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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/io-readsw-armv4.S
| *
| * Copyright (C) 1995-2000 Russell King
| */
| #include <linux/linkage.h>
| #include <asm/assembler.h>
|
| .macro pack, rd, hw1, hw2
| #ifndef __ARMEB__
| orr \rd, \hw1, \hw2, lsl #16
| #else
| orr \rd, \hw2, \hw1, lsl #16
| #endif
| .endm
|
| .Linsw_align: movs ip, r1, lsl #31
| bne .Linsw_noalign
| ldrh ip, [r0]
| sub r2, r2, #1
| strh ip, [r1], #2
|
| ENTRY(__raw_readsw)
| teq r2, #0
| reteq lr
| tst r1, #3
| bne .Linsw_align
|
| stmfd sp!, {r4, r5, lr}
|
| subs r2, r2, #8
| bmi .Lno_insw_8
|
| .Linsw_8_lp: ldrh r3, [r0]
| ldrh r4, [r0]
| pack r3, r3, r4
|
| ldrh r4, [r0]
| ldrh r5, [r0]
| pack r4, r4, r5
|
| ldrh r5, [r0]
| ldrh ip, [r0]
| pack r5, r5, ip
|
| ldrh ip, [r0]
| ldrh lr, [r0]
| pack ip, ip, lr
|
| subs r2, r2, #8
| stmia r1!, {r3 - r5, ip}
| bpl .Linsw_8_lp
|
| .Lno_insw_8: tst r2, #4
| beq .Lno_insw_4
|
| ldrh r3, [r0]
| ldrh r4, [r0]
| pack r3, r3, r4
|
| ldrh r4, [r0]
| ldrh ip, [r0]
| pack r4, r4, ip
|
| stmia r1!, {r3, r4}
|
| .Lno_insw_4: movs r2, r2, lsl #31
| bcc .Lno_insw_2
|
| ldrh r3, [r0]
| ldrh ip, [r0]
| pack r3, r3, ip
| str r3, [r1], #4
|
| .Lno_insw_2: ldrhne r3, [r0]
| strhne r3, [r1]
|
| ldmfd sp!, {r4, r5, pc}
|
| #ifdef __ARMEB__
| #define _BE_ONLY_(code...) code
| #define _LE_ONLY_(code...)
| #define push_hbyte0 lsr #8
| #define pull_hbyte1 lsl #24
| #else
| #define _BE_ONLY_(code...)
| #define _LE_ONLY_(code...) code
| #define push_hbyte0 lsl #24
| #define pull_hbyte1 lsr #8
| #endif
|
| .Linsw_noalign: stmfd sp!, {r4, lr}
| ldrbcc ip, [r1, #-1]!
| bcc 1f
|
| ldrh ip, [r0]
| sub r2, r2, #1
| _BE_ONLY_( mov ip, ip, ror #8 )
| strb ip, [r1], #1
| _LE_ONLY_( mov ip, ip, lsr #8 )
| _BE_ONLY_( mov ip, ip, lsr #24 )
|
| 1: subs r2, r2, #2
| bmi 3f
| _BE_ONLY_( mov ip, ip, lsl #24 )
|
| 2: ldrh r3, [r0]
| ldrh r4, [r0]
| subs r2, r2, #2
| orr ip, ip, r3, lsl #8
| orr ip, ip, r4, push_hbyte0
| str ip, [r1], #4
| mov ip, r4, pull_hbyte1
| bpl 2b
|
| _BE_ONLY_( mov ip, ip, lsr #24 )
|
| 3: tst r2, #1
| strb ip, [r1], #1
| ldrhne ip, [r0]
| _BE_ONLY_( movne ip, ip, ror #8 )
| strbne ip, [r1], #1
| _LE_ONLY_( movne ip, ip, lsr #8 )
| _BE_ONLY_( movne ip, ip, lsr #24 )
| strbne ip, [r1]
| ldmfd sp!, {r4, pc}
| ENDPROC(__raw_readsw)
|
|
