patch-2.4.3 linux/drivers/scsi/aic7xxx/aicasm/aicasm_gram.y

Next file: linux/drivers/scsi/aic7xxx/aicasm/aicasm_insformat.h
Previous file: linux/drivers/scsi/aic7xxx/aicasm/aicasm.h
Back to the patch index
Back to the overall index

diff -u --recursive --new-file v2.4.2/linux/drivers/scsi/aic7xxx/aicasm/aicasm_gram.y linux/drivers/scsi/aic7xxx/aicasm/aicasm_gram.y
@@ -0,0 +1,1455 @@
+%{
+/*
+ * Parser for the Aic7xxx SCSI Host adapter sequencer assembler.
+ *
+ * Copyright (c) 1997, 1998, 2000 Justin T. Gibbs.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: //depot/src/aic7xxx/aicasm/aicasm_gram.y#6 $
+ *
+ * $FreeBSD: src/sys/dev/aic7xxx/aicasm/aicasm_gram.y,v 1.12 2000/10/31 18:44:32 gibbs Exp $
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+
+#include <sys/types.h>
+#ifdef __linux__
+#include "../queue.h"
+#else
+#include <sys/queue.h>
+#endif
+
+#include "aicasm.h"
+#include "aicasm_symbol.h"
+#include "aicasm_insformat.h"
+
+int yylineno;
+char *yyfilename;
+static symbol_t *cur_symbol;
+static symtype cur_symtype;
+static symbol_t *accumulator;
+static symbol_ref_t allones;
+static symbol_ref_t allzeros;
+static symbol_ref_t none;
+static symbol_ref_t sindex;
+static int instruction_ptr;
+static int sram_or_scb_offset;
+static int download_constant_count;
+static int in_critical_section;
+
+static void process_bitmask(int mask_type, symbol_t *sym, int mask);
+static void initialize_symbol(symbol_t *symbol);
+static void process_register(symbol_t **p_symbol);
+static void format_1_instr(int opcode, symbol_ref_t *dest,
+			   expression_t *immed, symbol_ref_t *src, int ret);
+static void format_2_instr(int opcode, symbol_ref_t *dest,
+			   expression_t *places, symbol_ref_t *src, int ret);
+static void format_3_instr(int opcode, symbol_ref_t *src,
+			   expression_t *immed, symbol_ref_t *address);
+static void test_readable_symbol(symbol_t *symbol);
+static void test_writable_symbol(symbol_t *symbol);
+static void type_check(symbol_t *symbol, expression_t *expression, int and_op);
+static void make_expression(expression_t *immed, int value);
+static void add_conditional(symbol_t *symbol);
+static int  is_download_const(expression_t *immed);
+
+#define YYDEBUG 1
+#define SRAM_SYMNAME "SRAM_BASE"
+#define SCB_SYMNAME "SCB_BASE"
+%}
+
+%union {
+	int		value;
+	char		*str;
+	symbol_t	*sym;
+	symbol_ref_t	sym_ref;
+	expression_t	expression;
+}
+
+%token T_REGISTER
+
+%token <value> T_CONST
+
+%token T_DOWNLOAD
+
+%token T_SCB
+
+%token T_SRAM
+
+%token T_ALIAS
+
+%token T_SIZE
+
+%token <value> T_ADDRESS
+
+%token T_ACCESS_MODE
+
+%token <value> T_MODE
+
+%token T_BEGIN_CS
+
+%token T_END_CS
+
+%token T_BIT
+
+%token T_MASK
+
+%token <value> T_NUMBER
+
+%token <str> T_PATH
+
+%token <sym> T_CEXPR
+
+%token T_EOF T_INCLUDE 
+
+%token <value> T_SHR T_SHL T_ROR T_ROL
+
+%token <value> T_MVI T_MOV T_CLR T_BMOV
+
+%token <value> T_JMP T_JC T_JNC T_JE T_JNE T_JNZ T_JZ T_CALL
+
+%token <value> T_ADD T_ADC
+
+%token <value> T_INC T_DEC
+
+%token <value> T_STC T_CLC
+
+%token <value> T_CMP T_NOT T_XOR
+
+%token <value> T_TEST T_AND
+
+%token <value> T_OR
+
+%token T_RET
+
+%token T_NOP
+
+%token T_ACCUM T_ALLONES T_ALLZEROS T_NONE T_SINDEX
+
+%token T_A
+
+%token <sym> T_SYMBOL
+
+%token T_NL
+
+%token T_IF T_ELSE T_ELSE_IF T_ENDIF
+
+%type <sym_ref> reg_symbol address destination source opt_source
+
+%type <expression> expression immediate immediate_or_a
+
+%type <value> ret f1_opcode f2_opcode jmp_jc_jnc_call jz_jnz je_jne
+
+%type <value> numerical_value
+
+%left '|'
+%left '&'
+%left '+' '-'
+%right '~'
+%nonassoc UMINUS
+%%
+
+program:
+	include
+|	program include
+|	register
+|	program register
+|	constant
+|	program constant
+|	scratch_ram
+|	program scratch_ram
+|	scb
+|	program scb
+|	label
+|	program label
+|	critical_section_start
+|	program critical_section_start
+|	critical_section_end
+|	program critical_section_end
+|	conditional
+|	program conditional
+|	code
+|	program code
+;
+
+include:
+	T_INCLUDE '<' T_PATH '>'
+	{ include_file($3, BRACKETED_INCLUDE); }
+|	T_INCLUDE '"' T_PATH '"'
+	{ include_file($3, QUOTED_INCLUDE); }
+;
+
+register:
+	T_REGISTER { cur_symtype = REGISTER; } reg_definition
+;
+
+reg_definition:
+	T_SYMBOL '{'
+		{
+			if ($1->type != UNINITIALIZED) {
+				stop("Register multiply defined", EX_DATAERR);
+				/* NOTREACHED */
+			}
+			cur_symbol = $1; 
+			cur_symbol->type = cur_symtype;
+			initialize_symbol(cur_symbol);
+		}
+		reg_attribute_list
+	'}'
+		{                    
+			/*
+			 * Default to allowing everything in for registers
+			 * with no bit or mask definitions.
+			 */
+			if (cur_symbol->info.rinfo->valid_bitmask == 0)
+				cur_symbol->info.rinfo->valid_bitmask = 0xFF;
+
+			if (cur_symbol->info.rinfo->size == 0)
+				cur_symbol->info.rinfo->size = 1;
+
+			/*
+			 * This might be useful for registers too.
+			 */
+			if (cur_symbol->type != REGISTER) {
+				if (cur_symbol->info.rinfo->address == 0)
+					cur_symbol->info.rinfo->address =
+					    sram_or_scb_offset;
+				sram_or_scb_offset +=
+				    cur_symbol->info.rinfo->size;
+			}
+			cur_symbol = NULL;
+		}
+;
+
+reg_attribute_list:
+	reg_attribute
+|	reg_attribute_list reg_attribute
+;
+
+reg_attribute:		
+	reg_address
+|	size
+|	access_mode
+|	bit_defn
+|	mask_defn
+|	alias
+|	accumulator
+|	allones
+|	allzeros
+|	none
+|	sindex
+;
+
+reg_address:
+	T_ADDRESS T_NUMBER
+	{
+		cur_symbol->info.rinfo->address = $2;
+	}
+;
+
+size:
+	T_SIZE T_NUMBER
+	{
+		cur_symbol->info.rinfo->size = $2;
+	}
+;
+
+access_mode:
+	T_ACCESS_MODE T_MODE
+	{
+		cur_symbol->info.rinfo->mode = $2;
+	}
+;
+
+bit_defn:
+	T_BIT T_SYMBOL T_NUMBER
+	{
+		process_bitmask(BIT, $2, $3);
+	}
+;
+
+mask_defn:
+	T_MASK T_SYMBOL expression
+	{
+		process_bitmask(MASK, $2, $3.value);
+	}
+;
+
+alias:
+	T_ALIAS	T_SYMBOL
+	{
+		if ($2->type != UNINITIALIZED) {
+			stop("Re-definition of register alias",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		$2->type = ALIAS;
+		initialize_symbol($2);
+		$2->info.ainfo->parent = cur_symbol;
+	}
+;
+
+accumulator:
+	T_ACCUM
+	{
+		if (accumulator != NULL) {
+			stop("Only one accumulator definition allowed",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		accumulator = cur_symbol;
+	}
+;
+
+allones:
+	T_ALLONES
+	{
+		if (allones.symbol != NULL) {
+			stop("Only one definition of allones allowed",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		allones.symbol = cur_symbol;
+	}
+;
+
+allzeros:
+	T_ALLZEROS
+	{
+		if (allzeros.symbol != NULL) {
+			stop("Only one definition of allzeros allowed",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		allzeros.symbol = cur_symbol;
+	}
+;
+
+none:
+	T_NONE
+	{
+		if (none.symbol != NULL) {
+			stop("Only one definition of none allowed",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		none.symbol = cur_symbol;
+	}
+;
+
+sindex:
+	T_SINDEX
+	{
+		if (sindex.symbol != NULL) {
+			stop("Only one definition of sindex allowed",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		sindex.symbol = cur_symbol;
+	}
+;
+
+expression:
+	expression '|' expression
+	{
+		 $$.value = $1.value | $3.value;
+		 symlist_merge(&$$.referenced_syms,
+			       &$1.referenced_syms,
+			       &$3.referenced_syms);
+	}
+|	expression '&' expression
+	{
+		$$.value = $1.value & $3.value;
+		symlist_merge(&$$.referenced_syms,
+			       &$1.referenced_syms,
+			       &$3.referenced_syms);
+	}
+|	expression '+' expression
+	{
+		$$.value = $1.value + $3.value;
+		symlist_merge(&$$.referenced_syms,
+			       &$1.referenced_syms,
+			       &$3.referenced_syms);
+	}
+|	expression '-' expression
+	{
+		$$.value = $1.value - $3.value;
+		symlist_merge(&($$.referenced_syms),
+			       &($1.referenced_syms),
+			       &($3.referenced_syms));
+	}
+|	'(' expression ')'
+	{
+		$$ = $2;
+	}
+|	'~' expression
+	{
+		$$ = $2;
+		$$.value = (~$$.value) & 0xFF;
+	}
+|	'-' expression %prec UMINUS
+	{
+		$$ = $2;
+		$$.value = -$$.value;
+	}
+|	T_NUMBER
+	{
+		$$.value = $1;
+		SLIST_INIT(&$$.referenced_syms);
+	}
+|	T_SYMBOL
+	{
+		symbol_t *symbol;
+
+		symbol = $1;
+		switch (symbol->type) {
+		case ALIAS:
+			symbol = $1->info.ainfo->parent;
+		case REGISTER:
+		case SCBLOC:
+		case SRAMLOC:
+			$$.value = symbol->info.rinfo->address;
+			break;
+		case MASK:
+		case BIT:
+			$$.value = symbol->info.minfo->mask;
+			break;
+		case DOWNLOAD_CONST:
+		case CONST:
+			$$.value = symbol->info.cinfo->value;
+			break;
+		case UNINITIALIZED:
+		default:
+		{
+			char buf[255];
+
+			snprintf(buf, sizeof(buf),
+				 "Undefined symbol %s referenced",
+				 symbol->name);
+			stop(buf, EX_DATAERR);
+			/* NOTREACHED */
+			break;
+		}
+		}
+		SLIST_INIT(&$$.referenced_syms);
+		symlist_add(&$$.referenced_syms, symbol, SYMLIST_INSERT_HEAD);
+	}
+;
+
+constant:
+	T_CONST T_SYMBOL numerical_value
+	{
+		if ($2->type != UNINITIALIZED) {
+			stop("Re-definition of symbol as a constant",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		$2->type = CONST;
+		initialize_symbol($2);
+		$2->info.cinfo->value = $3;
+		$2->info.cinfo->define = $1;
+	}
+|	T_CONST T_SYMBOL T_DOWNLOAD
+	{
+		if ($1) {
+			stop("Invalid downloaded constant declaration",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		if ($2->type != UNINITIALIZED) {
+			stop("Re-definition of symbol as a downloaded constant",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		$2->type = DOWNLOAD_CONST;
+		initialize_symbol($2);
+		$2->info.cinfo->value = download_constant_count++;
+		$2->info.cinfo->define = FALSE;
+	}
+;
+
+numerical_value:
+	T_NUMBER
+	{
+		$$ = $1;
+	}
+|	'-' T_NUMBER
+	{
+		$$ = -$2;
+	}
+;
+
+scratch_ram:
+	T_SRAM '{'
+		{
+			cur_symbol = symtable_get(SRAM_SYMNAME);
+			cur_symtype = SRAMLOC;
+			if (cur_symbol->type != UNINITIALIZED) {
+				stop("Only one SRAM definition allowed",
+				     EX_DATAERR);
+				/* NOTREACHED */
+			}
+			cur_symbol->type = SRAMLOC;
+			initialize_symbol(cur_symbol);
+		}
+		reg_address
+		{
+			sram_or_scb_offset = cur_symbol->info.rinfo->address;
+		}
+		scb_or_sram_reg_list
+	'}'
+		{
+			cur_symbol = NULL;
+		}
+;
+
+scb:
+	T_SCB '{'
+		{
+			cur_symbol = symtable_get(SCB_SYMNAME);
+			cur_symtype = SCBLOC;
+			if (cur_symbol->type != UNINITIALIZED) {
+				stop("Only one SRAM definition allowed",
+				     EX_SOFTWARE);
+				/* NOTREACHED */
+			}
+			cur_symbol->type = SCBLOC;
+			initialize_symbol(cur_symbol);
+			/* 64 bytes of SCB space */
+			cur_symbol->info.rinfo->size = 64;
+		}
+		reg_address
+		{
+			sram_or_scb_offset = cur_symbol->info.rinfo->address;
+		}
+		scb_or_sram_reg_list
+	'}'
+		{
+			cur_symbol = NULL;
+		}
+;
+
+scb_or_sram_reg_list:
+	reg_definition
+|	scb_or_sram_reg_list reg_definition
+;
+
+reg_symbol:
+	T_SYMBOL
+	{
+		process_register(&$1);
+		$$.symbol = $1;
+		$$.offset = 0;
+	}
+|	T_SYMBOL '[' T_SYMBOL ']'
+	{
+		process_register(&$1);
+		if ($3->type != CONST) {
+			stop("register offset must be a constant", EX_DATAERR);
+			/* NOTREACHED */
+		}
+		if (($3->info.cinfo->value + 1) > $1->info.rinfo->size) {
+			stop("Accessing offset beyond range of register",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		$$.symbol = $1;
+		$$.offset = $3->info.cinfo->value;
+	}
+|	T_SYMBOL '[' T_NUMBER ']'
+	{
+		process_register(&$1);
+		if (($3 + 1) > $1->info.rinfo->size) {
+			stop("Accessing offset beyond range of register",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		$$.symbol = $1;
+		$$.offset = $3;
+	}
+|	T_A
+	{
+		if (accumulator == NULL) {
+			stop("No accumulator has been defined", EX_DATAERR);
+			/* NOTREACHED */
+		}
+		$$.symbol = accumulator;
+		$$.offset = 0;
+	}
+;
+
+destination:
+	reg_symbol
+	{
+		test_writable_symbol($1.symbol);
+		$$ = $1;
+	}
+;
+
+immediate:
+	expression
+	{ $$ = $1; }
+;
+
+immediate_or_a:
+	expression
+	{
+		$$ = $1;
+	}
+|	T_A
+	{
+		SLIST_INIT(&$$.referenced_syms);
+		$$.value = 0;
+	}
+;
+
+source:
+	reg_symbol
+	{
+		test_readable_symbol($1.symbol);
+		$$ = $1;
+	}
+;
+
+opt_source:
+	{
+		$$.symbol = NULL;
+		$$.offset = 0;
+	}
+|	',' source
+	{ $$ = $2; }
+;
+
+ret:
+	{ $$ = 0; }
+|	T_RET
+	{ $$ = 1; }
+;
+
+critical_section_start:
+	T_BEGIN_CS
+	{
+		critical_section_t *cs;
+
+		if (in_critical_section != FALSE) {
+			stop("Critical Section within Critical Section",
+			     EX_DATAERR);
+			/* NOTREACHED */
+		}
+		cs = cs_alloc();
+		cs->begin_addr = instruction_ptr;
+		in_critical_section = TRUE;
+	}
+
+critical_section_end:
+	T_END_CS
+	{
+		critical_section_t *cs;
+
+		if (in_critical_section == FALSE) {
+			stop("Unballanced 'end_cs'", EX_DATAERR);
+			/* NOTREACHED */
+		}
+		cs = TAILQ_LAST(&cs_tailq, cs_tailq);
+		cs->end_addr = instruction_ptr;
+		in_critical_section = FALSE;
+	}
+
+label:
+	T_SYMBOL ':'
+	{
+		if ($1->type != UNINITIALIZED) {
+			stop("Program label multiply defined", EX_DATAERR);
+			/* NOTREACHED */
+		}
+		$1->type = LABEL;
+		initialize_symbol($1);
+		$1->info.linfo->address = instruction_ptr;
+	}
+;
+
+address:
+	T_SYMBOL
+	{
+		$$.symbol = $1;
+		$$.offset = 0;
+	}
+|	T_SYMBOL '+' T_NUMBER
+	{
+		$$.symbol = $1;
+		$$.offset = $3;
+	}
+|	T_SYMBOL '-' T_NUMBER
+	{
+		$$.symbol = $1;
+		$$.offset = -$3;
+	}
+|	'.'
+	{
+		$$.symbol = NULL;
+		$$.offset = 0;
+	}
+|	'.' '+' T_NUMBER
+	{
+		$$.symbol = NULL;
+		$$.offset = $3;
+	}
+|	'.' '-' T_NUMBER
+	{
+		$$.symbol = NULL;
+		$$.offset = -$3;
+	}
+;
+
+conditional:
+	T_IF T_CEXPR '{'
+	{
+		scope_t *new_scope;
+
+		add_conditional($2);
+		new_scope = scope_alloc();
+		new_scope->type = SCOPE_IF;
+		new_scope->begin_addr = instruction_ptr;
+		new_scope->func_num = $2->info.condinfo->func_num;
+	}
+|	T_ELSE T_IF T_CEXPR '{'
+	{
+		scope_t *new_scope;
+		scope_t *scope_context;
+		scope_t *last_scope;
+
+		/*
+		 * Ensure that the previous scope is either an
+		 * if or and else if.
+		 */
+		scope_context = SLIST_FIRST(&scope_stack);
+		last_scope = TAILQ_LAST(&scope_context->inner_scope,
+					scope_tailq);
+		if (last_scope == NULL
+		 || last_scope->type == T_ELSE) {
+
+			stop("'else if' without leading 'if'", EX_DATAERR);
+			/* NOTREACHED */
+		}
+		add_conditional($3);
+		new_scope = scope_alloc();
+		new_scope->type = SCOPE_ELSE_IF;
+		new_scope->begin_addr = instruction_ptr;
+		new_scope->func_num = $3->info.condinfo->func_num;
+	}
+|	T_ELSE '{'
+	{
+		scope_t *new_scope;
+		scope_t *scope_context;
+		scope_t *last_scope;
+
+		/*
+		 * Ensure that the previous scope is either an
+		 * if or and else if.
+		 */
+		scope_context = SLIST_FIRST(&scope_stack);
+		last_scope = TAILQ_LAST(&scope_context->inner_scope,
+					scope_tailq);
+		if (last_scope == NULL
+		 || last_scope->type == SCOPE_ELSE) {
+
+			stop("'else' without leading 'if'", EX_DATAERR);
+			/* NOTREACHED */
+		}
+		new_scope = scope_alloc();
+		new_scope->type = SCOPE_ELSE;
+		new_scope->begin_addr = instruction_ptr;
+	}
+;
+
+conditional:
+	'}'
+	{
+		scope_t *scope_context;
+
+		scope_context = SLIST_FIRST(&scope_stack);
+		if (scope_context->type == SCOPE_ROOT) {
+			stop("Unexpected '}' encountered", EX_DATAERR);
+			/* NOTREACHED */
+		}
+
+		scope_context->end_addr = instruction_ptr;
+
+		/* Pop the scope */
+		SLIST_REMOVE_HEAD(&scope_stack, scope_stack_links);
+
+		process_scope(scope_context);
+
+		if (SLIST_FIRST(&scope_stack) == NULL) {
+			stop("Unexpected '}' encountered", EX_DATAERR);
+			/* NOTREACHED */
+		}
+	}
+;
+
+f1_opcode:
+	T_AND { $$ = AIC_OP_AND; }
+|	T_XOR { $$ = AIC_OP_XOR; }
+|	T_ADD { $$ = AIC_OP_ADD; }
+|	T_ADC { $$ = AIC_OP_ADC; }
+;
+
+code:
+	f1_opcode destination ',' immediate_or_a opt_source ret ';'
+	{
+		format_1_instr($1, &$2, &$4, &$5, $6);
+	}
+;
+
+code:
+	T_OR reg_symbol ',' immediate_or_a opt_source ret ';'
+	{
+		format_1_instr(AIC_OP_OR, &$2, &$4, &$5, $6);
+	}
+;
+
+code:
+	T_INC destination opt_source ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 1);
+		format_1_instr(AIC_OP_ADD, &$2, &immed, &$3, $4);
+	}
+;
+
+code:
+	T_DEC destination opt_source ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, -1);
+		format_1_instr(AIC_OP_ADD, &$2, &immed, &$3, $4);
+	}
+;
+
+code:
+	T_CLC ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, -1);
+		format_1_instr(AIC_OP_ADD, &none, &immed, &allzeros, $2);
+	}
+|	T_CLC T_MVI destination ',' immediate_or_a ret ';'
+	{
+		format_1_instr(AIC_OP_ADD, &$3, &$5, &allzeros, $6);
+	}
+;
+
+code:
+	T_STC ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 1);
+		format_1_instr(AIC_OP_ADD, &none, &immed, &allones, $2);
+	}
+|	T_STC destination ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 1);
+		format_1_instr(AIC_OP_ADD, &$2, &immed, &allones, $3);
+	}
+;
+
+code:
+	T_BMOV destination ',' source ',' immediate ret ';'
+	{
+		format_1_instr(AIC_OP_BMOV, &$2, &$6, &$4, $7);
+	}
+;
+
+code:
+	T_MOV destination ',' source ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 1);
+		format_1_instr(AIC_OP_BMOV, &$2, &immed, &$4, $5);
+	}
+;
+
+code:
+	T_MVI destination ',' immediate_or_a ret ';'
+	{
+		format_1_instr(AIC_OP_OR, &$2, &$4, &allzeros, $5);
+	}
+;
+
+code:
+	T_NOT destination opt_source ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 0xff);
+		format_1_instr(AIC_OP_XOR, &$2, &immed, &$3, $4);
+	}
+;
+
+code:
+	T_CLR destination ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 0xff);
+		format_1_instr(AIC_OP_AND, &$2, &immed, &allzeros, $3);
+	}
+;
+
+code:
+	T_NOP ret ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 0xff);
+		format_1_instr(AIC_OP_AND, &none, &immed, &allzeros, $2);
+	}
+;
+
+code:
+	T_RET ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 0xff);
+		format_1_instr(AIC_OP_AND, &none, &immed, &allzeros, TRUE);
+	}
+;
+
+	/*
+	 * This grammer differs from the one in the aic7xxx
+	 * reference manual since the grammer listed there is
+	 * ambiguous and causes a shift/reduce conflict.
+	 * It also seems more logical as the "immediate"
+	 * argument is listed as the second arg like the
+	 * other formats.
+	 */
+
+f2_opcode:
+	T_SHL { $$ = AIC_OP_SHL; }
+|	T_SHR { $$ = AIC_OP_SHR; }
+|	T_ROL { $$ = AIC_OP_ROL; }
+|	T_ROR { $$ = AIC_OP_ROR; }
+;
+
+code:
+	f2_opcode destination ',' expression opt_source ret ';'
+	{
+		format_2_instr($1, &$2, &$4, &$5, $6);
+	}
+;
+
+jmp_jc_jnc_call:
+	T_JMP	{ $$ = AIC_OP_JMP; }
+|	T_JC	{ $$ = AIC_OP_JC; }
+|	T_JNC	{ $$ = AIC_OP_JNC; }
+|	T_CALL	{ $$ = AIC_OP_CALL; }
+;
+
+jz_jnz:
+	T_JZ	{ $$ = AIC_OP_JZ; }
+|	T_JNZ	{ $$ = AIC_OP_JNZ; }
+;
+
+je_jne:
+	T_JE	{ $$ = AIC_OP_JE; }
+|	T_JNE	{ $$ = AIC_OP_JNE; }
+;
+
+code:
+	jmp_jc_jnc_call address ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 0);
+		format_3_instr($1, &sindex, &immed, &$2);
+	}
+;
+
+code:
+	T_OR reg_symbol ',' immediate jmp_jc_jnc_call address ';'
+	{
+		format_3_instr($5, &$2, &$4, &$6);
+	}
+;
+
+code:
+	T_TEST source ',' immediate_or_a jz_jnz address ';'
+	{
+		format_3_instr($5, &$2, &$4, &$6);
+	}
+;
+
+code:
+	T_CMP source ',' immediate_or_a je_jne address ';'
+	{
+		format_3_instr($5, &$2, &$4, &$6);
+	}
+;
+
+code:
+	T_MOV source jmp_jc_jnc_call address ';'
+	{
+		expression_t immed;
+
+		make_expression(&immed, 0);
+		format_3_instr($3, &$2, &immed, &$4);
+	}
+;
+
+code:
+	T_MVI immediate jmp_jc_jnc_call address ';'
+	{
+		format_3_instr($3, &allzeros, &$2, &$4);
+	}
+;
+
+%%
+
+static void
+process_bitmask(int mask_type, symbol_t *sym, int mask)
+{
+	/*
+	 * Add the current register to its
+	 * symbol list, if it already exists,
+	 * warn if we are setting it to a
+	 * different value, or in the bit to
+	 * the "allowed bits" of this register.
+	 */
+	if (sym->type == UNINITIALIZED) {
+		sym->type = mask_type;
+		initialize_symbol(sym);
+		if (mask_type == BIT) {
+			if (mask == 0) {
+				stop("Bitmask with no bits set", EX_DATAERR);
+				/* NOTREACHED */
+			}
+			if ((mask & ~(0x01 << (ffs(mask) - 1))) != 0) {
+				stop("Bitmask with more than one bit set",
+				     EX_DATAERR);
+				/* NOTREACHED */
+			}
+		}
+		sym->info.minfo->mask = mask;
+	} else if (sym->type != mask_type) {
+		stop("Bit definition mirrors a definition of the same "
+		     " name, but a different type", EX_DATAERR);
+		/* NOTREACHED */
+	} else if (mask != sym->info.minfo->mask) {
+		stop("Bitmask redefined with a conflicting value", EX_DATAERR);
+		/* NOTREACHED */
+	}
+	/* Fail if this symbol is already listed */
+	if (symlist_search(&(sym->info.minfo->symrefs),
+			   cur_symbol->name) != NULL) {
+		stop("Bitmask defined multiple times for register", EX_DATAERR);
+		/* NOTREACHED */
+	}
+	symlist_add(&(sym->info.minfo->symrefs), cur_symbol,
+		    SYMLIST_INSERT_HEAD);
+	cur_symbol->info.rinfo->valid_bitmask |= mask;
+	cur_symbol->info.rinfo->typecheck_masks = TRUE;
+}
+
+static void
+initialize_symbol(symbol_t *symbol)
+{
+	switch (symbol->type) {
+        case UNINITIALIZED:
+		stop("Call to initialize_symbol with type field unset",
+		     EX_SOFTWARE);
+		/* NOTREACHED */
+		break;
+        case REGISTER:
+        case SRAMLOC:
+        case SCBLOC:
+		symbol->info.rinfo =
+		    (struct reg_info *)malloc(sizeof(struct reg_info));
+		if (symbol->info.rinfo == NULL) {
+			stop("Can't create register info", EX_SOFTWARE);
+			/* NOTREACHED */
+		}
+		memset(symbol->info.rinfo, 0,
+		       sizeof(struct reg_info));
+		break;
+        case ALIAS:
+		symbol->info.ainfo =
+		    (struct alias_info *)malloc(sizeof(struct alias_info));
+		if (symbol->info.ainfo == NULL) {
+			stop("Can't create alias info", EX_SOFTWARE);
+			/* NOTREACHED */
+		}
+		memset(symbol->info.ainfo, 0,
+		       sizeof(struct alias_info));
+		break;
+        case MASK:
+        case BIT:
+		symbol->info.minfo =
+		    (struct mask_info *)malloc(sizeof(struct mask_info));
+		if (symbol->info.minfo == NULL) {
+			stop("Can't create bitmask info", EX_SOFTWARE);
+			/* NOTREACHED */
+		}
+		memset(symbol->info.minfo, 0, sizeof(struct mask_info));
+		SLIST_INIT(&(symbol->info.minfo->symrefs));
+		break;
+        case CONST:
+        case DOWNLOAD_CONST:
+		symbol->info.cinfo =
+		    (struct const_info *)malloc(sizeof(struct const_info));
+		if (symbol->info.cinfo == NULL) {
+			stop("Can't create alias info", EX_SOFTWARE);
+			/* NOTREACHED */
+		}
+		memset(symbol->info.cinfo, 0,
+		       sizeof(struct const_info));
+		break;
+	case LABEL:
+		symbol->info.linfo =
+		    (struct label_info *)malloc(sizeof(struct label_info));
+		if (symbol->info.linfo == NULL) {
+			stop("Can't create label info", EX_SOFTWARE);
+			/* NOTREACHED */
+		}
+		memset(symbol->info.linfo, 0,
+		       sizeof(struct label_info));
+		break;
+	case CONDITIONAL:
+		symbol->info.condinfo =
+		    (struct cond_info *)malloc(sizeof(struct cond_info));
+		if (symbol->info.condinfo == NULL) {
+			stop("Can't create conditional info", EX_SOFTWARE);
+			/* NOTREACHED */
+		}
+		memset(symbol->info.condinfo, 0,
+		       sizeof(struct cond_info));
+		break;
+	default:
+		stop("Call to initialize_symbol with invalid symbol type",
+		     EX_SOFTWARE);
+		/* NOTREACHED */
+		break;
+	}
+}
+
+static void
+process_register(symbol_t **p_symbol)
+{
+	char buf[255];
+	symbol_t *symbol = *p_symbol;
+
+	if (symbol->type == UNINITIALIZED) {
+		snprintf(buf, sizeof(buf), "Undefined register %s",
+			 symbol->name);
+		stop(buf, EX_DATAERR);
+		/* NOTREACHED */
+	} else if (symbol->type == ALIAS) {
+		*p_symbol = symbol->info.ainfo->parent;
+	} else if ((symbol->type != REGISTER)
+		&& (symbol->type != SCBLOC)
+		&& (symbol->type != SRAMLOC)) {
+		snprintf(buf, sizeof(buf),
+			 "Specified symbol %s is not a register",
+			 symbol->name);
+		stop(buf, EX_DATAERR);
+	}
+}
+
+static void
+format_1_instr(int opcode, symbol_ref_t *dest, expression_t *immed,
+	       symbol_ref_t *src, int ret)
+{
+	struct instruction *instr;
+	struct ins_format1 *f1_instr;
+
+	if (src->symbol == NULL)
+		src = dest;
+
+	/* Test register permissions */
+	test_writable_symbol(dest->symbol);
+	test_readable_symbol(src->symbol);
+
+	/* Ensure that immediate makes sense for this destination */
+	type_check(dest->symbol, immed, opcode);
+
+	/* Allocate sequencer space for the instruction and fill it out */
+	instr = seq_alloc();
+	f1_instr = &instr->format.format1;
+	f1_instr->ret = ret ? 1 : 0;
+	f1_instr->opcode = opcode;
+	f1_instr->destination = dest->symbol->info.rinfo->address
+			      + dest->offset;
+	f1_instr->source = src->symbol->info.rinfo->address
+			 + src->offset;
+	f1_instr->immediate = immed->value;
+
+	if (is_download_const(immed))
+		f1_instr->parity = 1;
+
+	symlist_free(&immed->referenced_syms);
+	instruction_ptr++;
+}
+
+static void
+format_2_instr(int opcode, symbol_ref_t *dest, expression_t *places,
+	       symbol_ref_t *src, int ret)
+{
+	struct instruction *instr;
+	struct ins_format2 *f2_instr;
+	uint8_t shift_control;
+
+	if (src->symbol == NULL)
+		src = dest;
+
+	/* Test register permissions */
+	test_writable_symbol(dest->symbol);
+	test_readable_symbol(src->symbol);
+
+	/* Allocate sequencer space for the instruction and fill it out */
+	instr = seq_alloc();
+	f2_instr = &instr->format.format2;
+	f2_instr->ret = ret ? 1 : 0;
+	f2_instr->opcode = AIC_OP_ROL;
+	f2_instr->destination = dest->symbol->info.rinfo->address
+			      + dest->offset;
+	f2_instr->source = src->symbol->info.rinfo->address
+			 + src->offset;
+	if (places->value > 8 || places->value <= 0) {
+		stop("illegal shift value", EX_DATAERR);
+		/* NOTREACHED */
+	}
+	switch (opcode) {
+	case AIC_OP_SHL:
+		if (places->value == 8)
+			shift_control = 0xf0;
+		else
+			shift_control = (places->value << 4) | places->value;
+		break;
+	case AIC_OP_SHR:
+		if (places->value == 8) {
+			shift_control = 0xf8;
+		} else {
+			shift_control = (places->value << 4)
+				      | (8 - places->value)
+				      | 0x08;
+		}
+		break;
+	case AIC_OP_ROL:
+		shift_control = places->value & 0x7;
+		break;
+	case AIC_OP_ROR:
+		shift_control = (8 - places->value) | 0x08;
+		break;
+	default:
+		shift_control = 0; /* Quiet Compiler */
+		stop("Invalid shift operation specified", EX_SOFTWARE);
+		/* NOTREACHED */
+		break;
+	};
+	f2_instr->shift_control = shift_control;
+	symlist_free(&places->referenced_syms);
+	instruction_ptr++;
+}
+
+static void
+format_3_instr(int opcode, symbol_ref_t *src,
+	       expression_t *immed, symbol_ref_t *address)
+{
+	struct instruction *instr;
+	struct ins_format3 *f3_instr;
+	int addr;
+
+	/* Test register permissions */
+	test_readable_symbol(src->symbol);
+
+	/* Ensure that immediate makes sense for this source */
+	type_check(src->symbol, immed, opcode);
+
+	/* Allocate sequencer space for the instruction and fill it out */
+	instr = seq_alloc();
+	f3_instr = &instr->format.format3;
+	if (address->symbol == NULL) {
+		/* 'dot' referrence.  Use the current instruction pointer */
+		addr = instruction_ptr + address->offset;
+	} else if (address->symbol->type == UNINITIALIZED) {
+		/* forward reference */
+		addr = address->offset;
+		instr->patch_label = address->symbol;
+	} else
+		addr = address->symbol->info.linfo->address + address->offset;
+	f3_instr->opcode = opcode;
+	f3_instr->address = addr;
+	f3_instr->source = src->symbol->info.rinfo->address
+			 + src->offset;
+	f3_instr->immediate = immed->value;
+
+	if (is_download_const(immed))
+		f3_instr->parity = 1;
+
+	symlist_free(&immed->referenced_syms);
+	instruction_ptr++;
+}
+
+static void
+test_readable_symbol(symbol_t *symbol)
+{
+	if (symbol->info.rinfo->mode == WO) {
+		stop("Write Only register specified as source",
+		     EX_DATAERR);
+		/* NOTREACHED */
+	}
+}
+
+static void
+test_writable_symbol(symbol_t *symbol)
+{
+	if (symbol->info.rinfo->mode == RO) {
+		stop("Read Only register specified as destination",
+		     EX_DATAERR);
+		/* NOTREACHED */
+	}
+}
+
+static void
+type_check(symbol_t *symbol, expression_t *expression, int opcode)
+{
+	symbol_node_t *node;
+	int and_op;
+	char buf[255];
+
+	and_op = FALSE;
+	if (opcode == AIC_OP_AND || opcode == AIC_OP_JNZ || AIC_OP_JZ)
+		and_op = TRUE;
+
+	/*
+	 * Make sure that we aren't attempting to write something
+	 * that hasn't been defined.  If this is an and operation,
+	 * this is a mask, so "undefined" bits are okay.
+	 */
+	if (and_op == FALSE
+	 && (expression->value & ~symbol->info.rinfo->valid_bitmask) != 0) {
+		snprintf(buf, sizeof(buf),
+			 "Invalid bit(s) 0x%x in immediate written to %s",
+			 expression->value & ~symbol->info.rinfo->valid_bitmask,
+			 symbol->name);
+		stop(buf, EX_DATAERR);
+		/* NOTREACHED */
+	}
+
+	/*
+	 * Now make sure that all of the symbols referenced by the
+	 * expression are defined for this register.
+	 */
+	if(symbol->info.rinfo->typecheck_masks != FALSE) {
+		for(node = expression->referenced_syms.slh_first;
+		    node != NULL;
+		    node = node->links.sle_next) {
+			if ((node->symbol->type == MASK
+			  || node->symbol->type == BIT)
+			 && symlist_search(&node->symbol->info.minfo->symrefs,
+					   symbol->name) == NULL) {
+				snprintf(buf, sizeof(buf),
+					 "Invalid bit or mask %s "
+					 "for register %s",
+					 node->symbol->name, symbol->name);
+				stop(buf, EX_DATAERR);
+				/* NOTREACHED */
+			}
+		}
+	}
+}
+
+static void
+make_expression(expression_t *immed, int value)
+{
+	SLIST_INIT(&immed->referenced_syms);
+	immed->value = value & 0xff;
+}
+
+static void
+add_conditional(symbol_t *symbol)
+{
+	static int numfuncs;
+
+	if (numfuncs == 0) {
+		/* add a special conditional, "0" */
+		symbol_t *false_func;
+
+		false_func = symtable_get("0");
+		if (false_func->type != UNINITIALIZED) {
+			stop("Conditional expression '0' "
+			     "conflicts with a symbol", EX_DATAERR);
+			/* NOTREACHED */
+		}
+		false_func->type = CONDITIONAL;
+		initialize_symbol(false_func);
+		false_func->info.condinfo->func_num = numfuncs++;
+		symlist_add(&patch_functions, false_func, SYMLIST_INSERT_HEAD);
+	}
+
+	/* This condition has occurred before */
+	if (symbol->type == CONDITIONAL)
+		return;
+
+	if (symbol->type != UNINITIALIZED) {
+		stop("Conditional expression conflicts with a symbol",
+		     EX_DATAERR);
+		/* NOTREACHED */
+	}
+
+	symbol->type = CONDITIONAL;
+	initialize_symbol(symbol);
+	symbol->info.condinfo->func_num = numfuncs++;
+	symlist_add(&patch_functions, symbol, SYMLIST_INSERT_HEAD);
+}
+
+void
+yyerror(const char *string)
+{
+	stop(string, EX_DATAERR);
+}
+
+static int
+is_download_const(expression_t *immed)
+{
+	if ((immed->referenced_syms.slh_first != NULL)
+	 && (immed->referenced_syms.slh_first->symbol->type == DOWNLOAD_CONST))
+		return (TRUE);
+
+	return (FALSE);
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)