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Last change
on this file since 194 was 194, checked in by vboxsync, 18 years ago |
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memchr.
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| 1 | ; $Id: memchr.asm 194 2007-01-19 21:56:57Z vboxsync $
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| 2 | ;; @file
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| 3 | ; InnoTek Portable Runtime - No-CRT memchr - AMD64 & X86.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006 InnoTek Systemberatung GmbH
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License as published by the Free Software Foundation,
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| 13 | ; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | ; distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | ; be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; If you received this file as part of a commercial VirtualBox
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| 18 | ; distribution, then only the terms of your commercial VirtualBox
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| 19 | ; license agreement apply instead of the previous paragraph.
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| 20 | ;
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| 21 |
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| 22 | %include "iprt/asmdefs.mac"
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| 23 |
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| 24 | ;;
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| 25 | ; @param pv gcc: rdi msc: ecx x86:[esp+4]
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| 26 | ; @param ch gcc: esi msc: edx x86:[esp+8]
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| 27 | ; @param cb gcc: rdx msc: r8 x86:[esp+0ch]
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| 28 | BEGINPROC RT_NOCRT(memchr)
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| 29 | cld
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| 30 | %ifdef __AMD64__
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| 31 | %ifdef ASM_CALL64_MSC
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| 32 | or r8, r8
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| 33 | jz .not_found_early
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| 34 |
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| 35 | mov r9, rdi ; save rdi
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| 36 | mov eax, edx
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| 37 | mov rdi, rcx
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| 38 | mov rcx, r8
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| 39 | %else
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| 40 | mov rcx, rdx
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| 41 | jrcxz .not_found_early
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| 42 |
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| 43 | mov eax, esi
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| 44 | %endif
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| 45 |
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| 46 | %else
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| 47 | mov ecx, [esp + 0ch]
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| 48 | jecxz .not_found_early
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| 49 | mov edx, edi ; save edi
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| 50 | mov eax, [esp + 8]
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| 51 | mov edi, [esp + 4]
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| 52 | %endif
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| 53 |
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| 54 | ; do the search
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| 55 | repne scasb
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| 56 | jne .not_found
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| 57 |
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| 58 | ; found it
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| 59 | lea xAX, [xDI - 1]
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| 60 | %ifdef ASM_CALL64_MSC
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| 61 | mov rdi, r9
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| 62 | %endif
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| 63 | %ifdef __X86__
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| 64 | mov edi, edx
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| 65 | %endif
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| 66 | ret
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| 67 |
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| 68 | .not_found:
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| 69 | %ifdef ASM_CALL64_MSC
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| 70 | mov rdi, r9
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| 71 | %endif
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| 72 | %ifdef __X86__
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| 73 | mov edi, edx
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| 74 | %endif
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| 75 | .not_found_early:
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| 76 | xor eax, eax
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| 77 | ret
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| 78 | ENDPROC RT_NOCRT(memchr)
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| 79 |
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