X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Farch%2Fx86%2Fprocess.cc;h=cce8e3a3d7d4b438f52771330f45d15a1559babf;hb=52540b1b785aac9b307dfcc976527d94899deb94;hp=03680561286168c913529c596e47ac6945667e44;hpb=c4c8a121863fcbde7ba67823f06a3f7564c27cba;p=gem5.git diff --git a/src/arch/x86/process.cc b/src/arch/x86/process.cc index 036805612..cce8e3a3d 100644 --- a/src/arch/x86/process.cc +++ b/src/arch/x86/process.cc @@ -1,4 +1,16 @@ /* + * 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. * @@ -29,136 +41,346 @@ * Ali Saidi */ -/* - * Copyright (c) 2007 The Hewlett-Packard Development Company - * All rights reserved. - * - * Redistribution and use of this software in source and binary forms, - * with or without modification, are permitted provided that the - * following conditions are met: - * - * The software must be used only for Non-Commercial Use which means any - * use which is NOT directed to receiving any direct monetary - * compensation for, or commercial advantage from such use. Illustrative - * examples of non-commercial use are academic research, personal study, - * teaching, education and corporate research & development. - * Illustrative examples of commercial use are distributing products for - * commercial advantage and providing services using the software for - * commercial advantage. - * - * If you wish to use this software or functionality therein that may be - * covered by patents for commercial use, please contact: - * Director of Intellectual Property Licensing - * Office of Strategy and Technology - * Hewlett-Packard Company - * 1501 Page Mill Road - * Palo Alto, California 94304 - * - * 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 HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. No right of - * sublicense is granted herewith. Derivatives of the software and - * output created using the software may be prepared, but only for - * Non-Commercial Uses. Derivatives of the software may be shared with - * others provided: (i) the others agree to abide by the list of - * conditions herein which includes the Non-Commercial Use restrictions; - * and (ii) such Derivatives of the software include the above copyright - * notice to acknowledge the contribution from this software where - * applicable, this list of conditions and the disclaimer below. - * - * 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 - */ - +#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/object_file.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 "mem/translating_port.hh" #include "sim/process_impl.hh" +#include "sim/syscall_emul.hh" #include "sim/system.hh" using namespace std; using namespace X86ISA; -M5_64_auxv_t::M5_64_auxv_t(int64_t type, int64_t val) +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) { - a_type = TheISA::htog(type); - a_val = TheISA::htog(val); + brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); + brk_point = roundUp(brk_point, VMPageSize); } -X86LiveProcess::X86LiveProcess(const std::string &nm, ObjectFile *objFile, - System *_system, int stdin_fd, int stdout_fd, int stderr_fd, - std::vector &argv, std::vector &envp, - const std::string &cwd, - uint64_t _uid, uint64_t _euid, uint64_t _gid, uint64_t _egid, - uint64_t _pid, uint64_t _ppid) - : LiveProcess(nm, objFile, _system, stdin_fd, stdout_fd, stderr_fd, - argv, envp, cwd, _uid, _euid, _gid, _egid, _pid, _ppid) +X86_64LiveProcess::X86_64LiveProcess(LiveProcessParams *params, + ObjectFile *objFile, SyscallDesc *_syscallDescs, + int _numSyscallDescs) : + X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) { - brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); - brk_point = roundUp(brk_point, VMPageSize); - // Set pointer for next thread stack. Reserve 8M for main stack. - next_thread_stack_base = stack_base - (8 * 1024 * 1024); + vsyscallPage.base = 0xffffffffff600000ULL; + vsyscallPage.size = VMPageSize; + vsyscallPage.vtimeOffset = 0x400; + vsyscallPage.vgettimeofdayOffset = 0x410; // 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 = 0x2aaaaaaab000; + mmap_start = mmap_end = (Addr)0x2aaaaaaab000ULL; } -void X86LiveProcess::handleTrap(int trapNum, ThreadContext *tc) +void +I386LiveProcess::syscall(int64_t callnum, ThreadContext *tc) { - switch(trapNum) - { - default: - panic("Unimplemented trap to operating system: trap number %#x.\n", trapNum); + 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 -X86LiveProcess::startup() +X86_64LiveProcess::initState() { - argsInit(sizeof(IntReg), VMPageSize); - - //The AMD64 abi says that only rsp and rdx are defined at process - //startup. rsp will be set by argsInit, and I don't understand what - //rdx should be set to. The other floating point and integer registers - //will be zeroed by the register file constructors, but control registers - //should be initialized here. Since none of those are implemented, there - //isn't anything here. + 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 -X86LiveProcess::argsInit(int intSize, int pageSize) +I386LiveProcess::initState() { - typedef M5_64_auxv_t auxv_t; - Process::startup(); + 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 +void +X86LiveProcess::argsInit(int pageSize, + std::vector > extraAuxvs) +{ + int intSize = sizeof(IntType); + + typedef AuxVector auxv_t; + std::vector auxv = extraAuxvs; string filename; if(argv.size() < 1) @@ -167,7 +389,7 @@ X86LiveProcess::argsInit(int intSize, int pageSize) filename = argv[0]; //We want 16 byte alignment - Addr alignmentMask = ~mask(4); + uint64_t align = 16; // load object file into target memory objFile->loadSections(initVirtMem); @@ -254,6 +476,7 @@ X86LiveProcess::argsInit(int intSize, int pageSize) //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 @@ -262,7 +485,6 @@ X86LiveProcess::argsInit(int intSize, int pageSize) 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())); - //Defined to be 100 in the kernel source. //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. @@ -279,53 +501,48 @@ X86LiveProcess::argsInit(int intSize, int pageSize) 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 string "x86_64" with unknown meaning + //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 - // The unaccounted for 0 at the top of the stack - int mysterious_size = intSize; + // 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(); + int file_name_size = filename.size() + 1; + + const int numRandomBytes = 16; + int aux_data_size = numRandomBytes; string platform = "x86_64"; - int aux_data_size = platform.size() + 1; + 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(); + 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(); + arg_data_size += argv[i].size() + 1; } - //The auxiliary vector data needs to be padded so it's size is a multiple - //of the alignment mask. - int aux_padding = - ((aux_data_size + ~alignmentMask) & alignmentMask) - aux_data_size; - //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 info_block_size = - (mysterious_size + - file_name_size + - env_data_size + - arg_data_size + - ~alignmentMask) & alignmentMask; - - int info_block_padding = - info_block_size - - mysterious_size - - file_name_size - - env_data_size - - arg_data_size; + 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); @@ -335,97 +552,172 @@ X86LiveProcess::argsInit(int intSize, int pageSize) int argc_size = intSize; - int space_needed = - info_block_size + - aux_data_size + - aux_padding + + //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 &= alignmentMask; + stack_min = roundDown(stack_min, align); stack_size = stack_base - stack_min; // map memory - pTable->allocate(roundDown(stack_min, pageSize), - roundUp(stack_size, pageSize)); + allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize)); // map out initial stack contents - Addr mysterious_base = stack_base - mysterious_size; - Addr file_name_base = mysterious_base - file_name_size; - Addr env_data_base = file_name_base - env_data_size; - Addr arg_data_base = env_data_base - arg_data_size; - Addr aux_data_base = arg_data_base - aux_data_size - info_block_padding; - Addr auxv_array_base = aux_data_base - aux_array_size - aux_padding; - Addr envp_array_base = auxv_array_base - envp_array_size; - Addr argv_array_base = envp_array_base - argv_array_size; - Addr argc_base = argv_array_base - argc_size; - - DPRINTF(X86, "The addresses of items on the initial stack:\n"); - DPRINTF(X86, "0x%x - file name\n", file_name_base); - DPRINTF(X86, "0x%x - env data\n", env_data_base); - DPRINTF(X86, "0x%x - arg data\n", arg_data_base); - DPRINTF(X86, "0x%x - aux data\n", aux_data_base); - DPRINTF(X86, "0x%x - auxv array\n", auxv_array_base); - DPRINTF(X86, "0x%x - envp array\n", envp_array_base); - DPRINTF(X86, "0x%x - argv array\n", argv_array_base); - DPRINTF(X86, "0x%x - argc \n", argc_base); - DPRINTF(X86, "0x%x - stack min\n", stack_min); + 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 - uint64_t argc = argv.size(); - uint64_t guestArgc = TheISA::htog(argc); + IntType argc = argv.size(); + IntType guestArgc = X86ISA::htog(argc); - //Write out the mysterious 0 - uint64_t mysterious_zero = 0; - initVirtMem->writeBlob(mysterious_base, - (uint8_t*)&mysterious_zero, mysterious_size); + //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()); + initVirtMem.writeString(file_name_base, filename.c_str()); - //Fix up the aux vector which points to the "platform" string - assert(auxv[auxv.size() - 1].a_type = M5_AT_PLATFORM); - auxv[auxv.size() - 1].a_val = aux_data_base; + //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, + initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, (uint8_t*)&(auxv[x].a_type), intSize); - initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * 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(), + initVirtMem.writeBlob(auxv_array_base + 2 * intSize * auxv.size(), (uint8_t*)&zero, 2 * intSize); - initVirtMem->writeString(aux_data_base, platform.c_str()); + 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); + initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); - //Set up the thread context to start running the process - //Because of the peculiarities of how syscall works, I believe - //a process starts with r11 containing the value of eflags or maybe r11 - //from before the call to execve. Empirically this value is 0x200. - threadContexts[0]->setIntReg(INTREG_R11, 0x200); + ThreadContext *tc = system->getThreadContext(contextIds[0]); //Set the stack pointer register - threadContexts[0]->setIntReg(StackPointerReg, stack_min); + tc->setIntReg(StackPointerReg, stack_min); - Addr prog_entry = objFile->entryPoint(); - threadContexts[0]->setPC(prog_entry); - threadContexts[0]->setNextPC(prog_entry + sizeof(MachInst)); + // 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 > extraAuxvs; + extraAuxvs.push_back(AuxVector(M5_AT_SYSINFO_EHDR, + vsyscallPage.base)); + X86LiveProcess::argsInit(pageSize, extraAuxvs); +} + +void +I386LiveProcess::argsInit(int intSize, int pageSize) +{ + std::vector > extraAuxvs; + //Tell the binary where the vsyscall part of the vsyscall page is. + extraAuxvs.push_back(AuxVector(M5_AT_SYSINFO, + vsyscallPage.base + vsyscallPage.vsyscallOffset)); + extraAuxvs.push_back(AuxVector(M5_AT_SYSINFO_EHDR, + vsyscallPage.base)); + X86LiveProcess::argsInit(pageSize, extraAuxvs); +} + +void +X86LiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn return_value) +{ + tc->setIntReg(INTREG_RAX, return_value.value()); +} + +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); +}