1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * linux/arch/arm/lib/io-readsw-armv3.S 4 * 5 * Copyright (C) 1995-2000 Russell King 6 */ 7 #include <linux/linkage.h> 8 #include <asm/assembler.h> 9 10 .Linsw_bad_alignment: 11 adr r0, .Linsw_bad_align_msg 12 mov r2, lr 13 b panic 14 .Linsw_bad_align_msg: 15 .asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n" 16 .align 17 18 .Linsw_align: tst r1, #1 19 bne .Linsw_bad_alignment 20 21 ldr r3, [r0] 22 strb r3, [r1], #1 23 mov r3, r3, lsr #8 24 strb r3, [r1], #1 25 26 subs r2, r2, #1 27 reteq lr 28 29 ENTRY(__raw_readsw) 30 teq r2, #0 @ do we have to check for the zero len? 31 reteq lr 32 tst r1, #3 33 bne .Linsw_align 34 35 .Linsw_aligned: mov ip, #0xff 36 orr ip, ip, ip, lsl #8 37 stmfd sp!, {r4, r5, r6, lr} 38 39 subs r2, r2, #8 40 bmi .Lno_insw_8 41 42 .Linsw_8_lp: ldr r3, [r0] 43 and r3, r3, ip 44 ldr r4, [r0] 45 orr r3, r3, r4, lsl #16 46 47 ldr r4, [r0] 48 and r4, r4, ip 49 ldr r5, [r0] 50 orr r4, r4, r5, lsl #16 51 52 ldr r5, [r0] 53 and r5, r5, ip 54 ldr r6, [r0] 55 orr r5, r5, r6, lsl #16 56 57 ldr r6, [r0] 58 and r6, r6, ip 59 ldr lr, [r0] 60 orr r6, r6, lr, lsl #16 61 62 stmia r1!, {r3 - r6} 63 64 subs r2, r2, #8 65 bpl .Linsw_8_lp 66 67 tst r2, #7 68 ldmfdeq sp!, {r4, r5, r6, pc} 69 70 .Lno_insw_8: tst r2, #4 71 beq .Lno_insw_4 72 73 ldr r3, [r0] 74 and r3, r3, ip 75 ldr r4, [r0] 76 orr r3, r3, r4, lsl #16 77 78 ldr r4, [r0] 79 and r4, r4, ip 80 ldr r5, [r0] 81 orr r4, r4, r5, lsl #16 82 83 stmia r1!, {r3, r4} 84 85 .Lno_insw_4: tst r2, #2 86 beq .Lno_insw_2 87 88 ldr r3, [r0] 89 and r3, r3, ip 90 ldr r4, [r0] 91 orr r3, r3, r4, lsl #16 92 93 str r3, [r1], #4 94 95 .Lno_insw_2: tst r2, #1 96 ldrne r3, [r0] 97 strbne r3, [r1], #1 98 movne r3, r3, lsr #8 99 strbne r3, [r1] 100 101 ldmfd sp!, {r4, r5, r6, pc} 102 103 104