/*
* 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 = 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 = (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 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);
}