1 files changed, 32 insertions, 0 deletions
diff --git a/tests/fixtures/stack.s b/tests/fixtures/stack.s
new file mode 100644
index 0000000..9b45785
--- /dev/null
+++ b/tests/fixtures/stack.s
@@ -0,0 +1,32 @@
+; STACK instruction example.
+;
+; Build/run from examples/:
+;   ../utils/mcpu-as -o stack.o stack.s
+;   ../utils/mcpu-ld --stack-size=128 -o stack stack.o
+;   ../utils/mcpu-run --int-reg=r64@0x00028 stack
+;
+; Expected output: 22
+;
+.text
+_start_life:
+        LDI     r64@0x00000, 11
+        LDI     r64@0x00008, 22
+
+        ; STACK grows downward.  cpu-run initializes SP to stack_size.
+        PUSH    r64@0x00000
+        PUSH    r64@0x00008
+
+        ; Current stack top contains 22, SP+8 contains 11.
+        LDSP    r64@0x00010, 8
+        STSP    0, r64@0x00000
+
+        POP     r64@0x00018
+        POP     r64@0x00020
+
+        ; Reserve a 16-byte local frame without automatic padding.
+        ADJSP   -16
+        STSP    0, r64@0x00008
+        LDSP    r64@0x00028, 0
+        ADJSP   16
+
+        HALT