Subversion Repositories openrisc_2011-10-31

/*
 * fido-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
        .align 4
        nop
        bkpt #0
        
        /* This sentinel instruction value must be immediately after
           the bkpt instruction.  The debugger will adjust the pc, so
           that it is never executed.  This instruction is
           'movec %sp,0'.  */
        .long 0x4e7bf000
        unlk %fp
        rts