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changeset 361:105393e31f20

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Generic memory mode insns
author lost@starbug
date Thu, 01 Apr 2010 20:44:57 -0600
parents 7d91ab7ac7d6
children 4867f18c872f
files lwasm/Makefile.am lwasm/insn_gen.c lwasm/lwasm.h
diffstat 3 files changed, 436 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/lwasm/Makefile.am	Thu Apr 01 18:39:40 2010 -0600
+++ b/lwasm/Makefile.am	Thu Apr 01 20:44:57 2010 -0600
@@ -3,7 +3,7 @@
 lwasm_SOURCES = main.c pragma.c input.c pass1.c lwasm.c \
 	instab.c symbol.c macro.c \
 	insn_inh.c insn_rtor.c insn_tfm.c insn_rlist.c insn_rel.c \
-	insn_bitbit.c insn_indexed.c \
+	insn_bitbit.c insn_indexed.c insn_gen.c \
 	pseudo.c section.c os9.c
 lwasm_LDADD = -L$(top_builddir)/lib -L$(top_srcdir)/lib -L$(top_builddir)/lwlib -L$(top_srcdir)/lwlib -lgnu -llw
 EXTRA_DIST =  lwasm.h input.h instab.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lwasm/insn_gen.c	Thu Apr 01 20:44:57 2010 -0600
@@ -0,0 +1,434 @@
+/*
+insn_gen.c, Copyright © 2009 William Astle
+
+This file is part of LWASM.
+
+LWASM is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+more details.
+
+You should have received a copy of the GNU General Public License along with
+this program. If not, see <http://www.gnu.org/licenses/>.
+
+Contains code for parsing general addressing modes (IMM+DIR+EXT+IND)
+*/
+
+#include <config.h>
+
+#include <ctype.h>
+#include <stdlib.h>
+
+#include <lw_expr.h>
+
+#include "lwasm.h"
+#include "instab.h"
+
+extern void insn_indexed_parse_aux(asmstate_t *as, line_t *l, char **p);
+extern void insn_indexed_resolve_aux(asmstate_t *as, line_t *l, int force);
+extern void insn_indexed_emit_aux(asmstate_t *as, line_t *l);
+
+// "extra" is required due to the way OIM, EIM, TIM, and AIM work
+void insn_parse_gen_aux(asmstate_t *as, line_t *l, char **p)
+{
+	const char *optr2;
+	int v1, tv, rval;
+	lw_expr_t *s;
+
+	optr2 = *p;
+	while (*optr2 && !isspace(*optr2) && *optr2 != ',') optr2++
+		/* do nothing */ ;
+
+	if (*optr2 == ',' || **p == '[')
+	{
+		l -> lint = -1;
+		l -> lint2 = 1;
+		insn_parse_indexed_aux(as, l, p);
+		goto out;
+	}
+
+	if (**p == '<')
+	{
+		(*p)++;
+		l -> lint2 = 0;
+	}
+
+	// for compatibility with asxxxx
+	// * followed by a digit, alpha, or _, or ., or ?, or another * is "f8"
+	else if (**p == '*')
+	{
+		tv = *(*p + 1);
+		if (isdigit(tv) || isalpha(tv) || tv == '_' || tv == '.' || tv == '?' || tv == '@' || tv == '*' || tv == '+' || tv == '-')
+		{
+			l -> lint2 = 0;
+			(*p)++;
+		}
+	}
+	else if (**p == '>')
+	{
+		(*p)++;
+		l -> lint2 = 2;
+	}
+	else
+	{
+		l -> lint2 = -1;
+	}
+
+	s = lwasm_parse_expr(as, p);
+	if (!s)
+	{
+		lwasm_register_error(as, l, "Bad operand");
+		return;
+	}
+	
+	lwasm_save_expr(l, 0, s);
+
+	if (as -> output_format == OUTPUT_OBJ && l -> lint2 == -1)
+	{
+		l -> lint2 = 2;
+		goto out;
+	}
+
+	// if we have a constant now, figure out dp vs nondp
+	if (lw_expr_istype(s, lw_expr_type_int))
+	{
+		v1 = lw_expr_intval(s);
+		if (((v1 >> 8) & 0xff) == (l -> dpval & 0xff))
+		{
+			l -> lint2 = 0;
+			goto out;
+		}
+		l -> lint2 = 2;
+	}
+
+out:
+	if (l -> lint2 != -1)
+	{
+		if (l -> lint2 == 0)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
+		}
+		else if (l -> lint2 == 2)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
+		}
+		else if (l -> lint2 == 1 && l -> lint != -1)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
+		}
+	}
+}
+
+void insn_resolve_gen_aux(asmstate_t *as, line_t *l, int force)
+{
+	lw_expr_t *e;
+	
+	if (l -> lint2 == 1)
+	{
+		// indexed
+		insn_resolve_indexed_aux(as, l, force);
+		goto out;
+	}
+	
+	if (l -> lint2 != -1)
+		return;
+	
+	e = lwasm_fetch_expr(l, 0);
+	if (lw_expr_istype(e, lw_expr_type_int))
+	{
+		int v;
+		
+		v = lw_expr_intval(e);
+
+		if (((v >> 8) & 0xff) == (l -> dpval & 0xff))
+		{
+			l -> lint2 = 0;
+			goto out;
+		}
+		l -> lint2 = 2;
+		goto out;
+	}
+
+	if (force)
+	{
+		l -> lint2 = 2;
+	}
+
+out:
+	if (l -> lint2 != -1)
+	{
+		if (l -> lint2 == 0)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
+		}
+		else if (l -> lint2 == 2)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
+		}
+		else if (l -> lint2 == 1 && l -> lint != -1)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
+		}
+	}
+}
+
+void insn_emit_gen_aux(asmstate_t *as, line_t *l)
+{
+	lw_expr_t e;
+	
+	e = lwasm_fetch_expr(l, 0);
+	lwasm_emitop(l, instab[l -> insn].ops[l -> lint2]);
+	if (l, l -> lint2 == 1)
+	{
+		lwasm_emit(l, l -> pb);
+		lwasm_emitexpr(l, e, l -> lint);
+		return;
+	}
+	
+	if (l -> lint2 == 2)
+		lwasm_emitexpr(l, e, 2);
+	else
+		lwasm_emitexpr(l, e, 1);
+}
+
+// the various insn_gen? functions have an immediate mode of ? bits
+PARSEFUNC(insn_parse_gen0)
+{
+	if (**p == '#')
+	{
+		lwasm_register_error(as, l, "Immediate mode not allowed");
+		return;
+	}
+	
+	// handle non-immediate
+	insn_parse_gen_aux(as, l, p);
+}
+
+RESOLVEFUNC(insn_resolve_gen0)
+{
+	if (l -> len != -1)
+		return;
+
+	// handle non-immediate
+	insn_resolve_gen_aux(as, l, force);
+}
+
+EMITFUNC(insn_emit_gen0)
+{
+	insn_emit_gen_aux(as, l);
+}
+
+PARSEFUNC(insn_parse_gen8)
+{
+	if (**p == '#')
+	{
+		lw_expr_t e;
+		
+		(*p)++;
+		e = lwasm_parse_expr(as, p);
+		if (!e)
+		{
+			lwasm_register_error(as, l, "Bad operand");
+			return;
+		}
+		l -> len = OPLEN(instab[l -> insn].ops[3]) + 1;
+		l -> lint2 = 3;
+		lwasm_save_expr(l, 0, e);
+		return;
+	}
+	
+	// handle non-immediate
+	insn_parse_gen_aux(as, l, p);
+	if (l -> lint2 != -1)
+	{
+		if (l -> lint2 == 0)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
+		}
+		else if (l -> lint2 == 2)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
+		}
+		else if (l -> lint2 == 1 && l -> lint != -1)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
+		}
+	}
+}
+
+RESOLVEFUNC(insn_resolve_gen8)
+{
+	if (l -> len != -1)
+		return;
+
+	// handle non-immediate
+	insn_resolve_gen_aux(as, l, force);
+}
+
+EMITFUNC(insn_emit_gen8)
+{
+	if (l -> lint2 == 3)
+	{
+		lw_expr_t e;
+		e = lwasm_fetch_expr(l, 0);
+		lwasm_emitop(l, instab[l -> insn].ops[3]);
+		lwasm_emitexpr(l, e, 1);
+		return;
+	}
+
+	insn_emit_gen_aux(as, l);
+}
+
+PARSEFUNC(insn_parse_gen16)
+{
+	if (**p == '#')
+	{
+		lw_expr_t e;
+		
+		(*p)++;
+		e = lwasm_parse_expr(as, p);
+		if (!e)
+		{
+			lwasm_register_error(as, l, "Bad operand");
+			return;
+		}
+		l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
+		l -> lint2 = 3;
+		lwasm_save_expr(l, 0, e);
+		return;
+	}
+	
+	// handle non-immediate
+	insn_parse_gen_aux(as, l, p);
+	if (l -> lint2 != -1)
+	{
+		if (l -> lint2 == 0)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
+		}
+		else if (l -> lint2 == 2)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
+		}
+		else if (l -> lint2 == 1 && l -> lint != -1)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
+		}
+	}
+}
+
+RESOLVEFUNC(insn_resolve_gen16)
+{
+	if (l -> len != -1)
+		return;
+
+	// handle non-immediate
+	insn_resolve_gen_aux(as, l, force);
+}
+
+EMITFUNC(insn_emit_gen16)
+{
+	if (l -> lint2 == 3)
+	{
+		lw_expr_t e;
+		e = lwasm_fetch_expr(l, 0);
+		lwasm_emitop(l, instab[l -> insn].ops[3]);
+		lwasm_emitexpr(l, e, 2);
+		return;
+	}
+
+	insn_emit_gen_aux(as, l);
+}
+
+PARSEFUNC(insn_parse_gen32)
+{
+	if (**p == '#')
+	{
+		lw_expr_t e;
+		
+		(*p)++;
+		e = lwasm_parse_expr(as, p);
+		if (!e)
+		{
+			lwasm_register_error(as, l, "Bad operand");
+			return;
+		}
+		l -> len = OPLEN(instab[l -> insn].ops[3]) + 4;
+		l -> lint2 = 3;
+		lwasm_save_expr(l, 0, e);
+		return;
+	}
+	
+	// handle non-immediate
+	insn_parse_gen_aux(as, l, p);
+	if (l -> lint2 != -1)
+	{
+		if (l -> lint2 == 0)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
+		}
+		else if (l -> lint2 == 2)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
+		}
+		else if (l -> lint2 == 1 && l -> lint != -1)
+		{
+			l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
+		}
+	}
+}
+
+RESOLVEFUNC(insn_resolve_gen32)
+{
+	if (l -> len != -1)
+		return;
+
+	// handle non-immediate
+	insn_resolve_gen_aux(as, l, force);
+}
+
+EMITFUNC(insn_emit_gen32)
+{
+	if (l -> lint2 == 3)
+	{
+		lw_expr_t e;
+		e = lwasm_fetch_expr(l, 0);
+		lwasm_emitop(l, instab[l -> insn].ops[3]);
+		lwasm_emitexpr(l, e, 4);
+		return;
+	}
+
+	insn_emit_gen_aux(as, l);
+}
+
+PARSEFUNC(insn_parse_imm8)
+{
+	lw_expr_t e;
+	
+	if (**p == '#')
+	{
+		(*p)++;
+
+		e = lwasm_parse_expr(as, p);
+		if (!e)
+		{
+			lwasm_register_error(as, l, "Bad operand");
+			return;
+		}
+		l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
+		lwasm_save_expr(l, 0, e);
+	}
+}
+
+EMITFUNC(insn_emit_imm8)
+{
+	lw_expr_t e;
+	
+	lwasm_emitop(l, instab[l -> insn].ops[0]);
+	lwasm_emitexpr(l, e, 1);
+}
--- a/lwasm/lwasm.h	Thu Apr 01 18:39:40 2010 -0600
+++ b/lwasm/lwasm.h	Thu Apr 01 20:44:57 2010 -0600
@@ -140,6 +140,7 @@
 	char *lstr;							// string passed forward
 	int pb;								// pass forward post byte
 	int lint;							// pass forward integer
+	int lint2;							// another pass forward integer
 	asmstate_t *as;						// assembler state data ptr
 	int pragmas;						// pragmas in effect for the line
 };