Misc exception handling fixups

See merge request !163

Fixes for grant maps and others

See merge request !162

When mapping one (from) virtual address range to another (to) virtual
address range, be mindful of which mapper type to use for each range.

Before this, the same mapper type was used for both ranges. This meant
that if from and to were different (as in not both kernel virtual
addresses or user virtual addresses) then it would appear that either
from or to was not mapped previously and the kernel would panic.

This makes asserts on VirtualAddressType equality possible.

Wip clone and misc fixes

See merge request !161

At present these are done 'wholesale' without any regard for x86_64.
That needs to change eventually.

FIXME: Explain the magic numbers here later.

No CLONE_STACK functionality yet.

Was using the incorrect USER_TLS_OFFSET instead of USER_TCB_OFFSET. In
any case, this is better done in process::clone.

So we can more clearly see when things go wrong.

Pagetabletype and misc fixes

See merge request !158

Misc fixes

See merge request !160

Robin Randhawa authored 4 years ago and Jeremy Soller committed 4 years ago

We use a target-feature for this now.

Robin Randhawa authored 4 years ago and Jeremy Soller committed 4 years ago

Oddly, not specifying this or using aarch64-unknown-none (which would be
the default that cc gets from the TARGET environment variable) both
fail to invoke the appropriate compiler to build the asm code.

Using aarch64-unknown-redox works but shouldn't really be needed. This
is perhaps because of some odd arrangement of KTARGET, TARGET, the
installed prefix toolchain and the kernel target JSON spec.

The early_init asm code shall be replaced by a pure Rust bootloader
eventually so let's move with this for the moment.