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Add __ashrdi3 and remove link to libgcc 

In a previous patch, Sascha needed to add __ashrdi3 and then linked
to libgcc. This patch add the ashrdi3 function in the arch/openrisc/lib
directory and remove the libgcc dependency.

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Franck Jullien 2012-09-13 00:28:32 +02:00 committed by Sascha Hauer
parent 8b3bf5971a
commit 9a5963dfd8
3 changed files with 60 additions and 4 deletions
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4
arch/openrisc/Makefile
View File

@ -1,7 +1,5 @@
CPPFLAGS += -D__OR1K__ -ffixed-r10 -mhard-mul -mhard-div
LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
board-$(CONFIG_GENERIC) := generic
KALLSYMS += --symbol-prefix=_
@ -20,6 +18,4 @@ common-y += $(BOARD)
common-y += arch/openrisc/lib/
common-y += arch/openrisc/cpu/
common-y += $(LIBGCC)
lds-y += arch/openrisc/cpu/barebox.lds

1
arch/openrisc/lib/Makefile
View File

@ -4,3 +4,4 @@ obj-y += cpuinfo.o
obj-y += muldi3.o
obj-y += lshrdi3.o
obj-y += ashldi3.o
obj-y += ashrdi3.o

59
arch/openrisc/lib/ashrdi3.S Normal file
View File

@ -0,0 +1,59 @@
/*
* (C) Copyright 2012 - Franck JULLIEN <elec4fun@gmail.com>
*
* Extracted from gcc generated assembly.
*
* Extended precision shifts.
*
* R3/R4 (MSW, LSW) has 64 bit value
* R5 has shift count
* result in R11/R12
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
.globl __ashrdi3
__ashrdi3:
l.sfeqi r5,0x0 /* if count = 0, go out */
l.bf out
l.addi r6,r0,0x20 /* r6 = 32 */
l.sub r6,r6,r5 /* r6 = 32 - count */
l.sfgtsi r6,0x0 /* if count >= 32 */
l.bnf more_than_32 /* branch to more_than_32 */
l.nop 0x0
less_than_32:
l.sll r6,r3,r6 /* r6 gets the bits moved from MSW to LSW */
l.srl r4,r4,r5 /* shift LSW */
l.sra r5,r3,r5 /* shift MSW to r5 */
l.or r4,r6,r4 /* LSW gets bits shifted from MSW */
l.ori r3,r5,0x0 /* r3 = MSW */
out:
l.ori r11,r3,0x0
l.jr r9
l.ori r12,r4,0x0
more_than_32:
l.srai r5,r3,0x1f /* r5 = MSW sign extended */
l.sub r4,r0,r6 /* r4 = -r6, the number of bits above 32 */
l.sra r4,r3,r4 /* LSW gets bits shifted from MSB */
l.j out /* go out */
l.ori r3,r5,0x0 /* r3 = MSW */