Sprite 1984 - 1993/Sprite 1984 - 1993.iso/src/cmds/gdb-4.5/dist/gdb/tm-isi.h

C/C++ Source or Header | 1991-11-19 | 6.6 KB | 162 lines

/* Definitions to target GDB on an ISI Optimum V (3.05) under 4.3bsd.
   Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* This has not been tested on ISI's running BSD 4.2, but it will probably
   work.  */

#define HAVE_68881

/* Define this if the C compiler puts an underscore at the front
   of external names before giving them to the linker.  */

#define NAMES_HAVE_UNDERSCORE

/* Address of end of stack space.  */

#define STACK_END_ADDR 0xfffe000

/* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */

#define DATAROUND    0x20000
#define N_DATADDR(hdr)    (hdr.a_magic != OMAGIC ? \
    (hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text)

/* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */

#define N_TXTADDR(hdr)    (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0)

/* Amount PC must be decremented by after a breakpoint.
   This is often the number of bytes in BREAKPOINT
   but not always.
   On the ISI, the kernel resets the pc to the trap instr */

#define DECR_PC_AFTER_BREAK 0


/* Return number of args passed to a frame.
   Can return -1, meaning no way to tell.  */

#define FRAME_NUM_ARGS(val, fi)  \
{ register CORE_ADDR pc = FRAME_SAVED_PC (fi);            \
  register int insn = 0177777 & read_memory_integer (pc, 2);    \
  val = 0;                            \
  if (insn == 0047757 || insn == 0157374)  /* lea W(sp),sp or addaw #W,sp */ \
    val = read_memory_integer (pc + 2, 2);            \
  else if ((insn & 0170777) == 0050217 /* addql #N, sp */    \
       || (insn & 0170777) == 0050117)  /* addqw */        \
    { val = (insn >> 9) & 7; if (val == 0) val = 8; }        \
  else if (insn == 0157774) /* addal #WW, sp */            \
    val = read_memory_integer (pc + 2, 4);            \
  val >>= 2; }

/* Put here the code to store, into a struct frame_saved_regs,
   the addresses of the saved registers of frame described by FRAME_INFO.
   This includes special registers such as pc and fp saved in special
   ways in the stack frame.  sp is even more special:
   the address we return for it IS the sp for the next frame.  */

#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)        \
{ register int regnum;                            \
  register int regmask;                            \
  register CORE_ADDR next_addr;                        \
  register CORE_ADDR pc;                        \
  register int insn;                            \
  register int offset;                            \
  bzero (&frame_saved_regs, sizeof frame_saved_regs);            \
  if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
      && (frame_info)->pc <= (frame_info)->frame)                \
    { next_addr = (frame_info)->frame;                    \
      pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
  else                                   \
    { pc = get_pc_function_start ((frame_info)->pc);             \
      /* Verify we have a link a6 instruction next,            \
     or a branch followed by a link a6 instruction;            \
     if not we lose.  If we win, find the address above the saved   \
     regs using the amount of storage from the link instruction.  */\
retry:                                    \
      insn = read_memory_integer (pc, 2);                \
      if (insn == 044016)                        \
    next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 4), pc+=4; \
      else if (insn == 047126)                        \
    next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 2), pc+=2; \
      else if ((insn & 0177400) == 060000)    /* bra insn */        \
    { offset = insn & 0377;                        \
          pc += 2;                /* advance past bra */    \
      if (offset == 0)            /* bra #word */        \
        offset = read_memory_integer (pc, 2), pc += 2;        \
      else if (offset == 0377)        /* bra #long */        \
        offset = read_memory_integer (pc, 4), pc += 4;        \
      pc += offset;                            \
      goto retry;                            \
      } else goto lose;                            \
      /* If have an addal #-n, sp next, adjust next_addr.  */        \
      if ((0177777 & read_memory_integer (pc, 2)) == 0157774)        \
    next_addr += read_memory_integer (pc += 2, 4), pc += 4;        \
    }                                    \
  /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */    \
  insn = read_memory_integer (pc, 2), pc += 2;                \
  regmask = read_memory_integer (pc, 2);                \
  if ((insn & 0177760) == 022700)    /* movl rn, (sp) */        \
    (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr;    \
  else if ((insn & 0177760) == 024700)    /* movl rn, -(sp) */        \
    (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \
  else if (insn == 0044327)        /* moveml mask, (sp) */        \
    { pc += 2;                                \
      /* Regmask's low bit is for register 0, the first written */    \
      next_addr -= 4;                            \
      for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)        \
    if (regmask & 1)                        \
          (frame_saved_regs).regs[regnum] = (next_addr += 4);        \
  } else if (insn == 0044347)        /* moveml mask, -(sp) */    \
    { pc += 2;                                \
      /* Regmask's low bit is for register 15, the first pushed */    \
      for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)        \
    if (regmask & 1)                        \
          (frame_saved_regs).regs[regnum] = (next_addr -= 4); }        \
  /* clrw -(sp); movw ccr,-(sp) may follow.  */                \
  if (read_memory_integer (pc, 2) == 041147                 \
      && read_memory_integer (pc+2, 2) == 042347)            \
    (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4);        \
  lose: ;                                \
  (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8;        \
  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;        \
  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;        \
}

/* The only reason this is here is the tm-isi.h reference below.  It
   was moved back here from tm-68k.h.  FIXME? */

#define SKIP_PROLOGUE(pc)   \
{ register int op = read_memory_integer (pc, 2);    \
  if (op == 0047126)                    \
    pc += 4;   /* Skip link #word */            \
  else if (op == 0044016)                \
    pc += 6;   /* Skip link #long */            \
  /* Not sure why branches are here.  */        \
  /* From tm-isi.h, tm-altos.h */            \
  else if (op == 0060000)                \
    pc += 4;   /* Skip bra #word */            \
  else if (op == 00600377)                \
    pc += 6;   /* skip bra #long */            \
  else if ((op & 0177400) == 0060000)            \
    pc += 2;   /* skip bra #char */            \
}

#include "tm-68k.h"