patch-2.3.4 linux/arch/ppc/xmon/ppc-dis.c

• Lines: 191
• Date: Sat May 22 13:03:00 1999
• Orig file: v2.3.3/linux/arch/ppc/xmon/ppc-dis.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.3/linux/arch/ppc/xmon/ppc-dis.c linux/arch/ppc/xmon/ppc-dis.c
@@ -0,0 +1,190 @@
+/* ppc-dis.c -- Disassemble PowerPC instructions
+   Copyright 1994 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Cygnus Support
+
+This file is part of GDB, GAS, and the GNU binutils.
+
+GDB, GAS, and the GNU binutils are free software; you can redistribute
+them and/or modify them under the terms of the GNU General Public
+License as published by the Free Software Foundation; either version
+2, or (at your option) any later version.
+
+GDB, GAS, and the GNU binutils are distributed in the hope that they
+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 file; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "nonstdio.h"
+#include "ansidecl.h"
+#include "ppc.h"
+
+static int print_insn_powerpc PARAMS ((FILE *, unsigned long insn,
+				       unsigned memaddr, int dialect));
+
+extern void print_address PARAMS((unsigned memaddr));
+
+/* Print a big endian PowerPC instruction.  For convenience, also
+   disassemble instructions supported by the Motorola PowerPC 601.  */
+
+int
+print_insn_big_powerpc (FILE *out, unsigned long insn, unsigned memaddr)
+{
+  return print_insn_powerpc (out, insn, memaddr,
+			     PPC_OPCODE_PPC | PPC_OPCODE_601);
+}
+
+/* Print a PowerPC or POWER instruction.  */
+
+static int
+print_insn_powerpc (FILE *out, unsigned long insn, unsigned memaddr,
+		    int dialect)
+{
+  const struct powerpc_opcode *opcode;
+  const struct powerpc_opcode *opcode_end;
+  unsigned long op;
+
+  /* Get the major opcode of the instruction.  */
+  op = PPC_OP (insn);
+
+  /* Find the first match in the opcode table.  We could speed this up
+     a bit by doing a binary search on the major opcode.  */
+  opcode_end = powerpc_opcodes + powerpc_num_opcodes;
+  for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
+    {
+      unsigned long table_op;
+      const unsigned char *opindex;
+      const struct powerpc_operand *operand;
+      int invalid;
+      int need_comma;
+      int need_paren;
+
+      table_op = PPC_OP (opcode->opcode);
+      if (op < table_op)
+		break;
+      if (op > table_op)
+		continue;
+
+      if ((insn & opcode->mask) != opcode->opcode
+	  || (opcode->flags & dialect) == 0)
+		continue;
+
+      /* Make two passes over the operands.  First see if any of them
+		 have extraction functions, and, if they do, make sure the
+		 instruction is valid.  */
+      invalid = 0;
+      for (opindex = opcode->operands; *opindex != 0; opindex++)
+		{
+		  operand = powerpc_operands + *opindex;
+		  if (operand->extract)
+		    (*operand->extract) (insn, &invalid);
+		}
+      if (invalid)
+		continue;
+
+      /* The instruction is valid.  */
+      fprintf(out, "%s", opcode->name);
+      if (opcode->operands[0] != 0)
+		fprintf(out, "\t");
+
+      /* Now extract and print the operands.  */
+      need_comma = 0;
+      need_paren = 0;
+      for (opindex = opcode->operands; *opindex != 0; opindex++)
+		{
+		  long value;
+
+		  operand = powerpc_operands + *opindex;
+
+		  /* Operands that are marked FAKE are simply ignored.  We
+		     already made sure that the extract function considered
+		     the instruction to be valid.  */
+		  if ((operand->flags & PPC_OPERAND_FAKE) != 0)
+		    continue;
+
+		  /* Extract the value from the instruction.  */
+		  if (operand->extract)
+		    value = (*operand->extract) (insn, (int *) 0);
+		  else
+		    {
+		      value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
+		      if ((operand->flags & PPC_OPERAND_SIGNED) != 0
+			  && (value & (1 << (operand->bits - 1))) != 0)
+			value -= 1 << operand->bits;
+		    }
+
+		  /* If the operand is optional, and the value is zero, don't
+		     print anything.  */
+		  if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
+		      && (operand->flags & PPC_OPERAND_NEXT) == 0
+		      && value == 0)
+		    continue;
+
+		  if (need_comma)
+		    {
+		      fprintf(out, ",");
+		      need_comma = 0;
+		    }
+
+		  /* Print the operand as directed by the flags.  */
+		  if ((operand->flags & PPC_OPERAND_GPR) != 0)
+		    fprintf(out, "r%ld", value);
+		  else if ((operand->flags & PPC_OPERAND_FPR) != 0)
+		    fprintf(out, "f%ld", value);
+		  else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
+		    print_address (memaddr + value);
+		  else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
+		    print_address (value & 0xffffffff);
+		  else if ((operand->flags & PPC_OPERAND_CR) == 0
+			   || (dialect & PPC_OPCODE_PPC) == 0)
+		    fprintf(out, "%ld", value);
+		  else
+		    {
+		      if (operand->bits == 3)
+				fprintf(out, "cr%d", value);
+		      else
+			{
+			  static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
+			  int cr;
+			  int cc;
+
+			  cr = value >> 2;
+			  if (cr != 0)
+			    fprintf(out, "4*cr%d", cr);
+			  cc = value & 3;
+			  if (cc != 0)
+			    {
+			      if (cr != 0)
+					fprintf(out, "+");
+			      fprintf(out, "%s", cbnames[cc]);
+			    }
+			}
+	    }
+
+	  if (need_paren)
+	    {
+	      fprintf(out, ")");
+	      need_paren = 0;
+	    }
+
+	  if ((operand->flags & PPC_OPERAND_PARENS) == 0)
+	    need_comma = 1;
+	  else
+	    {
+	      fprintf(out, "(");
+	      need_paren = 1;
+	    }
+	}
+
+      /* We have found and printed an instruction; return.  */
+      return 4;
+    }
+
+  /* We could not find a match.  */
+  fprintf(out, ".long 0x%lx", insn);
+
+  return 4;
+}