Subversion Repositories openrisc_2011-10-31

/*

 * cf-hosted.S --

 *

 * Copyright (c) 2006 CodeSourcery Inc

 *

 * 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.

 */

/* Semihosting function.  The debugger intercepts the halt, and

   determines that it is followed by the sentinel pattern. */

        .globl __hosted

__hosted:

        linkw %fp,#0

        movel %fp@(8),%d0

        movel %fp@(12),%d1

        /* The semihosting sequence is 'nop; halt;sentinel' aligned to

           a 4 byte boundary.  The sentinel is an ill formed instruction

           (movec %sp,0).  The debugger will adjust the pc, so it is never

            executed.  */

        .balignw 4,0x4e71

        nop

        halt

        .long 0x4e7bf000

        unlk %fp

        rts