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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [arm/] [lib/] [io-readsl-armv4.S] - Blame information for rev 1765

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1 1275 phoenix 
/*
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 *  linux/arch/arm/lib/io-readsl-armv4.S
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 *
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 *  Copyright (C) 1995-2000 Russell King
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 2 as
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 * published by the Free Software Foundation.
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 */
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#include
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#include
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#include
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/*
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 * Note that some reads can be aligned on half-word boundaries.
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 */
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ENTRY(__raw_readsl)
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                teq     r2, #0          @ do we have to check for the zero len?
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                moveq   pc, lr
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                ands    ip, r1, #3
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                bne     2f
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1:              ldr     r3, [r0]
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                str     r3, [r1], #4
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                subs    r2, r2, #1
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                bne     1b
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                mov     pc, lr
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2:              cmp     ip, #2
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                ldr     ip, [r0]
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                blt     4f
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                bgt     6f
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                strh    ip, [r1], #2
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                mov     ip, ip, lsr #16
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3:              subs    r2, r2, #1
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                ldrne   r3, [r0]
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                orrne   ip, ip, r3, lsl #16
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                strne   ip, [r1], #4
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                movne   ip, r3, lsr #16
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                bne     3b
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                strh    ip, [r1], #2
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                mov     pc, lr
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4:              strb    ip, [r1], #1
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                mov     ip, ip, lsr #8
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                strh    ip, [r1], #2
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                mov     ip, ip, lsr #16
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5:              subs    r2, r2, #1
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                ldrne   r3, [r0]
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                orrne   ip, ip, r3, lsl #8
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                strne   ip, [r1], #4
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                movne   ip, r3, lsr #24
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                bne     5b
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                strb    ip, [r1], #1
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                mov     pc, lr
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6:              strb    ip, [r1], #1
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                mov     ip, ip, lsr #8
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7:              subs    r2, r2, #1
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                ldrne   r3, [r0]
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                orrne   ip, ip, r3, lsl #24
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                strne   ip, [r1], #4
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                movne   ip, r3, lsr #8
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                bne     7b
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                strh    ip, [r1], #2
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                mov     ip, ip, lsr #16
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                strb    ip, [r1]
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                mov     pc, lr
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