[RFC nowrap: PATCH v7 00/19] ILP32 for ARM64

Yury Norov
2016-06-17T23:54:09Z

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 v4.7-rc3.
It works with glibc-2.23, and tested with LTP.

This is RFC because there is 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.

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:
- wrappers removed, unconditional register delousing is introduced.
- ino_t, off_t etc are turned to 64-bit.
- added is_compat_thread(),
- fixed ilp32 ELF_PLATFORM MACRO,
- fixed ilp32 ELF_DYN_BASE,
- ptrace redirected to compat version.
- stat, statfs - related syscalls are redirected to native handlers.
- elf_greg_t and elf_gregset_t types are taken from lp64.
- Documentation updated.

Links:
This series: https://github.com/norov/linux/commits/ilp32-nowrap
v7 with wrappers: https://github.com/norov/linux/commits/ilp32
glibc (dirty): https://github.com/norov/glibc/commits/ilp32-nowrap
glibc with wrappers: https://github.com/norov/glibc/commits/ilp32-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 (12):
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: ilp32: share aarch32 syscall handlers
arm64: signal: share lp64 signal routines to ilp32
arm64: signal32: move ilp32 and aarch32 common code to separated file

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 | 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 | 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 | 14 +-
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 | 35 ++++-
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 | 67 +++++++--
arch/arm64/kernel/signal.c | 102 +++++++++-----
arch/arm64/kernel/signal32.c | 85 -----------
arch/arm64/kernel/signal32_common.c | 115 +++++++++++++++
arch/arm64/kernel/signal_ilp32.c | 194 ++++++++++++++++++++++++++
arch/arm64/kernel/sys32.c | 1 +
arch/arm64/kernel/sys_ilp32.c | 84 +++++++++++
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 | 65 +++++++--
arch/arm64/kernel/vdso/gettimeofday.S | 20 ++-
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/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/fcntl.h | 2 +-
include/linux/ptrace.h | 6 +
include/linux/thread_bits.h | 55 ++++++++
include/linux/thread_info.h | 44 +-----
kernel/ptrace.c | 10 +-
83 files changed, 1536 insertions(+), 343 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