gdb/config/tic80/tm-tic80.h

   1 /* Parameters for execution on a TI TMS320C80 (MVP) processor.
   2    Copyright 1997
   3    Free Software Foundation, Inc.
   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 #ifndef TM_TIC80_H
  22 #define TM_TIC80_H
  23
  24 #ifdef __STDC__         /* Forward declare structs used in prototypes */
  25 struct frame_info;
  26 struct type;
  27 struct value;
  28 struct symbol;
  29 struct frame_saved_regs;
  30 #endif
  31
  32 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
  33
  34 /* Define this if the C compiler puts an underscore at the front
  35    of external names before giving them to the linker.  */
  36
  37 #define NAMES_HAVE_UNDERSCORE
  38
  39 #define NUM_REGS 38
  40
  41 #define REGISTER_NAMES \
  42 { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
  43   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
  44   "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
  45   "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
  46   "pc", "npc", \
  47   "a0", "a1", "a2", "a3", \
  48 }
  49
  50 /* Various dedicated register numbers
  51    FIXME: Shadow updates in sim/tic80/sim-calls.c */
  52
  53 #define SP_REGNUM 1             /* Contains address of top of stack */
  54 #define ARG0_REGNUM 2           /* Contains argument 1 (r3 has high word) */
  55 #define RET_REGNUM  2           /* Contains function return value */
  56 #define ARGLAST_REGNUM 12       /* Contains argument 6 (r13 has high word) */
  57 #define FP_REGNUM 30            /* Contains address of executing stack frame */
  58 #define LR_REGNUM 31            /* Contains address of caller (link register) */
  59 #define PC_REGNUM 32            /* Contains program counter (FIXME?) */
  60 #define NPC_REGNUM 33           /* Contains the next program counter (FIXME?) */
  61 #define A0_REGNUM 34            /* Accumulator register 0 */
  62 #define A3_REGNUM 37            /* Accumulator register 1 */
  63
  64 #define R0_REGNUM 0             /* General Purpose Register 0 - for sim */
  65 #define Rn_REGNUM 31            /* Last General Purpose Register - for sim */
  66 #define An_REGNUM A3_REGNUM     /* Last Accumulator register - for sim */
  67
  68 /* Total amount of space needed to store our copies of the machine's
  69    register state, the array `registers'.  */
  70
  71 #define REGISTER_BYTES (((NUM_REGS - 4) * 4) + (4 * 8))
  72
  73 /* Index within `registers' of the first byte of the space for
  74    register N.  */
  75
  76 #define REGISTER_BYTE(N) \
  77    (((N) >= A0_REGNUM) ? (((N) - A0_REGNUM) * 8 + A0_REGNUM * 4) : ((N) * 4))
  78
  79 /* Most registers are 4 bytes */
  80
  81 #define REGISTER_SIZE 4
  82
  83 /* Some registers are 8 bytes.  */
  84
  85 #define REGISTER_RAW_SIZE(N) \
  86      (((N) >= A0_REGNUM) ? 8 : 4)
  87
  88 /* Largest value REGISTER_RAW_SIZE can have.  */
  89
  90 #define MAX_REGISTER_RAW_SIZE (8)
  91
  92 /* All regs are 4 bytes.  */
  93
  94 #define REGISTER_VIRTUAL_SIZE(N) (REGISTER_RAW_SIZE(N))
  95
  96 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
  97
  98 #define MAX_REGISTER_VIRTUAL_SIZE (MAX_REGISTER_RAW_SIZE)
  99
 100 /* Return the GDB type object for the "standard" data type
 101    of data in register N.  */
 102
 103 #define REGISTER_VIRTUAL_TYPE(N) /* FIXME? */ \
 104         (((N) >= A0_REGNUM) ? builtin_type_float : builtin_type_int)
 105
 106 /* Offset from address of function to start of its code.
 107    Zero on most machines.  */
 108
 109 #define FUNCTION_START_OFFSET 0
 110
 111 /* Stack grows downward.  */
 112
 113 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
 114
 115 /* Sequence of bytes for breakpoint instruction.
 116    This is padded out to the size of a machine word. */
 117
 118 #define BREAKPOINT              {0x49, 0x80, 0x00, 0x00}        /* FIXME! */
 119
 120 /* Amount PC must be decremented by after a breakpoint.
 121    This is often the number of bytes in BREAKPOINT
 122    but not always.  */
 123
 124 #define DECR_PC_AFTER_BREAK     0                       /* FIXME! */
 125
 126 /* Discard from the stack the innermost frame, restoring all registers.  */
 127
 128 #define POP_FRAME tic80_pop_frame(get_current_frame ())
 129 extern struct frame_info *tic80_pop_frame PARAMS ((struct frame_info *frame));
 130
 131 /* Return number of bytes at start of arglist that are not really args.  */
 132
 133 #define FRAME_ARGS_SKIP 0
 134
 135 /* Set VAL to the number of args passed to frame described by FI.
 136    Can set VAL to -1, meaning no way to tell.  */
 137 /* We can't tell how many args there are */
 138
 139 #define FRAME_NUM_ARGS(fi) (-1)
 140
 141 #define FRAME_ARGS_SKIP 0
 142 #define FRAME_ARGS_ADDRESS(fi)   (fi)->frame
 143 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
 144
 145 /* Define other aspects of the stack frame.
 146    We keep the offsets of all saved registers, 'cause we need 'em a lot!
 147    We also keep the current size of the stack frame, and the offset of
 148    the frame pointer from the stack pointer (for frameless functions, and
 149    when we're still in the prologue of a function with a frame) */
 150
 151 #define EXTRA_FRAME_INFO        \
 152   struct frame_saved_regs fsr;  \
 153   int framesize;                \
 154   int frameoffset;              \
 155   int framereg;
 156
 157 extern void tic80_init_extra_frame_info PARAMS ((struct frame_info *fi));
 158 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) tic80_init_extra_frame_info (fi)
 159 #define INIT_FRAME_PC           /* Not necessary */
 160
 161 /* Put here the code to store, into a struct frame_saved_regs,
 162    the addresses of the saved registers of frame described by FRAME_INFO.
 163    This includes special registers such as pc and fp saved in special
 164    ways in the stack frame.  sp is even more special:
 165    the address we return for it IS the sp for the next frame.  */
 166
 167 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)         \
 168    tic80_frame_find_saved_regs(frame_info, &(frame_saved_regs))
 169 extern void tic80_frame_find_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *));
 170
 171 /* Advance PC across any function entry prologue instructions
 172    to reach some "real" code.  */
 173
 174 #define SKIP_PROLOGUE(pc) (tic80_skip_prologue (pc))
 175 extern CORE_ADDR tic80_skip_prologue PARAMS ((CORE_ADDR pc));
 176
 177 /* Immediately after a function call, return the saved pc.
 178    Can't always go through the frames for this because on some machines
 179    the new frame is not set up until the new function executes
 180    some instructions.  */
 181
 182 #define SAVED_PC_AFTER_CALL(frame) read_register (LR_REGNUM)
 183
 184 /* Describe the pointer in each stack frame to the previous stack frame
 185    (its caller).  */
 186
 187 /* FRAME_CHAIN takes a frame's nominal address
 188    and produces the frame's chain-pointer. */
 189
 190 #define FRAME_CHAIN(thisframe) (CORE_ADDR) tic80_frame_chain (thisframe)
 191 extern CORE_ADDR tic80_frame_chain PARAMS ((struct frame_info *));
 192
 193 #define FRAME_SAVED_PC(FRAME)   tic80_frame_saved_pc (FRAME)
 194 extern CORE_ADDR tic80_frame_saved_pc PARAMS ((struct frame_info *));
 195
 196 /* Store the address of the place in which to copy the structure the
 197    subroutine will return.  This is called from call_function.
 198
 199    We store structs through a pointer passed in R2 */
 200
 201 #define STORE_STRUCT_RETURN(STRUCT_ADDR, SP)    \
 202         write_register (ARG0_REGNUM, STRUCT_ADDR)
 203
 204 /* Extract from an array REGBUF containing the (raw) register state
 205    a function return value of type TYPE, and copy that, in virtual format,
 206    into VALBUF.  */
 207
 208 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 209   memcpy ((VALBUF), \
 210           (char *)(REGBUF) + REGISTER_BYTE (RET_REGNUM) + \
 211           ((TYPE_LENGTH (TYPE) > 4 ? 8 : 4) - TYPE_LENGTH (TYPE)), \
 212           TYPE_LENGTH (TYPE))
 213
 214 /* Write into appropriate registers a function return value
 215    of type TYPE, given in virtual format.  */
 216
 217 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 218   write_register_bytes(REGISTER_BYTE (RET_REGNUM) + \
 219                        ((TYPE_LENGTH (TYPE) > 4 ? 8:4) - TYPE_LENGTH (TYPE)),\
 220                        (VALBUF), TYPE_LENGTH (TYPE));
 221
 222
 223
 224 /* PUSH_ARGUMENTS */
 225 extern CORE_ADDR tic80_push_arguments PARAMS ((int nargs,
 226                                                struct value **args,
 227                                                CORE_ADDR sp,
 228                                                unsigned char struct_return,
 229                                                CORE_ADDR struct_addr));
 230
 231 #define PUSH_ARGUMENTS(NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) \
 232   (tic80_push_arguments (NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR))
 233
 234 /* PUSH_RETURN_ADDRESS */
 235 extern CORE_ADDR tic80_push_return_address PARAMS ((CORE_ADDR, CORE_ADDR));
 236 #define PUSH_RETURN_ADDRESS(PC, SP)     tic80_push_return_address (PC, SP)
 237
 238 /* override the standard get_saved_register function with
 239    one that takes account of generic CALL_DUMMY frames */
 240 #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
 241       generic_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
 242
 243 #define USE_GENERIC_DUMMY_FRAMES 1
 244 #define CALL_DUMMY                   {0}
 245 #define CALL_DUMMY_LENGTH            (0)
 246 #define CALL_DUMMY_START_OFFSET      (0)
 247 #define CALL_DUMMY_BREAKPOINT_OFFSET (0)
 248 #define FIX_CALL_DUMMY(DUMMY1, STARTADDR, FUNADDR, NARGS, ARGS, TYPE, GCCP)
 249 #define CALL_DUMMY_LOCATION          AT_ENTRY_POINT
 250 #define CALL_DUMMY_ADDRESS()         entry_point_address ()
 251
 252 /* generic dummy frame stuff */
 253
 254 #define PUSH_DUMMY_FRAME             generic_push_dummy_frame ()
 255 #define PC_IN_CALL_DUMMY(PC, SP, FP) generic_pc_in_call_dummy (PC, SP, FP)
 256
 257 #endif  /* TM_TIC80_H */