| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * linux/arch/arm/lib/io-readsl.S |
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| 4 | * |
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| 5 | * Copyright (C) 1995-2000 Russell King |
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| 6 | */ |
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| 7 | #include <linux/linkage.h> |
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| 8 | #include <asm/assembler.h> |
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| 9 | |
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| 10 | ENTRY(__raw_readsl) |
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| 11 | teq r2, #0 @ do we have to check for the zero len? |
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| 12 | reteq lr |
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| 13 | ands ip, r1, #3 |
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| 14 | bne 3f |
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| 15 | |
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| 16 | subs r2, r2, #4 |
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| 17 | bmi 2f |
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| 18 | stmfd sp!, {r4, lr} |
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| 19 | 1: ldr r3, [r0, #0] |
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| 20 | ldr r4, [r0, #0] |
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| 21 | ldr ip, [r0, #0] |
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| 22 | ldr lr, [r0, #0] |
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| 23 | subs r2, r2, #4 |
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| 24 | stmia r1!, {r3, r4, ip, lr} |
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| 25 | bpl 1b |
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| 26 | ldmfd sp!, {r4, lr} |
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| 27 | 2: movs r2, r2, lsl #31 |
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| 28 | ldrcs r3, [r0, #0] |
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| 29 | ldrcs ip, [r0, #0] |
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| 30 | stmiacs r1!, {r3, ip} |
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| 31 | ldrne r3, [r0, #0] |
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| 32 | strne r3, [r1, #0] |
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| 33 | ret lr |
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| 34 | |
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| 35 | 3: ldr r3, [r0] |
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| 36 | cmp ip, #2 |
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| 37 | mov ip, r3, get_byte_0 |
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| 38 | strb ip, [r1], #1 |
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| 39 | bgt 6f |
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| 40 | mov ip, r3, get_byte_1 |
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| 41 | strb ip, [r1], #1 |
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| 42 | beq 5f |
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| 43 | mov ip, r3, get_byte_2 |
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| 44 | strb ip, [r1], #1 |
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| 45 | |
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| 46 | 4: subs r2, r2, #1 |
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| 47 | mov ip, r3, lspull #24 |
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| 48 | ldrne r3, [r0] |
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| 49 | orrne ip, ip, r3, lspush #8 |
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| 50 | strne ip, [r1], #4 |
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| 51 | bne 4b |
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| 52 | b 8f |
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| 53 | |
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| 54 | 5: subs r2, r2, #1 |
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| 55 | mov ip, r3, lspull #16 |
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| 56 | ldrne r3, [r0] |
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| 57 | orrne ip, ip, r3, lspush #16 |
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| 58 | strne ip, [r1], #4 |
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| 59 | bne 5b |
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| 60 | b 7f |
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| 61 | |
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| 62 | 6: subs r2, r2, #1 |
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| 63 | mov ip, r3, lspull #8 |
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| 64 | ldrne r3, [r0] |
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| 65 | orrne ip, ip, r3, lspush #24 |
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| 66 | strne ip, [r1], #4 |
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| 67 | bne 6b |
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| 68 | |
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| 69 | mov r3, ip, get_byte_2 |
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| 70 | strb r3, [r1, #2] |
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| 71 | 7: mov r3, ip, get_byte_1 |
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| 72 | strb r3, [r1, #1] |
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| 73 | 8: mov r3, ip, get_byte_0 |
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| 74 | strb r3, [r1, #0] |
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| 75 | ret lr |
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| 76 | ENDPROC(__raw_readsl) |
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| 77 | |
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