[PATCH v3 03/16] ARM: asm: setjmp: implement coroutine dependency initjmp()

[Ahmad Fatoum]

Implement initjmp() for use with the incoming bthread support.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 arch/arm/Kconfig              | 1 +
 arch/arm/include/asm/setjmp.h | 2 ++
 arch/arm/lib32/setjmp.S       | 8 ++++++++
 arch/arm/lib64/setjmp.S       | 9 +++++++++
 4 files changed, 20 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ab0bf030131c..cdb934136e34 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -5,6 +5,7 @@ config ARM
 	select HAVE_CONFIGURABLE_TEXT_BASE if !RELOCATABLE
 	select HAVE_IMAGE_COMPRESSION
 	select HAVE_ARCH_KASAN
+	select HAS_ARCH_SJLJ
 	select ARM_OPTIMZED_STRING_FUNCTIONS if KASAN
 	default y
 
diff --git a/arch/arm/include/asm/setjmp.h b/arch/arm/include/asm/setjmp.h
index 538d9cd50651..4877e4312411 100644
--- a/arch/arm/include/asm/setjmp.h
+++ b/arch/arm/include/asm/setjmp.h
@@ -26,4 +26,6 @@ typedef struct jmp_buf_data jmp_buf[1];
 int setjmp(jmp_buf jmp) __attribute__((returns_twice));
 void longjmp(jmp_buf jmp, int ret) __attribute__((noreturn));
 
+int initjmp(jmp_buf jmp, void __noreturn (*func)(void), void *stack_top);
+
 #endif /* _SETJMP_H_ */
diff --git a/arch/arm/lib32/setjmp.S b/arch/arm/lib32/setjmp.S
index f0606a7f6659..626d915da183 100644
--- a/arch/arm/lib32/setjmp.S
+++ b/arch/arm/lib32/setjmp.S
@@ -33,4 +33,12 @@ ENTRY(longjmp)
 1:
 	bx   lr
 ENDPROC(longjmp)
+
+.pushsection .text.initjmp, "ax"
+ENTRY(initjmp)
+	str  a3, [a1, #32] /* stack pointer */
+	str  a2, [a1, #36] /* return address */
+	mov  a1, #0
+	bx   lr
+ENDPROC(initjmp)
 .popsection
diff --git a/arch/arm/lib64/setjmp.S b/arch/arm/lib64/setjmp.S
index 0910e2f5a6c3..80be8cb0f201 100644
--- a/arch/arm/lib64/setjmp.S
+++ b/arch/arm/lib64/setjmp.S
@@ -36,3 +36,12 @@ ENTRY(longjmp)
 	ret
 ENDPROC(longjmp)
 .popsection
+
+.pushsection .text.initjmp, "ax"
+ENTRY(initjmp)
+	str  x2, [x0, #96] /* stack pointer */
+	str  x1, [x0, #88] /* return address */
+	mov  x0, #0
+	ret
+ENDPROC(initjmp)
+.popsection
-- 
2.29.2