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| author |   Sven Schnelle <svens@linux.ibm.com> | 2021-06-25 14:50:08 +0200 |
|---|---|---|
| committer |   Vasily Gorbik <gor@linux.ibm.com> | 2021-07-08 15:37:28 +0200 |
| commit | 779df2248739b6308c03b354c99e4c352141e3bc (patch) | |
| tree | 952ac56aee397e3d16bdecf4e4d9afa866b48978 /arch/s390/Kconfig | |
| parent | s390/vdso: rename VDSO64_LBASE to VDSO_LBASE (diff) | |
| download | linux-dev-779df2248739b6308c03b354c99e4c352141e3bc.tar.xz linux-dev-779df2248739b6308c03b354c99e4c352141e3bc.zip | |
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>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index ceaa50947d64..a0e2130f0100 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -437,6 +437,7 @@ config COMPAT select COMPAT_OLD_SIGACTION select HAVE_UID16 depends on MULTIUSER + depends on !CC_IS_CLANG help Select this option if you want to enable your system kernel to handle system-calls from ELF binaries for 31 bit ESA. This option |