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Viewing changes to libc/string/memmove.S

  • Committer: Bazaar Package Importer
  • Author(s): Hakan Ardo
  • Date: 2006-05-01 12:03:39 UTC
  • mto: (3.1.1 edgy)
  • mto: This revision was merged to the branch mainline in revision 4.
  • Revision ID: james.westby@ubuntu.com-20060501120339-q93dxulpunby36dj
Tags: upstream-1.4.4
Import upstream version 1.4.4

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libc/string/memmove.S
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  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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  POSSIBILITY OF SUCH DAMAGE. */
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/* $Id: memmove.S,v 1.6 2005/10/30 19:36:53 aesok Exp $ */
 
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#include "macros.inc"
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#define dest_hi r25
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    \returns The memmove() function returns a pointer to dest.  */
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#if !defined(DOXYGEN)
 
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#if !defined(__DOXYGEN__)
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        .extern _U(memcpy)
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        .text
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; otherwise memcpy will do the right thing
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        cp      src_lo, dest_lo
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        cpc     src_hi, dest_hi
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        brcc    .memmove_fwd
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        LOAD_Z(src_lo, src_hi)
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        LOAD_X(dest_lo, dest_hi)
 
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        brcc    .L_memmove_fwd
 
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        X_movw  ZL, src_lo
 
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        X_movw  XL, dest_lo
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        add     ZL, len_lo
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        adc     ZH, len_hi
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        add     XL, len_lo
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        adc     XH, len_hi
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        rjmp    .memmove_start
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.memmove_loop:
 
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        rjmp    .L_memmove_start
 
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.L_memmove_loop:
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        ld      __tmp_reg__, -Z
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        st      -X, __tmp_reg__
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.memmove_start:
 
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.L_memmove_start:
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        subi    len_lo, lo8(1)
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        sbci    len_hi, hi8(1)
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        brcc    .memmove_loop
 
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        brcc    .L_memmove_loop
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; return dest (unchanged)
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        ret
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.memmove_fwd:
 
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.L_memmove_fwd:
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        XJMP    _U(memcpy)
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.memmove_end:
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        .size   _U(memmove), .memmove_end - _U(memmove)
 
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.L_memmove_end:
 
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        .size   _U(memmove), .L_memmove_end - _U(memmove)
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#endif /* not DOXYGEN */
 
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#endif /* not __DOXYGEN__ */