mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-26 14:40:41 +00:00
46 lines
1.3 KiB
ArmAsm
46 lines
1.3 KiB
ArmAsm
|
/*
|
||
|
|
* This code was copied from arch/powerpc/kernel/misc_32.S in the Linux
|
||
|
|
* kernel sources (commit 85e2efbb1db9a18d218006706d6e4fbeb0216213, also
|
||
|
|
* known as 2.6.38-rc5). The source file copyrights are as follows:
|
||
|
|
*
|
||
|
|
* (C) Copyright 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
||
|
|
*
|
||
|
|
* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
|
||
|
|
* and Paul Mackerras.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License as
|
||
|
|
* published by the Free Software Foundation; either version 2 of
|
||
|
|
* the License, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <ppc_asm.tmpl>
|
||
|
|
#include <ppc_defs.h>
|
||
|
|
#include <config.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Extended precision shifts.
|
||
|
|
*
|
||
|
|
* Updated to be valid for shift counts from 0 to 63 inclusive.
|
||
|
|
* -- Gabriel
|
||
|
|
*
|
||
|
|
* R3/R4 has 64 bit value
|
||
|
|
* R5 has shift count
|
||
|
|
* result in R3/R4
|
||
|
|
*
|
||
|
|
* ashrdi3: arithmetic right shift (sign propagation)
|
||
|
|
* lshrdi3: logical right shift
|
||
|
|
* ashldi3: left shift
|
||
|
|
*/
|
||
|
|
.globl __ashldi3
|
||
|
|
__ashldi3:
|
||
|
|
subfic r6,r5,32
|
||
|
|
slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count
|
||
|
|
addi r7,r5,32 # could be xori, or addi with -32
|
||
|
|
srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count)
|
||
|
|
slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32)
|
||
|
|
or r3,r3,r6 # MSW |= t1
|
||
|
|
slw r4,r4,r5 # LSW = LSW << count
|
||
|
|
or r3,r3,r7 # MSW |= t2
|
||
|
|
blr
|