From: Russell King Date: Sun, 26 Jun 2011 09:04:15 +0000 (+0100) Subject: ARM: entry: shark: don't directly reference registers in macros X-Git-Tag: upstream/snapshot3+hdmi~9566^2~1^3~21 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2342aa282b59f028cf0850b483b34587db2c22b0;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git ARM: entry: shark: don't directly reference registers in macros 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 --- diff --git a/arch/arm/mach-shark/include/mach/entry-macro.S b/arch/arm/mach-shark/include/mach/entry-macro.S index e2853c0..0bb6cc6 100644 --- a/arch/arm/mach-shark/include/mach/entry-macro.S +++ b/arch/arm/mach-shark/include/mach/entry-macro.S @@ -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