[RFC2 PATCH v6 00/19] ILP32 for ARM64

Yury Norov
2015-11-17T21:16:40Z

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