1575 lines
56 KiB
Rust
1575 lines
56 KiB
Rust
use alloc::sync::Arc;
|
|
use alloc::boxed::Box;
|
|
use alloc::vec::Vec;
|
|
use core::alloc::{GlobalAlloc, Layout};
|
|
use core::{intrinsics, mem};
|
|
use core::ops::DerefMut;
|
|
use spin::Mutex;
|
|
|
|
use memory::allocate_frames;
|
|
use paging::{ActivePageTable, InactivePageTable, Page, VirtualAddress, PAGE_SIZE};
|
|
use paging::entry::EntryFlags;
|
|
use paging::mapper::MapperFlushAll;
|
|
use paging::temporary_page::TemporaryPage;
|
|
use start::usermode;
|
|
use interrupt;
|
|
use context;
|
|
use context::{ContextId, WaitpidKey};
|
|
use context::file::FileDescriptor;
|
|
#[cfg(not(feature="doc"))]
|
|
use elf::{self, program_header};
|
|
use ipi::{ipi, IpiKind, IpiTarget};
|
|
use scheme::FileHandle;
|
|
use syscall;
|
|
use syscall::data::{SigAction, Stat};
|
|
use syscall::error::*;
|
|
use syscall::flag::{CLONE_VFORK, CLONE_VM, CLONE_FS, CLONE_FILES, CLONE_SIGHAND, CLONE_STACK,
|
|
PROT_EXEC, PROT_READ, PROT_WRITE,
|
|
SIG_DFL, SIG_BLOCK, SIG_UNBLOCK, SIG_SETMASK, SIGCONT, SIGTERM,
|
|
WCONTINUED, WNOHANG, WUNTRACED, wifcontinued, wifstopped};
|
|
use syscall::validate::{validate_slice, validate_slice_mut};
|
|
|
|
pub fn brk(address: usize) -> Result<usize> {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
|
|
//println!("{}: {}: BRK {:X}", unsafe { ::core::str::from_utf8_unchecked(&context.name.lock()) },
|
|
// context.id.into(), address);
|
|
|
|
let current = if let Some(ref heap_shared) = context.heap {
|
|
heap_shared.with(|heap| {
|
|
heap.start_address().get() + heap.size()
|
|
})
|
|
} else {
|
|
panic!("user heap not initialized");
|
|
};
|
|
|
|
if address == 0 {
|
|
//println!("Brk query {:X}", current);
|
|
Ok(current)
|
|
} else if address >= ::USER_HEAP_OFFSET {
|
|
//TODO: out of memory errors
|
|
if let Some(ref heap_shared) = context.heap {
|
|
heap_shared.with(|heap| {
|
|
heap.resize(address - ::USER_HEAP_OFFSET, true);
|
|
});
|
|
} else {
|
|
panic!("user heap not initialized");
|
|
}
|
|
|
|
//println!("Brk resize {:X}", address);
|
|
Ok(address)
|
|
} else {
|
|
//println!("Brk no mem");
|
|
Err(Error::new(ENOMEM))
|
|
}
|
|
}
|
|
|
|
pub fn clone(flags: usize, stack_base: usize) -> Result<ContextId> {
|
|
let ppid;
|
|
let pid;
|
|
{
|
|
let pgid;
|
|
let ruid;
|
|
let rgid;
|
|
let rns;
|
|
let euid;
|
|
let egid;
|
|
let ens;
|
|
let umask;
|
|
let sigmask;
|
|
let mut cpu_id = None;
|
|
let arch;
|
|
let vfork;
|
|
let mut kfx_option = None;
|
|
let mut kstack_option = None;
|
|
let mut offset = 0;
|
|
let mut image = vec![];
|
|
let mut heap_option = None;
|
|
let mut stack_option = None;
|
|
let mut sigstack_option = None;
|
|
let mut tls_option = None;
|
|
let grants;
|
|
let name;
|
|
let cwd;
|
|
let files;
|
|
let actions;
|
|
|
|
// Copy from old process
|
|
{
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
|
|
ppid = context.id;
|
|
pgid = context.pgid;
|
|
ruid = context.ruid;
|
|
rgid = context.rgid;
|
|
rns = context.rns;
|
|
euid = context.euid;
|
|
egid = context.egid;
|
|
ens = context.ens;
|
|
sigmask = context.sigmask;
|
|
umask = context.umask;
|
|
|
|
if flags & CLONE_VM == CLONE_VM {
|
|
cpu_id = context.cpu_id;
|
|
}
|
|
|
|
arch = context.arch.clone();
|
|
|
|
if let Some(ref fx) = context.kfx {
|
|
let mut new_fx = unsafe { Box::from_raw(::ALLOCATOR.alloc(Layout::from_size_align_unchecked(512, 16)) as *mut [u8; 512]) };
|
|
for (new_b, b) in new_fx.iter_mut().zip(fx.iter()) {
|
|
*new_b = *b;
|
|
}
|
|
kfx_option = Some(new_fx);
|
|
}
|
|
|
|
if let Some(ref stack) = context.kstack {
|
|
offset = stack_base - stack.as_ptr() as usize - mem::size_of::<usize>(); // Add clone ret
|
|
let mut new_stack = stack.clone();
|
|
|
|
unsafe {
|
|
let func_ptr = new_stack.as_mut_ptr().offset(offset as isize);
|
|
*(func_ptr as *mut usize) = interrupt::syscall::clone_ret as usize;
|
|
}
|
|
|
|
kstack_option = Some(new_stack);
|
|
}
|
|
|
|
if flags & CLONE_VM == CLONE_VM {
|
|
for memory_shared in context.image.iter() {
|
|
image.push(memory_shared.clone());
|
|
}
|
|
|
|
if let Some(ref heap_shared) = context.heap {
|
|
heap_option = Some(heap_shared.clone());
|
|
}
|
|
} else {
|
|
for memory_shared in context.image.iter() {
|
|
memory_shared.with(|memory| {
|
|
let mut new_memory = context::memory::Memory::new(
|
|
VirtualAddress::new(memory.start_address().get() + ::USER_TMP_OFFSET),
|
|
memory.size(),
|
|
EntryFlags::PRESENT | EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE,
|
|
false
|
|
);
|
|
|
|
unsafe {
|
|
intrinsics::copy(memory.start_address().get() as *const u8,
|
|
new_memory.start_address().get() as *mut u8,
|
|
memory.size());
|
|
}
|
|
|
|
new_memory.remap(memory.flags());
|
|
image.push(new_memory.to_shared());
|
|
});
|
|
}
|
|
|
|
if let Some(ref heap_shared) = context.heap {
|
|
heap_shared.with(|heap| {
|
|
let mut new_heap = context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_TMP_HEAP_OFFSET),
|
|
heap.size(),
|
|
EntryFlags::PRESENT | EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE,
|
|
false
|
|
);
|
|
|
|
unsafe {
|
|
intrinsics::copy(heap.start_address().get() as *const u8,
|
|
new_heap.start_address().get() as *mut u8,
|
|
heap.size());
|
|
}
|
|
|
|
new_heap.remap(heap.flags());
|
|
heap_option = Some(new_heap.to_shared());
|
|
});
|
|
}
|
|
}
|
|
|
|
if let Some(ref stack_shared) = context.stack {
|
|
if flags & CLONE_STACK == CLONE_STACK {
|
|
stack_option = Some(stack_shared.clone());
|
|
} else {
|
|
stack_shared.with(|stack| {
|
|
let mut new_stack = context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_TMP_STACK_OFFSET),
|
|
stack.size(),
|
|
EntryFlags::PRESENT | EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE,
|
|
false
|
|
);
|
|
|
|
unsafe {
|
|
intrinsics::copy(stack.start_address().get() as *const u8,
|
|
new_stack.start_address().get() as *mut u8,
|
|
stack.size());
|
|
}
|
|
|
|
new_stack.remap(stack.flags());
|
|
stack_option = Some(new_stack.to_shared());
|
|
});
|
|
}
|
|
}
|
|
|
|
if let Some(ref sigstack) = context.sigstack {
|
|
let mut new_sigstack = context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_TMP_SIGSTACK_OFFSET),
|
|
sigstack.size(),
|
|
EntryFlags::PRESENT | EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE,
|
|
false
|
|
);
|
|
|
|
unsafe {
|
|
intrinsics::copy(sigstack.start_address().get() as *const u8,
|
|
new_sigstack.start_address().get() as *mut u8,
|
|
sigstack.size());
|
|
}
|
|
|
|
new_sigstack.remap(sigstack.flags());
|
|
sigstack_option = Some(new_sigstack);
|
|
}
|
|
|
|
if let Some(ref tls) = context.tls {
|
|
let mut new_tls = context::memory::Tls {
|
|
master: tls.master,
|
|
file_size: tls.file_size,
|
|
mem: context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_TMP_TLS_OFFSET),
|
|
tls.mem.size(),
|
|
EntryFlags::PRESENT | EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE,
|
|
true
|
|
),
|
|
offset: tls.offset,
|
|
};
|
|
|
|
|
|
if flags & CLONE_VM == CLONE_VM {
|
|
unsafe {
|
|
new_tls.load();
|
|
}
|
|
} else {
|
|
unsafe {
|
|
intrinsics::copy(tls.mem.start_address().get() as *const u8,
|
|
new_tls.mem.start_address().get() as *mut u8,
|
|
tls.mem.size());
|
|
}
|
|
}
|
|
|
|
new_tls.mem.remap(tls.mem.flags());
|
|
tls_option = Some(new_tls);
|
|
}
|
|
|
|
if flags & CLONE_VM == CLONE_VM {
|
|
grants = Arc::clone(&context.grants);
|
|
} else {
|
|
let mut grants_vec = Vec::new();
|
|
for grant in context.grants.lock().iter() {
|
|
let start = VirtualAddress::new(grant.start_address().get() + ::USER_TMP_GRANT_OFFSET - ::USER_GRANT_OFFSET);
|
|
grants_vec.push(grant.secret_clone(start));
|
|
}
|
|
grants = Arc::new(Mutex::new(grants_vec));
|
|
}
|
|
|
|
if flags & CLONE_VM == CLONE_VM {
|
|
name = Arc::clone(&context.name);
|
|
} else {
|
|
name = Arc::new(Mutex::new(context.name.lock().clone()));
|
|
}
|
|
|
|
if flags & CLONE_FS == CLONE_FS {
|
|
cwd = Arc::clone(&context.cwd);
|
|
} else {
|
|
cwd = Arc::new(Mutex::new(context.cwd.lock().clone()));
|
|
}
|
|
|
|
if flags & CLONE_FILES == CLONE_FILES {
|
|
files = Arc::clone(&context.files);
|
|
} else {
|
|
files = Arc::new(Mutex::new(context.files.lock().clone()));
|
|
}
|
|
|
|
if flags & CLONE_SIGHAND == CLONE_SIGHAND {
|
|
actions = Arc::clone(&context.actions);
|
|
} else {
|
|
actions = Arc::new(Mutex::new(context.actions.lock().clone()));
|
|
}
|
|
}
|
|
|
|
// If not cloning files, dup to get a new number from scheme
|
|
// This has to be done outside the context lock to prevent deadlocks
|
|
if flags & CLONE_FILES == 0 {
|
|
for (_fd, file_option) in files.lock().iter_mut().enumerate() {
|
|
let new_file_option = if let Some(ref file) = *file_option {
|
|
Some(FileDescriptor {
|
|
description: Arc::clone(&file.description),
|
|
cloexec: file.cloexec,
|
|
})
|
|
} else {
|
|
None
|
|
};
|
|
|
|
*file_option = new_file_option;
|
|
}
|
|
}
|
|
|
|
// If not cloning virtual memory, use fmap to re-obtain every grant where possible
|
|
if flags & CLONE_VM == 0 {
|
|
let mut i = 0;
|
|
while i < grants.lock().len() {
|
|
let mut remove = false;
|
|
if let Some(grant) = grants.lock().get(i) {
|
|
if let Some(ref _desc) = grant.desc_opt {
|
|
println!("todo: clone grant {} using fmap: {:?}", i, grant);
|
|
}
|
|
}
|
|
if remove {
|
|
grants.lock().remove(i);
|
|
} else {
|
|
i += 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If vfork, block the current process
|
|
// This has to be done after the operations that may require context switches
|
|
if flags & CLONE_VFORK == CLONE_VFORK {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let mut context = context_lock.write();
|
|
context.block();
|
|
vfork = true;
|
|
} else {
|
|
vfork = false;
|
|
}
|
|
|
|
// Set up new process
|
|
{
|
|
let mut contexts = context::contexts_mut();
|
|
let context_lock = contexts.new_context()?;
|
|
let mut context = context_lock.write();
|
|
|
|
pid = context.id;
|
|
|
|
context.pgid = pgid;
|
|
context.ppid = ppid;
|
|
context.ruid = ruid;
|
|
context.rgid = rgid;
|
|
context.rns = rns;
|
|
context.euid = euid;
|
|
context.egid = egid;
|
|
context.ens = ens;
|
|
context.sigmask = sigmask;
|
|
context.umask = umask;
|
|
|
|
context.cpu_id = cpu_id;
|
|
|
|
context.status = context::Status::Runnable;
|
|
|
|
context.vfork = vfork;
|
|
|
|
context.arch = arch;
|
|
|
|
let mut active_table = unsafe { ActivePageTable::new() };
|
|
|
|
let mut temporary_page = TemporaryPage::new(Page::containing_address(VirtualAddress::new(::USER_TMP_MISC_OFFSET)));
|
|
|
|
let mut new_table = {
|
|
let frame = allocate_frames(1).expect("no more frames in syscall::clone new_table");
|
|
InactivePageTable::new(frame, &mut active_table, &mut temporary_page)
|
|
};
|
|
|
|
context.arch.set_page_table(unsafe { new_table.address() });
|
|
|
|
// Copy kernel image mapping
|
|
{
|
|
let frame = active_table.p4()[::KERNEL_PML4].pointed_frame().expect("kernel image not mapped");
|
|
let flags = active_table.p4()[::KERNEL_PML4].flags();
|
|
active_table.with(&mut new_table, &mut temporary_page, |mapper| {
|
|
mapper.p4_mut()[::KERNEL_PML4].set(frame, flags);
|
|
});
|
|
}
|
|
|
|
// Copy kernel heap mapping
|
|
{
|
|
let frame = active_table.p4()[::KERNEL_HEAP_PML4].pointed_frame().expect("kernel heap not mapped");
|
|
let flags = active_table.p4()[::KERNEL_HEAP_PML4].flags();
|
|
active_table.with(&mut new_table, &mut temporary_page, |mapper| {
|
|
mapper.p4_mut()[::KERNEL_HEAP_PML4].set(frame, flags);
|
|
});
|
|
}
|
|
|
|
if let Some(fx) = kfx_option.take() {
|
|
context.arch.set_fx(fx.as_ptr() as usize);
|
|
context.kfx = Some(fx);
|
|
}
|
|
|
|
// Set kernel stack
|
|
if let Some(stack) = kstack_option.take() {
|
|
context.arch.set_stack(stack.as_ptr() as usize + offset);
|
|
context.kstack = Some(stack);
|
|
}
|
|
|
|
// TODO: Clone ksig?
|
|
|
|
// Setup image, heap, and grants
|
|
if flags & CLONE_VM == CLONE_VM {
|
|
// Copy user image mapping, if found
|
|
if ! image.is_empty() {
|
|
let frame = active_table.p4()[::USER_PML4].pointed_frame().expect("user image not mapped");
|
|
let flags = active_table.p4()[::USER_PML4].flags();
|
|
active_table.with(&mut new_table, &mut temporary_page, |mapper| {
|
|
mapper.p4_mut()[::USER_PML4].set(frame, flags);
|
|
});
|
|
}
|
|
context.image = image;
|
|
|
|
// Copy user heap mapping, if found
|
|
if let Some(heap_shared) = heap_option {
|
|
let frame = active_table.p4()[::USER_HEAP_PML4].pointed_frame().expect("user heap not mapped");
|
|
let flags = active_table.p4()[::USER_HEAP_PML4].flags();
|
|
active_table.with(&mut new_table, &mut temporary_page, |mapper| {
|
|
mapper.p4_mut()[::USER_HEAP_PML4].set(frame, flags);
|
|
});
|
|
context.heap = Some(heap_shared);
|
|
}
|
|
|
|
// Copy grant mapping
|
|
if ! grants.lock().is_empty() {
|
|
let frame = active_table.p4()[::USER_GRANT_PML4].pointed_frame().expect("user grants not mapped");
|
|
let flags = active_table.p4()[::USER_GRANT_PML4].flags();
|
|
active_table.with(&mut new_table, &mut temporary_page, |mapper| {
|
|
mapper.p4_mut()[::USER_GRANT_PML4].set(frame, flags);
|
|
});
|
|
}
|
|
context.grants = grants;
|
|
} else {
|
|
// Copy percpu mapping
|
|
for cpu_id in 0..::cpu_count() {
|
|
extern {
|
|
// The starting byte of the thread data segment
|
|
static mut __tdata_start: u8;
|
|
// The ending byte of the thread BSS segment
|
|
static mut __tbss_end: u8;
|
|
}
|
|
|
|
let size = unsafe { & __tbss_end as *const _ as usize - & __tdata_start as *const _ as usize };
|
|
|
|
let start = ::KERNEL_PERCPU_OFFSET + ::KERNEL_PERCPU_SIZE * cpu_id;
|
|
let end = start + size;
|
|
|
|
let start_page = Page::containing_address(VirtualAddress::new(start));
|
|
let end_page = Page::containing_address(VirtualAddress::new(end - 1));
|
|
for page in Page::range_inclusive(start_page, end_page) {
|
|
let frame = active_table.translate_page(page).expect("kernel percpu not mapped");
|
|
active_table.with(&mut new_table, &mut temporary_page, |mapper| {
|
|
let result = mapper.map_to(page, frame, EntryFlags::PRESENT | EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE);
|
|
// Ignore result due to operating on inactive table
|
|
unsafe { result.ignore(); }
|
|
});
|
|
}
|
|
}
|
|
|
|
// Move copy of image
|
|
for memory_shared in image.iter_mut() {
|
|
memory_shared.with(|memory| {
|
|
let start = VirtualAddress::new(memory.start_address().get() - ::USER_TMP_OFFSET + ::USER_OFFSET);
|
|
memory.move_to(start, &mut new_table, &mut temporary_page);
|
|
});
|
|
}
|
|
context.image = image;
|
|
|
|
// Move copy of heap
|
|
if let Some(heap_shared) = heap_option {
|
|
heap_shared.with(|heap| {
|
|
heap.move_to(VirtualAddress::new(::USER_HEAP_OFFSET), &mut new_table, &mut temporary_page);
|
|
});
|
|
context.heap = Some(heap_shared);
|
|
}
|
|
|
|
// Move grants
|
|
for grant in grants.lock().iter_mut() {
|
|
let start = VirtualAddress::new(grant.start_address().get() + ::USER_GRANT_OFFSET - ::USER_TMP_GRANT_OFFSET);
|
|
grant.move_to(start, &mut new_table, &mut temporary_page);
|
|
}
|
|
context.grants = grants;
|
|
}
|
|
|
|
// Setup user stack
|
|
if let Some(stack_shared) = stack_option {
|
|
if flags & CLONE_STACK == CLONE_STACK {
|
|
let frame = active_table.p4()[::USER_STACK_PML4].pointed_frame().expect("user stack not mapped");
|
|
let flags = active_table.p4()[::USER_STACK_PML4].flags();
|
|
active_table.with(&mut new_table, &mut temporary_page, |mapper| {
|
|
mapper.p4_mut()[::USER_STACK_PML4].set(frame, flags);
|
|
});
|
|
} else {
|
|
stack_shared.with(|stack| {
|
|
stack.move_to(VirtualAddress::new(::USER_STACK_OFFSET), &mut new_table, &mut temporary_page);
|
|
});
|
|
}
|
|
context.stack = Some(stack_shared);
|
|
}
|
|
|
|
// Setup user sigstack
|
|
if let Some(mut sigstack) = sigstack_option {
|
|
sigstack.move_to(VirtualAddress::new(::USER_SIGSTACK_OFFSET), &mut new_table, &mut temporary_page);
|
|
context.sigstack = Some(sigstack);
|
|
}
|
|
|
|
// Set up TCB
|
|
let tcb_addr = ::USER_TCB_OFFSET + context.id.into() * PAGE_SIZE;
|
|
let mut tcb = context::memory::Memory::new(
|
|
VirtualAddress::new(tcb_addr),
|
|
PAGE_SIZE,
|
|
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE | EntryFlags::USER_ACCESSIBLE,
|
|
true
|
|
);
|
|
|
|
// Setup user TLS
|
|
if let Some(mut tls) = tls_option {
|
|
tls.mem.move_to(VirtualAddress::new(::USER_TLS_OFFSET), &mut new_table, &mut temporary_page);
|
|
unsafe {
|
|
*(tcb_addr as *mut usize) = tls.mem.start_address().get() + tls.mem.size();
|
|
}
|
|
context.tls = Some(tls);
|
|
} else {
|
|
let parent_tcb_addr = ::USER_TCB_OFFSET + ppid.into() * PAGE_SIZE;
|
|
unsafe {
|
|
intrinsics::copy(parent_tcb_addr as *const u8,
|
|
tcb_addr as *mut u8,
|
|
tcb.size());
|
|
}
|
|
}
|
|
|
|
tcb.move_to(VirtualAddress::new(tcb_addr), &mut new_table, &mut temporary_page);
|
|
context.image.push(tcb.to_shared());
|
|
|
|
context.name = name;
|
|
|
|
context.cwd = cwd;
|
|
|
|
context.files = files;
|
|
|
|
context.actions = actions;
|
|
}
|
|
}
|
|
|
|
// Race to pick up the new process!
|
|
ipi(IpiKind::Switch, IpiTarget::Other);
|
|
|
|
let _ = unsafe { context::switch() };
|
|
|
|
Ok(pid)
|
|
}
|
|
|
|
fn empty(context: &mut context::Context, reaping: bool) {
|
|
if reaping {
|
|
// Memory should already be unmapped
|
|
assert!(context.image.is_empty());
|
|
assert!(context.heap.is_none());
|
|
assert!(context.stack.is_none());
|
|
assert!(context.sigstack.is_none());
|
|
assert!(context.tls.is_none());
|
|
} else {
|
|
// Unmap previous image, heap, grants, stack, and tls
|
|
context.image.clear();
|
|
drop(context.heap.take());
|
|
drop(context.stack.take());
|
|
drop(context.sigstack.take());
|
|
drop(context.tls.take());
|
|
}
|
|
|
|
let mut grants = context.grants.lock();
|
|
if Arc::strong_count(&context.grants) == 1 {
|
|
for grant in grants.drain(..) {
|
|
if reaping {
|
|
println!("{}: {}: Grant should not exist: {:?}", context.id.into(), unsafe { ::core::str::from_utf8_unchecked(&context.name.lock()) }, grant);
|
|
|
|
let mut new_table = unsafe { InactivePageTable::from_address(context.arch.get_page_table()) };
|
|
let mut temporary_page = TemporaryPage::new(Page::containing_address(VirtualAddress::new(::USER_TMP_GRANT_OFFSET)));
|
|
|
|
grant.unmap_inactive(&mut new_table, &mut temporary_page);
|
|
} else {
|
|
grant.unmap();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
struct ExecFile(FileHandle);
|
|
|
|
impl Drop for ExecFile {
|
|
fn drop(&mut self) {
|
|
let _ = syscall::close(self.0);
|
|
}
|
|
}
|
|
|
|
fn fexec_noreturn(
|
|
setuid: Option<u32>,
|
|
setgid: Option<u32>,
|
|
name: Box<[u8]>,
|
|
data: Box<[u8]>,
|
|
args: Box<[Box<[u8]>]>,
|
|
vars: Box<[Box<[u8]>]>
|
|
) -> ! {
|
|
let entry;
|
|
let mut sp = ::USER_STACK_OFFSET + ::USER_STACK_SIZE - 256;
|
|
|
|
{
|
|
let (vfork, ppid, files) = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH)).expect("exec_noreturn pid not found");
|
|
let mut context = context_lock.write();
|
|
|
|
context.name = Arc::new(Mutex::new(name));
|
|
|
|
empty(&mut context, false);
|
|
|
|
if let Some(uid) = setuid {
|
|
context.euid = uid;
|
|
}
|
|
|
|
if let Some(gid) = setgid {
|
|
context.egid = gid;
|
|
}
|
|
|
|
// Map and copy new segments
|
|
let mut tls_option = None;
|
|
{
|
|
let elf = elf::Elf::from(&data).unwrap();
|
|
entry = elf.entry();
|
|
|
|
// Always map TCB
|
|
let tcb_addr = ::USER_TCB_OFFSET + context.id.into() * PAGE_SIZE;
|
|
let tcb_mem = context::memory::Memory::new(
|
|
VirtualAddress::new(tcb_addr),
|
|
PAGE_SIZE,
|
|
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE | EntryFlags::USER_ACCESSIBLE,
|
|
true
|
|
);
|
|
|
|
for segment in elf.segments() {
|
|
match segment.p_type {
|
|
program_header::PT_LOAD => {
|
|
let voff = segment.p_vaddr as usize % PAGE_SIZE;
|
|
let vaddr = segment.p_vaddr as usize - voff;
|
|
|
|
let mut memory = context::memory::Memory::new(
|
|
VirtualAddress::new(vaddr),
|
|
segment.p_memsz as usize + voff,
|
|
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE,
|
|
true
|
|
);
|
|
|
|
unsafe {
|
|
// Copy file data
|
|
intrinsics::copy((elf.data.as_ptr() as usize + segment.p_offset as usize) as *const u8,
|
|
segment.p_vaddr as *mut u8,
|
|
segment.p_filesz as usize);
|
|
}
|
|
|
|
let mut flags = EntryFlags::NO_EXECUTE | EntryFlags::USER_ACCESSIBLE;
|
|
|
|
if segment.p_flags & program_header::PF_R == program_header::PF_R {
|
|
flags.insert(EntryFlags::PRESENT);
|
|
}
|
|
|
|
// W ^ X. If it is executable, do not allow it to be writable, even if requested
|
|
if segment.p_flags & program_header::PF_X == program_header::PF_X {
|
|
flags.remove(EntryFlags::NO_EXECUTE);
|
|
} else if segment.p_flags & program_header::PF_W == program_header::PF_W {
|
|
flags.insert(EntryFlags::WRITABLE);
|
|
}
|
|
|
|
memory.remap(flags);
|
|
|
|
context.image.push(memory.to_shared());
|
|
},
|
|
program_header::PT_TLS => {
|
|
let aligned_size = if segment.p_align > 0 {
|
|
((segment.p_memsz + (segment.p_align - 1))/segment.p_align) * segment.p_align
|
|
} else {
|
|
segment.p_memsz
|
|
} as usize;
|
|
let rounded_size = ((aligned_size + PAGE_SIZE - 1)/PAGE_SIZE) * PAGE_SIZE;
|
|
let rounded_offset = rounded_size - aligned_size;
|
|
|
|
let tls = context::memory::Tls {
|
|
master: VirtualAddress::new(segment.p_vaddr as usize),
|
|
file_size: segment.p_filesz as usize,
|
|
mem: context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_TLS_OFFSET),
|
|
rounded_size as usize,
|
|
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE | EntryFlags::USER_ACCESSIBLE,
|
|
true
|
|
),
|
|
offset: rounded_offset as usize,
|
|
};
|
|
|
|
unsafe {
|
|
*(tcb_addr as *mut usize) = ::USER_TLS_OFFSET + tls.mem.size();
|
|
}
|
|
|
|
tls_option = Some(tls);
|
|
},
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
context.image.push(tcb_mem.to_shared());
|
|
}
|
|
|
|
// Data no longer required, can deallocate
|
|
drop(data);
|
|
|
|
// Map heap
|
|
context.heap = Some(context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_HEAP_OFFSET),
|
|
0,
|
|
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE | EntryFlags::USER_ACCESSIBLE,
|
|
true
|
|
).to_shared());
|
|
|
|
// Map stack
|
|
context.stack = Some(context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_STACK_OFFSET),
|
|
::USER_STACK_SIZE,
|
|
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE | EntryFlags::USER_ACCESSIBLE,
|
|
true
|
|
).to_shared());
|
|
|
|
// Map stack
|
|
context.sigstack = Some(context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_SIGSTACK_OFFSET),
|
|
::USER_SIGSTACK_SIZE,
|
|
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE | EntryFlags::USER_ACCESSIBLE,
|
|
true
|
|
));
|
|
|
|
// Map TLS
|
|
if let Some(mut tls) = tls_option {
|
|
unsafe {
|
|
tls.load();
|
|
}
|
|
|
|
context.tls = Some(tls);
|
|
}
|
|
|
|
let mut arg_size = 0;
|
|
|
|
// Push arguments and variables
|
|
for iter in &[&vars, &args] {
|
|
// Push null-terminator
|
|
sp -= mem::size_of::<usize>();
|
|
unsafe { *(sp as *mut usize) = 0; }
|
|
|
|
// Push content
|
|
for arg in iter.iter().rev() {
|
|
sp -= mem::size_of::<usize>();
|
|
unsafe { *(sp as *mut usize) = ::USER_ARG_OFFSET + arg_size; }
|
|
|
|
arg_size += arg.len() + 1;
|
|
}
|
|
}
|
|
|
|
// Push arguments length
|
|
sp -= mem::size_of::<usize>();
|
|
unsafe { *(sp as *mut usize) = args.len(); }
|
|
|
|
if arg_size > 0 {
|
|
let mut memory = context::memory::Memory::new(
|
|
VirtualAddress::new(::USER_ARG_OFFSET),
|
|
arg_size,
|
|
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE,
|
|
true
|
|
);
|
|
|
|
let mut arg_offset = 0;
|
|
for arg in vars.iter().rev().chain(args.iter().rev()) {
|
|
unsafe {
|
|
intrinsics::copy(arg.as_ptr(),
|
|
(::USER_ARG_OFFSET + arg_offset) as *mut u8,
|
|
arg.len());
|
|
}
|
|
arg_offset += arg.len();
|
|
|
|
unsafe {
|
|
*((::USER_ARG_OFFSET + arg_offset) as *mut u8) = 0;
|
|
}
|
|
arg_offset += 1;
|
|
}
|
|
|
|
memory.remap(EntryFlags::NO_EXECUTE | EntryFlags::USER_ACCESSIBLE);
|
|
|
|
context.image.push(memory.to_shared());
|
|
}
|
|
|
|
// Args no longer required, can deallocate
|
|
drop(args);
|
|
|
|
context.actions = Arc::new(Mutex::new(vec![(
|
|
SigAction {
|
|
sa_handler: unsafe { mem::transmute(SIG_DFL) },
|
|
sa_mask: [0; 2],
|
|
sa_flags: 0,
|
|
},
|
|
0
|
|
); 128]));
|
|
|
|
let vfork = context.vfork;
|
|
context.vfork = false;
|
|
|
|
let files = Arc::clone(&context.files);
|
|
|
|
(vfork, context.ppid, files)
|
|
};
|
|
|
|
for (_fd, file_option) in files.lock().iter_mut().enumerate() {
|
|
let mut cloexec = false;
|
|
if let Some(ref file) = *file_option {
|
|
if file.cloexec {
|
|
cloexec = true;
|
|
}
|
|
}
|
|
|
|
if cloexec {
|
|
let _ = file_option.take().unwrap().close();
|
|
}
|
|
}
|
|
|
|
if vfork {
|
|
let contexts = context::contexts();
|
|
if let Some(context_lock) = contexts.get(ppid) {
|
|
let mut context = context_lock.write();
|
|
if ! context.unblock() {
|
|
println!("{} not blocked for exec vfork unblock", ppid.into());
|
|
}
|
|
} else {
|
|
println!("{} not found for exec vfork unblock", ppid.into());
|
|
}
|
|
}
|
|
}
|
|
|
|
// Go to usermode
|
|
unsafe { usermode(entry, sp, 0); }
|
|
}
|
|
|
|
pub fn fexec_kernel(fd: FileHandle, args: Box<[Box<[u8]>]>, vars: Box<[Box<[u8]>]>, name_override_opt: Option<Box<[u8]>>) -> Result<usize> {
|
|
let (uid, gid) = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
(context.euid, context.egid)
|
|
};
|
|
|
|
let mut stat: Stat;
|
|
let mut name: Vec<u8>;
|
|
let mut data: Vec<u8>;
|
|
{
|
|
let file = ExecFile(fd);
|
|
|
|
stat = Stat::default();
|
|
syscall::file_op_mut_slice(syscall::number::SYS_FSTAT, file.0, &mut stat)?;
|
|
|
|
let mut perm = stat.st_mode & 0o7;
|
|
if stat.st_uid == uid {
|
|
perm |= (stat.st_mode >> 6) & 0o7;
|
|
}
|
|
if stat.st_gid == gid {
|
|
perm |= (stat.st_mode >> 3) & 0o7;
|
|
}
|
|
if uid == 0 {
|
|
perm |= 0o7;
|
|
}
|
|
|
|
if perm & 0o1 != 0o1 {
|
|
return Err(Error::new(EACCES));
|
|
}
|
|
|
|
if let Some(name_override) = name_override_opt {
|
|
name = Vec::from(name_override);
|
|
} else {
|
|
name = vec![0; 4096];
|
|
let len = syscall::file_op_mut_slice(syscall::number::SYS_FPATH, file.0, &mut name)?;
|
|
name.truncate(len);
|
|
}
|
|
|
|
//TODO: Only read elf header, not entire file. Then read required segments
|
|
data = vec![0; stat.st_size as usize];
|
|
syscall::file_op_mut_slice(syscall::number::SYS_READ, file.0, &mut data)?;
|
|
drop(file);
|
|
}
|
|
|
|
// Set UID and GID are determined after resolving any hashbangs
|
|
let setuid = if stat.st_mode & syscall::flag::MODE_SETUID == syscall::flag::MODE_SETUID {
|
|
Some(stat.st_uid)
|
|
} else {
|
|
None
|
|
};
|
|
|
|
let setgid = if stat.st_mode & syscall::flag::MODE_SETGID == syscall::flag::MODE_SETGID {
|
|
Some(stat.st_gid)
|
|
} else {
|
|
None
|
|
};
|
|
|
|
// The argument list is limited to avoid using too much userspace stack
|
|
// This check is done last to allow all hashbangs to be resolved
|
|
//
|
|
// This should be based on the size of the userspace stack, divided
|
|
// by the cost of each argument, which should be usize * 2, with
|
|
// one additional argument added to represent the total size of the
|
|
// argument pointer array and potential padding
|
|
//
|
|
// A limit of 4095 would mean a stack of (4095 + 1) * 8 * 2 = 65536, or 64KB
|
|
if (args.len() + vars.len()) > 4095 {
|
|
return Err(Error::new(E2BIG));
|
|
}
|
|
|
|
match elf::Elf::from(&data) {
|
|
Ok(elf) => {
|
|
// We check the validity of all loadable sections here
|
|
for segment in elf.segments() {
|
|
match segment.p_type {
|
|
program_header::PT_INTERP => {
|
|
//TODO: length restraint, parse interp earlier
|
|
let mut interp = vec![0; segment.p_memsz as usize];
|
|
unsafe {
|
|
intrinsics::copy((elf.data.as_ptr() as usize + segment.p_offset as usize) as *const u8,
|
|
interp.as_mut_ptr(),
|
|
segment.p_filesz as usize);
|
|
}
|
|
|
|
let mut i = 0;
|
|
while i < interp.len() {
|
|
if interp[i] == 0 {
|
|
break;
|
|
}
|
|
i += 1;
|
|
}
|
|
interp.truncate(i);
|
|
|
|
println!(" interpreter: {:?}", ::core::str::from_utf8(&interp));
|
|
|
|
let interp_fd = super::fs::open(&interp, super::flag::O_RDONLY | super::flag::O_CLOEXEC)?;
|
|
|
|
let mut args_vec = Vec::from(args);
|
|
args_vec.insert(0, interp.into_boxed_slice());
|
|
//TODO: pass file handle in auxv
|
|
let name_override = name.into_boxed_slice();
|
|
args_vec[1] = name_override.clone();
|
|
|
|
return fexec_kernel(
|
|
interp_fd,
|
|
args_vec.into_boxed_slice(),
|
|
vars,
|
|
Some(name_override),
|
|
);
|
|
},
|
|
program_header::PT_LOAD => {
|
|
let voff = segment.p_vaddr as usize % PAGE_SIZE;
|
|
let vaddr = segment.p_vaddr as usize - voff;
|
|
|
|
// Due to the Userspace and kernel TLS bases being located right above 2GB,
|
|
// limit any loadable sections to lower than that. Eventually we will need
|
|
// to replace this with a more intelligent TLS address
|
|
if vaddr >= 0x8000_0000 {
|
|
println!("exec: invalid section address {:X}", segment.p_vaddr);
|
|
return Err(Error::new(ENOEXEC));
|
|
}
|
|
},
|
|
_ => (),
|
|
}
|
|
}
|
|
},
|
|
Err(err) => {
|
|
println!("fexec: failed to execute {}: {}", fd.into(), err);
|
|
return Err(Error::new(ENOEXEC));
|
|
}
|
|
}
|
|
|
|
// This is the point of no return, quite literaly. Any checks for validity need
|
|
// to be done before, and appropriate errors returned. Otherwise, we have nothing
|
|
// to return to.
|
|
fexec_noreturn(setuid, setgid, name.into_boxed_slice(), data.into_boxed_slice(), args, vars);
|
|
}
|
|
|
|
pub fn fexec(fd: FileHandle, arg_ptrs: &[[usize; 2]], var_ptrs: &[[usize; 2]]) -> Result<usize> {
|
|
let mut args = Vec::new();
|
|
for arg_ptr in arg_ptrs {
|
|
let arg = validate_slice(arg_ptr[0] as *const u8, arg_ptr[1])?;
|
|
// Argument must be moved into kernel space before exec unmaps all memory
|
|
args.push(arg.to_vec().into_boxed_slice());
|
|
}
|
|
drop(arg_ptrs);
|
|
|
|
let mut vars = Vec::new();
|
|
for var_ptr in var_ptrs {
|
|
let var = validate_slice(var_ptr[0] as *const u8, var_ptr[1])?;
|
|
// Argument must be moved into kernel space before exec unmaps all memory
|
|
vars.push(var.to_vec().into_boxed_slice());
|
|
}
|
|
drop(var_ptrs);
|
|
|
|
fexec_kernel(fd, args.into_boxed_slice(), vars.into_boxed_slice(), None)
|
|
}
|
|
|
|
pub fn exit(status: usize) -> ! {
|
|
{
|
|
let context_lock = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH)).expect("exit failed to find context");
|
|
Arc::clone(&context_lock)
|
|
};
|
|
|
|
let mut close_files = Vec::new();
|
|
let pid = {
|
|
let mut context = context_lock.write();
|
|
{
|
|
let mut lock = context.files.lock();
|
|
if Arc::strong_count(&context.files) == 1 {
|
|
mem::swap(lock.deref_mut(), &mut close_files);
|
|
}
|
|
}
|
|
context.files = Arc::new(Mutex::new(Vec::new()));
|
|
context.id
|
|
};
|
|
|
|
// Files must be closed while context is valid so that messages can be passed
|
|
for (_fd, file_option) in close_files.drain(..).enumerate() {
|
|
if let Some(file) = file_option {
|
|
let _ = file.close();
|
|
}
|
|
}
|
|
|
|
// PGID and PPID must be grabbed after close, as context switches could change PGID or PPID if parent exits
|
|
let (pgid, ppid) = {
|
|
let context = context_lock.read();
|
|
(context.pgid, context.ppid)
|
|
};
|
|
|
|
// Transfer child processes to parent
|
|
{
|
|
let contexts = context::contexts();
|
|
for (_id, context_lock) in contexts.iter() {
|
|
let mut context = context_lock.write();
|
|
if context.ppid == pid {
|
|
context.ppid = ppid;
|
|
context.vfork = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
let (vfork, children) = {
|
|
let mut context = context_lock.write();
|
|
|
|
empty(&mut context, false);
|
|
|
|
let vfork = context.vfork;
|
|
context.vfork = false;
|
|
|
|
context.status = context::Status::Exited(status);
|
|
|
|
let children = context.waitpid.receive_all();
|
|
|
|
(vfork, children)
|
|
};
|
|
|
|
{
|
|
let contexts = context::contexts();
|
|
if let Some(parent_lock) = contexts.get(ppid) {
|
|
let waitpid = {
|
|
let mut parent = parent_lock.write();
|
|
if vfork {
|
|
if ! parent.unblock() {
|
|
println!("{}: {} not blocked for exit vfork unblock", pid.into(), ppid.into());
|
|
}
|
|
}
|
|
Arc::clone(&parent.waitpid)
|
|
};
|
|
|
|
for (c_pid, c_status) in children {
|
|
waitpid.send(c_pid, c_status);
|
|
}
|
|
|
|
waitpid.send(WaitpidKey {
|
|
pid: Some(pid),
|
|
pgid: Some(pgid)
|
|
}, (pid, status));
|
|
} else {
|
|
println!("{}: {} not found for exit vfork unblock", pid.into(), ppid.into());
|
|
}
|
|
}
|
|
|
|
if pid == ContextId::from(1) {
|
|
println!("Main kernel thread exited with status {:X}", status);
|
|
|
|
extern {
|
|
fn kreset() -> !;
|
|
fn kstop() -> !;
|
|
}
|
|
|
|
if status == SIGTERM {
|
|
unsafe { kreset(); }
|
|
} else {
|
|
unsafe { kstop(); }
|
|
}
|
|
}
|
|
}
|
|
|
|
let _ = unsafe { context::switch() };
|
|
|
|
unreachable!();
|
|
}
|
|
|
|
pub fn getpid() -> Result<ContextId> {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
Ok(context.id)
|
|
}
|
|
|
|
pub fn getpgid(pid: ContextId) -> Result<ContextId> {
|
|
let contexts = context::contexts();
|
|
let context_lock = if pid.into() == 0 {
|
|
contexts.current().ok_or(Error::new(ESRCH))?
|
|
} else {
|
|
contexts.get(pid).ok_or(Error::new(ESRCH))?
|
|
};
|
|
let context = context_lock.read();
|
|
Ok(context.pgid)
|
|
}
|
|
|
|
pub fn getppid() -> Result<ContextId> {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
Ok(context.ppid)
|
|
}
|
|
|
|
pub fn kill(pid: ContextId, sig: usize) -> Result<usize> {
|
|
let (ruid, euid, current_pgid) = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
(context.ruid, context.euid, context.pgid)
|
|
};
|
|
|
|
if sig < 0x7F {
|
|
let mut found = 0;
|
|
let mut sent = 0;
|
|
|
|
{
|
|
let contexts = context::contexts();
|
|
|
|
let send = |context: &mut context::Context| -> bool {
|
|
if euid == 0
|
|
|| euid == context.ruid
|
|
|| ruid == context.ruid
|
|
{
|
|
// If sig = 0, test that process exists and can be
|
|
// signalled, but don't send any signal.
|
|
if sig != 0 {
|
|
//TODO: sigprocmask
|
|
context.pending.push_back(sig as u8);
|
|
// Convert stopped processes to blocked if sending SIGCONT
|
|
if sig == SIGCONT {
|
|
if let context::Status::Stopped(_sig) = context.status {
|
|
context.status = context::Status::Blocked;
|
|
}
|
|
}
|
|
}
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
};
|
|
|
|
if pid.into() as isize > 0 {
|
|
// Send to a single process
|
|
if let Some(context_lock) = contexts.get(pid) {
|
|
let mut context = context_lock.write();
|
|
|
|
found += 1;
|
|
if send(&mut context) {
|
|
sent += 1;
|
|
}
|
|
}
|
|
} else if pid.into() as isize == -1 {
|
|
// Send to every process with permission, except for init
|
|
for (_id, context_lock) in contexts.iter() {
|
|
let mut context = context_lock.write();
|
|
|
|
if context.id.into() > 2 {
|
|
found += 1;
|
|
|
|
if send(&mut context) {
|
|
sent += 1;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
let pgid = if pid.into() == 0 {
|
|
current_pgid
|
|
} else {
|
|
ContextId::from(-(pid.into() as isize) as usize)
|
|
};
|
|
|
|
// Send to every process in the process group whose ID
|
|
for (_id, context_lock) in contexts.iter() {
|
|
let mut context = context_lock.write();
|
|
|
|
if context.pgid == pgid {
|
|
found += 1;
|
|
|
|
if send(&mut context) {
|
|
sent += 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if found == 0 {
|
|
Err(Error::new(ESRCH))
|
|
} else if sent == 0 {
|
|
Err(Error::new(EPERM))
|
|
} else {
|
|
// Switch to ensure delivery to self
|
|
unsafe { context::switch(); }
|
|
|
|
Ok(0)
|
|
}
|
|
} else {
|
|
Err(Error::new(EINVAL))
|
|
}
|
|
}
|
|
|
|
pub fn mprotect(address: usize, size: usize, flags: usize) -> Result<usize> {
|
|
println!("mprotect {:#X}, {}, {:#X}", address, size, flags);
|
|
|
|
let end_offset = size.checked_sub(1).ok_or(Error::new(EFAULT))?;
|
|
let end_address = address.checked_add(end_offset).ok_or(Error::new(EFAULT))?;
|
|
|
|
let mut active_table = unsafe { ActivePageTable::new() };
|
|
|
|
let mut flush_all = MapperFlushAll::new();
|
|
|
|
let start_page = Page::containing_address(VirtualAddress::new(address));
|
|
let end_page = Page::containing_address(VirtualAddress::new(end_address));
|
|
for page in Page::range_inclusive(start_page, end_page) {
|
|
if let Some(mut page_flags) = active_table.translate_page_flags(page) {
|
|
if flags & PROT_EXEC > 0 {
|
|
page_flags.remove(EntryFlags::NO_EXECUTE);
|
|
} else {
|
|
page_flags.insert(EntryFlags::NO_EXECUTE);
|
|
}
|
|
|
|
if flags & PROT_WRITE > 0 {
|
|
//TODO: Not allowing gain of write privileges
|
|
} else {
|
|
page_flags.remove(EntryFlags::WRITABLE);
|
|
}
|
|
|
|
if flags & PROT_READ > 0 {
|
|
//TODO: No flags for readable pages
|
|
} else {
|
|
//TODO: No flags for readable pages
|
|
}
|
|
|
|
let flush = active_table.remap(page, page_flags);
|
|
flush_all.consume(flush);
|
|
} else {
|
|
return Err(Error::new(EFAULT));
|
|
}
|
|
}
|
|
|
|
flush_all.flush(&mut active_table);
|
|
|
|
Ok(0)
|
|
}
|
|
|
|
pub fn setpgid(pid: ContextId, pgid: ContextId) -> Result<usize> {
|
|
let contexts = context::contexts();
|
|
|
|
let current_pid = {
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
context.id
|
|
};
|
|
|
|
let context_lock = if pid.into() == 0 {
|
|
contexts.current().ok_or(Error::new(ESRCH))?
|
|
} else {
|
|
contexts.get(pid).ok_or(Error::new(ESRCH))?
|
|
};
|
|
|
|
let mut context = context_lock.write();
|
|
if context.id == current_pid || context.ppid == current_pid {
|
|
if pgid.into() == 0 {
|
|
context.pgid = context.id;
|
|
} else {
|
|
context.pgid = pgid;
|
|
}
|
|
Ok(0)
|
|
} else {
|
|
Err(Error::new(ESRCH))
|
|
}
|
|
}
|
|
|
|
pub fn sigaction(sig: usize, act_opt: Option<&SigAction>, oldact_opt: Option<&mut SigAction>, restorer: usize) -> Result<usize> {
|
|
if sig > 0 && sig <= 0x7F {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let mut actions = context.actions.lock();
|
|
|
|
if let Some(oldact) = oldact_opt {
|
|
*oldact = actions[sig].0;
|
|
}
|
|
|
|
if let Some(act) = act_opt {
|
|
actions[sig] = (*act, restorer);
|
|
}
|
|
|
|
Ok(0)
|
|
} else {
|
|
Err(Error::new(EINVAL))
|
|
}
|
|
}
|
|
|
|
pub fn sigprocmask(how: usize, mask_opt: Option<&[u64; 2]>, oldmask_opt: Option<&mut [u64; 2]>) -> Result<usize> {
|
|
{
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let mut context = context_lock.write();
|
|
|
|
if let Some(oldmask) = oldmask_opt {
|
|
*oldmask = context.sigmask;
|
|
}
|
|
|
|
if let Some(mask) = mask_opt {
|
|
match how {
|
|
SIG_BLOCK => {
|
|
context.sigmask[0] |= mask[0];
|
|
context.sigmask[1] |= mask[1];
|
|
},
|
|
SIG_UNBLOCK => {
|
|
context.sigmask[0] &= !mask[0];
|
|
context.sigmask[1] &= !mask[1];
|
|
},
|
|
SIG_SETMASK => {
|
|
context.sigmask[0] = mask[0];
|
|
context.sigmask[1] = mask[1];
|
|
},
|
|
_ => {
|
|
return Err(Error::new(EINVAL));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Ok(0)
|
|
}
|
|
|
|
pub fn sigreturn() -> Result<usize> {
|
|
{
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let mut context = context_lock.write();
|
|
context.ksig_restore = true;
|
|
context.block();
|
|
}
|
|
|
|
let _ = unsafe { context::switch() };
|
|
|
|
unreachable!();
|
|
}
|
|
|
|
pub fn umask(mask: usize) -> Result<usize> {
|
|
let previous;
|
|
{
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let mut context = context_lock.write();
|
|
previous = context.umask;
|
|
context.umask = mask;
|
|
}
|
|
|
|
Ok(previous)
|
|
}
|
|
|
|
fn reap(pid: ContextId) -> Result<ContextId> {
|
|
// Spin until not running
|
|
let mut running = true;
|
|
while running {
|
|
{
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.get(pid).ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
running = context.running;
|
|
}
|
|
|
|
interrupt::pause();
|
|
}
|
|
|
|
let mut contexts = context::contexts_mut();
|
|
let context_lock = contexts.remove(pid).ok_or(Error::new(ESRCH))?;
|
|
{
|
|
let mut context = context_lock.write();
|
|
empty(&mut context, true);
|
|
}
|
|
drop(context_lock);
|
|
|
|
Ok(pid)
|
|
}
|
|
|
|
pub fn waitpid(pid: ContextId, status_ptr: usize, flags: usize) -> Result<ContextId> {
|
|
let (ppid, waitpid) = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
(context.id, Arc::clone(&context.waitpid))
|
|
};
|
|
|
|
let mut tmp = [0];
|
|
let status_slice = if status_ptr != 0 {
|
|
validate_slice_mut(status_ptr as *mut usize, 1)?
|
|
} else {
|
|
&mut tmp
|
|
};
|
|
|
|
let mut grim_reaper = |w_pid: ContextId, status: usize| -> Option<Result<ContextId>> {
|
|
if wifcontinued(status) {
|
|
if flags & WCONTINUED == WCONTINUED {
|
|
status_slice[0] = status;
|
|
Some(Ok(w_pid))
|
|
} else {
|
|
None
|
|
}
|
|
} else if wifstopped(status) {
|
|
if flags & WUNTRACED == WUNTRACED {
|
|
status_slice[0] = status;
|
|
Some(Ok(w_pid))
|
|
} else {
|
|
None
|
|
}
|
|
} else {
|
|
status_slice[0] = status;
|
|
Some(reap(w_pid))
|
|
}
|
|
};
|
|
|
|
loop {
|
|
let res_opt = if pid.into() == 0 {
|
|
// Check for existence of child
|
|
{
|
|
let mut found = false;
|
|
|
|
let contexts = context::contexts();
|
|
for (_id, context_lock) in contexts.iter() {
|
|
let context = context_lock.read();
|
|
if context.ppid == ppid {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ! found {
|
|
return Err(Error::new(ECHILD));
|
|
}
|
|
}
|
|
|
|
if flags & WNOHANG == WNOHANG {
|
|
if let Some((_wid, (w_pid, status))) = waitpid.receive_any_nonblock() {
|
|
grim_reaper(w_pid, status)
|
|
} else {
|
|
Some(Ok(ContextId::from(0)))
|
|
}
|
|
} else {
|
|
let (_wid, (w_pid, status)) = waitpid.receive_any();
|
|
grim_reaper(w_pid, status)
|
|
}
|
|
} else if (pid.into() as isize) < 0 {
|
|
let pgid = ContextId::from(-(pid.into() as isize) as usize);
|
|
|
|
// Check for existence of child in process group PGID
|
|
{
|
|
let mut found = false;
|
|
|
|
let contexts = context::contexts();
|
|
for (_id, context_lock) in contexts.iter() {
|
|
let context = context_lock.read();
|
|
if context.pgid == pgid {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ! found {
|
|
return Err(Error::new(ECHILD));
|
|
}
|
|
}
|
|
|
|
if flags & WNOHANG == WNOHANG {
|
|
if let Some((w_pid, status)) = waitpid.receive_nonblock(&WaitpidKey {
|
|
pid: None,
|
|
pgid: Some(pgid)
|
|
}) {
|
|
grim_reaper(w_pid, status)
|
|
} else {
|
|
Some(Ok(ContextId::from(0)))
|
|
}
|
|
} else {
|
|
let (w_pid, status) = waitpid.receive(&WaitpidKey {
|
|
pid: None,
|
|
pgid: Some(pgid)
|
|
});
|
|
grim_reaper(w_pid, status)
|
|
}
|
|
} else {
|
|
let hack_status = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.get(pid).ok_or(Error::new(ECHILD))?;
|
|
let mut context = context_lock.write();
|
|
if context.ppid != ppid {
|
|
println!("TODO: Hack for rustc - changing ppid of {} from {} to {}", context.id.into(), context.ppid.into(), ppid.into());
|
|
context.ppid = ppid;
|
|
//return Err(Error::new(ECHILD));
|
|
Some(context.status)
|
|
} else {
|
|
None
|
|
}
|
|
};
|
|
|
|
if let Some(context::Status::Exited(status)) = hack_status {
|
|
let _ = waitpid.receive_nonblock(&WaitpidKey {
|
|
pid: Some(pid),
|
|
pgid: None
|
|
});
|
|
grim_reaper(pid, status)
|
|
} else if flags & WNOHANG == WNOHANG {
|
|
if let Some((w_pid, status)) = waitpid.receive_nonblock(&WaitpidKey {
|
|
pid: Some(pid),
|
|
pgid: None
|
|
}) {
|
|
grim_reaper(w_pid, status)
|
|
} else {
|
|
Some(Ok(ContextId::from(0)))
|
|
}
|
|
} else {
|
|
let (w_pid, status) = waitpid.receive(&WaitpidKey {
|
|
pid: Some(pid),
|
|
pgid: None
|
|
});
|
|
grim_reaper(w_pid, status)
|
|
}
|
|
};
|
|
|
|
if let Some(res) = res_opt {
|
|
return res;
|
|
}
|
|
}
|
|
}
|