1 files changed, 11 insertions, 3 deletions
diff --git a/coroutine/arm32/Context.S b/coroutine/arm32/Context.S
index c2b93d0a34..4308e1d1d2 100644
--- a/coroutine/arm32/Context.S
+++ b/coroutine/arm32/Context.S
@@ -9,6 +9,14 @@
 
 .globl coroutine_transfer
 coroutine_transfer:
-	stmia r1!, {r4-r11,sp,lr}
-	ldmia r0!, {r4-r11,sp,pc}
-	bx lr
+	# Save caller state (8 registers + return address)
+	push {r4-r11,lr}
+	
+	# Save caller stack pointer
+	str sp, [r0]
+	
+	# Restore callee stack pointer
+	ldr sp, [r1]
+	
+	# Restore callee state (8 registers program counter)
+	pop {r4-r11,pc}