gdb/tm-news.h

   1 /* Parameters for execution on a Sony/NEWS, for GDB, the GNU debugger.
   2    Copyright 1987, 1989, 1991, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* See following cpu type determination macro to get the machine type.
  21
  22 Here is an m-news.h file for gdb.  It supports the 68881 registers.
  23                                            by hikichi@srava.sra.junet
  24
  25 * Support Sun assembly format instead of Motorola one.
  26 * Ptrace for handling floating register has a bug(before NEWS OS version 2.2),
  27 * After NEWS OS version 3.2, some of ptrace's bug is fixed.
  28   But we cannot change the floating register(see adb(1) in OS 3.2) yet.  */
  29
  30 #define HAVE_68881
  31
  32 /* Use to compute STACK_END_ADDR.  */
  33 #define TARGET_UPAGES 2
  34 #define TARGET_NBPG 4096
  35
  36 /* Address of end of stack space.  */
  37
  38 #define STACK_END_ADDR (0x80000000 - TARGET_UPAGES * TARGET_NBPG)
  39
  40 /* Extract from an array REGBUF containing the (raw) register state
  41    a function return value of type TYPE, and copy that, in virtual format,
  42    into VALBUF.  */
  43
  44 /* when it return the floating value, use the FP0 in NEWS.  */
  45 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
  46   { if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
  47       { \
  48         REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM, \
  49                                &REGBUF[REGISTER_BYTE (FP0_REGNUM)], VALBUF); \
  50       } \
  51     else \
  52       bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)); }
  53
  54 /* Write into appropriate registers a function return value
  55    of type TYPE, given in virtual format.  */
  56
  57 /* when it return the floating value, use the FP0 in NEWS.  */
  58 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
  59   { if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
  60       { \
  61         char raw_buf[REGISTER_RAW_SIZE (FP0_REGNUM)]; \
  62         REGISTER_CONVERT_TO_RAW (FP0_REGNUM, VALBUF, raw_buf); \
  63         write_register_bytes (FP0_REGNUM, \
  64                               raw_buf, REGISTER_RAW_SIZE (FP0_REGNUM)); \
  65       } \
  66     else \
  67       write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)); }
  68
  69 /* Return number of args passed to a frame.
  70    Can return -1, meaning no way to tell.  */
  71
  72 #define FRAME_NUM_ARGS(val, fi)  \
  73 { register CORE_ADDR pc = FRAME_SAVED_PC (fi);                  \
  74   register int insn = 0177777 & read_memory_integer (pc, 2);    \
  75   val = 0;                                                      \
  76   if (insn == 0047757 || insn == 0157374)  /* lea W(sp),sp or addaw #W,sp */ \
  77     val = read_memory_integer (pc + 2, 2);                      \
  78   else if ((insn & 0170777) == 0050217 /* addql #N, sp */       \
  79            || (insn & 0170777) == 0050117)  /* addqw */         \
  80     { val = (insn >> 9) & 7; if (val == 0) val = 8; }           \
  81   else if (insn == 0157774) /* addal #WW, sp */                 \
  82     val = read_memory_integer (pc + 2, 4);                      \
  83   val >>= 2; }
  84
  85 #include "tm-68k.h"