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1 //
2 // Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions
3 //
4 // Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>
5 // Copyright (C) 2019 Google LLC <ebiggers@google.com>
6 //
7 // This program is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License version 2 as
9 // published by the Free Software Foundation.
10 //
12 // Derived from the x86 version:
13 //
14 // Implement fast CRC-T10DIF computation with SSE and PCLMULQDQ instructions
15 //
16 // Copyright (c) 2013, Intel Corporation
17 //
18 // Authors:
19 // Erdinc Ozturk <erdinc.ozturk@intel.com>
20 // Vinodh Gopal <vinodh.gopal@intel.com>
21 // James Guilford <james.guilford@intel.com>
22 // Tim Chen <tim.c.chen@linux.intel.com>
23 //
24 // This software is available to you under a choice of one of two
25 // licenses. You may choose to be licensed under the terms of the GNU
26 // General Public License (GPL) Version 2, available from the file
27 // COPYING in the main directory of this source tree, or the
28 // OpenIB.org BSD license below:
29 //
30 // Redistribution and use in source and binary forms, with or without
31 // modification, are permitted provided that the following conditions are
32 // met:
33 //
34 // * Redistributions of source code must retain the above copyright
35 // notice, this list of conditions and the following disclaimer.
36 //
37 // * Redistributions in binary form must reproduce the above copyright
38 // notice, this list of conditions and the following disclaimer in the
39 // documentation and/or other materials provided with the
40 // distribution.
41 //
42 // * Neither the name of the Intel Corporation nor the names of its
43 // contributors may be used to endorse or promote products derived from
44 // this software without specific prior written permission.
45 //
46 //
47 // THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION ""AS IS"" AND ANY
48 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
50 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL CORPORATION OR
51 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
52 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
53 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
54 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
55 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
56 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
57 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
58 //
59 // Reference paper titled "Fast CRC Computation for Generic
60 // Polynomials Using PCLMULQDQ Instruction"
61 // URL: http://www.intel.com/content/dam/www/public/us/en/documents
62 // /white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf
63 //
65 #include <linux/linkage.h>
66 #include <asm/assembler.h>
68 .text
69 .arch armv8-a+crypto
71 init_crc .req w19
72 buf .req x20
73 len .req x21
74 fold_consts_ptr .req x22
76 fold_consts .req v10
78 ad .req v14
80 k00_16 .req v15
81 k32_48 .req v16
83 t3 .req v17
84 t4 .req v18
85 t5 .req v19
86 t6 .req v20
87 t7 .req v21
88 t8 .req v22
89 t9 .req v23
91 perm1 .req v24
92 perm2 .req v25
93 perm3 .req v26
94 perm4 .req v27
96 bd1 .req v28
97 bd2 .req v29
98 bd3 .req v30
99 bd4 .req v31
101 .macro __pmull_init_p64
102 .endm
104 .macro __pmull_pre_p64, bd
105 .endm
107 .macro __pmull_init_p8
108 // k00_16 := 0x0000000000000000_000000000000ffff
109 // k32_48 := 0x00000000ffffffff_0000ffffffffffff
110 movi k32_48.2d, #0xffffffff
111 mov k32_48.h[2], k32_48.h[0]
112 ushr k00_16.2d, k32_48.2d, #32
114 // prepare the permutation vectors
115 mov_q x5, 0x080f0e0d0c0b0a09
116 movi perm4.8b, #8
117 dup perm1.2d, x5
118 eor perm1.16b, perm1.16b, perm4.16b
119 ushr perm2.2d, perm1.2d, #8
120 ushr perm3.2d, perm1.2d, #16
121 ushr perm4.2d, perm1.2d, #24
122 sli perm2.2d, perm1.2d, #56
123 sli perm3.2d, perm1.2d, #48
124 sli perm4.2d, perm1.2d, #40
125 .endm
127 .macro __pmull_pre_p8, bd
128 tbl bd1.16b, {\bd\().16b}, perm1.16b
129 tbl bd2.16b, {\bd\().16b}, perm2.16b
130 tbl bd3.16b, {\bd\().16b}, perm3.16b
131 tbl bd4.16b, {\bd\().16b}, perm4.16b
132 .endm
134 SYM_FUNC_START_LOCAL(__pmull_p8_core)
135 .L__pmull_p8_core:
136 ext t4.8b, ad.8b, ad.8b, #1 // A1
137 ext t5.8b, ad.8b, ad.8b, #2 // A2
138 ext t6.8b, ad.8b, ad.8b, #3 // A3
140 pmull t4.8h, t4.8b, fold_consts.8b // F = A1*B
141 pmull t8.8h, ad.8b, bd1.8b // E = A*B1
142 pmull t5.8h, t5.8b, fold_consts.8b // H = A2*B
143 pmull t7.8h, ad.8b, bd2.8b // G = A*B2
144 pmull t6.8h, t6.8b, fold_consts.8b // J = A3*B
145 pmull t9.8h, ad.8b, bd3.8b // I = A*B3
146 pmull t3.8h, ad.8b, bd4.8b // K = A*B4
147 b 0f
149 .L__pmull_p8_core2:
150 tbl t4.16b, {ad.16b}, perm1.16b // A1
151 tbl t5.16b, {ad.16b}, perm2.16b // A2
152 tbl t6.16b, {ad.16b}, perm3.16b // A3
154 pmull2 t4.8h, t4.16b, fold_consts.16b // F = A1*B
155 pmull2 t8.8h, ad.16b, bd1.16b // E = A*B1
156 pmull2 t5.8h, t5.16b, fold_consts.16b // H = A2*B
157 pmull2 t7.8h, ad.16b, bd2.16b // G = A*B2
158 pmull2 t6.8h, t6.16b, fold_consts.16b // J = A3*B
159 pmull2 t9.8h, ad.16b, bd3.16b // I = A*B3
160 pmull2 t3.8h, ad.16b, bd4.16b // K = A*B4
162 0: eor t4.16b, t4.16b, t8.16b // L = E + F
163 eor t5.16b, t5.16b, t7.16b // M = G + H
164 eor t6.16b, t6.16b, t9.16b // N = I + J
166 uzp1 t8.2d, t4.2d, t5.2d
167 uzp2 t4.2d, t4.2d, t5.2d
168 uzp1 t7.2d, t6.2d, t3.2d
169 uzp2 t6.2d, t6.2d, t3.2d
171 // t4 = (L) (P0 + P1) << 8
172 // t5 = (M) (P2 + P3) << 16
173 eor t8.16b, t8.16b, t4.16b
174 and t4.16b, t4.16b, k32_48.16b
176 // t6 = (N) (P4 + P5) << 24
177 // t7 = (K) (P6 + P7) << 32
178 eor t7.16b, t7.16b, t6.16b
179 and t6.16b, t6.16b, k00_16.16b
181 eor t8.16b, t8.16b, t4.16b
182 eor t7.16b, t7.16b, t6.16b
184 zip2 t5.2d, t8.2d, t4.2d
185 zip1 t4.2d, t8.2d, t4.2d
186 zip2 t3.2d, t7.2d, t6.2d
187 zip1 t6.2d, t7.2d, t6.2d
189 ext t4.16b, t4.16b, t4.16b, #15
190 ext t5.16b, t5.16b, t5.16b, #14
191 ext t6.16b, t6.16b, t6.16b, #13
192 ext t3.16b, t3.16b, t3.16b, #12
194 eor t4.16b, t4.16b, t5.16b
195 eor t6.16b, t6.16b, t3.16b
196 ret
197 SYM_FUNC_END(__pmull_p8_core)
199 .macro __pmull_p8, rq, ad, bd, i
200 .ifnc \bd, fold_consts
201 .err
202 .endif
203 mov ad.16b, \ad\().16b
204 .ifb \i
205 pmull \rq\().8h, \ad\().8b, \bd\().8b // D = A*B
206 .else
207 pmull2 \rq\().8h, \ad\().16b, \bd\().16b // D = A*B
208 .endif
210 bl .L__pmull_p8_core\i
212 eor \rq\().16b, \rq\().16b, t4.16b
213 eor \rq\().16b, \rq\().16b, t6.16b
214 .endm
216 // Fold reg1, reg2 into the next 32 data bytes, storing the result back
217 // into reg1, reg2.
218 .macro fold_32_bytes, p, reg1, reg2
219 ldp q11, q12, [buf], #0x20
221 __pmull_\p v8, \reg1, fold_consts, 2
222 __pmull_\p \reg1, \reg1, fold_consts
224 CPU_LE( rev64 v11.16b, v11.16b )
225 CPU_LE( rev64 v12.16b, v12.16b )
227 __pmull_\p v9, \reg2, fold_consts, 2
228 __pmull_\p \reg2, \reg2, fold_consts
230 CPU_LE( ext v11.16b, v11.16b, v11.16b, #8 )
231 CPU_LE( ext v12.16b, v12.16b, v12.16b, #8 )
233 eor \reg1\().16b, \reg1\().16b, v8.16b
234 eor \reg2\().16b, \reg2\().16b, v9.16b
235 eor \reg1\().16b, \reg1\().16b, v11.16b
236 eor \reg2\().16b, \reg2\().16b, v12.16b
237 .endm
239 // Fold src_reg into dst_reg, optionally loading the next fold constants
240 .macro fold_16_bytes, p, src_reg, dst_reg, load_next_consts
241 __pmull_\p v8, \src_reg, fold_consts
242 __pmull_\p \src_reg, \src_reg, fold_consts, 2
243 .ifnb \load_next_consts
244 ld1 {fold_consts.2d}, [fold_consts_ptr], #16
245 __pmull_pre_\p fold_consts
246 .endif
247 eor \dst_reg\().16b, \dst_reg\().16b, v8.16b
248 eor \dst_reg\().16b, \dst_reg\().16b, \src_reg\().16b
249 .endm
251 .macro __pmull_p64, rd, rn, rm, n
252 .ifb \n
253 pmull \rd\().1q, \rn\().1d, \rm\().1d
254 .else
255 pmull2 \rd\().1q, \rn\().2d, \rm\().2d
256 .endif
257 .endm
259 .macro crc_t10dif_pmull, p
260 frame_push 4, 128
262 mov init_crc, w0
263 mov buf, x1
264 mov len, x2
266 __pmull_init_\p
268 // For sizes less than 256 bytes, we can't fold 128 bytes at a time.
269 cmp len, #256
270 b.lt .Lless_than_256_bytes_\@
272 adr_l fold_consts_ptr, .Lfold_across_128_bytes_consts
274 // Load the first 128 data bytes. Byte swapping is necessary to make
275 // the bit order match the polynomial coefficient order.
276 ldp q0, q1, [buf]
277 ldp q2, q3, [buf, #0x20]
278 ldp q4, q5, [buf, #0x40]
279 ldp q6, q7, [buf, #0x60]
280 add buf, buf, #0x80
281 CPU_LE( rev64 v0.16b, v0.16b )
282 CPU_LE( rev64 v1.16b, v1.16b )
283 CPU_LE( rev64 v2.16b, v2.16b )
284 CPU_LE( rev64 v3.16b, v3.16b )
285 CPU_LE( rev64 v4.16b, v4.16b )
286 CPU_LE( rev64 v5.16b, v5.16b )
287 CPU_LE( rev64 v6.16b, v6.16b )
288 CPU_LE( rev64 v7.16b, v7.16b )
289 CPU_LE( ext v0.16b, v0.16b, v0.16b, #8 )
290 CPU_LE( ext v1.16b, v1.16b, v1.16b, #8 )
291 CPU_LE( ext v2.16b, v2.16b, v2.16b, #8 )
292 CPU_LE( ext v3.16b, v3.16b, v3.16b, #8 )
293 CPU_LE( ext v4.16b, v4.16b, v4.16b, #8 )
294 CPU_LE( ext v5.16b, v5.16b, v5.16b, #8 )
295 CPU_LE( ext v6.16b, v6.16b, v6.16b, #8 )
296 CPU_LE( ext v7.16b, v7.16b, v7.16b, #8 )
298 // XOR the first 16 data *bits* with the initial CRC value.
299 movi v8.16b, #0
300 mov v8.h[7], init_crc
301 eor v0.16b, v0.16b, v8.16b
303 // Load the constants for folding across 128 bytes.
304 ld1 {fold_consts.2d}, [fold_consts_ptr]
305 __pmull_pre_\p fold_consts
307 // Subtract 128 for the 128 data bytes just consumed. Subtract another
308 // 128 to simplify the termination condition of the following loop.
309 sub len, len, #256
311 // While >= 128 data bytes remain (not counting v0-v7), fold the 128
312 // bytes v0-v7 into them, storing the result back into v0-v7.
313 .Lfold_128_bytes_loop_\@:
314 fold_32_bytes \p, v0, v1
315 fold_32_bytes \p, v2, v3
316 fold_32_bytes \p, v4, v5
317 fold_32_bytes \p, v6, v7
319 subs len, len, #128
320 b.lt .Lfold_128_bytes_loop_done_\@
322 if_will_cond_yield_neon
323 stp q0, q1, [sp, #.Lframe_local_offset]
324 stp q2, q3, [sp, #.Lframe_local_offset + 32]
325 stp q4, q5, [sp, #.Lframe_local_offset + 64]
326 stp q6, q7, [sp, #.Lframe_local_offset + 96]
327 do_cond_yield_neon
328 ldp q0, q1, [sp, #.Lframe_local_offset]
329 ldp q2, q3, [sp, #.Lframe_local_offset + 32]
330 ldp q4, q5, [sp, #.Lframe_local_offset + 64]
331 ldp q6, q7, [sp, #.Lframe_local_offset + 96]
332 ld1 {fold_consts.2d}, [fold_consts_ptr]
333 __pmull_init_\p
334 __pmull_pre_\p fold_consts
335 endif_yield_neon
337 b .Lfold_128_bytes_loop_\@
339 .Lfold_128_bytes_loop_done_\@:
341 // Now fold the 112 bytes in v0-v6 into the 16 bytes in v7.
343 // Fold across 64 bytes.
344 add fold_consts_ptr, fold_consts_ptr, #16
345 ld1 {fold_consts.2d}, [fold_consts_ptr], #16
346 __pmull_pre_\p fold_consts
347 fold_16_bytes \p, v0, v4
348 fold_16_bytes \p, v1, v5
349 fold_16_bytes \p, v2, v6
350 fold_16_bytes \p, v3, v7, 1
351 // Fold across 32 bytes.
352 fold_16_bytes \p, v4, v6
353 fold_16_bytes \p, v5, v7, 1
354 // Fold across 16 bytes.
355 fold_16_bytes \p, v6, v7
357 // Add 128 to get the correct number of data bytes remaining in 0...127
358 // (not counting v7), following the previous extra subtraction by 128.
359 // Then subtract 16 to simplify the termination condition of the
360 // following loop.
361 adds len, len, #(128-16)
363 // While >= 16 data bytes remain (not counting v7), fold the 16 bytes v7
364 // into them, storing the result back into v7.
365 b.lt .Lfold_16_bytes_loop_done_\@
366 .Lfold_16_bytes_loop_\@:
367 __pmull_\p v8, v7, fold_consts
368 __pmull_\p v7, v7, fold_consts, 2
369 eor v7.16b, v7.16b, v8.16b
370 ldr q0, [buf], #16
371 CPU_LE( rev64 v0.16b, v0.16b )
372 CPU_LE( ext v0.16b, v0.16b, v0.16b, #8 )
373 eor v7.16b, v7.16b, v0.16b
374 subs len, len, #16
375 b.ge .Lfold_16_bytes_loop_\@
377 .Lfold_16_bytes_loop_done_\@:
378 // Add 16 to get the correct number of data bytes remaining in 0...15
379 // (not counting v7), following the previous extra subtraction by 16.
380 adds len, len, #16
381 b.eq .Lreduce_final_16_bytes_\@
383 .Lhandle_partial_segment_\@:
384 // Reduce the last '16 + len' bytes where 1 <= len <= 15 and the first
385 // 16 bytes are in v7 and the rest are the remaining data in 'buf'. To
386 // do this without needing a fold constant for each possible 'len',
387 // redivide the bytes into a first chunk of 'len' bytes and a second
388 // chunk of 16 bytes, then fold the first chunk into the second.
390 // v0 = last 16 original data bytes
391 add buf, buf, len
392 ldr q0, [buf, #-16]
393 CPU_LE( rev64 v0.16b, v0.16b )
394 CPU_LE( ext v0.16b, v0.16b, v0.16b, #8 )
396 // v1 = high order part of second chunk: v7 left-shifted by 'len' bytes.
397 adr_l x4, .Lbyteshift_table + 16
398 sub x4, x4, len
399 ld1 {v2.16b}, [x4]
400 tbl v1.16b, {v7.16b}, v2.16b
402 // v3 = first chunk: v7 right-shifted by '16-len' bytes.
403 movi v3.16b, #0x80
404 eor v2.16b, v2.16b, v3.16b
405 tbl v3.16b, {v7.16b}, v2.16b
407 // Convert to 8-bit masks: 'len' 0x00 bytes, then '16-len' 0xff bytes.
408 sshr v2.16b, v2.16b, #7
410 // v2 = second chunk: 'len' bytes from v0 (low-order bytes),
411 // then '16-len' bytes from v1 (high-order bytes).
412 bsl v2.16b, v1.16b, v0.16b
414 // Fold the first chunk into the second chunk, storing the result in v7.
415 __pmull_\p v0, v3, fold_consts
416 __pmull_\p v7, v3, fold_consts, 2
417 eor v7.16b, v7.16b, v0.16b
418 eor v7.16b, v7.16b, v2.16b
420 .Lreduce_final_16_bytes_\@:
421 // Reduce the 128-bit value M(x), stored in v7, to the final 16-bit CRC.
423 movi v2.16b, #0 // init zero register
425 // Load 'x^48 * (x^48 mod G(x))' and 'x^48 * (x^80 mod G(x))'.
426 ld1 {fold_consts.2d}, [fold_consts_ptr], #16
427 __pmull_pre_\p fold_consts
429 // Fold the high 64 bits into the low 64 bits, while also multiplying by
430 // x^64. This produces a 128-bit value congruent to x^64 * M(x) and
431 // whose low 48 bits are 0.
432 ext v0.16b, v2.16b, v7.16b, #8
433 __pmull_\p v7, v7, fold_consts, 2 // high bits * x^48 * (x^80 mod G(x))
434 eor v0.16b, v0.16b, v7.16b // + low bits * x^64
436 // Fold the high 32 bits into the low 96 bits. This produces a 96-bit
437 // value congruent to x^64 * M(x) and whose low 48 bits are 0.
438 ext v1.16b, v0.16b, v2.16b, #12 // extract high 32 bits
439 mov v0.s[3], v2.s[0] // zero high 32 bits
440 __pmull_\p v1, v1, fold_consts // high 32 bits * x^48 * (x^48 mod G(x))
441 eor v0.16b, v0.16b, v1.16b // + low bits
443 // Load G(x) and floor(x^48 / G(x)).
444 ld1 {fold_consts.2d}, [fold_consts_ptr]
445 __pmull_pre_\p fold_consts
447 // Use Barrett reduction to compute the final CRC value.
448 __pmull_\p v1, v0, fold_consts, 2 // high 32 bits * floor(x^48 / G(x))
449 ushr v1.2d, v1.2d, #32 // /= x^32
450 __pmull_\p v1, v1, fold_consts // *= G(x)
451 ushr v0.2d, v0.2d, #48
452 eor v0.16b, v0.16b, v1.16b // + low 16 nonzero bits
453 // Final CRC value (x^16 * M(x)) mod G(x) is in low 16 bits of v0.
455 umov w0, v0.h[0]
456 frame_pop
457 ret
459 .Lless_than_256_bytes_\@:
460 // Checksumming a buffer of length 16...255 bytes
462 adr_l fold_consts_ptr, .Lfold_across_16_bytes_consts
464 // Load the first 16 data bytes.
465 ldr q7, [buf], #0x10
466 CPU_LE( rev64 v7.16b, v7.16b )
467 CPU_LE( ext v7.16b, v7.16b, v7.16b, #8 )
469 // XOR the first 16 data *bits* with the initial CRC value.
470 movi v0.16b, #0
471 mov v0.h[7], init_crc
472 eor v7.16b, v7.16b, v0.16b
474 // Load the fold-across-16-bytes constants.
475 ld1 {fold_consts.2d}, [fold_consts_ptr], #16
476 __pmull_pre_\p fold_consts
478 cmp len, #16
479 b.eq .Lreduce_final_16_bytes_\@ // len == 16
480 subs len, len, #32
481 b.ge .Lfold_16_bytes_loop_\@ // 32 <= len <= 255
482 add len, len, #16
483 b .Lhandle_partial_segment_\@ // 17 <= len <= 31
484 .endm
486 //
487 // u16 crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len);
488 //
489 // Assumes len >= 16.
490 //
491 SYM_FUNC_START(crc_t10dif_pmull_p8)
492 crc_t10dif_pmull p8
493 SYM_FUNC_END(crc_t10dif_pmull_p8)
495 .align 5
496 //
497 // u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len);
498 //
499 // Assumes len >= 16.
500 //
501 SYM_FUNC_START(crc_t10dif_pmull_p64)
502 crc_t10dif_pmull p64
503 SYM_FUNC_END(crc_t10dif_pmull_p64)
505 .section ".rodata", "a"
506 .align 4
508 // Fold constants precomputed from the polynomial 0x18bb7
509 // G(x) = x^16 + x^15 + x^11 + x^9 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + x^0
510 .Lfold_across_128_bytes_consts:
511 .quad 0x0000000000006123 // x^(8*128) mod G(x)
512 .quad 0x0000000000002295 // x^(8*128+64) mod G(x)
513 // .Lfold_across_64_bytes_consts:
514 .quad 0x0000000000001069 // x^(4*128) mod G(x)
515 .quad 0x000000000000dd31 // x^(4*128+64) mod G(x)
516 // .Lfold_across_32_bytes_consts:
517 .quad 0x000000000000857d // x^(2*128) mod G(x)
518 .quad 0x0000000000007acc // x^(2*128+64) mod G(x)
519 .Lfold_across_16_bytes_consts:
520 .quad 0x000000000000a010 // x^(1*128) mod G(x)
521 .quad 0x0000000000001faa // x^(1*128+64) mod G(x)
522 // .Lfinal_fold_consts:
523 .quad 0x1368000000000000 // x^48 * (x^48 mod G(x))
524 .quad 0x2d56000000000000 // x^48 * (x^80 mod G(x))
525 // .Lbarrett_reduction_consts:
526 .quad 0x0000000000018bb7 // G(x)
527 .quad 0x00000001f65a57f8 // floor(x^48 / G(x))
529 // For 1 <= len <= 15, the 16-byte vector beginning at &byteshift_table[16 -
530 // len] is the index vector to shift left by 'len' bytes, and is also {0x80,
531 // ..., 0x80} XOR the index vector to shift right by '16 - len' bytes.
532 .Lbyteshift_table:
533 .byte 0x0, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87
534 .byte 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f
535 .byte 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7
536 .byte 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe , 0x0