/* * linux/arch/arm/lib/io-readsl.S * * Copyright (C) 1995-2000 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/linkage.h> #include <asm/assembler.h> ENTRY(__raw_readsl) teq r2, #0 @ do we have to check for the zero len? moveq pc, lr ands ip, r1, #3 bne 3f subs r2, r2, #4 bmi 2f stmfd sp!, {r4, lr} 1: ldr r3, [r0, #0] ldr r4, [r0, #0] ldr ip, [r0, #0] ldr lr, [r0, #0] subs r2, r2, #4 stmia r1!, {r3, r4, ip, lr} bpl 1b ldmfd sp!, {r4, lr} 2: movs r2, r2, lsl #31 ldrcs r3, [r0, #0] ldrcs ip, [r0, #0] stmcsia r1!, {r3, ip} ldrne r3, [r0, #0] strne r3, [r1, #0] mov pc, lr 3: ldr r3, [r0] cmp ip, #2 mov ip, r3, get_byte_0 strb ip, [r1], #1 bgt 6f mov ip, r3, get_byte_1 strb ip, [r1], #1 beq 5f mov ip, r3, get_byte_2 strb ip, [r1], #1 4: subs r2, r2, #1 mov ip, r3, pull #24 ldrne r3, [r0] orrne ip, ip, r3, push #8 strne ip, [r1], #4 bne 4b b 8f 5: subs r2, r2, #1 mov ip, r3, pull #16 ldrne r3, [r0] orrne ip, ip, r3, push #16 strne ip, [r1], #4 bne 5b b 7f 6: subs r2, r2, #1 mov ip, r3, pull #8 ldrne r3, [r0] orrne ip, ip, r3, push #24 strne ip, [r1], #4 bne 6b mov r3, ip, get_byte_2 strb r3, [r1, #2] 7: mov r3, ip, get_byte_1 strb r3, [r1, #1] 8: mov r3, ip, get_byte_0 strb r3, [r1, #0] mov pc, lr ENDPROC(__raw_readsl)