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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * linux/arch/arm/lib/io-readsb.S
- *
- * Copyright (C) 1995-2000 Russell King
- */
- #include <linux/linkage.h>
- #include <asm/assembler.h>
- .Linsb_align: rsb ip, ip, #4
- cmp ip, r2
- movgt ip, r2
- cmp ip, #2
- ldrb r3, [r0]
- strb r3, [r1], #1
- ldrbge r3, [r0]
- strbge r3, [r1], #1
- ldrbgt r3, [r0]
- strbgt r3, [r1], #1
- subs r2, r2, ip
- bne .Linsb_aligned
- ENTRY(__raw_readsb)
- teq r2, #0 @ do we have to check for the zero len?
- reteq lr
- ands ip, r1, #3
- bne .Linsb_align
- .Linsb_aligned: stmfd sp!, {r4 - r6, lr}
- subs r2, r2, #16
- bmi .Linsb_no_16
- .Linsb_16_lp: ldrb r3, [r0]
- ldrb r4, [r0]
- ldrb r5, [r0]
- mov r3, r3, put_byte_0
- ldrb r6, [r0]
- orr r3, r3, r4, put_byte_1
- ldrb r4, [r0]
- orr r3, r3, r5, put_byte_2
- ldrb r5, [r0]
- orr r3, r3, r6, put_byte_3
- ldrb r6, [r0]
- mov r4, r4, put_byte_0
- ldrb ip, [r0]
- orr r4, r4, r5, put_byte_1
- ldrb r5, [r0]
- orr r4, r4, r6, put_byte_2
- ldrb r6, [r0]
- orr r4, r4, ip, put_byte_3
- ldrb ip, [r0]
- mov r5, r5, put_byte_0
- ldrb lr, [r0]
- orr r5, r5, r6, put_byte_1
- ldrb r6, [r0]
- orr r5, r5, ip, put_byte_2
- ldrb ip, [r0]
- orr r5, r5, lr, put_byte_3
- ldrb lr, [r0]
- mov r6, r6, put_byte_0
- orr r6, r6, ip, put_byte_1
- ldrb ip, [r0]
- orr r6, r6, lr, put_byte_2
- orr r6, r6, ip, put_byte_3
- stmia r1!, {r3 - r6}
- subs r2, r2, #16
- bpl .Linsb_16_lp
- tst r2, #15
- ldmfdeq sp!, {r4 - r6, pc}
- .Linsb_no_16: tst r2, #8
- beq .Linsb_no_8
- ldrb r3, [r0]
- ldrb r4, [r0]
- ldrb r5, [r0]
- mov r3, r3, put_byte_0
- ldrb r6, [r0]
- orr r3, r3, r4, put_byte_1
- ldrb r4, [r0]
- orr r3, r3, r5, put_byte_2
- ldrb r5, [r0]
- orr r3, r3, r6, put_byte_3
- ldrb r6, [r0]
- mov r4, r4, put_byte_0
- ldrb ip, [r0]
- orr r4, r4, r5, put_byte_1
- orr r4, r4, r6, put_byte_2
- orr r4, r4, ip, put_byte_3
- stmia r1!, {r3, r4}
- .Linsb_no_8: tst r2, #4
- beq .Linsb_no_4
- ldrb r3, [r0]
- ldrb r4, [r0]
- ldrb r5, [r0]
- ldrb r6, [r0]
- mov r3, r3, put_byte_0
- orr r3, r3, r4, put_byte_1
- orr r3, r3, r5, put_byte_2
- orr r3, r3, r6, put_byte_3
- str r3, [r1], #4
- .Linsb_no_4: ands r2, r2, #3
- ldmfdeq sp!, {r4 - r6, pc}
- cmp r2, #2
- ldrb r3, [r0]
- strb r3, [r1], #1
- ldrbge r3, [r0]
- strbge r3, [r1], #1
- ldrbgt r3, [r0]
- strbgt r3, [r1]
- ldmfd sp!, {r4 - r6, pc}
- ENDPROC(__raw_readsb)
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