gdb-2.8

1 files changed, 457 insertions, 0 deletions

diff --git a/gdb/ns32k-pinsn.c b/gdb/ns32k-pinsn.c
new file mode 100644
index 0000000..3247edb
--- /dev/null
+++ b/gdb/ns32k-pinsn.c
@@ -0,0 +1,457 @@
+/* Print 32000 instructions for GDB, the GNU debugger.
+   Copyright (C) 1986,1988 Free Software Foundation, Inc.
+
+GDB is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY.  No author or distributor accepts responsibility to anyone
+for the consequences of using it or for whether it serves any
+particular purpose or works at all, unless he says so in writing.
+Refer to the GDB General Public License for full details.
+
+Everyone is granted permission to copy, modify and redistribute GDB,
+but only under the conditions described in the GDB General Public
+License.  A copy of this license is supposed to have been given to you
+along with GDB so you can know your rights and responsibilities.  It
+should be in a file named COPYING.  Among other things, the copyright
+notice and this notice must be preserved on all copies.
+
+In other words, go ahead and share GDB, but don't try to stop
+anyone else from sharing it farther.  Help stamp out software hoarding!
+*/
+
+#include <stdio.h>
+
+#include "defs.h"
+#include "param.h"
+#include "symtab.h"
+#include "opcode.h"
+
+/* 32000 instructions are never longer than this.  */
+#define MAXLEN 62
+
+/* Number of elements in the opcode table.  */
+#define NOPCODES (sizeof notstrs / sizeof notstrs[0])
+
+extern char *reg_names[];
+
+#define NEXT_IS_ADDR	'|'
+
+/*
+ * extract "count" bits starting "offset" bits
+ * into buffer
+ */
+
+int
+bit_extract (buffer, offset, count)
+     char *buffer;
+     int offset;
+     int count;
+{
+  int result;
+  int mask;
+  int bit;
+
+  buffer += offset >> 3;
+  offset &= 7;
+  bit = 1;
+  result = 0;
+  while (count--) 
+    {
+      if ((*buffer & (1 << offset)))
+	result |= bit;
+      if (++offset == 8)
+	{
+	  offset = 0;
+	  buffer++;
+	}
+      bit <<= 1;
+    }
+  return result;
+}
+
+float
+fbit_extract (buffer, offset, count)
+{
+  union {
+    int ival;
+    float fval;
+  } foo;
+
+  foo.ival = bit_extract (buffer, offset, 32);
+  return foo.fval;
+}
+
+double
+dbit_extract (buffer, offset, count)
+{
+  union {
+    struct {int low, high; } ival;
+    double dval;
+  } foo;
+
+  foo.ival.low = bit_extract (buffer, offset, 32);
+  foo.ival.high = bit_extract (buffer, offset+32, 32);
+  return foo.dval;
+}
+
+sign_extend (value, bits)
+{
+  value = value & ((1 << bits) - 1);
+  return (value & (1 << (bits-1))
+	  ? value | (~((1 << bits) - 1))
+	  : value);
+}
+
+flip_bytes (ptr, count)
+     char *ptr;
+     int count;
+{
+  char tmp;
+
+  while (count > 0)
+    {
+      tmp = *ptr;
+      ptr[0] = ptr[count-1];
+      ptr[count-1] = tmp;
+      ptr++;
+      count -= 2;
+    }
+}
+
+
+/* Print the 32000 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;
+  unsigned short first_word;
+  int gen, disp;
+  int ioffset;		/* bits into instruction */
+  int aoffset;		/* bits into arguments */
+  char arg_bufs[MAX_ARGS+1][ARG_LEN];
+  int argnum;
+  int maxarg;
+
+  read_memory (memaddr, buffer, MAXLEN);
+
+  first_word = *(unsigned short *) buffer;
+  for (i = 0; i < NOPCODES; i++)
+    if ((first_word & ((1 << notstrs[i].detail.obits) - 1))
+	== notstrs[i].detail.code)
+      break;
+
+  /* Handle undefined instructions.  */
+  if (i == NOPCODES)
+    {
+      fprintf (stream, "0%o", buffer[0]);
+      return 1;
+    }
+
+  fprintf (stream, "%s", notstrs[i].name);
+
+  ioffset = notstrs[i].detail.ibits;
+  aoffset = notstrs[i].detail.ibits;
+  d = notstrs[i].detail.args;
+
+  if (*d)
+    {
+      fputc ('\t', stream);
+
+      maxarg = 0;
+      while (*d)
+	{
+	  argnum = *d - '1';
+	  d++;
+	  if (argnum > maxarg && argnum < MAX_ARGS)
+	    maxarg = argnum;
+	  ioffset = print_insn_arg (*d, ioffset, &aoffset, buffer,
+				    memaddr, arg_bufs[argnum]);
+	  d++;
+	}
+      for (argnum = 0; argnum <= maxarg; argnum++)
+	{
+	  CORE_ADDR addr;
+	  char *ch, *index ();
+	  for (ch = arg_bufs[argnum]; *ch;)
+	    {
+	      if (*ch == NEXT_IS_ADDR)
+		{
+		  ++ch;
+		  addr = atoi (ch);
+		  print_address (addr, stream);
+		  while (*ch && *ch != NEXT_IS_ADDR)
+		    ++ch;
+		  if (*ch)
+		    ++ch;
+		}
+	      else
+		putc (*ch++, stream);
+	    }
+	  if (argnum < maxarg)
+	    fprintf (stream, ", ");
+	}
+    }
+  return aoffset / 8;
+}
+
+print_insn_arg (d, ioffset, aoffsetp, buffer, addr, result)
+     char d;
+     int ioffset, *aoffsetp;
+     char *buffer;
+     CORE_ADDR addr;
+     char *result;
+{
+  int addr_mode;
+  float Fvalue;
+  double Lvalue;
+  int Ivalue;
+  int disp1, disp2;
+  int index;
+
+  switch (d)
+    {
+    case 'F':
+    case 'L':
+    case 'B':
+    case 'W':
+    case 'D':
+    case 'A':
+      addr_mode = bit_extract (buffer, ioffset-5, 5);
+      ioffset -= 5;
+      switch (addr_mode)
+	{
+	case 0x0: case 0x1: case 0x2: case 0x3:
+	case 0x4: case 0x5: case 0x6: case 0x7:
+	  switch (d)
+	    {
+	    case 'F':
+	    case 'L':
+	      sprintf (result, "f%d", addr_mode);
+	      break;
+	    default:
+	      sprintf (result, "r%d", addr_mode);
+	    }
+	  break;
+	case 0x8: case 0x9: case 0xa: case 0xb:
+	case 0xc: case 0xd: case 0xe: case 0xf:
+	  disp1 = get_displacement (buffer, aoffsetp);
+	  sprintf (result, "%d(r%d)", disp1, addr_mode & 7);
+	  break;
+	case 0x10:
+	case 0x11:
+	case 0x12:
+	  disp1 = get_displacement (buffer, aoffsetp);
+	  disp2 = get_displacement (buffer, aoffsetp);
+	  sprintf (result, "%d(%d(%s))", disp2, disp1,
+		   addr_mode==0x10?"fp":addr_mode==0x11?"sp":"sb");
+	  break;
+	case 0x13:
+	  sprintf (result, "reserved");
+	  break;
+	case 0x14:
+	  switch (d)
+	    {
+	    case 'B':
+	      Ivalue = bit_extract (buffer, *aoffsetp, 8);
+	      Ivalue = sign_extend (Ivalue, 8);
+	      *aoffsetp += 8;
+	      sprintf (result, "$%d", Ivalue);
+	      break;
+	    case 'W':
+	      Ivalue = bit_extract (buffer, *aoffsetp, 16);
+	      flip_bytes (&Ivalue, 2);
+	      *aoffsetp += 16;
+	      Ivalue = sign_extend (Ivalue, 16);
+	      sprintf (result, "$%d", Ivalue);
+	      break;
+	    case 'D':
+	      Ivalue = bit_extract (buffer, *aoffsetp, 32);
+	      flip_bytes (&Ivalue, 4);
+	      *aoffsetp += 32;
+	      sprintf (result, "$%d", Ivalue);
+	      break;
+	    case 'A':
+	      Ivalue = bit_extract (buffer, *aoffsetp, 32);
+	      flip_bytes (&Ivalue, 4);
+	      *aoffsetp += 32;
+	      sprintf (result, "$|%d|", Ivalue);
+	      break;
+	    case 'F':
+	      Fvalue = fbit_extract (buffer, *aoffsetp, 32);
+	      flip_bytes (&Fvalue, 4);
+	      *aoffsetp += 32;
+	      sprintf (result, "$%g", Fvalue);
+	      break;
+	    case 'L':
+	      Lvalue = dbit_extract (buffer, *aoffsetp, 64);
+	      flip_bytes (&Lvalue, 8);
+	      *aoffsetp += 64;
+	      sprintf (result, "$%g", Lvalue);
+	      break;
+	    }
+	  break;
+	case 0x15:
+	  disp1 = get_displacement (buffer, aoffsetp);
+	  sprintf (result, "@|%d|", disp1);
+	  break;
+	case 0x16:
+	  disp1 = get_displacement (buffer, aoffsetp);
+	  disp2 = get_displacement (buffer, aoffsetp);
+	  sprintf (result, "EXT(%d) + %d", disp1, disp2);
+	  break;
+	case 0x17:
+	  sprintf (result, "tos");
+	  break;
+	case 0x18:
+	  disp1 = get_displacement (buffer, aoffsetp);
+	  sprintf (result, "%d(fp)", disp1);
+	  break;
+	case 0x19:
+	  disp1 = get_displacement (buffer, aoffsetp);
+	  sprintf (result, "%d(sp)", disp1);
+	  break;
+	case 0x1a:
+	  disp1 = get_displacement (buffer, aoffsetp);
+	  sprintf (result, "%d(sb)", disp1);
+	  break;
+	case 0x1b:
+	  disp1 = get_displacement (buffer, aoffsetp);
+	  sprintf (result, "|%d|", addr + disp1);
+	  break;
+	case 0x1c:
+	case 0x1d:
+	case 0x1e:
+	case 0x1f:
+	  index = bit_extract (buffer, *aoffsetp, 8);
+	  *aoffsetp += 8;
+	  print_insn_arg (d, *aoffsetp, aoffsetp, buffer, addr,
+			  result);
+	  {
+	    static char	*ind[] = {"b", "w", "d", "q"};
+	    char *off;
+
+	    off = result + strlen (result);
+	    sprintf (off, "[r%d:%s]", index & 7,
+		     ind[addr_mode & 3]);
+	  }
+	  break;
+	}
+      break;
+    case 'q':
+      Ivalue = bit_extract (buffer, ioffset-4, 4);
+      Ivalue = sign_extend (Ivalue, 4);
+      sprintf (result, "%d", Ivalue);
+      ioffset -= 4;
+      break;
+    case 'r':
+      Ivalue = bit_extract (buffer, ioffset-3, 3);
+      sprintf (result, "r%d", Ivalue&7);
+      ioffset -= 3;
+      break;
+    case 'd':
+      sprintf (result, "%d", get_displacement (buffer, aoffsetp));
+      break;
+    case 'p':
+      sprintf (result, "%c%d%c", NEXT_IS_ADDR,
+	       addr + get_displacement (buffer, aoffsetp),
+	       NEXT_IS_ADDR);
+      break;
+    case 'i':
+      Ivalue = bit_extract (buffer, *aoffsetp, 8);
+      *aoffsetp += 8;
+      sprintf (result, "0x%x", Ivalue);
+      break;
+    }
+  return ioffset;
+}
+
+get_displacement (buffer, aoffsetp)
+     char *buffer;
+     int *aoffsetp;
+{
+  int Ivalue;
+
+  Ivalue = bit_extract (buffer, *aoffsetp, 8);
+  switch (Ivalue & 0xc0)
+    {
+    case 0x00:
+    case 0x40:
+      Ivalue = sign_extend (Ivalue, 7);
+      *aoffsetp += 8;
+      break;
+    case 0x80:
+      Ivalue = bit_extract (buffer, *aoffsetp, 16);
+      flip_bytes (&Ivalue, 2);
+      Ivalue = sign_extend (Ivalue, 14);
+      *aoffsetp += 16;
+      break;
+    case 0xc0:
+      Ivalue = bit_extract (buffer, *aoffsetp, 32);
+      flip_bytes (&Ivalue, 4);
+      Ivalue = sign_extend (Ivalue, 30);
+      *aoffsetp += 32;
+      break;
+    }
+  return Ivalue;
+}
+
+/* Return the number of locals in the current frame given a pc
+   pointing to the enter instruction.  This is used in the macro
+   FRAME_FIND_SAVED_REGS.  */
+
+ns32k_localcount (enter_pc)
+     CORE_ADDR enter_pc;
+{
+  unsigned char localtype;
+  int localcount;
+
+  localtype = read_memory_integer (enter_pc+2, 1);
+  if ((localtype & 0x80) == 0)
+    localcount = localtype;
+  else if ((localtype & 0xc0) == 0x80)
+    localcount = (((localtype & 0x3f) << 8)
+		  | (read_memory_integer (enter_pc+3, 1) & 0xff));
+  else
+    localcount = (((localtype & 0x3f) << 24)
+		  | ((read_memory_integer (enter_pc+3, 1) & 0xff) << 16)
+		  | ((read_memory_integer (enter_pc+4, 1) & 0xff) << 8 )
+		  | (read_memory_integer (enter_pc+5, 1) & 0xff));
+  return localcount;
+}
+
+/*
+ * Get the address of the enter opcode for the function
+ * containing PC, if there is an enter for the function,
+ * and if the pc is between the enter and exit.
+ * Returns positive address if pc is between enter/exit,
+ * 1 if pc before enter or after exit, 0 otherwise.
+ */
+
+CORE_ADDR
+ns32k_get_enter_addr (pc)
+     CORE_ADDR pc;
+{
+  CORE_ADDR enter_addr;
+  unsigned char op;
+
+  if (ABOUT_TO_RETURN (pc))
+    return 1;		/* after exit */
+
+  enter_addr = get_pc_function_start (pc);
+
+  if (pc == enter_addr) 
+    return 1;		/* before enter */
+
+  op = read_memory_integer (enter_addr, 1);
+
+  if (op != 0x82)
+    return 0;		/* function has no enter/exit */
+
+  return enter_addr;	/* pc is between enter and exit */
+}