Make sure the syscall table entries are aligned on a 4-byte boundary.
Required for strict-alignment architectures and a good idea on others.
same as kettenis commit to libc

Populate the non-LOAD openbsd.syscalls section (and PT_OPENBSD_SYSCALL)
with {uint offset, uint syscall#} entries in libc & ld.so.
In libc a few syscall# entries (break, sigprocmask, _tfork, _threxit)
are duplicated because additional or inline uses occur (that situation
is handled elsewhere)
ok kettenis

Now that the kernel skips the two instructions immediately following
a syscall, replace the double nop with a dsb nsh; isb; sequence which
stops the CPU from speculating any further. This fix was suggested
by Anthony Steinhauser.

ok deraadt@

Insert two nop instructions after each svc #0 instruction in userland.
The will be replaced by a speculation barrier as soon as we teach the
kernel to skip over these two instructions when returning from a
system call.

ok patrick@, deraadt@

Add retguard to arm64 ld.so.
ok kettenis@

On arm64 negate the whole 64-bit register otherwise system call wrappers
that return ssize_t will not return a negative value upon error.

Fixes dynamical loading of shared objects using dlopen().

ok guenther@

Replace heaps of hand-written syscall stubs with a simpler framework
which is largely MI.
ok visa kettenis

Make sure the syscall table entries are aligned on a 4-byte boundary.
Required for strict-alignment architectures and a good idea on others.
same as kettenis commit to libc

Populate the non-LOAD openbsd.syscalls section (and PT_OPENBSD_SYSCALL)
with {uint offset, uint syscall#} entries in libc & ld.so.
In libc a few syscall# entries (break, sigprocmask, _tfork, _threxit)
are duplicated because additional or inline uses occur (that situation
is handled elsewhere)
ok kettenis

Now that the kernel skips the two instructions immediately following
a syscall, replace the double nop with a dsb nsh; isb; sequence which
stops the CPU from speculating any further. This fix was suggested
by Anthony Steinhauser.

ok deraadt@

Insert two nop instructions after each svc #0 instruction in userland.
The will be replaced by a speculation barrier as soon as we teach the
kernel to skip over these two instructions when returning from a
system call.

ok patrick@, deraadt@

Add retguard to arm64 ld.so.
ok kettenis@

On arm64 negate the whole 64-bit register otherwise system call wrappers
that return ssize_t will not return a negative value upon error.

Fixes dynamical loading of shared objects using dlopen().

ok guenther@

Replace heaps of hand-written syscall stubs with a simpler framework
which is largely MI.
ok visa kettenis

Now that the kernel skips the two instructions immediately following
a syscall, replace the double nop with a dsb nsh; isb; sequence which
stops the CPU from speculating any further. This fix was suggested
by Anthony Steinhauser.

ok deraadt@

Insert two nop instructions after each svc #0 instruction in userland.
The will be replaced by a speculation barrier as soon as we teach the
kernel to skip over these two instructions when returning from a
system call.

ok patrick@, deraadt@

Add retguard to arm64 ld.so.
ok kettenis@

On arm64 negate the whole 64-bit register otherwise system call wrappers
that return ssize_t will not return a negative value upon error.

Fixes dynamical loading of shared objects using dlopen().

ok guenther@

Replace heaps of hand-written syscall stubs with a simpler framework
which is largely MI.
ok visa kettenis

Insert two nop instructions after each svc #0 instruction in userland.
The will be replaced by a speculation barrier as soon as we teach the
kernel to skip over these two instructions when returning from a
system call.

ok patrick@, deraadt@

Add retguard to arm64 ld.so.
ok kettenis@

On arm64 negate the whole 64-bit register otherwise system call wrappers
that return ssize_t will not return a negative value upon error.

Fixes dynamical loading of shared objects using dlopen().

ok guenther@

Replace heaps of hand-written syscall stubs with a simpler framework
which is largely MI.
ok visa kettenis

Add retguard to arm64 ld.so.
ok kettenis@

On arm64 negate the whole 64-bit register otherwise system call wrappers
that return ssize_t will not return a negative value upon error.

Fixes dynamical loading of shared objects using dlopen().

ok guenther@

Replace heaps of hand-written syscall stubs with a simpler framework
which is largely MI.
ok visa kettenis

On arm64 negate the whole 64-bit register otherwise system call wrappers
that return ssize_t will not return a negative value upon error.

Fixes dynamical loading of shared objects using dlopen().

ok guenther@

Replace heaps of hand-written syscall stubs with a simpler framework
which is largely MI.
ok visa kettenis

Replace heaps of hand-written syscall stubs with a simpler framework
which is largely MI.
ok visa kettenis