/* $Id: bs3-cpu-basic-2-template.c $ */ /** @file * BS3Kit - bs3-cpu-basic-2, C code template. */ /* * Copyright (C) 2007-2019 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. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include #include /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ #undef CHECK_MEMBER #define CHECK_MEMBER(a_szName, a_szFmt, a_Actual, a_Expected) \ do \ { \ if ((a_Actual) == (a_Expected)) { /* likely */ } \ else bs3CpuBasic2_FailedF(a_szName "=" a_szFmt " expected " a_szFmt, (a_Actual), (a_Expected)); \ } while (0) #ifdef BS3_INSTANTIATING_MODE # undef MyBs3Idt # undef MY_SYS_SEL_R0_CS # undef MY_SYS_SEL_R0_CS_CNF # undef MY_SYS_SEL_R0_DS # undef MY_SYS_SEL_R0_SS # if BS3_MODE_IS_16BIT_SYS(TMPL_MODE) # define MyBs3Idt Bs3Idt16 # define MY_SYS_SEL_R0_CS BS3_SEL_R0_CS16 # define MY_SYS_SEL_R0_CS_CNF BS3_SEL_R0_CS16_CNF # define MY_SYS_SEL_R0_DS BS3_SEL_R0_DS16 # define MY_SYS_SEL_R0_SS BS3_SEL_R0_SS16 # elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE) # define MyBs3Idt Bs3Idt32 # define MY_SYS_SEL_R0_CS BS3_SEL_R0_CS32 # define MY_SYS_SEL_R0_CS_CNF BS3_SEL_R0_CS32_CNF # define MY_SYS_SEL_R0_DS BS3_SEL_R0_DS32 # define MY_SYS_SEL_R0_SS BS3_SEL_R0_SS32 # elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE) # define MyBs3Idt Bs3Idt64 # define MY_SYS_SEL_R0_CS BS3_SEL_R0_CS64 # define MY_SYS_SEL_R0_CS_CNF BS3_SEL_R0_CS64_CNF # define MY_SYS_SEL_R0_DS BS3_SEL_R0_DS64 # define MY_SYS_SEL_R0_SS BS3_SEL_R0_DS64 # else # error "TMPL_MODE" # endif #endif /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ #ifdef BS3_INSTANTIATING_CMN typedef struct BS3CB2INVLDESCTYPE { uint8_t u4Type; uint8_t u1DescType; } BS3CB2INVLDESCTYPE; #endif /********************************************************************************************************************************* * External Symbols * *********************************************************************************************************************************/ #ifdef BS3_INSTANTIATING_CMN extern FNBS3FAR bs3CpuBasic2_Int80; extern FNBS3FAR bs3CpuBasic2_Int81; extern FNBS3FAR bs3CpuBasic2_Int82; extern FNBS3FAR bs3CpuBasic2_Int83; extern FNBS3FAR bs3CpuBasic2_ud2; # define g_bs3CpuBasic2_ud2_FlatAddr BS3_DATA_NM(g_bs3CpuBasic2_ud2_FlatAddr) extern uint32_t g_bs3CpuBasic2_ud2_FlatAddr; #endif /********************************************************************************************************************************* * Global Variables * *********************************************************************************************************************************/ #ifdef BS3_INSTANTIATING_CMN # define g_pszTestMode BS3_CMN_NM(g_pszTestMode) static const char BS3_FAR *g_pszTestMode = (const char *)1; # define g_bTestMode BS3_CMN_NM(g_bTestMode) static uint8_t g_bTestMode = 1; # define g_f16BitSys BS3_CMN_NM(g_f16BitSys) static bool g_f16BitSys = 1; /** Table containing invalid CS selector types. */ static const BS3CB2INVLDESCTYPE g_aInvalidCsTypes[] = { { X86_SEL_TYPE_RO, 1 }, { X86_SEL_TYPE_RO_ACC, 1 }, { X86_SEL_TYPE_RW, 1 }, { X86_SEL_TYPE_RW_ACC, 1 }, { X86_SEL_TYPE_RO_DOWN, 1 }, { X86_SEL_TYPE_RO_DOWN_ACC, 1 }, { X86_SEL_TYPE_RW_DOWN, 1 }, { X86_SEL_TYPE_RW_DOWN_ACC, 1 }, { 0, 0 }, { 1, 0 }, { 2, 0 }, { 3, 0 }, { 4, 0 }, { 5, 0 }, { 6, 0 }, { 7, 0 }, { 8, 0 }, { 9, 0 }, { 10, 0 }, { 11, 0 }, { 12, 0 }, { 13, 0 }, { 14, 0 }, { 15, 0 }, }; /** Table containing invalid SS selector types. */ static const BS3CB2INVLDESCTYPE g_aInvalidSsTypes[] = { { X86_SEL_TYPE_EO, 1 }, { X86_SEL_TYPE_EO_ACC, 1 }, { X86_SEL_TYPE_ER, 1 }, { X86_SEL_TYPE_ER_ACC, 1 }, { X86_SEL_TYPE_EO_CONF, 1 }, { X86_SEL_TYPE_EO_CONF_ACC, 1 }, { X86_SEL_TYPE_ER_CONF, 1 }, { X86_SEL_TYPE_ER_CONF_ACC, 1 }, { 0, 0 }, { 1, 0 }, { 2, 0 }, { 3, 0 }, { 4, 0 }, { 5, 0 }, { 6, 0 }, { 7, 0 }, { 8, 0 }, { 9, 0 }, { 10, 0 }, { 11, 0 }, { 12, 0 }, { 13, 0 }, { 14, 0 }, { 15, 0 }, }; #endif /* BS3_INSTANTIATING_CMN - global */ #ifdef BS3_INSTANTIATING_CMN /** * Wrapper around Bs3TestFailedF that prefixes the error with g_usBs3TestStep * and g_pszTestMode. */ # define bs3CpuBasic2_FailedF BS3_CMN_NM(bs3CpuBasic2_FailedF) BS3_DECL_NEAR(void) bs3CpuBasic2_FailedF(const char *pszFormat, ...) { va_list va; char szTmp[168]; va_start(va, pszFormat); Bs3StrPrintfV(szTmp, sizeof(szTmp), pszFormat, va); va_end(va); Bs3TestFailedF("%u - %s: %s", g_usBs3TestStep, g_pszTestMode, szTmp); } /** * Compares trap stuff. */ # define bs3CpuBasic2_CompareIntCtx1 BS3_CMN_NM(bs3CpuBasic2_CompareIntCtx1) BS3_DECL_NEAR(void) bs3CpuBasic2_CompareIntCtx1(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx, uint8_t bXcpt) { uint16_t const cErrorsBefore = Bs3TestSubErrorCount(); CHECK_MEMBER("bXcpt", "%#04x", pTrapCtx->bXcpt, bXcpt); CHECK_MEMBER("bErrCd", "%#06RX64", pTrapCtx->uErrCd, 0); Bs3TestCheckRegCtxEx(&pTrapCtx->Ctx, pStartCtx, 2 /*int xx*/, 0 /*cbSpAdjust*/, 0 /*fExtraEfl*/, g_pszTestMode, g_usBs3TestStep); if (Bs3TestSubErrorCount() != cErrorsBefore) { Bs3TrapPrintFrame(pTrapCtx); #if 1 Bs3TestPrintf("Halting: g_uBs3CpuDetected=%#x\n", g_uBs3CpuDetected); Bs3TestPrintf("Halting in CompareTrapCtx1: bXcpt=%#x\n", bXcpt); ASMHalt(); #endif } } /** * Compares trap stuff. */ # define bs3CpuBasic2_CompareTrapCtx2 BS3_CMN_NM(bs3CpuBasic2_CompareTrapCtx2) BS3_DECL_NEAR(void) bs3CpuBasic2_CompareTrapCtx2(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx, uint16_t cbIpAdjust, uint8_t bXcpt, uint16_t uHandlerCs) { uint16_t const cErrorsBefore = Bs3TestSubErrorCount(); CHECK_MEMBER("bXcpt", "%#04x", pTrapCtx->bXcpt, bXcpt); CHECK_MEMBER("bErrCd", "%#06RX64", pTrapCtx->uErrCd, 0); CHECK_MEMBER("uHandlerCs", "%#06x", pTrapCtx->uHandlerCs, uHandlerCs); Bs3TestCheckRegCtxEx(&pTrapCtx->Ctx, pStartCtx, cbIpAdjust, 0 /*cbSpAdjust*/, 0 /*fExtraEfl*/, g_pszTestMode, g_usBs3TestStep); if (Bs3TestSubErrorCount() != cErrorsBefore) { Bs3TrapPrintFrame(pTrapCtx); #if 1 Bs3TestPrintf("Halting: g_uBs3CpuDetected=%#x\n", g_uBs3CpuDetected); Bs3TestPrintf("Halting in CompareTrapCtx2: bXcpt=%#x\n", bXcpt); ASMHalt(); #endif } } /** * Compares a CPU trap. */ # define bs3CpuBasic2_CompareCpuTrapCtx BS3_CMN_NM(bs3CpuBasic2_CompareCpuTrapCtx) BS3_DECL_NEAR(void) bs3CpuBasic2_CompareCpuTrapCtx(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx, uint16_t uErrCd, uint8_t bXcpt, bool f486ResumeFlagHint) { uint16_t const cErrorsBefore = Bs3TestSubErrorCount(); uint32_t fExtraEfl; CHECK_MEMBER("bXcpt", "%#04x", pTrapCtx->bXcpt, bXcpt); CHECK_MEMBER("bErrCd", "%#06RX16", (uint16_t)pTrapCtx->uErrCd, (uint16_t)uErrCd); /* 486 only writes a word */ fExtraEfl = X86_EFL_RF; if ( g_f16BitSys || ( !f486ResumeFlagHint && (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) <= BS3CPU_80486 ) ) fExtraEfl = 0; else fExtraEfl = X86_EFL_RF; #if 0 /** @todo Running on an AMD Phenom II X6 1100T under AMD-V I'm not getting good X86_EFL_RF results. Enable this to get on with other work. */ fExtraEfl = pTrapCtx->Ctx.rflags.u32 & X86_EFL_RF; #endif Bs3TestCheckRegCtxEx(&pTrapCtx->Ctx, pStartCtx, 0 /*cbIpAdjust*/, 0 /*cbSpAdjust*/, fExtraEfl, g_pszTestMode, g_usBs3TestStep); if (Bs3TestSubErrorCount() != cErrorsBefore) { Bs3TrapPrintFrame(pTrapCtx); #if 1 Bs3TestPrintf("Halting: g_uBs3CpuDetected=%#x\n", g_uBs3CpuDetected); Bs3TestPrintf("Halting: bXcpt=%#x uErrCd=%#x\n", bXcpt, uErrCd); ASMHalt(); #endif } } /** * Compares \#GP trap. */ # define bs3CpuBasic2_CompareGpCtx BS3_CMN_NM(bs3CpuBasic2_CompareGpCtx) BS3_DECL_NEAR(void) bs3CpuBasic2_CompareGpCtx(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx, uint16_t uErrCd) { bs3CpuBasic2_CompareCpuTrapCtx(pTrapCtx, pStartCtx, uErrCd, X86_XCPT_GP, true /*f486ResumeFlagHint*/); } /** * Compares \#NP trap. */ # define bs3CpuBasic2_CompareNpCtx BS3_CMN_NM(bs3CpuBasic2_CompareNpCtx) BS3_DECL_NEAR(void) bs3CpuBasic2_CompareNpCtx(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx, uint16_t uErrCd) { bs3CpuBasic2_CompareCpuTrapCtx(pTrapCtx, pStartCtx, uErrCd, X86_XCPT_NP, true /*f486ResumeFlagHint*/); } /** * Compares \#SS trap. */ # define bs3CpuBasic2_CompareSsCtx BS3_CMN_NM(bs3CpuBasic2_CompareSsCtx) BS3_DECL_NEAR(void) bs3CpuBasic2_CompareSsCtx(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx, uint16_t uErrCd, bool f486ResumeFlagHint) { bs3CpuBasic2_CompareCpuTrapCtx(pTrapCtx, pStartCtx, uErrCd, X86_XCPT_SS, f486ResumeFlagHint); } /** * Compares \#TS trap. */ # define bs3CpuBasic2_CompareTsCtx BS3_CMN_NM(bs3CpuBasic2_CompareTsCtx) BS3_DECL_NEAR(void) bs3CpuBasic2_CompareTsCtx(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx, uint16_t uErrCd) { bs3CpuBasic2_CompareCpuTrapCtx(pTrapCtx, pStartCtx, uErrCd, X86_XCPT_TS, false /*f486ResumeFlagHint*/); } /** * Compares \#PF trap. */ # define bs3CpuBasic2_ComparePfCtx BS3_CMN_NM(bs3CpuBasic2_ComparePfCtx) BS3_DECL_NEAR(void) bs3CpuBasic2_ComparePfCtx(PCBS3TRAPFRAME pTrapCtx, PBS3REGCTX pStartCtx, uint16_t uErrCd, uint64_t uCr2Expected) { uint64_t const uCr2Saved = pStartCtx->cr2.u; pStartCtx->cr2.u = uCr2Expected; bs3CpuBasic2_CompareCpuTrapCtx(pTrapCtx, pStartCtx, uErrCd, X86_XCPT_PF, true /*f486ResumeFlagHint*/); pStartCtx->cr2.u = uCr2Saved; } /** * Compares \#UD trap. */ # define bs3CpuBasic2_CompareUdCtx BS3_CMN_NM(bs3CpuBasic2_CompareUdCtx) BS3_DECL_NEAR(void) bs3CpuBasic2_CompareUdCtx(PCBS3TRAPFRAME pTrapCtx, PCBS3REGCTX pStartCtx) { bs3CpuBasic2_CompareCpuTrapCtx(pTrapCtx, pStartCtx, 0 /*no error code*/, X86_XCPT_UD, true /*f486ResumeFlagHint*/); } # define bs3CpuBasic2_RaiseXcpt1Common BS3_CMN_NM(bs3CpuBasic2_RaiseXcpt1Common) BS3_DECL_NEAR(void) bs3CpuBasic2_RaiseXcpt1Common(uint16_t const uSysR0Cs, uint16_t const uSysR0CsConf, uint16_t const uSysR0Ss, PX86DESC const paIdt, unsigned const cIdteShift) { BS3TRAPFRAME TrapCtx; BS3REGCTX Ctx80; BS3REGCTX Ctx81; BS3REGCTX Ctx82; BS3REGCTX Ctx83; BS3REGCTX CtxTmp; BS3REGCTX CtxTmp2; PBS3REGCTX apCtx8x[4]; unsigned iCtx; unsigned iRing; unsigned iDpl; unsigned iRpl; unsigned i, j, k; uint32_t uExpected; bool const f486Plus = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486; # if TMPL_BITS == 16 bool const f386Plus = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386; bool const f286 = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) == BS3CPU_80286; # else bool const f286 = false; bool const f386Plus = true; int rc; uint8_t *pbIdtCopyAlloc; PX86DESC pIdtCopy; const unsigned cbIdte = 1 << (3 + cIdteShift); RTCCUINTXREG uCr0Saved = ASMGetCR0(); RTGDTR GdtrSaved; # endif RTIDTR IdtrSaved; RTIDTR Idtr; ASMGetIDTR(&IdtrSaved); # if TMPL_BITS != 16 ASMGetGDTR(&GdtrSaved); # endif /* make sure they're allocated */ Bs3MemZero(&TrapCtx, sizeof(TrapCtx)); Bs3MemZero(&Ctx80, sizeof(Ctx80)); Bs3MemZero(&Ctx81, sizeof(Ctx81)); Bs3MemZero(&Ctx82, sizeof(Ctx82)); Bs3MemZero(&Ctx83, sizeof(Ctx83)); Bs3MemZero(&CtxTmp, sizeof(CtxTmp)); Bs3MemZero(&CtxTmp2, sizeof(CtxTmp2)); /* Context array. */ apCtx8x[0] = &Ctx80; apCtx8x[1] = &Ctx81; apCtx8x[2] = &Ctx82; apCtx8x[3] = &Ctx83; # if TMPL_BITS != 16 /* Allocate memory for playing around with the IDT. */ pbIdtCopyAlloc = NULL; if (BS3_MODE_IS_PAGED(g_bTestMode)) pbIdtCopyAlloc = Bs3MemAlloc(BS3MEMKIND_FLAT32, 12*_1K); # endif /* * IDT entry 80 thru 83 are assigned DPLs according to the number. * (We'll be useing more, but this'll do for now.) */ paIdt[0x80 << cIdteShift].Gate.u2Dpl = 0; paIdt[0x81 << cIdteShift].Gate.u2Dpl = 1; paIdt[0x82 << cIdteShift].Gate.u2Dpl = 2; paIdt[0x83 << cIdteShift].Gate.u2Dpl = 3; Bs3RegCtxSave(&Ctx80); Ctx80.rsp.u -= 0x300; Ctx80.rip.u = (uintptr_t)BS3_FP_OFF(&bs3CpuBasic2_Int80); # if TMPL_BITS == 16 Ctx80.cs = BS3_MODE_IS_RM_OR_V86(g_bTestMode) ? BS3_SEL_TEXT16 : BS3_SEL_R0_CS16; # elif TMPL_BITS == 32 g_uBs3TrapEipHint = Ctx80.rip.u32; # endif Bs3MemCpy(&Ctx81, &Ctx80, sizeof(Ctx80)); Ctx81.rip.u = (uintptr_t)BS3_FP_OFF(&bs3CpuBasic2_Int81); Bs3MemCpy(&Ctx82, &Ctx80, sizeof(Ctx80)); Ctx82.rip.u = (uintptr_t)BS3_FP_OFF(&bs3CpuBasic2_Int82); Bs3MemCpy(&Ctx83, &Ctx80, sizeof(Ctx80)); Ctx83.rip.u = (uintptr_t)BS3_FP_OFF(&bs3CpuBasic2_Int83); /* * Check that all the above gates work from ring-0. */ for (iCtx = 0; iCtx < RT_ELEMENTS(apCtx8x); iCtx++) { g_usBs3TestStep = iCtx; # if TMPL_BITS == 32 g_uBs3TrapEipHint = apCtx8x[iCtx]->rip.u32; # endif Bs3TrapSetJmpAndRestore(apCtx8x[iCtx], &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, apCtx8x[iCtx], 0x80+iCtx /*bXcpt*/); } /* * Check that the gate DPL checks works. */ g_usBs3TestStep = 100; for (iRing = 0; iRing <= 3; iRing++) { for (iCtx = 0; iCtx < RT_ELEMENTS(apCtx8x); iCtx++) { Bs3MemCpy(&CtxTmp, apCtx8x[iCtx], sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, iRing); # if TMPL_BITS == 32 g_uBs3TrapEipHint = CtxTmp.rip.u32; # endif Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); if (iCtx < iRing) bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); else bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x80 + iCtx /*bXcpt*/); g_usBs3TestStep++; } } /* * Modify the gate CS value and run the handler at a different CPL. * Throw RPL variations into the mix (completely ignored) together * with gate presence. * 1. CPL <= GATE.DPL * 2. GATE.P * 3. GATE.CS.DPL <= CPL (non-conforming segments) */ g_usBs3TestStep = 1000; for (i = 0; i <= 3; i++) { for (iRing = 0; iRing <= 3; iRing++) { for (iCtx = 0; iCtx < RT_ELEMENTS(apCtx8x); iCtx++) { # if TMPL_BITS == 32 g_uBs3TrapEipHint = apCtx8x[iCtx]->rip.u32; # endif Bs3MemCpy(&CtxTmp, apCtx8x[iCtx], sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, iRing); for (j = 0; j <= 3; j++) { uint16_t const uCs = (uSysR0Cs | j) + (i << BS3_SEL_RING_SHIFT); for (k = 0; k < 2; k++) { g_usBs3TestStep++; /*Bs3TestPrintf("g_usBs3TestStep=%u iCtx=%u iRing=%u i=%u uCs=%04x\n", g_usBs3TestStep, iCtx, iRing, i, uCs);*/ paIdt[(0x80 + iCtx) << cIdteShift].Gate.u16Sel = uCs; paIdt[(0x80 + iCtx) << cIdteShift].Gate.u1Present = k; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); /*Bs3TrapPrintFrame(&TrapCtx);*/ if (iCtx < iRing) bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); else if (k == 0) bs3CpuBasic2_CompareNpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); else if (i > iRing) bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, uCs & X86_SEL_MASK_OFF_RPL); else { uint16_t uExpectedCs = uCs & X86_SEL_MASK_OFF_RPL; if (i <= iCtx && i <= iRing) uExpectedCs |= i; bs3CpuBasic2_CompareTrapCtx2(&TrapCtx, &CtxTmp, 2 /*int 8xh*/, 0x80 + iCtx /*bXcpt*/, uExpectedCs); } } } paIdt[(0x80 + iCtx) << cIdteShift].Gate.u16Sel = uSysR0Cs; paIdt[(0x80 + iCtx) << cIdteShift].Gate.u1Present = 1; } } } BS3_ASSERT(g_usBs3TestStep < 1600); /* * Various CS and SS related faults * * We temporarily reconfigure gate 80 and 83 with new CS selectors, the * latter have a CS.DPL of 2 for testing ring transisions and SS loading * without making it impossible to handle faults. */ g_usBs3TestStep = 1600; Bs3GdteTestPage00 = Bs3Gdt[uSysR0Cs >> X86_SEL_SHIFT]; Bs3GdteTestPage00.Gen.u1Present = 0; Bs3GdteTestPage00.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; paIdt[0x80 << cIdteShift].Gate.u16Sel = BS3_SEL_TEST_PAGE_00; /* CS.PRESENT = 0 */ Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareNpCtx(&TrapCtx, &Ctx80, BS3_SEL_TEST_PAGE_00); if (Bs3GdteTestPage00.Gen.u4Type & X86_SEL_TYPE_ACCESSED) bs3CpuBasic2_FailedF("selector was accessed"); g_usBs3TestStep++; /* Check that GATE.DPL is checked before CS.PRESENT. */ for (iRing = 1; iRing < 4; iRing++) { Bs3MemCpy(&CtxTmp, &Ctx80, sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, iRing); Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, (0x80 << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); if (Bs3GdteTestPage00.Gen.u4Type & X86_SEL_TYPE_ACCESSED) bs3CpuBasic2_FailedF("selector was accessed"); g_usBs3TestStep++; } /* CS.DPL mismatch takes precedence over CS.PRESENT = 0. */ Bs3GdteTestPage00.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareNpCtx(&TrapCtx, &Ctx80, BS3_SEL_TEST_PAGE_00); if (Bs3GdteTestPage00.Gen.u4Type & X86_SEL_TYPE_ACCESSED) bs3CpuBasic2_FailedF("CS selector was accessed"); g_usBs3TestStep++; for (iDpl = 1; iDpl < 4; iDpl++) { Bs3GdteTestPage00.Gen.u2Dpl = iDpl; Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareGpCtx(&TrapCtx, &Ctx80, BS3_SEL_TEST_PAGE_00); if (Bs3GdteTestPage00.Gen.u4Type & X86_SEL_TYPE_ACCESSED) bs3CpuBasic2_FailedF("CS selector was accessed"); g_usBs3TestStep++; } /* 1608: Check all the invalid CS selector types alone. */ Bs3GdteTestPage00 = Bs3Gdt[uSysR0Cs >> X86_SEL_SHIFT]; for (i = 0; i < RT_ELEMENTS(g_aInvalidCsTypes); i++) { Bs3GdteTestPage00.Gen.u4Type = g_aInvalidCsTypes[i].u4Type; Bs3GdteTestPage00.Gen.u1DescType = g_aInvalidCsTypes[i].u1DescType; Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareGpCtx(&TrapCtx, &Ctx80, BS3_SEL_TEST_PAGE_00); if (Bs3GdteTestPage00.Gen.u4Type != g_aInvalidCsTypes[i].u4Type) bs3CpuBasic2_FailedF("Invalid CS type %#x/%u -> %#x/%u\n", g_aInvalidCsTypes[i].u4Type, g_aInvalidCsTypes[i].u1DescType, Bs3GdteTestPage00.Gen.u4Type, Bs3GdteTestPage00.Gen.u1DescType); g_usBs3TestStep++; /* Incorrect CS.TYPE takes precedence over CS.PRESENT = 0. */ Bs3GdteTestPage00.Gen.u1Present = 0; Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareGpCtx(&TrapCtx, &Ctx80, BS3_SEL_TEST_PAGE_00); Bs3GdteTestPage00.Gen.u1Present = 1; g_usBs3TestStep++; } /* Fix CS again. */ Bs3GdteTestPage00 = Bs3Gdt[uSysR0Cs >> X86_SEL_SHIFT]; /* 1632: Test SS. */ if (!BS3_MODE_IS_64BIT_SYS(g_bTestMode)) { uint16_t BS3_FAR *puTssSs2 = BS3_MODE_IS_16BIT_SYS(g_bTestMode) ? &Bs3Tss16.ss2 : &Bs3Tss32.ss2; uint16_t const uSavedSs2 = *puTssSs2; X86DESC const SavedGate83 = paIdt[0x83 << cIdteShift]; /* Make the handler execute in ring-2. */ Bs3GdteTestPage02 = Bs3Gdt[(uSysR0Cs + (2 << BS3_SEL_RING_SHIFT)) >> X86_SEL_SHIFT]; Bs3GdteTestPage02.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; paIdt[0x83 << cIdteShift].Gate.u16Sel = BS3_SEL_TEST_PAGE_02 | 2; Bs3MemCpy(&CtxTmp, &Ctx83, sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, 3); /* yeah, from 3 so SS:xSP is reloaded. */ Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x83); if (!(Bs3GdteTestPage02.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("CS selector was not access"); g_usBs3TestStep++; /* Create a SS.DPL=2 stack segment and check that SS2.RPL matters and that we get #SS if the selector isn't present. */ i = 0; /* used for cycling thru invalid CS types */ for (k = 0; k < 10; k++) { /* k=0: present, k=1: not-present, k=2: present but very low limit, k=3: not-present, low limit. k=4: present, read-only. k=5: not-present, read-only. k=6: present, code-selector. k=7: not-present, code-selector. k=8: present, read-write / no access + system (=LDT). k=9: not-present, read-write / no access + system (=LDT). */ Bs3GdteTestPage03 = Bs3Gdt[(uSysR0Ss + (2 << BS3_SEL_RING_SHIFT)) >> X86_SEL_SHIFT]; Bs3GdteTestPage03.Gen.u1Present = !(k & 1); if (k >= 8) { Bs3GdteTestPage03.Gen.u1DescType = 0; /* system */ Bs3GdteTestPage03.Gen.u4Type = X86_SEL_TYPE_RW; /* = LDT */ } else if (k >= 6) Bs3GdteTestPage03.Gen.u4Type = X86_SEL_TYPE_ER; else if (k >= 4) Bs3GdteTestPage03.Gen.u4Type = X86_SEL_TYPE_RO; else if (k >= 2) { Bs3GdteTestPage03.Gen.u16LimitLow = 0x400; Bs3GdteTestPage03.Gen.u4LimitHigh = 0; Bs3GdteTestPage03.Gen.u1Granularity = 0; } for (iDpl = 0; iDpl < 4; iDpl++) { Bs3GdteTestPage03.Gen.u2Dpl = iDpl; for (iRpl = 0; iRpl < 4; iRpl++) { *puTssSs2 = BS3_SEL_TEST_PAGE_03 | iRpl; //Bs3TestPrintf("k=%u iDpl=%u iRpl=%u step=%u\n", k, iDpl, iRpl, g_usBs3TestStep); Bs3GdteTestPage02.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; Bs3GdteTestPage03.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); if (iRpl != 2 || iRpl != iDpl || k >= 4) bs3CpuBasic2_CompareTsCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_03); else if (k != 0) bs3CpuBasic2_CompareSsCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_03, k == 2 /*f486ResumeFlagHint*/); else { bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x83); if (TrapCtx.uHandlerSs != (BS3_SEL_TEST_PAGE_03 | 2)) bs3CpuBasic2_FailedF("uHandlerSs=%#x expected %#x\n", TrapCtx.uHandlerSs, BS3_SEL_TEST_PAGE_03 | 2); } if (!(Bs3GdteTestPage02.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("CS selector was not access"); if ( TrapCtx.bXcpt == 0x83 || (TrapCtx.bXcpt == X86_XCPT_SS && k == 2) ) { if (!(Bs3GdteTestPage03.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("SS selector was not accessed"); } else if (Bs3GdteTestPage03.Gen.u4Type & X86_SEL_TYPE_ACCESSED) bs3CpuBasic2_FailedF("SS selector was accessed"); g_usBs3TestStep++; /* +1: Modify the gate DPL to check that this is checked before SS.DPL and SS.PRESENT. */ paIdt[0x83 << cIdteShift].Gate.u2Dpl = 2; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, (0x83 << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); paIdt[0x83 << cIdteShift].Gate.u2Dpl = 3; g_usBs3TestStep++; /* +2: Check the CS.DPL check is done before the SS ones. Restoring the ring-0 INT 83 context triggers the CS.DPL < CPL check. */ Bs3TrapSetJmpAndRestore(&Ctx83, &TrapCtx); bs3CpuBasic2_CompareGpCtx(&TrapCtx, &Ctx83, BS3_SEL_TEST_PAGE_02); g_usBs3TestStep++; /* +3: Now mark the CS selector not present and check that that also triggers before SS stuff. */ Bs3GdteTestPage02.Gen.u1Present = 0; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareNpCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_02); Bs3GdteTestPage02.Gen.u1Present = 1; g_usBs3TestStep++; /* +4: Make the CS selector some invalid type and check it triggers before SS stuff. */ Bs3GdteTestPage02.Gen.u4Type = g_aInvalidCsTypes[i].u4Type; Bs3GdteTestPage02.Gen.u1DescType = g_aInvalidCsTypes[i].u1DescType; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_02); Bs3GdteTestPage02.Gen.u4Type = X86_SEL_TYPE_ER_ACC; Bs3GdteTestPage02.Gen.u1DescType = 1; g_usBs3TestStep++; /* +5: Now, make the CS selector limit too small and that it triggers after SS trouble. The 286 had a simpler approach to these GP(0). */ Bs3GdteTestPage02.Gen.u16LimitLow = 0; Bs3GdteTestPage02.Gen.u4LimitHigh = 0; Bs3GdteTestPage02.Gen.u1Granularity = 0; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); if (f286) bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, 0 /*uErrCd*/); else if (iRpl != 2 || iRpl != iDpl || k >= 4) bs3CpuBasic2_CompareTsCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_03); else if (k != 0) bs3CpuBasic2_CompareSsCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_03, k == 2 /*f486ResumeFlagHint*/); else bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, 0 /*uErrCd*/); Bs3GdteTestPage02 = Bs3Gdt[(uSysR0Cs + (2 << BS3_SEL_RING_SHIFT)) >> X86_SEL_SHIFT]; g_usBs3TestStep++; } } } /* Check all the invalid SS selector types alone. */ Bs3GdteTestPage02 = Bs3Gdt[(uSysR0Cs + (2 << BS3_SEL_RING_SHIFT)) >> X86_SEL_SHIFT]; Bs3GdteTestPage03 = Bs3Gdt[(uSysR0Ss + (2 << BS3_SEL_RING_SHIFT)) >> X86_SEL_SHIFT]; *puTssSs2 = BS3_SEL_TEST_PAGE_03 | 2; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x83); g_usBs3TestStep++; for (i = 0; i < RT_ELEMENTS(g_aInvalidSsTypes); i++) { Bs3GdteTestPage03.Gen.u4Type = g_aInvalidSsTypes[i].u4Type; Bs3GdteTestPage03.Gen.u1DescType = g_aInvalidSsTypes[i].u1DescType; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareTsCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_03); if (Bs3GdteTestPage03.Gen.u4Type != g_aInvalidSsTypes[i].u4Type) bs3CpuBasic2_FailedF("Invalid SS type %#x/%u -> %#x/%u\n", g_aInvalidSsTypes[i].u4Type, g_aInvalidSsTypes[i].u1DescType, Bs3GdteTestPage03.Gen.u4Type, Bs3GdteTestPage03.Gen.u1DescType); g_usBs3TestStep++; } /* * Continue the SS experiments with a expand down segment. We'll use * the same setup as we already have with gate 83h being DPL and * having CS.DPL=2. * * Expand down segments are weird. The valid area is practically speaking * reversed. So, a 16-bit segment with a limit of 0x6000 will have valid * addresses from 0xffff thru 0x6001. * * So, with expand down segments we can more easily cut partially into the * pushing of the iret frame and trigger more interesting behavior than * with regular "expand up" segments where the whole pushing area is either * all fine or not not fine. */ Bs3GdteTestPage02 = Bs3Gdt[(uSysR0Cs + (2 << BS3_SEL_RING_SHIFT)) >> X86_SEL_SHIFT]; Bs3GdteTestPage03 = Bs3Gdt[(uSysR0Ss + (2 << BS3_SEL_RING_SHIFT)) >> X86_SEL_SHIFT]; Bs3GdteTestPage03.Gen.u2Dpl = 2; Bs3GdteTestPage03.Gen.u4Type = X86_SEL_TYPE_RW_DOWN; *puTssSs2 = BS3_SEL_TEST_PAGE_03 | 2; /* First test, limit = max --> no bytes accessible --> #GP */ Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareSsCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_03, true /*f486ResumeFlagHint*/); /* Second test, limit = 0 --> all by zero byte accessible --> works */ Bs3GdteTestPage03.Gen.u16LimitLow = 0; Bs3GdteTestPage03.Gen.u4LimitHigh = 0; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x83); /* Modify the gate handler to be a dummy that immediately does UD2 and triggers #UD, then advance the limit down till we get the #UD. */ Bs3GdteTestPage03.Gen.u1Granularity = 0; Bs3MemCpy(&CtxTmp2, &CtxTmp, sizeof(CtxTmp2)); /* #UD result context */ if (g_f16BitSys) { CtxTmp2.rip.u = g_bs3CpuBasic2_ud2_FlatAddr - BS3_ADDR_BS3TEXT16; Bs3Trap16SetGate(0x83, X86_SEL_TYPE_SYS_286_INT_GATE, 3, BS3_SEL_TEST_PAGE_02, CtxTmp2.rip.u16, 0 /*cParams*/); CtxTmp2.rsp.u = Bs3Tss16.sp2 - 2*5; } else { CtxTmp2.rip.u = g_bs3CpuBasic2_ud2_FlatAddr; Bs3Trap32SetGate(0x83, X86_SEL_TYPE_SYS_386_INT_GATE, 3, BS3_SEL_TEST_PAGE_02, CtxTmp2.rip.u32, 0 /*cParams*/); CtxTmp2.rsp.u = Bs3Tss32.esp2 - 4*5; } CtxTmp2.bMode = g_bTestMode; /* g_bBs3CurrentMode not changed by the UD2 handler. */ CtxTmp2.cs = BS3_SEL_TEST_PAGE_02 | 2; CtxTmp2.ss = BS3_SEL_TEST_PAGE_03 | 2; CtxTmp2.bCpl = 2; /* test run. */ Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareUdCtx(&TrapCtx, &CtxTmp2); g_usBs3TestStep++; /* Real run. */ i = (g_f16BitSys ? 2 : 4) * 6 + 1; while (i-- > 0) { Bs3GdteTestPage03.Gen.u16LimitLow = CtxTmp2.rsp.u16 + i - 1; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); if (i > 0) bs3CpuBasic2_CompareSsCtx(&TrapCtx, &CtxTmp, BS3_SEL_TEST_PAGE_03, true /*f486ResumeFlagHint*/); else bs3CpuBasic2_CompareUdCtx(&TrapCtx, &CtxTmp2); g_usBs3TestStep++; } /* Do a run where we do the same-ring kind of access. */ Bs3RegCtxConvertToRingX(&CtxTmp, 2); if (g_f16BitSys) { CtxTmp2.rsp.u32 = CtxTmp.rsp.u32 - 2*3; i = 2*3 - 1; } else { CtxTmp2.rsp.u32 = CtxTmp.rsp.u32 - 4*3; i = 4*3 - 1; } CtxTmp.ss = BS3_SEL_TEST_PAGE_03 | 2; CtxTmp2.ds = CtxTmp.ds; CtxTmp2.es = CtxTmp.es; CtxTmp2.fs = CtxTmp.fs; CtxTmp2.gs = CtxTmp.gs; while (i-- > 0) { Bs3GdteTestPage03.Gen.u16LimitLow = CtxTmp2.rsp.u16 + i - 1; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); if (i > 0) bs3CpuBasic2_CompareSsCtx(&TrapCtx, &CtxTmp, 0 /*BS3_SEL_TEST_PAGE_03*/, true /*f486ResumeFlagHint*/); else bs3CpuBasic2_CompareUdCtx(&TrapCtx, &CtxTmp2); g_usBs3TestStep++; } *puTssSs2 = uSavedSs2; paIdt[0x83 << cIdteShift] = SavedGate83; } paIdt[0x80 << cIdteShift].Gate.u16Sel = uSysR0Cs; BS3_ASSERT(g_usBs3TestStep < 3000); /* * Modify the gate CS value with a conforming segment. */ g_usBs3TestStep = 3000; for (i = 0; i <= 3; i++) /* cs.dpl */ { for (iRing = 0; iRing <= 3; iRing++) { for (iCtx = 0; iCtx < RT_ELEMENTS(apCtx8x); iCtx++) { Bs3MemCpy(&CtxTmp, apCtx8x[iCtx], sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, iRing); # if TMPL_BITS == 32 g_uBs3TrapEipHint = CtxTmp.rip.u32; # endif for (j = 0; j <= 3; j++) /* rpl */ { uint16_t const uCs = (uSysR0CsConf | j) + (i << BS3_SEL_RING_SHIFT); /*Bs3TestPrintf("g_usBs3TestStep=%u iCtx=%u iRing=%u i=%u uCs=%04x\n", g_usBs3TestStep, iCtx, iRing, i, uCs);*/ paIdt[(0x80 + iCtx) << cIdteShift].Gate.u16Sel = uCs; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); //Bs3TestPrintf("%u/%u/%u/%u: cs=%04x hcs=%04x xcpt=%02x\n", i, iRing, iCtx, j, uCs, TrapCtx.uHandlerCs, TrapCtx.bXcpt); /*Bs3TrapPrintFrame(&TrapCtx);*/ g_usBs3TestStep++; if (iCtx < iRing) bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); else if (i > iRing) bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, uCs & X86_SEL_MASK_OFF_RPL); else bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x80 + iCtx /*bXcpt*/); } paIdt[(0x80 + iCtx) << cIdteShift].Gate.u16Sel = uSysR0Cs; } } } BS3_ASSERT(g_usBs3TestStep < 3500); /* * The gates must be 64-bit in long mode. */ if (cIdteShift != 0) { g_usBs3TestStep = 3500; for (i = 0; i <= 3; i++) { for (iRing = 0; iRing <= 3; iRing++) { for (iCtx = 0; iCtx < RT_ELEMENTS(apCtx8x); iCtx++) { Bs3MemCpy(&CtxTmp, apCtx8x[iCtx], sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, iRing); for (j = 0; j < 2; j++) { static const uint16_t s_auCSes[2] = { BS3_SEL_R0_CS16, BS3_SEL_R0_CS32 }; uint16_t uCs = (s_auCSes[j] | i) + (i << BS3_SEL_RING_SHIFT); g_usBs3TestStep++; /*Bs3TestPrintf("g_usBs3TestStep=%u iCtx=%u iRing=%u i=%u uCs=%04x\n", g_usBs3TestStep, iCtx, iRing, i, uCs);*/ paIdt[(0x80 + iCtx) << cIdteShift].Gate.u16Sel = uCs; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); /*Bs3TrapPrintFrame(&TrapCtx);*/ if (iCtx < iRing) bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); else bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, uCs & X86_SEL_MASK_OFF_RPL); } paIdt[(0x80 + iCtx) << cIdteShift].Gate.u16Sel = uSysR0Cs; } } } BS3_ASSERT(g_usBs3TestStep < 4000); } /* * IDT limit check. The 286 does not access X86DESCGATE::u16OffsetHigh. */ g_usBs3TestStep = 5000; i = (0x80 << (cIdteShift + 3)) - 1; j = (0x82 << (cIdteShift + 3)) - (!f286 ? 1 : 3); k = (0x83 << (cIdteShift + 3)) - 1; for (; i <= k; i++, g_usBs3TestStep++) { Idtr = IdtrSaved; Idtr.cbIdt = i; ASMSetIDTR(&Idtr); Bs3TrapSetJmpAndRestore(&Ctx81, &TrapCtx); if (i < j) bs3CpuBasic2_CompareGpCtx(&TrapCtx, &Ctx81, (0x81 << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); else bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx81, 0x81 /*bXcpt*/); } ASMSetIDTR(&IdtrSaved); BS3_ASSERT(g_usBs3TestStep < 5100); # if TMPL_BITS != 16 /* Only do the paging related stuff in 32-bit and 64-bit modes. */ /* * IDT page not present. Placing the IDT copy such that 0x80 is on the * first page and 0x81 is on the second page. We need proceed to move * it down byte by byte to check that any inaccessible byte means #PF. * * Note! We must reload the alternative IDTR for each run as any kind of * printing to the string (like error reporting) will cause a switch * to real mode and back, reloading the default IDTR. */ g_usBs3TestStep = 5200; if (BS3_MODE_IS_PAGED(g_bTestMode) && pbIdtCopyAlloc) { uint32_t const uCr2Expected = Bs3SelPtrToFlat(pbIdtCopyAlloc) + _4K; for (j = 0; j < cbIdte; j++) { pIdtCopy = (PX86DESC)&pbIdtCopyAlloc[_4K - cbIdte * 0x81 - j]; Bs3MemCpy(pIdtCopy, paIdt, cbIdte * 256); Idtr.cbIdt = IdtrSaved.cbIdt; Idtr.pIdt = Bs3SelPtrToFlat(pIdtCopy); ASMSetIDTR(&Idtr); Bs3TrapSetJmpAndRestore(&Ctx81, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx81, 0x81 /*bXcpt*/); g_usBs3TestStep++; ASMSetIDTR(&Idtr); Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx80, 0x80 /*bXcpt*/); g_usBs3TestStep++; rc = Bs3PagingProtect(uCr2Expected, _4K, 0 /*fSet*/, X86_PTE_P /*fClear*/); if (RT_SUCCESS(rc)) { ASMSetIDTR(&Idtr); Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx80, 0x80 /*bXcpt*/); g_usBs3TestStep++; ASMSetIDTR(&Idtr); Bs3TrapSetJmpAndRestore(&Ctx81, &TrapCtx); if (f486Plus) bs3CpuBasic2_ComparePfCtx(&TrapCtx, &Ctx81, 0 /*uErrCd*/, uCr2Expected); else bs3CpuBasic2_ComparePfCtx(&TrapCtx, &Ctx81, X86_TRAP_PF_RW /*uErrCd*/, uCr2Expected + 4 - RT_MIN(j, 4)); g_usBs3TestStep++; Bs3PagingProtect(uCr2Expected, _4K, X86_PTE_P /*fSet*/, 0 /*fClear*/); /* Check if that the entry type is checked after the whole IDTE has been cleared for #PF. */ pIdtCopy[0x80 << cIdteShift].Gate.u4Type = 0; rc = Bs3PagingProtect(uCr2Expected, _4K, 0 /*fSet*/, X86_PTE_P /*fClear*/); if (RT_SUCCESS(rc)) { ASMSetIDTR(&Idtr); Bs3TrapSetJmpAndRestore(&Ctx81, &TrapCtx); if (f486Plus) bs3CpuBasic2_ComparePfCtx(&TrapCtx, &Ctx81, 0 /*uErrCd*/, uCr2Expected); else bs3CpuBasic2_ComparePfCtx(&TrapCtx, &Ctx81, X86_TRAP_PF_RW /*uErrCd*/, uCr2Expected + 4 - RT_MIN(j, 4)); g_usBs3TestStep++; Bs3PagingProtect(uCr2Expected, _4K, X86_PTE_P /*fSet*/, 0 /*fClear*/); } } else Bs3TestPrintf("Bs3PagingProtectPtr: %d\n", i); ASMSetIDTR(&IdtrSaved); } } /* * The read/write and user/supervisor bits the IDT PTEs are irrelevant. */ g_usBs3TestStep = 5300; if (BS3_MODE_IS_PAGED(g_bTestMode) && pbIdtCopyAlloc) { Bs3MemCpy(pbIdtCopyAlloc, paIdt, cbIdte * 256); Idtr.cbIdt = IdtrSaved.cbIdt; Idtr.pIdt = Bs3SelPtrToFlat(pbIdtCopyAlloc); ASMSetIDTR(&Idtr); Bs3TrapSetJmpAndRestore(&Ctx81, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx81, 0x81 /*bXcpt*/); g_usBs3TestStep++; rc = Bs3PagingProtect(Idtr.pIdt, _4K, 0 /*fSet*/, X86_PTE_RW | X86_PTE_US /*fClear*/); if (RT_SUCCESS(rc)) { ASMSetIDTR(&Idtr); Bs3TrapSetJmpAndRestore(&Ctx81, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx81, 0x81 /*bXcpt*/); g_usBs3TestStep++; Bs3PagingProtect(Idtr.pIdt, _4K, X86_PTE_RW | X86_PTE_US /*fSet*/, 0 /*fClear*/); } ASMSetIDTR(&IdtrSaved); } /* * Check that CS.u1Accessed is set to 1. Use the test page selector #0 and #3 together * with interrupt gates 80h and 83h, respectively. */ /** @todo Throw in SS.u1Accessed too. */ g_usBs3TestStep = 5400; if (BS3_MODE_IS_PAGED(g_bTestMode) && pbIdtCopyAlloc) { Bs3GdteTestPage00 = Bs3Gdt[uSysR0Cs >> X86_SEL_SHIFT]; Bs3GdteTestPage00.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; paIdt[0x80 << cIdteShift].Gate.u16Sel = BS3_SEL_TEST_PAGE_00; Bs3GdteTestPage03 = Bs3Gdt[(uSysR0Cs + (3 << BS3_SEL_RING_SHIFT)) >> X86_SEL_SHIFT]; Bs3GdteTestPage03.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; paIdt[0x83 << cIdteShift].Gate.u16Sel = BS3_SEL_TEST_PAGE_03; /* rpl is ignored, so leave it as zero. */ /* Check that the CS.A bit is being set on a general basis and that the special CS values work with out generic handler code. */ Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx80, 0x80 /*bXcpt*/); if (!(Bs3GdteTestPage00.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("u4Type=%#x, not accessed", Bs3GdteTestPage00.Gen.u4Type); g_usBs3TestStep++; Bs3MemCpy(&CtxTmp, &Ctx83, sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, 3); Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x83 /*bXcpt*/); if (!(Bs3GdteTestPage03.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("u4Type=%#x, not accessed!", Bs3GdteTestPage00.Gen.u4Type); if (TrapCtx.uHandlerCs != (BS3_SEL_TEST_PAGE_03 | 3)) bs3CpuBasic2_FailedF("uHandlerCs=%#x, expected %#x", TrapCtx.uHandlerCs, (BS3_SEL_TEST_PAGE_03 | 3)); g_usBs3TestStep++; /* * Now check that setting CS.u1Access to 1 does __NOT__ trigger a page * fault due to the RW bit being zero. * (We check both with with and without the WP bit if 80486.) */ if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486) ASMSetCR0(uCr0Saved | X86_CR0_WP); Bs3GdteTestPage00.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; Bs3GdteTestPage03.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; rc = Bs3PagingProtect(GdtrSaved.pGdt + BS3_SEL_TEST_PAGE_00, 8, 0 /*fSet*/, X86_PTE_RW /*fClear*/); if (RT_SUCCESS(rc)) { /* ring-0 handler */ Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx80, 0x80 /*bXcpt*/); if (!(Bs3GdteTestPage00.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("u4Type=%#x, not accessed!", Bs3GdteTestPage00.Gen.u4Type); g_usBs3TestStep++; /* ring-3 handler */ Bs3MemCpy(&CtxTmp, &Ctx83, sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, 3); Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x83 /*bXcpt*/); if (!(Bs3GdteTestPage03.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("u4Type=%#x, not accessed!", Bs3GdteTestPage00.Gen.u4Type); g_usBs3TestStep++; /* clear WP and repeat the above. */ if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486) ASMSetCR0(uCr0Saved & ~X86_CR0_WP); Bs3GdteTestPage00.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; /* (No need to RW the page - ring-0, WP=0.) */ Bs3GdteTestPage03.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; /* (No need to RW the page - ring-0, WP=0.) */ Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx80, 0x80 /*bXcpt*/); if (!(Bs3GdteTestPage00.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("u4Type=%#x, not accessed!", Bs3GdteTestPage00.Gen.u4Type); g_usBs3TestStep++; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x83 /*bXcpt*/); if (!(Bs3GdteTestPage03.Gen.u4Type & X86_SEL_TYPE_ACCESSED)) bs3CpuBasic2_FailedF("u4Type=%#x, not accessed!n", Bs3GdteTestPage03.Gen.u4Type); g_usBs3TestStep++; Bs3PagingProtect(GdtrSaved.pGdt + BS3_SEL_TEST_PAGE_00, 8, X86_PTE_RW /*fSet*/, 0 /*fClear*/); } ASMSetCR0(uCr0Saved); /* * While we're here, check that if the CS GDT entry is a non-present * page we do get a #PF with the rigth error code and CR2. */ Bs3GdteTestPage00.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; /* Just for fun, really a pointless gesture. */ Bs3GdteTestPage03.Gen.u4Type &= ~X86_SEL_TYPE_ACCESSED; rc = Bs3PagingProtect(GdtrSaved.pGdt + BS3_SEL_TEST_PAGE_00, 8, 0 /*fSet*/, X86_PTE_P /*fClear*/); if (RT_SUCCESS(rc)) { Bs3TrapSetJmpAndRestore(&Ctx80, &TrapCtx); if (f486Plus) bs3CpuBasic2_ComparePfCtx(&TrapCtx, &Ctx80, 0 /*uErrCd*/, GdtrSaved.pGdt + BS3_SEL_TEST_PAGE_00); else bs3CpuBasic2_ComparePfCtx(&TrapCtx, &Ctx80, X86_TRAP_PF_RW, GdtrSaved.pGdt + BS3_SEL_TEST_PAGE_00 + 4); g_usBs3TestStep++; /* Do it from ring-3 to check ErrCd, which doesn't set X86_TRAP_PF_US it turns out. */ Bs3MemCpy(&CtxTmp, &Ctx83, sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, 3); Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); if (f486Plus) bs3CpuBasic2_ComparePfCtx(&TrapCtx, &CtxTmp, 0 /*uErrCd*/, GdtrSaved.pGdt + BS3_SEL_TEST_PAGE_03); else bs3CpuBasic2_ComparePfCtx(&TrapCtx, &CtxTmp, X86_TRAP_PF_RW, GdtrSaved.pGdt + BS3_SEL_TEST_PAGE_03 + 4); g_usBs3TestStep++; Bs3PagingProtect(GdtrSaved.pGdt + BS3_SEL_TEST_PAGE_00, 8, X86_PTE_P /*fSet*/, 0 /*fClear*/); if (Bs3GdteTestPage00.Gen.u4Type & X86_SEL_TYPE_ACCESSED) bs3CpuBasic2_FailedF("u4Type=%#x, accessed! #1", Bs3GdteTestPage00.Gen.u4Type); if (Bs3GdteTestPage03.Gen.u4Type & X86_SEL_TYPE_ACCESSED) bs3CpuBasic2_FailedF("u4Type=%#x, accessed! #2", Bs3GdteTestPage03.Gen.u4Type); } /* restore */ paIdt[0x80 << cIdteShift].Gate.u16Sel = uSysR0Cs; paIdt[0x83 << cIdteShift].Gate.u16Sel = uSysR0Cs;// + (3 << BS3_SEL_RING_SHIFT) + 3; } # endif /* 32 || 64*/ /* * Check broad EFLAGS effects. */ g_usBs3TestStep = 5600; for (iCtx = 0; iCtx < RT_ELEMENTS(apCtx8x); iCtx++) { for (iRing = 0; iRing < 4; iRing++) { Bs3MemCpy(&CtxTmp, apCtx8x[iCtx], sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, iRing); /* all set */ CtxTmp.rflags.u32 &= X86_EFL_VM | X86_EFL_1; CtxTmp.rflags.u32 |= X86_EFL_CF | X86_EFL_PF | X86_EFL_AF | X86_EFL_ZF | X86_EFL_SF /* | X86_EFL_TF */ /*| X86_EFL_IF*/ | X86_EFL_DF | X86_EFL_OF | X86_EFL_IOPL /* | X86_EFL_NT*/; if (f486Plus) CtxTmp.rflags.u32 |= X86_EFL_AC; if (f486Plus && !g_f16BitSys) CtxTmp.rflags.u32 |= X86_EFL_RF; if (g_uBs3CpuDetected & BS3CPU_F_CPUID) CtxTmp.rflags.u32 |= X86_EFL_VIF | X86_EFL_VIP; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); CtxTmp.rflags.u32 &= ~X86_EFL_RF; if (iCtx >= iRing) bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x80 + iCtx /*bXcpt*/); else bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); uExpected = CtxTmp.rflags.u32 & ( X86_EFL_1 | X86_EFL_CF | X86_EFL_PF | X86_EFL_AF | X86_EFL_ZF | X86_EFL_SF | X86_EFL_DF | X86_EFL_OF | X86_EFL_IOPL | X86_EFL_NT | X86_EFL_VM | X86_EFL_AC | X86_EFL_VIF | X86_EFL_VIP | X86_EFL_ID /*| X86_EFL_TF*/ /*| X86_EFL_IF*/ /*| X86_EFL_RF*/ ); if (TrapCtx.fHandlerRfl != uExpected) bs3CpuBasic2_FailedF("unexpected handler rflags value: %RX64 expected %RX32; CtxTmp.rflags=%RX64 Ctx.rflags=%RX64\n", TrapCtx.fHandlerRfl, uExpected, CtxTmp.rflags.u, TrapCtx.Ctx.rflags.u); g_usBs3TestStep++; /* all cleared */ if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) < BS3CPU_80286) CtxTmp.rflags.u32 = apCtx8x[iCtx]->rflags.u32 & (X86_EFL_RA1_MASK | UINT16_C(0xf000)); else CtxTmp.rflags.u32 = apCtx8x[iCtx]->rflags.u32 & (X86_EFL_VM | X86_EFL_RA1_MASK); Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); if (iCtx >= iRing) bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &CtxTmp, 0x80 + iCtx /*bXcpt*/); else bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); uExpected = CtxTmp.rflags.u32; if (TrapCtx.fHandlerRfl != uExpected) bs3CpuBasic2_FailedF("unexpected handler rflags value: %RX64 expected %RX32; CtxTmp.rflags=%RX64 Ctx.rflags=%RX64\n", TrapCtx.fHandlerRfl, uExpected, CtxTmp.rflags.u, TrapCtx.Ctx.rflags.u); g_usBs3TestStep++; } } /** @todo CS.LIMIT / canonical(CS) */ /* * Check invalid gate types. */ g_usBs3TestStep = 32000; for (iRing = 0; iRing <= 3; iRing++) { static const uint16_t s_auCSes[] = { BS3_SEL_R0_CS16, BS3_SEL_R0_CS32, BS3_SEL_R0_CS64, BS3_SEL_TSS16, BS3_SEL_TSS32, BS3_SEL_TSS64, 0, BS3_SEL_SPARE_1f }; static uint16_t const s_auInvlTypes64[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f }; static uint16_t const s_auInvlTypes32[] = { 0, 1, 2, 3, 8, 9, 10, 11, 13, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /*286:*/ 12, 14, 15 }; uint16_t const * const pauInvTypes = cIdteShift != 0 ? s_auInvlTypes64 : s_auInvlTypes32; uint16_t const cInvTypes = cIdteShift != 0 ? RT_ELEMENTS(s_auInvlTypes64) : f386Plus ? RT_ELEMENTS(s_auInvlTypes32) - 3 : RT_ELEMENTS(s_auInvlTypes32); for (iCtx = 0; iCtx < RT_ELEMENTS(apCtx8x); iCtx++) { unsigned iType; Bs3MemCpy(&CtxTmp, apCtx8x[iCtx], sizeof(CtxTmp)); Bs3RegCtxConvertToRingX(&CtxTmp, iRing); # if TMPL_BITS == 32 g_uBs3TrapEipHint = CtxTmp.rip.u32; # endif for (iType = 0; iType < cInvTypes; iType++) { uint8_t const bSavedType = paIdt[(0x80 + iCtx) << cIdteShift].Gate.u4Type; paIdt[(0x80 + iCtx) << cIdteShift].Gate.u1DescType = pauInvTypes[iType] >> 4; paIdt[(0x80 + iCtx) << cIdteShift].Gate.u4Type = pauInvTypes[iType] & 0xf; for (i = 0; i < 4; i++) { for (j = 0; j < RT_ELEMENTS(s_auCSes); j++) { uint16_t uCs = (unsigned)(s_auCSes[j] - BS3_SEL_R0_FIRST) < (unsigned)(4 << BS3_SEL_RING_SHIFT) ? (s_auCSes[j] | i) + (i << BS3_SEL_RING_SHIFT) : s_auCSes[j] | i; /*Bs3TestPrintf("g_usBs3TestStep=%u iCtx=%u iRing=%u i=%u uCs=%04x type=%#x\n", g_usBs3TestStep, iCtx, iRing, i, uCs, pauInvTypes[iType]);*/ paIdt[(0x80 + iCtx) << cIdteShift].Gate.u16Sel = uCs; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); g_usBs3TestStep++; bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); /* Mark it not-present to check that invalid type takes precedence. */ paIdt[(0x80 + iCtx) << cIdteShift].Gate.u1Present = 0; Bs3TrapSetJmpAndRestore(&CtxTmp, &TrapCtx); g_usBs3TestStep++; bs3CpuBasic2_CompareGpCtx(&TrapCtx, &CtxTmp, ((0x80 + iCtx) << X86_TRAP_ERR_SEL_SHIFT) | X86_TRAP_ERR_IDT); paIdt[(0x80 + iCtx) << cIdteShift].Gate.u1Present = 1; } } paIdt[(0x80 + iCtx) << cIdteShift].Gate.u16Sel = uSysR0Cs; paIdt[(0x80 + iCtx) << cIdteShift].Gate.u4Type = bSavedType; paIdt[(0x80 + iCtx) << cIdteShift].Gate.u1DescType = 0; paIdt[(0x80 + iCtx) << cIdteShift].Gate.u1Present = 1; } } } BS3_ASSERT(g_usBs3TestStep < 62000U && g_usBs3TestStep > 32000U); /** @todo * - Run \#PF and \#GP (and others?) at CPLs other than zero. * - Quickly generate all faults. * - All the peculiarities v8086. */ # if TMPL_BITS != 16 Bs3MemFree(pbIdtCopyAlloc, 12*_1K); # endif } # if ARCH_BITS != 64 /** * Worker for bs3CpuBasic2_TssGateEsp that tests the INT 80 from outer rings. */ # define bs3CpuBasic2_TssGateEsp_AltStackOuterRing BS3_CMN_NM(bs3CpuBasic2_TssGateEsp_AltStackOuterRing) BS3_DECL_NEAR(void) bs3CpuBasic2_TssGateEsp_AltStackOuterRing(PCBS3REGCTX pCtx, uint8_t bRing, uint8_t *pbAltStack, size_t cbAltStack, bool f16BitStack, bool f16BitTss, bool f16BitHandler, unsigned uLine) { uint8_t const cbIretFrame = f16BitHandler ? 5*2 : 5*4; BS3REGCTX Ctx2; BS3TRAPFRAME TrapCtx; uint8_t *pbTmp; g_usBs3TestStep = uLine; Bs3MemCpy(&Ctx2, pCtx, sizeof(Ctx2)); Bs3RegCtxConvertToRingX(&Ctx2, bRing); if (pbAltStack) { Ctx2.rsp.u = Bs3SelPtrToFlat(pbAltStack + 0x1980); Bs3MemZero(pbAltStack, cbAltStack); } Bs3TrapSetJmpAndRestore(&Ctx2, &TrapCtx); if (!f16BitStack && f16BitTss) Ctx2.rsp.u &= UINT16_MAX; bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx2, 0x80 /*bXcpt*/); CHECK_MEMBER("bCpl", "%u", TrapCtx.Ctx.bCpl, bRing); CHECK_MEMBER("cbIretFrame", "%#x", TrapCtx.cbIretFrame, cbIretFrame); if (pbAltStack) { uint64_t uExpectedRsp = (f16BitTss ? Bs3Tss16.sp0 : Bs3Tss32.esp0) - cbIretFrame; if (f16BitStack) { uExpectedRsp &= UINT16_MAX; uExpectedRsp |= Ctx2.rsp.u & ~(uint64_t)UINT16_MAX; } if ( TrapCtx.uHandlerRsp != uExpectedRsp || TrapCtx.uHandlerSs != (f16BitTss ? Bs3Tss16.ss0 : Bs3Tss32.ss0)) bs3CpuBasic2_FailedF("handler SS:ESP=%04x:%08RX64, expected %04x:%08RX16", TrapCtx.uHandlerSs, TrapCtx.uHandlerRsp, Bs3Tss16.ss0, uExpectedRsp); pbTmp = (uint8_t *)ASMMemFirstNonZero(pbAltStack, cbAltStack); if ((f16BitStack || TrapCtx.uHandlerRsp <= UINT16_MAX) && pbTmp != NULL) bs3CpuBasic2_FailedF("someone touched the alt stack (%p) with SS:ESP=%04x:%#RX32: %p=%02x", pbAltStack, Ctx2.ss, Ctx2.rsp.u32, pbTmp, *pbTmp); else if (!f16BitStack && TrapCtx.uHandlerRsp > UINT16_MAX && pbTmp == NULL) bs3CpuBasic2_FailedF("the alt stack (%p) was not used SS:ESP=%04x:%#RX32\n", pbAltStack, Ctx2.ss, Ctx2.rsp.u32); } } # define bs3CpuBasic2_TssGateEspCommon BS3_CMN_NM(bs3CpuBasic2_TssGateEspCommon) BS3_DECL_NEAR(void) bs3CpuBasic2_TssGateEspCommon(bool const g_f16BitSys, PX86DESC const paIdt, unsigned const cIdteShift) { BS3TRAPFRAME TrapCtx; BS3REGCTX Ctx; BS3REGCTX Ctx2; # if TMPL_BITS == 16 uint8_t *pbTmp; # endif /* make sure they're allocated */ Bs3MemZero(&Ctx, sizeof(Ctx)); Bs3MemZero(&Ctx2, sizeof(Ctx2)); Bs3MemZero(&TrapCtx, sizeof(TrapCtx)); Bs3RegCtxSave(&Ctx); Ctx.rsp.u -= 0x80; Bs3RegCtxSetRipCsFromLnkPtr(&Ctx, bs3CpuBasic2_Int80); # if TMPL_BITS == 32 g_uBs3TrapEipHint = Ctx.rip.u32; # endif /* * We'll be using IDT entry 80 and 81 here. The first one will be * accessible from all DPLs, the latter not. So, start with setting * the DPLs. */ paIdt[0x80 << cIdteShift].Gate.u2Dpl = 3; paIdt[0x81 << cIdteShift].Gate.u2Dpl = 0; /* * Check that the basic stuff works first. */ Bs3TrapSetJmpAndRestore(&Ctx, &TrapCtx); g_usBs3TestStep = __LINE__; bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx, 0x80 /*bXcpt*/); bs3CpuBasic2_TssGateEsp_AltStackOuterRing(&Ctx, 1, NULL, 0, g_f16BitSys, g_f16BitSys, g_f16BitSys, __LINE__); bs3CpuBasic2_TssGateEsp_AltStackOuterRing(&Ctx, 2, NULL, 0, g_f16BitSys, g_f16BitSys, g_f16BitSys, __LINE__); bs3CpuBasic2_TssGateEsp_AltStackOuterRing(&Ctx, 3, NULL, 0, g_f16BitSys, g_f16BitSys, g_f16BitSys, __LINE__); /* * Check that the upper part of ESP is preserved when doing . */ if ((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386) { size_t const cbAltStack = _8K; uint8_t *pbAltStack = Bs3MemAllocZ(BS3MEMKIND_TILED, cbAltStack); if (pbAltStack) { /* same ring */ g_usBs3TestStep = __LINE__; Bs3MemCpy(&Ctx2, &Ctx, sizeof(Ctx2)); Ctx2.rsp.u = Bs3SelPtrToFlat(pbAltStack + 0x1980); if (Bs3TrapSetJmp(&TrapCtx)) Bs3RegCtxRestore(&Ctx2, 0); /* (does not return) */ bs3CpuBasic2_CompareIntCtx1(&TrapCtx, &Ctx2, 0x80 /*bXcpt*/); # if TMPL_BITS == 16 if ((pbTmp = (uint8_t *)ASMMemFirstNonZero(pbAltStack, cbAltStack)) != NULL) bs3CpuBasic2_FailedF("someone touched the alt stack (%p) with SS:ESP=%04x:%#RX32: %p=%02x\n", pbAltStack, Ctx2.ss, Ctx2.rsp.u32, pbTmp, *pbTmp); # else if (ASMMemIsZero(pbAltStack, cbAltStack)) bs3CpuBasic2_FailedF("alt stack wasn't used despite SS:ESP=%04x:%#RX32\n", Ctx2.ss, Ctx2.rsp.u32); # endif /* Different rings (load SS0:SP0 from TSS). */ bs3CpuBasic2_TssGateEsp_AltStackOuterRing(&Ctx, 1, pbAltStack, cbAltStack, g_f16BitSys, g_f16BitSys, g_f16BitSys, __LINE__); bs3CpuBasic2_TssGateEsp_AltStackOuterRing(&Ctx, 2, pbAltStack, cbAltStack, g_f16BitSys, g_f16BitSys, g_f16BitSys, __LINE__); bs3CpuBasic2_TssGateEsp_AltStackOuterRing(&Ctx, 3, pbAltStack, cbAltStack, g_f16BitSys, g_f16BitSys, g_f16BitSys, __LINE__); /* Different rings but switch the SS bitness in the TSS. */ if (g_f16BitSys) { Bs3Tss16.ss0 = BS3_SEL_R0_SS32; bs3CpuBasic2_TssGateEsp_AltStackOuterRing(&Ctx, 1, pbAltStack, cbAltStack, false, g_f16BitSys, g_f16BitSys, __LINE__); Bs3Tss16.ss0 = BS3_SEL_R0_SS16; } else { Bs3Tss32.ss0 = BS3_SEL_R0_SS16; bs3CpuBasic2_TssGateEsp_AltStackOuterRing(&Ctx, 1, pbAltStack, cbAltStack, true, g_f16BitSys, g_f16BitSys, __LINE__); Bs3Tss32.ss0 = BS3_SEL_R0_SS32; } Bs3MemFree(pbAltStack, cbAltStack); } else Bs3TestPrintf("%s: Skipping ESP check, alloc failed\n", g_pszTestMode); } else Bs3TestPrintf("%s: Skipping ESP check, CPU too old\n", g_pszTestMode); } # endif /* ARCH_BITS != 64 */ #endif /* BS3_INSTANTIATING_CMN */ /* * Mode specific code. * Mode specific code. * Mode specific code. */ #ifdef BS3_INSTANTIATING_MODE BS3_DECL_FAR(uint8_t) TMPL_NM(bs3CpuBasic2_TssGateEsp)(uint8_t bMode) { uint8_t bRet = 0; g_pszTestMode = TMPL_NM(g_szBs3ModeName); g_bTestMode = bMode; g_f16BitSys = BS3_MODE_IS_16BIT_SYS(TMPL_MODE); # if TMPL_MODE == BS3_MODE_PE16 \ || TMPL_MODE == BS3_MODE_PE16_32 \ || TMPL_MODE == BS3_MODE_PP16 \ || TMPL_MODE == BS3_MODE_PP16_32 \ || TMPL_MODE == BS3_MODE_PAE16 \ || TMPL_MODE == BS3_MODE_PAE16_32 \ || TMPL_MODE == BS3_MODE_PE32 bs3CpuBasic2_TssGateEspCommon(BS3_MODE_IS_16BIT_SYS(TMPL_MODE), (PX86DESC)MyBs3Idt, BS3_MODE_IS_64BIT_SYS(TMPL_MODE) ? 1 : 0); # else bRet = BS3TESTDOMODE_SKIPPED; # endif /* * Re-initialize the IDT. */ Bs3TrapInit(); return bRet; } BS3_DECL_FAR(uint8_t) TMPL_NM(bs3CpuBasic2_RaiseXcpt1)(uint8_t bMode) { g_pszTestMode = TMPL_NM(g_szBs3ModeName); g_bTestMode = bMode; g_f16BitSys = BS3_MODE_IS_16BIT_SYS(TMPL_MODE); # if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE) /* * Pass to common worker which is only compiled once per mode. */ bs3CpuBasic2_RaiseXcpt1Common(MY_SYS_SEL_R0_CS, MY_SYS_SEL_R0_CS_CNF, MY_SYS_SEL_R0_SS, (PX86DESC)MyBs3Idt, BS3_MODE_IS_64BIT_SYS(TMPL_MODE) ? 1 : 0); /* * Re-initialize the IDT. */ Bs3TrapInit(); return 0; # elif TMPL_MODE == BS3_MODE_RM /* * Check */ /** @todo check */ return BS3TESTDOMODE_SKIPPED; # else return BS3TESTDOMODE_SKIPPED; # endif } #endif /* BS3_INSTANTIATING_MODE */