aicasm_gram.y

IXP425 平台下嵌入式LINUX的SCSI设备的驱动程序

	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));
		/*
		 * Default to allowing access in all register modes
		 * or to the mode specified by the SCB or SRAM space
		 * we are in.
		 */
		if (scb_or_sram_symbol != NULL)
			symbol->info.rinfo->modes =
			    scb_or_sram_symbol->info.rinfo->modes;
		else
			symbol->info.rinfo->modes = ~0;
		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;
	case MACRO:
		symbol->info.macroinfo = 
		    (struct macro_info *)malloc(sizeof(struct macro_info));
		if (symbol->info.macroinfo == NULL) {
			stop("Can't create macro info", EX_SOFTWARE);
			/* NOTREACHED */
		}
		memset(symbol->info.macroinfo, 0,
		       sizeof(struct macro_info));
		STAILQ_INIT(&symbol->info.macroinfo->args);
		break;
	default:
		stop("Call to initialize_symbol with invalid symbol type",
		     EX_SOFTWARE);
		/* NOTREACHED */
		break;
	}
}

static void
add_macro_arg(const char *argtext, int argnum)
{
	struct macro_arg *marg;
	int i;
	int retval;
		

	if (cur_symbol == NULL || cur_symbol->type != MACRO) {
		stop("Invalid current symbol for adding macro arg",
		     EX_SOFTWARE);
		/* NOTREACHED */
	}

	marg = (struct macro_arg *)malloc(sizeof(*marg));
	if (marg == NULL) {
		stop("Can't create macro_arg structure", EX_SOFTWARE);
		/* NOTREACHED */
	}
	marg->replacement_text = NULL;
	retval = snprintf(regex_pattern, sizeof(regex_pattern),
			  "[^-/A-Za-z0-9_](%s)([^-/A-Za-z0-9_]|$)",
			  argtext);
	if (retval >= sizeof(regex_pattern)) {
		stop("Regex text buffer too small for arg",
		     EX_SOFTWARE);
		/* NOTREACHED */
	}
	retval = regcomp(&marg->arg_regex, regex_pattern, REG_EXTENDED);
	if (retval != 0) {
		stop("Regex compilation failed", EX_SOFTWARE);
		/* NOTREACHED */
	}
	STAILQ_INSERT_TAIL(&cur_symbol->info.macroinfo->args, marg, links);
}

static void
add_macro_body(const char *bodytext)
{
	if (cur_symbol == NULL || cur_symbol->type != MACRO) {
		stop("Invalid current symbol for adding macro arg",
		     EX_SOFTWARE);
		/* NOTREACHED */
	}
	cur_symbol->info.macroinfo->body = strdup(bodytext);
	if (cur_symbol->info.macroinfo->body == NULL) {
		stop("Can't duplicate macro body text", EX_SOFTWARE);
		/* NOTREACHED */
	}
}

static void
process_register(symbol_t **p_symbol)
{
	symbol_t *symbol = *p_symbol;

	if (symbol->type == UNINITIALIZED) {
		snprintf(errbuf, sizeof(errbuf), "Undefined register %s",
			 symbol->name);
		stop(errbuf, 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(errbuf, sizeof(errbuf),
			 "Specified symbol %s is not a register",
			 symbol->name);
		stop(errbuf, 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;
	else if (dest->symbol == mode_ptr.symbol) {
		u_int src_value;
		u_int dst_value;

		/*
		 * Attempt to update mode information if
		 * we are operating on the mode register.
		 */
		if (src->symbol == allones.symbol)
			src_value = 0xFF;
		else if (src->symbol == allzeros.symbol)
			src_value = 0;
		else if (src->symbol == mode_ptr.symbol)
			src_value = (dst_mode << 4) | src_mode;
		else
			goto cant_update;

		switch (opcode) {
		case AIC_OP_AND:
			dst_value = src_value & immed->value;
			break;
		case AIC_OP_XOR:
			dst_value = src_value ^ immed->value;
			break;
		case AIC_OP_ADD:
			dst_value = (src_value + immed->value) & 0xFF;
			break;
		case AIC_OP_OR:
			dst_value = src_value | immed->value;
			break;
			break;
		case AIC_OP_BMOV:
			dst_value = src_value;
			break;
		default:
			goto cant_update;
		}
		src_mode = dst_value & 0xF;
		dst_mode = (dst_value >> 4) & 0xF;
cant_update:
	}

	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->modes & (0x1 << src_mode)) == 0) {
		snprintf(errbuf, sizeof(errbuf),
			"Register %s unavailable in source reg mode %d",
			symbol->name, src_mode);
		stop(errbuf, EX_DATAERR);
	}

	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->modes & (0x1 << dst_mode)) == 0) {
		snprintf(errbuf, sizeof(errbuf),
			"Register %s unavailable in destination reg mode %d",
			symbol->name, dst_mode);
		stop(errbuf, EX_DATAERR);
	}

	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;

	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(errbuf, sizeof(errbuf),
			 "Invalid bit(s) 0x%x in immediate written to %s",
			 expression->value & ~symbol->info.rinfo->valid_bitmask,
			 symbol->name);
		stop(errbuf, 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(errbuf, sizeof(errbuf),
					 "Invalid bit or mask %s "
					 "for register %s",
					 node->symbol->name, symbol->name);
				stop(errbuf, 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);
}

static void
add_version(const char *verstring)
{
	const char prefix[] = " * ";
	int newlen;
	int oldlen;

	newlen = strlen(verstring) + strlen(prefix);
	oldlen = 0;
	if (versions != NULL)
		oldlen = strlen(versions);
	versions = realloc(versions, newlen + oldlen + 2);
	if (versions == NULL)
		stop("Can't allocate version string", EX_SOFTWARE);
	strcpy(&versions[oldlen], prefix);
	strcpy(&versions[oldlen + strlen(prefix)], verstring);
	versions[newlen + oldlen] = '\n';
	versions[newlen + oldlen + 1] = '\0';
}

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);
}