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435cdb0b7f
They behave observably different from generic string parsing and trying to account for them generically just gets in the way. .rept is treated the same as a macro.
1622 lines
64 KiB
C
1622 lines
64 KiB
C
#define ASSEMBLE__C
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#include <stdlib.h>
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#include <string.h>
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#include "assemble.h" /* my own definitions */
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#include "assemble_globals.h"
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#include "assemble_aux.h"
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#include "util.h"
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#include "mlb.h"
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#include "object.h"
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#include "listing.h"
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#include "parse.h"
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#include "symbols.h"
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#include "extree.h"
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#include "macros.h"
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#include "rept_irpc.h"
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#include "rad50.h"
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/* assemble - read a line from the input stack, assemble it. */
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/* This function is way way too large, because I just coded most of
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the operation code and pseudo-op handling right in line. */
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static int assemble(
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STACK *stack,
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TEXT_RLD *tr)
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{
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char *cp; /* Parse character pointer */
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char *opcp; /* Points to operation mnemonic text */
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char *ncp; /* "next" cp */
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char *label; /* A label */
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char *line; /* The whole line */
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SYMBOL *op; /* The operation SYMBOL */
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int local; /* Whether a label is a local label or
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not */
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line = stack_gets(stack);
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if (line == NULL)
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return -1; /* Return code for EOF. */
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if (!enabl_lc) { /* If lower case disabled, */
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upcase(line); /* turn it into upper case. */
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}
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cp = line;
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/* Frankly, I don't need to keep "line." But I found it quite
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handy during debugging, to see what the whole operation was,
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when I'm down to parsing the second operand and things aren't
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going right. */
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stmtno++; /* Increment statement number */
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list_source(stack->top, line); /* List source */
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if (suppressed) {
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/* Assembly is suppressed by unsatisfied conditional. Look
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for ending and enabling statements. */
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op = get_op(cp, &cp); /* Look at operation code */
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/* FIXME: this code will blindly look into .REM commentary and
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find operation codes. Incidentally, so will read_body. */
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if (op == NULL)
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return 1; /* Not found. Don't care. */
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if (op->section->type != SECTION_PSEUDO)
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return 1; /* Not a pseudo-op. */
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switch (op->value) {
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case P_IF:
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case P_IFDF:
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suppressed++; /* Nested. Suppressed. */
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break;
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case P_IFTF:
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if (suppressed == 1) /* Reduce suppression from 1 to 0. */
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suppressed = 0;
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break;
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case P_IFF:
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if (suppressed == 1) { /* Can reduce suppression from 1 to 0. */
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if (!conds[last_cond].ok)
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suppressed = 0;
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}
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break;
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case P_IFT:
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if (suppressed == 1) { /* Can reduce suppression from 1 to 0. */
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if (conds[last_cond].ok)
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suppressed = 0;
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}
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break;
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case P_ENDC:
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suppressed--; /* Un-nested. */
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if (suppressed == 0)
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pop_cond(last_cond - 1); /* Re-enabled. */
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break;
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}
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return 1;
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}
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/* The line may begin with "label<ws>:[:]" */
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opcp = cp;
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if ((label = get_symbol(cp, &ncp, &local)) != NULL) {
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int flag = SYMBOLFLAG_PERMANENT | SYMBOLFLAG_DEFINITION | local;
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SYMBOL *sym;
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ncp = skipwhite(ncp);
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if (*ncp == ':') { /* Colon, for symbol definition? */
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ncp++;
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/* maybe it's a global definition */
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if (*ncp == ':') {
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flag |= SYMBOLFLAG_GLOBAL; /* Yes, include global flag */
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ncp++;
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}
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sym = add_sym(label, DOT, flag, current_pc->section, &symbol_st);
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cp = ncp;
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if (sym == NULL)
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report(stack->top, "Illegal symbol definition %s\n", label);
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free(label);
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/* See if local symbol block should be incremented */
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if (!enabl_lsb && !local) {
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lsb = get_next_lsb();
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}
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cp = skipwhite(ncp);
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opcp = cp;
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label = get_symbol(cp, &ncp, NULL); /* Now, get what follows */
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}
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}
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/* PSEUDO P_IIF jumps here. */
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reassemble:
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cp = skipwhite(cp);
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if (EOL(*cp))
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return 1; /* It's commentary. All done. */
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if (label) { /* Something looks like a label. */
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/* detect assignment */
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ncp = skipwhite(ncp); /* The pointer to the text that
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follows the symbol */
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if (*ncp == '=') {
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unsigned flags;
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EX_TREE *value;
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SYMBOL *sym;
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cp = ncp;
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/* Symbol assignment. */
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flags = SYMBOLFLAG_DEFINITION | local;
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cp++;
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if (*cp == '=') {
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flags |= SYMBOLFLAG_GLOBAL; /* Global definition */
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cp++;
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}
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if (*cp == ':') {
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flags |= SYMBOLFLAG_PERMANENT;
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cp++;
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}
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cp = skipwhite(cp);
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value = parse_expr(cp, 0);
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/* Special code: if the symbol is the program counter,
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this is harder. */
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if (strcmp(label, ".") == 0) {
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if (current_pc->section->flags & PSECT_REL) {
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SYMBOL *sym;
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unsigned offset;
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/* Express the given expression as a symbol and an
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offset. The symbol must not be global, the
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section must = current. */
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if (!express_sym_offset(value, &sym, &offset)) {
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report(stack->top, "Illegal ORG\n");
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} else if ((sym->flags & (SYMBOLFLAG_GLOBAL | SYMBOLFLAG_DEFINITION)) == SYMBOLFLAG_GLOBAL) {
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report(stack->top, "Can't ORG to external location\n");
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} else if (sym->flags & SYMBOLFLAG_UNDEFINED) {
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report(stack->top, "Can't ORG to undefined sym\n");
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} else if (sym->section != current_pc->section) {
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report(stack->top, "Can't ORG to alternate section " "(use PSECT)\n");
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} else {
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DOT = sym->value + offset;
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list_value(stack->top, DOT);
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change_dot(tr, 0);
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}
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} else {
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/* If the current section is absolute, the value
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must be a literal */
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if (value->type != EX_LIT) {
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report(stack->top, "Can't ORG to non-absolute location\n");
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free_tree(value);
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free(label);
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return 0;
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}
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DOT = value->data.lit;
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list_value(stack->top, DOT);
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change_dot(tr, 0);
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}
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free_tree(value);
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free(label);
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return 1;
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}
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/* regular symbols */
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if (value->type == EX_LIT) {
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sym = add_sym(label, value->data.lit, flags, &absolute_section, &symbol_st);
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} else if (value->type == EX_SYM || value->type == EX_TEMP_SYM) {
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sym = add_sym(label, value->data.symbol->value, flags, value->data.symbol->section, &symbol_st);
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} else {
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report(stack->top, "Complex expression cannot be assigned " "to a symbol\n");
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if (!pass) {
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/* This may work better in pass 2 - something in
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RT-11 monitor needs the symbol to apear to be
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defined even if I can't resolve its value. */
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sym = add_sym(label, 0, SYMBOLFLAG_UNDEFINED, &absolute_section, &symbol_st);
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} else
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sym = NULL;
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}
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if (sym != NULL)
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list_value(stack->top, sym->value);
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free_tree(value);
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free(label);
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return sym != NULL;
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}
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/* Try to resolve macro */
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op = lookup_sym(label, ¯o_st);
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if (op /*&& op->stmtno < stmtno*/) {
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STREAM *macstr;
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free(label);
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list_location(stack->top, DOT);
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macstr = expandmacro(stack->top, (MACRO *) op, ncp);
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stack_push(stack, macstr); /* Push macro expansion
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onto input stream */
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return 1;
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}
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/* Try to resolve instruction or pseudo */
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op = lookup_sym(label, &system_st);
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if (op) {
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cp = ncp;
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free(label); /* Don't need this hanging around anymore */
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switch (op->section->type) {
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case SECTION_PSEUDO:
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switch (op->value) {
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case P_ENDR:
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case P_ENDM:
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case P_SBTTL:
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case P_LIST:
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case P_NLIST:
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case P_PRINT:
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return 1; /* Accepted, ignored. (An obvious
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need: get assembly listing
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controls working. ) */
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case P_IDENT:
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{
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char endc[6];
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int len;
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cp = skipwhite(cp);
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endc[0] = *cp++;
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endc[1] = '\n';
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endc[2] = 0;
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len = (int) strcspn(cp, endc);
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if (len > 6)
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len = 6;
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if (ident) /* An existing ident? */
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free(ident); /* Discard it. */
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ident = memcheck(malloc(len + 1));
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memcpy(ident, cp, len);
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ident[len] = 0;
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upcase(ident);
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return 1;
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}
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case P_RADIX:
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{
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int old_radix = radix;
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radix = strtoul(cp, &cp, 10);
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if (radix != 8 && radix != 10 && radix != 16 && radix != 2) {
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radix = old_radix;
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report(stack->top, "Illegal radix\n");
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return 0;
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}
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return 1;
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}
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case P_FLT4:
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case P_FLT2:
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{
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int ok = 1;
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while (!EOL(*cp)) {
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unsigned flt[4];
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if (parse_float(cp, &cp, (op->value == P_FLT4 ? 4 : 2), flt)) {
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/* Store the word values */
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store_word(stack->top, tr, 2, flt[0]);
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store_word(stack->top, tr, 2, flt[1]);
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if (op->value == P_FLT4) {
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store_word(stack->top, tr, 2, flt[2]);
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store_word(stack->top, tr, 2, flt[3]);
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}
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} else {
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report(stack->top, "Bad floating point format\n");
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ok = 0;
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}
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cp = skipdelim(cp);
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}
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return ok;
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}
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case P_ERROR:
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report(stack->top, "%.*s\n", strcspn(cp, "\n"), cp);
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return 0;
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case P_SAVE:
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if (sect_sp >= SECT_STACK_SIZE - 1) {
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report(stack->top, "Too many saved sections for .SAVE\n");
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return 0;
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}
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sect_sp++;
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sect_stack[sect_sp] = current_pc->section;
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dot_stack[sect_sp] = DOT;
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return 1;
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case P_RESTORE:
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if (sect_sp < 0) {
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report(stack->top, "No saved section for .RESTORE\n");
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return 0;
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} else {
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go_section(tr, sect_stack[sect_sp]);
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DOT = dot_stack[sect_sp];
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list_location(stack->top, DOT);
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if (!enabl_lsb) {
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lsb = get_next_lsb();
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}
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sect_sp--;
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}
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return 1;
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case P_NARG:
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{
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STREAM *str;
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MACRO_STREAM *mstr;
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int local;
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label = get_symbol(cp, &cp, &local);
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if (label == NULL) {
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report(stack->top, "Bad .NARG syntax\n");
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return 0;
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}
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/* Walk up the stream stack to find the
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topmost macro stream */
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for (str = stack->top; str != NULL && str->vtbl != ¯o_stream_vtbl;
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str = str->next) ;
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if (!str) {
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report(str, ".NARG not within macro expansion\n");
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free(label);
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return 0;
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}
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mstr = (MACRO_STREAM *) str;
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add_sym(label, mstr->nargs, SYMBOLFLAG_DEFINITION | local, &absolute_section,
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&symbol_st);
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free(label);
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list_value(stack->top, mstr->nargs);
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return 1;
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}
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case P_NCHR:
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{
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char *string;
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int local;
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label = get_symbol(cp, &cp, &local);
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if (label == NULL) {
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report(stack->top, "Bad .NCHR syntax\n");
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return 0;
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}
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cp = skipdelim(cp);
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string = getstring(cp, &cp);
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add_sym(label, strlen(string), SYMBOLFLAG_DEFINITION | local, &absolute_section,
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&symbol_st);
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free(label);
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free(string);
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return 1;
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}
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case P_NTYPE:
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{
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ADDR_MODE mode;
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int local;
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label = get_symbol(cp, &cp, &local);
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if (label == NULL) {
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report(stack->top, "Bad .NTYPE syntax\n");
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return 0;
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}
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cp = skipdelim(cp);
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if (!get_mode(cp, &cp, &mode)) {
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report(stack->top, "Bad .NTYPE addressing mode\n");
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free(label);
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return 0;
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}
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add_sym(label, mode.type, SYMBOLFLAG_DEFINITION | local, &absolute_section, &symbol_st);
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free_addr_mode(&mode);
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free(label);
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return 1;
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}
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case P_INCLUDE:
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{
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char *name = getstring_fn(cp, &cp);
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STREAM *incl;
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if (name == NULL) {
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report(stack->top, "Bad .INCLUDE file name\n");
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return 0;
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}
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incl = new_file_stream(name);
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if (incl == NULL) {
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report(stack->top, "Unable to open .INCLUDE file %s\n", name);
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free(name);
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return 0;
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}
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free(name);
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stack_push(stack, incl);
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return 1;
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}
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case P_REM:
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{
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char quote[4];
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/* Read and discard lines until one with a
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closing quote */
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cp = skipwhite(cp);
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quote[0] = *cp++;
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quote[1] = '\n';
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quote[2] = 0;
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for (;;) {
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cp += strcspn(cp, quote);
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if (*cp == quote[0])
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break; /* Found closing quote */
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cp = stack_gets(stack); /* Read next input line */
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if (cp == NULL)
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break; /* EOF */
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}
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}
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return 1;
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case P_IRP:
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{
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STREAM *str = expand_irp(stack, cp);
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if (str)
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stack_push(stack, str);
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return str != NULL;
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}
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case P_IRPC:
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{
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STREAM *str = expand_irpc(stack, cp);
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if (str)
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stack_push(stack, str);
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return str != NULL;
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}
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case P_LIBRARY:
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if (pass == 0) {
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char hitfile[FILENAME_MAX];
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char *name = getstring_fn(cp, &cp);
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my_searchenv(name, "MCALL", hitfile, sizeof(hitfile));
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if (hitfile[0]) {
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mlbs[nr_mlbs] = mlb_open(hitfile);
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if (mlbs[nr_mlbs] == NULL) {
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report(stack->top, "Unable to register macro library \"%s\"\n", hitfile);
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} else {
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nr_mlbs++;
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}
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} else {
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report(stack->top, "Unable to locale macro library \"%s\"\n", name);
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}
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free(name);
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}
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return 1;
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case P_MCALL:
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{
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STREAM *macstr;
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BUFFER *macbuf;
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char *maccp;
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int saveline;
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MACRO *mac;
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int i;
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char macfile[FILENAME_MAX];
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char hitfile[FILENAME_MAX];
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for (;;) {
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cp = skipdelim(cp);
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if (EOL(*cp))
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return 1;
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label = get_symbol(cp, &cp, NULL);
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if (!label) {
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report(stack->top, "Illegal .MCALL format\n");
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return 0;
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}
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/* See if that macro's already defined */
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if (lookup_sym(label, ¯o_st)) {
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free(label); /* Macro already
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registered. No
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prob. */
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cp = skipdelim(cp);
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continue;
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}
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/* Find the macro in the list of included
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macro libraries */
|
|
macbuf = NULL;
|
|
for (i = 0; i < nr_mlbs; i++)
|
|
if ((macbuf = mlb_entry(mlbs[i], label)) != NULL)
|
|
break;
|
|
if (macbuf != NULL) {
|
|
macstr = new_buffer_stream(macbuf, label);
|
|
buffer_free(macbuf);
|
|
} else {
|
|
strncpy(macfile, label, sizeof(macfile));
|
|
strncat(macfile, ".MAC", sizeof(macfile) - strlen(macfile) - 1);
|
|
my_searchenv(macfile, "MCALL", hitfile, sizeof(hitfile));
|
|
if (hitfile[0])
|
|
macstr = new_file_stream(hitfile);
|
|
else
|
|
macstr = NULL;
|
|
}
|
|
|
|
if (macstr != NULL) {
|
|
for (;;) {
|
|
char *mlabel;
|
|
|
|
maccp = macstr->vtbl->gets(macstr);
|
|
if (maccp == NULL)
|
|
break;
|
|
mlabel = get_symbol(maccp, &maccp, NULL);
|
|
if (mlabel == NULL)
|
|
continue;
|
|
op = lookup_sym(mlabel, &system_st);
|
|
free(mlabel);
|
|
if (op == NULL)
|
|
continue;
|
|
if (op->value == P_MACRO)
|
|
break;
|
|
}
|
|
|
|
if (maccp != NULL) {
|
|
STACK macstack = {
|
|
macstr
|
|
};
|
|
int savelist = list_level;
|
|
|
|
saveline = stmtno;
|
|
list_level = -1;
|
|
mac = defmacro(maccp, &macstack, TRUE);
|
|
if (mac == NULL) {
|
|
report(stack->top, "Failed to define macro " "called %s\n", label);
|
|
}
|
|
|
|
stmtno = saveline;
|
|
list_level = savelist;
|
|
}
|
|
|
|
macstr->vtbl->delete(macstr);
|
|
} else
|
|
report(stack->top, "MACRO %s not found\n", label);
|
|
|
|
free(label);
|
|
}
|
|
}
|
|
return 1;
|
|
|
|
case P_MACRO:
|
|
{
|
|
MACRO *mac = defmacro(cp, stack, FALSE);
|
|
|
|
return mac != NULL;
|
|
}
|
|
|
|
case P_MEXIT:
|
|
{
|
|
STREAM *macstr;
|
|
|
|
/* Pop a stream from the input. */
|
|
/* It must be the first stream, and it must be */
|
|
/* a macro, rept, irp, or irpc. */
|
|
macstr = stack->top;
|
|
if (macstr->vtbl != ¯o_stream_vtbl && macstr->vtbl != &rept_stream_vtbl
|
|
&& macstr->vtbl != &irp_stream_vtbl && macstr->vtbl != &irpc_stream_vtbl) {
|
|
report(stack->top, ".MEXIT not within a macro\n");
|
|
return 0;
|
|
}
|
|
|
|
/* and finally, pop the macro */
|
|
stack_pop(stack);
|
|
|
|
return 1;
|
|
}
|
|
|
|
case P_REPT:
|
|
{
|
|
STREAM *reptstr = expand_rept(stack, cp);
|
|
|
|
if (reptstr)
|
|
stack_push(stack, reptstr);
|
|
return reptstr != NULL;
|
|
}
|
|
|
|
case P_ENABL:
|
|
/* FIXME - add all the rest of the options. */
|
|
while (!EOL(*cp)) {
|
|
label = get_symbol(cp, &cp, NULL);
|
|
if (strcmp(label, "AMA") == 0)
|
|
enabl_ama = 1;
|
|
else if (strcmp(label, "LSB") == 0) {
|
|
enabl_lsb = 1;
|
|
lsb = get_next_lsb();
|
|
} else if (strcmp(label, "GBL") == 0) {
|
|
enabl_gbl = 1;
|
|
} else if (strcmp(label, "LC") == 0) {
|
|
enabl_lc = 1;
|
|
}
|
|
free(label);
|
|
cp = skipdelim(cp);
|
|
}
|
|
return 1;
|
|
|
|
case P_DSABL:
|
|
/* FIXME Ditto as for .ENABL */
|
|
while (!EOL(*cp)) {
|
|
label = get_symbol(cp, &cp, NULL);
|
|
if (strcmp(label, "AMA") == 0)
|
|
enabl_ama = 0;
|
|
else if (strcmp(label, "LSB") == 0) {
|
|
lsb = get_next_lsb();
|
|
enabl_lsb = 0;
|
|
} else if (strcmp(label, "GBL") == 0) {
|
|
enabl_gbl = 0;
|
|
} else if (strcmp(label, "LC") == 0) {
|
|
enabl_lc = 0;
|
|
}
|
|
free(label);
|
|
cp = skipdelim(cp);
|
|
}
|
|
return 1;
|
|
|
|
case P_LIMIT:
|
|
store_limits(stack->top, tr);
|
|
return 1;
|
|
|
|
case P_TITLE:
|
|
/* accquire module name */
|
|
if (module_name != NULL) {
|
|
free(module_name);
|
|
}
|
|
module_name = get_symbol(cp, &cp, NULL);
|
|
return 1;
|
|
|
|
case P_END:
|
|
/* Accquire transfer address */
|
|
cp = skipwhite(cp);
|
|
if (!EOL(*cp)) {
|
|
if (xfer_address)
|
|
free_tree(xfer_address);
|
|
xfer_address = parse_expr(cp, 0);
|
|
}
|
|
return 1;
|
|
|
|
case P_IFDF:
|
|
opcp = skipwhite(opcp);
|
|
cp = opcp + 3; /* Point cp at the "DF" or
|
|
"NDF" part */
|
|
/* Falls into... */
|
|
case P_IIF:
|
|
case P_IF:
|
|
{
|
|
EX_TREE *value;
|
|
int ok;
|
|
|
|
label = get_symbol(cp, &cp, NULL); /* Get condition */
|
|
cp = skipdelim(cp);
|
|
|
|
if (strcmp(label, "DF") == 0) {
|
|
value = parse_expr(cp, 1);
|
|
cp = value->cp;
|
|
ok = eval_defined(value);
|
|
free_tree(value);
|
|
} else if (strcmp(label, "NDF") == 0) {
|
|
value = parse_expr(cp, 1);
|
|
cp = value->cp;
|
|
ok = eval_undefined(value);
|
|
free_tree(value);
|
|
} else if (strcmp(label, "B") == 0 ||
|
|
strcmp(label, "NB") == 0) {
|
|
char *thing;
|
|
|
|
cp = skipwhite(cp);
|
|
if (EOL(*cp)) {
|
|
ok = 1;
|
|
} else {
|
|
char *thing, *end;
|
|
|
|
thing = getstring(cp, &cp);
|
|
end = skipwhite(thing);
|
|
ok = (*end == 0);
|
|
free(thing);
|
|
}
|
|
if (label[0] == 'N') {
|
|
ok = !ok;
|
|
}
|
|
} else if (strcmp(label, "IDN") == 0) {
|
|
char *thing1,
|
|
*thing2;
|
|
|
|
thing1 = getstring(cp, &cp);
|
|
cp = skipdelim(cp);
|
|
if (!EOL(*cp))
|
|
thing2 = getstring(cp, &cp);
|
|
else
|
|
thing2 = memcheck(strdup(""));
|
|
ok = (strcmp(thing1, thing2) == 0);
|
|
free(thing1);
|
|
free(thing2);
|
|
} else if (strcmp(label, "DIF") == 0) {
|
|
char *thing1,
|
|
*thing2;
|
|
|
|
thing1 = getstring(cp, &cp);
|
|
cp = skipdelim(cp);
|
|
if (!EOL(*cp))
|
|
thing2 = getstring(cp, &cp);
|
|
else
|
|
thing2 = memcheck(strdup(""));
|
|
ok = (strcmp(thing1, thing2) != 0);
|
|
free(thing1);
|
|
free(thing2);
|
|
} else {
|
|
int sword;
|
|
unsigned uword;
|
|
EX_TREE *value = parse_expr(cp, 0);
|
|
|
|
cp = value->cp;
|
|
|
|
if (value->type != EX_LIT) {
|
|
report(stack->top, "Bad .IF expression\n");
|
|
list_value(stack->top, 0);
|
|
free_tree(value);
|
|
ok = FALSE; /* Pick something. */
|
|
} else {
|
|
unsigned word;
|
|
|
|
/* Convert to signed and unsigned words */
|
|
sword = value->data.lit & 0x7fff;
|
|
|
|
/* FIXME I don't know if the following
|
|
is portable enough. */
|
|
if (value->data.lit & 0x8000)
|
|
sword |= ~0xFFFF; /* Render negative */
|
|
|
|
/* Reduce unsigned value to 16 bits */
|
|
uword = value->data.lit & 0xffff;
|
|
|
|
if (strcmp(label, "EQ") == 0 || strcmp(label, "Z") == 0)
|
|
ok = (uword == 0), word = uword;
|
|
else if (strcmp(label, "NE") == 0 || strcmp(label, "NZ") == 0)
|
|
ok = (uword != 0), word = uword;
|
|
else if (strcmp(label, "GT") == 0 || strcmp(label, "G") == 0)
|
|
ok = (sword > 0), word = sword;
|
|
else if (strcmp(label, "GE") == 0)
|
|
ok = (sword >= 0), word = sword;
|
|
else if (strcmp(label, "LT") == 0 || strcmp(label, "L") == 0)
|
|
ok = (sword < 0), word = sword;
|
|
else if (strcmp(label, "LE") == 0)
|
|
ok = (sword <= 0), word = sword;
|
|
|
|
list_value(stack->top, word);
|
|
|
|
free_tree(value);
|
|
}
|
|
}
|
|
|
|
free(label);
|
|
|
|
if (op->value == P_IIF) {
|
|
stmtno++; /* the second half is a
|
|
separate statement */
|
|
if (ok) {
|
|
/* The "immediate if" */
|
|
/* Only slightly tricky. */
|
|
cp = skipdelim(cp);
|
|
label = get_symbol(cp, &ncp, &local);
|
|
goto reassemble;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
push_cond(ok, stack->top);
|
|
|
|
if (!ok)
|
|
suppressed++; /* Assembly
|
|
suppressed
|
|
until .ENDC */
|
|
}
|
|
return 1;
|
|
|
|
case P_IFF:
|
|
if (last_cond < 0) {
|
|
report(stack->top, "No conditional block active\n");
|
|
return 0;
|
|
}
|
|
if (conds[last_cond].ok) /* Suppress if last cond
|
|
is true */
|
|
suppressed++;
|
|
return 1;
|
|
|
|
case P_IFT:
|
|
if (last_cond < 0) {
|
|
report(stack->top, "No conditional block active\n");
|
|
return 0;
|
|
}
|
|
if (!conds[last_cond].ok) /* Suppress if last cond
|
|
is false */
|
|
suppressed++;
|
|
return 1;
|
|
|
|
case P_IFTF:
|
|
if (last_cond < 0) {
|
|
report(stack->top, "No conditional block active\n");
|
|
return 0;
|
|
}
|
|
return 1; /* Don't suppress. */
|
|
|
|
case P_ENDC:
|
|
if (last_cond < 0) {
|
|
report(stack->top, "No conditional block active\n");
|
|
return 0;
|
|
}
|
|
|
|
pop_cond(last_cond - 1);
|
|
return 1;
|
|
|
|
case P_EVEN:
|
|
if (DOT & 1) {
|
|
list_word(stack->top, DOT, 0, 1, "");
|
|
DOT++;
|
|
change_dot(tr, 0);
|
|
}
|
|
return 1;
|
|
|
|
case P_ODD:
|
|
if (!(DOT & 1)) {
|
|
list_word(stack->top, DOT, 0, 1, "");
|
|
DOT++;
|
|
change_dot(tr, 0);
|
|
}
|
|
return 1;
|
|
|
|
case P_ASECT:
|
|
if (!enabl_lsb) {
|
|
lsb = get_next_lsb();
|
|
}
|
|
go_section(tr, &absolute_section);
|
|
list_location(stack->top, DOT);
|
|
return 1;
|
|
|
|
case P_CSECT:
|
|
case P_PSECT:
|
|
{
|
|
SYMBOL *sectsym;
|
|
SECTION *sect;
|
|
unsigned int old_flags = ~0;
|
|
int unnamed_csect = 0;
|
|
|
|
label = get_symbol(cp, &cp, NULL);
|
|
if (label == NULL) {
|
|
if (op->value == P_CSECT) {
|
|
label = memcheck(strdup(". BLK."));
|
|
unnamed_csect = 1;
|
|
} else {
|
|
label = memcheck(strdup("")); /* Allow blank */
|
|
}
|
|
}
|
|
|
|
sectsym = lookup_sym(label, §ion_st);
|
|
if (sectsym) {
|
|
sect = sectsym->section;
|
|
free(label);
|
|
old_flags = sect->flags;
|
|
} else {
|
|
sect = new_section();
|
|
sect->label = label;
|
|
sect->flags = 0;
|
|
sect->pc = 0;
|
|
sect->size = 0;
|
|
sect->type = SECTION_USER;
|
|
sections[sector++] = sect;
|
|
sectsym = add_sym(label, 0, 0, sect, §ion_st);
|
|
|
|
/* page 6-41 table 6-5 */
|
|
if (op->value == P_PSECT) {
|
|
sect->flags |= PSECT_REL;
|
|
} else if (op->value == P_CSECT) {
|
|
if (unnamed_csect) {
|
|
sect->flags |= PSECT_REL;
|
|
} else {
|
|
sect->flags |= PSECT_REL | PSECT_COM | PSECT_GBL;
|
|
}
|
|
}
|
|
}
|
|
|
|
cp = skipdelim(cp);
|
|
if (!EOL(*cp)) {
|
|
while (cp = skipdelim(cp), !EOL(*cp)) {
|
|
/* Parse section options */
|
|
label = get_symbol(cp, &cp, NULL);
|
|
if (strcmp(label, "ABS") == 0) {
|
|
sect->flags &= ~PSECT_REL; /* Not relative */
|
|
sect->flags |= PSECT_COM; /* implies common */
|
|
} else if (strcmp(label, "REL") == 0) {
|
|
sect->flags |= PSECT_REL; /* Is relative */
|
|
} else if (strcmp(label, "SAV") == 0) {
|
|
sect->flags |= PSECT_SAV; /* Is root */
|
|
} else if (strcmp(label, "NOSAV") == 0) {
|
|
sect->flags &= ~PSECT_SAV; /* Is not root */
|
|
} else if (strcmp(label, "OVR") == 0) {
|
|
sect->flags |= PSECT_COM; /* Is common */
|
|
} else if (strcmp(label, "CON") == 0) {
|
|
sect->flags &= ~PSECT_COM; /* Concatenated */
|
|
} else if (strcmp(label, "RW") == 0) {
|
|
sect->flags &= ~PSECT_RO; /* Not read-only */
|
|
} else if (strcmp(label, "RO") == 0) {
|
|
sect->flags |= PSECT_RO; /* Is read-only */
|
|
} else if (strcmp(label, "I") == 0) {
|
|
sect->flags &= ~PSECT_DATA; /* Not data */
|
|
} else if (strcmp(label, "D") == 0) {
|
|
sect->flags |= PSECT_DATA; /* data */
|
|
} else if (strcmp(label, "GBL") == 0) {
|
|
sect->flags |= PSECT_GBL; /* Global */
|
|
} else if (strcmp(label, "LCL") == 0) {
|
|
sect->flags &= ~PSECT_GBL; /* Local */
|
|
} else {
|
|
report(stack->top, "Unknown flag %s given to " ".PSECT directive\n", label);
|
|
free(label);
|
|
return 0;
|
|
}
|
|
|
|
free(label);
|
|
}
|
|
/* If a section is declared a second time, and flags
|
|
* are given, then they must be identical to the
|
|
* first time.
|
|
* See page 6-38 of AA-KX10A-TC_PDP-11_MACRO-11_Reference_Manual_May88.pdf .
|
|
*/
|
|
if (old_flags != ~0 && sect->flags != old_flags) {
|
|
/* The manual also says that any different
|
|
* flags are ignored, and an error issued.
|
|
* Apparently, that isn't true.
|
|
* Kermit seems to do this in k11cmd.mac:
|
|
* .psect $pdata ; line 16
|
|
* .psect $pdata ,ro,d,lcl,rel,con
|
|
* ; k11mac.mac, first pass only
|
|
* .psect $PDATA ,D ; line 1083
|
|
* and ends up with
|
|
* $PDATA 001074 003 (RO,D,LCL,REL,CON)
|
|
*/
|
|
|
|
/*
|
|
sect->flags = old_flags;
|
|
report(stack->top, "Program section flags not identical\n");
|
|
*/
|
|
}
|
|
}
|
|
|
|
if (!enabl_lsb) {
|
|
lsb = get_next_lsb();
|
|
}
|
|
go_section(tr, sect);
|
|
list_location(stack->top, DOT);
|
|
|
|
return 1;
|
|
} /* end PSECT code */
|
|
break;
|
|
|
|
case P_WEAK:
|
|
case P_GLOBL:
|
|
{
|
|
SYMBOL *sym;
|
|
|
|
while (!EOL(*cp)) {
|
|
/* Loop and make definitions for
|
|
comma-separated symbols */
|
|
label = get_symbol(cp, &ncp, NULL);
|
|
if (label == NULL) {
|
|
report(stack->top, "Illegal .GLOBL/.WEAK " "syntax\n");
|
|
return 0;
|
|
}
|
|
|
|
sym = lookup_sym(label, &symbol_st);
|
|
if (sym) {
|
|
sym->flags |= SYMBOLFLAG_GLOBAL | (op->value == P_WEAK ? SYMBOLFLAG_WEAK : 0);
|
|
} else
|
|
sym = add_sym(label, 0,
|
|
SYMBOLFLAG_GLOBAL | (op->value == P_WEAK ? SYMBOLFLAG_WEAK : 0),
|
|
&absolute_section, &symbol_st);
|
|
|
|
free(label);
|
|
cp = skipdelim(ncp);
|
|
}
|
|
}
|
|
return 1;
|
|
|
|
case P_WORD:
|
|
{
|
|
/* .WORD might be followed by nothing, which
|
|
is an implicit .WORD 0 */
|
|
if (EOL(*cp)) {
|
|
if (DOT & 1) {
|
|
report(stack->top, ".WORD on odd " "boundary\n");
|
|
DOT++; /* Fix it, too */
|
|
}
|
|
store_word(stack->top, tr, 2, 0);
|
|
return 1;
|
|
} else
|
|
return do_word(stack, tr, cp, 2);
|
|
}
|
|
|
|
case P_BYTE:
|
|
if (EOL(*cp)) {
|
|
/* Blank .BYTE. Same as .BYTE 0 */
|
|
store_word(stack->top, tr, 1, 0);
|
|
return 1;
|
|
} else
|
|
return do_word(stack, tr, cp, 1);
|
|
|
|
case P_BLKW:
|
|
case P_BLKB:
|
|
{
|
|
EX_TREE *value = parse_expr(cp, 0);
|
|
int ok = 1;
|
|
|
|
if (value->type != EX_LIT) {
|
|
report(stack->top, "Argument to .BLKB/.BLKW " "must be constant\n");
|
|
ok = 0;
|
|
} else {
|
|
list_value(stack->top, DOT);
|
|
DOT += value->data.lit * (op->value == P_BLKW ? 2 : 1);
|
|
change_dot(tr, 0);
|
|
}
|
|
free_tree(value);
|
|
return ok;
|
|
}
|
|
|
|
case P_ASCIZ:
|
|
case P_ASCII:
|
|
{
|
|
EX_TREE *value;
|
|
|
|
do {
|
|
cp = skipwhite(cp);
|
|
if (*cp == '<' || *cp == '^') {
|
|
/* A byte value */
|
|
value = parse_unary_expr(cp, 0);
|
|
cp = value->cp;
|
|
store_value(stack, tr, 1, value);
|
|
free_tree(value);
|
|
} else {
|
|
char quote = *cp++;
|
|
|
|
while (*cp && *cp != '\n' && *cp != quote)
|
|
store_word(stack->top, tr, 1, *cp++);
|
|
cp++; /* Skip closing quote */
|
|
}
|
|
|
|
cp = skipwhite(cp);
|
|
} while (!EOL(*cp));
|
|
|
|
if (op->value == P_ASCIZ) {
|
|
store_word(stack->top, tr, 1, 0);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
case P_RAD50:
|
|
if (DOT & 1) {
|
|
report(stack->top, ".RAD50 on odd " "boundary\n");
|
|
DOT++; /* Fix it */
|
|
}
|
|
|
|
while (!EOL(*cp)) {
|
|
char endstr[6];
|
|
int len;
|
|
char *radstr;
|
|
char *radp;
|
|
|
|
endstr[0] = *cp++;
|
|
endstr[1] = '\n';
|
|
endstr[2] = 0;
|
|
|
|
len = strcspn(cp, endstr);
|
|
radstr = memcheck(malloc(len + 1));
|
|
memcpy(radstr, cp, len);
|
|
radstr[len] = 0;
|
|
cp += len;
|
|
if (*cp && *cp != '\n')
|
|
cp++;
|
|
for (radp = radstr; *radp;) {
|
|
unsigned rad;
|
|
|
|
rad = rad50(radp, &radp);
|
|
store_word(stack->top, tr, 2, rad);
|
|
}
|
|
free(radstr);
|
|
|
|
cp = skipwhite(cp);
|
|
}
|
|
return 1;
|
|
|
|
default:
|
|
report(stack->top, "Unimplemented directive %s\n", op->label);
|
|
return 0;
|
|
} /* end switch (PSEUDO operation) */
|
|
|
|
case SECTION_INSTRUCTION:
|
|
{
|
|
/* The PC must always be even. */
|
|
if (DOT & 1) {
|
|
report(stack->top, "Instruction on odd address\n");
|
|
DOT++; /* ...and fix it... */
|
|
}
|
|
|
|
switch (op->flags & OC_MASK) {
|
|
case OC_NONE:
|
|
/* No operands. */
|
|
store_word(stack->top, tr, 2, op->value);
|
|
return 1;
|
|
|
|
case OC_MARK:
|
|
/* MARK, EMT, TRAP */ {
|
|
EX_TREE *value;
|
|
unsigned word;
|
|
|
|
cp = skipwhite(cp);
|
|
if (*cp == '#')
|
|
cp++; /* Allow the hash, but
|
|
don't require it */
|
|
value = parse_expr(cp, 0);
|
|
if (value->type != EX_LIT) {
|
|
report(stack->top, "Instruction requires " "simple literal operand\n");
|
|
word = op->value;
|
|
} else {
|
|
word = op->value | value->data.lit;
|
|
}
|
|
|
|
store_word(stack->top, tr, 2, word);
|
|
free_tree(value);
|
|
}
|
|
return 1;
|
|
|
|
case OC_1GEN:
|
|
/* One general addressing mode */ {
|
|
ADDR_MODE mode;
|
|
unsigned word;
|
|
|
|
if (!get_mode(cp, &cp, &mode)) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
return 0;
|
|
}
|
|
|
|
if (op->value == 0100 && (mode.type & 07) == 0) {
|
|
report(stack->top, "JMP Rn is illegal\n");
|
|
/* But encode it anyway... */
|
|
}
|
|
|
|
/* Build instruction word */
|
|
word = op->value | mode.type;
|
|
store_word(stack->top, tr, 2, word);
|
|
mode_extension(tr, &mode, stack->top);
|
|
}
|
|
return 1;
|
|
|
|
case OC_2GEN:
|
|
/* Two general addressing modes */ {
|
|
ADDR_MODE left,
|
|
right;
|
|
unsigned word;
|
|
|
|
if (!get_mode(cp, &cp, &left)) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
return 0;
|
|
}
|
|
|
|
cp = skipwhite(cp);
|
|
if (*cp++ != ',') {
|
|
report(stack->top, "Illegal syntax\n");
|
|
free_addr_mode(&left);
|
|
return 0;
|
|
}
|
|
|
|
if (!get_mode(cp, &cp, &right)) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_addr_mode(&left);
|
|
return 0;
|
|
}
|
|
|
|
/* Build instruction word */
|
|
word = op->value | left.type << 6 | right.type;
|
|
store_word(stack->top, tr, 2, word);
|
|
mode_extension(tr, &left, stack->top);
|
|
mode_extension(tr, &right, stack->top);
|
|
}
|
|
return 1;
|
|
|
|
case OC_BR:
|
|
/* branches */ {
|
|
EX_TREE *value;
|
|
unsigned offset;
|
|
|
|
value = parse_expr(cp, 0);
|
|
cp = value->cp;
|
|
|
|
/* Relative PSECT or absolute? */
|
|
if (current_pc->section->flags & PSECT_REL) {
|
|
SYMBOL *sym = NULL;
|
|
|
|
/* Can't branch unless I can
|
|
calculate the offset. */
|
|
|
|
/* You know, I *could* branch
|
|
between sections if I feed the
|
|
linker a complex relocation
|
|
expression to calculate the
|
|
offset. But I won't. */
|
|
|
|
if (!express_sym_offset(value, &sym, &offset)
|
|
|| sym->section != current_pc->section) {
|
|
report(stack->top, "Bad branch target (%s)\n",
|
|
sym ? "not same section"
|
|
: "can't express offset");
|
|
store_word(stack->top, tr, 2, op->value);
|
|
free_tree(value);
|
|
return 0;
|
|
}
|
|
|
|
/* Compute the branch offset and
|
|
check for addressability */
|
|
offset += sym->value;
|
|
offset -= DOT + 2;
|
|
} else {
|
|
if (value->type != EX_LIT) {
|
|
report(stack->top, "Bad branch target (not literal; ABS section)\n");
|
|
store_word(stack->top, tr, 2, op->value);
|
|
free_tree(value);
|
|
return 0;
|
|
}
|
|
|
|
offset = value->data.lit - (DOT + 2);
|
|
}
|
|
|
|
if (!check_branch(stack, offset, -256, 255))
|
|
offset = 0;
|
|
|
|
/* Emit the branch code */
|
|
offset &= 0777; /* Reduce to 9 bits */
|
|
offset >>= 1; /* Shift to become
|
|
word offset */
|
|
|
|
store_word(stack->top, tr, 2, op->value | offset);
|
|
|
|
free_tree(value);
|
|
}
|
|
return 1;
|
|
|
|
case OC_SOB:
|
|
{
|
|
EX_TREE *value;
|
|
unsigned reg;
|
|
unsigned offset;
|
|
|
|
value = parse_expr(cp, 0);
|
|
cp = value->cp;
|
|
|
|
reg = get_register(value);
|
|
free_tree(value);
|
|
if (reg == NO_REG) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
return 0;
|
|
}
|
|
|
|
cp = skipwhite(cp);
|
|
if (*cp++ != ',') {
|
|
report(stack->top, "Illegal syntax\n");
|
|
return 0;
|
|
}
|
|
|
|
value = parse_expr(cp, 0);
|
|
cp = value->cp;
|
|
|
|
/* Relative PSECT or absolute? */
|
|
if (current_pc->section->flags & PSECT_REL) {
|
|
SYMBOL *sym;
|
|
|
|
if (!express_sym_offset(value, &sym, &offset)) {
|
|
report(stack->top, "Bad branch target (can't express offset)\n");
|
|
free_tree(value);
|
|
return 0;
|
|
}
|
|
/* Must be same section */
|
|
if (sym->section != current_pc->section) {
|
|
report(stack->top, "Bad branch target (different section)\n");
|
|
free_tree(value);
|
|
offset = 0;
|
|
} else {
|
|
/* Calculate byte offset */
|
|
offset += DOT + 2;
|
|
offset -= sym->value;
|
|
}
|
|
} else {
|
|
if (value->type != EX_LIT) {
|
|
report(stack->top, "Bad branch target (not a literal)\n");
|
|
offset = 0;
|
|
} else {
|
|
offset = DOT + 2 - value->data.lit;
|
|
}
|
|
}
|
|
|
|
if (!check_branch(stack, offset, 0, 126))
|
|
offset = 0;
|
|
|
|
offset &= 0177; /* Reduce to 7 bits */
|
|
offset >>= 1; /* Shift to become word offset */
|
|
store_word(stack->top, tr, 2, op->value | offset | (reg << 6));
|
|
|
|
free_tree(value);
|
|
}
|
|
return 1;
|
|
|
|
case OC_ASH:
|
|
/* First op is gen, second is register. */ {
|
|
ADDR_MODE mode;
|
|
EX_TREE *value;
|
|
unsigned reg;
|
|
unsigned word;
|
|
|
|
if (!get_mode(cp, &cp, &mode)) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
return 0;
|
|
}
|
|
|
|
cp = skipwhite(cp);
|
|
if (*cp++ != ',') {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_addr_mode(&mode);
|
|
return 0;
|
|
}
|
|
value = parse_expr(cp, 0);
|
|
cp = value->cp;
|
|
|
|
reg = get_register(value);
|
|
if (reg == NO_REG) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_tree(value);
|
|
free_addr_mode(&mode);
|
|
return 0;
|
|
}
|
|
|
|
/* Instruction word */
|
|
word = op->value | mode.type | (reg << 6);
|
|
store_word(stack->top, tr, 2, word);
|
|
mode_extension(tr, &mode, stack->top);
|
|
free_tree(value);
|
|
}
|
|
return 1;
|
|
|
|
case OC_JSR:
|
|
/* First op is register, second is gen. */ {
|
|
ADDR_MODE mode;
|
|
EX_TREE *value;
|
|
unsigned reg;
|
|
unsigned word;
|
|
|
|
value = parse_expr(cp, 0);
|
|
cp = value->cp;
|
|
|
|
reg = get_register(value);
|
|
if (reg == NO_REG) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_tree(value);
|
|
return 0;
|
|
}
|
|
|
|
cp = skipwhite(cp);
|
|
if (*cp++ != ',') {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
return 0;
|
|
}
|
|
|
|
if (!get_mode(cp, &cp, &mode)) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_tree(value);
|
|
return 0;
|
|
}
|
|
word = op->value | mode.type | (reg << 6);
|
|
store_word(stack->top, tr, 2, word);
|
|
mode_extension(tr, &mode, stack->top);
|
|
free_tree(value);
|
|
}
|
|
return 1;
|
|
|
|
case OC_1REG:
|
|
/* One register (RTS) */ {
|
|
EX_TREE *value;
|
|
unsigned reg;
|
|
|
|
value = parse_expr(cp, 0);
|
|
cp = value->cp;
|
|
reg = get_register(value);
|
|
if (reg == NO_REG) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_tree(value);
|
|
reg = 0;
|
|
}
|
|
|
|
store_word(stack->top, tr, 2, op->value | reg);
|
|
free_tree(value);
|
|
}
|
|
return 1;
|
|
|
|
case OC_1FIS:
|
|
/* One one gen and one reg 0-3 */ {
|
|
ADDR_MODE mode;
|
|
EX_TREE *value;
|
|
unsigned reg;
|
|
unsigned word;
|
|
|
|
if (!get_mode(cp, &cp, &mode)) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
return 0;
|
|
}
|
|
|
|
cp = skipwhite(cp);
|
|
if (*cp++ != ',') {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_addr_mode(&mode);
|
|
return 0;
|
|
}
|
|
|
|
value = parse_expr(cp, 0);
|
|
cp = value->cp;
|
|
|
|
reg = get_register(value);
|
|
if (reg == NO_REG || reg > 4) {
|
|
report(stack->top, "Invalid destination register\n");
|
|
reg = 0;
|
|
}
|
|
|
|
word = op->value | mode.type | (reg << 6);
|
|
store_word(stack->top, tr, 2, word);
|
|
mode_extension(tr, &mode, stack->top);
|
|
free_tree(value);
|
|
}
|
|
return 1;
|
|
|
|
case OC_2FIS:
|
|
/* One reg 0-3 and one gen */ {
|
|
ADDR_MODE mode;
|
|
EX_TREE *value;
|
|
unsigned reg;
|
|
unsigned word;
|
|
int ok = 1;
|
|
|
|
value = parse_expr(cp, 0);
|
|
cp = value->cp;
|
|
|
|
reg = get_register(value);
|
|
if (reg == NO_REG || reg > 4) {
|
|
report(stack->top, "Illegal source register\n");
|
|
reg = 0;
|
|
ok = 0;
|
|
}
|
|
|
|
cp = skipwhite(cp);
|
|
if (*cp++ != ',') {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_tree(value);
|
|
return 0;
|
|
}
|
|
|
|
if (!get_mode(cp, &cp, &mode)) {
|
|
report(stack->top, "Illegal addressing mode\n");
|
|
free_tree(value);
|
|
return 0;
|
|
}
|
|
|
|
word = op->value | mode.type | (reg << 6);
|
|
store_word(stack->top, tr, 2, word);
|
|
mode_extension(tr, &mode, stack->top);
|
|
free_tree(value);
|
|
}
|
|
return 1;
|
|
|
|
default:
|
|
report(stack->top, "Unimplemented instruction format\n");
|
|
return 0;
|
|
} /* end(handle an instruction) */
|
|
}
|
|
break;
|
|
} /* end switch(section type) */
|
|
} /* end if (op is a symbol) */
|
|
}
|
|
|
|
/* Only thing left is an implied .WORD directive */
|
|
/*JH: fall through in case of illegal opcode, illegal label! */
|
|
free(label);
|
|
|
|
return do_word(stack, tr, cp, 2);
|
|
}
|
|
|
|
int get_next_lsb(
|
|
void)
|
|
{
|
|
if (lsb_used) {
|
|
lsb_used = 0;
|
|
if (enabl_debug && lstfile) {
|
|
fprintf(lstfile, "get_next_lsb: lsb: %d becomes %d (= next_lsb)\n", lsb, next_lsb);
|
|
}
|
|
return next_lsb++;
|
|
} else {
|
|
if (enabl_debug && lstfile) {
|
|
fprintf(lstfile, "get_next_lsb: lsb: stays %d\n", lsb);
|
|
}
|
|
return lsb;
|
|
}
|
|
}
|
|
|
|
/* assemble_stack assembles the input stack. It returns the error
|
|
count. */
|
|
|
|
int assemble_stack(
|
|
STACK *stack,
|
|
TEXT_RLD *tr)
|
|
{
|
|
int res;
|
|
int errcount = 0;
|
|
|
|
while ((res = assemble(stack, tr)) >= 0) {
|
|
list_flush();
|
|
if (res == 0)
|
|
errcount++; /* Count an error */
|
|
}
|
|
|
|
return errcount;
|
|
}
|