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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm/lib/io-readsb.S | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/lib/io-readsb.S')
-rw-r--r-- | arch/arm/lib/io-readsb.S | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/arch/arm/lib/io-readsb.S b/arch/arm/lib/io-readsb.S new file mode 100644 index 000000000..0def9388f --- /dev/null +++ b/arch/arm/lib/io-readsb.S @@ -0,0 +1,120 @@ +/* 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) |