This series of patches brings in 32-bit arm support for bsd-user.  It implements
all the bits needed to do image activation, signal handling, stack management
and threading. This allows us to get to the "Hello World" level and also to
satisfy all linking requirements. I've sliced up the current bsd-user fork
versions of all this code into what I hope are right-sized reviewable chunks.

make checkpatch has a couple of complaints about the comments for the signal
trampoline:
WARNING: Block comments use a leading /* on a separate line
+    /* 8 */ sys_sigreturn,

WARNING: Block comments use a leading /* on a separate line
+    /* 9 */ sys_exit

that I think should be ignored.

Warner Losh (24):
  bsd-user/arm/target_arch_sysarch.h: Use consistent include guards
  bsd-user/arm/target_syscall.h: Add copyright and update name
  bsd-user/arm/target_arch_cpu.c: Target specific TLS routines
  bsd-user/arm/target_arch_cpu.h: CPU Loop definitions
  bsd-user/arm/target_arch_cpu.h: Implement target_cpu_clone_regs
  bsd-user/arm/target_arch_cpu.h: Dummy target_cpu_loop implementation
  bsd-user/arm/target_arch_cpu.h: Implment trivial EXCP exceptions
  bsd-user/arm/target_arch_cpu.h: Implement data abort exceptions
  bsd-user/arm/target_arch_cpu.h: Implement system call dispatch
  bsd-user/arm/target_arch_reg.h: Implement core dump register copying
  bsd-user/arm/target_arch_vmparam.h: Parameters for arm address space
  bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm
  bsd-user/arm/target_arch_thread.h: Routines to create and switch to a
    thread
  bsd-user/arm/target_arch_elf.h: arm defines for ELF
  bsd-user/arm/target_arch_elf.h: arm get hwcap
  bsd-user/arm/target_arch_elf.h: arm get_hwcap2 impl
  bsd-user/arm/target_arch_signal.h: arm specific signal registers and
    stack
  bsd-user/arm/target_arch_signal.h: arm machine context for signals
  bsd-user/arm/target_arch_signal.h: arm user context and trapframe for
    signals
  bsd-user/arm/target_arch_signal.h: arm set_sigtramp_args
  bsd-user/arm/target_arch_signal.h: arm get_mcontext
  bsd-user/arm/target_arch_signal.h: arm set_mcontext
  bsd-user/arm/target_arch_signal.h: arm get_ucontext_sigreturn
  bsd-user: add arm target build

 bsd-user/arm/target_arch.h          |  28 +++
 bsd-user/arm/target_arch_cpu.c      |  39 +++++
 bsd-user/arm/target_arch_cpu.h      | 206 ++++++++++++++++++++++
 bsd-user/arm/target_arch_elf.h      | 128 ++++++++++++++
 bsd-user/arm/target_arch_reg.h      |  60 +++++++
 bsd-user/arm/target_arch_signal.h   | 253 ++++++++++++++++++++++++++++
 bsd-user/arm/target_arch_sigtramp.h |  52 ++++++
 bsd-user/arm/target_arch_sysarch.h  |   6 +-
 bsd-user/arm/target_arch_thread.h   |  71 ++++++++
 bsd-user/arm/target_arch_vmparam.h  |  48 ++++++
 bsd-user/arm/target_syscall.h       |  27 ++-
 configs/targets/arm-bsd-user.mak    |   2 +
 12 files changed, 913 insertions(+), 7 deletions(-)
 create mode 100644 bsd-user/arm/target_arch.h
 create mode 100644 bsd-user/arm/target_arch_cpu.c
 create mode 100644 bsd-user/arm/target_arch_cpu.h
 create mode 100644 bsd-user/arm/target_arch_elf.h
 create mode 100644 bsd-user/arm/target_arch_reg.h
 create mode 100644 bsd-user/arm/target_arch_signal.h
 create mode 100644 bsd-user/arm/target_arch_sigtramp.h
 create mode 100644 bsd-user/arm/target_arch_thread.h
 create mode 100644 bsd-user/arm/target_arch_vmparam.h
 create mode 100644 configs/targets/arm-bsd-user.mak

-- 
2.32.0