27 lines
780 B
ArmAsm
27 lines
780 B
ArmAsm
/* bcmp() Author: Kees J. Bot */
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/* 2 Jan 1994 */
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/* int bcmp(const void *s1, const void *s2, size_t n) */
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/* Compare two chunks of memory. */
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/* This is a BSD routine that escaped from the kernel. Don't use. */
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/* (Alas it is not without some use, it reports the number of bytes */
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/* after the bytes that are equal. So it can't be simply replaced.) */
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/* */
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#include <machine/asm.h>
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ENTRY(bcmp)
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push %ebp
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movl %esp, %ebp
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push 16(%ebp)
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push 12(%ebp)
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push 8(%ebp)
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call _C_LABEL(memcmp) /* Let memcmp do the work */
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testl %eax, %eax
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je equal
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subl 8(%ebp), %edx /* Memcmp was nice enough to leave "esi" in edx */
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decl %edx /* Number of bytes that are equal */
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movl 16(%ebp), %eax
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subl %edx, %eax /* Number of bytes that are unequal */
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equal:
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leave
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ret
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