[RFC2 PATCH v6 00/19] ILP32 for ARM64

[Yury Norov <ynorov@caviumnetworks.com>]

------8<-----
Colleagues, I'm gonna to send it to list.
Please, take a look.
------8<-----

This is still RFC because ~20 tests still fail,
and because it's based on 4.3 kernel version, and
some work is needed to rebase on 4.4. I'd preffer
to do it later. 

v3: https://lkml.org/lkml/2014/9/3/704
v4: https://lkml.org/lkml/2015/4/13/691
v5: https://lkml.org/lkml/2015/9/29/911

v6:
 - time_t, __kenel_off_t and other types turned to be 32-bit
   for compatibility reasons (after v5 discussion);
 - related changes applied to ILP32 syscall table and handlers;
 - ILP32 VDSO code excluded. It's not mandatory, and caused questions
   during review process. We definitely make sure we will follow up
   with a VDSO later on because it is needed for performance reasons;
 - fixed build issues with different combinations of AARCH32 / ILP32
   enabling in config;
 - ILP32 TLS bug fixed;
 - entry32-common.S introduced to hold wrappers needed for both ILP32
   and AARCH32_EL0;
 - documentation updated according to latest changes;
 - rebased to the current head;
 - coding style re-checked;
 - ILP32 syscall table turned around.

Testing is performed using LTP with scenario 'ltplite'.
Tested on QEMU + vanilla defconfig kernel.
Regressions are mostly related to core dump genereation,
readdir(), and futex(). Some tests fail both in ILP32, and LP64.

The full regression table is:
		ILP32		LP64

float_bessel    FAIL	 134    PASSED	0
float_exp_log   FAIL	 134    PASSED	0
float_iperb     FAIL	 134    PASSED	0
float_power     FAIL	 134    PASSED	0
float_trigo     FAIL	 134    PASSED	0
abort01         FAIL       2    FAIL 	2
fcntl14         FAIL       2    FAIL 	2
kill11          FAIL       2    FAIL 	2
mmap16          FAIL       6    PASSED	0
open12          FAIL       2    PASSED	0
pause01         PASSED     0    FAIL 	9
pipe07          FAIL       2    PASSED	0
readdir01       FAIL       1    PASSED	0
rename11        FAIL       2    PASSED	0
rmdir02         FAIL       2    PASSED	0
setregid02      FAIL       1    FAIL 	1
settimeofday01  FAIL       1    FAIL 	1
umount2_01      FAIL       2    PASSED	0
umount2_02      FAIL       2    PASSED	0
umount2_03      FAIL       2    PASSED	0
utime06         FAIL       2    PASSED	0

Kernel with this patchset, and corresponding
version of glibc is here:
https://github.com/norov/

Andrew Pinski (14):
  arm64: ensure the kernel is compiled for LP64
  arm64: rename COMPAT to AARCH32_EL0 in Kconfig
  arm64: change some CONFIG_COMPAT over to use CONFIG_AARCH32_EL0
    instead
  arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64
  arm64:ilp32: share signal structures between ILP32 and LP64 ABIs
  arm64: introduce is_a32_task and is_a32_thread (for AArch32 compat)
  arm64:ilp32: add is_ilp32_compat_{task,thread} and TIF_32BIT_AARCH64
  arm64:ilp32: share HWCAP between LP64 and ILP32
  arm64:ilp32 use the native LP64 'start_thread' for ILP32 threads
  arm64:ilp32: support core dump generation for ILP32
  ptrace: Allow compat to use the native siginfo
  arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use
    it
  arm64:ilp32: use the native siginfo instead of the compat siginfo
  arm64:ilp32: add ARM64_ILP32 to Kconfig

Jan Dakinevich (2):
  ilp32: common 32-bit wrappers
  arm64: ilp32: force IPC_64 in msgctl, shmctl, semctl

Philipp Tomsich (2):
  arm64:ilp32: add documentation on the ILP32 ABI for ARM64
  arm64:ilp32: change COMPAT_ELF_PLATFORM to report a a subplatform for
    ILP32

Yury Norov (1):
  aarch64: ilp32: use generic stat64 structure

 Documentation/arm64/ilp32.txt             |  47 +++++++
 arch/arm64/Kconfig                        |  12 ++
 arch/arm64/Makefile                       |   5 +
 arch/arm64/include/asm/compat.h           |  70 +++++++++-
 arch/arm64/include/asm/elf.h              | 105 ++++++++++++--
 arch/arm64/include/asm/fpsimd.h           |   2 +-
 arch/arm64/include/asm/hwcap.h            |  12 +-
 arch/arm64/include/asm/memory.h           |   2 +-
 arch/arm64/include/asm/processor.h        |  18 ++-
 arch/arm64/include/asm/ptrace.h           |   2 +-
 arch/arm64/include/asm/signal32.h         |  19 +++
 arch/arm64/include/asm/stat.h             |   2 +
 arch/arm64/include/asm/thread_info.h      |   3 +-
 arch/arm64/include/asm/unistd.h           |  11 +-
 arch/arm64/include/uapi/asm/bitsperlong.h |   9 +-
 arch/arm64/include/uapi/asm/siginfo.h     |  21 +++
 arch/arm64/include/uapi/asm/signal.h      |  31 +++++
 arch/arm64/kernel/Makefile                |   4 +-
 arch/arm64/kernel/asm-offsets.c           |   2 +-
 arch/arm64/kernel/entry.S                 |  18 ++-
 arch/arm64/kernel/entry32-common.S        |  37 +++++
 arch/arm64/kernel/entry32.S               |  29 ----
 arch/arm64/kernel/head.S                  |   2 +-
 arch/arm64/kernel/hw_breakpoint.c         |   7 +-
 arch/arm64/kernel/perf_regs.c             |   2 +-
 arch/arm64/kernel/process.c               |   4 +-
 arch/arm64/kernel/ptrace.c                |  47 ++++---
 arch/arm64/kernel/signal.c                |  21 ++-
 arch/arm64/kernel/sys_ilp32.c             | 223 ++++++++++++++++++++++++++++++
 arch/arm64/kernel/traps.c                 |   4 +-
 arch/arm64/kernel/vdso.c                  |  12 +-
 include/linux/compat.h                    |   4 +
 include/uapi/asm-generic/siginfo.h        |  17 ++-
 include/uapi/asm-generic/signal.h         |  27 +++-
 kernel/ptrace.c                           |  24 +++-
 35 files changed, 745 insertions(+), 110 deletions(-)
 create mode 100644 Documentation/arm64/ilp32.txt
 create mode 100644 arch/arm64/kernel/entry32-common.S
 create mode 100644 arch/arm64/kernel/sys_ilp32.c

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2.1.4