Commit 2f56fc13 authored by Mao Minkai's avatar Mao Minkai Committed by guzitao
Browse files

sw64: clear .bss section using memset() 

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5XTGY



--------------------------------

Signed-off-by: default avatarMao Minkai <maominkai@wxiat.com>
Reviewed-by: default avatarHe Sheng <hesheng@wxiat.com>
Signed-off-by: default avatarGu Zitao <guzitao@wxiat.com>
parent b7e7080b

arch/sw_64/kernel/head.S

+5 −17
Original line number Diff line number Diff line
@@ -26,23 +26,11 @@ __start: 
	/* ... and find our stack ... */

	ldi	$30, ASM_THREAD_SIZE($8)

	/* ... and then we can clear bss data.  */

	ldi	$2, __bss_start

	ldi	$3, __bss_stop

	/* 8 bytes alignment */

1:	and	$2, 0x7, $1	# align check

	bne	$1, 3f

2:	subl	$3, $2, $1	# align clear

	ble	$1, 4f

	subl	$1, 0x8, $1

	ble	$1, 3f

	stl	$31, 0($2)

	addl	$2, 8, $2

	br	$31, 2b

3:	stb	$31, 0($2)	# non align clear

	addl	$2, 1, $2

	subl	$3, $2, $1

	bgt	$1, 1b

4:# finish clear

	ldi	$16, __bss_start

	ldi	$18, __bss_stop

	subl	$18, $16, $18

	mov	$31, $17

	call	$26, __constant_c_memset

#ifdef CONFIG_RELOCATABLE

	ldi	$30, -8($30)

	stl	$29, 0($30)