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/*

 * mbx-outbyte.c -- outbyte function for targets using the eppcbug monitor

 *

 * Copyright (c) 1998 Cygnus Support

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

#include "ppc-asm.h"

static int sendbyte(char c)

{

    struct {

        unsigned clun;

        unsigned dlun;

        char     *data;

        unsigned len;

        unsigned rsrvd;

        char     buf[4];

    } ipb, *inpb;

    struct {

        int status;

        int cnt;

    } opb, *outpb;

    inpb = &ipb;

    outpb = &opb;

    inpb->clun = 0;

    inpb->dlun = 0;

    inpb->data = ipb.buf;

    inpb->len  = 1;

    inpb->rsrvd = 0;

    inpb->buf[0] = c;

    asm volatile (

        "mr  3,%0\n"

        "mr  4,%1\n"

        "li  10,0x201\n"

        "sc"

        : /* no outputs */

        : "r" (inpb), "r" (outpb)

        : "3", "4", "10"

    );

    return (outpb->status == 0 && outpb->cnt == 1);

}

#define GDB_QUOTE_OUTBYTES 1

void outbyte(char c)

{

#ifdef GDB_QUOTE_OUTBYTES

    /*

     *  GDB monitor.c will echo characters quoted with ^O

     */

    while (!sendbyte('\017')) ;

#endif

    while (!sendbyte(c)) ;

}