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freebsd-nq/sys/dev/aic7xxx/aicasm_gram.y
Peter Wemm c3aac50f28 $Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00

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%{
/*
* Parser for the Aic7xxx SCSI Host adapter sequencer assembler.
*
* Copyright (c) 1997-1998 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, immediately at the beginning of the file.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*
* $FreeBSD$
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <sys/types.h>
#include <sys/queue.h>
#include "aicasm.h"
#include "aicasm_symbol.h"
#include "sequencer.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 void process_bitmask __P((int mask_type, symbol_t *sym, int mask));
static void initialize_symbol __P((symbol_t *symbol));
static void process_register __P((symbol_t **p_symbol));
static void format_1_instr __P((int opcode, symbol_ref_t *dest,
expression_t *immed, symbol_ref_t *src,
int ret));
static void format_2_instr __P((int opcode, symbol_ref_t *dest,
expression_t *places, symbol_ref_t *src,
int ret));
static void format_3_instr __P((int opcode, symbol_ref_t *src,
expression_t *immed, symbol_ref_t *address));
static void test_readable_symbol __P((symbol_t *symbol));
static void test_writable_symbol __P((symbol_t *symbol));
static void type_check __P((symbol_t *symbol, expression_t *expression,
int and_op));
static void make_expression __P((expression_t *immed, int value));
static void add_conditional __P((symbol_t *symbol));
static int is_download_const __P((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_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_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
| 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);
}
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_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
{ $$ = 1; }
;
label:
T_SYMBOL ':'
{
if ($1->type != UNINITIALIZED) {
stop("Program label multiply defined", EX_DATAERR);
/* NOTREACHED */
}
$1->type = LABEL;
initialize_symbol($1);
$1->info.linfo->address = instruction_ptr;
}
;
address:
T_SYMBOL
{
$$.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;
$$.offset = -$3;
}
;
conditional:
T_IF T_CEXPR '{'
{
scope_t *new_scope;
add_conditional($2);
new_scope = scope_alloc();
new_scope->type = SCOPE_IF;
new_scope->begin_addr = instruction_ptr;
new_scope->func_num = $2->info.condinfo->func_num;
}
| T_ELSE T_IF T_CEXPR '{'
{
scope_t *new_scope;
scope_t *scope_context;
scope_t *last_scope;
/*
* Ensure that the previous scope is either an
* if or and else if.
*/
scope_context = SLIST_FIRST(&scope_stack);
last_scope = TAILQ_LAST(&scope_context->inner_scope,
scope_tailq);
if (last_scope == NULL
|| last_scope->type == T_ELSE) {
stop("'else if' without leading 'if'", EX_DATAERR);
/* NOTREACHED */
}
add_conditional($3);
new_scope = scope_alloc();
new_scope->type = SCOPE_ELSE_IF;
new_scope->begin_addr = instruction_ptr;
new_scope->func_num = $3->info.condinfo->func_num;
}
| T_ELSE '{'
{
scope_t *new_scope;
scope_t *scope_context;
scope_t *last_scope;
/*
* Ensure that the previous scope is either an
* if or and else if.
*/
scope_context = SLIST_FIRST(&scope_stack);
last_scope = TAILQ_LAST(&scope_context->inner_scope,
scope_tailq);
if (last_scope == NULL
|| last_scope->type == SCOPE_ELSE) {
stop("'else' without leading 'if'", EX_DATAERR);
/* NOTREACHED */
}
new_scope = scope_alloc();
new_scope->type = SCOPE_ELSE;
new_scope->begin_addr = instruction_ptr;
}
;
conditional:
'}'
{
scope_t *scope_context;
scope_t *last_scope;
scope_context = SLIST_FIRST(&scope_stack);
if (scope_context->type == SCOPE_ROOT) {
stop("Unexpected '}' encountered", EX_DATAERR);
/* NOTREACHED */
}
scope_context->end_addr = instruction_ptr;
/* Pop the scope */
SLIST_REMOVE_HEAD(&scope_stack, scope_stack_links);
process_scope(scope_context);
if (SLIST_FIRST(&scope_stack) == NULL) {
stop("Unexpected '}' encountered", EX_DATAERR);
/* NOTREACHED */
}
}
;
f1_opcode:
T_AND { $$ = 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, 0xff);
format_1_instr(AIC_OP_AND, &$2, &immed, &$4, $5);
}
;
code:
T_MVI destination ',' immediate_or_a ret ';'
{
format_1_instr(AIC_OP_OR, &$2, &$4, &allzeros, $5);
}
;
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(mask_type, sym, mask)
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)
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(p_symbol)
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(opcode, dest, immed, src, ret)
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(opcode, dest, places, src, ret)
int opcode;
symbol_ref_t *dest;
expression_t *places;
symbol_ref_t *src;
int ret;
{
struct instruction *instr;
struct ins_format2 *f2_instr;
u_int8_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(opcode, src, immed, address)
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)
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)
symbol_t *symbol;
{
if (symbol->info.rinfo->mode == RO) {
stop("Read Only register specified as destination",
EX_DATAERR);
/* NOTREACHED */
}
}
static void
type_check(symbol, expression, opcode)
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(immed, value)
expression_t *immed;
int value;
{
SLIST_INIT(&immed->referenced_syms);
immed->value = value & 0xff;
}
static void
add_conditional(symbol)
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(string)
const char *string;
{
stop(string, EX_DATAERR);
}
static int
is_download_const(immed)
expression_t *immed;
{
if ((immed->referenced_syms.slh_first != NULL)
&& (immed->referenced_syms.slh_first->symbol->type == DOWNLOAD_CONST))
return (TRUE);
return (FALSE);
}
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