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-rw-r--r--arch/parisc/kernel/vdso32/restart_syscall.S32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/parisc/kernel/vdso32/restart_syscall.S b/arch/parisc/kernel/vdso32/restart_syscall.S
new file mode 100644
index 000000000..7e82008d7
--- /dev/null
+++ b/arch/parisc/kernel/vdso32/restart_syscall.S
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Syscall restart trampoline for 32 and 64 bits processes.
+ *
+ * Copyright (C) 2018-2022 Helge Deller <deller@gmx.de>
+ * Copyright (C) 2022 John David Anglin <dave.anglin@bell.net>
+ */
+
+#include <asm/unistd.h>
+#include <asm/vdso.h>
+
+#include <linux/linkage.h>
+
+ .text
+
+ENTRY_CFI(__kernel_restart_syscall)
+ /*
+ * Setup a trampoline to restart the syscall
+ * with __NR_restart_syscall
+ */
+
+ /* load return pointer */
+#if defined(__VDSO64__)
+ ldd 0(%sp), %r31
+#elif defined(__VDSO32__)
+ ldw 0(%sp), %r31
+#endif
+
+ be 0x100(%sr2, %r0)
+ ldi __NR_restart_syscall, %r20
+
+ENDPROC_CFI(__kernel_restart_syscall)