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ARM: entry: shark: don't directly reference registers in macros

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Directly referencing registers in macros makes assembly code harder
to change, because the macros have side effects which are non-obvious.
Use the provided 'base' register rather than directly referencing r4.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-06-26 10:04:15 +01:00
parent b6fcd313c9
commit 2342aa282b
1 changed files with 5 additions and 5 deletions
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10
arch/arm/mach-shark/include/mach/entry-macro.S
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@ -11,17 +11,17 @@
.endm
.macro get_irqnr_preamble, base, tmp
mov \base, #0xe0000000
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
mov r4, #0xe0000000
mov \irqstat, #0x0C
strb \irqstat, [r4, #0x20] @outb(0x0C, 0x20) /* Poll command */
ldrb \irqnr, [r4, #0x20] @irq = inb(0x20) & 7
strb \irqstat, [\base, #0x20] @outb(0x0C, 0x20) /* Poll command */
ldrb \irqnr, [\base, #0x20] @irq = inb(0x20) & 7
and \irqstat, \irqnr, #0x80
teq \irqstat, #0
beq 43f
@ -29,8 +29,8 @@
teq \irqnr, #2
bne 44f
43: mov \irqstat, #0x0C
strb \irqstat, [r4, #0xa0] @outb(0x0C, 0xA0) /* Poll command */
ldrb \irqnr, [r4, #0xa0] @irq = (inb(0xA0) & 7) + 8
strb \irqstat, [\base, #0xa0] @outb(0x0C, 0xA0) /* Poll command */
ldrb \irqnr, [\base, #0xa0] @irq = (inb(0xA0) & 7) + 8
and \irqstat, \irqnr, #0x80
teq \irqstat, #0
beq 44f