# HG changeset patch
# User lost
# Date 1230867329 0
# Node ID 674ee393426cda0b9e4d407ca013da249ed73e68
# Parent 7c6b8bdf8c5c5c7ef1a374e2a49e7a660c35b3c0
Added handler for TFM instructions
diff -r 7c6b8bdf8c5c -r 674ee393426c src/insn_tfm.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/insn_tfm.c Fri Jan 02 03:35:29 2009 +0000
@@ -0,0 +1,111 @@
+/*
+insn_tfm.c
+Copyright © 2008 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 .
+*/
+
+/*
+for handling inherent mode instructions
+*/
+
+#define __insn_inh_c_seen__
+
+#include
+#include
+
+#include "lwasm.h"
+#include "instab.h"
+
+OPFUNC(insn_tfm)
+{
+ static const char *reglist = "DXYUS AB 00EF";
+ int r0, r1;
+ char *c;
+ int tfm = 0;
+
+ c = strchr(reglist, toupper(*(*p)++));
+ if (!c)
+ {
+ register_error(as, l, 1, "Unknown operation");
+ return;
+ }
+ r0 = c - reglist;
+ if (**p == '+')
+ {
+ (*p)++;
+ tfm = 1;
+ }
+ else if (**p == '-')
+ {
+ (*p)++;
+ tfm = 2;
+ }
+ if (*(*p)++ != ',')
+ {
+ register_error(as, l, 1, "Unknown operation");
+ return;
+ }
+ c = strchr(reglist, toupper(*(*p)++));
+ if (!c)
+ {
+ register_error(as, l, 1, "Unknown operation");
+ return;
+ }
+ r1 = c - reglist;
+
+ if (**p == '+')
+ {
+ (*p)++;
+ tfm |= 4;
+ }
+ else if (**p == '-')
+ {
+ (*p)++;
+ tfm |= 8;
+ }
+
+ if (**p && !isspace(**p))
+ {
+ register_error(as, l, 1, "Bad operand");
+ return;
+ }
+
+ // valid values of tfm here are:
+ // 1: r0+,r1 (2)
+ // 4: r0,r1+ (3)
+ // 5: r0+,r1+ (0)
+ // 10: r0-,r1- (1)
+ switch (tfm)
+ {
+ case 5: //r0+,r1+
+ lwasm_emitop(as, l, instab[opnum].ops[0]);
+ break;
+ case 10: //r0-,r1-
+ lwasm_emitop(as, l, instab[opnum].ops[1]);
+ break;
+ case 1: // r0+,r1
+ lwasm_emitop(as, l, instab[opnum].ops[2]);
+ break;
+ case 4: // r0,r1+
+ lwasm_emitop(as, l, instab[opnum].ops[3]);
+ break;
+ default:
+ register_error(as, l, 1, "Unknown operation");
+ return;
+ }
+ lwasm_emit(as, l, (r0 << 4) | r1);
+}