sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 945 insertions, 0 deletions

diff --git a/sdas/as8xcxxx/ds8mch.c b/sdas/as8xcxxx/ds8mch.c
new file mode 100644
index 0000000..1fe4bf4
--- /dev/null
+++ b/sdas/as8xcxxx/ds8mch.c
@@ -0,0 +1,945 @@
+/* ds8mch.c */
+
+/*
+ *  Copyright (C) 1998-2009  Alan R. Baldwin
+ *
+ *  This program 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/>.
+ *
+ *
+ * Alan R. Baldwin
+ * 721 Berkeley St.
+ * Kent, Ohio  44240
+ *
+ *   This Assember Ported by
+ *      jhartman at compuserve dot com
+ *      noice at noicedebugger dot com
+ *
+ *   Modified from i51pst.c
+ *      Bill McKinnon
+ *      w_mckinnon at conknet dot com
+ *
+ */
+
+#include "asxxxx.h"
+#include "ds8.h"
+
+char    *cpu    = "Dallas Semiconductor [User Defined]";
+char    *dsft   = "asm";
+
+static int amode;
+static char buff[80];
+static int ds8_bytes;
+static int mchtyp;
+
+/*
+ * Opcode Cycle Definitions
+ */
+#define OPCY_SDP        ((char) (0xFF))
+#define OPCY_ERR        ((char) (0xFE))
+
+/*      OPCY_NONE       ((char) (0x80)) */
+/*      OPCY_MASK       ((char) (0x7F)) */
+
+#define OPCY_CPU        ((char) (0xFD))
+#define OPCY_AMODE      ((char) (0xFC))
+#define OPCY_BITS       ((char) (0xFB))
+
+
+#define UN      ((char) (OPCY_NONE | 0x00))
+
+/*
+ * ds8xcxxx Cycle Count
+ *
+ *      opcycles = ds8pg1[opcode]
+ */
+static char ds8pg1[256] = {
+/*--*--* 0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F */
+/*--*--* -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  - */
+/*00*/   4,12,16, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*10*/  12,12,16, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*20*/  12,12,16, 4, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*30*/  12,12,16, 4, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*40*/  12,12, 8,12, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*50*/  12,12, 8,12, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*60*/  12,12, 8,12, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*70*/  12,12, 8,12, 8,12, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+/*80*/  12,12, 8,12,20,12, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+/*90*/  12,12, 8,12, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*A0*/   8,12, 8,12,20,UN, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+/*B0*/   8,12, 8, 4,16,16,16,16,16,16,16,16,16,16,16,16,
+/*C0*/   8,12, 8, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*D0*/   8,12, 8, 4, 4,16, 4, 4,12,12,12,12,12,12,12,12,
+/*E0*/   8,12, 8, 8, 4, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+/*F0*/   8,12, 8, 8, 4, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
+};
+
+/*
+ * Process machine ops.
+ */
+VOID
+machine(struct mne *mp)
+{
+        char *p, *str;
+        char pid[NINPUT], id[NINPUT];
+        int c, d, t, t1, v1;
+        a_uint op;
+        struct sym *sp;
+        struct expr e, e1, e2;
+
+        clrexpr(&e);
+        clrexpr(&e1);
+        clrexpr(&e2);
+
+        op = mp->m_valu;
+        switch (mp->m_type) {
+
+        case S_CPU:
+                opcycles = OPCY_CPU;
+                lmode = SLIST;
+                switch(op) {
+                default: op = DS8XCXXX;
+                case DS8XCXXX: v1 = 2; str = "DS8XCXXX"; sym[2].s_addr = X_DS8XCXXX; break;
+                case DS80C310: v1 = 2; str = "DS80C310"; sym[2].s_addr = X_DS80C310; break;
+                case DS80C320: v1 = 2; str = "DS80C320"; sym[2].s_addr = X_DS80C320; break;
+                case DS80C323: v1 = 2; str = "DS80C323"; sym[2].s_addr = X_DS80C323; break;
+                case DS80C390: v1 = 3; str = "DS80C390"; sym[2].s_addr = X_DS80C390; break;
+                case DS83C520: v1 = 2; str = "DS83C520"; sym[2].s_addr = X_DS83C520; break;
+                case DS83C530: v1 = 2; str = "DS83C530"; sym[2].s_addr = X_DS83C530; break;
+                case DS83C550: v1 = 2; str = "DS83C550"; sym[2].s_addr = X_DS83C550; break;
+                case DS87C520: v1 = 2; str = "DS87C520"; sym[2].s_addr = X_DS87C520; break;
+                case DS87C530: v1 = 2; str = "DS87C530"; sym[2].s_addr = X_DS87C530; break;
+                case DS87C550: v1 = 2; str = "DS87C550"; sym[2].s_addr = X_DS87C550; break;
+                case DS______: v1 = 2; str = "DS______"; sym[2].s_addr = X_DS______;
+                        if (more()) {
+                                str = p = pid;
+                                d = getnb();
+                                while ((c = get()) != d) {
+                                        if (c == '\0') {
+                                                qerr();
+                                        }
+                                        if (p < &pid[sizeof(pid)-3]) {
+                                                *p++ = c;
+                                        } else {
+                                                break;
+                                        }
+                                }
+                                *p = 0;
+                        }
+                        break;
+                }
+                if (op != 0) {
+                        ds8_bytes = v1;
+                        exprmasks(v1);
+                }
+                mchtyp = (int) op;
+
+                sprintf(id, "__%s", str);
+                sp = lookup(id);
+                if (sp->s_type != S_NEW && (sp->s_flag & S_ASG) == 0) {
+                        err('m');
+                }
+                sp->s_type = S_USER;
+                sp->s_addr = 1;
+                sp->s_flag |= S_ASG;
+
+                sprintf(buff, "%s %s", DS_CPU, str);
+                cpu = buff;
+
+                sp = lookup("__SFR_BITS");
+                if (sp->s_type != S_NEW && (sp->s_flag & S_ASG) == 0) {
+                        err('m');
+                }
+                sp->s_type = S_USER;
+                sp->s_flag |= S_ASG;
+
+                if (more()) {
+                        expr(&e, 0);
+                        abscheck(&e);
+                        sp->s_addr = e.e_addr;
+                } else {
+                        sp->s_addr = 1;
+                }
+                break;
+
+        case S_AMODE:
+                opcycles = OPCY_AMODE;
+                if ((mchtyp != 0) && (mchtyp != DS80C390)) {
+                        err('o');
+                        break;
+                } else
+                if ((mchtyp == 0) && ((a_bytes < 2) || (a_bytes > 3))) {
+                        err('o');
+                        break;
+                }
+                expr(&e, 0);
+                abscheck(&e);
+                amode = (int) e.e_addr;
+                if ((amode < 0) || (amode > 2)) {
+                        amode = 0;
+                        err('o');
+                }
+                if ((c = getnb()) == ',') {
+                        expr(&e1, 0);
+                        abscheck(&e1);
+                        if (e1.e_addr != 0) {
+/* mov  ta,#0aah */             outab(0x075);   outab(0x0C7);   outab(0x0AA);
+/* mov  ta,#055h */             outab(0x075);   outab(0x0C7);   outab(0x055);
+/* mov  acon,#amode */          outab(0x075);   outab(0x09D);   outab(amode);
+                        } else {
+                                lmode = SLIST;
+                        }
+                } else {
+                        unget(c);
+                        lmode = SLIST;
+                }
+                break;
+
+        case S_BITS:
+                if (ds8_bytes == 0) {
+                        ds8_bytes = (int) op;
+                        exprmasks(ds8_bytes);
+                } else
+                if (ds8_bytes != (int) op) {
+                        err('m');
+                }
+                opcycles = OPCY_BITS;
+                lmode = SLIST;
+                break;
+
+        case S_INH:
+                outab(op);
+                break;
+
+        case S_JMP11:
+                expr(&e, 0);
+                if (amode == 2) {
+                        outr3bm(&e, R_J19, op);
+                } else {
+                        outrwm(&e, R_J11, op);
+                }
+                break;
+
+        case S_JMP16:
+                expr(&e, 0);
+                outab(op);
+                if (amode == 2) {
+                        outr3b(&e, R_NORM);
+                } else {
+                        outrw(&e, R_NORM);
+                }
+                break;
+
+        case S_ACC:
+                t = addr(&e);
+                if (t != S_A)
+                        aerr();
+                outab(op);
+                break;
+
+        case S_TYP1:
+                /* A, direct, @R0, @R1, R0 to R7.  "INC" also allows DPTR */
+                t = addr(&e);
+
+                switch (t) {
+                case S_A:
+                        outab(op + 4);
+                        break;
+
+                case S_DIR:
+                case S_EXT:
+                        /* Direct is also legal */
+                        outab(op + 5);
+                        outrb(&e, R_PAG0);
+                        break;
+
+                case S_AT_R:
+                        outab(op + 6 + e.e_addr);
+                        break;
+
+                case S_REG:
+                        outab(op + 8 + e.e_addr);
+                        break;
+
+                case S_DPTR:
+                        if (op != 0)
+                                /* only INC (op=0) has DPTR mode */
+                                aerr();
+                        else
+                                outab( 0xA3);
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        case S_TYP2:
+                /* A,#imm; A,direct; A,@R0; A,@R1; A,R0 to A,R7 */
+                t = addr(&e);
+                if (t != S_A)
+                        aerr();
+                comma(1);
+                t1 = addr(&e1);
+
+                switch (t1) {
+                case S_IMMED:
+                        outab(op + 4);
+                        outrb(&e1, R_NORM);
+                        break;
+
+                case S_DIR:
+                case S_EXT:
+                        outab(op + 5);
+                        outrb(&e1, R_PAG0);
+                        break;
+
+                case S_AT_R:
+                        outab(op + 6 + e1.e_addr);
+                        break;
+
+                case S_REG:
+                        outab(op + 8 + (e1.e_addr));
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        case S_TYP3:
+                /* dir,A; dir,#imm;
+                 * A,#imm; A,direct; A,@R0; A,@R1; A,R0 to A,R7
+                 * C,direct;  C,/direct
+                 */
+                t = addr(&e);
+                comma(1);
+                t1 = addr(&e1);
+
+                switch (t) {
+                case S_DIR:
+                case S_EXT:
+                        switch (t1) {
+                        case S_A:
+                                outab(op + 2);
+                                outrb(&e, R_PAG0);
+                                break;
+
+                        case S_IMMED:
+                                outab(op + 3);
+                                outrb(&e, R_PAG0);
+                                outrb(&e1, R_NORM);
+                                break;
+
+                        default:
+                                aerr();
+                        }
+                        break;
+
+                case S_A:
+                        switch (t1) {
+                        case S_IMMED:
+                                outab(op + 4);
+                                outrb(&e1, R_NORM);
+                                break;
+
+                        case S_DIR:
+                        case S_EXT:
+                                outab(op + 5);
+                                outrb(&e1, R_PAG0);
+                                break;
+
+                        case S_AT_R:
+                                outab(op + 6 + e1.e_addr);
+                                break;
+
+                        case S_REG:
+                                outab(op + 8 + e1.e_addr);
+                                break;
+
+                        default:
+                                aerr();
+                        }
+                        break;
+
+                case S_C:
+                        /* XRL has no boolean version.  Trap it */
+                        if (op == 0x60)
+                                aerr();
+
+                        switch (t1) {
+                        case S_DIR:
+                        case S_EXT:
+                                outab(op + 0x32);
+                                outrb(&e1, R_PAG0);
+                                break;
+
+                        case S_NOT_BIT:
+                                outab(op + 0x60);
+                                outrb(&e1, R_PAG0);
+                                break;
+
+                        default:
+                                aerr();
+                        }
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        case S_TYP4:
+                /* A,direct; A,@R0; A,@R1; A,R0 to A,R7 */
+                t = addr(&e);
+                if (t != S_A)
+                        aerr();
+                comma(1);
+                t1 = addr(&e1);
+
+                switch (t1) {
+                case S_DIR:
+                case S_EXT:
+                        outab(op + 5);
+                        outrb(&e1, R_PAG0);
+                        break;
+
+                case S_AT_R:
+                        outab(op + 6 + e1.e_addr);
+                        break;
+
+                case S_REG:
+                        outab(op + 8 + e1.e_addr);
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        /* MOV instruction, all modes */
+        case S_MOV:
+                t = addr(&e);
+                comma(1);
+                t1 = addr(&e1);
+
+                switch (t) {
+                case S_A:
+                        switch (t1) {
+                        case S_IMMED:
+                                outab(0x74);
+                                outrb(&e1, R_NORM);
+                                break;
+
+                        case S_DIR:
+                        case S_EXT:
+                                outab(0xE5);
+                                outrb(&e1, R_PAG0);
+                                break;
+
+                        case S_AT_R:
+                                outab(0xE6 + e1.e_addr);
+                                break;
+
+                        case S_REG:
+                                outab(0xE8 + e1.e_addr);
+                                break;
+
+                        default:
+                                aerr();
+                        }
+                        break;
+
+                case S_REG:
+                        switch (t1) {
+                        case S_A:
+                                outab(0xF8 + e.e_addr);
+                                break;
+
+                        case S_IMMED:
+                                outab(0x78 + e.e_addr);
+                                outrb(&e1, R_NORM);
+                                break;
+
+                        case S_DIR:
+                        case S_EXT:
+                                outab(0xA8 + e.e_addr);
+                                outrb(&e1, R_PAG0);
+                                break;
+
+                        default:
+                                aerr();
+                        }
+                        break;
+
+                case S_DIR:
+                case S_EXT:
+                        switch (t1) {
+                        case S_A:
+                                outab(0xF5);
+                                outrb(&e, R_PAG0);
+                                break;
+
+                        case S_IMMED:
+                                outab(0x75);
+                                outrb(&e, R_PAG0);
+                                outrb(&e1, R_NORM);
+                                break;
+
+                        case S_DIR:
+                        case S_EXT:
+                                outab(0x85);
+                                outrb(&e1, R_PAG0);
+                                outrb(&e, R_PAG0);
+                                break;
+
+                        case S_AT_R:
+                                outab(0x86 + e1.e_addr);
+                                outrb(&e, R_PAG0);
+                                break;
+
+                        case S_REG:
+                                outab(0x88 + e1.e_addr);
+                                outrb(&e, R_PAG0);
+                                break;
+
+                        case S_C:
+                                outab(0x92);
+                                outrb(&e, R_PAG0);
+                                break;
+
+                        default:
+                                aerr();
+                        }
+                        break;
+
+                case S_AT_R:
+                        switch (t1) {
+                        case S_IMMED:
+                                outab(0x76 + e.e_addr);
+                                outrb(&e1, R_NORM);
+                                break;
+
+                        case S_DIR:
+                        case S_EXT:
+                                outab(0xA6 + e.e_addr);
+                                outrb(&e1, R_PAG0);
+                                break;
+
+                        case S_A:
+                                outab(0xF6 + e.e_addr);
+                                break;
+
+                        default:
+                                aerr();
+                        }
+                        break;
+
+                case S_C:
+                        if ((t1 != S_DIR) && (t1 != S_EXT))
+                                aerr();
+                        outab(0xA2);
+                        outrb(&e1, R_PAG0);
+                        break;
+
+                case S_DPTR:
+                        if (t1 != S_IMMED)
+                                aerr();
+                        outab(0x90);
+                        if (amode == 2)
+                                outr3b(&e1, R_NORM);
+                        else
+                                outrw(&e1, R_NORM);
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        case S_BITBR:   /* JB, JBC, JNB bit,rel */
+                /* Branch on bit set/clear */
+                t = addr(&e);
+                if ((t != S_DIR) && (t != S_EXT))
+                        aerr();
+                /* sdcc svn rev #4994: fixed bug 1865114 */
+                comma(1);
+                expr(&e1, 0);
+
+                outab(op);
+                outrb(&e, R_PAG0);
+
+                if (mchpcr(&e1)) {
+                        v1 = (int) (e1.e_addr - dot.s_addr - 1);
+                        /* sdcc svn rev #602: Fix some path problems */
+                        if (pass == 2 && ((v1 < -128) || (v1 > 127)))
+                                aerr();
+                        outab(v1);
+                } else {
+                        outrb(&e1, R_PCR);
+                }
+                if (e1.e_mode != S_USER)
+                        rerr();
+                break;
+
+        case S_BR:  /* JC, JNC, JZ, JNZ */
+                /* Relative branch */
+                /* sdcc svn rev #4994: fixed bug 1865114 */
+                expr(&e1, 0);
+                outab(op);
+
+                if (mchpcr(&e1)) {
+                        v1 = (int) (e1.e_addr - dot.s_addr - 1);
+                        /* sdcc svn rev #602: Fix some path problems */
+                        if (pass == 2 && ((v1 < -128) || (v1 > 127)))
+                                aerr();
+                        outab(v1);
+                } else {
+                        outrb(&e1, R_PCR);
+                }
+                if (e1.e_mode != S_USER)
+                        rerr();
+                break;
+
+        case S_CJNE:
+                /* A,#;  A,dir;  @R0,#;  @R1,#;  Rn,# */
+                t = addr(&e);
+                comma(1);
+                t1 = addr(&e1);
+
+                /* Benny */
+                comma(1);
+                expr(&e2, 0);
+
+                switch (t) {
+                case S_A:
+                        if (t1 == S_IMMED) {
+                                outab(op + 4);
+                                outrb(&e1, R_NORM);
+                        }
+                        else if ((t1 == S_DIR) || (t1 == S_EXT)) {
+                                outab(op + 5);
+                                outrb(&e1, R_PAG0);
+                        }
+                        else
+                                aerr();
+                        break;
+
+                case S_AT_R:
+                        outab(op + 6 + e.e_addr);
+                        if (t1 != S_IMMED)
+                                aerr();
+                        outrb(&e1, R_NORM);
+                        break;
+
+                case S_REG:
+                        outab(op + 8 + e.e_addr);
+                        if (t1 != S_IMMED)
+                                aerr();
+                        outrb(&e1, R_NORM);
+                        break;
+
+                default:
+                        aerr();
+                        break;
+                }
+
+                /* branch destination */
+                if (mchpcr(&e2)) {
+                        v1 = (int) (e2.e_addr - dot.s_addr - 1);
+                        /* sdcc svn rev #602: Fix some path problems */
+                        if (pass == 2 && ((v1 < -128) || (v1 > 127)))
+                                aerr();
+                        outab(v1);
+                } else {
+                        outrb(&e2, R_PCR);
+                }
+                if (e2.e_mode != S_USER)
+                        rerr();
+                break;
+
+        case S_DJNZ:
+                /* Dir,dest;  Reg,dest */
+                t = addr(&e);
+                /* sdcc svn rev #4994: fixed bug 1865114 */
+                comma(1);
+                expr(&e1, 0);
+
+                switch (t) {
+                case S_DIR:
+                case S_EXT:
+                        outab(op + 5);
+                        outrb(&e, R_PAG0);
+                        break;
+
+                case S_REG:
+                        outab(op + 8 + e.e_addr);
+                        break;
+
+                default:
+                        aerr();
+                }
+
+                /* branch destination */
+                /* sdcc svn rev #4994: fixed bug 1865114 */
+                if (mchpcr(&e1)) {
+                        v1 = (int) (e1.e_addr - dot.s_addr - 1);
+                        /* sdcc svn rev #602: Fix some path problems */
+                        if (pass == 2 && ((v1 < -128) || (v1 > 127)))
+                                aerr();
+                        outab(v1);
+                } else {
+                        outrb(&e1, R_PCR);
+                }
+                if (e1.e_mode != S_USER)
+                        rerr();
+                break;
+
+        case S_JMP:
+                /* @A+DPTR */
+                t = addr(&e);
+                if (t != S_AT_ADP)
+                        aerr();
+                outab(op);
+                break;
+
+        case S_MOVC:
+                /* A,@A+DPTR  A,@A+PC */
+                t = addr(&e);
+                if (t != S_A)
+                        aerr();
+                comma(1);
+                t1 = addr(&e1);
+                if (t1 == S_AT_ADP)
+                        outab(0x93);
+                else if (t1 == S_AT_APC)
+                        outab(0x83);
+                else
+                        aerr();
+                break;
+
+        case S_MOVX:
+                /* A,@DPTR  A,@R0  A,@R1  @DPTR,A  @R0,A  @R1,A */
+                t = addr(&e);
+                comma(1);
+                t1 = addr(&e1);
+
+                switch (t) {
+                case S_A:
+                        switch (t1) {
+                        case S_AT_DP:
+                                outab(0xE0);
+                                break;
+
+                        case S_AT_R:
+                                outab(0xE2 + e1.e_addr);
+                                break;
+
+                        default:
+                                aerr();
+                        }
+                        break;
+
+                case S_AT_DP:
+                        if (t1 == S_A)
+                                outab(0xF0);
+                        else
+                                aerr();
+                        break;
+
+                case S_AT_R:
+                        if (t1 == S_A)
+                                outab(0xF2 + e.e_addr);
+                        else
+                                aerr();
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        /* MUL/DIV A,B */
+        case S_AB:
+                t = addr(&e);
+                if (t != S_RAB)
+                        aerr();
+                outab(op);
+                break;
+
+        /* CLR or CPL:  A, C, or bit */
+        case S_ACBIT:
+                t = addr(&e);
+                switch (t) {
+                case S_A:
+                        if (op == 0xB2)
+                                outab(0xF4);
+                        else
+                                outab(0xE4);
+                        break;
+
+                case S_C:
+                        outab(op+1);
+                        break;
+
+                case S_DIR:
+                case S_EXT:
+                        outab(op);
+                        outrb(&e, R_PAG0);
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        /* SETB C or bit */
+        case S_SETB:
+                t = addr(&e);
+                switch (t) {
+                case S_C:
+                        outab(op+1);
+                        break;
+
+                case S_DIR:
+                case S_EXT:
+                        outab(op);
+                        outrb(&e, R_PAG0);
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        /* direct */
+        case S_DIRECT:
+                t = addr(&e);
+                if (t == S_A) {
+                        e.e_addr = 0xE0;
+                        e.e_mode = S_DIR;
+                } else
+                if ((t != S_DIR) && (t != S_EXT)) {
+                        aerr();
+                        break;
+                }
+                outab(op);
+                outrb(&e, R_PAG0);
+                break;
+
+        /* XCHD A,@Rn */
+        case S_XCHD:
+                t = addr(&e);
+                if (t != S_A)
+                        aerr();
+                comma(1);
+                t1 = addr(&e1);
+                switch (t1) {
+                case S_AT_R:
+                        outab(op + e1.e_addr);
+                        break;
+
+                default:
+                        aerr();
+                }
+                break;
+
+        default:
+                opcycles = OPCY_ERR;
+                err('o');
+                break;
+        }
+        if (opcycles == OPCY_NONE) {
+                opcycles = ds8pg1[cb[0] & 0xFF];
+        }
+}
+
+/*
+ * Branch/Jump PCR Mode Check
+ */
+int
+mchpcr(struct expr *esp)
+{
+        if (esp->e_base.e_ap == dot.s_area) {
+                return(1);
+        }
+        if (esp->e_flag==0 && esp->e_base.e_ap==NULL) {
+                /*
+                 * Absolute Destination
+                 *
+                 * Use the global symbol '.__.ABS.'
+                 * of value zero and force the assembler
+                 * to use this absolute constant as the
+                 * base value for the relocation.
+                 */
+                esp->e_flag = 1;
+                esp->e_base.e_sp = &sym[1];
+        }
+        return(0);
+}
+
+/*
+ * Machine specific initialization
+ */
+
+VOID
+minit(void)
+{
+        struct sym      *sp;
+        struct PreDef   *pd;
+        int i;
+        char pid[8];
+        char *p;
+
+        /*
+         * Byte Order
+         */
+        hilo = 1;
+
+        amode = 0;
+        /*
+         * First time only:
+         *      add the pre-defined symbols to the table
+         *      as local symbols.
+         */
+        if (pass == 0) {
+                ds8_bytes = 0;
+                mchtyp = X_DS8XCXXX;
+                sym[2].s_addr = X_DS8XCXXX;
+
+                pd = preDef;
+                while (pd->id) {
+                        strcpy(pid, pd->id);
+                        for (i=0; i<2; i++) {
+                                /*
+                                 * i == 0,  Create Upper Case Symbols
+                                 * i == 1,  Create Lower Case Symbols
+                                 */
+                                if (i == 1) {
+                                        p = pid;
+                                        while (*p) {
+                                                *p = ccase[*p & 0x007F];
+                                                p++;
+                                        }
+                                }
+                                sp = lookup(pid);
+                                if (sp->s_type == S_NEW) {
+                                        sp->s_addr = pd->value;
+                                        sp->s_type = S_USER;
+                                        sp->s_flag = S_LCL | S_ASG;
+                                }
+                        }
+                        pd++;
+                }
+        }
+}