Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.9 KB
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Rev | Line | |
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[444] | 1 | #if defined __thumb__ |
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| 2 | |
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| 3 | #include "../../string/strcmp.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 | int |
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| 11 | strcmp (const char *s1, const char *s2) |
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| 12 | { |
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| 13 | asm (PRELOADSTR ("%0") : : "r" (s1)); |
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| 14 | asm (PRELOADSTR ("%0") : : "r" (s2)); |
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| 15 | |
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| 16 | #ifndef __OPTIMIZE_SIZE__ |
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| 17 | if (((long)s1 & 3) == ((long)s2 & 3)) |
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| 18 | { |
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| 19 | int result; |
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| 20 | |
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| 21 | /* Skip unaligned part. */ |
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| 22 | while ((long)s1 & 3) |
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| 23 | { |
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| 24 | if (*s1 == '\0' || *s1 != *s2) |
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| 25 | goto out; |
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| 26 | s1++; |
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| 27 | s2++; |
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| 28 | } |
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| 29 | |
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| 30 | /* Load two constants: |
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| 31 | lr = 0xfefefeff [ == ~(0x80808080 << 1) ] |
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| 32 | ip = 0x80808080 */ |
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| 33 | |
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| 34 | asm ( |
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| 35 | "ldr r2, [%1, #0]\n\ |
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| 36 | ldr r3, [%2, #0]\n\ |
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| 37 | cmp r2, r3\n\ |
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| 38 | bne 2f\n\ |
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| 39 | \n\ |
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| 40 | mov ip, #0x80\n\ |
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| 41 | add ip, ip, #0x8000\n\ |
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| 42 | add ip, ip, ip, lsl #16\n\ |
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| 43 | mvn lr, ip, lsl #1\n\ |
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| 44 | \n\ |
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| 45 | 0:\n\ |
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| 46 | ldr r2, [%1, #0]\n\ |
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| 47 | add r3, r2, lr\n\ |
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| 48 | bic r3, r3, r2\n\ |
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| 49 | tst r3, ip\n\ |
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| 50 | beq 1f\n\ |
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| 51 | mov %0, #0x0\n\ |
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| 52 | b 3f\n\ |
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| 53 | 1:\n\ |
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| 54 | ldr r2, [%1, #4]!\n\ |
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| 55 | ldr r3, [%2, #4]!\n\ |
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| 56 | " PRELOADSTR("%1") "\n\ |
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| 57 | " PRELOADSTR("%2") "\n\ |
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| 58 | cmp r2, r3\n\ |
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| 59 | beq 0b" |
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| 60 | |
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| 61 | /* The following part could be done in a C loop as well, but it needs |
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| 62 | to be assembler to save some cycles in the case where the optimized |
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| 63 | loop above finds the strings to be equal. */ |
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| 64 | "\n\ |
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| 65 | 2:\n\ |
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| 66 | ldrb r2, [%1, #0]\n\ |
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| 67 | " PRELOADSTR("%1") "\n\ |
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| 68 | " PRELOADSTR("%2") "\n\ |
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| 69 | cmp r2, #0x0\n\ |
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| 70 | beq 1f\n\ |
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| 71 | ldrb r3, [%2, #0]\n\ |
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| 72 | cmp r2, r3\n\ |
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| 73 | bne 1f\n\ |
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| 74 | 0:\n\ |
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| 75 | ldrb r3, [%1, #1]!\n\ |
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| 76 | add %2, %2, #1\n\ |
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| 77 | ands ip, r3, #0xff\n\ |
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| 78 | beq 1f\n\ |
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| 79 | ldrb r3, [%2]\n\ |
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| 80 | cmp ip, r3\n\ |
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| 81 | beq 0b\n\ |
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| 82 | 1:\n\ |
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| 83 | ldrb lr, [%1, #0]\n\ |
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| 84 | ldrb ip, [%2, #0]\n\ |
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| 85 | rsb %0, ip, lr\n\ |
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| 86 | 3:\n\ |
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| 87 | " |
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| 88 | |
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| 89 | : "=r" (result), "=&r" (s1), "=&r" (s2) |
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| 90 | : "1" (s1), "2" (s2) |
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| 91 | : "lr", "ip", "r2", "r3", "cc"); |
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| 92 | return result; |
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| 93 | } |
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| 94 | #endif |
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| 95 | |
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| 96 | while (*s1 != '\0' && *s1 == *s2) |
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| 97 | { |
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| 98 | asm (PRELOADSTR("%0") : : "r" (s1)); |
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| 99 | asm (PRELOADSTR("%0") : : "r" (s2)); |
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| 100 | s1++; |
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| 101 | s2++; |
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| 102 | } |
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| 103 | out: |
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| 104 | return (*(unsigned char *) s1) - (*(unsigned char *) s2); |
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| 105 | } |
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| 106 | |
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| 107 | #endif |
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