linux: sparc: Fix clone for LEON/sparcv8 (BZ 31394)

The sparc clone mitigation (faeaa3bc9f76030) added the use of
flushw, which is not support by LEON/sparcv8.  As discussed on
the libc-alpha, 'ta 3' is a working alternative [1].

[1] https://sourceware.org/pipermail/libc-alpha/2024-August/158905.html

Checked with a build for sparcv8-linux-gnu targetting leon.

Acked-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
(cherry picked from commit 5e8cfc5d625e6dd000a0371d21d792836ea7951a)

diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/clone.S b/sysdeps/unix/sysv/linux/sparc/sparc32/clone.S
index c9cf9bb055bc0c5cba57d14cbe27d44877e28dd3..c84244f56bd396ac8f1adc468b7181feb5c31bd9 100644 (file)
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/clone.S
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/clone.S
@@ -29,7 +29,11 @@
 ENTRY (__clone)
        save    %sp,-96,%sp
        save    %sp,-96,%sp
+#ifdef __sparcv9
        flushw
+#else
+       ta 3
+#endif
        restore
        cfi_def_cfa_register(%fp)
        cfi_window_save