From: Ramin Moussavi Subject: [PATCH] microblaze: wire up sigaltstack sigaltstack is wired to sys_ni_syscall - microblaze is the only architecture without it - although the microblaze signal delivery code fully supports the alternate signal stack: get_sigframe() picks the stack via sigsp(), setup_rt_frame() saves it with __save_altstack() and sys_rt_sigreturn() calls restore_altstack(). Wire it up to sys_sigaltstack. Tested on qemu petalogix-s3adsp1800 (microblazeel, kernel 6.5.10 and syscall table unchanged in current mainline) with the uClibc-ng test suite: the five sigaltstack-dependent NPTL tests (tst-cancel20/21, tst-cancelx20/21, tst-signal6) pass; before this change sigaltstack() returned ENOSYS. Signed-off-by: Ramin Moussavi --- a/arch/microblaze/kernel/syscalls/syscall.tbl +++ b/arch/microblaze/kernel/syscalls/syscall.tbl @@ -193,7 +193,7 @@ 183 common getcwd sys_getcwd 184 common capget sys_capget 185 common capset sys_capset -186 common sigaltstack sys_ni_syscall +186 common sigaltstack sys_sigaltstack 187 common sendfile sys_sendfile 188 common getpmsg sys_ni_syscall 189 common putpmsg sys_ni_syscall