/*
* symbol.c
*
* PACKAGE: as31 - 8031/8051 Assembler.
*
* DESCRIPTION:
* This file contains the symbol table search/insertion routines
* associated with user defined symbols.
*
* The reserved keyword (instructions/directives) look up routine
* is defined here.
*
* The opcode table for all of the instructions is located in this
* file.
*
* REVISION HISTORY:
* Jan. 19, 1990 - Created. (Ken Stauffer)
*
* AUTHOR:
* All code in this file written by Ken Stauffer (University of Calgary)
* January, 1990.
*/
#include "as31.h"
#define NULL (0)
#define B(a) (0xF0+(a))
#define ACC(a) (0xE0+(a))
#define PSW(a) (0xD0+(a))
#define T2CON(a) (0xC8+(a))
#define IP(a) (0xB8+(a))
#define P3(a) (0xB0+(a))
#define IE(a) (0xA8+(a))
#define P2(a) (0xA0+(a))
#define SCON(a) (0x98+(a))
#define P1(a) (0x90+(a))
#define TCON(a) (0x88+(a))
#define P0(a) (0x80+(a))
/*
* sinit[]
* These symbols are not reserved keywords.
* This array contains the initial symbol table entries
* for the user symbol table. The symbols are
* basically convienient names that make writting
* in 8031/8051 bearable.
*
* The function syminit() inserts these entries into the
* symbol table.
*/
static struct symbol sinit[] = {
{ "AC", LABEL, PSW(6), NULL },
{ "ACC", LABEL, ACC(0), NULL },
{ "B", LABEL, B(0), NULL },
{ "CY", LABEL, PSW(7), NULL },
{ "DPH", LABEL, 0x83, NULL },
{ "DPL", LABEL, 0x82, NULL },
{ "EA", LABEL, IE(7), NULL },
{ "ES", LABEL, IE(4), NULL },
{ "ET0", LABEL, IE(1), NULL },
{ "ET1", LABEL, IE(3), NULL },
{ "ET2", LABEL, IE(5), NULL },
{ "EX0", LABEL, IE(0), NULL },
{ "EX1", LABEL, IE(2), NULL },
{ "EXEN2", LABEL, T2CON(3),NULL },
{ "EXF2", LABEL, T2CON(6),NULL },
{ "F0", LABEL, PSW(5), NULL },
{ "IE", LABEL, IE(0), NULL },
{ "IE0", LABEL, TCON(1),NULL },
{ "IE1", LABEL, TCON(3),NULL },
{ "IP", LABEL, IP(0), NULL },
{ "IT0", LABEL, TCON(0),NULL },
{ "IT1", LABEL, TCON(2),NULL },
{ "OV", LABEL, PSW(2), NULL },
{ "P", LABEL, PSW(0), NULL },
{ "P0", LABEL, P0(0), NULL },
{ "P1", LABEL, P1(0), NULL },
{ "P2", LABEL, P2(0), NULL },
{ "P3", LABEL, P3(0), NULL },
{ "PCON", LABEL, 0x87, NULL },
{ "PS", LABEL, IP(4), NULL },
{ "PSW", LABEL, PSW(0), NULL },
{ "PT0", LABEL, IP(1), NULL },
{ "PT1", LABEL, IP(3), NULL },
{ "PT2", LABEL, IP(5), NULL },
{ "PX0", LABEL, IP(0), NULL },
{ "PX1", LABEL, IP(2), NULL },
{ "RB8", LABEL, SCON(2),NULL },
{ "RCAP2H", LABEL, 0xCB, NULL },
{ "RCAP2L", LABEL, 0xCA, NULL },
{ "RCLK", LABEL, T2CON(5),NULL },
{ "REN", LABEL, SCON(4),NULL },
{ "RI", LABEL, SCON(0),NULL },
{ "RL2", LABEL, T2CON(0),NULL },
{ "RS0", LABEL, PSW(3), NULL },
{ "RS1", LABEL, PSW(4), NULL },
{ "SBUF", LABEL, 0x99, NULL },
{ "SCON", LABEL, SCON(0),NULL },
{ "SM0", LABEL, SCON(7),NULL },
{ "SM1", LABEL, SCON(6),NULL },
{ "SM2", LABEL, SCON(5),NULL },
{ "SP", LABEL, 0x81, NULL },
{ "T2CON", LABEL, T2CON(0),NULL },
{ "TB8", LABEL, SCON(3),NULL },
{ "TCLK", LABEL, T2CON(4),NULL },
{ "TCON", LABEL, TCON(0),NULL },
{ "TF0", LABEL, TCON(5),NULL },
{ "TF1", LABEL, TCON(7),NULL },
{ "TF2", LABEL, T2CON(7),NULL },
{ "TH0", LABEL, 0x8C, NULL },
{ "TH1", LABEL, 0x8D, NULL },
{ "TH2", LABEL, 0xCD, NULL },
{ "TI", LABEL, SCON(1),NULL },
{ "TL0", LABEL, 0x8A, NULL },
{ "TL1", LABEL, 0x8B, NULL },
{ "TL2", LABEL, 0xCC, NULL },
{ "TMOD", LABEL, 0x89, NULL },
{ "TR0", LABEL, TCON(4),NULL },
{ "TR1", LABEL, TCON(6),NULL },
{ "TR2", LABEL, T2CON(2),NULL }
};
#define SINITSIZE (sizeof(sinit)/sizeof(sinit[0]))
/*
* opcode vectors:
* These arrays contain the various opcodes for the
* various forms an instruction may take.
*
* The ordering of these opcodes is very critical to the
* proper fuctioning of the assembler.
*
* When a given form of an instruction is parsed, the parser
* indexes one of these arrays by the correct amount and thus
* obtains the correct opcode for the particular form.
*
*/
static unsigned char acall[]= { 0x11 };
static unsigned char add[]= { 0x28, 0x25, 0x26, 0x24 };
static unsigned char addc[]= { 0x38, 0x35, 0x36, 0x34 };
static unsigned char ajmp[]= { 0x01 };
static unsigned char anl[]= { 0x58, 0x55, 0x56, 0x54, 0x52, 0x53, 0x82,
0xb0 };
static unsigned char cjne[]= { 0xb5, 0xb4, 0xb8, 0xb6 };
static unsigned char clr[]= { 0xe4, 0xc3, 0xc2 };
static unsigned char cpl[]= { 0xf4, 0xb3, 0xb2 };
static unsigned char da[]= { 0xd4 };
static unsigned char dec[]= { 0x14, 0x18, 0x15, 0x16 };
static unsigned char div[]= { 0x84 };
static unsigned char djnz[]= { 0xd8, 0xd5 };
static unsigned char inc[]= { 0x04, 0x08, 0x05, 0x06, 0xa3 };
static unsigned char jb[]= { 0x20 };
static unsigned char jbc[]= { 0x10 };
static unsigned char jc[]= { 0x40 };
static unsigned char jmp[]= { 0x73 };
static unsigned char jnb[]= { 0x30 };
static unsigned char jnc[]= { 0x50 };
static unsigned char jnz[]= { 0x70 };
static unsigned char jz[]= { 0x60 };
static unsigned char lcall[]= { 0x12 };
static unsigned char ljmp[]= { 0x02 };
static unsigned char mov[]= { 0xe8, 0xe5, 0xe6, 0x74, 0xf5, 0x75, 0xf8,
0xa8, 0x78, 0x88, 0x85, 0x86, 0xf6, 0xa6,
0x76, 0x90, 0xa2, 0x92 };
static unsigned char movc[]= { 0x93, 0x83 };
static unsigned char movx[]= { 0xe2, 0xe3, 0xe0, 0xf2, 0xf3, 0xf0 };
static unsigned char mul[]= { 0xa4 };
static unsigned char nop[]= { 0x00 };
static unsigned char orl[]= { 0x48, 0x45, 0x46, 0x44, 0x42, 0x43, 0x72,
0xa0 };
static unsigned char pop[]= { 0xd0 };
static unsigned char push[]= { 0xc0 };
static unsigned char ret[]= { 0x22 };
static unsigned char reti[]= { 0x32 };
static unsigned char rl[]= { 0x23 };
static unsigned char rlc[]= { 0x33 };
static unsigned char rr[]= { 0x03 };
static unsigned char rrc[]= { 0x13 };
static unsigned char setb[]= { 0xd3, 0xd2 };
static unsigned char sjmp[]= { 0x80 };
static unsigned char subb[]= { 0x98, 0x95, 0x96, 0x94 };
static unsigned char swap[]= { 0xc4 };
static unsigned char xch[]= { 0xc8, 0xc5, 0xc6 };
static unsigned char xchd[]= { 0xd6 };
static unsigned char xrl[]= { 0x68, 0x65, 0x66, 0x64, 0x62, 0x63 };
/*
* optable[]
* This table contains opcodes, directives and a few reserved
* symbols.
*
* The second field is the keywords token value.
*
* Unless the symbol is an opcode, the third field will
* be NULL.
*
* The third field is a pointer to an array of opcode bytes.
*/
static struct opcode optable[] = {
{"a", A, NULL },
{"ab", AB, NULL },
{"acall", ACALL, acall },
{"add", ADD, add },
{"addc", ADDC, addc },
{"ajmp", AJMP, ajmp },
{"anl", ANL, anl },
{"byte", D_BYTE, NULL },
{"c", C, NULL },
{"cjne", CJNE, cjne },
{"clr", CLR, clr },
{"cpl", CPL, cpl },
{"da", DA, da },
{"dec", DEC, dec },
{"div", DIV, div },
{"djnz", DJNZ, djnz },
{"dptr", DPTR, NULL },
{"end", D_END, NULL },
{"equ", D_EQU, NULL },
{"flag", D_FLAG, NULL },
{"inc", INC, inc },
{"jb", JB, jb },
{"jbc", JBC, jbc },
{"jc", JC, jc },
{"jmp", JMP, jmp },
{"jnb", JNB, jnb },
{"jnc", JNC, jnc },
{"jnz", JNZ, jnz },
{"jz", JZ, jz },
{"lcall", LCALL, lcall },
{"ljmp", LJMP, ljmp },
{"mov", MOV, mov },
{"movc", MOVC, movc },
{"movx", MOVX, movx },
{"mul", MUL, mul },
{"nop", NOP, nop },
{"org", D_ORG, NULL },
{"orl", ORL, orl },
{"pc", PC, NULL },
{"pop", POP, pop },
{"push", PUSH, push },
{"r0", R0, NULL },
{"r1", R1, NULL },
{"r2", R2, NULL },
{"r3", R3, NULL },
{"r4", R4, NULL },
{"r5", R5, NULL },
{"r6", R6, NULL },
{"r7", R7, NULL },
{"ret", RET, ret },
{"reti", RETI, reti },
{"rl", RL, rl },
{"rlc", RLC, rlc },
{"rr", RR, rr },
{"rrc", RRC, rrc },
{"setb", SETB, setb },
{"sjmp", SJMP, sjmp },
{"skip", D_SKIP, NULL },
{"subb", SUBB, subb },
{"swap", SWAP, swap },
{"word", D_WORD, NULL },
{"xch", XCH, xch },
{"xchd", XCHD, xchd },
{"xrl", XRL, xrl }
};
#define OPTABSIZE (sizeof(optable)/sizeof(struct opcode))
/*
* strcase:
* A case IN-sensitive string compare.
*/
strcase(s, t)
char *s, *t;
{
for( ; (*s | 040) == (*t | 040); s++, t++)
if (*s == '\0')
return(0);
return( (*s | 040) - (*t | 040) );
}
/*
* lookop:
* Do a binary search through optable[], for a matching
* symbol. Return the symbol found or NULL.
*/
struct opcode *lookop(s)
char *s;
{
register int low, high, mid, cond;
low = 0;
high = OPTABSIZE-1;
while ( low <= high ) {
mid = (low + high) / 2;
if ( (cond = strcase(s, optable[mid].name)) < 0 )
high = mid - 1;
else if (cond > 0 )
low = mid + 1;
else
return(&optable[mid]);
}
return(NULL);
}
/*
* symtab, hash, looksym:
* User symbol table routines.
* symtab is the hash table for the user symbols.
* (chaining is used for collision resolution).
*/
static struct symbol *symtab[HASHTABSIZE];
static int hash(s)
char *s;
{
char *p;
long h = 0L, g;
for (p = s; *p; p++) {
h = (h << 4) + *p;
if (g = h & 0xf0000000 ) {
h = h ^ (g >> 24);
h = h ^ g;
}
}
return (h % HASHTABSIZE);
}
struct symbol *looksym(s)
char *s;
{
register struct symbol *ptr, *prev;
char *malloc(), *p;
register int hv;
hv = hash(s);
prev = NULL;
for (ptr = symtab[hv]; ptr; ptr = ptr->next) {
if (!strcmp(ptr->name, s)) {
if (prev != NULL) {
prev->next = ptr->next;
ptr->next = symtab[hv];
symtab[hv] = ptr;
}
return(ptr);
}
prev = ptr;
}
if (p = malloc(strlen(s) + 1))
strcpy(p, s);
else
error("Cannot allocate %d bytes", strlen(s) + 1);
ptr = (struct symbol *) malloc(sizeof(struct symbol));
if (ptr == NULL)
error("Cannot allocate %d bytes", sizeof(struct symbol));
ptr->name = p;
ptr->type = UNDEF;
ptr->next = symtab[hv];
symtab[hv] = ptr;
return(ptr);
}
/*
* syminit:
* Initializes the hash table, with the initial symbols from
* sinit[]
*/
syminit()
{
register int i,hv;
for (i = 0; i < SINITSIZE; i++) {
hv = hash(sinit[i].name);
if (symtab[hv])
sinit[i].next = symtab[hv];
symtab[hv] = &sinit[i];
}
}
