1 | ; $Id: ASMAtomicCmpXchgU64.asm 92799 2021-12-08 00:47:27Z vboxsync $
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2 | ;; @file
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3 | ; IPRT - ASMAtomicCmpXchgU64().
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2006-2020 Oracle Corporation
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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 (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 | ; The contents of this file may alternatively be used under the terms
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18 | ; of the Common Development and Distribution License Version 1.0
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19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | ; VirtualBox OSE distribution, in which case the provisions of the
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21 | ; CDDL are applicable instead of those of the GPL.
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22 | ;
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23 | ; You may elect to license modified versions of this file under the
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24 | ; terms and conditions of either the GPL or the CDDL or both.
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25 | ;
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26 |
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27 | ;*******************************************************************************
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28 | ;* Header Files *
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29 | ;*******************************************************************************
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30 | %include "iprt/asmdefs.mac"
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31 |
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32 | BEGINCODE
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33 |
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34 | ;;
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35 | ; Atomically compares and exchanges an unsigned 64-bit int.
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36 | ;
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37 | ; @param pu64 x86:ebp+8 gcc:rdi msc:rcx
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38 | ; @param u64New x86:ebp+c gcc:rsi msc:rdx
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39 | ; @param u64Old x86:ebp+14 gcc:rdx msc:r8
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40 | ;
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41 | ; @returns bool result: true if successfully exchanged, false if not.
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42 | ; x86:al
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43 | ;
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44 | RT_BEGINPROC ASMAtomicCmpXchgU64
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45 | %ifdef RT_ARCH_AMD64
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46 | %ifdef ASM_CALL64_MSC
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47 | mov rax, r8
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48 | lock cmpxchg [rcx], rdx
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49 | %else
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50 | mov rax, rdx
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51 | lock cmpxchg [rdi], rsi
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52 | %endif
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53 | setz al
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54 | movzx eax, al
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55 | ret
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56 | %endif
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57 | %ifdef RT_ARCH_X86
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58 | push ebp
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59 | mov ebp, esp
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60 | push ebx
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61 | push edi
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62 |
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63 | mov ebx, dword [ebp+0ch]
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64 | mov ecx, dword [ebp+0ch + 4]
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65 | mov edi, [ebp+08h]
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66 | mov eax, dword [ebp+14h]
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67 | mov edx, dword [ebp+14h + 4]
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68 | lock cmpxchg8b [edi]
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69 | setz al
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70 | movzx eax, al
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71 |
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72 | pop edi
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73 | pop ebx
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74 | leave
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75 | ret
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76 | %endif
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77 | ENDPROC ASMAtomicCmpXchgU64
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78 |
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