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Commit fea966f7 authored by Stuart Menefy's avatar Stuart Menefy Committed by Paul Mundt
Browse files

sh: Remove implicit sign extension from assembler immediates 



The SH instruction set has several instructions which accept an 8 bit
immediate operand. For logical instructions this operand is zero extended,
for arithmetic instructions the operand is sign extended. After adding an
option to the assembler to check this, it was found that several pieces
of assembly code were assuming this behaviour, and in one case
getting it wrong.

So this patch explicitly sign extends any immediate operands, which makes
it obvious what is happening, and fixes the one case which got it wrong.

Signed-off-by: default avatarStuart Menefy <stuart.menefy@st.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent d724a9c9

arch/sh/boot/compressed/head_32.S

+1 −1
Original line number Diff line number Diff line
@@ -22,7 +22,7 @@ startup: 
	bt	clear_bss

	sub	r0, r2

	mov.l	bss_start_addr, r0

	mov	#0xe0, r1

	mov	#0xffffffe0, r1

	and	r1, r0			! align cache line

	mov.l	text_start_addr, r3

	mov	r0, r1

arch/sh/include/asm/entry-macros.S

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
	.endm



	.macro	sti

	mov	#0xf0, r11

	mov	#0xfffffff0, r11

	extu.b	r11, r11

	not	r11, r11

	stc	sr, r10

arch/sh/kernel/cpu/sh3/entry.S

+1 −1
Original line number Diff line number Diff line
@@ -257,7 +257,7 @@ restore_all: 
	!

	! Calculate new SR value

	mov	k3, k2			! original SR value

	mov	#0xf0, k1

	mov	#0xfffffff0, k1

	extu.b	k1, k1

	not	k1, k1

	and	k1, k2			! Mask original SR value

arch/sh/kernel/entry-common.S

+3 −2
Original line number Diff line number Diff line
@@ -98,8 +98,9 @@ need_resched: 


	mov	#OFF_SR, r0

	mov.l	@(r0,r15), r0		! get status register

	and	#0xf0, r0		! interrupts off (exception path)?

	cmp/eq	#0xf0, r0

	shlr	r0

	and	#(0xf0>>1), r0		! interrupts off (exception path)?

	cmp/eq	#(0xf0>>1), r0

	bt	noresched

	mov.l	3f, r0

	jsr	@r0			! call preempt_schedule_irq

arch/sh/lib/clear_page.S

+1 −1
Original line number Diff line number Diff line
@@ -57,7 +57,7 @@ ENTRY(clear_page) 
ENTRY(__clear_user)

	!

	mov	#0, r0

	mov	#0xe0, r1	! 0xffffffe0

	mov	#0xffffffe0, r1

	!

	! r4..(r4+31)&~32 	   -------- not aligned	[ Area 0 ]

	! (r4+31)&~32..(r4+r5)&~32 -------- aligned	[ Area 1 ]