linux/arch/s390/kernel/vdso32/gen_vdso_offsets.sh

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0

#
# Match symbols in the DSO that look like VDSO_*; produce a header file
# of constant offsets into the shared object.
#
# Doing this inside the Makefile will break the $(filter-out) function,
# causing Kbuild to rebuild the vdso-offsets header file every time.
#
# Inspired by arm64 version.
#

LC_ALL=C
sed -n 's/\([0-9a-f]*\) . __kernel_compat_\(.*\)/\#define vdso32_offset_\2\t0x\1/p'
s390/vdso: add minimal compat vdso Add a small vdso for 31 bit compat application that provides trampolines for calls to sigreturn,rt_sigreturn,syscall_restart. This is requird for moving these syscalls away from the signal frame to the vdso. Note that this patch effectively disables CONFIG_COMPAT when using clang to compile the kernel. clang doesn't support 31 bit mode. We want to redirect sigreturn and restart_syscall to the vdso. However, the kernel cannot parse the ELF vdso file, so we need to generate header files which contain the offsets of the syscall instructions in the vdso page. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> 2021-06-25 14:50:08 +02:00			`#!/bin/sh`
			`# SPDX-License-Identifier: GPL-2.0`

			`#`
			`# Match symbols in the DSO that look like VDSO_*; produce a header file`
			`# of constant offsets into the shared object.`
			`#`
			`# Doing this inside the Makefile will break the $(filter-out) function,`
			`# causing Kbuild to rebuild the vdso-offsets header file every time.`
			`#`
			`# Inspired by arm64 version.`
			`#`

			`LC_ALL=C`
			`sed -n 's/\([0-9a-f]\) . __kernel_compat_\(.\)/\#define vdso32_offset_\2\t0x\1/p'`