1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun/* 3*4882a593Smuzhiyun * linux/arch/arm/lib/io-readsl.S 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 1995-2000 Russell King 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun#include <linux/linkage.h> 8*4882a593Smuzhiyun#include <asm/assembler.h> 9*4882a593Smuzhiyun 10*4882a593SmuzhiyunENTRY(__raw_readsl) 11*4882a593Smuzhiyun teq r2, #0 @ do we have to check for the zero len? 12*4882a593Smuzhiyun reteq lr 13*4882a593Smuzhiyun ands ip, r1, #3 14*4882a593Smuzhiyun bne 3f 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun subs r2, r2, #4 17*4882a593Smuzhiyun bmi 2f 18*4882a593Smuzhiyun stmfd sp!, {r4, lr} 19*4882a593Smuzhiyun1: ldr r3, [r0, #0] 20*4882a593Smuzhiyun ldr r4, [r0, #0] 21*4882a593Smuzhiyun ldr ip, [r0, #0] 22*4882a593Smuzhiyun ldr lr, [r0, #0] 23*4882a593Smuzhiyun subs r2, r2, #4 24*4882a593Smuzhiyun stmia r1!, {r3, r4, ip, lr} 25*4882a593Smuzhiyun bpl 1b 26*4882a593Smuzhiyun ldmfd sp!, {r4, lr} 27*4882a593Smuzhiyun2: movs r2, r2, lsl #31 28*4882a593Smuzhiyun ldrcs r3, [r0, #0] 29*4882a593Smuzhiyun ldrcs ip, [r0, #0] 30*4882a593Smuzhiyun stmiacs r1!, {r3, ip} 31*4882a593Smuzhiyun ldrne r3, [r0, #0] 32*4882a593Smuzhiyun strne r3, [r1, #0] 33*4882a593Smuzhiyun ret lr 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun3: ldr r3, [r0] 36*4882a593Smuzhiyun cmp ip, #2 37*4882a593Smuzhiyun mov ip, r3, get_byte_0 38*4882a593Smuzhiyun strb ip, [r1], #1 39*4882a593Smuzhiyun bgt 6f 40*4882a593Smuzhiyun mov ip, r3, get_byte_1 41*4882a593Smuzhiyun strb ip, [r1], #1 42*4882a593Smuzhiyun beq 5f 43*4882a593Smuzhiyun mov ip, r3, get_byte_2 44*4882a593Smuzhiyun strb ip, [r1], #1 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun4: subs r2, r2, #1 47*4882a593Smuzhiyun mov ip, r3, lspull #24 48*4882a593Smuzhiyun ldrne r3, [r0] 49*4882a593Smuzhiyun orrne ip, ip, r3, lspush #8 50*4882a593Smuzhiyun strne ip, [r1], #4 51*4882a593Smuzhiyun bne 4b 52*4882a593Smuzhiyun b 8f 53*4882a593Smuzhiyun 54*4882a593Smuzhiyun5: subs r2, r2, #1 55*4882a593Smuzhiyun mov ip, r3, lspull #16 56*4882a593Smuzhiyun ldrne r3, [r0] 57*4882a593Smuzhiyun orrne ip, ip, r3, lspush #16 58*4882a593Smuzhiyun strne ip, [r1], #4 59*4882a593Smuzhiyun bne 5b 60*4882a593Smuzhiyun b 7f 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun6: subs r2, r2, #1 63*4882a593Smuzhiyun mov ip, r3, lspull #8 64*4882a593Smuzhiyun ldrne r3, [r0] 65*4882a593Smuzhiyun orrne ip, ip, r3, lspush #24 66*4882a593Smuzhiyun strne ip, [r1], #4 67*4882a593Smuzhiyun bne 6b 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun mov r3, ip, get_byte_2 70*4882a593Smuzhiyun strb r3, [r1, #2] 71*4882a593Smuzhiyun7: mov r3, ip, get_byte_1 72*4882a593Smuzhiyun strb r3, [r1, #1] 73*4882a593Smuzhiyun8: mov r3, ip, get_byte_0 74*4882a593Smuzhiyun strb r3, [r1, #0] 75*4882a593Smuzhiyun ret lr 76*4882a593SmuzhiyunENDPROC(__raw_readsl) 77