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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2023-12-27 18:36:10 +0000 |
|---|---|---|
| committer | Yury Khrustalev <yury.khrustalev@arm.com> | 2025-01-20 09:22:41 +0000 |
| commit | 1cf59c2603be88e3c97e68b1f219647f20310215 (patch) | |
| tree | a0aae49f4af85f1c8ab6317ff4b40ad061ca67b6 /sysdeps | |
| parent | 5ff5e7836e97a2d87778936b29c9607c120251be (diff) | |
| download | glibc-1cf59c2603be88e3c97e68b1f219647f20310215.zip glibc-1cf59c2603be88e3c97e68b1f219647f20310215.tar.gz glibc-1cf59c2603be88e3c97e68b1f219647f20310215.tar.bz2 | |
aarch64: Add GCS support to vfork
Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/aarch64/vfork.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/vfork.S b/sysdeps/unix/sysv/linux/aarch64/vfork.S index 2761856..d5943a7 100644 --- a/sysdeps/unix/sysv/linux/aarch64/vfork.S +++ b/sysdeps/unix/sysv/linux/aarch64/vfork.S @@ -33,8 +33,13 @@ ENTRY (__vfork) cmn x0, #4095 b.cs .Lsyscall_error + cbz x0, L(child) RET - +L(child): + /* Return with indirect branch in the child to support GCS. + Compilers insert BTI instruction after vfork() to make + sure return via BR works on systems with BTI. */ + br x30 PSEUDO_END (__vfork) libc_hidden_def (__vfork) |