public inbox for glibc-cvs@sourceware.org
help / color / mirror / Atom feed
* [glibc] aarch64: Add longjmp support for SME
@ 2024-01-02 17:21 Szabolcs Nagy
0 siblings, 0 replies; only message in thread
From: Szabolcs Nagy @ 2024-01-02 17:21 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a7373e457f0b5953d230f7756627036b1711dcc3
commit a7373e457f0b5953d230f7756627036b1711dcc3
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Wed Dec 1 11:37:44 2021 +0000
aarch64: Add longjmp support for SME
For the ZA lazy saving scheme to work, longjmp has to call
__libc_arm_za_disable.
In ld.so we assume ZA is not used so longjmp does not need
special support there.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diff:
---
sysdeps/aarch64/__longjmp.S | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/sysdeps/aarch64/__longjmp.S b/sysdeps/aarch64/__longjmp.S
index 2c8ff54112..7b6add751e 100644
--- a/sysdeps/aarch64/__longjmp.S
+++ b/sysdeps/aarch64/__longjmp.S
@@ -49,6 +49,28 @@ ENTRY (__longjmp)
PTR_ARG (0)
+#if IS_IN(libc)
+ /* Disable ZA state of SME in libc.a and libc.so, but not in ld.so. */
+# if HAVE_AARCH64_PAC_RET
+ PACIASP
+ cfi_window_save
+# endif
+ stp x29, x30, [sp, -16]!
+ cfi_adjust_cfa_offset (16)
+ cfi_rel_offset (x29, 0)
+ cfi_rel_offset (x30, 8)
+ mov x29, sp
+ bl __libc_arm_za_disable
+ ldp x29, x30, [sp], 16
+ cfi_adjust_cfa_offset (-16)
+ cfi_restore (x29)
+ cfi_restore (x30)
+# if HAVE_AARCH64_PAC_RET
+ AUTIASP
+ cfi_window_save
+# endif
+#endif
+
ldp x19, x20, [x0, #JB_X19<<3]
ldp x21, x22, [x0, #JB_X21<<3]
ldp x23, x24, [x0, #JB_X23<<3]
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2024-01-02 17:21 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-01-02 17:21 [glibc] aarch64: Add longjmp support for SME Szabolcs Nagy
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).