| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * linux/arch/arm/lib/io-readsb.S |
| 4 | * |
| 5 | * Copyright (C) 1995-2000 Russell King |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 6 | */ |
| 7 | #include <linux/linkage.h> |
| 8 | #include <asm/assembler.h> |
| 9 | |
| 10 | .Linsb_align: rsb ip, ip, #4 |
| 11 | cmp ip, r2 |
| 12 | movgt ip, r2 |
| 13 | cmp ip, #2 |
| 14 | ldrb r3, [r0] |
| 15 | strb r3, [r1], #1 |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 16 | ldrbge r3, [r0] |
| 17 | strbge r3, [r1], #1 |
| 18 | ldrbgt r3, [r0] |
| 19 | strbgt r3, [r1], #1 |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 20 | subs r2, r2, ip |
| 21 | bne .Linsb_aligned |
| 22 | |
| 23 | ENTRY(__raw_readsb) |
| 24 | teq r2, #0 @ do we have to check for the zero len? |
| 25 | reteq lr |
| 26 | ands ip, r1, #3 |
| 27 | bne .Linsb_align |
| 28 | |
| 29 | .Linsb_aligned: stmfd sp!, {r4 - r6, lr} |
| 30 | |
| 31 | subs r2, r2, #16 |
| 32 | bmi .Linsb_no_16 |
| 33 | |
| 34 | .Linsb_16_lp: ldrb r3, [r0] |
| 35 | ldrb r4, [r0] |
| 36 | ldrb r5, [r0] |
| 37 | mov r3, r3, put_byte_0 |
| 38 | ldrb r6, [r0] |
| 39 | orr r3, r3, r4, put_byte_1 |
| 40 | ldrb r4, [r0] |
| 41 | orr r3, r3, r5, put_byte_2 |
| 42 | ldrb r5, [r0] |
| 43 | orr r3, r3, r6, put_byte_3 |
| 44 | ldrb r6, [r0] |
| 45 | mov r4, r4, put_byte_0 |
| 46 | ldrb ip, [r0] |
| 47 | orr r4, r4, r5, put_byte_1 |
| 48 | ldrb r5, [r0] |
| 49 | orr r4, r4, r6, put_byte_2 |
| 50 | ldrb r6, [r0] |
| 51 | orr r4, r4, ip, put_byte_3 |
| 52 | ldrb ip, [r0] |
| 53 | mov r5, r5, put_byte_0 |
| 54 | ldrb lr, [r0] |
| 55 | orr r5, r5, r6, put_byte_1 |
| 56 | ldrb r6, [r0] |
| 57 | orr r5, r5, ip, put_byte_2 |
| 58 | ldrb ip, [r0] |
| 59 | orr r5, r5, lr, put_byte_3 |
| 60 | ldrb lr, [r0] |
| 61 | mov r6, r6, put_byte_0 |
| 62 | orr r6, r6, ip, put_byte_1 |
| 63 | ldrb ip, [r0] |
| 64 | orr r6, r6, lr, put_byte_2 |
| 65 | orr r6, r6, ip, put_byte_3 |
| 66 | stmia r1!, {r3 - r6} |
| 67 | |
| 68 | subs r2, r2, #16 |
| 69 | bpl .Linsb_16_lp |
| 70 | |
| 71 | tst r2, #15 |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 72 | ldmfdeq sp!, {r4 - r6, pc} |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 73 | |
| 74 | .Linsb_no_16: tst r2, #8 |
| 75 | beq .Linsb_no_8 |
| 76 | |
| 77 | ldrb r3, [r0] |
| 78 | ldrb r4, [r0] |
| 79 | ldrb r5, [r0] |
| 80 | mov r3, r3, put_byte_0 |
| 81 | ldrb r6, [r0] |
| 82 | orr r3, r3, r4, put_byte_1 |
| 83 | ldrb r4, [r0] |
| 84 | orr r3, r3, r5, put_byte_2 |
| 85 | ldrb r5, [r0] |
| 86 | orr r3, r3, r6, put_byte_3 |
| 87 | ldrb r6, [r0] |
| 88 | mov r4, r4, put_byte_0 |
| 89 | ldrb ip, [r0] |
| 90 | orr r4, r4, r5, put_byte_1 |
| 91 | orr r4, r4, r6, put_byte_2 |
| 92 | orr r4, r4, ip, put_byte_3 |
| 93 | stmia r1!, {r3, r4} |
| 94 | |
| 95 | .Linsb_no_8: tst r2, #4 |
| 96 | beq .Linsb_no_4 |
| 97 | |
| 98 | ldrb r3, [r0] |
| 99 | ldrb r4, [r0] |
| 100 | ldrb r5, [r0] |
| 101 | ldrb r6, [r0] |
| 102 | mov r3, r3, put_byte_0 |
| 103 | orr r3, r3, r4, put_byte_1 |
| 104 | orr r3, r3, r5, put_byte_2 |
| 105 | orr r3, r3, r6, put_byte_3 |
| 106 | str r3, [r1], #4 |
| 107 | |
| 108 | .Linsb_no_4: ands r2, r2, #3 |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 109 | ldmfdeq sp!, {r4 - r6, pc} |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 110 | |
| 111 | cmp r2, #2 |
| 112 | ldrb r3, [r0] |
| 113 | strb r3, [r1], #1 |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 114 | ldrbge r3, [r0] |
| 115 | strbge r3, [r1], #1 |
| 116 | ldrbgt r3, [r0] |
| 117 | strbgt r3, [r1] |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 118 | |
| 119 | ldmfd sp!, {r4 - r6, pc} |
| 120 | ENDPROC(__raw_readsb) |