newlib-cygwin/newlib/libc/machine/i386/memchr.S

/*
 * ====================================================
 * Copyright (C) 1998 by Cygnus Solutions. All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

	#include "i386mach.h"
	
	.global	SYM (memchr)
       SOTYPE_FUNCTION(memchr)

SYM (memchr):
	pushl	ebp
	movl	esp,ebp
	pushl 	edi
	movl 	12(ebp),eax
	movl 	16(ebp),ecx
	movl 	8(ebp),edi

	xorl	edx,edx
	testl	ecx,ecx
	jz	L1

	cld
	repnz
	scasb

	setnz	dl
	decl	edi
	decl	edx
	andl	edi,edx
L1:
	movl	edx,eax

	leal	-4(ebp),esp
	popl	edi
	leave
	ret
import newlib-2000-02-17 snapshot 2000-02-18 03:39:52 +08:00			`/*`
			`* ====================================================`
			`* Copyright (C) 1998 by Cygnus Solutions. All rights reserved.`
			`*`
			`* Permission to use, copy, modify, and distribute this`
			`* software is freely granted, provided that this notice`
			`* is preserved.`
			`* ====================================================`
			`*/`

			`#include "i386mach.h"`

			`.global SYM (memchr)`
2000-08-27 Werner Almesberger <Werner.Almesberger@epfl.ch> * libc/machine/i386/i386mach.h: added SOTYPE_FUNCTION to set type of global entry points if _I386MACH_NEED_SOTYPE_FUNCTION is defined; Added __CLI and __STI macros (controlled via _I386MACH_ALLOW_HW_INTERRUPTS macro). * libc/machine/i386/f_atan2.S libc/machine/i386/f_atan2f.S libc/machine/i386/f_frexp.S libc/machine/i386/f_frexpf.S libc/machine/i386/f_ldexp.S libc/machine/i386/f_ldexpf.S libc/machine/i386/f_log.S libc/machine/i386/f_log10.S libc/machine/i386/f_log10f.S libc/machine/i386/f_logf.S libc/machine/i386/f_tan.S libc/machine/i386/f_tanf.S libc/machine/i386/memchr.S libc/machine/i386/memcmp.S libc/machine/i386/memcpy.S libc/machine/i386/memmove.S libc/machine/i386/memset.S libc/machine/i386/setjmp.S libc/machine/i386/strchr.S libc/machine/i386/strlen.S: (that's libc/machine/i386/.S) added SOTYPE_FUNCTION(symbol) for all global entry points. libc/machine/i386/setjmp.S: removed code replicated in libc/machine/i386/i386mach.h and included i386mach.h instead; Use __CLI and __STI instead of cli and sti. 2000-08-29 01:50:06 +08:00			`SOTYPE_FUNCTION(memchr)`
import newlib-2000-02-17 snapshot 2000-02-18 03:39:52 +08:00
			`SYM (memchr):`
			`pushl ebp`
			`movl esp,ebp`
			`pushl edi`
			`movl 12(ebp),eax`
			`movl 16(ebp),ecx`
			`movl 8(ebp),edi`

			`xorl edx,edx`
			`testl ecx,ecx`
			`jz L1`

			`cld`
			`repnz`
			`scasb`

			`setnz dl`
			`decl edi`
			`decl edx`
			`andl edi,edx`
			`L1:`
			`movl edx,eax`

			`leal -4(ebp),esp`
			`popl edi`
			`leave`
			`ret`