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: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Stuart Menefy 2009-08-24 17:09:53 +09:00 committed by Paul Mundt
parent d724a9c9d5
commit fea966f756
5 changed files with 7 additions and 6 deletions

View File

@ -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

View File

@ -7,7 +7,7 @@
.endm
.macro sti
mov #0xf0, r11
mov #0xfffffff0, r11
extu.b r11, r11
not r11, r11
stc sr, r10

View File

@ -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

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@ -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

View File

@ -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 ]