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|
; $Id: strchr.asm $
;; @file
; IPRT - No-CRT strchr - AMD64 & X86.
;
;
; Copyright (C) 2006-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
%include "iprt/asmdefs.mac"
BEGINCODE
;;
; @param psz gcc: rdi msc: rcx x86:[esp+4] wcall: eax
; @param ch gcc: esi msc: edx x86:[esp+8] wcall: edx
RT_NOCRT_BEGINPROC strchr
cld
; check for ch == 0 and setup normal strchr.
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_MSC
or dl, dl
jz near .strlen
mov r9, rsi ; save rsi
mov rsi, rcx
%else
or sil, sil
jz near .strlen
mov edx, esi
mov rsi, rdi
%endif
%else
%ifndef ASM_CALL32_WATCOM
mov edx, [esp + 8]
%endif
or dl, dl
jz near .strlen
mov ecx, esi ; save esi
%ifdef ASM_CALL32_WATCOM
mov esi, eax
%else
mov esi, [esp + 4]
%endif
%endif
; do the search
.next:
lodsb
cmp al, dl
je .found
test al, al
jz .not_found
lodsb
cmp al, dl
je .found
test al, al
jz .not_found
lodsb
cmp al, dl
je .found
test al, al
jz .not_found
lodsb
cmp al, dl
je .found
test al, al
jz .not_found
jmp .next
.found:
lea xAX, [xSI - 1]
%ifdef ASM_CALL64_MSC
mov rsi, r9
%endif
%ifdef RT_ARCH_X86
mov esi, ecx
%endif
ret
.not_found:
%ifdef ASM_CALL64_MSC
mov rsi, r9
%endif
%ifdef RT_ARCH_X86
mov esi, ecx
%endif
xor eax, eax
ret
;
; Special case: strchr(str, '\0');
;
align 16
.strlen:
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_MSC
mov r9, rdi ; save rdi
mov rdi, rcx
%endif
%else
mov edx, edi ; save edi
%ifdef ASM_CALL32_WATCOM
mov edi, eax
%else
mov edi, [esp + 4]
%endif
%endif
mov xCX, -1
xor eax, eax
repne scasb
lea xAX, [xDI - 1]
%ifdef ASM_CALL64_MSC
mov rdi, r9
%endif
%ifdef RT_ARCH_X86
mov edi, edx
%endif
ret
ENDPROC RT_NOCRT(strchr)
|
