gdb/config/alpha/tm-alpha.h

   1 /* Definitions to make GDB run on an Alpha box under OSF1.  This is
   2    also used by the Alpha/Netware and Alpha/Linux targets.
   3    Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2002
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #ifndef TM_ALPHA_H
  24 #define TM_ALPHA_H
  25
  26 #include "regcache.h"
  27 #include "bfd.h"
  28 #include "coff/sym.h"           /* Needed for PDR below.  */
  29 #include "coff/symconst.h"
  30
  31 struct frame_info;
  32 struct type;
  33 struct value;
  34 struct symbol;
  35
  36 #if !defined (TARGET_BYTE_ORDER)
  37 #define TARGET_BYTE_ORDER BFD_ENDIAN_LITTLE
  38 #endif
  39
  40 /* Redefine some target bit sizes from the default.  */
  41
  42 #define TARGET_LONG_BIT 64
  43 #define TARGET_LONG_LONG_BIT 64
  44 #define TARGET_PTR_BIT 64
  45
  46 /* Floating point is IEEE compliant */
  47 #define IEEE_FLOAT (1)
  48
  49 /* Number of traps that happen between exec'ing the shell
  50  * to run an inferior, and when we finally get to
  51  * the inferior code.  This is 2 on most implementations.
  52  */
  53 #define START_INFERIOR_TRAPS_EXPECTED 3
  54
  55 /* Offset from address of function to start of its code.
  56    Zero on most machines.  */
  57
  58 #define FUNCTION_START_OFFSET 0
  59
  60 /* Advance PC across any function entry prologue instructions
  61    to reach some "real" code.  */
  62
  63 #define SKIP_PROLOGUE(pc)       (alpha_skip_prologue(pc, 0))
  64 extern CORE_ADDR alpha_skip_prologue (CORE_ADDR addr, int lenient);
  65
  66 /* Immediately after a function call, return the saved pc.
  67    Can't always go through the frames for this because on some machines
  68    the new frame is not set up until the new function executes
  69    some instructions.  */
  70
  71 #define SAVED_PC_AFTER_CALL(frame)      alpha_saved_pc_after_call(frame)
  72 extern CORE_ADDR alpha_saved_pc_after_call (struct frame_info *);
  73
  74 /* Are we currently handling a signal ?  */
  75
  76 #define IN_SIGTRAMP(pc, name) alpha_osf_in_sigtramp ((pc), (name))
  77 extern int alpha_osf_in_sigtramp (CORE_ADDR, char *);
  78
  79 /* Stack grows downward.  */
  80
  81 #define INNER_THAN(lhs,rhs) core_addr_lessthan ((lhs), (rhs))
  82
  83 #define BREAKPOINT {0x80, 0, 0, 0}      /* call_pal bpt */
  84
  85 /* Amount PC must be decremented by after a breakpoint.
  86    This is often the number of bytes in BREAKPOINT
  87    but not always.  */
  88
  89 #ifndef DECR_PC_AFTER_BREAK
  90 #define DECR_PC_AFTER_BREAK 4
  91 #endif
  92
  93 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  94    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  95    real way to know how big a register is.  */
  96
  97 #define REGISTER_SIZE 8
  98
  99 /* Number of machine registers */
 100
 101 #define NUM_REGS 66
 102
 103
 104 /* Return the name of register REGNO.  */
 105
 106 #define REGISTER_NAME(regno) alpha_register_name ((regno))
 107 extern char *alpha_register_name (int);
 108
 109
 110 /* Register numbers of various important registers.
 111    Note that most of these values are "real" register numbers,
 112    and correspond to the general registers of the machine,
 113    and FP_REGNUM is a "phony" register number which is too large
 114    to be an actual register number as far as the user is concerned
 115    but serves to get the desired value when passed to read_register.  */
 116
 117 #define V0_REGNUM 0             /* Function integer return value */
 118 #define T7_REGNUM 8             /* Return address register for OSF/1 __add* */
 119 #define GCC_FP_REGNUM 15        /* Used by gcc as frame register */
 120 #define A0_REGNUM 16            /* Loc of first arg during a subr call */
 121 #define T9_REGNUM 23            /* Return address register for OSF/1 __div* */
 122 #define T12_REGNUM 27           /* Contains start addr of current proc */
 123 #define SP_REGNUM 30            /* Contains address of top of stack */
 124 #define RA_REGNUM 26            /* Contains return address value */
 125 #define ZERO_REGNUM 31          /* Read-only register, always 0 */
 126 #define FP0_REGNUM 32           /* Floating point register 0 */
 127 #define FPA0_REGNUM 48          /* First float arg during a subr call */
 128 #define FPCR_REGNUM 63          /* Floating point control register */
 129 #define PC_REGNUM 64            /* Contains program counter */
 130 #define FP_REGNUM 65            /* Virtual frame pointer */
 131
 132 #define CANNOT_FETCH_REGISTER(regno) \
 133   alpha_cannot_fetch_register ((regno))
 134 extern int alpha_cannot_fetch_register (int);
 135
 136 #define CANNOT_STORE_REGISTER(regno) \
 137   alpha_cannot_store_register ((regno))
 138 extern int alpha_cannot_store_register (int);
 139
 140 /* Total amount of space needed to store our copies of the machine's
 141    register state, the array `registers'.  */
 142 #define REGISTER_BYTES (NUM_REGS * 8)
 143
 144 /* Index within `registers' of the first byte of the space for
 145    register N.  */
 146
 147 #define REGISTER_BYTE(N) ((N) * 8)
 148
 149 /* Number of bytes of storage in the actual machine representation
 150    for register N.  On Alphas, all regs are 8 bytes.  */
 151
 152 #define REGISTER_RAW_SIZE(N) 8
 153
 154 /* Number of bytes of storage in the program's representation
 155    for register N.  On Alphas, all regs are 8 bytes.  */
 156
 157 #define REGISTER_VIRTUAL_SIZE(N) 8
 158
 159 /* Largest value REGISTER_RAW_SIZE can have.  */
 160
 161 #define MAX_REGISTER_RAW_SIZE 8
 162
 163 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 164
 165 #define MAX_REGISTER_VIRTUAL_SIZE 8
 166
 167 /* Nonzero if register N requires conversion
 168    from raw format to virtual format.
 169    The alpha needs a conversion between register and memory format if
 170    the register is a floating point register and
 171    memory format is float, as the register format must be double
 172    or
 173    memory format is an integer with 4 bytes or less, as the representation
 174    of integers in floating point registers is different. */
 175
 176 #define REGISTER_CONVERTIBLE(N) alpha_register_convertible ((N))
 177 extern int alpha_register_convertible (int);
 178
 179 /* Convert data from raw format for register REGNUM in buffer FROM
 180    to virtual format with type TYPE in buffer TO.  */
 181
 182 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM, TYPE, FROM, TO) \
 183   alpha_register_convert_to_virtual (REGNUM, TYPE, FROM, TO)
 184 extern void
 185 alpha_register_convert_to_virtual (int, struct type *, char *, char *);
 186
 187 /* Convert data from virtual format with type TYPE in buffer FROM
 188    to raw format for register REGNUM in buffer TO.  */
 189
 190 #define REGISTER_CONVERT_TO_RAW(TYPE, REGNUM, FROM, TO) \
 191   alpha_register_convert_to_raw (TYPE, REGNUM, FROM, TO)
 192 extern void
 193 alpha_register_convert_to_raw (struct type *, int, char *, char *);
 194
 195 /* Return the GDB type object for the "standard" data type
 196    of data in register N.  */
 197
 198 #define REGISTER_VIRTUAL_TYPE(N) alpha_register_virtual_type ((N))
 199 extern struct type * alpha_register_virtual_type (int);
 200
 201 /* Store the address of the place in which to copy the structure the
 202    subroutine will return.  Handled by alpha_push_arguments.  */
 203
 204 #define STORE_STRUCT_RETURN(addr, sp) \
 205   alpha_store_struct_return ((addr), (sp))
 206 extern void alpha_store_struct_return (CORE_ADDR, CORE_ADDR);
 207 /**/
 208
 209 /* Extract from an array REGBUF containing the (raw) register state
 210    a function return value of type TYPE, and copy that, in virtual format,
 211    into VALBUF.  */
 212
 213 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 214   alpha_extract_return_value(TYPE, REGBUF, VALBUF)
 215 extern void alpha_extract_return_value (struct type *, char *, char *);
 216
 217 /* Write into appropriate registers a function return value
 218    of type TYPE, given in virtual format.  */
 219
 220 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 221   alpha_store_return_value(TYPE, VALBUF)
 222 extern void alpha_store_return_value (struct type *, char *);
 223
 224 /* Extract from an array REGBUF containing the (raw) register state
 225    the address in which a function should return its structure value,
 226    as a CORE_ADDR (or an expression that can be used as one).  */
 227 /* The address is passed in a0 upon entry to the function, but when
 228    the function exits, the compiler has copied the value to v0.  This
 229    convention is specified by the System V ABI, so I think we can rely
 230    on it.  */
 231
 232 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 233   alpha_extract_struct_value_address (REGBUF)
 234 extern CORE_ADDR alpha_extract_struct_value_address (char *);
 235
 236 /* Structures are returned by ref in extra arg0 */
 237 #define USE_STRUCT_CONVENTION(gcc_p, type) \
 238   alpha_use_struct_convention ((gcc_p), (type))
 239 extern int alpha_use_struct_convention (int, struct type *);
 240 \f
 241
 242 /* Describe the pointer in each stack frame to the previous stack frame
 243    (its caller).  */
 244
 245 /* FRAME_CHAIN takes a frame's nominal address
 246    and produces the frame's chain-pointer. */
 247
 248 #define FRAME_CHAIN(thisframe) alpha_frame_chain (thisframe)
 249 extern CORE_ADDR alpha_frame_chain (struct frame_info *);
 250
 251 /* Define other aspects of the stack frame.  */
 252
 253
 254 /* An expression that tells us whether the function invocation represented
 255    by FI does not have a frame on the stack associated with it. */
 256 /* We handle this differently for alpha, and maybe we should not */
 257
 258 #define FRAMELESS_FUNCTION_INVOCATION(FI)  (0)
 259
 260 /* Saved Pc.  */
 261
 262 #define FRAME_SAVED_PC(FRAME)   (alpha_frame_saved_pc(FRAME))
 263 extern CORE_ADDR alpha_frame_saved_pc (struct frame_info *);
 264
 265 /* The alpha has two different virtual pointers for arguments and locals.
 266
 267    The virtual argument pointer is pointing to the bottom of the argument
 268    transfer area, which is located immediately below the virtual frame
 269    pointer. Its size is fixed for the native compiler, it is either zero
 270    (for the no arguments case) or large enough to hold all argument registers.
 271    gcc uses a variable sized argument transfer area. As it has
 272    to stay compatible with the native debugging tools it has to use the same
 273    virtual argument pointer and adjust the argument offsets accordingly.
 274
 275    The virtual local pointer is localoff bytes below the virtual frame
 276    pointer, the value of localoff is obtained from the PDR.  */
 277
 278 #define ALPHA_NUM_ARG_REGS      6
 279
 280 #define FRAME_ARGS_ADDRESS(fi) alpha_frame_args_address ((fi))
 281 extern CORE_ADDR alpha_frame_args_address (struct frame_info *);
 282
 283 #define FRAME_LOCALS_ADDRESS(fi) alpha_frame_locals_address ((fi))
 284 extern CORE_ADDR alpha_frame_locals_address (struct frame_info *);
 285
 286 /* Return number of args passed to a frame.
 287    Can return -1, meaning no way to tell.  */
 288
 289 #define FRAME_NUM_ARGS(fi)      (-1)
 290
 291 /* Return number of bytes at start of arglist that are not really args.  */
 292
 293 #define FRAME_ARGS_SKIP 0
 294
 295 /* Put here the code to store, into a struct frame_saved_regs,
 296    the addresses of the saved registers of frame described by FRAME_INFO.
 297    This includes special registers such as pc and fp saved in special
 298    ways in the stack frame.  sp is even more special:
 299    the address we return for it IS the sp for the next frame.  */
 300
 301 #define FRAME_INIT_SAVED_REGS(frame_info) \
 302   alpha_frame_init_saved_regs (frame_info)
 303 extern void alpha_frame_init_saved_regs (struct frame_info *);
 304 \f
 305
 306 /* Things needed for making the inferior call functions.  */
 307
 308 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 309   (alpha_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
 310 extern CORE_ADDR
 311 alpha_push_arguments (int, struct value **, CORE_ADDR, int, CORE_ADDR);
 312
 313 /* Push an empty stack frame, to record the current PC, etc.  */
 314
 315 #define PUSH_DUMMY_FRAME        alpha_push_dummy_frame()
 316 extern void alpha_push_dummy_frame (void);
 317
 318 /* Discard from the stack the innermost frame, restoring all registers.  */
 319
 320 #define POP_FRAME               alpha_pop_frame()
 321 extern void alpha_pop_frame (void);
 322
 323 /* Alpha OSF/1 inhibits execution of code on the stack.
 324    But there is no need for a dummy on the alpha. PUSH_ARGUMENTS
 325    takes care of all argument handling and bp_call_dummy takes care
 326    of stopping the dummy.  */
 327
 328 #define CALL_DUMMY_LOCATION AT_ENTRY_POINT
 329
 330 /* On the Alpha the call dummy code is never copied to user space,
 331    stopping the user call is achieved via a bp_call_dummy breakpoint.
 332    But we need a fake CALL_DUMMY definition to enable the proper
 333    call_function_by_hand and to avoid zero length array warnings
 334    in valops.c  */
 335
 336 #define CALL_DUMMY { 0 }        /* Content doesn't matter. */
 337
 338 #define CALL_DUMMY_START_OFFSET (0)
 339
 340 #define CALL_DUMMY_BREAKPOINT_OFFSET (0)
 341
 342 extern CORE_ADDR alpha_call_dummy_address (void);
 343 #define CALL_DUMMY_ADDRESS() alpha_call_dummy_address()
 344
 345 /* Insert the specified number of args and function address
 346    into a call sequence of the above form stored at DUMMYNAME.
 347    We only have to set RA_REGNUM to the dummy breakpoint address
 348    and T12_REGNUM (the `procedure value register') to the function address.  */
 349
 350 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
 351   alpha_fix_call_dummy ((dummyname), (pc), (fun), (nargs), (args), \
 352                         (type), (gcc_p))
 353 extern void alpha_fix_call_dummy (char *, CORE_ADDR, CORE_ADDR, int,
 354                                   struct value **, struct type *, int);
 355
 356 /* There's a mess in stack frame creation.  See comments in blockframe.c
 357    near reference to INIT_FRAME_PC_FIRST.  */
 358
 359 #define INIT_FRAME_PC(fromleaf, prev) init_frame_pc_noop ((fromleaf), (prev))
 360
 361 #define INIT_FRAME_PC_FIRST(fromleaf, prev) \
 362   alpha_init_frame_pc_first ((fromleaf), (prev))
 363 extern void alpha_init_frame_pc_first (int, struct frame_info *);
 364
 365 /* Special symbol found in blocks associated with routines.  We can hang
 366    alpha_extra_func_info_t's off of this.  */
 367
 368 #define MIPS_EFI_SYMBOL_NAME "__GDB_EFI_INFO__"
 369 extern void ecoff_relocate_efi (struct symbol *, CORE_ADDR);
 370
 371 /* Specific information about a procedure.
 372    This overlays the ALPHA's PDR records,
 373    alpharead.c (ab)uses this to save memory */
 374
 375 typedef struct alpha_extra_func_info
 376   {
 377     long numargs;               /* number of args to procedure (was iopt) */
 378     PDR pdr;                    /* Procedure descriptor record */
 379   }
 380  *alpha_extra_func_info_t;
 381
 382 /* Define the extra_func_info that mipsread.c needs.
 383    FIXME: We should define our own PDR interface, perhaps in a separate
 384    header file. This would get rid of the <bfd.h> inclusion in all sources
 385    and would abstract the mips/alpha interface from ecoff.  */
 386 #define mips_extra_func_info alpha_extra_func_info
 387 #define mips_extra_func_info_t alpha_extra_func_info_t
 388
 389
 390 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
 391   alpha_init_extra_frame_info(fromleaf, fci)
 392 extern void alpha_init_extra_frame_info (int, struct frame_info *);
 393
 394 #define PRINT_EXTRA_FRAME_INFO(fi) alpha_print_extra_frame_info ((fi))
 395 extern void alpha_print_extra_frame_info (struct frame_info *);
 396
 397
 398 /* It takes two values to specify a frame on the ALPHA.  Sigh.
 399
 400    In fact, at the moment, the *PC* is the primary value that sets up
 401    a frame.  The PC is looked up to see what function it's in; symbol
 402    information from that function tells us which register is the frame
 403    pointer base, and what offset from there is the "virtual frame pointer".
 404    (This is usually an offset from SP.)  FIXME -- this should be cleaned
 405    up so that the primary value is the SP, and the PC is used to disambiguate
 406    multiple functions with the same SP that are at different stack levels. */
 407
 408 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
 409 extern struct frame_info *setup_arbitrary_frame (int, CORE_ADDR *);
 410
 411 /* This is used by heuristic_proc_start.  It should be shot it the head.  */
 412 #ifndef VM_MIN_ADDRESS
 413 #define VM_MIN_ADDRESS (CORE_ADDR)0x120000000
 414 #endif
 415
 416 /* If PC is in a shared library trampoline code, return the PC
 417    where the function itself actually starts.  If not, return 0.  */
 418 #define SKIP_TRAMPOLINE_CODE(pc)  find_solib_trampoline_target (pc)
 419
 420 /* If the current gcc for for this target does not produce correct debugging
 421    information for float parameters, both prototyped and unprototyped, then
 422    define this macro.  This forces gdb to  always assume that floats are
 423    passed as doubles and then converted in the callee.
 424
 425    For the alpha, it appears that the debug info marks the parameters as
 426    floats regardless of whether the function is prototyped, but the actual
 427    values are always passed in as doubles.  Thus by setting this to 1, both
 428    types of calls will work. */
 429
 430 #define COERCE_FLOAT_TO_DOUBLE(formal, actual) (1)
 431
 432 /* Return TRUE if procedure descriptor PROC is a procedure descriptor
 433    that refers to a dynamically generated sigtramp function.
 434
 435    OSF/1 doesn't use dynamic sigtramp functions, so this is always
 436    FALSE.  */
 437
 438 #define PROC_DESC_IS_DYN_SIGTRAMP(proc) (0)
 439 #define SET_PROC_DESC_IS_DYN_SIGTRAMP(proc)
 440
 441 /* If PC is inside a dynamically generated sigtramp function, return
 442    how many bytes the program counter is beyond the start of that
 443    function.  Otherwise, return a negative value.
 444
 445    OSF/1 doesn't use dynamic sigtramp functions, so this always
 446    returns -1.  */
 447
 448 #define DYNAMIC_SIGTRAMP_OFFSET(pc)     (-1)
 449
 450 /* Translate a signal handler frame into the address of the sigcontext
 451    structure.  */
 452
 453 #define SIGCONTEXT_ADDR(frame) \
 454   (read_memory_integer ((frame)->next ? frame->next->frame : frame->frame, 8))
 455
 456 /* If FRAME refers to a sigtramp frame, return the address of the next
 457    frame.  */
 458
 459 #define FRAME_PAST_SIGTRAMP_FRAME(frame, pc) \
 460   (alpha_osf_skip_sigtramp_frame (frame, pc))
 461 extern CORE_ADDR alpha_osf_skip_sigtramp_frame (struct frame_info *,
 462                                                 CORE_ADDR);
 463
 464 /* Single step based on where the current instruction will take us.  */
 465 extern void alpha_software_single_step (enum target_signal, int);
 466
 467 #endif /* TM_ALPHA_H */