| 1 | /* $Id: tstVMMR0CallHost-1.cpp 82968 2020-02-04 10:35:17Z 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) 2006-2020 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 |
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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/errcore.h>
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| 23 | #include <VBox/param.h>
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| 24 | #include <iprt/alloca.h>
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| 25 | #include <iprt/initterm.h>
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| 26 | #include <iprt/rand.h>
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| 27 | #include <iprt/string.h>
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| 28 | #include <iprt/stream.h>
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| 29 | #include <iprt/test.h>
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| 30 |
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| 31 | #define IN_VMM_R0
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| 32 | #define IN_RING0 /* pretent we're in Ring-0 to get the prototypes. */
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| 33 | #include <VBox/vmm/vmm.h>
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| 34 | #include "VMMInternal.h"
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| 35 |
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| 36 |
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| 37 | /*********************************************************************************************************************************
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| 38 | * Defined Constants And Macros *
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| 39 | *********************************************************************************************************************************/
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| 40 | #if !defined(VMM_R0_SWITCH_STACK) && !defined(VMM_R0_NO_SWITCH_STACK)
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| 41 | # error "VMM_R0_SWITCH_STACK or VMM_R0_NO_SWITCH_STACK has to be defined."
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| 42 | #endif
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| 43 |
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| 44 |
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| 45 | /*********************************************************************************************************************************
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| 46 | * Global Variables *
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| 47 | *********************************************************************************************************************************/
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| 48 | /** The jump buffer. */
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| 49 | static VMMR0JMPBUF g_Jmp;
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| 50 | /** The number of jumps we've done. */
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| 51 | static unsigned volatile g_cJmps;
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| 52 | /** Number of bytes allocated last time we called foo(). */
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| 53 | static size_t volatile g_cbFoo;
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| 54 | /** Number of bytes used last time we called foo(). */
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| 55 | static intptr_t volatile g_cbFooUsed;
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| 56 |
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| 57 |
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| 58 | int foo(int i, int iZero, int iMinusOne)
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| 59 | {
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| 60 | NOREF(iZero);
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| 61 |
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| 62 | /* allocate a buffer which we fill up to the end. */
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| 63 | size_t cb = (i % 1555) + 32;
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| 64 | g_cbFoo = cb;
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| 65 | char *pv = (char *)alloca(cb);
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| 66 | RTStrPrintf(pv, cb, "i=%d%*s\n", i, cb, "");
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| 67 | #ifdef VMM_R0_SWITCH_STACK
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| 68 | g_cbFooUsed = VMM_STACK_SIZE - ((uintptr_t)pv - (uintptr_t)g_Jmp.pvSavedStack);
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| 69 | RTTESTI_CHECK_MSG_RET(g_cbFooUsed < (intptr_t)VMM_STACK_SIZE - 128, ("%#x - (%p - %p) -> %#x; cb=%#x i=%d\n", VMM_STACK_SIZE, pv, g_Jmp.pvSavedStack, g_cbFooUsed, cb, i), -15);
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| 70 | #elif defined(RT_ARCH_AMD64)
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| 71 | g_cbFooUsed = (uintptr_t)g_Jmp.rsp - (uintptr_t)pv;
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| 72 | 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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| 73 | #elif defined(RT_ARCH_X86)
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| 74 | g_cbFooUsed = (uintptr_t)g_Jmp.esp - (uintptr_t)pv;
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| 75 | 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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| 76 | #endif
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| 77 |
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| 78 | /* Twice in a row, every 7th time. */
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| 79 | if ((i % 7) <= 1)
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| 80 | {
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| 81 | g_cJmps++;
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| 82 | int rc = vmmR0CallRing3LongJmp(&g_Jmp, 42);
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| 83 | if (!rc)
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| 84 | return i + 10000;
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| 85 | return -1;
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| 86 | }
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| 87 | NOREF(iMinusOne);
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| 88 | return i;
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| 89 | }
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| 90 |
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| 91 |
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| 92 | DECLCALLBACK(int) tst2(intptr_t i, intptr_t i2)
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| 93 | {
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| 94 | RTTESTI_CHECK_MSG_RET(i >= 0 && i <= 8192, ("i=%d is out of range [0..8192]\n", i), 1);
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| 95 | RTTESTI_CHECK_MSG_RET(i2 == 0, ("i2=%d is out of range [0]\n", i2), 1);
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| 96 | int iExpect = (i % 7) <= 1 ? i + 10000 : i;
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| 97 | int rc = foo(i, 0, -1);
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| 98 | RTTESTI_CHECK_MSG_RET(rc == iExpect, ("i=%d rc=%d expected=%d\n", i, rc, iExpect), 1);
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| 99 | return 0;
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| 100 | }
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| 101 |
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| 102 |
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| 103 | DECLCALLBACK(DECL_NO_INLINE(RT_NOTHING, int)) stackRandom(PVMMR0JMPBUF pJmpBuf, PFNVMMR0SETJMP pfn, PVM pVM, PVMCPU pVCpu)
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| 104 | {
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| 105 | #ifdef RT_ARCH_AMD64
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| 106 | uint32_t cbRand = RTRandU32Ex(1, 96);
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| 107 | #else
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| 108 | uint32_t cbRand = 1;
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| 109 | #endif
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| 110 | uint8_t volatile *pabFuzz = (uint8_t volatile *)alloca(cbRand);
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| 111 | memset((void *)pabFuzz, 0xfa, cbRand);
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| 112 | int rc = vmmR0CallRing3SetJmp(pJmpBuf, pfn, pVM, pVCpu);
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| 113 | memset((void *)pabFuzz, 0xaf, cbRand);
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| 114 | return rc;
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| 115 | }
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| 116 |
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| 117 |
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| 118 | void tst(int iFrom, int iTo, int iInc)
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| 119 | {
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| 120 | #ifdef VMM_R0_SWITCH_STACK
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| 121 | int const cIterations = iFrom > iTo ? iFrom - iTo : iTo - iFrom;
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| 122 | void *pvPrev = alloca(1);
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| 123 | #endif
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| 124 |
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| 125 | RTR0PTR R0PtrSaved = g_Jmp.pvSavedStack;
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| 126 | RT_ZERO(g_Jmp);
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| 127 | g_Jmp.pvSavedStack = R0PtrSaved;
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| 128 | memset((void *)g_Jmp.pvSavedStack, '\0', VMM_STACK_SIZE);
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| 129 | g_cbFoo = 0;
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| 130 | g_cJmps = 0;
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| 131 | g_cbFooUsed = 0;
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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 | int rc = stackRandom(&g_Jmp, (PFNVMMR0SETJMP)(uintptr_t)tst2, (PVM)(uintptr_t)i, 0);
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| 136 | RTTESTI_CHECK_MSG_RETV(rc == 0 || rc == 42, ("i=%d rc=%d setjmp; cbFoo=%#x cbFooUsed=%#x\n", i, rc, g_cbFoo, g_cbFooUsed));
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| 137 |
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| 138 | #ifdef VMM_R0_SWITCH_STACK
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| 139 | /* Make the stack pointer slide for the second half of the calls. */
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| 140 | if (iItr >= cIterations / 2)
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| 141 | {
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| 142 | /* Note! gcc does funny rounding up of alloca(). */
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| 143 | void *pv2 = alloca((i % 63) | 1);
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| 144 | size_t cb2 = (uintptr_t)pvPrev - (uintptr_t)pv2;
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| 145 | RTTESTI_CHECK_MSG(cb2 >= 16 && cb2 <= 128, ("cb2=%zu pv2=%p pvPrev=%p iAlloca=%d\n", cb2, pv2, pvPrev, iItr));
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| 146 | memset(pv2, 0xff, cb2);
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| 147 | memset(pvPrev, 0xee, 1);
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| 148 | pvPrev = pv2;
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| 149 | }
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| 150 | #endif
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| 151 | }
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| 152 | RTTESTI_CHECK_MSG_RETV(g_cJmps, ("No jumps!"));
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| 153 | if (g_Jmp.cbUsedAvg || g_Jmp.cUsedTotal)
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| 154 | RTTestIPrintf(RTTESTLVL_ALWAYS, "cbUsedAvg=%#x cbUsedMax=%#x cUsedTotal=%#llx\n",
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| 155 | g_Jmp.cbUsedAvg, g_Jmp.cbUsedMax, g_Jmp.cUsedTotal);
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| 156 | }
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| 157 |
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| 158 |
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| 159 | int main()
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| 160 | {
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| 161 | /*
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| 162 | * Init.
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| 163 | */
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| 164 | RTTEST hTest;
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| 165 | RTEXITCODE rcExit = RTTestInitAndCreate("tstVMMR0CallHost-1", &hTest);
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| 166 | if (rcExit != RTEXITCODE_SUCCESS)
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| 167 | return rcExit;
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| 168 | RTTestBanner(hTest);
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| 169 |
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| 170 | g_Jmp.pvSavedStack = (RTR0PTR)RTTestGuardedAllocTail(hTest, VMM_STACK_SIZE);
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| 171 |
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| 172 | /*
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| 173 | * Run two test with about 1000 long jumps each.
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| 174 | */
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| 175 | RTTestSub(hTest, "Increasing stack usage");
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| 176 | tst(0, 7000, 1);
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| 177 | RTTestSub(hTest, "Decreasing stack usage");
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| 178 | tst(7599, 0, -1);
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| 179 |
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| 180 | return RTTestSummaryAndDestroy(hTest);
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| 181 | }
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