gdb/config/m68k/xm-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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #define HOST_BYTE_ORDER BIG_ENDIAN
  21
  22 /* The altos support would make a good base for a port to other USGR2 systems
  23    (like the 3b1 and the Convergent miniframe).  */
  24
  25 /* This is only needed in one file, but it's cleaner to put it here than
  26    putting in more #ifdef's.  */
  27 #include <sys/page.h>
  28 #include <sys/net.h>
  29
  30 #define USG
  31
  32 #define HAVE_TERMIO
  33
  34 #define CBREAK XTABS    /* It takes all kinds... */
  35
  36 #ifndef R_OK
  37 #define R_OK 4
  38 #define W_OK 2
  39 #define X_OK 1
  40 #define F_OK 0
  41 #endif
  42
  43 /* Get sys/wait.h ie. from a Sun and edit it a little (mc68000 to m68k) */
  44 /* Why bother?  */
  45 #if 0
  46 #define HAVE_WAIT_STRUCT
  47 #endif
  48
  49 /* This is the amount to subtract from u.u_ar0
  50    to get the offset in the core file of the register values. */
  51
  52 #define KERNEL_U_ADDR 0x1fbf000
  53
  54 #define REGISTER_U_ADDR(addr, blockend, regno)          \
  55 {       if (regno <= SP_REGNUM) \
  56           addr = blockend + regno * 4; \
  57         else if (regno == PS_REGNUM) \
  58           addr = blockend + regno * 4 + 4; \
  59         else if (regno == PC_REGNUM) \
  60           addr = blockend + regno * 4 + 2; \
  61 }
  62
  63 #define REGISTER_ADDR(u_ar0, regno)                                     \
  64   (((regno) < PS_REGNUM)                                                \
  65    ? (&((struct exception_stack *) (u_ar0))->e_regs[(regno + R0)])      \
  66    : (((regno) == PS_REGNUM)                                            \
  67       ? ((int *) (&((struct exception_stack *) (u_ar0))->e_PS))         \
  68       : (&((struct exception_stack *) (u_ar0))->e_PC)))
  69
  70 #define FP_REGISTER_ADDR(u, regno)                                      \
  71   (((char *)                                                            \
  72     (((regno) < FPC_REGNUM)                                             \
  73      ? (&u.u_pcb.pcb_mc68881[FMC68881_R0 + (((regno) - FP0_REGNUM) * 3)]) \
  74      : (&u.u_pcb.pcb_mc68881[FMC68881_C + ((regno) - FPC_REGNUM)])))    \
  75    - ((char *) (& u)))
  76
  77 \f
  78 #ifndef __GNUC__
  79 #undef USE_GAS
  80 #define ALTOS_AS
  81 #else
  82 #define USE_GAS
  83 #endif
  84
  85 /* Motorola assembly format */
  86 #if !defined(USE_GAS) && !defined(ALTOS)
  87 #define MOTOROLA
  88 #endif
  89
  90 /* Interface definitions for kernel debugger KDB.  */
  91
  92 /* Map machine fault codes into signal numbers.
  93    First subtract 0, divide by 4, then index in a table.
  94    Faults for which the entry in this table is 0
  95    are not handled by KDB; the program's own trap handler
  96    gets to handle then.  */
  97
  98 #define FAULT_CODE_ORIGIN 0
  99 #define FAULT_CODE_UNITS 4
 100 #define FAULT_TABLE    \
 101 { 0, 0, 0, 0, SIGTRAP, 0, 0, 0, \
 102   0, SIGTRAP, 0, 0, 0, 0, 0, SIGKILL, \
 103   0, 0, 0, 0, 0, 0, 0, 0, \
 104   SIGILL }
 105
 106 /* Start running with a stack stretching from BEG to END.
 107    BEG and END should be symbols meaningful to the assembler.
 108    This is used only for kdb.  */
 109
 110 #ifdef MOTOROLA
 111 #define INIT_STACK(beg, end)  \
 112 { asm (".globl end");         \
 113   asm ("move.l $ end, sp");      \
 114   asm ("clr.l fp"); }
 115 #else
 116 #ifdef ALTOS_AS
 117 #define INIT_STACK(beg, end)  \
 118 { asm ("global end");         \
 119   asm ("mov.l &end,%sp");      \
 120   asm ("clr.l %fp"); }
 121 #else
 122 #define INIT_STACK(beg, end)  \
 123 { asm (".globl end");         \
 124   asm ("movel $ end, sp");      \
 125   asm ("clrl fp"); }
 126 #endif
 127 #endif
 128
 129 /* Push the frame pointer register on the stack.  */
 130 #ifdef MOTOROLA
 131 #define PUSH_FRAME_PTR        \
 132   asm ("move.l fp, -(sp)");
 133 #else
 134 #ifdef ALTOS_AS
 135 #define PUSH_FRAME_PTR        \
 136   asm ("mov.l %fp, -(%sp)");
 137 #else
 138 #define PUSH_FRAME_PTR        \
 139   asm ("movel fp, -(sp)");
 140 #endif
 141 #endif
 142
 143 /* Copy the top-of-stack to the frame pointer register.  */
 144 #ifdef MOTOROLA
 145 #define POP_FRAME_PTR  \
 146   asm ("move.l (sp), fp");
 147 #else
 148 #ifdef ALTOS_AS
 149 #define POP_FRAME_PTR  \
 150   asm ("mov.l (%sp), %fp");
 151 #else
 152 #define POP_FRAME_PTR  \
 153   asm ("movl (sp), fp");
 154 #endif
 155 #endif
 156
 157 /* After KDB is entered by a fault, push all registers
 158    that GDB thinks about (all NUM_REGS of them),
 159    so that they appear in order of ascending GDB register number.
 160    The fault code will be on the stack beyond the last register.  */
 161
 162 #ifdef MOTOROLA
 163 #define PUSH_REGISTERS        \
 164 { asm ("clr.w -(sp)");        \
 165   asm ("pea (10,sp)");        \
 166   asm ("movem $ 0xfffe,-(sp)"); }
 167 #else
 168 #ifdef ALTOS_AS
 169 #define PUSH_REGISTERS        \
 170 { asm ("clr.w -(%sp)");       \
 171   asm ("pea (10,%sp)");       \
 172   asm ("movm.l &0xfffe,-(%sp)"); }
 173 #else
 174 #define PUSH_REGISTERS        \
 175 { asm ("clrw -(sp)");         \
 176   asm ("pea 10(sp)");         \
 177   asm ("movem $ 0xfffe,-(sp)"); }
 178 #endif
 179 #endif
 180
 181 /* Assuming the registers (including processor status) have been
 182    pushed on the stack in order of ascending GDB register number,
 183    restore them and return to the address in the saved PC register.  */
 184
 185 #ifdef MOTOROLA
 186 #define POP_REGISTERS          \
 187 { asm ("subi.l $8,28(sp)");     \
 188   asm ("movem (sp),$ 0xffff"); \
 189   asm ("rte"); }
 190 #else
 191 #ifdef ALTOS_AS
 192 #define POP_REGISTERS          \
 193 { asm ("sub.l &8,28(%sp)");     \
 194   asm ("movem (%sp),&0xffff"); \
 195   asm ("rte"); }
 196 #else
 197 #define POP_REGISTERS          \
 198 { asm ("subil $8,28(sp)");     \
 199   asm ("movem (sp),$ 0xffff"); \
 200   asm ("rte"); }
 201 #endif
 202 #endif