/* $Id: tstLdr-3.cpp 63063 2016-08-05 21:14:33Z vboxsync $ */ /** @file * IPRT - Testcase for parts of RTLdr*, manual inspection. */ /* * Copyright (C) 2006-2016 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 #include #include #include #include #include #include /********************************************************************************************************************************* * Global Variables * *********************************************************************************************************************************/ static RTUINTPTR g_uLoadAddr; static RTLDRMOD g_hLdrMod; static void *g_pvBits; static uint8_t g_cBits; /** * Current nearest symbol. */ typedef struct TESTNEARSYM { RTUINTPTR Addr; struct TESTSYM { RTUINTPTR Value; unsigned uSymbol; char szName[512]; } aSyms[2]; } TESTNEARSYM, *PTESTNEARSYM; /** * Enumeration callback function used by RTLdrEnumSymbols(). * * @returns iprt status code. Failure will stop the enumeration. * @param hLdrMod The loader module handle. * @param pszSymbol Symbol name. NULL if ordinal only. * @param uSymbol Symbol ordinal, ~0 if not used. * @param Value Symbol value. * @param pvUser The user argument specified to RTLdrEnumSymbols(). */ static DECLCALLBACK(int) testEnumSymbol2(RTLDRMOD hLdrMod, const char *pszSymbol, unsigned uSymbol, RTUINTPTR Value, void *pvUser) { RT_NOREF1(hLdrMod); PTESTNEARSYM pSym = (PTESTNEARSYM)pvUser; /* less or equal */ if ( Value <= pSym->Addr && ( Value > pSym->aSyms[0].Value || ( Value == pSym->aSyms[0].Value && !pSym->aSyms[0].szName[0] && pszSymbol && *pszSymbol ) ) ) { pSym->aSyms[0].Value = Value; pSym->aSyms[0].uSymbol = uSymbol; pSym->aSyms[0].szName[0] = '\0'; if (pszSymbol) strncat(pSym->aSyms[0].szName, pszSymbol, sizeof(pSym->aSyms[0].szName)-1); } /* above */ if ( Value > pSym->Addr && ( Value < pSym->aSyms[1].Value || ( Value == pSym->aSyms[1].Value && !pSym->aSyms[1].szName[1] && pszSymbol && *pszSymbol ) ) ) { pSym->aSyms[1].Value = Value; pSym->aSyms[1].uSymbol = uSymbol; pSym->aSyms[1].szName[0] = '\0'; if (pszSymbol) strncat(pSym->aSyms[1].szName, pszSymbol, sizeof(pSym->aSyms[1].szName)-1); } return VINF_SUCCESS; } static int FindNearSymbol(RTUINTPTR uAddr, PTESTNEARSYM pNearSym) { RT_ZERO(*pNearSym); pNearSym->Addr = (RTUINTPTR)uAddr; pNearSym->aSyms[1].Value = ~(RTUINTPTR)0; int rc = RTLdrEnumSymbols(g_hLdrMod, RTLDR_ENUM_SYMBOL_FLAGS_ALL, g_pvBits, g_uLoadAddr, testEnumSymbol2, pNearSym); if (RT_FAILURE(rc)) RTPrintf("tstLdr-3: Failed to enumerate symbols: %Rra\n", rc); return rc; } static DECLCALLBACK(int) MyGetSymbol(PCDISCPUSTATE pCpu, uint32_t u32Sel, RTUINTPTR uAddress, char *pszBuf, size_t cchBuf, RTINTPTR *poff, void *pvUser) { RT_NOREF3(pCpu, u32Sel, pvUser); if ( uAddress > RTLdrSize(g_hLdrMod) + g_uLoadAddr || uAddress < g_uLoadAddr) return VERR_SYMBOL_NOT_FOUND; TESTNEARSYM NearSym; int rc = FindNearSymbol(uAddress, &NearSym); if (RT_FAILURE(rc)) return rc; RTStrCopy(pszBuf, cchBuf, NearSym.aSyms[0].szName); *poff = uAddress - NearSym.aSyms[0].Value; return VINF_SUCCESS; } /** * @callback_method_impl{FNDISREADBYTES} */ static DECLCALLBACK(int) MyReadBytes(PDISCPUSTATE pDis, uint8_t offInstr, uint8_t cbMinRead, uint8_t cbMaxRead) { RT_NOREF1(cbMaxRead); uint8_t const *pbSrc = (uint8_t const *)((uintptr_t)pDis->uInstrAddr + (uintptr_t)pDis->pvUser + offInstr); memcpy(&pDis->abInstr[offInstr], pbSrc, cbMinRead); pDis->cbCachedInstr = offInstr + cbMinRead; return VINF_SUCCESS; } static bool MyDisBlock(DISCPUMODE enmCpuMode, RTHCUINTPTR pvCodeBlock, int32_t cbMax, RTUINTPTR off, RTUINTPTR uNearAddr, RTUINTPTR uSearchAddr) { DISCPUSTATE Cpu; int32_t i = 0; while (i < cbMax) { bool fQuiet = RTAssertSetQuiet(true); bool fMayPanic = RTAssertSetMayPanic(false); char szOutput[256]; unsigned cbInstr; int rc = DISInstrWithReader(uNearAddr + i, enmCpuMode, MyReadBytes, (uint8_t *)pvCodeBlock - (uintptr_t)uNearAddr, &Cpu, &cbInstr); RTAssertSetMayPanic(fMayPanic); RTAssertSetQuiet(fQuiet); if (RT_FAILURE(rc)) return false; TESTNEARSYM NearSym; rc = FindNearSymbol(uNearAddr + i, &NearSym); if (RT_SUCCESS(rc) && NearSym.aSyms[0].Value == NearSym.Addr) RTPrintf("%s:\n", NearSym.aSyms[0].szName); DISFormatYasmEx(&Cpu, szOutput, sizeof(szOutput), DIS_FMT_FLAGS_RELATIVE_BRANCH | DIS_FMT_FLAGS_BYTES_RIGHT | DIS_FMT_FLAGS_ADDR_LEFT | DIS_FMT_FLAGS_BYTES_SPACED, MyGetSymbol, NULL); RTPrintf("%s\n", szOutput); if (pvCodeBlock + i + off == uSearchAddr) RTPrintf("^^^^^^^^\n"); /* next */ i += cbInstr; } return true; } /** * Resolve an external symbol during RTLdrGetBits(). * * @returns iprt status code. * @param hLdrMod The loader module handle. * @param pszModule Module name. * @param pszSymbol Symbol name, NULL if uSymbol should be used. * @param uSymbol Symbol ordinal, ~0 if pszSymbol should be used. * @param pValue Where to store the symbol value (address). * @param pvUser User argument. */ static DECLCALLBACK(int) testGetImport(RTLDRMOD hLdrMod, const char *pszModule, const char *pszSymbol, unsigned uSymbol, RTUINTPTR *pValue, void *pvUser) { RT_NOREF5(hLdrMod, pszModule, pszSymbol, uSymbol, pvUser); #if 1 RTUINTPTR BaseAddr = *(PCRTUINTPTR)pvUser; *pValue = BaseAddr + UINT32_C(0x604020f0); #else *pValue = UINT64_C(0xffffff7f820df000); #endif if (g_cBits == 32) *pValue &= UINT32_MAX; return VINF_SUCCESS; } /** * Enumeration callback function used by RTLdrEnumSymbols(). * * @returns iprt status code. Failure will stop the enumeration. * @param hLdrMod The loader module handle. * @param pszSymbol Symbol name. NULL if ordinal only. * @param uSymbol Symbol ordinal, ~0 if not used. * @param Value Symbol value. * @param pvUser The user argument specified to RTLdrEnumSymbols(). */ static DECLCALLBACK(int) testEnumSymbol1(RTLDRMOD hLdrMod, const char *pszSymbol, unsigned uSymbol, RTUINTPTR Value, void *pvUser) { RT_NOREF2(hLdrMod, pvUser); RTPrintf(" %RTptr %s (%d)\n", Value, pszSymbol, uSymbol); return VINF_SUCCESS; } static int testDisasNear(uint64_t uAddr) { TESTNEARSYM NearSym; int rc = FindNearSymbol(uAddr, &NearSym); if (RT_FAILURE(rc)) return rc; RTPrintf("tstLdr-3: Addr=%RTptr\n" "%RTptr %s (%d) - %RTptr %s (%d)\n", NearSym.Addr, NearSym.aSyms[0].Value, NearSym.aSyms[0].szName, NearSym.aSyms[0].uSymbol, NearSym.aSyms[1].Value, NearSym.aSyms[1].szName, NearSym.aSyms[1].uSymbol); if (NearSym.Addr - NearSym.aSyms[0].Value < 0x10000) { DISCPUMODE enmDisCpuMode = g_cBits == 32 ? DISCPUMODE_32BIT : DISCPUMODE_64BIT; uint8_t *pbCode = (uint8_t *)g_pvBits + (NearSym.aSyms[0].Value - g_uLoadAddr); MyDisBlock(enmDisCpuMode, (uintptr_t)pbCode, RT_MAX(NearSym.aSyms[1].Value - NearSym.aSyms[0].Value, 0x20000), NearSym.aSyms[0].Value - (uintptr_t)pbCode, NearSym.aSyms[0].Value, NearSym.Addr); } return VINF_SUCCESS; } int main(int argc, char **argv) { RTR3InitExe(argc, &argv, 0); int rcRet = 0; if (argc <= 2) { RTPrintf("usage: %s [addr1 []]\n", argv[0]); return 1; } /* * Module & code bitness (optional). */ g_cBits = ARCH_BITS; if (!strcmp(argv[1], "--32")) { g_cBits = 32; argc--; argv++; } else if (!strcmp(argv[1], "--64")) { g_cBits = 64; argc--; argv++; } /* * Load the module. */ g_uLoadAddr = (RTUINTPTR)RTStrToUInt64(argv[1]); int rc = RTLdrOpen(argv[2], 0, RTLDRARCH_WHATEVER, &g_hLdrMod); if (RT_FAILURE(rc)) { RTPrintf("tstLdr-3: Failed to open '%s': %Rra\n", argv[2], rc); return 1; } g_pvBits = RTMemAlloc(RTLdrSize(g_hLdrMod)); rc = RTLdrGetBits(g_hLdrMod, g_pvBits, g_uLoadAddr, testGetImport, &g_uLoadAddr); if (RT_SUCCESS(rc)) { if ( argc == 4 && argv[3][0] == '*') { /* * Wildcard address mode. */ uint64_t uWild = RTStrToUInt64(&argv[3][1]); uint64_t uIncrements = strchr(argv[3], '/') ? RTStrToUInt64(strchr(argv[3], '/') + 1) : 0x1000; if (!uIncrements) uIncrements = 0x1000; uint64_t uMax = RTLdrSize(g_hLdrMod) + g_uLoadAddr; for (uint64_t uCur = g_uLoadAddr + uWild; uCur < uMax; uCur += uIncrements) testDisasNear(uCur); } else if (argc > 3) { /* * User specified addresses within the module. */ for (int i = 3; i < argc; i++) { rc = testDisasNear(RTStrToUInt64(argv[i])); if (RT_FAILURE(rc)) rcRet++; } } else { /* * Enumerate symbols. */ rc = RTLdrEnumSymbols(g_hLdrMod, RTLDR_ENUM_SYMBOL_FLAGS_ALL, g_pvBits, g_uLoadAddr, testEnumSymbol1, NULL); if (RT_FAILURE(rc)) { RTPrintf("tstLdr-3: Failed to enumerate symbols: %Rra\n", rc); rcRet++; } } } else { RTPrintf("tstLdr-3: Failed to get bits for '%s' at %RTptr: %Rra\n", argv[2], g_uLoadAddr, rc); rcRet++; } RTMemFree(g_pvBits); RTLdrClose(g_hLdrMod); /* * Test result summary. */ if (!rcRet) RTPrintf("tstLdr-3: SUCCESS\n"); else RTPrintf("tstLdr-3: FAILURE - %d errors\n", rcRet); return !!rcRet; }