[RFC5 PATCH v6 00/21] ILP32 for ARM64

Yury Norov
2016-01-14T17:23:39Z

This is still RFC because we have no glibc yet, that correspnds new ABI
introduced here. And so we cannot run tests. LP64 and AARCH32 tests show
no regression though.

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.

Andrew Pinski (6):
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: 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 (13):
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: wrap struct ucontext, fp and lr with struct sigframe
arm64: signal: share lp64 signal routines to ilp32
arm64: signal32: move ilp32 and aarch32 common code to separated file
arm64: ilp32: introduce ilp32-specific handlers for sigframe
all: s390: make compat wrappers the generic solution
arm64: ilp32: wrap syscalls to remove top 32-bit vulnerability

Documentation/arm64/ilp32.txt | 13 ++
arch/Kconfig | 4 +
arch/arm64/Kconfig | 17 +-
arch/arm64/Makefile | 5 +
arch/arm64/include/asm/compat.h | 19 +-
arch/arm64/include/asm/compat_wrapper.h | 14 ++
arch/arm64/include/asm/elf.h | 32 +--
arch/arm64/include/asm/fpsimd.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 | 39 ++++
arch/arm64/include/asm/signal_ilp32.h | 34 ++++
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 | 5 +-
arch/arm64/kernel/ptrace.c | 65 ++++++-
arch/arm64/kernel/signal.c | 47 +++--
arch/arm64/kernel/signal32.c | 85 --------
arch/arm64/kernel/signal32_common.c | 115 +++++++++++
arch/arm64/kernel/signal_ilp32.c | 128 ++++++++++++
arch/arm64/kernel/sys32.c | 1 +
arch/arm64/kernel/sys_ilp32.c | 69 +++++++
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/s390/Kconfig | 1 +
arch/s390/include/asm/compat_wrapper.h | 25 +++
arch/s390/kernel/Makefile | 2 +-
arch/s390/kernel/compat_linux.c | 6 +
arch/s390/kernel/compat_wrapper.c | 179 -----------------
drivers/clocksource/arm_arch_timer.c | 2 +-
include/linux/compat_wrapper.h | 270 ++++++++++++++++++++++++++
include/linux/ptrace.h | 6 +
include/linux/thread_bits.h | 55 ++++++
include/linux/thread_info.h | 44 +----
include/uapi/asm-generic/unistd.h | 224 ++++++++++-----------
kernel/Makefile | 1 +
kernel/compat_wrapper.c | 167 ++++++++++++++++
kernel/ptrace.c | 10 +-
61 files changed, 1777 insertions(+), 554 deletions(-)
create mode 100644 Documentation/arm64/ilp32.txt
create mode 100644 arch/arm64/include/asm/compat_wrapper.h
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
create mode 100644 arch/s390/include/asm/compat_wrapper.h
delete mode 100644 arch/s390/kernel/compat_wrapper.c
create mode 100644 include/linux/compat_wrapper.h
create mode 100644 include/linux/thread_bits.h
create mode 100644 kernel/compat_wrapper.c

--
2.5.0