arch/arm/lib/muldi3.S

   1 /*
   2  *  linux/arch/arm/lib/muldi3.S
   3  *
   4  *  Author:     Nicolas Pitre
   5  *  Created:    Oct 19, 2005
   6  *  Copyright:  Monta Vista Software, Inc.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/linkage.h>
  14 #include <asm/assembler.h>
  15
  16 #ifdef __ARMEB__
  17 #define xh r0
  18 #define xl r1
  19 #define yh r2
  20 #define yl r3
  21 #else
  22 #define xl r0
  23 #define xh r1
  24 #define yl r2
  25 #define yh r3
  26 #endif
  27
  28 ENTRY(__muldi3)
  29 ENTRY(__aeabi_lmul)
  30
  31         mul     xh, yl, xh
  32         mla     xh, xl, yh, xh
  33         mov     ip, xl, lsr #16
  34         mov     yh, yl, lsr #16
  35         bic     xl, xl, ip, lsl #16
  36         bic     yl, yl, yh, lsl #16
  37         mla     xh, yh, ip, xh
  38         mul     yh, xl, yh
  39         mul     xl, yl, xl
  40         mul     ip, yl, ip
  41         adds    xl, xl, yh, lsl #16
  42         adc     xh, xh, yh, lsr #16
  43         adds    xl, xl, ip, lsl #16
  44         adc     xh, xh, ip, lsr #16
  45         ret     lr
  46
  47 ENDPROC(__muldi3)
  48 ENDPROC(__aeabi_lmul)