| /* |
| * Copyright (c) 2007 The Hewlett-Packard Development Company |
| * All rights reserved. |
| * |
| * The license below extends only to copyright in the software and shall |
| * not be construed as granting a license to any other intellectual |
| * property including but not limited to intellectual property relating |
| * to a hardware implementation of the functionality of the software |
| * licensed hereunder. You may use the software subject to the license |
| * terms below provided that you ensure that this notice is replicated |
| * unmodified and in its entirety in all distributions of the software, |
| * modified or unmodified, in source code or in binary form. |
| * |
| * Copyright (c) 2003-2006 The Regents of The University of Michigan |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer; |
| * redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution; |
| * neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * Authors: Gabe Black |
| * Ali Saidi |
| */ |
| |
| #include "arch/x86/regs/misc.hh" |
| #include "arch/x86/regs/segment.hh" |
| #include "arch/x86/isa_traits.hh" |
| #include "arch/x86/process.hh" |
| #include "arch/x86/types.hh" |
| #include "base/loader/elf_object.hh" |
| #include "base/loader/object_file.hh" |
| #include "base/misc.hh" |
| #include "base/trace.hh" |
| #include "cpu/thread_context.hh" |
| #include "debug/Stack.hh" |
| #include "mem/page_table.hh" |
| #include "sim/process_impl.hh" |
| #include "sim/syscall_emul.hh" |
| #include "sim/system.hh" |
| |
| using namespace std; |
| using namespace X86ISA; |
| |
| static const int ArgumentReg[] = { |
| INTREG_RDI, |
| INTREG_RSI, |
| INTREG_RDX, |
| //This argument register is r10 for syscalls and rcx for C. |
| INTREG_R10W, |
| //INTREG_RCX, |
| INTREG_R8W, |
| INTREG_R9W |
| }; |
| static const int NumArgumentRegs = sizeof(ArgumentReg) / sizeof(const int); |
| static const int ArgumentReg32[] = { |
| INTREG_EBX, |
| INTREG_ECX, |
| INTREG_EDX, |
| INTREG_ESI, |
| INTREG_EDI, |
| }; |
| static const int NumArgumentRegs32 = sizeof(ArgumentReg) / sizeof(const int); |
| |
| X86LiveProcess::X86LiveProcess(LiveProcessParams * params, ObjectFile *objFile, |
| SyscallDesc *_syscallDescs, int _numSyscallDescs) : |
| LiveProcess(params, objFile), syscallDescs(_syscallDescs), |
| numSyscallDescs(_numSyscallDescs) |
| { |
| brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); |
| brk_point = roundUp(brk_point, VMPageSize); |
| } |
| |
| X86_64LiveProcess::X86_64LiveProcess(LiveProcessParams *params, |
| ObjectFile *objFile, SyscallDesc *_syscallDescs, |
| int _numSyscallDescs) : |
| X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) |
| { |
| |
| vsyscallPage.base = 0xffffffffff600000ULL; |
| vsyscallPage.size = VMPageSize; |
| vsyscallPage.vtimeOffset = 0x400; |
| vsyscallPage.vgettimeofdayOffset = 0x0; |
| |
| // Set up stack. On X86_64 Linux, stack goes from the top of memory |
| // downward, less the hole for the kernel address space plus one page |
| // for undertermined purposes. |
| stack_base = (Addr)0x7FFFFFFFF000ULL; |
| |
| // Set pointer for next thread stack. Reserve 8M for main stack. |
| next_thread_stack_base = stack_base - (8 * 1024 * 1024); |
| |
| // Set up region for mmaps. This was determined empirically and may not |
| // always be correct. |
| mmap_start = mmap_end = (Addr)0x2aaaaaaab000ULL; |
| } |
| |
| void |
| I386LiveProcess::syscall(int64_t callnum, ThreadContext *tc) |
| { |
| TheISA::PCState pc = tc->pcState(); |
| Addr eip = pc.pc(); |
| if (eip >= vsyscallPage.base && |
| eip < vsyscallPage.base + vsyscallPage.size) { |
| pc.npc(vsyscallPage.base + vsyscallPage.vsysexitOffset); |
| tc->pcState(pc); |
| } |
| X86LiveProcess::syscall(callnum, tc); |
| } |
| |
| |
| I386LiveProcess::I386LiveProcess(LiveProcessParams *params, |
| ObjectFile *objFile, SyscallDesc *_syscallDescs, |
| int _numSyscallDescs) : |
| X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) |
| { |
| _gdtStart = ULL(0xffffd000); |
| _gdtSize = VMPageSize; |
| |
| vsyscallPage.base = 0xffffe000ULL; |
| vsyscallPage.size = VMPageSize; |
| vsyscallPage.vsyscallOffset = 0x400; |
| vsyscallPage.vsysexitOffset = 0x410; |
| |
| stack_base = _gdtStart; |
| |
| // Set pointer for next thread stack. Reserve 8M for main stack. |
| next_thread_stack_base = stack_base - (8 * 1024 * 1024); |
| |
| // Set up region for mmaps. This was determined empirically and may not |
| // always be correct. |
| mmap_start = mmap_end = (Addr)0xf7ffe000ULL; |
| } |
| |
| SyscallDesc* |
| X86LiveProcess::getDesc(int callnum) |
| { |
| if (callnum < 0 || callnum >= numSyscallDescs) |
| return NULL; |
| return &syscallDescs[callnum]; |
| } |
| |
| void |
| X86_64LiveProcess::initState() |
| { |
| X86LiveProcess::initState(); |
| |
| argsInit(sizeof(uint64_t), VMPageSize); |
| |
| // Set up the vsyscall page for this process. |
| allocateMem(vsyscallPage.base, vsyscallPage.size); |
| uint8_t vtimeBlob[] = { |
| 0x48,0xc7,0xc0,0xc9,0x00,0x00,0x00, // mov $0xc9,%rax |
| 0x0f,0x05, // syscall |
| 0xc3 // retq |
| }; |
| initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vtimeOffset, |
| vtimeBlob, sizeof(vtimeBlob)); |
| |
| uint8_t vgettimeofdayBlob[] = { |
| 0x48,0xc7,0xc0,0x60,0x00,0x00,0x00, // mov $0x60,%rax |
| 0x0f,0x05, // syscall |
| 0xc3 // retq |
| }; |
| initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vgettimeofdayOffset, |
| vgettimeofdayBlob, sizeof(vgettimeofdayBlob)); |
| |
| for (int i = 0; i < contextIds.size(); i++) { |
| ThreadContext * tc = system->getThreadContext(contextIds[i]); |
| |
| SegAttr dataAttr = 0; |
| dataAttr.dpl = 3; |
| dataAttr.unusable = 0; |
| dataAttr.defaultSize = 1; |
| dataAttr.longMode = 1; |
| dataAttr.avl = 0; |
| dataAttr.granularity = 1; |
| dataAttr.present = 1; |
| dataAttr.type = 3; |
| dataAttr.writable = 1; |
| dataAttr.readable = 1; |
| dataAttr.expandDown = 0; |
| dataAttr.system = 1; |
| |
| //Initialize the segment registers. |
| for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { |
| tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); |
| tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); |
| tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); |
| } |
| |
| SegAttr csAttr = 0; |
| csAttr.dpl = 3; |
| csAttr.unusable = 0; |
| csAttr.defaultSize = 0; |
| csAttr.longMode = 1; |
| csAttr.avl = 0; |
| csAttr.granularity = 1; |
| csAttr.present = 1; |
| csAttr.type = 10; |
| csAttr.writable = 0; |
| csAttr.readable = 1; |
| csAttr.expandDown = 0; |
| csAttr.system = 1; |
| |
| tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); |
| |
| Efer efer = 0; |
| efer.sce = 1; // Enable system call extensions. |
| efer.lme = 1; // Enable long mode. |
| efer.lma = 1; // Activate long mode. |
| efer.nxe = 1; // Enable nx support. |
| efer.svme = 0; // Disable svm support for now. It isn't implemented. |
| efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. |
| tc->setMiscReg(MISCREG_EFER, efer); |
| |
| //Set up the registers that describe the operating mode. |
| CR0 cr0 = 0; |
| cr0.pg = 1; // Turn on paging. |
| cr0.cd = 0; // Don't disable caching. |
| cr0.nw = 0; // This is bit is defined to be ignored. |
| cr0.am = 0; // No alignment checking |
| cr0.wp = 0; // Supervisor mode can write read only pages |
| cr0.ne = 1; |
| cr0.et = 1; // This should always be 1 |
| cr0.ts = 0; // We don't do task switching, so causing fp exceptions |
| // would be pointless. |
| cr0.em = 0; // Allow x87 instructions to execute natively. |
| cr0.mp = 1; // This doesn't really matter, but the manual suggests |
| // setting it to one. |
| cr0.pe = 1; // We're definitely in protected mode. |
| tc->setMiscReg(MISCREG_CR0, cr0); |
| |
| tc->setMiscReg(MISCREG_MXCSR, 0x1f80); |
| } |
| } |
| |
| void |
| I386LiveProcess::initState() |
| { |
| X86LiveProcess::initState(); |
| |
| argsInit(sizeof(uint32_t), VMPageSize); |
| |
| /* |
| * Set up a GDT for this process. The whole GDT wouldn't really be for |
| * this process, but the only parts we care about are. |
| */ |
| allocateMem(_gdtStart, _gdtSize); |
| uint64_t zero = 0; |
| assert(_gdtSize % sizeof(zero) == 0); |
| for (Addr gdtCurrent = _gdtStart; |
| gdtCurrent < _gdtStart + _gdtSize; gdtCurrent += sizeof(zero)) { |
| initVirtMem.write(gdtCurrent, zero); |
| } |
| |
| // Set up the vsyscall page for this process. |
| allocateMem(vsyscallPage.base, vsyscallPage.size); |
| uint8_t vsyscallBlob[] = { |
| 0x51, // push %ecx |
| 0x52, // push %edp |
| 0x55, // push %ebp |
| 0x89, 0xe5, // mov %esp, %ebp |
| 0x0f, 0x34 // sysenter |
| }; |
| initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vsyscallOffset, |
| vsyscallBlob, sizeof(vsyscallBlob)); |
| |
| uint8_t vsysexitBlob[] = { |
| 0x5d, // pop %ebp |
| 0x5a, // pop %edx |
| 0x59, // pop %ecx |
| 0xc3 // ret |
| }; |
| initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vsysexitOffset, |
| vsysexitBlob, sizeof(vsysexitBlob)); |
| |
| for (int i = 0; i < contextIds.size(); i++) { |
| ThreadContext * tc = system->getThreadContext(contextIds[i]); |
| |
| SegAttr dataAttr = 0; |
| dataAttr.dpl = 3; |
| dataAttr.unusable = 0; |
| dataAttr.defaultSize = 1; |
| dataAttr.longMode = 0; |
| dataAttr.avl = 0; |
| dataAttr.granularity = 1; |
| dataAttr.present = 1; |
| dataAttr.type = 3; |
| dataAttr.writable = 1; |
| dataAttr.readable = 1; |
| dataAttr.expandDown = 0; |
| dataAttr.system = 1; |
| |
| //Initialize the segment registers. |
| for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { |
| tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); |
| tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); |
| tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); |
| tc->setMiscRegNoEffect(MISCREG_SEG_SEL(seg), 0xB); |
| tc->setMiscRegNoEffect(MISCREG_SEG_LIMIT(seg), (uint32_t)(-1)); |
| } |
| |
| SegAttr csAttr = 0; |
| csAttr.dpl = 3; |
| csAttr.unusable = 0; |
| csAttr.defaultSize = 1; |
| csAttr.longMode = 0; |
| csAttr.avl = 0; |
| csAttr.granularity = 1; |
| csAttr.present = 1; |
| csAttr.type = 0xa; |
| csAttr.writable = 0; |
| csAttr.readable = 1; |
| csAttr.expandDown = 0; |
| csAttr.system = 1; |
| |
| tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); |
| |
| tc->setMiscRegNoEffect(MISCREG_TSG_BASE, _gdtStart); |
| tc->setMiscRegNoEffect(MISCREG_TSG_EFF_BASE, _gdtStart); |
| tc->setMiscRegNoEffect(MISCREG_TSG_LIMIT, _gdtStart + _gdtSize - 1); |
| |
| // Set the LDT selector to 0 to deactivate it. |
| tc->setMiscRegNoEffect(MISCREG_TSL, 0); |
| |
| Efer efer = 0; |
| efer.sce = 1; // Enable system call extensions. |
| efer.lme = 1; // Enable long mode. |
| efer.lma = 0; // Deactivate long mode. |
| efer.nxe = 1; // Enable nx support. |
| efer.svme = 0; // Disable svm support for now. It isn't implemented. |
| efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. |
| tc->setMiscReg(MISCREG_EFER, efer); |
| |
| //Set up the registers that describe the operating mode. |
| CR0 cr0 = 0; |
| cr0.pg = 1; // Turn on paging. |
| cr0.cd = 0; // Don't disable caching. |
| cr0.nw = 0; // This is bit is defined to be ignored. |
| cr0.am = 0; // No alignment checking |
| cr0.wp = 0; // Supervisor mode can write read only pages |
| cr0.ne = 1; |
| cr0.et = 1; // This should always be 1 |
| cr0.ts = 0; // We don't do task switching, so causing fp exceptions |
| // would be pointless. |
| cr0.em = 0; // Allow x87 instructions to execute natively. |
| cr0.mp = 1; // This doesn't really matter, but the manual suggests |
| // setting it to one. |
| cr0.pe = 1; // We're definitely in protected mode. |
| tc->setMiscReg(MISCREG_CR0, cr0); |
| |
| tc->setMiscReg(MISCREG_MXCSR, 0x1f80); |
| } |
| } |
| |
| template<class IntType> |
| void |
| X86LiveProcess::argsInit(int pageSize, |
| std::vector<AuxVector<IntType> > extraAuxvs) |
| { |
| int intSize = sizeof(IntType); |
| |
| typedef AuxVector<IntType> auxv_t; |
| std::vector<auxv_t> auxv = extraAuxvs; |
| |
| string filename; |
| if(argv.size() < 1) |
| filename = ""; |
| else |
| filename = argv[0]; |
| |
| //We want 16 byte alignment |
| uint64_t align = 16; |
| |
| // load object file into target memory |
| objFile->loadSections(initVirtMem); |
| |
| enum X86CpuFeature { |
| X86_OnboardFPU = 1 << 0, |
| X86_VirtualModeExtensions = 1 << 1, |
| X86_DebuggingExtensions = 1 << 2, |
| X86_PageSizeExtensions = 1 << 3, |
| |
| X86_TimeStampCounter = 1 << 4, |
| X86_ModelSpecificRegisters = 1 << 5, |
| X86_PhysicalAddressExtensions = 1 << 6, |
| X86_MachineCheckExtensions = 1 << 7, |
| |
| X86_CMPXCHG8Instruction = 1 << 8, |
| X86_OnboardAPIC = 1 << 9, |
| X86_SYSENTER_SYSEXIT = 1 << 11, |
| |
| X86_MemoryTypeRangeRegisters = 1 << 12, |
| X86_PageGlobalEnable = 1 << 13, |
| X86_MachineCheckArchitecture = 1 << 14, |
| X86_CMOVInstruction = 1 << 15, |
| |
| X86_PageAttributeTable = 1 << 16, |
| X86_36BitPSEs = 1 << 17, |
| X86_ProcessorSerialNumber = 1 << 18, |
| X86_CLFLUSHInstruction = 1 << 19, |
| |
| X86_DebugTraceStore = 1 << 21, |
| X86_ACPIViaMSR = 1 << 22, |
| X86_MultimediaExtensions = 1 << 23, |
| |
| X86_FXSAVE_FXRSTOR = 1 << 24, |
| X86_StreamingSIMDExtensions = 1 << 25, |
| X86_StreamingSIMDExtensions2 = 1 << 26, |
| X86_CPUSelfSnoop = 1 << 27, |
| |
| X86_HyperThreading = 1 << 28, |
| X86_AutomaticClockControl = 1 << 29, |
| X86_IA64Processor = 1 << 30 |
| }; |
| |
| //Setup the auxilliary vectors. These will already have endian conversion. |
| //Auxilliary vectors are loaded only for elf formatted executables. |
| ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); |
| if(elfObject) |
| { |
| uint64_t features = |
| X86_OnboardFPU | |
| X86_VirtualModeExtensions | |
| X86_DebuggingExtensions | |
| X86_PageSizeExtensions | |
| X86_TimeStampCounter | |
| X86_ModelSpecificRegisters | |
| X86_PhysicalAddressExtensions | |
| X86_MachineCheckExtensions | |
| X86_CMPXCHG8Instruction | |
| X86_OnboardAPIC | |
| X86_SYSENTER_SYSEXIT | |
| X86_MemoryTypeRangeRegisters | |
| X86_PageGlobalEnable | |
| X86_MachineCheckArchitecture | |
| X86_CMOVInstruction | |
| X86_PageAttributeTable | |
| X86_36BitPSEs | |
| // X86_ProcessorSerialNumber | |
| X86_CLFLUSHInstruction | |
| // X86_DebugTraceStore | |
| // X86_ACPIViaMSR | |
| X86_MultimediaExtensions | |
| X86_FXSAVE_FXRSTOR | |
| X86_StreamingSIMDExtensions | |
| X86_StreamingSIMDExtensions2 | |
| // X86_CPUSelfSnoop | |
| // X86_HyperThreading | |
| // X86_AutomaticClockControl | |
| // X86_IA64Processor | |
| 0; |
| |
| //Bits which describe the system hardware capabilities |
| //XXX Figure out what these should be |
| auxv.push_back(auxv_t(M5_AT_HWCAP, features)); |
| //The system page size |
| auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::VMPageSize)); |
| //Frequency at which times() increments |
| //Defined to be 100 in the kernel source. |
| auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); |
| // For statically linked executables, this is the virtual address of the |
| // program header tables if they appear in the executable image |
| auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); |
| // This is the size of a program header entry from the elf file. |
| auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); |
| // This is the number of program headers from the original elf file. |
| auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); |
| //This is the address of the elf "interpreter", It should be set |
| //to 0 for regular executables. It should be something else |
| //(not sure what) for dynamic libraries. |
| auxv.push_back(auxv_t(M5_AT_BASE, 0)); |
| |
| //XXX Figure out what this should be. |
| auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); |
| //The entry point to the program |
| auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); |
| //Different user and group IDs |
| auxv.push_back(auxv_t(M5_AT_UID, uid())); |
| auxv.push_back(auxv_t(M5_AT_EUID, euid())); |
| auxv.push_back(auxv_t(M5_AT_GID, gid())); |
| auxv.push_back(auxv_t(M5_AT_EGID, egid())); |
| //Whether to enable "secure mode" in the executable |
| auxv.push_back(auxv_t(M5_AT_SECURE, 0)); |
| //The address of 16 "random" bytes. |
| auxv.push_back(auxv_t(M5_AT_RANDOM, 0)); |
| //The name of the program |
| auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); |
| //The platform string |
| auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); |
| } |
| |
| //Figure out how big the initial stack needs to be |
| |
| // A sentry NULL void pointer at the top of the stack. |
| int sentry_size = intSize; |
| |
| //This is the name of the file which is present on the initial stack |
| //It's purpose is to let the user space linker examine the original file. |
| int file_name_size = filename.size() + 1; |
| |
| const int numRandomBytes = 16; |
| int aux_data_size = numRandomBytes; |
| |
| string platform = "x86_64"; |
| aux_data_size += platform.size() + 1; |
| |
| int env_data_size = 0; |
| for (int i = 0; i < envp.size(); ++i) { |
| env_data_size += envp[i].size() + 1; |
| } |
| int arg_data_size = 0; |
| for (int i = 0; i < argv.size(); ++i) { |
| arg_data_size += argv[i].size() + 1; |
| } |
| |
| //The info_block needs to be padded so it's size is a multiple of the |
| //alignment mask. Also, it appears that there needs to be at least some |
| //padding, so if the size is already a multiple, we need to increase it |
| //anyway. |
| int base_info_block_size = |
| sentry_size + file_name_size + env_data_size + arg_data_size; |
| |
| int info_block_size = roundUp(base_info_block_size, align); |
| |
| int info_block_padding = info_block_size - base_info_block_size; |
| |
| //Each auxilliary vector is two 8 byte words |
| int aux_array_size = intSize * 2 * (auxv.size() + 1); |
| |
| int envp_array_size = intSize * (envp.size() + 1); |
| int argv_array_size = intSize * (argv.size() + 1); |
| |
| int argc_size = intSize; |
| |
| //Figure out the size of the contents of the actual initial frame |
| int frame_size = |
| aux_array_size + |
| envp_array_size + |
| argv_array_size + |
| argc_size; |
| |
| //There needs to be padding after the auxiliary vector data so that the |
| //very bottom of the stack is aligned properly. |
| int partial_size = frame_size + aux_data_size; |
| int aligned_partial_size = roundUp(partial_size, align); |
| int aux_padding = aligned_partial_size - partial_size; |
| |
| int space_needed = |
| info_block_size + |
| aux_data_size + |
| aux_padding + |
| frame_size; |
| |
| stack_min = stack_base - space_needed; |
| stack_min = roundDown(stack_min, align); |
| stack_size = stack_base - stack_min; |
| |
| // map memory |
| allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize)); |
| |
| // map out initial stack contents |
| IntType sentry_base = stack_base - sentry_size; |
| IntType file_name_base = sentry_base - file_name_size; |
| IntType env_data_base = file_name_base - env_data_size; |
| IntType arg_data_base = env_data_base - arg_data_size; |
| IntType aux_data_base = arg_data_base - info_block_padding - aux_data_size; |
| IntType auxv_array_base = aux_data_base - aux_array_size - aux_padding; |
| IntType envp_array_base = auxv_array_base - envp_array_size; |
| IntType argv_array_base = envp_array_base - argv_array_size; |
| IntType argc_base = argv_array_base - argc_size; |
| |
| DPRINTF(Stack, "The addresses of items on the initial stack:\n"); |
| DPRINTF(Stack, "0x%x - file name\n", file_name_base); |
| DPRINTF(Stack, "0x%x - env data\n", env_data_base); |
| DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); |
| DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); |
| DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); |
| DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); |
| DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); |
| DPRINTF(Stack, "0x%x - argc \n", argc_base); |
| DPRINTF(Stack, "0x%x - stack min\n", stack_min); |
| |
| // write contents to stack |
| |
| // figure out argc |
| IntType argc = argv.size(); |
| IntType guestArgc = X86ISA::htog(argc); |
| |
| //Write out the sentry void * |
| IntType sentry_NULL = 0; |
| initVirtMem.writeBlob(sentry_base, |
| (uint8_t*)&sentry_NULL, sentry_size); |
| |
| //Write the file name |
| initVirtMem.writeString(file_name_base, filename.c_str()); |
| |
| //Fix up the aux vectors which point to data |
| assert(auxv[auxv.size() - 3].a_type == M5_AT_RANDOM); |
| auxv[auxv.size() - 3].a_val = aux_data_base; |
| assert(auxv[auxv.size() - 2].a_type == M5_AT_EXECFN); |
| auxv[auxv.size() - 2].a_val = argv_array_base; |
| assert(auxv[auxv.size() - 1].a_type == M5_AT_PLATFORM); |
| auxv[auxv.size() - 1].a_val = aux_data_base + numRandomBytes; |
| |
| //Copy the aux stuff |
| for(int x = 0; x < auxv.size(); x++) |
| { |
| initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, |
| (uint8_t*)&(auxv[x].a_type), intSize); |
| initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, |
| (uint8_t*)&(auxv[x].a_val), intSize); |
| } |
| //Write out the terminating zeroed auxilliary vector |
| const uint64_t zero = 0; |
| initVirtMem.writeBlob(auxv_array_base + 2 * intSize * auxv.size(), |
| (uint8_t*)&zero, 2 * intSize); |
| |
| initVirtMem.writeString(aux_data_base, platform.c_str()); |
| |
| copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); |
| copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); |
| |
| initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); |
| |
| ThreadContext *tc = system->getThreadContext(contextIds[0]); |
| //Set the stack pointer register |
| tc->setIntReg(StackPointerReg, stack_min); |
| |
| // There doesn't need to be any segment base added in since we're dealing |
| // with the flat segmentation model. |
| tc->pcState(objFile->entryPoint()); |
| |
| //Align the "stack_min" to a page boundary. |
| stack_min = roundDown(stack_min, pageSize); |
| |
| // num_processes++; |
| } |
| |
| void |
| X86_64LiveProcess::argsInit(int intSize, int pageSize) |
| { |
| std::vector<AuxVector<uint64_t> > extraAuxvs; |
| extraAuxvs.push_back(AuxVector<uint64_t>(M5_AT_SYSINFO_EHDR, |
| vsyscallPage.base)); |
| X86LiveProcess::argsInit<uint64_t>(pageSize, extraAuxvs); |
| } |
| |
| void |
| I386LiveProcess::argsInit(int intSize, int pageSize) |
| { |
| std::vector<AuxVector<uint32_t> > extraAuxvs; |
| //Tell the binary where the vsyscall part of the vsyscall page is. |
| extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO, |
| vsyscallPage.base + vsyscallPage.vsyscallOffset)); |
| extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO_EHDR, |
| vsyscallPage.base)); |
| X86LiveProcess::argsInit<uint32_t>(pageSize, extraAuxvs); |
| } |
| |
| void |
| X86LiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn retval) |
| { |
| tc->setIntReg(INTREG_RAX, retval.encodedValue()); |
| } |
| |
| X86ISA::IntReg |
| X86_64LiveProcess::getSyscallArg(ThreadContext *tc, int &i) |
| { |
| assert(i < NumArgumentRegs); |
| return tc->readIntReg(ArgumentReg[i++]); |
| } |
| |
| void |
| X86_64LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) |
| { |
| assert(i < NumArgumentRegs); |
| return tc->setIntReg(ArgumentReg[i], val); |
| } |
| |
| X86ISA::IntReg |
| I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i) |
| { |
| assert(i < NumArgumentRegs32); |
| return tc->readIntReg(ArgumentReg32[i++]); |
| } |
| |
| X86ISA::IntReg |
| I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i, int width) |
| { |
| assert(width == 32 || width == 64); |
| assert(i < NumArgumentRegs); |
| uint64_t retVal = tc->readIntReg(ArgumentReg32[i++]) & mask(32); |
| if (width == 64) |
| retVal |= ((uint64_t)tc->readIntReg(ArgumentReg[i++]) << 32); |
| return retVal; |
| } |
| |
| void |
| I386LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) |
| { |
| assert(i < NumArgumentRegs); |
| return tc->setIntReg(ArgumentReg[i], val); |
| } |
