CVS log for src/sys/arch/aarch64/aarch64/syscall.c

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Keyword substitution: kv
Default branch: MAIN

Arrange to update cached LWP credentials in userret() rather than during
syscall/trap entry, eliminating a test+branch on every syscall/trap.

This wasn't possible in the 3.99.x timeframe when l->l_cred came about
because there wasn't a reliable/timely way to force an ONPROC LWP running on
a remote CPU into the kernel (which is just about the only new thing in
this scheme).

aarch64: curcpu() audit.

Sprinkle KASSERT (or KDASSERT in hot paths) for kpreempt_disabled()
when we use curcpu() and it's not immediately obvious that the caller
has preemption disabled but closer scrutiny suggests the caller has.

Note unsafe curcpu()s for syscall event counting.  Not sure this is
worth changing.

Possible bugs fixed:

- cpu_irq and cpu_fiq could be preempted while trying to run softints
  on this CPU.

- data_abort_handler might incorrectly think it was invoked in
  interrupt context when it was only preempted and migrated to
  another CPU.

- pmap_fault_fixup might report the wrong CPU logs.

(However, we don't currently run with kpreemption on aarch64, so
these are not yet real bugs fixed except if you patch it to build
with __HAVE_PREEMPTION.)

remove unused code.
The syscall for 32bit uses aarch32_syscall.c, so there is no need to make syscall.c support it.

linux syscall should not break x1 register

In order to prevent uninitialized values from being reflected in the registers after syscall, rval[] must be initialized.

use lwp_trapframe() macro. NFC.

add support COMPAT_LINUX for aarch64

Sync with HEAD

add missing userret() at the end of md_child_return().
this change make some ATF to pass.

Centralized shared part of child_return() into MI part

Add a new function md_child_return() for MD specific bits only.

New child_return() is now part of MI and central code that handles
uniformly tracing code (KTR and ptrace(2)).

Synchronize value passed to ktrsysret() among ports to SYS_fork. This is
a traditional value and accessing p_lflag to check for PL_PPWAIT shall
use locking against proc_lock. Returning SYS_fork vs SYS_vfork still isn't
correct enough as there are more entry points to forking code. Instead of
making it too good, just settle with plain SYS_fork for all ports.

no need to include opt_multiprocessor.h here.

Sync with HEAD

add missing casts

Sync with HEAD.  77 conflicts resolved - all of them $NetBSD$

Add initial support for ARMv8 (AARCH64) (by nisimura@ and ryo@)

- sys/arch/evbarm64 is gone and integrated into sys/arch/evbarm. (by skrll@)
- add support fdt. evbarm/conf/GENERIC64 fdt (bcm2837,sunxi,tegra) based generic 64bit kernel config. (by skrll@, jmcneill@)

Rebase to HEAD as of a few days ago.

file syscall.c was added on branch tls-maxphys on 2014-08-20 00:02:39 +0000

Preliminary files for AARCH64 (64-bit ARM) support.
Enough for a distribution build.