arm64: Implement setjmp/longjmp.

Change-Id: I9cd2d5de27a3b110b185c658e980428fe49392b0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5267
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: David Karoly <[email protected]>
Reviewed-by: waddlesplash <[email protected]>

src/system/libroot/posix/arch/arm64/siglongjmp.S

@@ -11,9 +11,17 @@
 FUNCTION(siglongjmp):
 FUNCTION(longjmp):
 FUNCTION(_longjmp):
-	/* Loop infinitely here, for now.
+	ldp x19, x20, [x0], #16
-	 TODO implement this for real */
+	ldp x21, x22, [x0], #16
-	b		.
+	ldp x23, x24, [x0], #16
+	ldp x25, x26, [x0], #16
+	ldp x27, x28, [x0], #16
+	ldp x29, x30, [x0], #16
+
+	ldr x2, [x0]
+	mov sp, x2
+
+	b __longjmp_return
 FUNCTION_END(siglongjmp)
 FUNCTION_END(longjmp)
 FUNCTION_END(_longjmp)

src/system/libroot/posix/arch/arm64/sigsetjmp.S

@@ -8,7 +8,17 @@
 /* int sigsetjmp(jmp_buf buffer, int saveMask) */
 FUNCTION(__sigsetjmp):
 FUNCTION(sigsetjmp):
-	b	.
+	stp x19, x20, [x0], #16
+	stp x21, x22, [x0], #16
+	stp x23, x24, [x0], #16
+	stp x25, x26, [x0], #16
+	stp x27, x28, [x0], #16
+	stp x29, x30, [x0], #16
+
+	mov x2, sp
+	str x2, [x0]
+
+	b __setjmp_save_sigs
 FUNCTION_END(sigsetjmp)
 FUNCTION_END(__sigsetjmp)
 
@@ -16,7 +26,9 @@ FUNCTION_END(__sigsetjmp)
 /* int setjmp(jmp_buf buffer) */
 FUNCTION(setjmp):
 FUNCTION(_setjmp):
-	b	.
+	mov x1, #0
+	b __sigsetjmp
+FUNCTION_END(_setjmp)
 FUNCTION_END(setjmp)
 
 #pragma weak _setjmp=setjmp