Johns release

1 files changed, 774 insertions, 0 deletions

diff --git a/gdb/m68k-pinsn.c b/gdb/m68k-pinsn.c
new file mode 100644
index 0000000..608bc25
--- /dev/null
+++ b/gdb/m68k-pinsn.c
@@ -0,0 +1,774 @@
+/* Print m68k instructions for GDB, the GNU debugger.
+   Copyright (C) 1986, 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.  */
+
+#include <stdio.h>
+
+#include "defs.h"
+#include "param.h"
+#include "symtab.h"
+#include "m68k-opcode.h"
+#include "gdbcore.h"
+
+/* 68k instructions are never longer than this many bytes.  */
+#define MAXLEN 22
+
+/* Number of elements in the opcode table.  */
+#define NOPCODES (sizeof m68k_opcodes / sizeof m68k_opcodes[0])
+
+extern char *reg_names[];
+char *fpcr_names[] = { "", "fpiar", "fpsr", "fpiar/fpsr", "fpcr",
+		     "fpiar/fpcr", "fpsr/fpcr", "fpiar-fpcr"};
+
+static unsigned char *print_insn_arg ();
+static unsigned char *print_indexed ();
+static void print_base ();
+static int fetch_arg ();
+
+#define NEXTBYTE(p)  (p += 2, ((char *)p)[-1])
+
+#define NEXTWORD(p)  \
+  (p += 2, ((((char *)p)[-2]) << 8) + p[-1])
+
+#define NEXTLONG(p)  \
+  (p += 4, (((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])
+
+#define NEXTSINGLE(p) \
+  (p += 4, *((float *)(p - 4)))
+
+#define NEXTDOUBLE(p) \
+  (p += 8, *((double *)(p - 8)))
+
+#define NEXTEXTEND(p) \
+  (p += 12, 0.0)	/* Need a function to convert from extended to double
+			   precision... */
+
+#define NEXTPACKED(p) \
+  (p += 12, 0.0)	/* Need a function to convert from packed to double
+			   precision.   Actually, it's easier to print a
+			   packed number than a double anyway, so maybe
+			   there should be a special case to handle this... */
+
+/* Print the m68k instruction at address MEMADDR in debugged memory,
+   on STREAM.  Returns length of the instruction, in bytes.  */
+
+int
+print_insn (memaddr, stream)
+     CORE_ADDR memaddr;
+     FILE *stream;
+{
+  unsigned char buffer[MAXLEN];
+  register int i;
+  register unsigned char *p;
+  register char *d;
+  register int bestmask;
+  int best;
+
+  read_memory (memaddr, buffer, MAXLEN);
+
+  bestmask = 0;
+  best = -1;
+  for (i = 0; i < NOPCODES; i++)
+    {
+      register unsigned int opcode = m68k_opcodes[i].opcode;
+      register unsigned int match = m68k_opcodes[i].match;
+      if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24)))
+	  && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16)))
+	  && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8)))
+	  && ((0xff & buffer[3] & match) == (0xff & opcode)))
+	{
+	  /* Don't use for printout the variants of divul and divsl
+	     that have the same register number in two places.
+	     The more general variants will match instead.  */
+	  for (d = m68k_opcodes[i].args; *d; d += 2)
+	    if (d[1] == 'D')
+	      break;
+
+	  /* Don't use for printout the variants of most floating
+	     point coprocessor instructions which use the same
+	     register number in two places, as above. */
+	  if (*d == 0)
+	    for (d = m68k_opcodes[i].args; *d; d += 2)
+	      if (d[1] == 't')
+		break;
+
+	  if (*d == 0 && match > bestmask)
+	    {
+	      best = i;
+	      bestmask = match;
+	    }
+	}
+    }
+
+  /* Handle undefined instructions.  */
+  if (best < 0)
+    {
+      fprintf_filtered (stream, "0%o", (buffer[0] << 8) + buffer[1]);
+      return 2;
+    }
+
+  fprintf_filtered (stream, "%s", m68k_opcodes[best].name);
+
+  /* Point at first word of argument data,
+     and at descriptor for first argument.  */
+  p = buffer + 2;
+  
+  /* Why do this this way? -MelloN */
+  for (d = m68k_opcodes[best].args; *d; d += 2)
+    {
+      if (d[0] == '#')
+	{
+	  if (d[1] == 'l' && p - buffer < 6)
+	    p = buffer + 6;
+	  else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8' )
+	    p = buffer + 4;
+	}
+      if (d[1] >= '1' && d[1] <= '3' && p - buffer < 4)
+	p = buffer + 4;
+      if (d[1] >= '4' && d[1] <= '6' && p - buffer < 6)
+	p = buffer + 6;
+      if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4)
+	p = buffer + 4;
+    }
+
+  d = m68k_opcodes[best].args;
+
+  if (*d)
+    fputs_filtered (" ", stream);
+
+  while (*d)
+    {
+      p = print_insn_arg (d, buffer, p, memaddr + p - buffer, stream);
+      d += 2;
+      if (*d && *(d - 2) != 'I' && *d != 'k')
+	fputs_filtered (",", stream);
+    }
+  return p - buffer;
+}
+
+static unsigned char *
+print_insn_arg (d, buffer, p, addr, stream)
+     char *d;
+     unsigned char *buffer;
+     register unsigned char *p;
+     CORE_ADDR addr;		/* PC for this arg to be relative to */
+     FILE *stream;
+{
+  register int val;
+  register int place = d[1];
+  int regno;
+  register char *regname;
+  register unsigned char *p1;
+  register double flval;
+  int flt_p;
+
+  switch (*d)
+    {
+    case 'C':
+      fprintf_filtered (stream, "ccr");
+      break;
+
+    case 'S':
+      fprintf_filtered (stream, "sr");
+      break;
+
+    case 'U':
+      fprintf_filtered (stream, "usp");
+      break;
+
+    case 'J':
+      {
+	static struct { char *name; int value; } names[]
+	  = {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002},
+	     {"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802},
+	     {"msp", 0x803}, {"isp", 0x804}};
+
+	val = fetch_arg (buffer, place, 12);
+	for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--)
+	  if (names[regno].value == val)
+	    {
+	      fprintf_filtered (stream, names[regno].name);
+	      break;
+	    }
+	if (regno < 0)
+	  fprintf_filtered (stream, "%d", val);
+      }
+      break;
+
+    case 'Q':
+      val = fetch_arg (buffer, place, 3);
+      /* 0 means 8, except for the bkpt instruction... */
+      if (val == 0 && d[1] != 's')
+	val = 8;
+      fprintf_filtered (stream, "#%d", val);
+      break;
+
+    case 'M':
+      val = fetch_arg (buffer, place, 8);
+      if (val & 0x80)
+	val = val - 0x100;
+      fprintf_filtered (stream, "#%d", val);
+      break;
+
+    case 'T':
+      val = fetch_arg (buffer, place, 4);
+      fprintf_filtered (stream, "#%d", val);
+      break;
+
+    case 'D':
+      fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 3)]);
+      break;
+
+    case 'A':
+      fprintf_filtered (stream, "%s",
+			reg_names[fetch_arg (buffer, place, 3) + 010]);
+      break;
+
+    case 'R':
+      fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 4)]);
+      break;
+
+    case 'F':
+      fprintf_filtered (stream, "fp%d", fetch_arg (buffer, place, 3));
+      break;
+
+    case 'O':
+      val = fetch_arg (buffer, place, 6);
+      if (val & 0x20)
+	fprintf_filtered (stream, "%s", reg_names [val & 7]);
+      else
+	fprintf_filtered (stream, "%d", val);
+      break;
+
+    case '+':
+      fprintf_filtered (stream, "%s@+",
+			reg_names[fetch_arg (buffer, place, 3) + 8]);
+      break;
+
+    case '-':
+      fprintf_filtered (stream, "%s@-",
+	       reg_names[fetch_arg (buffer, place, 3) + 8]);
+      break;
+
+    case 'k':
+      if (place == 'k')
+	fprintf_filtered (stream, "{%s}", reg_names[fetch_arg (buffer, place, 3)]);
+      else if (place == 'C')
+	{
+	  val = fetch_arg (buffer, place, 7);
+	  if ( val > 63 )		/* This is a signed constant. */
+	    val -= 128;
+	  fprintf_filtered (stream, "{#%d}", val);
+	}
+      else
+	error ("Invalid arg format in opcode table: \"%c%c\".",
+	       *d, place);
+      break;
+
+    case '#':
+    case '^':
+      p1 = buffer + (*d == '#' ? 2 : 4);
+      if (place == 's')
+	val = fetch_arg (buffer, place, 4);
+      else if (place == 'C')
+	val = fetch_arg (buffer, place, 7);
+      else if (place == '8')
+	val = fetch_arg (buffer, place, 3);
+      else if (place == '3')
+	val = fetch_arg (buffer, place, 8);
+      else if (place == 'b')
+	val = NEXTBYTE (p1);
+      else if (place == 'w')
+	val = NEXTWORD (p1);
+      else if (place == 'l')
+	val = NEXTLONG (p1);
+      else
+	error ("Invalid arg format in opcode table: \"%c%c\".",
+	       *d, place);
+      fprintf_filtered (stream, "#%d", val);
+      break;
+
+    case 'B':
+      if (place == 'b')
+	val = NEXTBYTE (p);
+      else if (place == 'w')
+	val = NEXTWORD (p);
+      else if (place == 'l')
+	val = NEXTLONG (p);
+      else if (place == 'g')
+	{
+	  val = ((char *)buffer)[1];
+	  if (val == 0)
+	    val = NEXTWORD (p);
+	  else if (val == -1)
+	    val = NEXTLONG (p);
+	}
+      else if (place == 'c')
+	{
+	  if (buffer[1] & 0x40)		/* If bit six is one, long offset */
+	    val = NEXTLONG (p);
+	  else
+	    val = NEXTWORD (p);
+	}
+      else
+	error ("Invalid arg format in opcode table: \"%c%c\".",
+	       *d, place);
+
+      print_address (addr + val, stream);
+      break;
+
+    case 'd':
+      val = NEXTWORD (p);
+      fprintf_filtered (stream, "%s@(%d)",
+			reg_names[fetch_arg (buffer, place, 3)], val);
+      break;
+
+    case 's':
+      fprintf_filtered (stream, "%s",
+			fpcr_names[fetch_arg (buffer, place, 3)]);
+      break;
+
+    case 'I':
+      val = fetch_arg (buffer, 'd', 3);		  /* Get coprocessor ID... */
+      if (val != 1)				/* Unusual coprocessor ID? */
+	fprintf_filtered (stream, "(cpid=%d) ", val);
+      if (place == 'i')
+	p += 2;			     /* Skip coprocessor extended operands */
+      break;
+
+    case '*':
+    case '~':
+    case '%':
+    case ';':
+    case '@':
+    case '!':
+    case '$':
+    case '?':
+    case '/':
+    case '&':
+
+      if (place == 'd')
+	{
+	  val = fetch_arg (buffer, 'x', 6);
+	  val = ((val & 7) << 3) + ((val >> 3) & 7);
+	}
+      else
+	val = fetch_arg (buffer, 's', 6);
+
+      /* Get register number assuming address register.  */
+      regno = (val & 7) + 8;
+      regname = reg_names[regno];
+      switch (val >> 3)
+	{
+	case 0:
+	  fprintf_filtered (stream, "%s", reg_names[val]);
+	  break;
+
+	case 1:
+	  fprintf_filtered (stream, "%s", regname);
+	  break;
+
+	case 2:
+	  fprintf_filtered (stream, "%s@", regname);
+	  break;
+
+	case 3:
+	  fprintf_filtered (stream, "%s@+", regname);
+	  break;
+
+	case 4:
+	  fprintf_filtered (stream, "%s@-", regname);
+	  break;
+
+	case 5:
+	  val = NEXTWORD (p);
+	  fprintf_filtered (stream, "%s@(%d)", regname, val);
+	  break;
+
+	case 6:
+	  p = print_indexed (regno, p, addr, stream);
+	  break;
+
+	case 7:
+	  switch (val & 7)
+	    {
+	    case 0:
+	      val = NEXTWORD (p);
+	      fprintf_filtered (stream, "@#");
+	      print_address (val, stream);
+	      break;
+
+	    case 1:
+	      val = NEXTLONG (p);
+	      fprintf_filtered (stream, "@#");
+	      print_address (val, stream);
+	      break;
+
+	    case 2:
+	      val = NEXTWORD (p);
+	      print_address (addr + val, stream);
+	      break;
+
+	    case 3:
+	      p = print_indexed (-1, p, addr, stream);
+	      break;
+
+	    case 4:
+	      flt_p = 1;	/* Assume it's a float... */
+	      switch( place )
+	      {
+		case 'b':
+		  val = NEXTBYTE (p);
+		  flt_p = 0;
+		  break;
+
+		case 'w':
+		  val = NEXTWORD (p);
+		  flt_p = 0;
+		  break;
+
+		case 'l':
+		  val = NEXTLONG (p);
+		  flt_p = 0;
+		  break;
+
+		case 'f':
+		  flval = NEXTSINGLE(p);
+		  break;
+
+		case 'F':
+		  flval = NEXTDOUBLE(p);
+		  break;
+
+		case 'x':
+		  flval = NEXTEXTEND(p);
+		  break;
+
+		case 'p':
+		  flval = NEXTPACKED(p);
+		  break;
+
+		default:
+		  error ("Invalid arg format in opcode table: \"%c%c\".",
+		       *d, place);
+	      }
+	      if ( flt_p )	/* Print a float? */
+		fprintf_filtered (stream, "#%g", flval);
+	      else
+		fprintf_filtered (stream, "#%d", val);
+	      break;
+
+	    default:
+	      fprintf_filtered (stream, "<invalid address mode 0%o>", val);
+	    }
+	}
+      break;
+
+    case 'L':
+    case 'l':
+	if (place == 'w')
+	  {
+	    char doneany;
+	    p1 = buffer + 2;
+	    val = NEXTWORD (p1);
+	    /* Move the pointer ahead if this point is farther ahead
+	       than the last.  */
+	    p = p1 > p ? p1 : p;
+	    if (val == 0)
+	      {
+		fputs_filtered ("#0", stream);
+		break;
+	      }
+	    if (*d == 'l')
+	      {
+		register int newval = 0;
+		for (regno = 0; regno < 16; ++regno)
+		  if (val & (0x8000 >> regno))
+		    newval |= 1 << regno;
+		val = newval;
+	      }
+	    val &= 0xffff;
+	    doneany = 0;
+	    for (regno = 0; regno < 16; ++regno)
+	      if (val & (1 << regno))
+		{
+		  int first_regno;
+		  if (doneany)
+		    fputs_filtered ("/", stream);
+		  doneany = 1;
+		  fprintf_filtered (stream, "%s", reg_names[regno]);
+		  first_regno = regno;
+		  while (val & (1 << (regno + 1)))
+		    ++regno;
+		  if (regno > first_regno)
+		    fprintf_filtered (stream, "-%s", reg_names[regno]);
+		}
+	  }
+	else if (place == '3')
+	  {
+	    /* `fmovem' insn.  */
+	    char doneany;
+	    val = fetch_arg (buffer, place, 8);
+	    if (val == 0)
+	      {
+		fputs_filtered ("#0", stream);
+		break;
+	      }
+	    if (*d == 'l')
+	      {
+		register int newval = 0;
+		for (regno = 0; regno < 8; ++regno)
+		  if (val & (0x80 >> regno))
+		    newval |= 1 << regno;
+		val = newval;
+	      }
+	    val &= 0xff;
+	    doneany = 0;
+	    for (regno = 0; regno < 8; ++regno)
+	      if (val & (1 << regno))
+		{
+		  int first_regno;
+		  if (doneany)
+		    fputs_filtered ("/", stream);
+		  doneany = 1;
+		  fprintf_filtered (stream, "fp%d", regno);
+		  first_regno = regno;
+		  while (val & (1 << (regno + 1)))
+		    ++regno;
+		  if (regno > first_regno)
+		    fprintf_filtered (stream, "-fp%d", regno);
+		}
+	  }
+	else
+	  abort ();
+      break;
+
+    default:
+      error ("Invalid arg format in opcode table: \"%c\".", *d);
+    }
+
+  return (unsigned char *) p;
+}
+
+/* Fetch BITS bits from a position in the instruction specified by CODE.
+   CODE is a "place to put an argument", or 'x' for a destination
+   that is a general address (mode and register).
+   BUFFER contains the instruction.  */
+
+static int
+fetch_arg (buffer, code, bits)
+     unsigned char *buffer;
+     char code;
+     int bits;
+{
+  register int val;
+  switch (code)
+    {
+    case 's':
+      val = buffer[1];
+      break;
+
+    case 'd':			/* Destination, for register or quick.  */
+      val = (buffer[0] << 8) + buffer[1];
+      val >>= 9;
+      break;
+
+    case 'x':			/* Destination, for general arg */
+      val = (buffer[0] << 8) + buffer[1];
+      val >>= 6;
+      break;
+
+    case 'k':
+      val = (buffer[3] >> 4);
+      break;
+
+    case 'C':
+      val = buffer[3];
+      break;
+
+    case '1':
+      val = (buffer[2] << 8) + buffer[3];
+      val >>= 12;
+      break;
+
+    case '2':
+      val = (buffer[2] << 8) + buffer[3];
+      val >>= 6;
+      break;
+
+    case '3':
+    case 'j':
+      val = (buffer[2] << 8) + buffer[3];
+      break;
+
+    case '4':
+      val = (buffer[4] << 8) + buffer[5];
+      val >>= 12;
+      break;
+
+    case '5':
+      val = (buffer[4] << 8) + buffer[5];
+      val >>= 6;
+      break;
+
+    case '6':
+      val = (buffer[4] << 8) + buffer[5];
+      break;
+
+    case '7':
+      val = (buffer[2] << 8) + buffer[3];
+      val >>= 7;
+      break;
+      
+    case '8':
+      val = (buffer[2] << 8) + buffer[3];
+      val >>= 10;
+      break;
+
+    default:
+      abort ();
+    }
+
+  switch (bits)
+    {
+    case 3:
+      return val & 7;
+    case 4:
+      return val & 017;
+    case 5:
+      return val & 037;
+    case 6:
+      return val & 077;
+    case 7:
+      return val & 0177;
+    case 8:
+      return val & 0377;
+    case 12:
+      return val & 07777;
+    default:
+      abort ();
+    }
+}
+
+/* Print an indexed argument.  The base register is BASEREG (-1 for pc).
+   P points to extension word, in buffer.
+   ADDR is the nominal core address of that extension word.  */
+
+static unsigned char *
+print_indexed (basereg, p, addr, stream)
+     int basereg;
+     unsigned char *p;
+     FILE *stream;
+     CORE_ADDR addr;
+{
+  register int word;
+  static char *scales[] = {"", "*2", "*4", "*8"};
+  register int base_disp;
+  register int outer_disp;
+  char buf[40];
+
+  word = NEXTWORD (p);
+
+  /* Generate the text for the index register.
+     Where this will be output is not yet determined.  */
+  sprintf (buf, "[%s.%c%s]",
+	   reg_names[(word >> 12) & 0xf],
+	   (word & 0x800) ? 'l' : 'w',
+	   scales[(word >> 9) & 3]);
+
+  /* Handle the 68000 style of indexing.  */
+
+  if ((word & 0x100) == 0)
+    {
+      print_base (basereg,
+		  ((word & 0x80) ? word | 0xff00 : word & 0xff)
+		  + ((basereg == -1) ? addr : 0),
+		  stream);
+      fputs_filtered (buf, stream);
+      return p;
+    }
+
+  /* Handle the generalized kind.  */
+  /* First, compute the displacement to add to the base register.  */
+
+  if (word & 0200)
+    basereg = -2;
+  if (word & 0100)
+    buf[0] = 0;
+  base_disp = 0;
+  switch ((word >> 4) & 3)
+    {
+    case 2:
+      base_disp = NEXTWORD (p);
+      break;
+    case 3:
+      base_disp = NEXTLONG (p);
+    }
+  if (basereg == -1)
+    base_disp += addr;
+
+  /* Handle single-level case (not indirect) */
+
+  if ((word & 7) == 0)
+    {
+      print_base (basereg, base_disp, stream);
+      fputs_filtered (buf, stream);
+      return p;
+    }
+
+  /* Two level.  Compute displacement to add after indirection.  */
+
+  outer_disp = 0;
+  switch (word & 3)
+    {
+    case 2:
+      outer_disp = NEXTWORD (p);
+      break;
+    case 3:
+      outer_disp = NEXTLONG (p);
+    }
+
+  fprintf_filtered (stream, "%d(", outer_disp);
+  print_base (basereg, base_disp, stream);
+
+  /* If postindexed, print the closeparen before the index.  */
+  if (word & 4)
+    fprintf_filtered (stream, ")%s", buf);
+  /* If preindexed, print the closeparen after the index.  */
+  else
+    fprintf_filtered (stream, "%s)", buf);
+
+  return p;
+}
+
+/* Print a base register REGNO and displacement DISP, on STREAM.
+   REGNO = -1 for pc, -2 for none (suppressed).  */
+
+static void
+print_base (regno, disp, stream)
+     int regno;
+     int disp;
+     FILE *stream;
+{
+  if (regno == -2)
+    fprintf_filtered (stream, "%d", disp);
+  else if (regno == -1)
+    fprintf_filtered (stream, "0x%x", disp);
+  else
+    fprintf_filtered (stream, "%d(%s)", disp, reg_names[regno]);
+}