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microblaze: wire up sigaltstack

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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) 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.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Ramin Moussavi <ramin.moussavi@yacoub.de>
Tested-by: Waldemar Brodkorb <wbx@openadk.org>
Link: https://patch.msgid.link/20260821151809.1233057-2-ramin.moussavi@yacoub.de
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Ramin Moussavi 2026-08-21 17:18:05 +02:00 committed by Michal Simek
parent e44c5ef7a0
commit 730e01d932
1 changed files with 1 additions and 1 deletions
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2
arch/microblaze/kernel/syscalls/syscall.tbl
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@ -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