Add openRISC support in opcodes

1 files changed, 533 insertions, 0 deletions

diff --git a/opcodes/openrisc-asm.c b/opcodes/openrisc-asm.c
new file mode 100644
index 0000000..7f2e951
--- /dev/null
+++ b/opcodes/openrisc-asm.c
@@ -0,0 +1,533 @@
+/* Assembler interface for targets using CGEN. -*- C -*-
+   CGEN: Cpu tools GENerator
+
+THIS FILE IS MACHINE GENERATED WITH CGEN.
+- the resultant file is machine generated, cgen-asm.in isn't
+
+Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+
+This file is part of the GNU Binutils and GDB, the GNU debugger.
+
+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, 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.,
+59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* ??? Eventually more and more of this stuff can go to cpu-independent files.
+   Keep that in mind.  */
+
+#include "sysdep.h"
+#include <ctype.h>
+#include <stdio.h>
+#include "ansidecl.h"
+#include "bfd.h"
+#include "symcat.h"
+#include "openrisc-desc.h"
+#include "openrisc-opc.h"
+#include "opintl.h"
+
+#undef min
+#define min(a,b) ((a) < (b) ? (a) : (b))
+#undef max
+#define max(a,b) ((a) > (b) ? (a) : (b))
+
+static const char * parse_insn_normal
+     PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *));
+
+/* -- assembler routines inserted here */
+
+/* -- asm.c */
+
+#define CGEN_VERBOSE_ASSEMBLER_ERRORS
+
+long
+openrisc_sign_extend_16bit (value)
+     long value;
+{
+  return (long) (short) value;
+}
+
+
+/* Handle hi().  */
+
+static const char *
+parse_hi16 (cd, strp, opindex, valuep)
+     CGEN_CPU_DESC cd;
+     const char **strp;
+     int opindex;
+     unsigned long *valuep;
+{
+  const char *errmsg;
+  enum cgen_parse_operand_result result_type;
+  bfd_vma value;
+
+  if (**strp == '#')
+    ++*strp;
+
+  if (strncasecmp (*strp, "hi(", 3) == 0)
+    {
+      *strp += 3;
+
+#if 0
+      errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
+      if (errmsg != NULL)
+        fprintf (stderr, "parse_hi: %s\n", errmsg);
+      if (errmsg != NULL)
+#endif
+        errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
+                                     &result_type, &value);
+      if (**strp != ')')
+        return "missing `)'";
+      ++*strp;
+      if (errmsg == NULL
+          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
+        value >>= 16;
+      *valuep = (long) (short) value;
+
+      return errmsg;
+    }
+  else
+    {
+      if (**strp == '-')
+        errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
+      else
+        errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
+    }
+  *valuep = (long) (short) (value & 0xffff);
+  return errmsg;
+}
+
+
+/* Handle lo() */
+
+static const char *
+parse_lo16 (cd, strp, opindex, valuep)
+     CGEN_CPU_DESC cd;
+     const char **strp;
+     int opindex;
+     unsigned long *valuep;
+{
+  const char *errmsg;
+  enum cgen_parse_operand_result result_type;
+  bfd_vma value;
+
+  if (**strp == '#')
+    ++*strp;
+
+  if (strncasecmp (*strp, "lo(", 3) == 0)
+    {
+      *strp += 3;
+
+#if 0 
+      errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
+      if (errmsg != NULL)
+        fprintf (stderr, "parse_lo: %s\n", errmsg);
+
+      if (errmsg != NULL)
+#endif
+        errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
+                                     &result_type, &value);
+      if (**strp != ')')
+        return "missing `)'";
+      ++*strp;
+      if (errmsg == NULL
+          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
+        value &= 0xffff;
+      *valuep = (long) (short) value;
+
+      return errmsg;
+    }
+
+  if (**strp == '-')
+    errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
+  else
+    errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
+  *valuep = (long) (short) (value & 0xffff);
+  return errmsg;
+}
+
+/* -- */
+
+/* Main entry point for operand parsing.
+
+   This function is basically just a big switch statement.  Earlier versions
+   used tables to look up the function to use, but
+   - if the table contains both assembler and disassembler functions then
+     the disassembler contains much of the assembler and vice-versa,
+   - there's a lot of inlining possibilities as things grow,
+   - using a switch statement avoids the function call overhead.
+
+   This function could be moved into `parse_insn_normal', but keeping it
+   separate makes clear the interface between `parse_insn_normal' and each of
+   the handlers.
+*/
+
+const char *
+openrisc_cgen_parse_operand (cd, opindex, strp, fields)
+     CGEN_CPU_DESC cd;
+     int opindex;
+     const char ** strp;
+     CGEN_FIELDS * fields;
+{
+  const char * errmsg = NULL;
+  /* Used by scalar operands that still need to be parsed.  */
+  long junk;
+
+  switch (opindex)
+    {
+    case OPENRISC_OPERAND_ABS_26 :
+      {
+        bfd_vma value;
+        errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_ABS_26, 0, NULL,  & value);
+        fields->f_abs26 = value;
+      }
+      break;
+    case OPENRISC_OPERAND_DISP_26 :
+      {
+        bfd_vma value;
+        errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_DISP_26, 0, NULL,  & value);
+        fields->f_disp26 = value;
+      }
+      break;
+    case OPENRISC_OPERAND_HI16 :
+      errmsg = parse_hi16 (cd, strp, OPENRISC_OPERAND_HI16, &fields->f_simm16);
+      break;
+    case OPENRISC_OPERAND_LO16 :
+      errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_LO16, &fields->f_lo16);
+      break;
+    case OPENRISC_OPERAND_OP_F_23 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_23, &fields->f_op4);
+      break;
+    case OPENRISC_OPERAND_OP_F_3 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_3, &fields->f_op5);
+      break;
+    case OPENRISC_OPERAND_RA :
+      errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r2);
+      break;
+    case OPENRISC_OPERAND_RB :
+      errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r3);
+      break;
+    case OPENRISC_OPERAND_RD :
+      errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r1);
+      break;
+    case OPENRISC_OPERAND_SIMM_16 :
+      errmsg = cgen_parse_signed_integer (cd, strp, OPENRISC_OPERAND_SIMM_16, &fields->f_simm16);
+      break;
+    case OPENRISC_OPERAND_UI16NC :
+      errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_UI16NC, &fields->f_i16nc);
+      break;
+    case OPENRISC_OPERAND_UIMM_16 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_16, &fields->f_uimm16);
+      break;
+    case OPENRISC_OPERAND_UIMM_5 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_5, &fields->f_uimm5);
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
+      abort ();
+  }
+
+  return errmsg;
+}
+
+cgen_parse_fn * const openrisc_cgen_parse_handlers[] = 
+{
+  parse_insn_normal,
+};
+
+void
+openrisc_cgen_init_asm (cd)
+     CGEN_CPU_DESC cd;
+{
+  openrisc_cgen_init_opcode_table (cd);
+  openrisc_cgen_init_ibld_table (cd);
+  cd->parse_handlers = & openrisc_cgen_parse_handlers[0];
+  cd->parse_operand = openrisc_cgen_parse_operand;
+}
+
+
+/* Default insn parser.
+
+   The syntax string is scanned and operands are parsed and stored in FIELDS.
+   Relocs are queued as we go via other callbacks.
+
+   ??? Note that this is currently an all-or-nothing parser.  If we fail to
+   parse the instruction, we return 0 and the caller will start over from
+   the beginning.  Backtracking will be necessary in parsing subexpressions,
+   but that can be handled there.  Not handling backtracking here may get
+   expensive in the case of the m68k.  Deal with later.
+
+   Returns NULL for success, an error message for failure.
+*/
+
+static const char *
+parse_insn_normal (cd, insn, strp, fields)
+     CGEN_CPU_DESC cd;
+     const CGEN_INSN *insn;
+     const char **strp;
+     CGEN_FIELDS *fields;
+{
+  /* ??? Runtime added insns not handled yet.  */
+  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
+  const char *str = *strp;
+  const char *errmsg;
+  const char *p;
+  const CGEN_SYNTAX_CHAR_TYPE * syn;
+#ifdef CGEN_MNEMONIC_OPERANDS
+  /* FIXME: wip */
+  int past_opcode_p;
+#endif
+
+  /* For now we assume the mnemonic is first (there are no leading operands).
+     We can parse it without needing to set up operand parsing.
+     GAS's input scrubber will ensure mnemonics are lowercase, but we may
+     not be called from GAS.  */
+  p = CGEN_INSN_MNEMONIC (insn);
+  while (*p && tolower (*p) == tolower (*str))
+    ++p, ++str;
+
+  if (* p)
+    return _("unrecognized instruction");
+
+#ifndef CGEN_MNEMONIC_OPERANDS
+  if (* str && !isspace (* str))
+    return _("unrecognized instruction");
+#endif
+
+  CGEN_INIT_PARSE (cd);
+  cgen_init_parse_operand (cd);
+#ifdef CGEN_MNEMONIC_OPERANDS
+  past_opcode_p = 0;
+#endif
+
+  /* We don't check for (*str != '\0') here because we want to parse
+     any trailing fake arguments in the syntax string.  */
+  syn = CGEN_SYNTAX_STRING (syntax);
+
+  /* Mnemonics come first for now, ensure valid string.  */
+  if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
+    abort ();
+
+  ++syn;
+
+  while (* syn != 0)
+    {
+      /* Non operand chars must match exactly.  */
+      if (CGEN_SYNTAX_CHAR_P (* syn))
+	{
+	  /* FIXME: While we allow for non-GAS callers above, we assume the
+	     first char after the mnemonic part is a space.  */
+	  /* FIXME: We also take inappropriate advantage of the fact that
+	     GAS's input scrubber will remove extraneous blanks.  */
+	  if (tolower (*str) == tolower (CGEN_SYNTAX_CHAR (* syn)))
+	    {
+#ifdef CGEN_MNEMONIC_OPERANDS
+	      if (CGEN_SYNTAX_CHAR(* syn) == ' ')
+		past_opcode_p = 1;
+#endif
+	      ++ syn;
+	      ++ str;
+	    }
+	  else if (*str)
+	    {
+	      /* Syntax char didn't match.  Can't be this insn.  */
+	      static char msg [80];
+	      /* xgettext:c-format */
+	      sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
+		       CGEN_SYNTAX_CHAR(*syn), *str);
+	      return msg;
+	    }
+	  else
+	    {
+	      /* Ran out of input.  */
+	      static char msg [80];
+	      /* xgettext:c-format */
+	      sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
+		       CGEN_SYNTAX_CHAR(*syn));
+	      return msg;
+	    }
+	  continue;
+	}
+
+      /* We have an operand of some sort.  */
+      errmsg = openrisc_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
+					  &str, fields);
+      if (errmsg)
+	return errmsg;
+
+      /* Done with this operand, continue with next one.  */
+      ++ syn;
+    }
+
+  /* If we're at the end of the syntax string, we're done.  */
+  if (* syn == 0)
+    {
+      /* FIXME: For the moment we assume a valid `str' can only contain
+	 blanks now.  IE: We needn't try again with a longer version of
+	 the insn and it is assumed that longer versions of insns appear
+	 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
+      while (isspace (* str))
+	++ str;
+
+      if (* str != '\0')
+	return _("junk at end of line"); /* FIXME: would like to include `str' */
+
+      return NULL;
+    }
+
+  /* We couldn't parse it.  */
+  return _("unrecognized instruction");
+}
+
+/* Main entry point.
+   This routine is called for each instruction to be assembled.
+   STR points to the insn to be assembled.
+   We assume all necessary tables have been initialized.
+   The assembled instruction, less any fixups, is stored in BUF.
+   Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
+   still needs to be converted to target byte order, otherwise BUF is an array
+   of bytes in target byte order.
+   The result is a pointer to the insn's entry in the opcode table,
+   or NULL if an error occured (an error message will have already been
+   printed).
+
+   Note that when processing (non-alias) macro-insns,
+   this function recurses.
+
+   ??? It's possible to make this cpu-independent.
+   One would have to deal with a few minor things.
+   At this point in time doing so would be more of a curiosity than useful
+   [for example this file isn't _that_ big], but keeping the possibility in
+   mind helps keep the design clean.  */
+
+const CGEN_INSN *
+openrisc_cgen_assemble_insn (cd, str, fields, buf, errmsg)
+     CGEN_CPU_DESC cd;
+     const char *str;
+     CGEN_FIELDS *fields;
+     CGEN_INSN_BYTES_PTR buf;
+     char **errmsg;
+{
+  const char *start;
+  CGEN_INSN_LIST *ilist;
+  const char *parse_errmsg = NULL;
+  const char *insert_errmsg = NULL;
+
+  /* Skip leading white space.  */
+  while (isspace (* str))
+    ++ str;
+
+  /* The instructions are stored in hashed lists.
+     Get the first in the list.  */
+  ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
+
+  /* Keep looking until we find a match.  */
+
+  start = str;
+  for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
+    {
+      const CGEN_INSN *insn = ilist->insn;
+
+#ifdef CGEN_VALIDATE_INSN_SUPPORTED 
+      /* not usually needed as unsupported opcodes shouldn't be in the hash lists */
+      /* Is this insn supported by the selected cpu?  */
+      if (! openrisc_cgen_insn_supported (cd, insn))
+	continue;
+#endif
+
+      /* If the RELAX attribute is set, this is an insn that shouldn't be
+	 chosen immediately.  Instead, it is used during assembler/linker
+	 relaxation if possible.  */
+      if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
+	continue;
+
+      str = start;
+
+      /* Allow parse/insert handlers to obtain length of insn.  */
+      CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
+
+      parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
+      if (parse_errmsg != NULL)
+	continue;
+
+      /* ??? 0 is passed for `pc' */
+      insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
+						 (bfd_vma) 0);
+      if (insert_errmsg != NULL)
+        continue;
+
+      /* It is up to the caller to actually output the insn and any
+         queued relocs.  */
+      return insn;
+    }
+
+  {
+    static char errbuf[150];
+#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
+    const char *tmp_errmsg;
+
+    /* If requesting verbose error messages, use insert_errmsg.
+       Failing that, use parse_errmsg */
+    tmp_errmsg = (insert_errmsg ? insert_errmsg :
+		  parse_errmsg ? parse_errmsg :
+		  _("unrecognized instruction"));
+
+    if (strlen (start) > 50)
+      /* xgettext:c-format */
+      sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
+    else 
+      /* xgettext:c-format */
+      sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
+#else
+    if (strlen (start) > 50)
+      /* xgettext:c-format */
+      sprintf (errbuf, _("bad instruction `%.50s...'"), start);
+    else 
+      /* xgettext:c-format */
+      sprintf (errbuf, _("bad instruction `%.50s'"), start);
+#endif
+      
+    *errmsg = errbuf;
+    return NULL;
+  }
+}
+
+#if 0 /* This calls back to GAS which we can't do without care.  */
+
+/* Record each member of OPVALS in the assembler's symbol table.
+   This lets GAS parse registers for us.
+   ??? Interesting idea but not currently used.  */
+
+/* Record each member of OPVALS in the assembler's symbol table.
+   FIXME: Not currently used.  */
+
+void
+openrisc_cgen_asm_hash_keywords (cd, opvals)
+     CGEN_CPU_DESC cd;
+     CGEN_KEYWORD *opvals;
+{
+  CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
+  const CGEN_KEYWORD_ENTRY * ke;
+
+  while ((ke = cgen_keyword_search_next (& search)) != NULL)
+    {
+#if 0 /* Unnecessary, should be done in the search routine.  */
+      if (! openrisc_cgen_opval_supported (ke))
+	continue;
+#endif
+      cgen_asm_record_register (cd, ke->name, ke->value);
+    }
+}
+
+#endif /* 0 */