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syscall_emul: [PATCH 15/22] add clone/execve for threading and multiprocess simulations

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Modifies the clone system call and adds execve system call. Requires allowing
processes to steal thread contexts from other processes in the same system
object and the ability to detach pieces of process state (such as MemState)
to allow dynamic sharing.
This commit is contained in:
Brandon Potter 2017-02-27 14:10:15 -05:00
parent 073cb26607
commit 2367198921
33 changed files with 833 additions and 285 deletions
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2
src/arch/alpha/linux/process.cc
View file

@ -440,7 +440,7 @@ SyscallDesc AlphaLinuxProcess::syscallDescs[] = {
/* 309 */ SyscallDesc("get_kernel_syms", unimplementedFunc),
/* 310 */ SyscallDesc("syslog", unimplementedFunc),
/* 311 */ SyscallDesc("reboot", unimplementedFunc),
/* 312 */ SyscallDesc("clone", cloneFunc),
/* 312 */ SyscallDesc("clone", cloneFunc<AlphaLinux>),
/* 313 */ SyscallDesc("uselib", unimplementedFunc),
/* 314 */ SyscallDesc("mlock", unimplementedFunc),
/* 315 */ SyscallDesc("munlock", unimplementedFunc),

25
src/arch/alpha/process.cc
View file

@ -50,19 +50,20 @@ using namespace std;
AlphaProcess::AlphaProcess(ProcessParams *params, ObjectFile *objFile)
: Process(params, objFile)
{
brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
brk_point = roundUp(brk_point, PageBytes);
memState->brkPoint = objFile->dataBase() + objFile->dataSize() +
objFile->bssSize();
memState->brkPoint = roundUp(memState->brkPoint, PageBytes);
// Set up stack. On Alpha, stack goes below text section. This
// code should get moved to some architecture-specific spot.
stack_base = objFile->textBase() - (409600+4096);
memState->stackBase = objFile->textBase() - (409600+4096);
// Set up region for mmaps. Tru64 seems to start just above 0 and
// grow up from there.
mmap_end = 0x10000;
memState->mmapEnd = 0x10000;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
}
@ -130,15 +131,15 @@ AlphaProcess::argsInit(int intSize, int pageSize)
space_needed = 32*1024;
// set bottom of stack
stack_min = stack_base - space_needed;
memState->stackMin = memState->stackBase - space_needed;
// align it
stack_min = roundDown(stack_min, pageSize);
stack_size = stack_base - stack_min;
memState->stackMin = roundDown(memState->stackMin, pageSize);
memState->stackSize = memState->stackBase - memState->stackMin;
// map memory
allocateMem(stack_min, roundUp(stack_size, pageSize));
allocateMem(memState->stackMin, roundUp(memState->stackSize, pageSize));
// map out initial stack contents
Addr argv_array_base = stack_min + intSize; // room for argc
Addr argv_array_base = memState->stackMin + intSize; // room for argc
Addr envp_array_base = argv_array_base + argv_array_size;
Addr auxv_array_base = envp_array_base + envp_array_size;
Addr arg_data_base = auxv_array_base + auxv_array_size;
@ -153,7 +154,7 @@ AlphaProcess::argsInit(int intSize, int pageSize)
else
panic("Unknown int size");
initVirtMem.writeBlob(stack_min, (uint8_t*)&argc, intSize);
initVirtMem.writeBlob(memState->stackMin, (uint8_t*)&argc, intSize);
copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
@ -170,7 +171,7 @@ AlphaProcess::argsInit(int intSize, int pageSize)
setSyscallArg(tc, 0, argc);
setSyscallArg(tc, 1, argv_array_base);
tc->setIntReg(StackPointerReg, stack_min);
tc->setIntReg(StackPointerReg, memState->stackMin);
tc->pcState(getStartPC());
}

2
src/arch/arm/linux/process.cc
View file

@ -241,7 +241,7 @@ static SyscallDesc syscallDescs32[] = {
/* 117 */ SyscallDesc("ipc", unimplementedFunc),
/* 118 */ SyscallDesc("fsync", unimplementedFunc),
/* 119 */ SyscallDesc("sigreturn", unimplementedFunc),
/* 120 */ SyscallDesc("clone", cloneFunc),
/* 120 */ SyscallDesc("clone", cloneFunc<ArmLinux32>),
/* 121 */ SyscallDesc("setdomainname", unimplementedFunc),
/* 122 */ SyscallDesc("uname", unameFunc32),
/* 123 */ SyscallDesc("unused#123", unimplementedFunc),

41
src/arch/arm/process.cc
View file

@ -70,34 +70,36 @@ ArmProcess32::ArmProcess32(ProcessParams *params, ObjectFile *objFile,
ObjectFile::Arch _arch)
: ArmProcess(params, objFile, _arch)
{
stack_base = 0xbf000000L;
memState->stackBase = 0xbf000000L;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
// Set up break point (Top of Heap)
brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
brk_point = roundUp(brk_point, PageBytes);
memState->brkPoint = objFile->dataBase() + objFile->dataSize() +
objFile->bssSize();
memState->brkPoint = roundUp(memState->brkPoint, PageBytes);
// Set up region for mmaps. For now, start at bottom of kuseg space.
mmap_end = 0x40000000L;
memState->mmapEnd = 0x40000000L;
}
ArmProcess64::ArmProcess64(ProcessParams *params, ObjectFile *objFile,
ObjectFile::Arch _arch)
: ArmProcess(params, objFile, _arch)
{
stack_base = 0x7fffff0000L;
memState->stackBase = 0x7fffff0000L;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
// Set up break point (Top of Heap)
brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
brk_point = roundUp(brk_point, PageBytes);
memState->brkPoint = objFile->dataBase() + objFile->dataSize() +
objFile->bssSize();
memState->brkPoint = roundUp(memState->brkPoint, PageBytes);
// Set up region for mmaps. For now, start at bottom of kuseg space.
mmap_end = 0x4000000000L;
memState->mmapEnd = 0x4000000000L;
}
void
@ -300,15 +302,16 @@ ArmProcess::argsInit(int pageSize, IntRegIndex spIndex)
int space_needed = frame_size + aux_padding;
stack_min = stack_base - space_needed;
stack_min = roundDown(stack_min, align);
stack_size = stack_base - stack_min;
memState->stackMin = memState->stackBase - space_needed;
memState->stackMin = roundDown(memState->stackMin, align);
memState->stackSize = memState->stackBase - memState->stackMin;
// map memory
allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize));
allocateMem(roundDown(memState->stackMin, pageSize),
roundUp(memState->stackSize, pageSize));
// map out initial stack contents
IntType sentry_base = stack_base - sentry_size;
IntType sentry_base = memState->stackBase - sentry_size;
IntType aux_data_base = sentry_base - aux_data_size;
IntType env_data_base = aux_data_base - env_data_size;
IntType arg_data_base = env_data_base - arg_data_size;
@ -329,7 +332,7 @@ ArmProcess::argsInit(int pageSize, IntRegIndex spIndex)
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);
DPRINTF(Stack, "0x%x - stack min\n", memState->stackMin);
// write contents to stack
@ -375,7 +378,7 @@ ArmProcess::argsInit(int pageSize, IntRegIndex spIndex)
ThreadContext *tc = system->getThreadContext(contextIds[0]);
//Set the stack pointer register
tc->setIntReg(spIndex, stack_min);
tc->setIntReg(spIndex, memState->stackMin);
//A pointer to a function to run when the program exits. We'll set this
//to zero explicitly to make sure this isn't used.
tc->setIntReg(ArgumentReg0, 0);
@ -401,8 +404,8 @@ ArmProcess::argsInit(int pageSize, IntRegIndex spIndex)
pc.set(getStartPC() & ~mask(1));
tc->pcState(pc);
//Align the "stack_min" to a page boundary.
stack_min = roundDown(stack_min, pageSize);
//Align the "stackMin" to a page boundary.
memState->stackMin = roundDown(memState->stackMin, pageSize);
}
ArmISA::IntReg

6
src/arch/generic/types.hh
View file

@ -148,6 +148,12 @@ class SimplePCState : public PCStateBase
npc(val + sizeof(MachInst));
};
void
setNPC(Addr val)
{
npc(val);
}
SimplePCState() {}
SimplePCState(Addr val) { set(val); }

25
src/arch/mips/process.cc
View file

@ -53,17 +53,18 @@ MipsProcess::MipsProcess(ProcessParams * params, ObjectFile *objFile)
{
// Set up stack. On MIPS, stack starts at the top of kuseg
// user address space. MIPS stack grows down from here
stack_base = 0x7FFFFFFF;
memState->stackBase = 0x7FFFFFFF;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
// Set up break point (Top of Heap)
brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
brk_point = roundUp(brk_point, PageBytes);
memState->brkPoint = objFile->dataBase() + objFile->dataSize() +
objFile->bssSize();
memState->brkPoint = roundUp(memState->brkPoint, PageBytes);
// Set up region for mmaps. Start it 1GB above the top of the heap.
mmap_end = brk_point + 0x40000000L;
memState->mmapEnd = memState->brkPoint + 0x40000000L;
}
void
@ -140,15 +141,15 @@ MipsProcess::argsInit(int pageSize)
env_data_size;
// set bottom of stack
stack_min = stack_base - space_needed;
memState->stackMin = memState->stackBase - space_needed;
// align it
stack_min = roundDown(stack_min, pageSize);
stack_size = stack_base - stack_min;
memState->stackMin = roundDown(memState->stackMin, pageSize);
memState->stackSize = memState->stackBase - memState->stackMin;
// map memory
allocateMem(stack_min, roundUp(stack_size, pageSize));
allocateMem(memState->stackMin, roundUp(memState->stackSize, pageSize));
// map out initial stack contents
IntType argv_array_base = stack_min + intSize; // room for argc
IntType argv_array_base = memState->stackMin + intSize; // room for argc
IntType envp_array_base = argv_array_base + argv_array_size;
IntType auxv_array_base = envp_array_base + envp_array_size;
IntType arg_data_base = auxv_array_base + auxv_array_size;
@ -159,7 +160,7 @@ MipsProcess::argsInit(int pageSize)
argc = htog((IntType)argc);
initVirtMem.writeBlob(stack_min, (uint8_t*)&argc, intSize);
initVirtMem.writeBlob(memState->stackMin, (uint8_t*)&argc, intSize);
copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
@ -184,7 +185,7 @@ MipsProcess::argsInit(int pageSize)
setSyscallArg(tc, 0, argc);
setSyscallArg(tc, 1, argv_array_base);
tc->setIntReg(StackPointerReg, stack_min);
tc->setIntReg(StackPointerReg, memState->stackMin);
tc->pcState(getStartPC());
}

28
src/arch/power/process.cc
View file

@ -51,17 +51,18 @@ using namespace PowerISA;
PowerProcess::PowerProcess(ProcessParams *params, ObjectFile *objFile)
: Process(params, objFile)
{
stack_base = 0xbf000000L;
memState->stackBase = 0xbf000000L;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
// Set up break point (Top of Heap)
brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
brk_point = roundUp(brk_point, PageBytes);
memState->brkPoint = objFile->dataBase() + objFile->dataSize() +
objFile->bssSize();
memState->brkPoint = roundUp(memState->brkPoint, PageBytes);
// Set up region for mmaps. For now, start at bottom of kuseg space.
mmap_end = 0x70000000L;
memState->mmapEnd = 0x70000000L;
}
void
@ -185,15 +186,16 @@ PowerProcess::argsInit(int intSize, int pageSize)
int space_needed = frame_size + aux_padding;
stack_min = stack_base - space_needed;
stack_min = roundDown(stack_min, align);
stack_size = stack_base - stack_min;
memState->stackMin = memState->stackBase - space_needed;
memState->stackMin = roundDown(memState->stackMin, align);
memState->stackSize = memState->stackBase - memState->stackMin;
// map memory
allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize));
allocateMem(roundDown(memState->stackMin, pageSize),
roundUp(memState->stackSize, pageSize));
// map out initial stack contents
uint32_t sentry_base = stack_base - sentry_size;
uint32_t sentry_base = memState->stackBase - sentry_size;
uint32_t aux_data_base = sentry_base - aux_data_size;
uint32_t env_data_base = aux_data_base - env_data_size;
uint32_t arg_data_base = env_data_base - arg_data_size;
@ -212,7 +214,7 @@ PowerProcess::argsInit(int intSize, int pageSize)
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);
DPRINTF(Stack, "0x%x - stack min\n", memState->stackMin);
// write contents to stack
@ -257,12 +259,12 @@ PowerProcess::argsInit(int intSize, int pageSize)
ThreadContext *tc = system->getThreadContext(contextIds[0]);
//Set the stack pointer register
tc->setIntReg(StackPointerReg, stack_min);
tc->setIntReg(StackPointerReg, memState->stackMin);
tc->pcState(getStartPC());
//Align the "stack_min" to a page boundary.
stack_min = roundDown(stack_min, pageSize);
memState->stackMin = roundDown(memState->stackMin, pageSize);
}
PowerISA::IntReg

29
src/arch/riscv/process.cc
View file

@ -56,16 +56,16 @@ RiscvProcess::RiscvProcess(ProcessParams * params,
{
// Set up stack. On RISC-V, stack starts at the top of kuseg
// user address space. RISC-V stack grows down from here
stack_base = 0x7FFFFFFF;
memState->stackBase = (Addr)0x7FFFFFFF;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
// Set up break point (Top of Heap)
brk_point = objFile->bssBase() + objFile->bssSize();
memState->brkPoint = objFile->bssBase() + objFile->bssSize();
// Set up region for mmaps. Start it 1GB above the top of the heap.
mmap_end = brk_point + 0x40000000L;
memState->mmapEnd = memState->brkPoint + 0x40000000L;
}
void
@ -124,18 +124,19 @@ RiscvProcess::argsInit(int pageSize)
env_data_size += env.size() + 1;
int auxv_array_size = 2 * sizeof(IntType)*auxv.size();
stack_size = sizeof(IntType) + argv_array_size + 2 * sizeof(Addr) +
arg_data_size + 2 * sizeof(Addr);
memState->stackSize = sizeof(IntType) + argv_array_size + 2 *
sizeof(Addr) + arg_data_size + 2 * sizeof(Addr);
if (!envp.empty()) {
stack_size += 2 * sizeof(Addr) + envp_array_size + 2 * sizeof(Addr) +
env_data_size;
memState->stackSize += 2 * sizeof(Addr) + envp_array_size + 2 *
sizeof(Addr) + env_data_size;
}
if (!auxv.empty())
stack_size += 2 * sizeof(Addr) + auxv_array_size;
stack_min = roundDown(stack_base - stack_size, pageSize);
allocateMem(stack_min, roundUp(stack_size, pageSize));
memState->stackSize += 2 * sizeof(Addr) + auxv_array_size;
memState->stackMin = roundDown(memState->stackBase - memState->stackSize,
pageSize);
allocateMem(memState->stackMin, roundUp(memState->stackSize, pageSize));
Addr argv_array_base = stack_min + sizeof(IntType);
Addr argv_array_base = memState->stackMin + sizeof(IntType);
Addr arg_data_base = argv_array_base + argv_array_size + 2 * sizeof(Addr);
Addr envp_array_base = arg_data_base + arg_data_size;
if (!envp.empty())
@ -160,7 +161,7 @@ RiscvProcess::argsInit(int pageSize)
}
}
Addr sp = stack_min;
Addr sp = memState->stackMin;
initVirtMem.writeBlob(sp, (uint8_t *)&argc, sizeof(IntType));
sp += sizeof(IntType);
for (Addr arg_pointer: arg_pointers) {
@ -211,7 +212,7 @@ RiscvProcess::argsInit(int pageSize)
}
ThreadContext *tc = system->getThreadContext(contextIds[0]);
tc->setIntReg(StackPointerReg, stack_min);
tc->setIntReg(StackPointerReg, memState->stackMin);
tc->pcState(getStartPC());
}

4
src/arch/sparc/linux/syscalls.cc
View file

@ -305,7 +305,7 @@ SyscallDesc SparcLinuxProcess::syscall32Descs[] = {
/* 214 */ SyscallDesc("sysinfo", sysinfoFunc<Sparc32Linux>), // 32 bit
/* 215 */ SyscallDesc("ipc", unimplementedFunc), // 32 bit
/* 216 */ SyscallDesc("sigreturn", unimplementedFunc), // 32 bit
/* 217 */ SyscallDesc("clone", cloneFunc),
/* 217 */ SyscallDesc("clone", cloneFunc<Sparc32Linux>),
/* 218 */ SyscallDesc("ioprio_get", unimplementedFunc), // 32 bit
/* 219 */ SyscallDesc("adjtimex", unimplementedFunc), // 32 bit
/* 220 */ SyscallDesc("sigprocmask", unimplementedFunc), // 32 bit
@ -611,7 +611,7 @@ SyscallDesc SparcLinuxProcess::syscallDescs[] = {
/* 214 */ SyscallDesc("sysinfo", sysinfoFunc<SparcLinux>),
/* 215 */ SyscallDesc("ipc", unimplementedFunc),
/* 216 */ SyscallDesc("sigreturn", unimplementedFunc),
/* 217 */ SyscallDesc("clone", cloneFunc),
/* 217 */ SyscallDesc("clone", cloneFunc<SparcLinux>),
/* 218 */ SyscallDesc("ioprio_get", unimplementedFunc),
/* 219 */ SyscallDesc("adjtimex", unimplementedFunc),
/* 220 */ SyscallDesc("sigprocmask", unimplementedFunc),

28
src/arch/sparc/process.cc
View file

@ -59,11 +59,12 @@ SparcProcess::SparcProcess(ProcessParams * params, ObjectFile *objFile,
{
// XXX all the below need to be updated for SPARC - Ali
brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
brk_point = roundUp(brk_point, PageBytes);
memState->brkPoint = objFile->dataBase() + objFile->dataSize() +
objFile->bssSize();
memState->brkPoint = roundUp(memState->brkPoint, PageBytes);
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
// Initialize these to 0s
fillStart = 0;
@ -324,15 +325,16 @@ SparcProcess::argsInit(int pageSize)
aux_padding +
frame_size;
stack_min = stack_base - space_needed;
stack_min = roundDown(stack_min, align);
stack_size = stack_base - stack_min;
memState->stackMin = memState->stackBase - space_needed;
memState->stackMin = roundDown(memState->stackMin, align);
memState->stackSize = memState->stackBase - memState->stackMin;
// Allocate space for the stack
allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize));
allocateMem(roundDown(memState->stackMin, pageSize),
roundUp(memState->stackSize, pageSize));
// map out initial stack contents
IntType sentry_base = stack_base - sentry_size;
IntType sentry_base = memState->stackBase - 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;
@ -356,9 +358,9 @@ SparcProcess::argsInit(int pageSize)
DPRINTF(Stack, "%#x - argv array\n", argv_array_base);
DPRINTF(Stack, "%#x - argc \n", argc_base);
DPRINTF(Stack, "%#x - window save\n", window_save_base);
DPRINTF(Stack, "%#x - stack min\n", stack_min);
DPRINTF(Stack, "%#x - stack min\n", memState->stackMin);
assert(window_save_base == stack_min);
assert(window_save_base == memState->stackMin);
// write contents to stack
@ -397,7 +399,7 @@ SparcProcess::argsInit(int pageSize)
// Set up space for the trap handlers into the processes address space.
// Since the stack grows down and there is reserved address space abov
// it, we can put stuff above it and stay out of the way.
fillStart = stack_base;
fillStart = memState->stackBase;
spillStart = fillStart + sizeof(MachInst) * numFillInsts;
ThreadContext *tc = system->getThreadContext(contextIds[0]);
@ -405,7 +407,7 @@ SparcProcess::argsInit(int pageSize)
// assert(NumArgumentRegs >= 2);
// tc->setIntReg(ArgumentReg[0], argc);
// tc->setIntReg(ArgumentReg[1], argv_array_base);
tc->setIntReg(StackPointerReg, stack_min - StackBias);
tc->setIntReg(StackPointerReg, memState->stackMin - StackBias);
// %g1 is a pointer to a function that should be run at exit. Since we
// don't have anything like that, it should be set to 0.
@ -414,7 +416,7 @@ SparcProcess::argsInit(int pageSize)
tc->pcState(getStartPC());
// Align the "stack_min" to a page boundary.
stack_min = roundDown(stack_min, pageSize);
memState->stackMin = roundDown(memState->stackMin, pageSize);
}
void

8
src/arch/sparc/process.hh
View file

@ -79,10 +79,10 @@ class Sparc32Process : public SparcProcess
{
// Set up stack. On SPARC Linux, stack goes from the top of memory
// downward, less the hole for the kernel address space.
stack_base = (Addr)0xf0000000ULL;
memState->stackBase = (Addr)0xf0000000ULL;
// Set up region for mmaps.
mmap_end = 0x70000000;
memState->mmapEnd = 0x70000000;
}
void initState();
@ -109,10 +109,10 @@ class Sparc64Process : public SparcProcess
{
// Set up stack. On SPARC Linux, stack goes from the top of memory
// downward, less the hole for the kernel address space.
stack_base = (Addr)0x80000000000ULL;
memState->stackBase = (Addr)0x80000000000ULL;
// Set up region for mmaps.
mmap_end = 0xfffff80000000000ULL;
memState->mmapEnd = 0xfffff80000000000ULL;
}
void initState();

24
src/arch/x86/linux/process.cc
View file

@ -276,10 +276,10 @@ static SyscallDesc syscallDescs64[] = {
/* 53 */ SyscallDesc("socketpair", unimplementedFunc),
/* 54 */ SyscallDesc("setsockopt", unimplementedFunc),
/* 55 */ SyscallDesc("getsockopt", unimplementedFunc),
/* 56 */ SyscallDesc("clone", cloneFunc),
/* 56 */ SyscallDesc("clone", cloneFunc<X86Linux64>),
/* 57 */ SyscallDesc("fork", unimplementedFunc),
/* 58 */ SyscallDesc("vfork", unimplementedFunc),
/* 59 */ SyscallDesc("execve", unimplementedFunc),
/* 59 */ SyscallDesc("execve", execveFunc<X86Linux64>),
/* 60 */ SyscallDesc("exit", exitFunc),
/* 61 */ SyscallDesc("wait4", unimplementedFunc),
/* 62 */ SyscallDesc("kill", unimplementedFunc),
@ -438,7 +438,7 @@ static SyscallDesc syscallDescs64[] = {
/* 215 */ SyscallDesc("epoll_wait_old", unimplementedFunc),
/* 216 */ SyscallDesc("remap_file_pages", unimplementedFunc),
/* 217 */ SyscallDesc("getdents64", unimplementedFunc),
/* 218 */ SyscallDesc("set_tid_address", unimplementedFunc),
/* 218 */ SyscallDesc("set_tid_address", setTidAddressFunc),
/* 219 */ SyscallDesc("restart_syscall", unimplementedFunc),
/* 220 */ SyscallDesc("semtimedop", unimplementedFunc),
/* 221 */ SyscallDesc("fadvise64", unimplementedFunc),
@ -542,6 +542,12 @@ X86_64LinuxProcess::X86_64LinuxProcess(ProcessParams * params,
sizeof(syscallDescs64) / sizeof(SyscallDesc))
{}
void X86_64LinuxProcess::clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *process, TheISA::IntReg flags)
{
X86_64Process::clone(old_tc, new_tc, (X86_64Process*)process, flags);
}
static SyscallDesc syscallDescs32[] = {
/* 0 */ SyscallDesc("restart_syscall", unimplementedFunc),
/* 1 */ SyscallDesc("exit", exitFunc),
@ -554,7 +560,7 @@ static SyscallDesc syscallDescs32[] = {
/* 8 */ SyscallDesc("creat", unimplementedFunc),
/* 9 */ SyscallDesc("link", unimplementedFunc),
/* 10 */ SyscallDesc("unlink", unimplementedFunc),
/* 11 */ SyscallDesc("execve", unimplementedFunc),
/* 11 */ SyscallDesc("execve", execveFunc<X86Linux32>),
/* 12 */ SyscallDesc("chdir", unimplementedFunc),
/* 13 */ SyscallDesc("time", timeFunc<X86Linux32>),
/* 14 */ SyscallDesc("mknod", unimplementedFunc),
@ -663,7 +669,7 @@ static SyscallDesc syscallDescs32[] = {
/* 117 */ SyscallDesc("ipc", unimplementedFunc),
/* 118 */ SyscallDesc("fsync", unimplementedFunc),
/* 119 */ SyscallDesc("sigreturn", unimplementedFunc),
/* 120 */ SyscallDesc("clone", unimplementedFunc),
/* 120 */ SyscallDesc("clone", cloneFunc<X86Linux32>),
/* 121 */ SyscallDesc("setdomainname", unimplementedFunc),
/* 122 */ SyscallDesc("uname", unameFunc),
/* 123 */ SyscallDesc("modify_ldt", unimplementedFunc),
@ -801,7 +807,7 @@ static SyscallDesc syscallDescs32[] = {
/* 255 */ SyscallDesc("epoll_ctl", unimplementedFunc),
/* 256 */ SyscallDesc("epoll_wait", unimplementedFunc),
/* 257 */ SyscallDesc("remap_file_pages", unimplementedFunc),
/* 258 */ SyscallDesc("set_tid_address", unimplementedFunc),
/* 258 */ SyscallDesc("set_tid_address", setTidAddressFunc),
/* 259 */ SyscallDesc("timer_create", unimplementedFunc),
/* 260 */ SyscallDesc("timer_settime", unimplementedFunc),
/* 261 */ SyscallDesc("timer_gettime", unimplementedFunc),
@ -873,3 +879,9 @@ I386LinuxProcess::I386LinuxProcess(ProcessParams * params, ObjectFile *objFile)
: I386Process(params, objFile, syscallDescs32,
sizeof(syscallDescs32) / sizeof(SyscallDesc))
{}
void I386LinuxProcess::clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *process, TheISA::IntReg flags)
{
I386Process::clone(old_tc, new_tc, (I386Process*)process, flags);
}

7
src/arch/x86/linux/process.hh
View file

@ -44,6 +44,9 @@
#include "arch/x86/process.hh"
#include "sim/process.hh"
struct ProcessParams;
struct ThreadContext;
namespace X86ISA {
class X86_64LinuxProcess : public X86_64Process
@ -51,6 +54,8 @@ class X86_64LinuxProcess : public X86_64Process
public:
/// Constructor.
X86_64LinuxProcess(ProcessParams * params, ObjectFile *objFile);
void clone(ThreadContext *old_tc, ThreadContext *new_tc, Process *process,
TheISA::IntReg flags);
};
class I386LinuxProcess : public I386Process
@ -58,6 +63,8 @@ class I386LinuxProcess : public I386Process
public:
/// Constructor.
I386LinuxProcess(ProcessParams * params, ObjectFile *objFile);
void clone(ThreadContext *old_tc, ThreadContext *new_tc, Process *process,
TheISA::IntReg flags);
};
} // namespace X86ISA

64
src/arch/x86/process.cc
View file

@ -100,8 +100,17 @@ X86Process::X86Process(ProcessParams * params, ObjectFile *objFile,
: Process(params, objFile), syscallDescs(_syscallDescs),
numSyscallDescs(_numSyscallDescs)
{
brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
brk_point = roundUp(brk_point, PageBytes);
memState->brkPoint = objFile->dataBase() + objFile->dataSize()
+ objFile->bssSize();
memState->brkPoint = roundUp(memState->brkPoint, PageBytes);
}
void X86Process::clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *p, TheISA::IntReg flags)
{
Process::clone(old_tc, new_tc, p, flags);
X86Process *process = (X86Process*)p;
*process = *this;
}
X86_64Process::X86_64Process(ProcessParams *params, ObjectFile *objFile,
@ -117,10 +126,10 @@ X86_64Process::X86_64Process(ProcessParams *params, ObjectFile *objFile,
// 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;
memState->stackBase = (Addr)0x7FFFFFFFF000ULL;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
// "mmap_base" is a function which defines where mmap region starts in
// the process address space.
@ -130,7 +139,7 @@ X86_64Process::X86_64Process(ProcessParams *params, ObjectFile *objFile,
// We do not use any address space layout randomization in gem5
// therefore the random fields become zero; the smallest gap space was
// chosen but gap could potentially be much larger.
mmap_end = (Addr)0x7FFFF7FFF000ULL;
memState->mmapEnd = (Addr)0x7FFFF7FFF000ULL;
}
void
@ -159,10 +168,10 @@ I386Process::I386Process(ProcessParams *params, ObjectFile *objFile,
vsyscallPage.vsyscallOffset = 0x400;
vsyscallPage.vsysexitOffset = 0x410;
stack_base = _gdtStart;
memState->stackBase = _gdtStart;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
memState->nextThreadStackBase = memState->stackBase - (8 * 1024 * 1024);
// "mmap_base" is a function which defines where mmap region starts in
// the process address space.
@ -172,7 +181,7 @@ I386Process::I386Process(ProcessParams *params, ObjectFile *objFile,
// We do not use any address space layout randomization in gem5
// therefore the random fields become zero; the smallest gap space was
// chosen but gap could potentially be much larger.
mmap_end = (Addr)0xB7FFF000ULL;
memState->mmapEnd = (Addr)0xB7FFF000ULL;
}
SyscallDesc*
@ -946,18 +955,21 @@ X86Process::argsInit(int pageSize,
aux_padding +
frame_size;
stack_min = stack_base - space_needed;
stack_min = roundDown(stack_min, align);
stack_size = roundUp(stack_base - stack_min, pageSize);
memState->stackMin = memState->stackBase - space_needed;
memState->stackMin = roundDown(memState->stackMin, align);
memState->stackSize = roundUp(memState->stackBase - memState->stackMin,
pageSize);
// map memory
Addr stack_end = roundDown(stack_base - stack_size, pageSize);
Addr stack_end = roundDown(memState->stackBase - memState->stackSize,
pageSize);
DPRINTF(Stack, "Mapping the stack: 0x%x %dB\n", stack_end, stack_size);
allocateMem(stack_end, stack_size);
DPRINTF(Stack, "Mapping the stack: 0x%x %dB\n",
stack_end, memState->stackSize);
allocateMem(stack_end, memState->stackSize);
// map out initial stack contents
IntType sentry_base = stack_base - sentry_size;
IntType sentry_base = memState->stackBase - 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;
@ -976,7 +988,7 @@ X86Process::argsInit(int pageSize,
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);
DPRINTF(Stack, "0x%x - stack min\n", memState->stackMin);
// write contents to stack
@ -1023,14 +1035,14 @@ X86Process::argsInit(int pageSize,
ThreadContext *tc = system->getThreadContext(contextIds[0]);
//Set the stack pointer register
tc->setIntReg(StackPointerReg, stack_min);
tc->setIntReg(StackPointerReg, memState->stackMin);
// There doesn't need to be any segment base added in since we're dealing
// with the flat segmentation model.
tc->pcState(getStartPC());
//Align the "stack_min" to a page boundary.
stack_min = roundDown(stack_min, pageSize);
memState->stackMin = roundDown(memState->stackMin, pageSize);
}
void
@ -1074,6 +1086,14 @@ X86_64Process::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val)
return tc->setIntReg(ArgumentReg[i], val);
}
void
X86_64Process::clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *p, TheISA::IntReg flags)
{
X86Process::clone(old_tc, new_tc, p, flags);
((X86_64Process*)p)->vsyscallPage = vsyscallPage;
}
X86ISA::IntReg
I386Process::getSyscallArg(ThreadContext *tc, int &i)
{
@ -1098,3 +1118,11 @@ I386Process::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val)
assert(i < NumArgumentRegs);
return tc->setIntReg(ArgumentReg[i], val);
}
void
I386Process::clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *p, TheISA::IntReg flags)
{
X86Process::clone(old_tc, new_tc, p, flags);
((I386Process*)p)->vsyscallPage = vsyscallPage;
}

47
src/arch/x86/process.hh
View file

@ -82,6 +82,21 @@ namespace X86ISA
SyscallDesc* getDesc(int callnum);
void setSyscallReturn(ThreadContext *tc, SyscallReturn return_value);
void clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *process, TheISA::IntReg flags);
X86Process &
operator=(const X86Process &in)
{
if (this == &in)
return *this;
_gdtStart = in._gdtStart;
_gdtSize = in._gdtSize;
syscallDescs = in.syscallDescs;
return *this;
}
};
class X86_64Process : public X86Process
@ -97,6 +112,20 @@ namespace X86ISA
Addr size;
Addr vtimeOffset;
Addr vgettimeofdayOffset;
VSyscallPage &
operator=(const VSyscallPage &in)
{
if (this == &in)
return *this;
base = in.base;
size = in.size;
vtimeOffset = in.vtimeOffset;
vgettimeofdayOffset = in.vgettimeofdayOffset;
return *this;
}
};
VSyscallPage vsyscallPage;
@ -108,6 +137,8 @@ namespace X86ISA
/// Explicitly import the otherwise hidden getSyscallArg
using Process::getSyscallArg;
void setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val);
void clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *process, TheISA::IntReg flags);
};
class I386Process : public X86Process
@ -123,6 +154,20 @@ namespace X86ISA
Addr size;
Addr vsyscallOffset;
Addr vsysexitOffset;
VSyscallPage &
operator=(const VSyscallPage &in)
{
if (this == &in)
return *this;
base = in.base;
size = in.size;
vsyscallOffset = in.vsyscallOffset;
vsysexitOffset = in.vsysexitOffset;
return *this;
}
};
VSyscallPage vsyscallPage;
@ -134,6 +179,8 @@ namespace X86ISA
X86ISA::IntReg getSyscallArg(ThreadContext *tc, int &i);
X86ISA::IntReg getSyscallArg(ThreadContext *tc, int &i, int width);
void setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val);
void clone(ThreadContext *old_tc, ThreadContext *new_tc,
Process *process, TheISA::IntReg flags);
};
/**

7
src/arch/x86/types.hh
View file

@ -305,6 +305,13 @@ namespace X86ISA
PCState() {}
PCState(Addr val) { set(val); }
void
setNPC(Addr val)
{
Base::setNPC(val);
_size = 0;
}
uint8_t size() const { return _size; }
void size(uint8_t newSize) { _size = newSize; }

8
src/cpu/checker/thread_context.hh
View file

@ -130,6 +130,8 @@ class CheckerThreadContext : public ThreadContext
Process *getProcessPtr() { return actualTC->getProcessPtr(); }
void setProcessPtr(Process *p) { actualTC->setProcessPtr(p); }
PortProxy &getPhysProxy() { return actualTC->getPhysProxy(); }
FSTranslatingPortProxy &getVirtProxy()
@ -254,6 +256,12 @@ class CheckerThreadContext : public ThreadContext
return actualTC->pcState(val);
}
void setNPC(Addr val)
{
checkerTC->setNPC(val);
actualTC->setNPC(val);
}
void pcStateNoRecord(const TheISA::PCState &val)
{
return actualTC->pcState(val);

2
src/cpu/o3/thread_context.hh
View file

@ -119,6 +119,8 @@ class O3ThreadContext : public ThreadContext
/** Returns a pointer to this thread's process. */
virtual Process *getProcessPtr() { return thread->getProcessPtr(); }
virtual void setProcessPtr(Process *p) { thread->setProcessPtr(p); }
virtual PortProxy &getPhysProxy() { return thread->getPhysProxy(); }
virtual FSTranslatingPortProxy &getVirtProxy();

6
src/cpu/simple_thread.hh
View file

@ -355,6 +355,12 @@ class SimpleThread : public ThreadState
return _pcState.nextInstAddr();
}
void
setNPC(Addr val)
{
_pcState.setNPC(val);
}
MicroPC
microPC()
{

12
src/cpu/thread_context.hh
View file

@ -161,6 +161,8 @@ class ThreadContext
virtual Process *getProcessPtr() = 0;
virtual void setProcessPtr(Process *p) = 0;
virtual Status status() const = 0;
virtual void setStatus(Status new_status) = 0;
@ -223,6 +225,14 @@ class ThreadContext
virtual void pcState(const TheISA::PCState &val) = 0;
void
setNPC(Addr val)
{
TheISA::PCState pc_state = pcState();
pc_state.setNPC(val);
pcState(pc_state);
}
virtual void pcStateNoRecord(const TheISA::PCState &val) = 0;
virtual Addr instAddr() = 0;
@ -360,6 +370,8 @@ class ProxyThreadContext : public ThreadContext
Process *getProcessPtr() { return actualTC->getProcessPtr(); }
void setProcessPtr(Process *p) { actualTC->setProcessPtr(p); }
Status status() const { return actualTC->status(); }
void setStatus(Status new_status) { actualTC->setStatus(new_status); }

15
src/cpu/thread_state.hh
View file

@ -107,6 +107,21 @@ struct ThreadState : public Serializable {
Process *getProcessPtr() { return process; }
void setProcessPtr(Process *p)
{
process = p;
/**
* When the process pointer changes while operating in SE Mode,
* the se translating port proxy needs to be reinitialized since it
* holds a pointer to the process class.
*/
if (proxy) {
delete proxy;
proxy = NULL;
initMemProxies(NULL);
}
}
SETranslatingPortProxy &getMemProxy();
/** Reads the number of instructions functionally executed and

11
src/gpu-compute/shader.cc
View file

@ -79,18 +79,19 @@ Shader::mmap(int length)
length = roundUp(length, TheISA::PageBytes);
Process *proc = gpuTc->getProcessPtr();
auto mem_state = proc->memState;
if (proc->mmapGrowsDown()) {
DPRINTF(HSAIL, "GROWS DOWN");
start = proc->mmap_end - length;
proc->mmap_end = start;
start = mem_state->mmapEnd - length;
mem_state->mmapEnd = start;
} else {
DPRINTF(HSAIL, "GROWS UP");
start = proc->mmap_end;
proc->mmap_end += length;
start = mem_state->mmapEnd;
mem_state->mmapEnd += length;
// assertion to make sure we don't overwrite the stack (it grows down)
assert(proc->mmap_end < proc->stack_base - proc->max_stack_size);
assert(mem_state->stackBase - proc->maxStackSize > mem_state->mmapEnd);
}
DPRINTF(HSAIL,"Shader::mmap start= %#x, %#x\n", start, length);

7
src/mem/page_table.cc
View file

@ -103,6 +103,13 @@ FuncPageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr)
}
}
void
FuncPageTable::getMappings(std::vector<std::pair<Addr, Addr>> *addr_maps)
{
for (auto &iter : pTable)
addr_maps->push_back(make_pair(iter.first, iter.second.pageStart()));
}
void
FuncPageTable::unmap(Addr vaddr, int64_t size)
{

5
src/mem/page_table.hh
View file

@ -194,6 +194,9 @@ class PageTableBase : public Serializable
pTableCache[2].valid = false;
}
}
virtual void getMappings(std::vector<std::pair<Addr, Addr>>
*addr_mappings) {};
};
/**
@ -239,6 +242,8 @@ class FuncPageTable : public PageTableBase
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
void getMappings(std::vector<std::pair<Addr, Addr>> *addr_maps) override;
};
/**

2
src/mem/se_translating_port_proxy.hh
View file

@ -83,6 +83,8 @@ class SETranslatingPortProxy : public PortProxy
SETranslatingPortProxy(MasterPort& port, Process* p, AllocType alloc);
virtual ~SETranslatingPortProxy();
void setPageTable(PageTableBase *p) { pTable = p; }
void setProcess(Process *p) { process = p; }
bool tryReadBlob(Addr addr, uint8_t *p, int size) const;
bool tryWriteBlob(Addr addr, const uint8_t *p, int size) const;
bool tryMemsetBlob(Addr addr, uint8_t val, int size) const;

2
src/sim/Process.py
View file

@ -40,7 +40,7 @@ class Process(SimObject):
useArchPT = Param.Bool('false', 'maintain an in-memory version of the page\
table in an architecture-specific format')
kvmInSE = Param.Bool('false', 'initialize the process for KvmCPU in SE')
max_stack_size = Param.MemorySize('64MB', 'maximum size of the stack')
maxStackSize = Param.MemorySize('64MB', 'maximum size of the stack')
uid = Param.Int(100, 'user id')
euid = Param.Int(100, 'effective user id')

7
src/sim/fd_array.cc
View file

@ -322,6 +322,13 @@ FDArray::getFDEntry(int tgt_fd)
return _fdArray[tgt_fd];
}
void
FDArray::setFDEntry(int tgt_fd, std::shared_ptr<FDEntry> fdep)
{
assert(0 <= tgt_fd && tgt_fd < _fdArray.size());
_fdArray[tgt_fd] = fdep;
}
int
FDArray::closeFDEntry(int tgt_fd)
{

8
src/sim/fd_array.hh
View file

@ -103,6 +103,14 @@ class FDArray
*/
int getSize() const { return _fdArray.size(); }
/**
* Put the pointer specified by fdep into the _fdArray entry indexed
* by tgt_fd.
* @param tgt_fd Use target file descriptors to index the array.
* @param fdep Incoming pointer used to set the entry pointed to by tgt_fd.
*/
void setFDEntry(int tgt_fd, std::shared_ptr<FDEntry> fdep);
/**
* Try to close the host file descriptor. If successful, set the
* specified file descriptor entry object pointer to nullptr.

201
src/sim/process.cc
View file

@ -95,9 +95,6 @@ using namespace TheISA;
Process::Process(ProcessParams * params, ObjectFile * obj_file)
: SimObject(params), system(params->system),
brk_point(0), stack_base(0), stack_size(0), stack_min(0),
max_stack_size(params->max_stack_size),
next_thread_stack_base(0),
useArchPT(params->useArchPT),
kvmInSE(params->kvmInSE),
pTable(useArchPT ?
@ -113,10 +110,10 @@ Process::Process(ProcessParams * params, ObjectFile * obj_file)
_gid(params->gid), _egid(params->egid),
_pid(params->pid), _ppid(params->ppid),
_pgid(params->pgid), drivers(params->drivers),
fds(make_shared<FDArray>(params->input, params->output, params->errout))
fds(make_shared<FDArray>(params->input, params->output, params->errout)),
maxStackSize(params->maxStackSize),
childClearTID(0)
{
mmap_end = 0;
if (_pid >= System::maxPID)
fatal("_pid is too large: %d", _pid);
@ -124,20 +121,119 @@ Process::Process(ProcessParams * params, ObjectFile * obj_file)
if (!ret_pair.second)
fatal("_pid %d is already used", _pid);
// load up symbols, if any... these may be used for debugging or
// profiling.
/**
* Linux bundles together processes into this concept called a thread
* group. The thread group is responsible for recording which processes
* behave as threads within a process context. The thread group leader
* is the process who's tgid is equal to its pid. Other processes which
* belong to the thread group, but do not lead the thread group, are
* treated as child threads. These threads are created by the clone system
* call with options specified to create threads (differing from the
* options used to implement a fork). By default, set up the tgid/pid
* with a new, equivalent value. If CLONE_THREAD is specified, patch
* the tgid value with the old process' value.
*/
_tgid = params->pid;
exitGroup = new bool();
memState = new MemState();
sigchld = new bool();
if (!debugSymbolTable) {
debugSymbolTable = new SymbolTable();
if (!objFile->loadGlobalSymbols(debugSymbolTable) ||
!objFile->loadLocalSymbols(debugSymbolTable) ||
!objFile->loadWeakSymbols(debugSymbolTable)) {
// didn't load any symbols
delete debugSymbolTable;
debugSymbolTable = NULL;
}
}
}
void
Process::clone(ThreadContext *otc, ThreadContext *ntc,
Process *np, TheISA::IntReg flags)
{
if (CLONE_VM & flags) {
/**
* Share the process memory address space between the new process
* and the old process. Changes in one will be visible in the other
* due to the pointer use.
*/
delete np->pTable;
np->pTable = pTable;
ntc->getMemProxy().setPageTable(np->pTable);
delete np->memState;
np->memState = memState;
} else {
/**
* Duplicate the process memory address space. The state needs to be
* copied over (rather than using pointers to share everything).
*/
typedef std::vector<pair<Addr,Addr>> MapVec;
MapVec mappings;
pTable->getMappings(&mappings);
for (auto map : mappings) {
Addr paddr, vaddr = map.first;
bool alloc_page = !(np->pTable->translate(vaddr, paddr));
np->replicatePage(vaddr, paddr, otc, ntc, alloc_page);
}
*np->memState = *memState;
}
if (CLONE_FILES & flags) {
/**
* The parent and child file descriptors are shared because the
* two FDArray pointers are pointing to the same FDArray. Opening
* and closing file descriptors will be visible to both processes.
*/
np->fds = fds;
} else {
/**
* Copy the file descriptors from the old process into the new
* child process. The file descriptors entry can be opened and
* closed independently of the other process being considered. The
* host file descriptors are also dup'd so that the flags for the
* host file descriptor is independent of the other process.
*/
for (int tgt_fd = 0; tgt_fd < fds->getSize(); tgt_fd++) {
std::shared_ptr<FDArray> nfds = np->fds;
std::shared_ptr<FDEntry> this_fde = (*fds)[tgt_fd];
if (!this_fde) {
nfds->setFDEntry(tgt_fd, nullptr);
continue;
}
nfds->setFDEntry(tgt_fd, this_fde->clone());
auto this_hbfd = std::dynamic_pointer_cast<HBFDEntry>(this_fde);
if (!this_hbfd)
continue;
int this_sim_fd = this_hbfd->getSimFD();
if (this_sim_fd <= 2)
continue;
int np_sim_fd = dup(this_sim_fd);
assert(np_sim_fd != -1);
auto nhbfd = std::dynamic_pointer_cast<HBFDEntry>((*nfds)[tgt_fd]);
nhbfd->setSimFD(np_sim_fd);
}
}
if (CLONE_THREAD & flags) {
np->_tgid = _tgid;
delete np->exitGroup;
np->exitGroup = exitGroup;
}
np->argv.insert(np->argv.end(), argv.begin(), argv.end());
np->envp.insert(np->envp.end(), envp.begin(), envp.end());
}
void
Process::regStats()
{
@ -145,8 +241,8 @@ Process::regStats()
using namespace Stats;
num_syscalls
.name(name() + ".num_syscalls")
numSyscalls
.name(name() + ".numSyscalls")
.desc("Number of system calls")
;
}
@ -154,14 +250,26 @@ Process::regStats()
ThreadContext *
Process::findFreeContext()
{
for (int id : contextIds) {
ThreadContext *tc = system->getThreadContext(id);
if (tc->status() == ThreadContext::Halted)
return tc;
for (auto &it : system->threadContexts) {
if (ThreadContext::Halted == it->status())
return it;
}
return NULL;
}
void
Process::revokeThreadContext(int context_id)
{
std::vector<ContextID>::iterator it;
for (it = contextIds.begin(); it != contextIds.end(); it++) {
if (*it == context_id) {
contextIds.erase(it);
return;
}
}
warn("Unable to find thread context to revoke");
}
void
Process::initState()
{
@ -193,24 +301,44 @@ Process::allocateMem(Addr vaddr, int64_t size, bool clobber)
clobber ? PageTableBase::Clobber : PageTableBase::Zero);
}
void
Process::replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
ThreadContext *new_tc, bool allocate_page)
{
if (allocate_page)
new_paddr = system->allocPhysPages(1);
// Read from old physical page.
uint8_t *buf_p = new uint8_t[PageBytes];
old_tc->getMemProxy().readBlob(vaddr, buf_p, PageBytes);
// Create new mapping in process address space by clobbering existing
// mapping (if any existed) and then write to the new physical page.
bool clobber = true;
pTable->map(vaddr, new_paddr, PageBytes, clobber);
new_tc->getMemProxy().writeBlob(vaddr, buf_p, PageBytes);
delete[] buf_p;
}
bool
Process::fixupStackFault(Addr vaddr)
{
// Check if this is already on the stack and there's just no page there
// yet.
if (vaddr >= stack_min && vaddr < stack_base) {
if (vaddr >= memState->stackMin && vaddr < memState->stackBase) {
allocateMem(roundDown(vaddr, PageBytes), PageBytes);
return true;
}
// We've accessed the next page of the stack, so extend it to include
// this address.
if (vaddr < stack_min && vaddr >= stack_base - max_stack_size) {
while (vaddr < stack_min) {
stack_min -= TheISA::PageBytes;
if (stack_base - stack_min > max_stack_size)
if (vaddr < memState->stackMin
&& vaddr >= memState->stackBase - maxStackSize) {
while (vaddr < memState->stackMin) {
memState->stackMin -= TheISA::PageBytes;
if (memState->stackBase - memState->stackMin > maxStackSize)
fatal("Maximum stack size exceeded\n");
allocateMem(stack_min, TheISA::PageBytes);
allocateMem(memState->stackMin, TheISA::PageBytes);
inform("Increasing stack size by one page.");
};
return true;
@ -221,12 +349,12 @@ Process::fixupStackFault(Addr vaddr)
void
Process::serialize(CheckpointOut &cp) const
{
SERIALIZE_SCALAR(brk_point);
SERIALIZE_SCALAR(stack_base);
SERIALIZE_SCALAR(stack_size);
SERIALIZE_SCALAR(stack_min);
SERIALIZE_SCALAR(next_thread_stack_base);
SERIALIZE_SCALAR(mmap_end);
SERIALIZE_SCALAR(memState->brkPoint);
SERIALIZE_SCALAR(memState->stackBase);
SERIALIZE_SCALAR(memState->stackSize);
SERIALIZE_SCALAR(memState->stackMin);
SERIALIZE_SCALAR(memState->nextThreadStackBase);
SERIALIZE_SCALAR(memState->mmapEnd);
pTable->serialize(cp);
/**
* Checkpoints for file descriptors currently do not work. Need to
@ -244,12 +372,12 @@ Process::serialize(CheckpointOut &cp) const
void
Process::unserialize(CheckpointIn &cp)
{
UNSERIALIZE_SCALAR(brk_point);
UNSERIALIZE_SCALAR(stack_base);
UNSERIALIZE_SCALAR(stack_size);
UNSERIALIZE_SCALAR(stack_min);
UNSERIALIZE_SCALAR(next_thread_stack_base);
UNSERIALIZE_SCALAR(mmap_end);
UNSERIALIZE_SCALAR(memState->brkPoint);
UNSERIALIZE_SCALAR(memState->stackBase);
UNSERIALIZE_SCALAR(memState->stackSize);
UNSERIALIZE_SCALAR(memState->stackMin);
UNSERIALIZE_SCALAR(memState->nextThreadStackBase);
UNSERIALIZE_SCALAR(memState->mmapEnd);
pTable->unserialize(cp);
/**
* Checkpoints for file descriptors currently do not work. Need to
@ -278,7 +406,7 @@ Process::map(Addr vaddr, Addr paddr, int size, bool cacheable)
void
Process::syscall(int64_t callnum, ThreadContext *tc, Fault *fault)
{
num_syscalls++;
numSyscalls++;
SyscallDesc *desc = getDesc(callnum);
if (desc == NULL)
@ -318,12 +446,13 @@ Process::updateBias()
// We are allocating the memory area; set the bias to the lowest address
// in the allocated memory region.
Addr ld_bias = mmapGrowsDown() ? mmap_end - interp_mapsize : mmap_end;
Addr *end = &memState->mmapEnd;
Addr ld_bias = mmapGrowsDown() ? *end - interp_mapsize : *end;
// Adjust the process mmap area to give the interpreter room; the real
// execve system call would just invoke the kernel's internal mmap
// functions to make these adjustments.
mmap_end = mmapGrowsDown() ? ld_bias : mmap_end + interp_mapsize;
*end = mmapGrowsDown() ? ld_bias : *end + interp_mapsize;
interp->updateBias(ld_bias);
}

71
src/sim/process.hh
View file

@ -72,6 +72,39 @@ class Process : public SimObject
{ }
};
struct MemState
{
Addr brkPoint;
Addr stackBase;
unsigned stackSize;
Addr stackMin;
Addr nextThreadStackBase;
Addr mmapEnd;
MemState()
: brkPoint(0), stackBase(0), stackSize(0), stackMin(0),
nextThreadStackBase(0), mmapEnd(0)
{ }
MemState&
operator=(const MemState &in)
{
if (this == &in)
return *this;
brkPoint = in.brkPoint;
stackBase = in.stackBase;
stackSize = in.stackSize;
stackMin = in.stackMin;
nextThreadStackBase = in.nextThreadStackBase;
mmapEnd = in.mmapEnd;
return *this;
}
void serialize(CheckpointOut &cp) const;
void unserialize(CheckpointIn &cp);
};
Process(ProcessParams *params, ObjectFile *obj_file);
void serialize(CheckpointOut &cp) const override;
@ -140,7 +173,13 @@ class Process : public SimObject
ThreadContext *findFreeContext();
/**
* Does mmap region grow upward or downward from mmap_end? Most
* After delegating a thread context to a child process
* no longer should relate to the ThreadContext
*/
void revokeThreadContext(int context_id);
/**
* Does mmap region grow upward or downward from mmapEnd? Most
* platforms grow downward, but a few (such as Alpha) grow upward
* instead, so they can override this method to return false.
*/
@ -161,6 +200,12 @@ class Process : public SimObject
*/
bool map(Addr vaddr, Addr paddr, int size, bool cacheable = true);
void replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc,
ThreadContext *new_tc, bool alloc_page);
void clone(ThreadContext *old_tc, ThreadContext *new_tc, Process *new_p,
TheISA::IntReg flags);
// list of all blocked contexts
std::list<WaitRec> waitList;
@ -170,15 +215,7 @@ class Process : public SimObject
// system object which owns this process
System *system;
Addr brk_point; // top of the data segment
Addr stack_base; // stack segment base
unsigned stack_size; // initial stack size
Addr stack_min; // furthest address accessed from stack base
Addr max_stack_size; // the maximum size allowed for the stack
Addr next_thread_stack_base; // addr for next region w/ multithreaded apps
Addr mmap_end; // base of automatic mmap region allocs
Stats::Scalar num_syscalls; // track how many system calls are executed
Stats::Scalar numSyscalls; // track how many system calls are executed
bool useArchPT; // flag for using architecture specific page table
bool kvmInSE; // running KVM requires special initialization
@ -209,6 +246,20 @@ class Process : public SimObject
std::vector<EmulatedDriver *> drivers;
std::shared_ptr<FDArray> fds;
bool *exitGroup;
Addr maxStackSize;
MemState *memState;
/**
* Calls a futex wakeup at the address specified by this pointer when
* this process exits.
*/
uint64_t childClearTID;
// Process was forked with SIGCHLD set.
bool *sigchld;
};
#endif // __PROCESS_HH__

4
src/sim/syscall_desc.hh
View file

@ -107,6 +107,10 @@ class SyscallDesc {
std::string name() { return _name; }
int getFlags() const { return _flags; }
void setFlags(int flags) { _flags = flags; }
private:
/** System call name (e.g., open, mmap, clone, socket, etc.) */
std::string _name;

141
src/sim/syscall_emul.cc
View file

@ -74,18 +74,41 @@ ignoreFunc(SyscallDesc *desc, int callnum, Process *process,
return 0;
}
static void
exitFutexWake(ThreadContext *tc, uint64_t uaddr)
{
std::map<uint64_t, std::list<ThreadContext *> * >
&futex_map = tc->getSystemPtr()->futexMap;
int wokenUp = 0;
std::list<ThreadContext *> * tcWaitList;
if (futex_map.count(uaddr)) {
tcWaitList = futex_map.find(uaddr)->second;
if (tcWaitList->size() > 0) {
tcWaitList->front()->activate();
tcWaitList->pop_front();
wokenUp++;
}
if (tcWaitList->empty()) {
futex_map.erase(uaddr);
delete tcWaitList;
}
}
DPRINTF(SyscallVerbose, "exit: FUTEX_WAKE, activated %d waiting "
"thread contexts\n", wokenUp);
}
SyscallReturn
exitFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
exitFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
{
if (process->system->numRunningContexts() == 1) {
// Last running context... exit simulator
if (p->system->numRunningContexts() == 1 && !p->childClearTID) {
// Last running free-parent context; exit simulator.
int index = 0;
exitSimLoop("target called exit()",
process->getSyscallArg(tc, index) & 0xff);
p->getSyscallArg(tc, index) & 0xff);
} else {
// other running threads... just halt this one
if (p->childClearTID)
exitFutexWake(tc, p->childClearTID);
tc->halt();
}
@ -130,11 +153,12 @@ brkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
// in Linux at least, brk(0) returns the current break value
// (note that the syscall and the glibc function have different behavior)
if (new_brk == 0)
return p->brk_point;
return p->memState->brkPoint;
if (new_brk > p->brk_point) {
if (new_brk > p->memState->brkPoint) {
// might need to allocate some new pages
for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point,
for (ChunkGenerator gen(p->memState->brkPoint,
new_brk - p->memState->brkPoint,
PageBytes); !gen.done(); gen.next()) {
if (!p->pTable->translate(gen.addr()))
p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes);
@ -159,12 +183,22 @@ brkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
}
}
p->brk_point = new_brk;
p->memState->brkPoint = new_brk;
DPRINTF_SYSCALL(Verbose, "brk: break point changed to: %#X\n",
p->brk_point);
return p->brk_point;
p->memState->brkPoint);
return p->memState->brkPoint;
}
SyscallReturn
setTidAddressFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
{
int index = 0;
uint64_t tidPtr = process->getSyscallArg(tc, index);
process->childClearTID = tidPtr;
return process->pid();
}
SyscallReturn
closeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc)
@ -860,89 +894,6 @@ getegidFunc(SyscallDesc *desc, int callnum, Process *process,
return process->egid();
}
SyscallReturn
cloneFunc(SyscallDesc *desc, int callnum, Process *process,
ThreadContext *tc)
{
int index = 0;
IntReg flags = process->getSyscallArg(tc, index);
IntReg newStack = process->getSyscallArg(tc, index);
DPRINTF(SyscallVerbose, "In sys_clone:\n");
DPRINTF(SyscallVerbose, " Flags=%llx\n", flags);
DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack);
if (flags != 0x10f00) {
warn("This sys_clone implementation assumes flags "
"CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD "
"(0x10f00), and may not work correctly with given flags "
"0x%llx\n", flags);
}
ThreadContext* ctc; // child thread context
if ((ctc = process->findFreeContext())) {
DPRINTF(SyscallVerbose, " Found unallocated thread context\n");
ctc->clearArchRegs();
// Arch-specific cloning code
#if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA
// Cloning the misc. regs for these archs is enough
TheISA::copyMiscRegs(tc, ctc);
#elif THE_ISA == SPARC_ISA
TheISA::copyRegs(tc, ctc);
// TODO: Explain what this code actually does :-)
ctc->setIntReg(NumIntArchRegs + 6, 0);
ctc->setIntReg(NumIntArchRegs + 4, 0);
ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2);
ctc->setIntReg(NumIntArchRegs + 5, NWindows);
ctc->setMiscReg(MISCREG_CWP, 0);
ctc->setIntReg(NumIntArchRegs + 7, 0);
ctc->setMiscRegNoEffect(MISCREG_TL, 0);
ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY);
for (int y = 8; y < 32; y++)
ctc->setIntReg(y, tc->readIntReg(y));
#elif THE_ISA == ARM_ISA
TheISA::copyRegs(tc, ctc);
#else
fatal("sys_clone is not implemented for this ISA\n");
#endif
// Set up stack register
ctc->setIntReg(TheISA::StackPointerReg, newStack);
// Set up syscall return values in parent and child
ctc->setIntReg(ReturnValueReg, 0); // return value, child
// Alpha needs SyscallSuccessReg=0 in child
#if THE_ISA == ALPHA_ISA
ctc->setIntReg(TheISA::SyscallSuccessReg, 0);
#endif
// In SPARC/Linux, clone returns 0 on pseudo-return register if
// parent, non-zero if child
#if THE_ISA == SPARC_ISA
tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0);
ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1);
#endif
ctc->pcState(tc->nextInstAddr());
ctc->activate();
// Should return nonzero child TID in parent's syscall return register,
// but for our pthread library any non-zero value will work
return 1;
} else {
fatal("Called sys_clone, but no unallocated thread contexts found!\n");
return 0;
}
}
SyscallReturn
fallocateFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
{

269
src/sim/syscall_emul.hh
View file

@ -81,6 +81,7 @@
#include <memory>
#include <string>
#include "arch/utility.hh"
#include "base/intmath.hh"
#include "base/loader/object_file.hh"
#include "base/misc.hh"
@ -90,14 +91,14 @@
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "mem/page_table.hh"
#include "params/Process.hh"
#include "sim/emul_driver.hh"
#include "sim/process.hh"
#include "sim/syscall_debug_macros.hh"
#include "sim/syscall_desc.hh"
#include "sim/syscall_emul_buf.hh"
#include "sim/syscall_return.hh"
class SyscallDesc;
//////////////////////////////////////////////////////////////////////
//
// The following emulation functions are generic enough that they
@ -130,6 +131,10 @@ SyscallReturn exitFunc(SyscallDesc *desc, int num,
SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
Process *p, ThreadContext *tc);
/// Target set_tid_address() handler.
SyscallReturn setTidAddressFunc(SyscallDesc *desc, int num,
Process *p, ThreadContext *tc);
/// Target getpagesize() handler.
SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
Process *p, ThreadContext *tc);
@ -142,7 +147,7 @@ SyscallReturn brkFunc(SyscallDesc *desc, int num,
SyscallReturn closeFunc(SyscallDesc *desc, int num,
Process *p, ThreadContext *tc);
/// Target read() handler.
// Target read() handler.
SyscallReturn readFunc(SyscallDesc *desc, int num,
Process *p, ThreadContext *tc);
@ -272,10 +277,6 @@ SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
SyscallReturn getegidFunc(SyscallDesc *desc, int num,
Process *p, ThreadContext *tc);
/// Target clone() handler.
SyscallReturn cloneFunc(SyscallDesc *desc, int num,
Process *p, ThreadContext *tc);
/// Target access() handler
SyscallReturn accessFunc(SyscallDesc *desc, int num,
Process *p, ThreadContext *tc);
@ -304,14 +305,14 @@ futexFunc(SyscallDesc *desc, int callnum, Process *process,
std::map<uint64_t, std::list<ThreadContext *> * >
&futex_map = tc->getSystemPtr()->futexMap;
DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
DPRINTF(SyscallVerbose, "futex: Address=%llx, op=%d, val=%d\n",
uaddr, op, val);
op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
if (op == OS::TGT_FUTEX_WAIT) {
if (timeout != 0) {
warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
warn("futex: FUTEX_WAIT with non-null timeout unimplemented;"
"we'll wait indefinitely");
}
@ -321,7 +322,7 @@ futexFunc(SyscallDesc *desc, int callnum, Process *process,
delete[] buf;
if (val != mem_val) {
DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
DPRINTF(SyscallVerbose, "futex: FUTEX_WAKE, read: %d, "
"expected: %d\n", mem_val, val);
return -OS::TGT_EWOULDBLOCK;
}
@ -336,8 +337,8 @@ futexFunc(SyscallDesc *desc, int callnum, Process *process,
std::list<ThreadContext *> * >(uaddr, tcWaitList));
}
tcWaitList->push_back(tc);
DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
"thread context\n");
DPRINTF(SyscallVerbose, "futex: FUTEX_WAIT, suspending calling thread "
"context on address 0x%lx\n", uaddr);
tc->suspend();
return 0;
} else if (op == OS::TGT_FUTEX_WAKE){
@ -355,11 +356,12 @@ futexFunc(SyscallDesc *desc, int callnum, Process *process,
delete tcWaitList;
}
}
DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
"thread contexts\n", wokenUp);
DPRINTF(SyscallVerbose, "futex: FUTEX_WAKE, activated %d waiting "
"thread context on address 0x%lx\n",
wokenUp, uaddr);
return wokenUp;
} else {
warn("sys_futex: op %d is not implemented, just returning...", op);
warn("futex: op %d is not implemented, just returning...", op);
return 0;
}
@ -883,11 +885,11 @@ mremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc)
new_length = roundUp(new_length, TheISA::PageBytes);
if (new_length > old_length) {
if ((start + old_length) == process->mmap_end &&
if ((start + old_length) == process->memState->mmapEnd &&
(!use_provided_address || provided_address == start)) {
uint64_t diff = new_length - old_length;
process->allocateMem(process->mmap_end, diff);
process->mmap_end += diff;
process->allocateMem(process->memState->mmapEnd, diff);
process->memState->mmapEnd += diff;
return start;
} else {
if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
@ -895,7 +897,7 @@ mremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc)
return -ENOMEM;
} else {
uint64_t new_start = use_provided_address ?
provided_address : process->mmap_end;
provided_address : process->memState->mmapEnd;
process->pTable->remap(start, old_length, new_start);
warn("mremapping to new vaddr %08p-%08p, adding %d\n",
new_start, new_start + new_length,
@ -905,9 +907,9 @@ mremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc)
new_length - old_length,
use_provided_address /* clobber */);
if (!use_provided_address)
process->mmap_end += new_length;
process->memState->mmapEnd += new_length;
if (use_provided_address &&
new_start + new_length > process->mmap_end) {
new_start + new_length > process->memState->mmapEnd) {
// something fishy going on here, at least notify the user
// @todo: increase mmap_end?
warn("mmap region limit exceeded with MREMAP_FIXED\n");
@ -1179,6 +1181,132 @@ statfsFunc(SyscallDesc *desc, int callnum, Process *process,
return 0;
}
template <class OS>
SyscallReturn
cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
{
int index = 0;
TheISA::IntReg flags = p->getSyscallArg(tc, index);
TheISA::IntReg newStack = p->getSyscallArg(tc, index);
Addr ptidPtr = p->getSyscallArg(tc, index);
Addr ctidPtr = p->getSyscallArg(tc, index);
Addr tlsPtr M5_VAR_USED = p->getSyscallArg(tc, index);
if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) ||
((flags & OS::TGT_CLONE_THREAD) && !(flags & OS::TGT_CLONE_SIGHAND)) ||
((flags & OS::TGT_CLONE_FS) && (flags & OS::TGT_CLONE_NEWNS)) ||
((flags & OS::TGT_CLONE_NEWIPC) && (flags & OS::TGT_CLONE_SYSVSEM)) ||
((flags & OS::TGT_CLONE_NEWPID) && (flags & OS::TGT_CLONE_THREAD)) ||
((flags & OS::TGT_CLONE_VM) && !(newStack)))
return -EINVAL;
ThreadContext *ctc;
if (!(ctc = p->findFreeContext()))
fatal("clone: no spare thread context in system");
/**
* Note that ProcessParams is generated by swig and there are no other
* examples of how to create anything but this default constructor. The
* fields are manually initialized instead of passing parameters to the
* constructor.
*/
ProcessParams *pp = new ProcessParams();
pp->executable.assign(*(new std::string(p->progName())));
pp->cmd.push_back(*(new std::string(p->progName())));
pp->system = p->system;
pp->maxStackSize = p->maxStackSize;
pp->cwd.assign(p->getcwd());
pp->input.assign("stdin");
pp->output.assign("stdout");
pp->errout.assign("stderr");
pp->uid = p->uid();
pp->euid = p->euid();
pp->gid = p->gid();
pp->egid = p->egid();
/* Find the first free PID that's less than the maximum */
std::set<int> const& pids = p->system->PIDs;
int temp_pid = *pids.begin();
do {
temp_pid++;
} while (pids.find(temp_pid) != pids.end());
if (temp_pid >= System::maxPID)
fatal("temp_pid is too large: %d", temp_pid);
pp->pid = temp_pid;
pp->ppid = (flags & OS::TGT_CLONE_THREAD) ? p->ppid() : p->pid();
Process *cp = pp->create();
delete pp;
Process *owner = ctc->getProcessPtr();
ctc->setProcessPtr(cp);
cp->assignThreadContext(ctc->contextId());
owner->revokeThreadContext(ctc->contextId());
if (flags & OS::TGT_CLONE_PARENT_SETTID) {
BufferArg ptidBuf(ptidPtr, sizeof(long));
long *ptid = (long *)ptidBuf.bufferPtr();
*ptid = cp->pid();
ptidBuf.copyOut(tc->getMemProxy());
}
cp->initState();
p->clone(tc, ctc, cp, flags);
if (flags & OS::TGT_CLONE_CHILD_SETTID) {
BufferArg ctidBuf(ctidPtr, sizeof(long));
long *ctid = (long *)ctidBuf.bufferPtr();
*ctid = cp->pid();
ctidBuf.copyOut(ctc->getMemProxy());
}
if (flags & OS::TGT_CLONE_CHILD_CLEARTID)
cp->childClearTID = (uint64_t)ctidPtr;
ctc->clearArchRegs();
#if THE_ISA == ALPHA_ISA
TheISA::copyMiscRegs(tc, ctc);
#elif THE_ISA == SPARC_ISA
TheISA::copyRegs(tc, ctc);
ctc->setIntReg(TheISA::NumIntArchRegs + 6, 0);
ctc->setIntReg(TheISA::NumIntArchRegs + 4, 0);
ctc->setIntReg(TheISA::NumIntArchRegs + 3, TheISA::NWindows - 2);
ctc->setIntReg(TheISA::NumIntArchRegs + 5, TheISA::NWindows);
ctc->setMiscReg(TheISA::MISCREG_CWP, 0);
ctc->setIntReg(TheISA::NumIntArchRegs + 7, 0);
ctc->setMiscRegNoEffect(TheISA::MISCREG_TL, 0);
ctc->setMiscReg(TheISA::MISCREG_ASI, TheISA::ASI_PRIMARY);
for (int y = 8; y < 32; y++)
ctc->setIntReg(y, tc->readIntReg(y));
#elif THE_ISA == ARM_ISA or THE_ISA == X86_ISA
TheISA::copyRegs(tc, ctc);
#endif
#if THE_ISA == X86_ISA
if (flags & OS::TGT_CLONE_SETTLS) {
ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_BASE, tlsPtr);
ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_EFF_BASE, tlsPtr);
}
#endif
if (newStack)
ctc->setIntReg(TheISA::StackPointerReg, newStack);
cp->setSyscallReturn(ctc, 0);
#if THE_ISA == ALPHA_ISA
ctc->setIntReg(TheISA::SyscallSuccessReg, 0);
#elif THE_ISA == SPARC_ISA
tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0);
ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1);
#endif
ctc->pcState(tc->nextInstAddr());
ctc->activate();
return cp->pid();
}
/// Target fstatfs() handler.
template <class OS>
@ -1329,8 +1457,9 @@ mmapImpl(SyscallDesc *desc, int num, Process *p, ThreadContext *tc,
// Extend global mmap region if necessary. Note that we ignore the
// start address unless MAP_FIXED is specified.
if (!(tgt_flags & OS::TGT_MAP_FIXED)) {
start = p->mmapGrowsDown() ? p->mmap_end - length : p->mmap_end;
p->mmap_end = p->mmapGrowsDown() ? start : p->mmap_end + length;
Addr *end = &p->memState->mmapEnd;
start = p->mmapGrowsDown() ? *end - length : *end;
*end = p->mmapGrowsDown() ? start : *end + length;
}
DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n",
@ -1584,6 +1713,100 @@ utimesFunc(SyscallDesc *desc, int callnum, Process *process,
return 0;
}
template <class OS>
SyscallReturn
execveFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
{
desc->setFlags(0);
int index = 0;
std::string path;
SETranslatingPortProxy & mem_proxy = tc->getMemProxy();
if (!mem_proxy.tryReadString(path, p->getSyscallArg(tc, index)))
return -EFAULT;
if (access(path.c_str(), F_OK) == -1)
return -EACCES;
auto read_in = [](std::vector<std::string> & vect,
SETranslatingPortProxy & mem_proxy,
Addr mem_loc)
{
for (int inc = 0; ; inc++) {
BufferArg b((mem_loc + sizeof(Addr) * inc), sizeof(Addr));
b.copyIn(mem_proxy);
if (!*(Addr*)b.bufferPtr())
break;
vect.push_back(std::string());
mem_proxy.tryReadString(vect[inc], *(Addr*)b.bufferPtr());
}
};
/**
* Note that ProcessParams is generated by swig and there are no other
* examples of how to create anything but this default constructor. The
* fields are manually initialized instead of passing parameters to the
* constructor.
*/
ProcessParams *pp = new ProcessParams();
pp->executable = path;
Addr argv_mem_loc = p->getSyscallArg(tc, index);
read_in(pp->cmd, mem_proxy, argv_mem_loc);
Addr envp_mem_loc = p->getSyscallArg(tc, index);
read_in(pp->env, mem_proxy, envp_mem_loc);
pp->uid = p->uid();
pp->egid = p->egid();
pp->euid = p->euid();
pp->gid = p->gid();
pp->ppid = p->ppid();
pp->pid = p->pid();
pp->input.assign("cin");
pp->output.assign("cout");
pp->errout.assign("cerr");
pp->cwd.assign(p->getcwd());
pp->system = p->system;
pp->maxStackSize = p->maxStackSize;
/**
* Prevent process object creation with identical PIDs (which will trip
* a fatal check in Process constructor). The execve call is supposed to
* take over the currently executing process' identity but replace
* whatever it is doing with a new process image. Instead of hijacking
* the process object in the simulator, we create a new process object
* and bind to the previous process' thread below (hijacking the thread).
*/
p->system->PIDs.erase(p->pid());
Process *new_p = pp->create();
delete pp;
/**
* Work through the file descriptor array and close any files marked
* close-on-exec.
*/
new_p->fds = p->fds;
for (int i = 0; i < new_p->fds->getSize(); i++) {
std::shared_ptr<FDEntry> fdep = (*new_p->fds)[i];
if (fdep && fdep->getCOE())
new_p->fds->closeFDEntry(i);
}
*new_p->sigchld = true;
delete p;
tc->clearArchRegs();
tc->setProcessPtr(new_p);
new_p->assignThreadContext(tc->contextId());
new_p->initState();
tc->activate();
TheISA::PCState pcState = tc->pcState();
tc->setNPC(pcState.instAddr());
desc->setFlags(SyscallDesc::SuppressReturnValue);
return 0;
}
/// Target getrusage() function.
template <class OS>
SyscallReturn