CVS commit: src/sys/arch/aarch64

["Rin Okuyama" <rin%netbsd.org@localhost>]

Module Name:    src
Committed By:   rin
Date:           Sun Nov 24 04:08:36 UTC 2019

Modified Files:
        src/sys/arch/aarch64/aarch64: exec_machdep.c netbsd32_machdep.c trap.c
        src/sys/arch/aarch64/include: netbsd32_machdep.h param.h proc.h

Log Message:
PR port-arm/54702

Add support for earmv6hf binaries on COMPAT_NETBSD32 for aarch64:

- Emulate ARMv6 instructions with cache operations register (c7), that
  are deprecated since ARMv7, and disabled on ARMv8 with LP64 kernel.

- ep_machine_arch (default: earmv7hf) is copied from executables, as we
  do for mips64. "uname -p" reports earmv6hf if compiled for earmv6hf;
  configure scripts etc can determine the appropriate architecture.

Many thanks to ryo@ for helping me to add support of Thumb-mode,
as well as providing exhaustive test cases:

  https://github.com/ryo/mcr_test/

We've confirmed:

- Emulation works in Thumb-mode.
- T32 16-bit length illegal instruction results in SIGILL, even if
  it is located nearby a boundary b/w mapped and unmapped pages.
- T32 32-bit instruction results in SIGSEGV if it is located across
  a boundary b/w mapped and unmapped pages.

XXX
pullup to netbsd-9


To generate a diff of this commit:
cvs rdiff -u -r1.4 -r1.5 src/sys/arch/aarch64/aarch64/exec_machdep.c
cvs rdiff -u -r1.8 -r1.9 src/sys/arch/aarch64/aarch64/netbsd32_machdep.c
cvs rdiff -u -r1.20 -r1.21 src/sys/arch/aarch64/aarch64/trap.c
cvs rdiff -u -r1.2 -r1.3 src/sys/arch/aarch64/include/netbsd32_machdep.h
cvs rdiff -u -r1.12 -r1.13 src/sys/arch/aarch64/include/param.h
cvs rdiff -u -r1.3 -r1.4 src/sys/arch/aarch64/include/proc.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.