe
 170 #define INST_NV         0xf
 171
 172 #define FLAG_N          0x80000000
 173 #define FLAG_Z          0x40000000
 174 #define FLAG_C          0x20000000
 175 #define FLAG_V          0x10000000
 176
 177
 178
 179 /* Total amount of space needed to store our copies of the machine's
 180    register state, the array `registers'.  */
 181 #define REGISTER_BYTES (16*4 + 12*8 + 4 + 4)
 182
 183 /* Index within `registers' of the first byte of the space for
 184    register N.  */
 185
 186 #define REGISTER_BYTE(N) (((N) < F0_REGNUM) ? (N)*4 : \
 187                           (((N) < PS_REGNUM) ? 16*4 + ((N) - 16)*12 : \
 188                            16*4 + 8*12 + ((N) - FPS_REGNUM) * 4))
 189
 190 /* Number of bytes of storage in the actual machine representation
 191    for register N.  On the vax, all regs are 4 bytes.  */
 192
 193 #define REGISTER_RAW_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 12)
 194
 195 /* Number of bytes of storage in the program's representation
 196    for register N.  On the vax, all regs are 4 bytes.  */
 197
 198 #define REGISTER_VIRTUAL_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 8)
 199
 200 /* Largest value REGISTER_RAW_SIZE can have.  */
 201
 202 #define MAX_REGISTER_RAW_SIZE 12
 203
 204 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 205
 206 #define MAX_REGISTER_VIRTUAL_SIZE 8
 207
 208 /* Nonzero if register N requires conversion
 209    from raw format to virtual format.  */
 210 #define REGISTER_CONVERTIBLE(N) ((unsigned)(N) - F0_REGNUM < 8)
 211
 212 /* Convert data from raw format for register REGNUM in buffer FROM
 213    to virtual format with type TYPE in buffer TO.  */
 214
 215 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
 216 { \
 217   double val; \
 218   convert_from_extended ((FROM), & val); \
 219   store_floating ((TO), TYPE_LENGTH (TYPE), val); \
 220 }
 221
 222 /* Convert data from virtual format with type TYPE in buffer FROM
 223    to raw format for register REGNUM in buffer TO.  */
 224
 225 #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO)    \
 226 { \
 227   double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
 228   convert_to_extended (&val, (TO)); \
 229 }
 230 /* Return the GDB type object for the "standard" data type
 231    of data in register N.  */
 232
 233 #define REGISTER_VIRTUAL_TYPE(N) \
 234  (((unsigned)(N) - F0_REGNUM) < 8 ? builtin_type_double : builtin_type_int)
 235 \f
 236 /* The system C compiler uses a similar structure return convention to gcc */
 237 extern use_struct_convention_fn arm_use_struct_convention;
 238 #define USE_STRUCT_CONVENTION(gcc_p, type) arm_use_struct_convention (gcc_p, type)
 239
 240 /* Store the address of the place in which to copy the structure the
 241    subroutine will return.  This is called from call_function. */
 242
 243 #define STORE_STRUCT_RETURN(ADDR, SP) \
 244   { write_register (0, (ADDR)); }
 245
 246 /* Extract from an array REGBUF containing the (raw) register state
 247    a function return value of type TYPE, and copy that, in virtual format,
 248    into VALBUF.  */
 249
 250 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 251   if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)                                \
 252     convert_from_extended (REGBUF + REGISTER_BYTE (F0_REGNUM), VALBUF); \
 253   else                                                                  \
 254     memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
 255
 256 /* Write into appropriate registers a function return value
 257    of type TYPE, given in virtual format.  */
 258
 259 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 260   if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) {                              \
 261     char _buf[MAX_REGISTER_RAW_SIZE];                                   \
 262     convert_to_extended (VALBUF, _buf);                                         \
 263     write_register_bytes (REGISTER_BYTE (F0_REGNUM), _buf, MAX_REGISTER_RAW_SIZE); \
 264   } else                                                                \
 265     write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 266
 267 /* Extract from an array REGBUF containing the (raw) register state
 268    the address in which a function should return its structure value,
 269    as a CORE_ADDR (or an expression that can be used as one).  */
 270
 271 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 272
 273 /* Specify that for the native compiler variables for a particular
 274    lexical context are listed after the beginning LBRAC instead of
 275    before in the executables list of symbols.  */
 276 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (!(gcc_p))
 277
 278 \f
 279 /* Define other aspects of the stack frame.
 280    We keep the offsets of all saved registers, 'cause we need 'em a lot!
 281    We also keep the current size of the stack frame, and the offset of
 282    the frame pointer from the stack pointer (for frameless functions, and
 283    when we're still in the prologue of a function with a frame) */
 284
 285 #define EXTRA_FRAME_INFO        \
 286   struct frame_saved_regs fsr;  \
 287   int framesize;                \
 288   int frameoffset;              \
 289   int framereg;
 290
 291 extern void arm_init_extra_frame_info PARAMS ((struct frame_info *fi));
 292 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) arm_init_extra_frame_info (fi)
 293
 294 /* Return the frame address.  On ARM, it is R11; on Thumb it is R7.  */
 295 CORE_ADDR arm_target_read_fp PARAMS ((void));
 296 #define TARGET_READ_FP() arm_target_read_fp ()
 297
 298 /* Describe the pointer in each stack frame to the previous stack frame
 299    (its caller).  */
 300
 301 /* FRAME_CHAIN takes a frame's nominal address
 302    and produces the frame's chain-pointer.
 303
 304    However, if FRAME_CHAIN_VALID returns zero,
 305    it means the given frame is the outermost one and has no caller.  */
 306
 307 #define FRAME_CHAIN(thisframe) (CORE_ADDR) arm_frame_chain (thisframe)
 308 extern CORE_ADDR arm_frame_chain PARAMS ((struct frame_info *));
 309
 310 extern int arm_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
 311 #define FRAME_CHAIN_VALID(chain, thisframe) arm_frame_chain_valid (chain, thisframe)
 312
 313 /* Define other aspects of the stack frame.  */
 314
 315 /* A macro that tells us whether the function invocation represented
 316    by FI does not have a frame on the stack associated with it.  If it
 317    does not, FRAMELESS is set to 1, else 0.  */
 318 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 319 {                                                       \
 320   CORE_ADDR func_start, after_prologue;                 \
 321   func_start = (get_pc_function_start ((FI)->pc) +      \
 322                 FUNCTION_START_OFFSET);                 \
 323   after_prologue = func_start;                          \
 324   SKIP_PROLOGUE (after_prologue);                       \
 325   (FRAMELESS) = (after_prologue == func_start);         \
 326 }
 327
 328 /* Saved Pc.  */
 329
 330 #define FRAME_SAVED_PC(FRAME)   arm_frame_saved_pc (FRAME)
 331 extern CORE_ADDR arm_frame_saved_pc PARAMS ((struct frame_info *));
 332
 333 #define FRAME_ARGS_ADDRESS(fi) (fi->frame)
 334
 335 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 336
 337 /* Return number of args passed to a frame.
 338    Can return -1, meaning no way to tell.  */
 339
 340 #define FRAME_NUM_ARGS(numargs, fi) (numargs = -1)
 341
 342 /* Return number of bytes at start of arglist that are not really args.  */
 343
 344 #define FRAME_ARGS_SKIP 0
 345
 346 /* Put here the code to store, into a struct frame_saved_regs,
 347    the addresses of the saved registers of frame described by FRAME_INFO.
 348    This includes special registers such as pc and fp saved in special
 349    ways in the stack frame.  sp is even more special:
 350    the address we return for it IS the sp for the next frame.  */
 351
 352 struct frame_saved_regs;
 353 struct frame_info;
 354 void frame_find_saved_regs PARAMS((struct frame_info *fi,
 355                                    struct frame_saved_regs *fsr));
 356
 357 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 358  arm_frame_find_saved_regs (frame_info, &(frame_saved_regs));
 359
 360 \f
 361 /* Things needed for making the inferior call functions.  */
 362
 363 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 364     sp = arm_push_arguments ((nargs), (args), (sp), (struct_return), (struct_addr))
 365 extern CORE_ADDR
 366 arm_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR));
 367
 368 /* Push an empty stack frame, to record the current PC, etc.  */
 369
 370 void arm_push_dummy_frame PARAMS ((void));
 371
 372 #define PUSH_DUMMY_FRAME arm_push_dummy_frame ()
 373
 374 /* Discard from the stack the innermost frame, restoring all registers.  */
 375
 376 void arm_pop_frame PARAMS ((void));
 377
 378 #define POP_FRAME arm_pop_frame ()
 379
 380 /* This sequence of words is the instructions
 381
 382      mov        lr,pc
 383      mov        pc,r4
 384      illegal
 385
 386    Note this is 12 bytes.  */
 387
 388 #define CALL_DUMMY {0xe1a0e00f, 0xe1a0f004, 0xE7FFDEFE}
 389
 390 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 391
 392 #define CALL_DUMMY_BREAKPOINT_OFFSET arm_call_dummy_breakpoint_offset()
 393 extern int arm_call_dummy_breakpoint_offset PARAMS ((void));
 394
 395 /* Insert the specified number of args and function address
 396    into a call sequence of the above form stored at DUMMYNAME.  */
 397
 398 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
 399    arm_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p)
 400
 401 void arm_fix_call_dummy PARAMS ((char *dummy, CORE_ADDR pc, CORE_ADDR fun,
 402                                  int nargs, struct value **args,
 403                                  struct type *type, int gcc_p));
 404
 405 CORE_ADDR arm_get_next_pc PARAMS ((CORE_ADDR));
 406
 407 /* Functions for dealing with Thumb call thunks.  */
 408 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name)      arm_in_call_stub (pc, name)
 409 #define SKIP_TRAMPOLINE_CODE(pc)                arm_skip_stub (pc)
 410 extern int arm_in_call_stub PARAMS ((CORE_ADDR pc,  char *name));
 411 extern CORE_ADDR arm_skip_stub PARAMS ((CORE_ADDR pc));
 412
 413 /* Function to determine whether MEMADDR is in a Thumb function.  */
 414 extern int arm_pc_is_thumb PARAMS ((bfd_vma memaddr));
 415
 416 /* Function to determine whether MEMADDR is in a call dummy called from
 417    a Thumb function.  */
 418 extern int arm_pc_is_thumb_dummy PARAMS ((bfd_vma memaddr));
 419
 420 /* Macros for setting and testing a bit in a minimal symbol that
 421    marks it as Thumb function.  The MSB of the minimal symbol's
 422    "info" field is used for this purpose. This field is already
 423    being used to store the symbol size, so the assumption is
 424    that the symbol size cannot exceed 2^31.
 425
 426    COFF_MAKE_MSYMBOL_SPECIAL
 427    ELF_MAKE_MSYMBOL_SPECIAL     tests whether the COFF or ELF symbol corresponds
 428                         to a thumb function, and sets a "special" bit in a
 429                         minimal symbol to indicate that it does
 430    MSYMBOL_SET_SPECIAL  actually sets the "special" bit
 431    MSYMBOL_IS_SPECIAL   tests the "special" bit in a minimal symbol
 432    MSYMBOL_SIZE         returns the size of the minimal symbol, i.e.
 433                         the "info" field with the "special" bit masked out
 434 */
 435
 436 extern int coff_sym_is_thumb(int val);
 437 #define MSYMBOL_SET_SPECIAL(msym) \
 438     MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) | 0x80000000)
 439 #define MSYMBOL_IS_SPECIAL(msym) \
 440   (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
 441 #define MSYMBOL_SIZE(msym) \
 442   ((long) MSYMBOL_INFO (msym) & 0x7fffffff)
 443
 444 /* Thumb symbol are of type STT_LOPROC, (synonymous with STT_ARM_TFUNC) */
 445 #define ELF_MAKE_MSYMBOL_SPECIAL(sym,msym) \
 446  { if(ELF_ST_TYPE(((elf_symbol_type *)(sym))->internal_elf_sym.st_info) == STT_LOPROC) \
 447         MSYMBOL_SET_SPECIAL(msym); }
 448
 449 #define COFF_MAKE_MSYMBOL_SPECIAL(val,msym) \
 450  { if(coff_sym_is_thumb(val)) MSYMBOL_SET_SPECIAL(msym); }
 451
 452 #undef  IN_SIGTRAMP
 453 #define IN_SIGTRAMP(pc, name) 0