gdb/tm-altos.h

   1 /* Definitions to make GDB run on an Altos 3068 (m68k running SVR2)
   2    Copyright (C) 1987,1989 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 /* Sequence of bytes for breakpoint instruction.  */
  21
  22 #define BREAKPOINT {0x4e, 0x4e}
  23
  24 /* Define this if the C compiler puts an underscore at the front
  25    of external names before giving them to the linker.  */
  26
  27 #undef NAMES_HAVE_UNDERSCORE
  28
  29 /* Exec files and symbol tables are in COFF format */
  30
  31 #define COFF_FORMAT
  32 #define COFF_NO_LONG_FILE_NAMES
  33
  34 /* Address of end of stack space.  */
  35
  36 /*#define STACK_END_ADDR (0xffffff)*/
  37 #define STACK_END_ADDR (0x1000000)
  38
  39 /* Amount PC must be decremented by after a breakpoint.
  40    This is often the number of bytes in BREAKPOINT
  41    but not always.
  42    On the Altos, the kernel resets the pc to the trap instr */
  43
  44 #define DECR_PC_AFTER_BREAK 0
  45
  46 \f
  47 /* Things needed for making the inferior call functions.  */
  48
  49 /* Push an empty stack frame, to record the current PC, etc.  */
  50
  51 #define PUSH_DUMMY_FRAME \
  52 { register CORE_ADDR sp = read_register (SP_REGNUM);                    \
  53   register int regnum;                                                  \
  54   char raw_buffer[12];                                                  \
  55   sp = push_word (sp, read_register (PC_REGNUM));                       \
  56   sp = push_word (sp, read_register (FP_REGNUM));                       \
  57   write_register (FP_REGNUM, sp);                                       \
  58   for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)         \
  59     { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);     \
  60       sp = push_bytes (sp, raw_buffer, 12); }                           \
  61   for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)                   \
  62     sp = push_word (sp, read_register (regnum));                        \
  63   sp = push_word (sp, read_register (PS_REGNUM));                       \
  64   write_register (SP_REGNUM, sp);  }
  65
  66 /* Discard from the stack the innermost frame,
  67    restoring all saved registers.  */
  68
  69 #define POP_FRAME  \
  70 { register FRAME frame = get_current_frame ();                          \
  71   register CORE_ADDR fp;                                                \
  72   register int regnum;                                                  \
  73   struct frame_saved_regs fsr;                                          \
  74   struct frame_info *fi;                                                \
  75   char raw_buffer[12];                                                  \
  76   fi = get_frame_info (frame);                                          \
  77   fp = fi->frame;                                                       \
  78   get_frame_saved_regs (fi, &fsr);                                      \
  79   for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)         \
  80     if (fsr.regs[regnum])                                               \
  81       { read_memory (fsr.regs[regnum], raw_buffer, 12);                 \
  82         write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
  83   for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)                   \
  84     if (fsr.regs[regnum])                                               \
  85       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
  86   if (fsr.regs[PS_REGNUM])                                              \
  87     write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
  88   write_register (FP_REGNUM, read_memory_integer (fp, 4));              \
  89   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));          \
  90   write_register (SP_REGNUM, fp + 8);                                   \
  91   flush_cached_frames ();                                               \
  92   set_current_frame (create_new_frame (read_register (FP_REGNUM),       \
  93                                         read_pc ())); }
  94
  95 /* This sequence of words is the instructions
  96      fmovem 0xff,-(sp)
  97      moveml 0xfffc,-(sp)
  98      clrw -(sp)
  99      movew ccr,-(sp)
 100      /..* The arguments are pushed at this point by GDB;
 101         no code is needed in the dummy for this.
 102         The CALL_DUMMY_START_OFFSET gives the position of
 103         the following jsr instruction.  *../
 104      jsr @#32323232
 105      addl #69696969,sp
 106      bpt
 107      nop
 108 Note this is 28 bytes.
 109 We actually start executing at the jsr, since the pushing of the
 110 registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 111 the arguments for the function called by the jsr would be pushed
 112 between the moveml and the jsr, and we could allow it to execute through.
 113 But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
 114 and we cannot allow the moveml to push the registers again lest they be
 115 taken for the arguments.  */
 116
 117 #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4e4e71}
 118
 119 #define CALL_DUMMY_LENGTH 28
 120
 121 #define CALL_DUMMY_START_OFFSET 12
 122
 123 /* Insert the specified number of args and function address
 124    into a call sequence of the above form stored at DUMMYNAME.  */
 125
 126 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)     \
 127 { *(int *)((char *) dummyname + 20) = nargs * 4;  \
 128   *(int *)((char *) dummyname + 14) = fun; }
 129 \f
 130 #include "tm-68k.h"