Subversion Repositories openrisc

/*
 * 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