[RFC2 nowrap: PATCH v7 00/18] ILP32 for ARM64

From: Yury Norov
Date: Wed Aug 17 2016 - 08:02:43 EST

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This series enables aarch64 with ilp32 mode, and as supporting work,
introduces ARCH_32BIT_OFF_T configuration option that is enabled for
existing 32-bit architectures but disabled for new arches (so 64-bit
off_t is is used by new userspace).

This version is based on kernel v4.8-rc2.
It works with glibc-2.23, and tested with LTP.

This is RFC because there is still no solid understanding what type of registers
top-halves delousing we prefer. In this patchset, w0-w7 are cleared for each
syscall in assembler entry. The alternative approach is in introducing compat
wrappers which is little faster for natively routed syscalls (~2.6% for syscall
with no payload) but much more complicated.

There's no major changes here comparing to previous submission, mostly
the rebase to current master. All changes in details are listed below.
No additional regression is observed since previous submission.

Patch 1 may be applied separately from other patches of series.

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: https://lkml.org/lkml/2016/5/23/661
v7: RFC nowrap: https://lkml.org/lkml/2016/6/17/990
v7: RFC2 nowrap:
- rebased on kernel 4.8-rc2;
- setrlimit(), getrlimit() are handled by non-compat handlers to follow
switching rlim_t to 64-bit in glibc, as pointed by Andreas Shwab;
- fixed {GET,SET}SIGMASK handling in ptrace(), as pointed by Zhou Chengming;
- removed put_sig{set,get)_t duplication;
- patches 1 and 2 from previous submission are joined, missed chunk restored,
found by by Andreas Shwab.

Links:
Kernel: https://github.com/norov/linux/commits/ilp32-4.8
glibc: https://github.com/norov/glibc/commits/ilp32-2.24-dev

Andrew Pinski (6):
arm64: ensure the kernel is compiled for LP64
arm64: rename COMPAT to AARCH32_EL0 in Kconfig
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

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

Yury Norov (11):
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: ilp32: share aarch32 syscall handlers
arm64: signal: share lp64 signal routines to ilp32
arm64: signal32: move ilp32 and aarch32 common code to separated file
arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32

Documentation/arm64/ilp32.txt | 54 ++++++++
arch/Kconfig | 4 +
arch/arc/Kconfig | 1 +
arch/arm/Kconfig | 1 +
arch/arm64/Kconfig | 19 ++-
arch/arm64/Makefile | 5 +
arch/arm64/include/asm/compat.h | 19 +--
arch/arm64/include/asm/elf.h | 29 +++--
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 | 90 ++++++++++++++
arch/arm64/include/asm/memory.h | 5 +-
arch/arm64/include/asm/processor.h | 11 +-
arch/arm64/include/asm/ptrace.h | 2 +-
arch/arm64/include/asm/signal32.h | 9 +-
arch/arm64/include/asm/signal32_common.h | 28 +++++
arch/arm64/include/asm/signal_common.h | 33 +++++
arch/arm64/include/asm/signal_ilp32.h | 38 ++++++
arch/arm64/include/asm/syscall.h | 2 +-
arch/arm64/include/asm/thread_info.h | 4 +-
arch/arm64/include/asm/unistd.h | 6 +-
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 | 18 ++-
arch/arm64/kernel/asm-offsets.c | 9 +-
arch/arm64/kernel/binfmt_elf32.c | 31 +++++
arch/arm64/kernel/binfmt_ilp32.c | 96 +++++++++++++++
arch/arm64/kernel/cpufeature.c | 8 +-
arch/arm64/kernel/cpuinfo.c | 20 +--
arch/arm64/kernel/entry.S | 34 ++++-
arch/arm64/kernel/entry32.S | 65 ----------
arch/arm64/kernel/entry32_common.S | 93 ++++++++++++++
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 | 110 +++++++++++++++--
arch/arm64/kernel/signal.c | 102 +++++++++------
arch/arm64/kernel/signal32.c | 107 ----------------
arch/arm64/kernel/signal32_common.c | 136 ++++++++++++++++++++
arch/arm64/kernel/signal_ilp32.c | 171 ++++++++++++++++++++++++++
arch/arm64/kernel/sys32.c | 1 +
arch/arm64/kernel/sys_ilp32.c | 86 +++++++++++++
arch/arm64/kernel/traps.c | 5 +-
arch/arm64/kernel/vdso-ilp32/.gitignore | 2 +
arch/arm64/kernel/vdso-ilp32/Makefile | 74 +++++++++++
arch/arm64/kernel/vdso-ilp32/vdso-ilp32.S | 33 +++++
arch/arm64/kernel/vdso-ilp32/vdso-ilp32.lds.S | 95 ++++++++++++++
arch/arm64/kernel/vdso.c | 79 +++++++++---
arch/arm64/kernel/vdso/gettimeofday.S | 18 ++-
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/score/Kconfig | 1 +
arch/sh/Kconfig | 1 +
arch/sparc/Kconfig | 1 +
arch/tile/Kconfig | 1 +
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/fcntl.h | 2 +-
include/linux/ptrace.h | 6 +
include/linux/thread_bits.h | 55 +++++++++
include/linux/thread_info.h | 44 +------
include/uapi/asm-generic/unistd.h | 5 +-
kernel/ptrace.c | 10 +-
83 files changed, 1597 insertions(+), 374 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/entry32_common.S
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 include/linux/thread_bits.h

--
2.7.4

Next message: Yury Norov: "[PATCH 03/18] arm64: ensure the kernel is compiled for LP64"
Previous message: Michal Hocko: "[PATCH] proc, smaps: reduce printing overhead"
Next in thread: Yury Norov: "[PATCH 05/18] arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64"
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