| 1 | /* $Id: tstVMMR0CallHost-1.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Testcase for the VMMR0JMPBUF operations.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #include <iprt/errcore.h>
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| 33 | #include <VBox/param.h>
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| 34 | #include <iprt/alloca.h>
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| 35 | #include <iprt/initterm.h>
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| 36 | #include <iprt/rand.h>
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| 37 | #include <iprt/string.h>
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| 38 | #include <iprt/stream.h>
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| 39 | #include <iprt/test.h>
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| 40 |
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| 41 | #define IN_VMM_R0
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| 42 | #define IN_RING0 /* pretent we're in Ring-0 to get the prototypes. */
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| 43 | #include <VBox/vmm/vmm.h>
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| 44 | #include "VMMInternal.h"
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| 45 |
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| 46 |
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| 47 | /*********************************************************************************************************************************
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| 48 | * Global Variables *
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| 49 | *********************************************************************************************************************************/
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| 50 | /** The jump buffer. */
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| 51 | static VMMR0JMPBUF g_Jmp;
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| 52 | /** The mirror jump buffer. */
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| 53 | static VMMR0JMPBUF g_JmpMirror;
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| 54 | /** The number of jumps we've done. */
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| 55 | static unsigned volatile g_cJmps;
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| 56 | /** Number of bytes allocated last time we called foo(). */
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| 57 | static size_t volatile g_cbFoo;
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| 58 | /** Number of bytes used last time we called foo(). */
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| 59 | static intptr_t volatile g_cbFooUsed;
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| 60 | /** Set if we're in a long jump. */
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| 61 | static bool g_fInLongJmp;
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| 62 |
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| 63 |
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| 64 | int foo(int i, int iZero, int iMinusOne)
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| 65 | {
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| 66 | NOREF(iZero);
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| 67 |
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| 68 | /* allocate a buffer which we fill up to the end. */
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| 69 | size_t cb = (i % 1555) + 32;
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| 70 | g_cbFoo = cb;
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| 71 | char *pv = (char *)alloca(cb);
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| 72 | RTStrPrintf(pv, cb, "i=%d%*s\n", i, cb, "");
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| 73 | #if defined(RT_ARCH_AMD64)
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| 74 | g_cbFooUsed = (uintptr_t)g_Jmp.rsp - (uintptr_t)pv;
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| 75 | RTTESTI_CHECK_MSG_RET(g_cbFooUsed < VMM_STACK_SIZE - 128, ("%p - %p -> %#x; cb=%#x i=%d\n", g_Jmp.rsp, pv, g_cbFooUsed, cb, i), -15);
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| 76 | #elif defined(RT_ARCH_X86)
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| 77 | g_cbFooUsed = (uintptr_t)g_Jmp.esp - (uintptr_t)pv;
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| 78 | RTTESTI_CHECK_MSG_RET(g_cbFooUsed < (intptr_t)VMM_STACK_SIZE - 128, ("%p - %p -> %#x; cb=%#x i=%d\n", g_Jmp.esp, pv, g_cbFooUsed, cb, i), -15);
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| 79 | #endif
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| 80 |
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| 81 | /* Twice in a row, every 7th time. */
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| 82 | if ((i % 7) <= 1)
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| 83 | {
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| 84 | g_cJmps++;
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| 85 | g_fInLongJmp = true;
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| 86 | int rc = vmmR0CallRing3LongJmp(&g_Jmp, 42);
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| 87 | g_fInLongJmp = false;
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| 88 | if (!rc)
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| 89 | return i + 10000;
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| 90 | return -1;
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| 91 | }
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| 92 | NOREF(iMinusOne);
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| 93 | return i;
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| 94 | }
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| 95 |
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| 96 |
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| 97 | DECLCALLBACK(int) tst2(intptr_t i, intptr_t i2)
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| 98 | {
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| 99 | RTTESTI_CHECK_MSG_RET(i >= 0 && i <= 8192, ("i=%d is out of range [0..8192]\n", i), 1);
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| 100 | RTTESTI_CHECK_MSG_RET(i2 == 0, ("i2=%d is out of range [0]\n", i2), 1);
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| 101 | int iExpect = (i % 7) <= 1 ? i + 10000 : i;
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| 102 | int rc = foo(i, 0, -1);
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| 103 | RTTESTI_CHECK_MSG_RET(rc == iExpect, ("i=%d rc=%d expected=%d\n", i, rc, iExpect), 1);
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| 104 | return 0;
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| 105 | }
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| 106 |
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| 107 |
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| 108 | DECLCALLBACK(DECL_NO_INLINE(RT_NOTHING, int)) stackRandom(PVMMR0JMPBUF pJmpBuf, PFNVMMR0SETJMP pfn, PVM pVM, PVMCPU pVCpu)
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| 109 | {
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| 110 | #ifdef RT_ARCH_AMD64
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| 111 | uint32_t cbRand = RTRandU32Ex(1, 96);
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| 112 | #else
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| 113 | uint32_t cbRand = 1;
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| 114 | #endif
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| 115 | uint8_t volatile *pabFuzz = (uint8_t volatile *)alloca(cbRand);
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| 116 | memset((void *)pabFuzz, 0xfa, cbRand);
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| 117 | int rc = vmmR0CallRing3SetJmp(pJmpBuf, pfn, pVM, pVCpu);
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| 118 | memset((void *)pabFuzz, 0xaf, cbRand);
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| 119 | return rc;
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| 120 | }
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| 121 |
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| 122 |
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| 123 | void tst(int iFrom, int iTo, int iInc)
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| 124 | {
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| 125 | RT_BZERO(&g_Jmp, RT_UOFFSETOF(VMMR0JMPBUF, cbStackBuf));
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| 126 | g_Jmp.cbStackValid = _1M;
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| 127 | memset((void *)g_Jmp.pvStackBuf, '\0', g_Jmp.cbStackBuf);
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| 128 | g_cbFoo = 0;
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| 129 | g_cJmps = 0;
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| 130 | g_cbFooUsed = 0;
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| 131 | g_fInLongJmp = false;
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| 132 |
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| 133 | for (int i = iFrom, iItr = 0; i != iTo; i += iInc, iItr++)
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| 134 | {
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| 135 | g_fInLongJmp = false;
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| 136 | int rc = stackRandom(&g_Jmp, (PFNVMMR0SETJMP)(uintptr_t)tst2, (PVM)(uintptr_t)i, 0);
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| 137 | RTTESTI_CHECK_MSG_RETV(rc == (g_fInLongJmp ? 42 : 0),
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| 138 | ("i=%d rc=%d setjmp; cbFoo=%#x cbFooUsed=%#x fInLongJmp=%d\n",
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| 139 | i, rc, g_cbFoo, g_cbFooUsed, g_fInLongJmp));
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| 140 |
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| 141 | }
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| 142 | RTTESTI_CHECK_MSG_RETV(g_cJmps, ("No jumps!"));
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| 143 | }
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| 144 |
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| 145 |
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| 146 | int main()
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| 147 | {
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| 148 | /*
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| 149 | * Init.
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| 150 | */
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| 151 | RTTEST hTest;
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| 152 | RTEXITCODE rcExit = RTTestInitAndCreate("tstVMMR0CallHost-1", &hTest);
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| 153 | if (rcExit != RTEXITCODE_SUCCESS)
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| 154 | return rcExit;
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| 155 | RTTestBanner(hTest);
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| 156 |
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| 157 | g_Jmp.cbStackBuf = HOST_PAGE_SIZE;
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| 158 | g_Jmp.pvStackBuf = (uintptr_t)RTTestGuardedAllocTail(hTest, g_Jmp.cbStackBuf);
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| 159 | g_Jmp.pMirrorBuf = (uintptr_t)&g_JmpMirror;
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| 160 |
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| 161 | /*
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| 162 | * Run two test with about 1000 long jumps each.
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| 163 | */
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| 164 | RTTestSub(hTest, "Increasing stack usage");
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| 165 | tst(0, 7000, 1);
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| 166 | RTTestSub(hTest, "Decreasing stack usage");
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| 167 | tst(7599, 0, -1);
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| 168 |
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| 169 | return RTTestSummaryAndDestroy(hTest);
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| 170 | }
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