From 22b08dbf32e9c5de1f10c19897422168100fa639 Mon Sep 17 00:00:00 2001
From: Mistivia <i@mistivia.com>
Date: Sat, 7 Dec 2024 18:02:04 +0800
Subject: add README for exmaples

---
 examples/README.md |  7 +++++++
 examples/fibo.asm  | 10 +++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 examples/README.md

diff --git a/examples/README.md b/examples/README.md
new file mode 100644
index 0000000..4a9a530
--- /dev/null
+++ b/examples/README.md
@@ -0,0 +1,7 @@
+## Assemble
+
+    ../assembler/fvm-as fibo.asm fibo.bin
+
+## Run
+
+    ./fvm fibo.bin
diff --git a/examples/fibo.asm b/examples/fibo.asm
index a1a3e82..7aa0cb9 100644
--- a/examples/fibo.asm
+++ b/examples/fibo.asm
@@ -1,13 +1,20 @@
-    imm 40
+    ;; fibo(30)
+    imm 30
     fibo rel call
+    ;; pop arguments and push return value to stack
     pop rv
+    ;; call print_number (syscall number is 1)
     imm 1 syscall
     exit
 fibo:
+    ;; setup stack pointer and base pointer
     bp sp sbp
+    ;; get first argument
     imm 2 bpick
+    ;; if (x > 2) then
     imm 2 gt
     .else rel jz
+    ;; return fibo(x - 2) + fibo(x - 1)
     imm 2 bpick
     imm 1 sub
     fibo rel call
@@ -19,6 +26,7 @@ fibo:
     srv
     .end rel jmp
 .else:
+    ;; else return 1
     imm 1 srv
     .end rel jmp
 .end:
-- 
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