| 1 | /* $Id: tstX86-FpuSaveRestore.cpp 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.
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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 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #include <iprt/initterm.h>
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| 23 | #include <iprt/message.h>
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| 24 | #include <iprt/string.h>
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| 25 | #include <iprt/test.h>
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| 26 | #include <iprt/x86.h>
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| 27 |
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| 28 | DECLASM(void) MyFpuPrepXcpt(void);
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| 29 | DECLASM(void) MyFpuSave(PX86FXSTATE pState);
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| 30 | DECLASM(void) MyFpuStoreEnv(PX86FSTENV32P pEnv);
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| 31 | DECLASM(void) MyFpuRestore(PX86FXSTATE pState);
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| 32 | DECLASM(void) MyFpuLoadEnv(PX86FSTENV32P pEnv);
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| 33 |
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| 34 | int main()
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| 35 | {
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| 36 | RTTEST hTest;
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| 37 | int rc = RTTestInitAndCreate("tstX86-FpuSaveRestore", &hTest);
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| 38 | if (RT_FAILURE(rc))
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| 39 | return RTEXITCODE_FAILURE;
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| 40 | RTTestBanner(hTest);
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| 41 |
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| 42 | RTTestSub(hTest, "CS/DS Selector");
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| 43 |
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| 44 | RTTestIPrintf(RTTESTLVL_ALWAYS, "Initial state (0x20 will be subtracted from IP):\n");
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| 45 | /* Trigger an exception to make sure we've got something to look at. */
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| 46 | MyFpuPrepXcpt();
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| 47 | static X86FXSTATE FxState;
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| 48 | MyFpuSave(&FxState);
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| 49 | static X86FSTENV32P FpuEnv;
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| 50 | MyFpuStoreEnv(&FpuEnv);
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| 51 | #ifdef RT_ARCH_AMD64
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| 52 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FxState IP=%#06x%04x%08x\n", FxState.Rsrvd1, FxState.CS, FxState.FPUIP);
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| 53 | #else
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| 54 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FxState CS:IP=%#06x:%#010x\n", FxState.CS, FxState.FPUIP);
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| 55 | #endif
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| 56 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FpuEnv CS:IP=%#06x:%#010x\n", FpuEnv.FPUCS, FpuEnv.FPUIP);
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| 57 |
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| 58 | /* Modify the state a little so we can tell the difference. */
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| 59 | static X86FXSTATE FxState2;
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| 60 | FxState2 = FxState;
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| 61 | FxState2.FPUIP -= 0x20;
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| 62 | static X86FSTENV32P FpuEnv2;
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| 63 | FpuEnv2 = FpuEnv;
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| 64 | FpuEnv2.FPUIP -= 0x20;
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| 65 |
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| 66 | /* Just do FXRSTOR. */
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| 67 | RTTestIPrintf(RTTESTLVL_ALWAYS, "Just FXRSTOR:\n");
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| 68 | MyFpuRestore(&FxState2);
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| 69 |
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| 70 | static X86FXSTATE FxStateJustRestore;
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| 71 | MyFpuSave(&FxStateJustRestore);
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| 72 | static X86FSTENV32P FpuEnvJustRestore;
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| 73 | MyFpuStoreEnv(&FpuEnvJustRestore);
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| 74 | #ifdef RT_ARCH_AMD64
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| 75 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FxState IP=%#06x%04x%08x\n", FxStateJustRestore.Rsrvd1, FxStateJustRestore.CS, FxStateJustRestore.FPUIP);
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| 76 | #else
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| 77 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FxState CS:IP=%#06x:%#010x\n", FxStateJustRestore.CS, FxStateJustRestore.FPUIP);
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| 78 | #endif
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| 79 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FpuEnv CS:IP=%#06x:%#010x\n", FpuEnvJustRestore.FPUCS, FpuEnvJustRestore.FPUIP);
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| 80 |
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| 81 |
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| 82 | /* FXRSTORE + FLDENV */
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| 83 | RTTestIPrintf(RTTESTLVL_ALWAYS, "FXRSTOR first, then FLDENV:\n");
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| 84 | MyFpuRestore(&FxState2);
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| 85 | MyFpuLoadEnv(&FpuEnv2);
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| 86 |
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| 87 | static X86FXSTATE FxStateRestoreLoad;
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| 88 | MyFpuSave(&FxStateRestoreLoad);
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| 89 | static X86FSTENV32P FpuEnvRestoreLoad;
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| 90 | MyFpuStoreEnv(&FpuEnvRestoreLoad);
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| 91 | #ifdef RT_ARCH_AMD64
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| 92 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FxState IP=%#06x%04x%08x\n", FxStateRestoreLoad.Rsrvd1, FxStateRestoreLoad.CS, FxStateRestoreLoad.FPUIP);
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| 93 | #else
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| 94 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FxState CS:IP=%#06x:%#010x\n", FxStateRestoreLoad.CS, FxStateRestoreLoad.FPUIP);
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| 95 | #endif
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| 96 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FpuEnv CS:IP=%#06x:%#010x\n", FpuEnvRestoreLoad.FPUCS, FpuEnvRestoreLoad.FPUIP);
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| 97 |
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| 98 | /* Reverse the order (FLDENV + FXRSTORE). */
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| 99 | RTTestIPrintf(RTTESTLVL_ALWAYS, "FLDENV first, then FXRSTOR:\n");
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| 100 | MyFpuLoadEnv(&FpuEnv2);
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| 101 | MyFpuRestore(&FxState2);
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| 102 |
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| 103 | static X86FXSTATE FxStateLoadRestore;
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| 104 | MyFpuSave(&FxStateLoadRestore);
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| 105 | static X86FSTENV32P FpuEnvLoadRestore;
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| 106 | MyFpuStoreEnv(&FpuEnvLoadRestore);
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| 107 | #ifdef RT_ARCH_AMD64
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| 108 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FxState IP=%#06x%04x%08x\n", FxStateLoadRestore.Rsrvd1, FxStateLoadRestore.CS, FxStateLoadRestore.FPUIP);
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| 109 | #else
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| 110 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FxState CS:IP=%#06x:%#010x\n", FxStateLoadRestore.CS, FxStateLoadRestore.FPUIP);
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| 111 | #endif
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| 112 | RTTestIPrintf(RTTESTLVL_ALWAYS, " FpuEnv CS:IP=%#06x:%#010x\n", FpuEnvLoadRestore.FPUCS, FpuEnvLoadRestore.FPUIP);
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| 113 |
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| 114 |
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| 115 | return RTTestSummaryAndDestroy(hTest);
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| 116 | }
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