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Copy TCB if it was not initialized using kernel-allocated TLS

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This commit is contained in:
Jeremy Soller
2019-04-15 20:47:27 -06:00
parent 6da3ab283e
commit b66fef0479
1 changed files with 13 additions and 8 deletions
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21
src/syscall/process.rs
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@@ -516,7 +516,7 @@ pub fn clone(flags: usize, stack_base: usize) -> Result<ContextId> {
// Set up TCB
let tcb_addr = ::USER_TCB_OFFSET + context.id.into() * PAGE_SIZE;
let mut tcb_mem = context::memory::Memory::new(
let mut tcb = context::memory::Memory::new(
VirtualAddress::new(tcb_addr),
PAGE_SIZE,
EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE | EntryFlags::USER_ACCESSIBLE,
@@ -525,17 +525,22 @@ pub fn clone(flags: usize, stack_base: usize) -> Result<ContextId> {
// Setup user TLS
if let Some(mut tls) = tls_option {
unsafe {
*(tcb_addr as *mut usize) = ::USER_TLS_OFFSET + tls.mem.size();
}
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_mem.move_to(VirtualAddress::new(tcb_addr), &mut new_table, &mut temporary_page);
context.image.push(tcb_mem.to_shared());
tcb.move_to(VirtualAddress::new(tcb_addr), &mut new_table, &mut temporary_page);
context.image.push(tcb.to_shared());
context.name = name;