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