Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.5 KB
|
Rev | Line | |
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[444] | 1 | #if defined __thumb__ || defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__) |
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| 2 | |
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| 3 | #include "../../string/strlen.c" |
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| 4 | |
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| 5 | #else |
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| 6 | |
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| 7 | #include <string.h> |
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| 8 | #include "xscale.h" |
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| 9 | |
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| 10 | size_t |
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| 11 | strlen (const char *str) |
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| 12 | { |
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| 13 | const char *start = str; |
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| 14 | |
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| 15 | /* Skip unaligned part. */ |
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| 16 | if ((long)str & 3) |
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| 17 | { |
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| 18 | str--; |
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| 19 | do |
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| 20 | { |
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| 21 | if (*++str == '\0') |
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| 22 | goto out; |
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| 23 | } |
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| 24 | while ((long)str & 3); |
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| 25 | } |
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| 26 | |
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| 27 | /* Load two constants: |
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| 28 | R4 = 0xfefefeff [ == ~(0x80808080 << 1) ] |
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| 29 | R5 = 0x80808080 */ |
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| 30 | |
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| 31 | asm ("mov r5, #0x80\n\ |
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| 32 | add r5, r5, #0x8000\n\ |
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| 33 | add r5, r5, r5, lsl #16\n\ |
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| 34 | mvn r4, r5, lsl #1\n\ |
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| 35 | " |
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| 36 | |
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| 37 | #if defined __ARM_ARCH_5__ || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5E__ || defined __ARM_ARCH_5TE__ |
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| 38 | |
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| 39 | " tst %0, #0x7\n\ |
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| 40 | ldreqd r6, [%0]\n\ |
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| 41 | beq 1f\n\ |
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| 42 | ldr r2, [%0]\n\ |
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| 43 | add r3, r2, r4\n\ |
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| 44 | bic r3, r3, r2\n\ |
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| 45 | ands r2, r3, r5\n\ |
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| 46 | bne 2f\n\ |
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| 47 | sub %0, %0, #4\n\ |
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| 48 | \n\ |
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| 49 | 0:\n\ |
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| 50 | ldrd r6, [%0, #8]!\n\ |
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| 51 | " |
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| 52 | PRELOADSTR ("%0") |
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| 53 | "\n\ |
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| 54 | 1:\n\ |
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| 55 | add r3, r6, r4\n\ |
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| 56 | add r2, r7, r4\n\ |
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| 57 | bic r3, r3, r6\n\ |
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| 58 | bic r2, r2, r7\n\ |
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| 59 | and r3, r3, r5\n\ |
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| 60 | and r2, r2, r5\n\ |
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| 61 | orrs r3, r2, r3\n\ |
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| 62 | beq 0b\n\ |
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| 63 | " |
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| 64 | #else |
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| 65 | |
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| 66 | " sub %0, %0, #4\n\ |
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| 67 | \n\ |
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| 68 | 0:\n\ |
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| 69 | ldr r6, [%0, #4]!\n\ |
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| 70 | " |
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| 71 | PRELOADSTR ("%0") |
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| 72 | "\n\ |
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| 73 | add r3, r6, r4\n\ |
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| 74 | bic r3, r3, r6\n\ |
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| 75 | ands r3, r3, r5\n\ |
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| 76 | beq 0b\n\ |
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| 77 | " |
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| 78 | #endif /* __ARM_ARCH_5[T][E]__ */ |
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| 79 | "\n\ |
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| 80 | 2:\n\ |
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| 81 | ldrb r3, [%0]\n\ |
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| 82 | cmp r3, #0x0\n\ |
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| 83 | beq 1f\n\ |
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| 84 | \n\ |
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| 85 | 0:\n\ |
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| 86 | ldrb r3, [%0, #1]!\n\ |
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| 87 | " |
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| 88 | PRELOADSTR ("%0") |
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| 89 | "\n\ |
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| 90 | cmp r3, #0x0\n\ |
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| 91 | bne 0b\n\ |
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| 92 | 1:\n\ |
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| 93 | " |
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| 94 | : "=r" (str) : "0" (str) : "r2", "r3", "r4", "r5", "r6", "r7"); |
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| 95 | |
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| 96 | out: |
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| 97 | return str - start; |
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| 98 | } |
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| 99 | |
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| 100 | #endif |
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