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authorRouven Czerwinski <r.czerwinski@pengutronix.de>2020-01-28 06:38:19 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2020-01-30 06:22:28 +0100
commit7e73f9a3b89dcabb5737e2989ede1f7558dff9f1 (patch)
tree35f28f12e865e22c7aa9d3a9d7e7f23c2e2c7188 /arch/arm/lib32
parentc3474d0f77324a15c503551dc79fdf2ef891876f (diff)
downloadbarebox-7e73f9a3b89dcabb5737e2989ede1f7558dff9f1.tar.gz
barebox-7e73f9a3b89dcabb5737e2989ede1f7558dff9f1.tar.xz
ARM: import setjmp implementation from U-Boot
Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/lib32')
-rw-r--r--arch/arm/lib32/Makefile2
-rw-r--r--arch/arm/lib32/setjmp.S36
2 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/lib32/Makefile b/arch/arm/lib32/Makefile
index cd43147e66..cfcf3bc8f1 100644
--- a/arch/arm/lib32/Makefile
+++ b/arch/arm/lib32/Makefile
@@ -28,3 +28,5 @@ extra-y += barebox.lds
pbl-y += lib1funcs.o
pbl-y += ashldi3.o
pbl-y += div0.o
+
+obj-pbl-y += setjmp.o
diff --git a/arch/arm/lib32/setjmp.S b/arch/arm/lib32/setjmp.S
new file mode 100644
index 0000000000..f0606a7f66
--- /dev/null
+++ b/arch/arm/lib32/setjmp.S
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) 2017 Theobroma Systems Design und Consulting GmbH
+ */
+
+#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