[RFC6 PATCH v6 00/21] ILP32 for ARM64

Yury Norov
2016-04-05T22:08:22Z

This version is rebased on kernel v4.6-rc2, and has fixes in signal subsystem.
It works with updated glibc [1] (though very draft), and tested with LTP.

It was tested on QEMU and ThunderX machines. No major difference found.
This is RFC because ILP32 is not tested in big-endian mode.

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.

rfc3:
- all structures and system calls are just like AARCH32 ones now. with 2
exceptions: syscalls that take 64-bit parameter in 2 32-bit regosters
are replaced with LP64 version; struct rt_sigframe is constructed both
from LP64 and AARCH32 fields to be consistent with AARCH64 register set;
- documentation rewritten accordingly;
- common code for all 3 ABIs is moved to separated files for easy use,
new headers and objects are introduced, incl: is_compat.h, thread_bits.h,
signal_common.h, signal32_common.h.
- ILP32 VDSO code restored, Nathans comments are addressed;
- patch "arm64: ilp32: force IPC_64 in msgctl, shmctl, semctl" removed, as
Arnd suggested general solution for IPC_64 problem.

rfc4:
- sys_ilp32.c syscall list is fixed according to comments;
- binfmt_elf32.c and binfmt_ilp32.c are introduced to host the code handling
corresponding formats;
- statfs64, fstsatfs64 and mmap wrappers are removed;
- rebased on v4.4-rc8 + http://www.spinics.net/lists/kernel/msg2151759.html

rfc5:
- addressed rfc4 comments;
- turned s390 compat wrappers to be generic and applied it to arm64/ilp32.
Heiko Carsten and Martin Schwidefsky added to CC as s390 maintainers.

rfc6:
- glibc follows new ABI, [1];
- significant rework for signal subsystem (patches 21, 23) - struct ucontext
is now corresponds user representation;
- compat wrappers and 32-bit off_t patchsets are joined with this patchset,
as for now ilp32 is the only user for them;
- moved to kernel v4.6-rc2;
- few minor bugfixes.

[1] https://github.com/norov/glibc/tree/new-api

Andrew Pinski (7):
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: add sys_ilp32.c and a separate table (in entry.S) to use
it
arm64: ilp32: introduce ilp32-specific handlers for sigframe and
ucontext
arm64:ilp32: add ARM64_ILP32 to Kconfig

Bamvor Jian Zhang (1):
arm64: compat: change config dependences to aarch32

Philipp Tomsich (1):
arm64:ilp32: add vdso-ilp32 and use for signal return

Yury Norov (16):
all: syscall wrappers: add documentation
all: introduce COMPAT_WRAPPER option and enable it for s390
all: s390: move wrapper infrastructure to generic headers
all: s390: move compat_wrappers.c from arch/s390/kernel to kernel/
all: wrap needed syscalls in generic unistd
compat ABI: use non-compat openat and open_by_handle_at variants
32-bit ABI: introduce ARCH_32BIT_OFF_T config option
arm64: ilp32: add documentation on the ILP32 ABI for ARM64
thread: move thread bits accessors to separated file
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: introduce binfmt_elf32.c
arm64: ilp32: introduce binfmt_ilp32.c
arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32
arm64: signal: share lp64 signal routines to ilp32
arm64: signal32: move ilp32 and aarch32 common code to separated file

Documentation/adding-syscalls.txt | 32 +++
Documentation/arm64/ilp32.txt | 13 ++
arch/Kconfig | 8 +
arch/arc/Kconfig | 1 +
arch/arm/Kconfig | 1 +
arch/arm64/Kconfig | 17 +-
arch/arm64/Makefile | 5 +
arch/arm64/include/asm/compat.h | 19 +-
arch/arm64/include/asm/elf.h | 35 +---
arch/arm64/include/asm/fpsimd.h | 2 +-
arch/arm64/include/asm/ftrace.h | 2 +-
arch/arm64/include/asm/hwcap.h | 6 +-
arch/arm64/include/asm/is_compat.h | 84 ++++++++
arch/arm64/include/asm/memory.h | 3 +-
arch/arm64/include/asm/processor.h | 11 +-
arch/arm64/include/asm/ptrace.h | 2 +-
arch/arm64/include/asm/signal32.h | 6 +-
arch/arm64/include/asm/signal32_common.h | 25 +++
arch/arm64/include/asm/signal_common.h | 33 +++
arch/arm64/include/asm/signal_ilp32.h | 34 ++++
arch/arm64/include/asm/syscall.h | 2 +-
arch/arm64/include/asm/thread_info.h | 3 +-
arch/arm64/include/asm/unistd.h | 11 +-
arch/arm64/include/asm/unistd32.h | 2 +-
arch/arm64/include/asm/vdso.h | 6 +
arch/arm64/include/uapi/asm/bitsperlong.h | 9 +-
arch/arm64/kernel/Makefile | 12 +-
arch/arm64/kernel/asm-offsets.c | 2 +-
arch/arm64/kernel/binfmt_elf32.c | 33 +++
arch/arm64/kernel/binfmt_ilp32.c | 91 +++++++++
arch/arm64/kernel/cpufeature.c | 8 +-
arch/arm64/kernel/cpuinfo.c | 4 +-
arch/arm64/kernel/entry.S | 18 +-
arch/arm64/kernel/entry_ilp32.S | 23 +++
arch/arm64/kernel/head.S | 2 +-
arch/arm64/kernel/hw_breakpoint.c | 10 +-
arch/arm64/kernel/perf_regs.c | 2 +-
arch/arm64/kernel/process.c | 7 +-
arch/arm64/kernel/ptrace.c | 67 ++++++-
arch/arm64/kernel/signal.c | 100 ++++++----
arch/arm64/kernel/signal32.c | 85 --------
arch/arm64/kernel/signal32_common.c | 115 +++++++++++
arch/arm64/kernel/signal_ilp32.c | 192 ++++++++++++++++++
arch/arm64/kernel/sys32.c | 1 +
arch/arm64/kernel/sys_ilp32.c | 68 +++++++
arch/arm64/kernel/traps.c | 5 +-
arch/arm64/kernel/vdso-ilp32/.gitignore | 2 +
arch/arm64/kernel/vdso-ilp32/Makefile | 72 +++++++
arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S | 33 +++
arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S | 95 +++++++++
arch/arm64/kernel/vdso.c | 65 ++++--
arch/blackfin/Kconfig | 1 +
arch/cris/Kconfig | 1 +
arch/frv/Kconfig | 1 +
arch/h8300/Kconfig | 1 +
arch/hexagon/Kconfig | 1 +
arch/m32r/Kconfig | 1 +
arch/m68k/Kconfig | 1 +
arch/metag/Kconfig | 1 +
arch/microblaze/Kconfig | 1 +
arch/mips/Kconfig | 1 +
arch/mn10300/Kconfig | 1 +
arch/nios2/Kconfig | 1 +
arch/openrisc/Kconfig | 1 +
arch/parisc/Kconfig | 1 +
arch/powerpc/Kconfig | 1 +
arch/s390/Kconfig | 1 +
arch/s390/include/asm/compat.h | 17 +-
arch/s390/kernel/Makefile | 2 +-
arch/s390/kernel/compat_linux.c | 4 +
arch/s390/kernel/compat_wrapper.c | 180 -----------------
arch/score/Kconfig | 1 +
arch/sh/Kconfig | 1 +
arch/sparc/Kconfig | 1 +
arch/tile/Kconfig | 1 +
arch/tile/kernel/compat.c | 3 +
arch/unicore32/Kconfig | 1 +
arch/x86/Kconfig | 1 +
arch/x86/um/Kconfig | 1 +
arch/xtensa/Kconfig | 1 +
drivers/clocksource/arm_arch_timer.c | 2 +-
include/linux/compat.h | 277 ++++++++++++++++++++++++++
include/linux/fcntl.h | 2 +-
include/linux/ptrace.h | 6 +
include/linux/syscalls.h | 57 +-----
include/linux/syscalls_structs.h | 60 ++++++
include/linux/thread_bits.h | 55 +++++
include/linux/thread_info.h | 44 +---
include/uapi/asm-generic/unistd.h | 231 ++++++++++-----------
kernel/Makefile | 1 +
kernel/compat_wrapper.c | 175 ++++++++++++++++
kernel/ptrace.c | 10 +-
92 files changed, 1997 insertions(+), 637 deletions(-)
create mode 100644 Documentation/arm64/ilp32.txt
create mode 100644 arch/arm64/include/asm/is_compat.h
create mode 100644 arch/arm64/include/asm/signal32_common.h
create mode 100644 arch/arm64/include/asm/signal_common.h
create mode 100644 arch/arm64/include/asm/signal_ilp32.h
create mode 100644 arch/arm64/kernel/binfmt_elf32.c
create mode 100644 arch/arm64/kernel/binfmt_ilp32.c
create mode 100644 arch/arm64/kernel/entry_ilp32.S
create mode 100644 arch/arm64/kernel/signal32_common.c
create mode 100644 arch/arm64/kernel/signal_ilp32.c
create mode 100644 arch/arm64/kernel/sys_ilp32.c
create mode 100644 arch/arm64/kernel/vdso-ilp32/.gitignore
create mode 100644 arch/arm64/kernel/vdso-ilp32/Makefile
create mode 100644 arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S
create mode 100644 arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S
delete mode 100644 arch/s390/kernel/compat_wrapper.c
create mode 100644 include/linux/syscalls_structs.h
create mode 100644 include/linux/thread_bits.h
create mode 100644 kernel/compat_wrapper.c

--
2.5.0