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Diffstat (limited to 'arch/arm/lib/setjmp_aarch64.S')
-rw-r--r--arch/arm/lib/setjmp_aarch64.S42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/arm/lib/setjmp_aarch64.S b/arch/arm/lib/setjmp_aarch64.S
new file mode 100644
index 0000000000..b68edb86d6
--- /dev/null
+++ b/arch/arm/lib/setjmp_aarch64.S
@@ -0,0 +1,42 @@
+/*
+ * (C) 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm/macro.h>
+#include <linux/linkage.h>
+
+.pushsection .text.setjmp, "ax"
+ENTRY(setjmp)
+ /* Preserve all callee-saved registers and the SP */
+ stp x19, x20, [x0,#0]
+ stp x21, x22, [x0,#16]
+ stp x23, x24, [x0,#32]
+ stp x25, x26, [x0,#48]
+ stp x27, x28, [x0,#64]
+ stp x29, x30, [x0,#80]
+ mov x2, sp
+ str x2, [x0, #96]
+ mov x0, #0
+ ret
+ENDPROC(setjmp)
+.popsection
+
+.pushsection .text.longjmp, "ax"
+ENTRY(longjmp)
+ ldp x19, x20, [x0,#0]
+ ldp x21, x22, [x0,#16]
+ ldp x23, x24, [x0,#32]
+ ldp x25, x26, [x0,#48]
+ ldp x27, x28, [x0,#64]
+ ldp x29, x30, [x0,#80]
+ ldr x2, [x0,#96]
+ mov sp, x2
+ /* Move the return value in place, but return 1 if passed 0. */
+ adds x0, xzr, x1
+ csinc x0, x0, xzr, ne
+ ret
+ENDPROC(longjmp)
+.popsection