| 1 | ; $Id: tstX86-FpuSaveRestoreA.asm 93115 2022-01-01 11:31:46Z vboxsync $
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| 2 | ;; @file
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| 3 | ; tstX86-FpuSaveRestore - Experimenting with saving and restoring FPU, assembly bits.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2013-2022 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 |
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| 18 |
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| 19 |
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| 20 | ;*******************************************************************************
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| 21 | ;* Header Files *
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| 22 | ;*******************************************************************************
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| 23 | %include "iprt/asmdefs.mac"
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| 24 | %include "iprt/x86.mac"
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| 25 |
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| 26 |
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| 27 | ;*******************************************************************************
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| 28 | ;* Global Variables *
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| 29 | ;*******************************************************************************
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| 30 | BEGINCODE
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| 31 | g_r80_Zero: dt 0.0
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| 32 | g_r80_One: dt 1.0
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| 33 |
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| 34 |
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| 35 | BEGINCODE
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| 36 |
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| 37 | ;; Prepares a FPU exception.
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| 38 | BEGINPROC MyFpuPrepXcpt
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| 39 | fld tword [g_r80_One xWrtRIP]
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| 40 | fld tword [g_r80_Zero xWrtRIP]
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| 41 | fdiv st0
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| 42 | ret
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| 43 | ENDPROC MyFpuPrepXcpt
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| 44 |
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| 45 |
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| 46 | ;; Same as above, just different address.
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| 47 | BEGINPROC MyFpuPrepXcpt2
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| 48 | fld tword [g_r80_One xWrtRIP]
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| 49 | fld tword [g_r80_Zero xWrtRIP]
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| 50 | fdiv st0
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| 51 | ret
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| 52 | ENDPROC MyFpuPrepXcpt2
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| 53 |
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| 54 |
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| 55 | BEGINPROC MyFpuSave
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| 56 | %ifdef ASM_CALL64_MSC
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| 57 | o64 fxsave [rcx]
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| 58 | %elifdef ASM_CALL64_GCC
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| 59 | o64 fxsave [rdi]
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| 60 | %elifdef RT_ARCH_X86
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| 61 | mov ecx, [esp + 4]
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| 62 | fxsave [ecx]
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| 63 | %else
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| 64 | %error "Unsupported architecture."
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| 65 | bad arch
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| 66 | %endif
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| 67 | ret
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| 68 | ENDPROC MyFpuSave
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| 69 |
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| 70 |
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| 71 | BEGINPROC MyFpuStoreEnv
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| 72 | %ifdef ASM_CALL64_MSC
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| 73 | fstenv [rcx]
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| 74 | %elifdef ASM_CALL64_GCC
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| 75 | fstenv [rdi]
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| 76 | %elifdef RT_ARCH_X86
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| 77 | mov ecx, [esp + 4]
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| 78 | fstenv [ecx]
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| 79 | %else
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| 80 | %error "Unsupported architecture."
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| 81 | bad arch
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| 82 | %endif
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| 83 | ret
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| 84 | ENDPROC MyFpuStoreEnv
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| 85 |
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| 86 |
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| 87 | BEGINPROC MyFpuRestore
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| 88 | %ifdef ASM_CALL64_MSC
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| 89 | o64 fxrstor [rcx]
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| 90 | %elifdef ASM_CALL64_GCC
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| 91 | o64 fxrstor [rdi]
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| 92 | %elifdef RT_ARCH_X86
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| 93 | mov ecx, [esp + 4]
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| 94 | fxrstor [ecx]
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| 95 | %else
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| 96 | %error "Unsupported architecture."
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| 97 | bad arch
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| 98 | %endif
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| 99 | ret
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| 100 | ENDPROC MyFpuRestore
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| 101 |
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| 102 |
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| 103 | BEGINPROC MyFpuLoadEnv
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| 104 | %ifdef ASM_CALL64_MSC
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| 105 | fldenv [rcx]
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| 106 | %elifdef ASM_CALL64_GCC
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| 107 | fldenv [rdi]
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| 108 | %elifdef RT_ARCH_X86
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| 109 | mov ecx, [esp + 4]
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| 110 | fldenv [ecx]
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| 111 | %else
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| 112 | %error "Unsupported architecture."
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| 113 | bad arch
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| 114 | %endif
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| 115 | ret
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| 116 | ENDPROC MyFpuLoadEnv
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| 117 |
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