Unverified Commit a89757da authored by Alex Guo's avatar Alex Guo Committed by Palmer Dabbelt
Browse files

RISC-V: implement __lshrti3. 



Signed-off-by: default avatarAlex Guo <xfguo@jlsemi.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
parent 4938c79b

arch/riscv/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -26,6 +26,9 @@ ifeq ($(CONFIG_ARCH_RV64I),y) 


	KBUILD_CFLAGS += -mabi=lp64

	KBUILD_AFLAGS += -mabi=lp64

	

	KBUILD_CFLAGS	+= $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128)



	KBUILD_MARCH = rv64im

	LDFLAGS += -melf64lriscv

else

arch/riscv/lib/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,5 +2,6 @@ lib-y += delay.o 
lib-y	+= memcpy.o

lib-y	+= memset.o

lib-y	+= uaccess.o

lib-y	+= tishift.o



lib-$(CONFIG_32BIT) += udivdi3.o

arch/riscv/lib/tishift.S

0 → 100644
+42 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2018 Free Software Foundation, Inc.

 *

 *   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, version 2.

 *

 *   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.

 */

  .globl __lshrti3

__lshrti3:

  beqz  a2, .L1

  li    a5,64

  sub   a5,a5,a2

  addi  sp,sp,-16

  sext.w a4,a5

  blez  a5, .L2

  sext.w a2,a2

  sll   a4,a1,a4

  srl   a0,a0,a2

  srl   a1,a1,a2

  or    a0,a0,a4

  sd    a1,8(sp)

  sd    a0,0(sp)

  ld    a0,0(sp)

  ld    a1,8(sp)

  addi  sp,sp,16

  ret

.L1:

  ret

.L2:

  negw  a4,a4

  srl   a1,a1,a4

  sd    a1,0(sp)

  sd    zero,8(sp)

  ld    a0,0(sp)

  ld    a1,8(sp)

  addi  sp,sp,16

  ret