/* tc-sparc.c -- Assemble for the SPARC
   Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS 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.

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

#define cypress 1234

#include <stdio.h>
#include <ctype.h>

#include "as.h"
#include "subsegs.h"

/* careful, this file includes data *declarations* */
#include "opcode/sparc.h"

static void sparc_ip PARAMS ((char *));

static enum sparc_architecture current_architecture = v6;
static int architecture_requested;
static int warn_on_bump;

extern int target_big_endian;

const relax_typeS md_relax_table[1];

/* handle of the OPCODE hash table */
static struct hash_control *op_hash = NULL;

static void s_data1 PARAMS ((void));
static void s_seg PARAMS ((int));
static void s_proc PARAMS ((int));
static void s_reserve PARAMS ((int));
static void s_common PARAMS ((int));

const pseudo_typeS md_pseudo_table[] =
{
  {"align", s_align_bytes, 0},	/* Defaulting is invalid (0) */
  {"common", s_common, 0},
  {"global", s_globl, 0},
  {"half", cons, 2},
  {"optim", s_ignore, 0},
  {"proc", s_proc, 0},
  {"reserve", s_reserve, 0},
  {"seg", s_seg, 0},
  {"skip", s_space, 0},
  {"word", cons, 4},
#ifdef OBJ_ELF
  /* these are specific to sparc/svr4 */
  {"pushsection", obj_elf_section, 0},
  {"popsection", obj_elf_previous, 0},
  {"uaword", cons, 4},
  {"uahalf", cons, 2},
#endif
  {NULL, 0, 0},
};

const int md_short_jump_size = 4;
const int md_long_jump_size = 4;
const int md_reloc_size = 12;	/* Size of relocation record */

/* This array holds the chars that always start a comment.  If the
   pre-processor is disabled, these aren't very useful */
const char comment_chars[] = "!";	/* JF removed '|' from comment_chars */

/* This array holds the chars that only start a comment at the beginning of
   a line.  If the line seems to have the form '# 123 filename'
   .line and .file directives will appear in the pre-processed output */
/* Note that input_file.c hand checks for '#' at the beginning of the
   first line of the input file.  This is because the compiler outputs
   #NO_APP at the beginning of its output. */
/* Also note that comments started like this one will always
   work if '/' isn't otherwise defined. */
const char line_comment_chars[] = "#";

const char line_separator_chars[] = "";

/* Chars that can be used to separate mant from exp in floating point nums */
const char EXP_CHARS[] = "eE";

/* Chars that mean this number is a floating point constant */
/* As in 0f12.456 */
/* or    0d1.2345e12 */
const char FLT_CHARS[] = "rRsSfFdDxXpP";

/* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be
   changed in read.c.  Ideally it shouldn't have to know about it at all,
   but nothing is ideal around here.  */

static unsigned char octal[256];
#define isoctal(c)  octal[(unsigned char) (c)]
static unsigned char toHex[256];

struct sparc_it
  {
    char *error;
    unsigned long opcode;
    struct nlist *nlistp;
    expressionS exp;
    int pcrel;
    bfd_reloc_code_real_type reloc;
  };

struct sparc_it the_insn, set_insn;

static INLINE int
in_signed_range (val, max)
     bfd_signed_vma val, max;
{
  if (max <= 0)
    abort ();
  if (val > max)
    return 0;
  if (val < ~max)
    return 0;
  return 1;
}

#if 0
static void print_insn PARAMS ((struct sparc_it *insn));
#endif
static int getExpression PARAMS ((char *str));

static char *expr_end;
static int special_case;

/*
 * Instructions that require wierd handling because they're longer than
 * 4 bytes.
 */
#define	SPECIAL_CASE_SET	1
#define	SPECIAL_CASE_FDIV	2

/*
 * sort of like s_lcomm
 *
 */
#ifndef OBJ_ELF
static int max_alignment = 15;
#endif

static void
s_reserve (ignore)
     int ignore;
{
  char *name;
  char *p;
  char c;
  int align;
  int size;
  int temp;
  symbolS *symbolP;

  name = input_line_pointer;
  c = get_symbol_end ();
  p = input_line_pointer;
  *p = c;
  SKIP_WHITESPACE ();

  if (*input_line_pointer != ',')
    {
      as_bad ("Expected comma after name");
      ignore_rest_of_line ();
      return;
    }

  ++input_line_pointer;

  if ((size = get_absolute_expression ()) < 0)
    {
      as_bad ("BSS length (%d.) <0! Ignored.", size);
      ignore_rest_of_line ();
      return;
    }				/* bad length */

  *p = 0;
  symbolP = symbol_find_or_make (name);
  *p = c;

  if (strncmp (input_line_pointer, ",\"bss\"", 6) != 0
      && strncmp (input_line_pointer, ",\".bss\"", 7) != 0)
    {
      as_bad ("bad .reserve segment -- expected BSS segment", input_line_pointer);
      return;
    }

  if (input_line_pointer[2] == '.')
    input_line_pointer += 7;
  else
    input_line_pointer += 6;
  SKIP_WHITESPACE ();

  if (*input_line_pointer == ',')
    {
      ++input_line_pointer;

      SKIP_WHITESPACE ();
      if (*input_line_pointer == '\n')
	{
	  as_bad ("Missing alignment");
	  return;
	}

      align = get_absolute_expression ();
#ifndef OBJ_ELF
      if (align > max_alignment)
	{
	  align = max_alignment;
	  as_warn ("Alignment too large: %d. assumed.", align);
	}
#endif
      if (align < 0)
	{
	  align = 0;
	  as_warn ("Alignment negative. 0 assumed.");
	}

      record_alignment (bss_section, align);

      /* convert to a power of 2 alignment */
      for (temp = 0; (align & 1) == 0; align >>= 1, ++temp);;

      if (align != 1)
	{
	  as_bad ("Alignment not a power of 2");
	  ignore_rest_of_line ();
	  return;
	}			/* not a power of two */

      align = temp;
    }				/* if has optional alignment */
  else
    align = 0;

  if ((S_GET_SEGMENT (symbolP) == bss_section
       || !S_IS_DEFINED (symbolP))
#ifdef OBJ_AOUT
      && S_GET_OTHER (symbolP) == 0
      && S_GET_DESC (symbolP) == 0
#endif
      )
    {
      if (! need_pass_2)
	{
	  char *pfrag;
	  segT current_seg = now_seg;
	  subsegT current_subseg = now_subseg;

	  subseg_set (bss_section, 1); /* switch to bss */

	  if (align)
	    frag_align (align, 0); /* do alignment */

	  /* detach from old frag */
	  if (S_GET_SEGMENT(symbolP) == bss_section)
	    symbolP->sy_frag->fr_symbol = NULL;

	  symbolP->sy_frag = frag_now;
	  pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
			    size, (char *)0);
	  *pfrag = 0;

	  S_SET_SEGMENT (symbolP, bss_section);

	  subseg_set (current_seg, current_subseg);
	}
    }
  else
    {
      as_warn("Ignoring attempt to re-define symbol %s.", name);
    }				/* if not redefining */

  demand_empty_rest_of_line ();
}

static void
s_common (ignore)
     int ignore;
{
  char *name;
  char c;
  char *p;
  int temp, size;
  symbolS *symbolP;

  name = input_line_pointer;
  c = get_symbol_end ();
  /* just after name is now '\0' */
  p = input_line_pointer;
  *p = c;
  SKIP_WHITESPACE ();
  if (*input_line_pointer != ',')
    {
      as_bad ("Expected comma after symbol-name");
      ignore_rest_of_line ();
      return;
    }
  input_line_pointer++;		/* skip ',' */
  if ((temp = get_absolute_expression ()) < 0)
    {
      as_bad (".COMMon length (%d.) <0! Ignored.", temp);
      ignore_rest_of_line ();
      return;
    }
  size = temp;
  *p = 0;
  symbolP = symbol_find_or_make (name);
  *p = c;
  if (S_IS_DEFINED (symbolP))
    {
      as_bad ("Ignoring attempt to re-define symbol");
      ignore_rest_of_line ();
      return;
    }
  if (S_GET_VALUE (symbolP) != 0)
    {
      if (S_GET_VALUE (symbolP) != size)
	{
	  as_warn ("Length of .comm \"%s\" is already %ld. Not changed to %d.",
		   S_GET_NAME (symbolP), (long) S_GET_VALUE (symbolP), size);
	}
    }
  else
    {
#ifndef OBJ_ELF
      S_SET_VALUE (symbolP, (valueT) size);
      S_SET_EXTERNAL (symbolP);
#endif
    }
  know (symbolP->sy_frag == &zero_address_frag);
  if (*input_line_pointer != ',')
    {
      as_bad ("Expected comma after common length");
      ignore_rest_of_line ();
      return;
    }
  input_line_pointer++;
  SKIP_WHITESPACE ();
  if (*input_line_pointer != '"')
    {
      temp = get_absolute_expression ();
#ifndef OBJ_ELF
      if (temp > max_alignment)
	{
	  temp = max_alignment;
	  as_warn ("Common alignment too large: %d. assumed", temp);
	}
#endif
      if (temp < 0)
	{
	  temp = 0;
	  as_warn ("Common alignment negative; 0 assumed");
	}
#ifdef OBJ_ELF
      if (symbolP->local)
	{
	  segT old_sec;
	  int old_subsec;
	  char *p;
	  int align;

	allocate_bss:
	  old_sec = now_seg;
	  old_subsec = now_subseg;
	  align = temp;
	  record_alignment (bss_section, align);
	  subseg_set (bss_section, 0);
	  if (align)
	    frag_align (align, 0);
	  if (S_GET_SEGMENT (symbolP) == bss_section)
	    symbolP->sy_frag->fr_symbol = 0;
	  symbolP->sy_frag = frag_now;
	  p = frag_var (rs_org, 1, 1, (relax_substateT) 0, symbolP, size,
			(char *) 0);
	  *p = 0;
	  S_SET_SEGMENT (symbolP, bss_section);
	  S_CLEAR_EXTERNAL (symbolP);
	  subseg_set (old_sec, old_subsec);
	}
      else
#endif
	{
	allocate_common:
	  S_SET_VALUE (symbolP, (valueT) size);
	  S_SET_EXTERNAL (symbolP);
	  /* should be common, but this is how gas does it for now */
	  S_SET_SEGMENT (symbolP, &bfd_und_section);
	}
    }
  else
    {
      input_line_pointer++;
      /* @@ Some use the dot, some don't.  Can we get some consistency??  */
      if (*input_line_pointer == '.')
	input_line_pointer++;
      /* @@ Some say data, some say bss.  */
      if (strncmp (input_line_pointer, "bss\"", 4)
	  && strncmp (input_line_pointer, "data\"", 5))
	{
	  while (*--input_line_pointer != '"')
	    ;
	  input_line_pointer--;
	  goto bad_common_segment;
	}
      while (*input_line_pointer++ != '"')
	;
      goto allocate_common;
    }
  demand_empty_rest_of_line ();
  return;

  {
  bad_common_segment:
    p = input_line_pointer;
    while (*p && *p != '\n')
      p++;
    c = *p;
    *p = '\0';
    as_bad ("bad .common segment %s", input_line_pointer + 1);
    *p = c;
    input_line_pointer = p;
    ignore_rest_of_line ();
    return;
  }
}

static void
s_seg (ignore)
     int ignore;
{

  if (strncmp (input_line_pointer, "\"text\"", 6) == 0)
    {
      input_line_pointer += 6;
      s_text (0);
      return;
    }
  if (strncmp (input_line_pointer, "\"data\"", 6) == 0)
    {
      input_line_pointer += 6;
      s_data (0);
      return;
    }
  if (strncmp (input_line_pointer, "\"data1\"", 7) == 0)
    {
      input_line_pointer += 7;
      s_data1 ();
      return;
    }
  if (strncmp (input_line_pointer, "\"bss\"", 5) == 0)
    {
      input_line_pointer += 5;
      /* We only support 2 segments -- text and data -- for now, so
	 things in the "bss segment" will have to go into data for now.
	 You can still allocate SEG_BSS stuff with .lcomm or .reserve. */
      subseg_set (data_section, 255);	/* FIXME-SOMEDAY */
      return;
    }
  as_bad ("Unknown segment type");
  demand_empty_rest_of_line ();
}

static void
s_data1 ()
{
  subseg_set (data_section, 1);
  demand_empty_rest_of_line ();
}

static void
s_proc (ignore)
     int ignore;
{
  while (!is_end_of_line[(unsigned char) *input_line_pointer])
    {
      ++input_line_pointer;
    }
  ++input_line_pointer;
}


/* This function is called once, at assembler startup time.  It should
   set up all the tables, etc. that the MD part of the assembler will need. */
void
md_begin ()
{
  register const char *retval = NULL;
  int lose = 0;
  register unsigned int i = 0;

  op_hash = hash_new ();

  while (i < NUMOPCODES)
    {
      const char *name = sparc_opcodes[i].name;
      retval = hash_insert (op_hash, name, &sparc_opcodes[i]);
      if (retval != NULL)
	{
	  fprintf (stderr, "internal error: can't hash `%s': %s\n",
		   sparc_opcodes[i].name, retval);
	  lose = 1;
	}
      do
	{
	  if (sparc_opcodes[i].match & sparc_opcodes[i].lose)
	    {
	      fprintf (stderr, "internal error: losing opcode: `%s' \"%s\"\n",
		       sparc_opcodes[i].name, sparc_opcodes[i].args);
	      lose = 1;
	    }
	  ++i;
	}
      while (i < NUMOPCODES
	     && !strcmp (sparc_opcodes[i].name, name));
    }

  if (lose)
    as_fatal ("Broken assembler.  No assembly attempted.");

  for (i = '0'; i < '8'; ++i)
    octal[i] = 1;
  for (i = '0'; i <= '9'; ++i)
    toHex[i] = i - '0';
  for (i = 'a'; i <= 'f'; ++i)
    toHex[i] = i + 10 - 'a';
  for (i = 'A'; i <= 'F'; ++i)
    toHex[i] = i + 10 - 'A';


  target_big_endian = 1;
}

void
md_assemble (str)
     char *str;
{
  char *toP;
  int rsd;

  know (str);
  sparc_ip (str);

  /* See if "set" operand is absolute and small; skip sethi if so. */
  if (special_case == SPECIAL_CASE_SET
      && the_insn.exp.X_op == O_constant)
    {
      if (the_insn.exp.X_add_number >= -(1 << 12)
	  && the_insn.exp.X_add_number < (1 << 12))
	{
	  the_insn.opcode = 0x80102000	/* or %g0,imm,... */
	    | (the_insn.opcode & 0x3E000000)	/* dest reg */
	    | (the_insn.exp.X_add_number & 0x1FFF);	/* imm */
	  special_case = 0;	/* No longer special */
	  the_insn.reloc = BFD_RELOC_NONE;	/* No longer relocated */
	}
    }

  toP = frag_more (4);
  /* put out the opcode */
  md_number_to_chars (toP, (valueT) the_insn.opcode, 4);

  /* put out the symbol-dependent stuff */
  if (the_insn.reloc != BFD_RELOC_NONE)
    {
      fix_new_exp (frag_now,	/* which frag */
		   (toP - frag_now->fr_literal),	/* where */
		   4,		/* size */
		   &the_insn.exp,
		   the_insn.pcrel,
		   the_insn.reloc);
    }

  switch (special_case)
    {
    case SPECIAL_CASE_SET:
      special_case = 0;
      assert (the_insn.reloc == BFD_RELOC_HI22);
      /* See if "set" operand has no low-order bits; skip OR if so. */
      if (the_insn.exp.X_op == O_constant
	  && ((the_insn.exp.X_add_number & 0x3FF) == 0))
	return;
      toP = frag_more (4);
      rsd = (the_insn.opcode >> 25) & 0x1f;
      the_insn.opcode = 0x80102000 | (rsd << 25) | (rsd << 14);
      md_number_to_chars (toP, (valueT) the_insn.opcode, 4);
      fix_new_exp (frag_now,	/* which frag */
		   (toP - frag_now->fr_literal),	/* where */
		   4,		/* size */
		   &the_insn.exp,
		   the_insn.pcrel,
		   BFD_RELOC_LO10);
      return;

    case SPECIAL_CASE_FDIV:
      /* According to information leaked from Sun, the "fdiv" instructions
	 on early SPARC machines would produce incorrect results sometimes.
	 The workaround is to add an fmovs of the destination register to
	 itself just after the instruction.  This was true on machines
	 with Weitek 1165 float chips, such as the Sun-4/260 and /280. */
      special_case = 0;
      assert (the_insn.reloc == BFD_RELOC_NONE);
      toP = frag_more (4);
      rsd = (the_insn.opcode >> 25) & 0x1f;
      the_insn.opcode = 0x81A00020 | (rsd << 25) | rsd;	/* fmovs dest,dest */
      md_number_to_chars (toP, (valueT) the_insn.opcode, 4);
      return;

    case 0:
      return;

    default:
      as_fatal ("failed sanity check.");
    }
}

static void
sparc_ip (str)
     char *str;
{
  char *error_message = "";
  char *s;
  const char *args;
  char c;
  struct sparc_opcode *insn;
  char *argsStart;
  unsigned long opcode;
  unsigned int mask = 0;
  int match = 0;
  int comma = 0;
  long immediate_max = 0;

  for (s = str; islower (*s) || (*s >= '0' && *s <= '3'); ++s)
    ;
  switch (*s)
    {

    case '\0':
      break;

    case ',':
      comma = 1;

      /*FALLTHROUGH */

    case ' ':
      *s++ = '\0';
      break;

    default:
      as_bad ("Unknown opcode: `%s'", str);
      exit (1);
    }
  if ((insn = (struct sparc_opcode *) hash_find (op_hash, str)) == NULL)
    {
      as_bad ("Unknown opcode: `%s'", str);
      return;
    }
  if (comma)
    {
      *--s = ',';
    }
  argsStart = s;
  for (;;)
    {
      opcode = insn->match;
      memset (&the_insn, '\0', sizeof (the_insn));
      the_insn.reloc = BFD_RELOC_NONE;

      /*
       * Build the opcode, checking as we go to make
       * sure that the operands match
       */
      for (args = insn->args;; ++args)
	{
	  switch (*args)
	    {


	    case 'M':
	    case 'm':
	      if (strncmp (s, "%asr", 4) == 0)
		{
		  s += 4;

		  if (isdigit (*s))
		    {
		      long num = 0;

		      while (isdigit (*s))
			{
			  num = num * 10 + *s - '0';
			  ++s;
			}

		      if (num < 16 || 31 < num)
			{
			  error_message = ": asr number must be between 15 and 31";
			  goto error;
			}	/* out of range */

		      opcode |= (*args == 'M' ? RS1 (num) : RD (num));
		      continue;
		    }
		  else
		    {
		      error_message = ": expecting %asrN";
		      goto error;
		    }		/* if %asr followed by a number. */

		}		/* if %asr */
	      break;


	    case '\0':		/* end of args */
	      if (*s == '\0')
		{
		  match = 1;
		}
	      break;

	    case '+':
	      if (*s == '+')
		{
		  ++s;
		  continue;
		}
	      if (*s == '-')
		{
		  continue;
		}
	      break;

	    case '[':		/* these must match exactly */
	    case ']':
	    case ',':
	    case ' ':
	      if (*s++ == *args)
		continue;
	      break;

	    case '#':		/* must be at least one digit */
	      if (isdigit (*s++))
		{
		  while (isdigit (*s))
		    {
		      ++s;
		    }
		  continue;
		}
	      break;

	    case 'C':		/* coprocessor state register */
	      if (strncmp (s, "%csr", 4) == 0)
		{
		  s += 4;
		  continue;
		}
	      break;

	    case 'b':		/* next operand is a coprocessor register */
	    case 'c':
	    case 'D':
	      if (*s++ == '%' && *s++ == 'c' && isdigit (*s))
		{
		  mask = *s++;
		  if (isdigit (*s))
		    {
		      mask = 10 * (mask - '0') + (*s++ - '0');
		      if (mask >= 32)
			{
			  break;
			}
		    }
		  else
		    {
		      mask -= '0';
		    }
		  switch (*args)
		    {

		    case 'b':
		      opcode |= mask << 14;
		      continue;

		    case 'c':
		      opcode |= mask;
		      continue;

		    case 'D':
		      opcode |= mask << 25;
		      continue;
		    }
		}
	      break;

	    case 'r':		/* next operand must be a register */
	    case '1':
	    case '2':
	    case 'd':
	      if (*s++ == '%')
		{
		  switch (c = *s++)
		    {

		    case 'f':	/* frame pointer */
		      if (*s++ == 'p')
			{
			  mask = 0x1e;
			  break;
			}
		      goto error;

		    case 'g':	/* global register */
		      if (isoctal (c = *s++))
			{
			  mask = c - '0';
			  break;
			}
		      goto error;

		    case 'i':	/* in register */
		      if (isoctal (c = *s++))
			{
			  mask = c - '0' + 24;
			  break;
			}
		      goto error;

		    case 'l':	/* local register */
		      if (isoctal (c = *s++))
			{
			  mask = (c - '0' + 16);
			  break;
			}
		      goto error;

		    case 'o':	/* out register */
		      if (isoctal (c = *s++))
			{
			  mask = (c - '0' + 8);
			  break;
			}
		      goto error;

		    case 's':	/* stack pointer */
		      if (*s++ == 'p')
			{
			  mask = 0xe;
			  break;
			}
		      goto error;

		    case 'r':	/* any register */
		      if (!isdigit (c = *s++))
			{
			  goto error;
			}
		      /* FALLTHROUGH */
		    case '0':
		    case '1':
		    case '2':
		    case '3':
		    case '4':
		    case '5':
		    case '6':
		    case '7':
		    case '8':
		    case '9':
		      if (isdigit (*s))
			{
			  if ((c = 10 * (c - '0') + (*s++ - '0')) >= 32)
			    {
			      goto error;
			    }
			}
		      else
			{
			  c -= '0';
			}
		      mask = c;
		      break;

		    default:
		      goto error;
		    }
		  /*
					 * Got the register, now figure out where
					 * it goes in the opcode.
					 */
		  switch (*args)
		    {

		    case '1':
		      opcode |= mask << 14;
		      continue;

		    case '2':
		      opcode |= mask;
		      continue;

		    case 'd':
		      opcode |= mask << 25;
		      continue;

		    case 'r':
		      opcode |= (mask << 25) | (mask << 14);
		      continue;
		    }
		}
	      break;

	    case 'e':		/* next operand is a floating point register */
	    case 'v':
	    case 'V':

	    case 'f':
	    case 'B':
	    case 'R':

	    case 'g':
	    case 'H':
	    case 'J':
	      {
		char format;

		if (*s++ == '%'
		    && ((format = *s) == 'f')
		    && isdigit (*++s))
		  {
		    for (mask = 0; isdigit (*s); ++s)
		      {
			mask = 10 * mask + (*s - '0');
		      }		/* read the number */

		    if ((*args == 'v'
			 || *args == 'B'
			 || *args == 'H')
			&& (mask & 1))
		      {
			break;
		      }		/* register must be even numbered */

		    if ((*args == 'V'
			 || *args == 'R'
			 || *args == 'J')
			&& (mask & 3))
		      {
			break;
		      }		/* register must be multiple of 4 */

		    if (mask >= 32)
		      {
			error_message = ": There are only 32 f registers; [0-31]";
			goto error;
		      }	/* on error */
		  }
		else
		  {
		    break;
		  }	/* if not an 'f' register. */

		switch (*args)
		  {

		  case 'v':
		  case 'V':
		  case 'e':
		    opcode |= RS1 (mask);
		    continue;


		  case 'f':
		  case 'B':
		  case 'R':
		    opcode |= RS2 (mask);
		    continue;

		  case 'g':
		  case 'H':
		  case 'J':
		    opcode |= RD (mask);
		    continue;
		  }		/* pack it in. */

		know (0);
		break;
	      }			/* float arg */

	    case 'F':
	      if (strncmp (s, "%fsr", 4) == 0)
		{
		  s += 4;
		  continue;
		}
	      break;

	    case 'h':		/* high 22 bits */
	      the_insn.reloc = BFD_RELOC_HI22;
	      goto immediate;

	    case 'l':		/* 22 bit PC relative immediate */
	      the_insn.reloc = BFD_RELOC_SPARC_WDISP22;
	      the_insn.pcrel = 1;
	      goto immediate;

	    case 'L':		/* 30 bit immediate */
	      the_insn.reloc = BFD_RELOC_32_PCREL_S2;
	      the_insn.pcrel = 1;
	      goto immediate;

	    case 'n':		/* 22 bit immediate */
	      the_insn.reloc = BFD_RELOC_SPARC22;
	      goto immediate;

	    case 'i':		/* 13 bit immediate */
	      the_insn.reloc = BFD_RELOC_SPARC13;
	      immediate_max = 0x0FFF;

	      /*FALLTHROUGH */

	    immediate:
	      if (*s == ' ')
		s++;
	      if (*s == '%')
		{
		  if ((c = s[1]) == 'h' && s[2] == 'i')
		    {
		      the_insn.reloc = BFD_RELOC_HI22;
		      s += 3;
		    }
		  else if (c == 'l' && s[2] == 'o')
		    {
		      the_insn.reloc = BFD_RELOC_LO10;
		      s += 3;
		    }
		  else
		    break;
		}
	      /* Note that if the getExpression() fails, we will still
		 have created U entries in the symbol table for the
		 'symbols' in the input string.  Try not to create U
		 symbols for registers, etc.  */
	      {
		/* This stuff checks to see if the expression ends in
		   +%reg.  If it does, it removes the register from
		   the expression, and re-sets 's' to point to the
		   right place.  */

		char *s1;

		for (s1 = s; *s1 && *s1 != ',' && *s1 != ']'; s1++);;

		if (s1 != s && isdigit (s1[-1]))
		  {
		    if (s1[-2] == '%' && s1[-3] == '+')
		      {
			s1 -= 3;
			*s1 = '\0';
			(void) getExpression (s);
			*s1 = '+';
			s = s1;
			continue;
		      }
		    else if (strchr ("goli0123456789", s1[-2]) && s1[-3] == '%' && s1[-4] == '+')
		      {
			s1 -= 4;
			*s1 = '\0';
			(void) getExpression (s);
			*s1 = '+';
			s = s1;
			continue;
		      }
		  }
	      }
	      (void) getExpression (s);
	      s = expr_end;

	      if (the_insn.exp.X_op == O_constant
		  && the_insn.exp.X_add_symbol == 0
		  && the_insn.exp.X_op_symbol == 0)
		{
		  /* For pc-relative call instructions, we reject
		     constants to get better code.  */
		  if (the_insn.pcrel
		      && the_insn.reloc == BFD_RELOC_32_PCREL_S2
		      && in_signed_range (the_insn.exp.X_add_number, 0x3fff)
		      )
		    {
		      error_message = ": PC-relative operand can't be a constant";
		      goto error;
		    }
		  /* Check for invalid constant values.  Don't warn if
		     constant was inside %hi or %lo, since these
		     truncate the constant to fit.  */
		  if (immediate_max != 0
		      && the_insn.reloc != BFD_RELOC_LO10
		      && the_insn.reloc != BFD_RELOC_HI22
		      && !in_signed_range (the_insn.exp.X_add_number,
					   immediate_max)
		      )
		    {
		      if (the_insn.pcrel)
			/* Who knows?  After relocation, we may be within
			   range.  Let the linker figure it out.  */
			{
			  the_insn.exp.X_op = O_symbol;
			  the_insn.exp.X_add_symbol = section_symbol (absolute_section);
			}
		      else
			/* Immediate value is non-pcrel, and out of
                           range.  */
			as_bad ("constant value %ld out of range (%ld .. %ld)",
				the_insn.exp.X_add_number,
				~immediate_max, immediate_max);
		    }
		}

	      /* Reset to prevent extraneous range check.  */
	      immediate_max = 0;

	      continue;

	    case 'a':
	      if (*s++ == 'a')
		{
		  opcode |= ANNUL;
		  continue;
		}
	      break;

	    case 'A':
	      {
		char *push = input_line_pointer;
		expressionS e;

		input_line_pointer = s;

		expression (&e);
		if (e.X_op == O_constant)
		  {
		    opcode |= e.X_add_number << 5;
		    s = input_line_pointer;
		    input_line_pointer = push;
		    continue;
		  }		/* if absolute */

		break;
	      }			/* alternate space */

	    case 'p':
	      if (strncmp (s, "%psr", 4) == 0)
		{
		  s += 4;
		  continue;
		}
	      break;

	    case 'q':		/* floating point queue */
	      if (strncmp (s, "%fq", 3) == 0)
		{
		  s += 3;
		  continue;
		}
	      break;

	    case 'Q':		/* coprocessor queue */
	      if (strncmp (s, "%cq", 3) == 0)
		{
		  s += 3;
		  continue;
		}
	      break;

	    case 'S':
	      if (strcmp (str, "set") == 0)
		{
		  special_case = SPECIAL_CASE_SET;
		  continue;
		}
	      else if (strncmp (str, "fdiv", 4) == 0)
		{
		  special_case = SPECIAL_CASE_FDIV;
		  continue;
		}
	      break;


	    case 't':
	      if (strncmp (s, "%tbr", 4) != 0)
		break;
	      s += 4;
	      continue;

	    case 'w':
	      if (strncmp (s, "%wim", 4) != 0)
		break;
	      s += 4;
	      continue;

	    case 'y':
	      if (strncmp (s, "%y", 2) != 0)
		break;
	      s += 2;
	      continue;

	    default:
	      as_fatal ("failed sanity check.");
	    }			/* switch on arg code */
	  break;
	}			/* for each arg that we expect */
    error:
      if (match == 0)
	{
	  /* Args don't match. */
	  if (((unsigned) (&insn[1] - sparc_opcodes)) < NUMOPCODES
	      && !strcmp (insn->name, insn[1].name))
	    {
	      ++insn;
	      s = argsStart;
	      continue;
	    }
	  else
	    {
	      as_bad ("Illegal operands%s", error_message);
	      return;
	    }
	}
      else
	{
	  if (insn->architecture > current_architecture)
	    {
	      if ((!architecture_requested || warn_on_bump)
		  &&
		  1
		)
		{
		  if (warn_on_bump)
		    {
		      as_warn ("architecture bumped from \"%s\" to \"%s\" on \"%s\"",
			       architecture_pname[current_architecture],
			       architecture_pname[insn->architecture],
			       str);
		    }		/* if warning */

		  current_architecture = insn->architecture;
		}
	      else
		{
		  as_bad ("architecture mismatch on \"%s\" (\"%s\").  current architecture is \"%s\"",
			  str,
			  architecture_pname[insn->architecture],
			  architecture_pname[current_architecture]);
		  return;
		}		/* if bump ok else error */
	    }			/* if architecture higher */
	}			/* if no match */

      break;
    }				/* forever looking for a match */

  the_insn.opcode = opcode;
}

static int
getExpression (str)
     char *str;
{
  char *save_in;
  segT seg;

  save_in = input_line_pointer;
  input_line_pointer = str;
  seg = expression (&the_insn.exp);
  if (seg != absolute_section
      && seg != text_section
      && seg != data_section
      && seg != bss_section
      && seg != undefined_section)
    {
      the_insn.error = "bad segment";
      expr_end = input_line_pointer;
      input_line_pointer = save_in;
      return 1;
    }
  expr_end = input_line_pointer;
  input_line_pointer = save_in;
  return 0;
}				/* getExpression() */


/*
  This is identical to the md_atof in m68k.c.  I think this is right,
  but I'm not sure.

  Turn a string in input_line_pointer into a floating point constant of type
  type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
  emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
  */

/* Equal to MAX_PRECISION in atof-ieee.c */
#define MAX_LITTLENUMS 6

char *
md_atof (type, litP, sizeP)
     char type;
     char *litP;
     int *sizeP;
{
  int prec;
  LITTLENUM_TYPE words[MAX_LITTLENUMS];
  LITTLENUM_TYPE *wordP;
  char *t;
  char *atof_ieee ();

  switch (type)
    {

    case 'f':
    case 'F':
    case 's':
    case 'S':
      prec = 2;
      break;

    case 'd':
    case 'D':
    case 'r':
    case 'R':
      prec = 4;
      break;

    case 'x':
    case 'X':
      prec = 6;
      break;

    case 'p':
    case 'P':
      prec = 6;
      break;

    default:
      *sizeP = 0;
      return "Bad call to MD_ATOF()";
    }
  t = atof_ieee (input_line_pointer, type, words);
  if (t)
    input_line_pointer = t;
  *sizeP = prec * sizeof (LITTLENUM_TYPE);
  for (wordP = words; prec--;)
    {
      md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
      litP += sizeof (LITTLENUM_TYPE);
    }
  return 0;
}

/*
 * Write out big-endian.
 */
void
md_number_to_chars (buf, val, n)
     char *buf;
     valueT val;
     int n;
{
  number_to_chars_bigendian (buf, val, n);
}

/* Apply a fixS to the frags, now that we know the value it ought to
   hold. */

int
md_apply_fix (fixP, value)
     fixS *fixP;
     valueT *value;
{
  char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
  offsetT val;

  val = *value;

  assert (fixP->fx_r_type < BFD_RELOC_UNUSED);

  fixP->fx_addnumber = val;	/* Remember value for emit_reloc */

#ifdef OBJ_ELF
  /* FIXME: SPARC ELF relocations don't use an addend in the data
     field itself.  This whole approach should be somehow combined
     with the calls to bfd_perform_relocation.  */
  if (fixP->fx_addsy != NULL)
    return 1;
#endif

  /* This is a hack.  There should be a better way to
     handle this.  Probably in terms of howto fields, once
     we can look at these fixups in terms of howtos.  */
  if (fixP->fx_r_type == BFD_RELOC_32_PCREL_S2 && fixP->fx_addsy)
    val += fixP->fx_where + fixP->fx_frag->fr_address;

  switch (fixP->fx_r_type)
    {
    case BFD_RELOC_16:
      buf[0] = val >> 8;
      buf[1] = val;
      break;

    case BFD_RELOC_32:
      buf[0] = val >> 24;
      buf[1] = val >> 16;
      buf[2] = val >> 8;
      buf[3] = val;
      break;

    case BFD_RELOC_32_PCREL_S2:
      val = (val >>= 2) + 1;
      buf[0] |= (val >> 24) & 0x3f;
      buf[1] = (val >> 16);
      buf[2] = val >> 8;
      buf[3] = val;
      break;


    case BFD_RELOC_HI22:
      if (!fixP->fx_addsy)
	{
	  buf[1] |= (val >> 26) & 0x3f;
	  buf[2] = val >> 18;
	  buf[3] = val >> 10;
	}
      else
	{
	  buf[2] = 0;
	  buf[3] = 0;
	}
      break;

    case BFD_RELOC_SPARC22:
      if (val & ~0x003fffff)
	{
	  as_bad ("relocation overflow");
	}			/* on overflow */
      buf[1] |= (val >> 16) & 0x3f;
      buf[2] = val >> 8;
      buf[3] = val & 0xff;
      break;


    case BFD_RELOC_LO10:
      if (!fixP->fx_addsy)
	{
	  buf[2] |= (val >> 8) & 0x03;
	  buf[3] = val;
	}
      else
	buf[3] = 0;
      break;

    case BFD_RELOC_SPARC13:
      if (! in_signed_range (val, 0x1fff))
	as_bad ("relocation overflow");

      buf[2] |= (val >> 8) & 0x1f;
      buf[3] = val;
      break;

    case BFD_RELOC_SPARC_WDISP22:
      val = (val >>= 2) + 1;
      /* FALLTHROUGH */
    case BFD_RELOC_SPARC_BASE22:
      buf[1] |= (val >> 16) & 0x3f;
      buf[2] = val >> 8;
      buf[3] = val;
      break;

    case BFD_RELOC_NONE:
    default:
      as_bad ("bad or unhandled relocation type: 0x%02x", fixP->fx_r_type);
      break;
    }

  /* Are we finished with this relocation now?  */
  if (fixP->fx_addsy == 0 && !fixP->fx_pcrel)
    fixP->fx_done = 1;

  return 1;
}

/* Translate internal representation of relocation info to BFD target
   format.  */
arelent *
tc_gen_reloc (section, fixp)
     asection *section;
     fixS *fixp;
{
  arelent *reloc;
  bfd_reloc_code_real_type code;

  reloc = (arelent *) bfd_alloc_by_size_t (stdoutput, sizeof (arelent));
  assert (reloc != 0);

  reloc->sym_ptr_ptr = &fixp->fx_addsy->bsym;
  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;

  switch (fixp->fx_r_type)
    {
    case BFD_RELOC_16:
    case BFD_RELOC_32:
    case BFD_RELOC_HI22:
    case BFD_RELOC_LO10:
    case BFD_RELOC_32_PCREL_S2:
    case BFD_RELOC_SPARC13:
    case BFD_RELOC_SPARC_BASE13:
    case BFD_RELOC_SPARC_WDISP22:
      code = fixp->fx_r_type;
      break;
    default:
      abort ();
    }
  reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
  if (reloc->howto == 0)
    {
      as_bad_where (fixp->fx_file, fixp->fx_line,
		    "internal error: can't export reloc type %d",
		    fixp->fx_r_type);
      return 0;
    }
  assert (!fixp->fx_pcrel == !reloc->howto->pc_relative);

  /* @@ Why fx_addnumber sometimes and fx_offset other times?  */
  if (reloc->howto->pc_relative == 0)
    reloc->addend = fixp->fx_addnumber;
#if defined (OBJ_ELF) || defined (OBJ_COFF)
  else if ((fixp->fx_addsy->bsym->flags & BSF_SECTION_SYM) != 0)
    reloc->addend = (section->vma
		     + fixp->fx_addnumber
		     + md_pcrel_from (fixp));
#endif
  else
    reloc->addend = fixp->fx_offset - reloc->address;

  return reloc;
}


#if 0
/* for debugging only */
static void
print_insn (insn)
     struct sparc_it *insn;
{
  const char *const Reloc[] = {
    "RELOC_8",
    "RELOC_16",
    "RELOC_32",
    "RELOC_DISP8",
    "RELOC_DISP16",
    "RELOC_DISP32",
    "RELOC_WDISP30",
    "RELOC_WDISP22",
    "RELOC_HI22",
    "RELOC_22",
    "RELOC_13",
    "RELOC_LO10",
    "RELOC_SFA_BASE",
    "RELOC_SFA_OFF13",
    "RELOC_BASE10",
    "RELOC_BASE13",
    "RELOC_BASE22",
    "RELOC_PC10",
    "RELOC_PC22",
    "RELOC_JMP_TBL",
    "RELOC_SEGOFF16",
    "RELOC_GLOB_DAT",
    "RELOC_JMP_SLOT",
    "RELOC_RELATIVE",
    "NO_RELOC"
  };

  if (insn->error)
    fprintf (stderr, "ERROR: %s\n");
  fprintf (stderr, "opcode=0x%08x\n", insn->opcode);
  fprintf (stderr, "reloc = %s\n", Reloc[insn->reloc]);
  fprintf (stderr, "exp = {\n");
  fprintf (stderr, "\t\tX_add_symbol = %s\n",
	   ((insn->exp.X_add_symbol != NULL)
	    ? ((S_GET_NAME (insn->exp.X_add_symbol) != NULL)
	       ? S_GET_NAME (insn->exp.X_add_symbol)
	       : "???")
	    : "0"));
  fprintf (stderr, "\t\tX_sub_symbol = %s\n",
	   ((insn->exp.X_op_symbol != NULL)
	    ? (S_GET_NAME (insn->exp.X_op_symbol)
	       ? S_GET_NAME (insn->exp.X_op_symbol)
	       : "???")
	    : "0"));
  fprintf (stderr, "\t\tX_add_number = %d\n",
	   insn->exp.X_add_number);
  fprintf (stderr, "}\n");
}
#endif

/*
 * md_parse_option
 *	Invocation line includes a switch not recognized by the base assembler.
 *	See if it's a processor-specific option.  These are:
 *
 *	-bump
 *		Warn on architecture bumps.  See also -A.
 *
 *	-Av6, -Av7, -Av8, -Asparclite
 *		Select the architecture.  Instructions or features not
 *		supported by the selected architecture cause fatal errors.
 *
 *		The default is to start at v6, and bump the architecture up
 *		whenever an instruction is seen at a higher level.
 *
 *		If -bump is specified, a warning is printing when bumping to
 *		higher levels.
 *
 *		If an architecture is specified, all instructions must match
 *		that architecture.  Any higher level instructions are flagged
 *		as errors.
 *
 *		if both an architecture and -bump are specified, the
 *		architecture starts at the specified level, but bumps are
 *		warnings.
 *
 */

int 
md_parse_option (argP, cntP, vecP)
     char **argP;
     int *cntP;
     char ***vecP;
{
  char *p;
  const char **arch;

  if (!strcmp (*argP, "bump"))
    {
      warn_on_bump = 1;
    }
  else if (**argP == 'A')
    {
      p = (*argP) + 1;

      for (arch = architecture_pname; *arch != NULL; ++arch)
	{
	  if (strcmp (p, *arch) == 0)
	    {
	      break;
	    }			/* found a match */
	}			/* walk the pname table */

      if (*arch == NULL)
	{
	  as_bad ("unknown architecture: %s", p);
	}
      else
	{
	  current_architecture = (enum sparc_architecture) (arch - architecture_pname);
	  architecture_requested = 1;
	}
    }
#ifdef OBJ_ELF
  else if (**argP == 'V')
    {
      print_version_id ();
    }
  else if (**argP == 'Q')
    {
      /* Qy - do emit .comment
	 Qn - do not emit .comment */
    }
  else if (**argP == 's')
    {
      /* use .stab instead of .stab.excl */
    }
  else if (**argP == 'q')
    {
      /* quick -- native assembler does fewer checks */
    }
#endif
  else if (strcmp (*argP, "sparc") == 0)
    {
      /* Ignore -sparc, used by SunOS make default .s.o rule.  */
    }
  else
    {
      /* Unknown option */
      (*argP)++;
      return 0;
    }
  **argP = '\0';		/* Done parsing this switch */
  return 1;
}				/* md_parse_option() */

/* We have no need to default values of symbols. */

/* ARGSUSED */
symbolS *
md_undefined_symbol (name)
     char *name;
{
  return 0;
}				/* md_undefined_symbol() */

/* Parse an operand that is machine-specific.
   We just return without modifying the expression if we have nothing
   to do. */

/* ARGSUSED */
void 
md_operand (expressionP)
     expressionS *expressionP;
{
}

/* Round up a section size to the appropriate boundary. */
valueT
md_section_align (segment, size)
     segT segment;
     valueT size;
{
#ifndef OBJ_ELF
  /* This is not right for ELF; a.out wants it, and COFF will force
     the alignment anyways.  */
  valueT align = (valueT) 1 << (valueT) (stdoutput->xvec->align_power_min);
  valueT newsize;
  /* turn alignment value into a mask */
  align--;
  newsize = (size + align) & ~align;
  return newsize;
#else
  return size;
#endif
}

/* Exactly what point is a PC-relative offset relative TO?
   On the sparc, they're relative to the address of the offset, plus
   its size.  This gets us to the following instruction.
   (??? Is this right?  FIXME-SOON) */
long 
md_pcrel_from (fixP)
     fixS *fixP;
{
  return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
}

/* end of tc-sparc.c */
