Sprite 1984 - 1993/Sprite 1984 - 1993.iso/src/cmds/gdb/foo/m-altos.h

C/C++ Source or Header | 1989-09-09 | 28.9 KB | 802 lines

/* Definitions to make GDB run on an Altos 3068 (m68k running SVR2)
   Copyright (C) 1987,1989 Free Software Foundation, Inc.

This file is part of GDB.

GDB 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 1, or (at your option)
any later version.

GDB 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 GDB; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* The altos support would make a good base for a port to other USGR2 systems
   (like the 3b1 and the Convergent miniframe).  */

/* This is only needed in one file, but it's cleaner to put it here than
   putting in more #ifdef's.  */
#include <sys/page.h>
#include <sys/net.h>

#ifndef ALTOS
#define ALTOS
#endif

#define USG

/* Define the bit, byte, and word ordering of the machine.  */
#define BITS_BIG_ENDIAN
#define BYTES_BIG_ENDIAN
#define WORDS_BIG_ENDIAN

/* Get rid of any system-imposed stack limit if possible.  */

/*#define SET_STACK_LIMIT_HUGE*/

#define HAVE_TERMIO

#define CBREAK XTABS    /* It takes all kinds... */

/*
 * #define FLOATING_POINT if you have 68881
 * This hasn't been tested
 */

/*#define FLOATING_POINT*/
/*#undef FLOATING_POINT*/

#ifndef __GNUC__
#undef USE_GAS
#define ALTOS_AS
#else
#define USE_GAS
#endif

#ifndef R_OK
#define R_OK 4
#define W_OK 2
#define X_OK 1
#define F_OK 0
#endif

#ifndef MAXPATHLEN
#define MAXPATHLEN (1024)
#endif

/* Motorola assembly format */
#if !defined(USE_GAS) && !defined(ALTOS)
#define MOTOROLA
#endif

/* Get sys/wait.h ie. from a Sun and edit it a little (mc68000 to m68k) */
#define HAVE_WAIT_STRUCT

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

#undef NAMES_HAVE_UNDERSCORE

/* Exec files and symbol tables are in COFF format */

#define COFF_FORMAT
#define COFF_NO_LONG_FILE_NAMES
#define vfork fork

/* Offset from address of function to start of its code.
   Zero on most machines.  */

#define FUNCTION_START_OFFSET 0

/* Advance PC across any function entry prologue instructions
   to reach some "real" code.  */

#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 */            \
  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 */            \
}

/* Immediately after a function call, return the saved pc.
   Can't always go through the frames for this because on some machines
   the new frame is not set up until the new function executes
   some instructions.  */

#define SAVED_PC_AFTER_CALL(frame) \
read_memory_integer (read_register (SP_REGNUM), 4)

/* This is the amount to subtract from u.u_ar0
   to get the offset in the core file of the register values. */

#define KERNEL_U_ADDR 0x1fbf000

/* Address of end of stack space.  */

/*#define STACK_END_ADDR (0xffffff)*/
#define STACK_END_ADDR (0x1000000)

/* Stack grows downward.  */

#define INNER_THAN <

/* Sequence of bytes for breakpoint instruction.  */

#define BREAKPOINT {0x4e, 0x4e}

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

#define DECR_PC_AFTER_BREAK 0

/* Nonzero if instruction at PC is a return instruction.  */

#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 2) == 0x4e75)

/* Return 1 if P points to an invalid floating point value.  */

#define INVALID_FLOAT(p, len) (*((int *) (p)) == -1) /* Just a first guess; not checked */

/* Largest integer type */
#define LONGEST long

/* Name of the builtin type for the LONGEST type above. */
#define BUILTIN_TYPE_LONGEST builtin_type_long

/* Say how long (ordinary) registers are.  */

#define REGISTER_TYPE long

/* Number of machine registers */

#ifdef FLOATING_POINT
#define NUM_REGS 31
#else
#define NUM_REGS 18
#endif

/* Initializer for an array of names of registers.
   There should be NUM_REGS strings in this initializer.  */

#ifdef FLOATING_POINT
#define REGISTER_NAMES  \
 {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
  "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
  "ps", "pc",  \
  "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
  "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" \
 }
#else
#define REGISTER_NAMES  \
 {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
  "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
  "ps", "pc",  \
 }
#endif

/* Register numbers of various important registers.
   Note that some of these values are "real" register numbers,
   and correspond to the general registers of the machine,
   and some are "phony" register numbers which are too large
   to be actual register numbers as far as the user is concerned
   but do serve to get the desired values when passed to read_register.  */

#define FP_REGNUM 14        /* Contains address of executing stack frame */
#define SP_REGNUM 15        /* Contains address of top of stack */
#define PS_REGNUM 16        /* Contains processor status */
#define PC_REGNUM 17        /* Contains program counter */
#define FP0_REGNUM 18        /* Floating point register 0 */
#define FPC_REGNUM 26        /* 68881 control register */

/* Total amount of space needed to store our copies of the machine's
   register state, the array `registers'.  */
#define REGISTER_BYTES (16*4+8*12+8+20)

/* Index within `registers' of the first byte of the space for
   register N.  */

#define REGISTER_BYTE(N)  \
 ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168    \
  : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72    \
  : (N) * 4)

/* Number of bytes of storage in the actual machine representation
   for register N.  On the 68000, all regs are 4 bytes
   except the floating point regs which are 12 bytes.  */
/* Note that the unsigned cast here forces the result of the
   subtractiion to very high positive values if N < FP0_REGNUM */

#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)

/* Number of bytes of storage in the program's representation
   for register N.  On the 68000, all regs are 4 bytes
   except the floating point regs which are 8-byte doubles.  */

#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)

#define REGISTER_U_ADDR(addr, blockend, regno)        \
{    if (regno <= SP_REGNUM) \
      addr = blockend + regno * 4; \
    else if (regno == PS_REGNUM) \
      addr = blockend + regno * 4 + 4; \
    else if (regno == PC_REGNUM) \
      addr = blockend + regno * 4 + 2; \
}

/* Largest value REGISTER_RAW_SIZE can have.  */

#define MAX_REGISTER_RAW_SIZE 12

/* Largest value REGISTER_VIRTUAL_SIZE can have.  */

#define MAX_REGISTER_VIRTUAL_SIZE 8

/* Nonzero if register N requires conversion
   from raw format to virtual format.  */

#define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)

/* Convert data from raw format for register REGNUM
   to virtual format for register REGNUM.  */

#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)    \
{ if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)    \
    convert_from_68881 ((FROM), (TO));    \
  else                    \
    bcopy ((FROM), (TO), 4); }

/* Convert data from virtual format for register REGNUM
   to raw format for register REGNUM.  */

#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)    \
{ if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM)    \
    convert_to_68881 ((FROM), (TO));    \
  else                    \
    bcopy ((FROM), (TO), 4); }

/* Return the GDB type object for the "standard" data type
   of data in register N.  */

#define REGISTER_VIRTUAL_TYPE(N) \
 (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : builtin_type_int)

/* Store the address of the place in which to copy the structure the
   subroutine will return.  This is called from call_function. */

#define STORE_STRUCT_RETURN(ADDR, SP) \
  { write_register (9, (ADDR)); }

/* Extract from an array REGBUF containing the (raw) register state
   a function return value of type TYPE, and copy that, in virtual format,
   into VALBUF.  */

#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
  bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))

/* Write into appropriate registers a function return value
   of type TYPE, given in virtual format.  */

#define STORE_RETURN_VALUE(TYPE,VALBUF) \
  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))

/* Extract from an array REGBUF containing the (raw) register state
   the address in which a function should return its structure value,
   as a CORE_ADDR (or an expression that can be used as one).  */

#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))

#define REGISTER_ADDR(u_ar0, regno)                    \
  (((regno) < PS_REGNUM)                        \
   ? (&((struct exception_stack *) (u_ar0))->e_regs[(regno + R0)])    \
   : (((regno) == PS_REGNUM)                        \
      ? ((int *) (&((struct exception_stack *) (u_ar0))->e_PS))        \
      : (&((struct exception_stack *) (u_ar0))->e_PC)))

#define FP_REGISTER_ADDR(u, regno)                    \
  (((char *)                                \
    (((regno) < FPC_REGNUM)                        \
     ? (&u.u_pcb.pcb_mc68881[FMC68881_R0 + (((regno) - FP0_REGNUM) * 3)]) \
     : (&u.u_pcb.pcb_mc68881[FMC68881_C + ((regno) - FPC_REGNUM)])))    \
   - ((char *) (& u)))

/* Describe the pointer in each stack frame to the previous stack frame
   (its caller).  */

/* FRAME_CHAIN takes a frame's nominal address
   and produces the frame's chain-pointer.

   FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
   and produces the nominal address of the caller frame.

   However, if FRAME_CHAIN_VALID returns zero,
   it means the given frame is the outermost one and has no caller.
   In that case, FRAME_CHAIN_COMBINE is not used.  */

/* In the case of the Altos, the frame's nominal address
   is the address of a 4-byte word containing the calling frame's address.  */

#define FRAME_CHAIN(thisframe)  \
  (outside_startup_file ((thisframe)->pc) ?    \
   read_memory_integer ((thisframe)->frame, 4) :\
   0)

#define FRAME_CHAIN_VALID(chain, thisframe) \
  (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))

#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)

/* Define other aspects of the stack frame.  */

/* A macro that tells us whether the function invocation represented
   by FI does not have a frame on the stack associated with it.  If it
   does not, FRAMELESS is set to 1, else 0.  */
#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
  FRAMELESS_LOOK_FOR_PROLOGUE(FI, FRAMELESS)

#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))

#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)

#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)

/* Set VAL to the number of args passed to frame described by FI.
   Can set VAL to -1, meaning no way to tell.  */

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

/* We can't tell how many args there are
   now that the (gnu) C compiler delays popping them.
   Perhaps we could tell if we use the Altos cc, but I'm not sure
   COFF_FORMAT is the right conditional  */

#ifdef COFF_FORMAT

#define FRAME_NUM_ARGS(val, fi) (val = -1)
#if 0
#define FRAME_NUM_ARGS(val, fi)  \
{ register CORE_ADDR pc = FRAME_SAVED_PC (fi.frame);        \
  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; }
#endif

/* Return number of bytes at start of arglist that are not really args.  */

#define FRAME_ARGS_SKIP 8

/* 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;                        \
  int nextinsn;                                \
  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;            \
     if not we lose.  If we win, find the address above the saved   \
     regs using the amount of storage from the link instruction.  */\
      if (044016 == read_memory_integer (pc, 2))            \
    next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
      else if (047126 == read_memory_integer (pc, 2))            \
    next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
      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) */    \
  regmask = read_memory_integer (pc + 2, 2);                \
  /* But before that can come an fmovem.  Check for it.  */        \
  nextinsn = 0xffff & read_memory_integer (pc, 2);            \
  if (0xf227 == nextinsn                        \
      && (regmask & 0xff00) == 0xe000)                    \
    { pc += 4; /* Regmask's low bit is for register fp7, the first pushed */ \
      for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)        \
    if (regmask & 1)                        \
          (frame_saved_regs).regs[regnum] = (next_addr -= 12);        \
      regmask = read_memory_integer (pc + 2, 2); }            \
  if (0044327 == read_memory_integer (pc, 2))                \
    { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
      for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)        \
    if (regmask & 1)                        \
          (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; }    \
  else if (0044347 == read_memory_integer (pc, 2))            \
    { pc += 4; /* 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); }        \
  else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2)))        \
    { regnum = 0xf & read_memory_integer (pc, 2); pc += 2;        \
      (frame_saved_regs).regs[regnum] = (next_addr -= 4); }        \
  /* fmovemx to index of sp may follow.  */                \
  regmask = read_memory_integer (pc + 2, 2);                \
  nextinsn = 0xffff & read_memory_integer (pc, 2);            \
  if (0xf236 == nextinsn                        \
      && (regmask & 0xff00) == 0xf000)                    \
    { pc += 10; /* Regmask's low bit is for register fp0, the first written */ \
      for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)        \
    if (regmask & 1)                        \
          (frame_saved_regs).regs[regnum] = (next_addr += 12) - 12;    \
      regmask = read_memory_integer (pc + 2, 2); }            \
  /* clrw -(sp); movw ccr,-(sp) may follow.  */                \
  if (0x426742e7 == read_memory_integer (pc, 4))            \
    (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;        \
}

#if 0
{ register int regnum;                            \
  register int regmask;                            \
  register CORE_ADDR next_addr;                        \
  register CORE_ADDR pc;                        \
  int nextinsn;                                \
  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;            \
     if not we lose.  If we win, find the address above the saved   \
     regs using the amount of storage from the link instruction.  */\
      if (044016 == read_memory_integer (pc, 2))            \
    next_addr = (frame_info).frame + read_memory_integer (pc += 2, 4), pc+=4; \
      else if (047126 == read_memory_integer (pc, 2))            \
    next_addr = (frame_info).frame + read_memory_integer (pc += 2, 2), pc+=2; \
      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) */    \
  regmask = read_memory_integer (pc + 2, 2);                \
  /* But before that can come an fmovem.  Check for it.  */        \
  nextinsn = 0xffff & read_memory_integer (pc, 2);            \
  if (0xf227 == nextinsn                        \
      && (regmask & 0xff00) == 0xe000)                    \
    { pc += 4; /* Regmask's low bit is for register fp7, the first pushed */ \
      for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)        \
    if (regmask & 1)                        \
          (frame_saved_regs).regs[regnum] = (next_addr -= 12);        \
      regmask = read_memory_integer (pc + 2, 2); }            \
  if (0044327 == read_memory_integer (pc, 2))                \
    { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
      for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)        \
    if (regmask & 1)                        \
          (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; }    \
  else if (0044347 == read_memory_integer (pc, 2))            \
    { pc += 4; /* 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); }        \
  else if (0x2f00 == 0xfff0 & read_memory_integer (pc, 2))        \
    { regnum = 0xf & read_memory_integer (pc, 2); pc += 2;        \
      (frame_saved_regs).regs[regnum] = (next_addr -= 4); }        \
  /* fmovemx to index of sp may follow.  */                \
  regmask = read_memory_integer (pc + 2, 2);                \
  nextinsn = 0xffff & read_memory_integer (pc, 2);            \
  if (0xf236 == nextinsn                        \
      && (regmask & 0xff00) == 0xf000)                    \
    { pc += 10; /* Regmask's low bit is for register fp0, the first written */ \
      for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1)        \
    if (regmask & 1)                        \
          (frame_saved_regs).regs[regnum] = (next_addr += 12) - 12;    \
      regmask = read_memory_integer (pc + 2, 2); }            \
  /* clrw -(sp); movw ccr,-(sp) may follow.  */                \
  if (0x426742e7 == read_memory_integer (pc, 4))            \
    (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;        \
}
#endif
#if 0
#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;        \
}
#endif
#else
#define FRAME_NUM_ARGS(val, fi) (val = -1)
#endif

/* Things needed for making the inferior call functions.  */

/* Push an empty stack frame, to record the current PC, etc.  */

#define PUSH_DUMMY_FRAME \
{ register CORE_ADDR sp = read_register (SP_REGNUM);            \
  register int regnum;                            \
  char raw_buffer[12];                            \
  sp = push_word (sp, read_register (PC_REGNUM));            \
  sp = push_word (sp, read_register (FP_REGNUM));            \
  write_register (FP_REGNUM, sp);                    \
  for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)        \
    { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);    \
      sp = push_bytes (sp, raw_buffer, 12); }                \
  for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)            \
    sp = push_word (sp, read_register (regnum));            \
  sp = push_word (sp, read_register (PS_REGNUM));            \
  write_register (SP_REGNUM, sp);  }

/* Discard from the stack the innermost frame,
   restoring all saved registers.  */

#define POP_FRAME  \
{ register FRAME frame = get_current_frame ();                \
  register CORE_ADDR fp;                        \
  register int regnum;                            \
  struct frame_saved_regs fsr;                        \
  struct frame_info *fi;                        \
  char raw_buffer[12];                            \
  fi = get_frame_info (frame);                        \
  fp = fi->frame;                            \
  get_frame_saved_regs (fi, &fsr);                    \
  for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)        \
    if (fsr.regs[regnum])                        \
      { read_memory (fsr.regs[regnum], raw_buffer, 12);            \
        write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
  for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)            \
    if (fsr.regs[regnum])                        \
      write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
  if (fsr.regs[PS_REGNUM])                        \
    write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
  write_register (FP_REGNUM, read_memory_integer (fp, 4));        \
  write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));      \
  write_register (SP_REGNUM, fp + 8);                    \
  flush_cached_frames ();                        \
  set_current_frame (create_new_frame (read_register (FP_REGNUM),    \
                    read_pc ())); }

/* This sequence of words is the instructions
     fmovem 0xff,-(sp)
     moveml 0xfffc,-(sp)
     clrw -(sp)
     movew ccr,-(sp)
     /..* The arguments are pushed at this point by GDB;
    no code is needed in the dummy for this.
    The CALL_DUMMY_START_OFFSET gives the position of
    the following jsr instruction.  *../
     jsr @#32323232
     addl #69696969,sp
     bpt
     nop
Note this is 28 bytes.
We actually start executing at the jsr, since the pushing of the
registers is done by PUSH_DUMMY_FRAME.  If this were real code,
the arguments for the function called by the jsr would be pushed
between the moveml and the jsr, and we could allow it to execute through.
But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
and we cannot allow the moveml to push the registers again lest they be
taken for the arguments.  */

#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4e4e71}

#define CALL_DUMMY_LENGTH 28

#define CALL_DUMMY_START_OFFSET 12

/* Insert the specified number of args and function address
   into a call sequence of the above form stored at DUMMYNAME.  */

#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type)     \
{ *(int *)((char *) dummyname + 20) = nargs * 4;  \
  *(int *)((char *) dummyname + 14) = fun; }

/* Interface definitions for kernel debugger KDB.  */

/* Map machine fault codes into signal numbers.
   First subtract 0, divide by 4, then index in a table.
   Faults for which the entry in this table is 0
   are not handled by KDB; the program's own trap handler
   gets to handle then.  */

#define FAULT_CODE_ORIGIN 0
#define FAULT_CODE_UNITS 4
#define FAULT_TABLE    \
{ 0, 0, 0, 0, SIGTRAP, 0, 0, 0, \
  0, SIGTRAP, 0, 0, 0, 0, 0, SIGKILL, \
  0, 0, 0, 0, 0, 0, 0, 0, \
  SIGILL }

/* Start running with a stack stretching from BEG to END.
   BEG and END should be symbols meaningful to the assembler.
   This is used only for kdb.  */

#ifdef MOTOROLA
#define INIT_STACK(beg, end)  \
{ asm (".globl end");         \
  asm ("move.l $ end, sp");      \
  asm ("clr.l fp"); }
#else
#ifdef ALTOS_AS
#define INIT_STACK(beg, end)  \
{ asm ("global end");         \
  asm ("mov.l &end,%sp");      \
  asm ("clr.l %fp"); }
#else
#define INIT_STACK(beg, end)  \
{ asm (".globl end");         \
  asm ("movel $ end, sp");      \
  asm ("clrl fp"); }
#endif
#endif

/* Push the frame pointer register on the stack.  */
#ifdef MOTOROLA
#define PUSH_FRAME_PTR        \
  asm ("move.l fp, -(sp)");
#else
#ifdef ALTOS_AS
#define PUSH_FRAME_PTR        \
  asm ("mov.l %fp, -(%sp)");
#else
#define PUSH_FRAME_PTR        \
  asm ("movel fp, -(sp)");
#endif
#endif

/* Copy the top-of-stack to the frame pointer register.  */
#ifdef MOTOROLA
#define POP_FRAME_PTR  \
  asm ("move.l (sp), fp");
#else
#ifdef ALTOS_AS
#define POP_FRAME_PTR  \
  asm ("mov.l (%sp), %fp");
#else
#define POP_FRAME_PTR  \
  asm ("movl (sp), fp");
#endif
#endif

/* After KDB is entered by a fault, push all registers
   that GDB thinks about (all NUM_REGS of them),
   so that they appear in order of ascending GDB register number.
   The fault code will be on the stack beyond the last register.  */

#ifdef MOTOROLA
#define PUSH_REGISTERS        \
{ asm ("clr.w -(sp)");          \
  asm ("pea (10,sp)");          \
  asm ("movem $ 0xfffe,-(sp)"); }
#else
#ifdef ALTOS_AS
#define PUSH_REGISTERS        \
{ asm ("clr.w -(%sp)");          \
  asm ("pea (10,%sp)");          \
  asm ("movm.l &0xfffe,-(%sp)"); }
#else
#define PUSH_REGISTERS        \
{ asm ("clrw -(sp)");          \
  asm ("pea 10(sp)");          \
  asm ("movem $ 0xfffe,-(sp)"); }
#endif
#endif

/* Assuming the registers (including processor status) have been
   pushed on the stack in order of ascending GDB register number,
   restore them and return to the address in the saved PC register.  */

#ifdef MOTOROLA
#define POP_REGISTERS          \
{ asm ("subi.l $8,28(sp)");     \
  asm ("movem (sp),$ 0xffff"); \
  asm ("rte"); }
#else
#ifdef ALTOS_AS
#define POP_REGISTERS          \
{ asm ("sub.l &8,28(%sp)");     \
  asm ("movem (%sp),&0xffff"); \
  asm ("rte"); }
#else
#define POP_REGISTERS          \
{ asm ("subil $8,28(sp)");     \
  asm ("movem (sp),$ 0xffff"); \
  asm ("rte"); }
#endif
#endif