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-rw-r--r--arch/arm/lib/setjmp.S37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm/lib/setjmp.S b/arch/arm/lib/setjmp.S
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+++ b/arch/arm/lib/setjmp.S
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+/*
+ * (C) 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm/assembler.h>
+#include <linux/linkage.h>
+
+.pushsection .text.setjmp, "ax"
+ENTRY(setjmp)
+ /*
+ * A subroutine must preserve the contents of the registers
+ * r4-r8, r10, r11 (v1-v5, v7 and v8) and SP (and r9 in PCS
+ * variants that designate r9 as v6).
+ */
+ mov ip, sp
+ stm a1, {v1-v8, ip, lr}
+ mov a1, #0
+ bx lr
+ENDPROC(setjmp)
+.popsection
+
+.pushsection .text.longjmp, "ax"
+ENTRY(longjmp)
+ ldm a1, {v1-v8, ip, lr}
+ mov sp, ip
+ mov a1, a2
+ /* If we were passed a return value of zero, return one instead */
+ cmp a1, #0
+ bne 1f
+ mov a1, #1
+1:
+ bx lr
+ENDPROC(longjmp)
+.popsection