aarch64: Disable ZA state of SME in setjmp and sigsetjmp

Due to the nature of the ZA state, setjmp() should clear it in the
same manner as it is already done by longjmp.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

diff --git a/sysdeps/aarch64/setjmp.S b/sysdeps/aarch64/setjmp.S
index d82d62c0a1c4f718982d9d8c4d4144ef94cac4e5..83d1e342bc368e76272b11f282775ec1ee9b19e7 100644 (file)
--- a/sysdeps/aarch64/setjmp.S
+++ b/sysdeps/aarch64/setjmp.S
@@ -35,6 +35,29 @@ libc_hidden_def (_setjmp)
 
 ENTRY_ALIGN (__sigsetjmp, 2)
 1:
+
+#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
+
        stp     x19, x20, [x0, #JB_X19<<3]
        stp     x21, x22, [x0, #JB_X21<<3]
        stp     x23, x24, [x0, #JB_X23<<3]