freebsd-dev/gnu/usr.bin/as/config/tc-sparc.c

/* 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. */

#ifndef lint
static char rcsid[] = "$Id$";
#endif

#define cypress 1234

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

#include "as.h"

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

#define DEBUG_SPARC 1
void md_begin();
void md_end();
void md_number_to_chars();
void md_assemble();
char *md_atof();
void md_convert_frag();
void md_create_short_jump();
void md_create_long_jump();
int md_estimate_size_before_relax();
void md_ri_to_chars();
symbolS *md_undefined_symbol();
static void sparc_ip();

static enum sparc_architecture current_architecture = v6;
static int architecture_requested = 0;
static int warn_on_bump = 0;

const relax_typeS md_relax_table[] = {
	0 };

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

static void s_seg(), s_proc(), s_data1(), s_reserve(), s_common(), s_empty();
extern void s_globl(), s_long(), s_short(), s_space(), cons();
extern void s_align_bytes(), s_ignore();

const pseudo_typeS md_pseudo_table[] = {
	{ "align",	s_align_bytes,	0 },    /* Defaulting is invalid (0) */
	{ "empty",	s_empty,	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 },
	{ 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[] = "#";

/* 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[c]
    static unsigned char toHex[256];

struct sparc_it {
	char *error;
	unsigned long opcode;
	struct nlist *nlistp;
	expressionS exp;
	int pcrel;
	enum reloc_type reloc;
} the_insn, set_insn;

#if __STDC__ == 1
#if DEBUG_SPARC
static void print_insn(struct sparc_it *insn);
#endif
static int getExpression(char *str);
#else /* not __STDC__ */
#if DEBUG_SPARC
static void print_insn();
#endif
static int getExpression();
#endif /* not __STDC__ */

static char *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"
};

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
 *
 */
static int max_alignment = 15;

static void s_reserve() {
	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) {
		as_bad("bad .reserve segment: `%s'", input_line_pointer);
		return;
	} /* if not bss */

	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();
		if (align > max_alignment){
			align = max_alignment;
			as_warn("Alignment too large: %d. assumed.", align);
		} else if (align < 0) {
			align = 0;
			as_warn("Alignment negative. 0 assumed.");
		}
#ifdef MANY_SEGMENTS
#define SEG_BSS SEG_E2
		record_alignment(SEG_E2, align);
#else
		record_alignment(SEG_BSS, align);
#endif

		/* 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;

		/* Align */
		align = ~((~0) << align);	/* Convert to a mask */
		local_bss_counter = (local_bss_counter + align) & (~align);
	} /* if has optional alignment */

	if (S_GET_OTHER(symbolP) == 0
	    && S_GET_DESC(symbolP) == 0
	    && ((S_GET_SEGMENT(symbolP) == SEG_BSS
		 && S_GET_VALUE(symbolP) == local_bss_counter)
		|| !S_IS_DEFINED(symbolP))) {
		S_SET_VALUE(symbolP, local_bss_counter);
		S_SET_SEGMENT(symbolP, SEG_BSS);
		symbolP->sy_frag  = &bss_address_frag;
		local_bss_counter += size;
	} else {
		as_warn("Ignoring attempt to re-define symbol from %d. to %d.",
			S_GET_VALUE(symbolP), local_bss_counter);
	} /* if not redefining */

	demand_empty_rest_of_line();
	return;
} /* s_reserve() */

static void s_common() {
	register char *name;
	register char c;
	register char *p;
	register int temp;
	register 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;
	}
	*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) != temp) {
			as_warn("Length of .comm \"%s\" is already %d. Not changed to %d.",
				S_GET_NAME(symbolP), S_GET_VALUE(symbolP), temp);
		}
	} else {
		S_SET_VALUE(symbolP, temp);
		S_SET_EXTERNAL(symbolP);
	}
	know(symbolP->sy_frag == &zero_address_frag);
	if (strncmp(input_line_pointer, ",\"bss\"", 6) != 0
	    && strncmp(input_line_pointer, ",\"data\"", 7) != 0) {
		p=input_line_pointer;
		while (*p && *p != '\n')
		    p++;
		c= *p;
		*p='\0';
		as_bad("bad .common segment: `%s'", input_line_pointer);
		*p=c;
		return;
	}
	input_line_pointer += 6 + (input_line_pointer[2] == 'd'); /* Skip either */
	demand_empty_rest_of_line();
	return;
} /* s_common() */

static void s_seg() {

	if (strncmp(input_line_pointer, "\"text\"", 6) == 0) {
		input_line_pointer += 6;
		s_text();
		return;
	}
	if (strncmp(input_line_pointer, "\"data\"", 6) == 0) {
		input_line_pointer += 6;
		s_data();
		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_new(SEG_DATA, 255);	/* FIXME-SOMEDAY */
		return;
	}
	as_bad("Unknown segment type");
	demand_empty_rest_of_line();
	return;
} /* s_seg() */

static void s_data1() {
	subseg_new(SEG_DATA, 1);
	demand_empty_rest_of_line();
	return;
} /* s_data1() */

static void s_proc() {
	extern char is_end_of_line[];

	while (!is_end_of_line[*input_line_pointer]) {
		++input_line_pointer;
	}
	++input_line_pointer;
	return;
} /* s_proc() */

/*
 * GI: This is needed for compatability with Sun's assembler - which
 * otherwise generates a warning when certain "suspect" instructions
 * appear in the delay slot of a branch.  And more seriously without
 * this directive in certain cases Sun's assembler will rearrange
 * code thinking it knows how to alter things when it doesn't.
 */
static void
s_empty()
{
	demand_empty_rest_of_line();
	return;
} /* s_empty() */

/* 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 char *retval = NULL;
	int lose = 0;
	register unsigned int i = 0;

	op_hash = hash_new();
	if (op_hash == NULL)
	    as_fatal("Virtual memory exhausted");

	while (i < NUMOPCODES) {
		const char *name = sparc_opcodes[i].name;
		retval = hash_insert(op_hash, name, &sparc_opcodes[i]);
		if (retval != NULL && *retval != '\0') {
			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';

#if 0
	if (picmode)
		GOT_symbol = symbol_find_or_make("__GLOBAL_OFFSET_TABLE_");
#endif
} /* md_begin() */

void md_end() {
	return;
} /* md_end() */

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_seg == SEG_ABSOLUTE) {
		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 = NO_RELOC;	/* No longer relocated */
		}
	}

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

	/* put out the symbol-dependent stuff */
	if (the_insn.reloc != NO_RELOC) {
		fix_new(frag_now,              /* which frag */
			(toP - frag_now->fr_literal), /* where */
			4,                            /* size */
			the_insn.exp.X_add_symbol,
			the_insn.exp.X_subtract_symbol,
			the_insn.exp.X_add_number,
			the_insn.pcrel,
			the_insn.reloc,
			the_insn.exp.X_got_symbol);
	}
	switch (special_case) {

	case SPECIAL_CASE_SET:
		special_case = 0;
		know(the_insn.reloc == RELOC_HI22 ||
				the_insn.reloc == RELOC_BASE22);
		/* See if "set" operand has no low-order bits; skip OR if so. */
		if (the_insn.exp.X_seg == SEG_ABSOLUTE
		    && ((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, the_insn.opcode, 4);
		fix_new(frag_now,                           /* which frag */
			(toP - frag_now->fr_literal),       /* where */
			4,                                  /* size */
			the_insn.exp.X_add_symbol,
			the_insn.exp.X_subtract_symbol,
			the_insn.exp.X_add_number,
			the_insn.pcrel,
			the_insn.reloc==RELOC_BASE22?RELOC_BASE10:RELOC_LO10,
			the_insn.exp.X_got_symbol);
		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 == NO_RELOC);
		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, the_insn.opcode, 4);
		return;

	case 0:
		return;

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

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;

	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 = NO_RELOC;

		/*
		 * 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 's':
			case '1':
			case '2':
			case 'd':
			case 'x':
				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;

					case 'x':
						opcode |= (mask << 25) | mask;
						continue;

					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;
					case 'x':
						opcode |= (mask << 25) | mask;
						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 == 'u'
					     || *args == 'v'
					     || *args == 'B'
					     || *args == 'H')
					    && (mask & 1)) {
						break;
					} /* register must be even numbered */

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

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

				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 */
				/*
				 * In the case of a `set' pseudo instruction
				 * we have an implied `%hi' operator.
				 */
				if (special_case == SPECIAL_CASE_SET)
					the_insn.reloc = RELOC_HI22;
				else
					the_insn.reloc = RELOC_22;
				goto immediate;

			case 'l': /* 22 bit PC relative immediate */
				the_insn.reloc = RELOC_WDISP22;
				the_insn.pcrel = 1;
				goto immediate;

			case 'L': /* 30 bit immediate */
				the_insn.reloc =
#ifdef PIC
					picmode?RELOC_JMP_TBL:
#endif
					RELOC_WDISP30;
				the_insn.pcrel = 1;
				goto immediate;

			case 'n': /* 22 bit immediate */
				the_insn.reloc = RELOC_22;
				goto immediate;

			case 'i':   /* 13 bit immediate */
				the_insn.reloc = RELOC_13;

				/*FALLTHROUGH */

			immediate:
				if (*s == ' ')
				    s++;
				if (*s == '%') {
					if ((c = s[1]) == 'h' && s[2] == 'i') {
						if (the_insn.reloc != RELOC_22)
							as_bad(
						"`%hi' in improper context");
						the_insn.reloc = RELOC_HI22;
						s+=3;
					} else if (c == 'l' && s[2] == 'o') {
						the_insn.reloc = 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);
#ifdef PIC
				/*
				 * Handle refs to __GLOBAL_OFFSET_TABLE_
				 */
				if (the_insn.exp.X_got_symbol) {
					switch(the_insn.reloc) {
					case RELOC_22:
					case RELOC_HI22:
						the_insn.reloc = RELOC_PC22;
						the_insn.pcrel = 1;
						break;
					case RELOC_LO10:
						the_insn.reloc = RELOC_PC10;
						the_insn.pcrel = 1;
						break;
					default:
						break;
					}
				}

				if (picmode && the_insn.exp.X_add_symbol) {
					switch (the_insn.reloc) {
					case RELOC_LO10:
						the_insn.reloc = RELOC_BASE10;
						the_insn.exp.X_add_symbol->sy_forceout = 1;
						break;
					case RELOC_HI22:
						the_insn.reloc = RELOC_BASE22;
						the_insn.exp.X_add_symbol->sy_forceout = 1;
						break;
					case RELOC_13:
						the_insn.reloc = RELOC_BASE13;
						the_insn.exp.X_add_symbol->sy_forceout = 1;
						break;
					}
				}
#endif
				s = expr_end;
				continue;

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

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

				input_line_pointer = s;

				if (expression(&e) == SEG_ABSOLUTE) {
					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("sparc_ip: 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) {

					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;
#if DEBUG_SPARC
	if (flagseen['D'])
		print_insn(&the_insn);
#endif
	return;
} /* sparc_ip() */

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

	save_in = input_line_pointer;
	input_line_pointer = str;
	switch (seg = expression(&the_insn.exp)) {

	case SEG_ABSOLUTE:
	case SEG_TEXT:
	case SEG_DATA:
	case SEG_BSS:
	case SEG_UNKNOWN:
	case SEG_DIFFERENCE:
	case SEG_BIG:
	case SEG_ABSENT:
		break;

	default:
		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,(long)(*wordP++),sizeof(LITTLENUM_TYPE));
		litP+=sizeof(LITTLENUM_TYPE);
	}
	return "";	/* Someone should teach Dean about null pointers */
} /* md_atof() */

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

	switch (n) {

	case 4:
		*buf++ = val >> 24;
		*buf++ = val >> 16;
	case 2:
		*buf++ = val >> 8;
	case 1:
		*buf = val;
		break;

	default:
		as_fatal("md_number_to_chars: failed sanity check.");
	}
	return;
} /* md_number_to_chars() */

static int reloc_check(val, bits, fixP)
long val;
int bits;
fixS *fixP	/* For reporting errors */;
{
	if (((val & (-1 << bits)) != 0)
	    && ((val & (-1 << bits)) != (-1 << (bits - 0)))) {

		long addr = fixP->fx_where + fixP->fx_frag->fr_address;
		int ln;
		char *fname;

		if (fixP->fx_frag->line) {
			fname = fixP->fx_frag->line->file->filename;
			ln = fixP->fx_frag->line->line;
		} else {
			fname = "";
			ln = -1;
		}

		as_warn_where(fname, ln,
			"Relocation (%s) overflow at %#x, value truncated.",
			Reloc[fixP->fx_r_type], addr);
	} /* on overflow */

} /* reloc_check() */


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

void md_apply_fix(fixP, val)
fixS *fixP;
long val;
{
	char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
	long addr = fixP->fx_where + fixP->fx_frag->fr_address;

#if DEBUG_SPARC
	if (flagseen['D'])
		fprintf(stderr, "md_apply_fix: \"%s\" \"%s\", val %d -- %s\n",
				((fixP->fx_addsy != NULL)
				 ? ((S_GET_NAME(fixP->fx_addsy) != NULL)
				    ? S_GET_NAME(fixP->fx_addsy)
				    : "???")
				 : "0"),
				((fixP->fx_subsy != NULL)
				 ? ((S_GET_NAME(fixP->fx_subsy) != NULL)
				    ? S_GET_NAME(fixP->fx_subsy)
				    : "???")
				 : "0"),
			val, Reloc[fixP->fx_r_type]);
#endif

	assert(fixP->fx_size == 4);
	assert(fixP->fx_r_type < NO_RELOC);

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

	/*
	 * This is a hack.  There should be a better way to
	 * handle this.
	 */
	if (fixP->fx_r_type == RELOC_WDISP30 && fixP->fx_addsy) {
		val += fixP->fx_where + fixP->fx_frag->fr_address;
	}

	switch (fixP->fx_r_type) {

		/* Michael Bloom <mb@ttidca.tti.com> says...  [This] change was
		   made to match the behavior of Sun's assembler.  Some broken
		   loaders depend on that. At least one such loader actually
		   adds the section data to what it finds in the addend. (It
		   should only be using the addend like Sun's loader seems to).
		   This caused incorrect relocation: (addend + adjustment)
		   became  ( ( 2 * addend ) + adjustment ).  [and there should
		   be no cases that reach here anyway.  */
	case RELOC_32:
		if (fixP->fx_addsy == NULL) {
			/*
			 * Ok, the remarks above do not hold if the
			 * expression has been reduced to a number.
			 */
			buf[0] = val >> 24;
			buf[1] = val >> 16;
			buf[2] = val >> 8;
			buf[3] = val;
		} else {
			buf[0] = 0;
			buf[1] = 0;
			buf[2] = 0;
			buf[3] = 0;
		}
		break;

	case RELOC_JMP_TBL:
		if (!fixP->fx_addsy) {
			val = (val >>= 2) + 1;
			reloc_check(val, 30, fixP);

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

	case RELOC_WDISP30:
		val = (val >>= 2) + 1;
		reloc_check(val, 30, fixP);

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

	case RELOC_WDISP22:
		val = (val >>= 2) + 1;
		reloc_check(val, 22, fixP);

		buf[1] |= (val >> 16) & 0x3f;
		buf[2] = val >> 8;
		buf[3] = val;
		break;

	/*
	 * We should only use the RELOC_HI22 type as a result of the %hi
	 * operator (which is implicit in the case of the `set' pseudo op),
	 * This is NOT the same as using the `sethi' instruction, which merely
	 * puts the 22 bit operand into the high 22 bits of the destination
	 * register.
	 */
	case RELOC_22:
		if (!fixP->fx_addsy) {
			reloc_check(val, 22, fixP);

			buf[1] |= (val >> 16) & 0x3f;
			buf[2] = val >> 8;
			buf[3] = val;
		}
		break;

	case RELOC_HI22:
	case RELOC_BASE22:
		if (!fixP->fx_addsy) {
			buf[1] |= (val >> 26) & 0x3f;
			buf[2] = val >> 18;
			buf[3] = val >> 10;
		} else {
			if (picmode && fixP->fx_r_type == RELOC_HI22)
				as_warn("non-PIC access to %s",
						S_GET_NAME(fixP->fx_addsy));
			buf[2]=0;
			buf[3]=0;
		}
		break;

	case RELOC_13:
	case RELOC_BASE13:
		if (!fixP->fx_addsy) {
			reloc_check(val, 13, fixP);
			buf[2] |= (val >> 8) & 0x1f;
			buf[3] = val;
		} else {
			buf[3]=0;
		}
		break;

	case RELOC_LO10:
	case RELOC_BASE10:
		if (!fixP->fx_addsy) {
			buf[2] |= (val >> 8) & 0x03;
			buf[3] = val & 0xff;
		} else {
			if (picmode && fixP->fx_r_type == RELOC_LO10)
				as_warn("non-PIC access to %s",
						S_GET_NAME(fixP->fx_addsy));
			buf[3]=0;
		}
		break;

	case RELOC_PC10:
	case RELOC_PC22:
		if (fixP->fx_addsy != GOT_symbol) {
			as_fatal("GOT");
		}
		break;

#if 0
	case RELOC_8:         /* These don't seem to ever be needed. */
	case RELOC_16:
	case RELOC_DISP8:
	case RELOC_DISP16:
	case RELOC_DISP32:
	case RELOC_SEGOFF16:
	case RELOC_SFA_BASE:
	case RELOC_SFA_OFF13:

	case RELOC_GLOB_DAT: /* These are output by linker only */
	case RELOC_JMP_SLOT:
	case RELOC_RELATIVE:
#endif

	case NO_RELOC:
	default:
		as_bad("bad relocation type: 0x%02x", fixP->fx_r_type);
		break;
	}
} /* md_apply_fix() */

/* should never be called for sparc */
void md_create_short_jump(ptr, from_addr, to_addr, frag, to_symbol)
char *ptr;
long from_addr;
long to_addr;
fragS *frag;
symbolS *to_symbol;
{
	as_fatal("sparc_create_short_jmp\n");
} /* md_create_short_jump() */

/* Translate internal representation of relocation info to target format.

   On sparc: first 4 bytes are normal unsigned long address, next three
   bytes are index, most sig. byte first.  Byte 7 is broken up with
   bit 7 as external, bits 6 & 5 unused, and the lower
   five bits as relocation type.  Next 4 bytes are long addend. */
/* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com */
void tc_aout_fix_to_chars(where, fixP, segment_address_in_file)
char *where;
fixS *fixP;
relax_addressT segment_address_in_file;
{
	long r_index;
	long r_extern;
	long r_addend = 0;
	long r_address;
#ifdef PIC
	int kflag = 0;
#endif

	know(fixP->fx_addsy);

	if (!S_IS_DEFINED(fixP->fx_addsy)) {
		r_extern = 1;
		r_index = fixP->fx_addsy->sy_number;
	} else {
		r_extern = 0;
		r_index = S_GET_TYPE(fixP->fx_addsy);
#ifdef PIC
		if (picmode) {
			switch (fixP->fx_r_type) {
			case RELOC_BASE10:
			case RELOC_BASE13:
			case RELOC_BASE22:
				r_index = fixP->fx_addsy->sy_number;
				if (S_IS_EXTERNAL(fixP->fx_addsy))
					r_extern = 1;
				kflag = 1;
				break;

			case RELOC_32:
				if (!S_IS_EXTERNAL(fixP->fx_addsy))
					break;
				r_extern = 1;
				r_index = fixP->fx_addsy->sy_number;
				break;

			default:
				break;
			}
		}
#endif
	}

	/* this is easy */
	md_number_to_chars(where,
			   r_address = fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file,
			   4);

	/* now the fun stuff */
	where[4] = (r_index >> 16) & 0x0ff;
	where[5] = (r_index >> 8) & 0x0ff;
	where[6] = r_index & 0x0ff;
	where[7] = ((r_extern << 7)  & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F);

	/* Also easy */
	if (fixP->fx_addsy->sy_frag) {
		r_addend = fixP->fx_addsy->sy_frag->fr_address;
	}

	if (fixP->fx_pcrel) {
#ifdef PIC
		if (fixP->fx_gotsy) {
			r_addend = r_address;
			r_addend += fixP->fx_addnumber;
		} else
#endif
			r_addend -= r_address;
	} else {
#ifdef PIC
		if (kflag)
			r_addend = 0;
		else
#endif
			r_addend = fixP->fx_addnumber;
	}

	md_number_to_chars(&where[8], r_addend, 4);

	return;
} /* tc_aout_fix_to_chars() */

/* should never be called for sparc */
void md_convert_frag(headers, fragP)
object_headers *headers;
register fragS *fragP;
{
	as_fatal("sparc_convert_frag\n");
} /* md_convert_frag() */

/* should never be called for sparc */
void md_create_long_jump(ptr, from_addr, to_addr, frag, to_symbol)
char *ptr;
long from_addr, to_addr;
fragS	*frag;
symbolS	*to_symbol;
{
	as_fatal("sparc_create_long_jump\n");
} /* md_create_long_jump() */

/* should never be called for sparc */
int md_estimate_size_before_relax(fragP, segtype)
fragS *fragP;
segT segtype;
{
	as_fatal("sparc_estimate_size_before_relax\n");
	return(1);
} /* md_estimate_size_before_relax() */

#if DEBUG_SPARC
/* for debugging only */
static void print_insn(insn)
struct sparc_it *insn;
{

	if (insn->error) {
		fprintf(stderr, "ERROR: %s\n", insn->error);
	}
	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_subtract_symbol != NULL)
		 ? (S_GET_NAME(insn->exp.X_subtract_symbol)
		    ? S_GET_NAME(insn->exp.X_subtract_symbol)
		    : "???")
		 : "0"));
	fprintf(stderr, "\t\tX_got_symbol = %s\n",
		((insn->exp.X_got_symbol != NULL)
		 ? (S_GET_NAME(insn->exp.X_got_symbol)
		    ? S_GET_NAME(insn->exp.X_got_symbol)
		    : "???")
		 : "0"));
	fprintf(stderr, "\t\tX_add_number = %d\n",
		insn->exp.X_add_number);
	fprintf(stderr, "}\n");
	return;
} /* print_insn() */
#endif

/* Set the hook... */

/* void emit_sparc_reloc();
   void (*md_emit_relocations)() = emit_sparc_reloc; */

#ifdef comment

/*
 * Sparc/AM29K relocations are completely different, so it needs
 * this machine dependent routine to emit them.
 */
#if defined(OBJ_AOUT) || defined(OBJ_BOUT)
void emit_sparc_reloc(fixP, segment_address_in_file)
register fixS *fixP;
relax_addressT segment_address_in_file;
{
	struct reloc_info_generic ri;
	register symbolS *symbolP;
	extern char *next_object_file_charP;
	/*    long add_number; */

	memset((char *) &ri, '\0', sizeof(ri));
	for (; fixP; fixP = fixP->fx_next) {

		if (fixP->fx_r_type >= NO_RELOC) {
			as_fatal("fixP->fx_r_type = %d\n", fixP->fx_r_type);
		}

		if ((symbolP = fixP->fx_addsy) != NULL) {
			ri.r_address = fixP->fx_frag->fr_address +
			    fixP->fx_where - segment_address_in_file;
			if ((S_GET_TYPE(symbolP)) == N_UNDF) {
				ri.r_extern = 1;
				ri.r_index = symbolP->sy_number;
			} else {
				ri.r_extern = 0;
				ri.r_index = S_GET_TYPE(symbolP);
			}
			if (symbolP && symbolP->sy_frag) {
				ri.r_addend = symbolP->sy_frag->fr_address;
			}
			ri.r_type = fixP->fx_r_type;
			if (fixP->fx_pcrel) {
				/*		ri.r_addend -= fixP->fx_where; */
				ri.r_addend -= ri.r_address;
			} else {
				ri.r_addend = fixP->fx_addnumber;
			}

			md_ri_to_chars(next_object_file_charP, &ri);
			next_object_file_charP += md_reloc_size;
		}
	}
	return;
} /* emit_sparc_reloc() */
#endif /* aout or bout */
#endif /* comment */

/*
 * 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
 *		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 PIC
	} else if (**argP == 'k' || **argP == 'K') {
		/* Predefine GOT symbol */
		GOT_symbol = symbol_find_or_make("__GLOBAL_OFFSET_TABLE_");
#endif
	} 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;
{
} /* md_operand() */

/* Round up a section size to the appropriate boundary. */
long md_section_align(segment, size)
segT segment;
long size;
{
	return((size + 7) & ~7); /* Round all sects to multiple of 8 */
} /* md_section_align() */

/* 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;
{
#ifdef PIC
	/*
	 * _GLOBAL_OFFSET_TABLE_ refs are relative to the offset of the
	 * current instruction. We omit fx_size from the computation (which
	 * is always 4 anyway).
	 */
	if (fixP->fx_gotsy)
		return fixP->fx_where + fixP->fx_frag->fr_address;
	else
#endif
	return(fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address);
} /* md_pcrel_from() */

void tc_aout_pre_write_hook(headers)
object_headers *headers;
{
	H_SET_VERSION(headers, 1);
	return;
} /* tc_aout_pre_write_hook() */

/*
 * Local Variables:
 * comment-column: 0
 * fill-column: 131
 * End:
 */

/* end of tc-sparc.c */