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* [glibc] aarch64: Add setcontext support for SME
@ 2024-01-02 17:21 Szabolcs Nagy
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From: Szabolcs Nagy @ 2024-01-02 17:21 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9d30e5cf9687559d942514c780332d53b0617f0b
commit 9d30e5cf9687559d942514c780332d53b0617f0b
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Fri Dec 17 17:14:59 2021 +0000
aarch64: Add setcontext support for SME
For the ZA lazy saving scheme to work, setcontext has to call
__libc_arm_za_disable.
Also fixes swapcontext which uses setcontext internally.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diff:
---
sysdeps/unix/sysv/linux/aarch64/setcontext.S | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/sysdeps/unix/sysv/linux/aarch64/setcontext.S b/sysdeps/unix/sysv/linux/aarch64/setcontext.S
index 699c31189f..ba659438c5 100644
--- a/sysdeps/unix/sysv/linux/aarch64/setcontext.S
+++ b/sysdeps/unix/sysv/linux/aarch64/setcontext.S
@@ -49,6 +49,25 @@ ENTRY (__setcontext)
cbz x0, 1f
b C_SYMBOL_NAME (__syscall_error)
1:
+ /* Disable ZA of SME. */
+#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
/* Restore the general purpose registers. */
mov x0, x9
cfi_def_cfa (x0, 0)
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