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annotate target-utils/libc/bzero.S @ 1011:6d9b10633f10 default tip

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etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 May 2024 17:29:57 +0000
parents bfed7a5c21a6
children
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4f3843165014 target-utils/libc: bzero imported from Citrine
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1 /*
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2 * This ARM implementation of bzero() has been derived from:
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3 *
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4 * linux/arch/arm/lib/memzero.S
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5 *
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6 * Copyright (C) 1995-2000 Russell King
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7 *
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8 * This program is free software; you can redistribute it and/or modify
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9 * it under the terms of the GNU General Public License version 2 as
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10 * published by the Free Software Foundation.
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11 */
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12
4f3843165014 target-utils/libc: bzero imported from Citrine
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13 .text
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14 .code 32
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15 .globl bzero
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16
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17 /*
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18 * Align the pointer in r0. r3 contains the number of bytes that we are
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19 * mis-aligned by, and r1 is the number of bytes. If r1 < 4, then we
4f3843165014 target-utils/libc: bzero imported from Citrine
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20 * don't bother; we use byte stores instead.
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21 */
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22 1: subs r1, r1, #4 @ 1 do we have enough
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23 blt 5f @ 1 bytes to align with?
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24 cmp r3, #2 @ 1
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25 strltb r2, [r0], #1 @ 1
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26 strleb r2, [r0], #1 @ 1
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27 strb r2, [r0], #1 @ 1
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28 add r1, r1, r3 @ 1 (r1 = r1 - (4 - r3))
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29 /*
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30 * The pointer is now aligned and the length is adjusted. Try doing the
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31 * bzero again.
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32 */
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33
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34 bzero:
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35 mov r2, #0 @ 1
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36 ands r3, r0, #3 @ 1 unaligned?
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37 bne 1b @ 1
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38 /*
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39 * r3 = 0, and we know that the pointer in r0 is aligned to a word boundary.
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40 */
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41 3: subs r1, r1, #4
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bfed7a5c21a6 target-utils/libc/bzero.S: changed signed conditions to unsigned
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42 strcs r2, [r0], #4
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43 bhi 3b @ 1
88
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44 bxeq lr @ 1/2 quick exit
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45 /*
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46 * No need to correct the count; we're only testing bits from now on
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47 *
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48 * When we get here, we've got less than 4 bytes to zero. We
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49 * may have an unaligned pointer as well.
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50 */
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51 5: tst r1, #2 @ 1 2 bytes or more?
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52 strneb r2, [r0], #1 @ 1
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53 strneb r2, [r0], #1 @ 1
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54 tst r1, #1 @ 1 a byte left over
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55 strneb r2, [r0], #1 @ 1
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56 bx lr @ 1