From 1ee35701fc18883afee72dd80251f74f78fa0e75 Mon Sep 17 00:00:00 2001
From: overflowerror <mail@overfloweror.com>
Date: Sat, 22 Aug 2020 19:33:55 +0200
Subject: [PATCH] added 32 bit asm version

---
 asm/Makefile  |  6 ++++++
 asm/fib32.asm | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 asm/Makefile
 create mode 100644 asm/fib32.asm

diff --git a/asm/Makefile b/asm/Makefile
new file mode 100644
index 0000000..7e44f28
--- /dev/null
+++ b/asm/Makefile
@@ -0,0 +1,6 @@
+
+all: fib32
+
+fib32: fib32.asm
+	nasm -f elf32 fib32.asm
+	gcc -m32 -no-pie fib32.o -o $@
diff --git a/asm/fib32.asm b/asm/fib32.asm
new file mode 100644
index 0000000..a9ecc79
--- /dev/null
+++ b/asm/fib32.asm
@@ -0,0 +1,57 @@
+section .text
+
+global main
+extern printf
+
+fib:
+	pop	ebx
+	pop	ecx
+	pop	eax
+	pop	edx
+	sub	esp, 12
+	push	ebx
+
+	cmp	ecx, 0
+	je	fibend
+		
+fibloop:
+	mov	ebx, eax
+	add	ebx, edx
+
+	push	ecx ; ecx is not callee-saved in the linux abi
+
+	push	ebx
+	push	edx
+	push	eax
+	push	format
+
+	call	printf
+
+	add	esp, 8
+	pop	eax
+	pop	edx
+
+	pop	ecx
+
+	dec	ecx
+	jnz	fibloop
+fibend:
+	ret
+
+main:
+	mov	ebx, 1
+	push	ebx
+	push	ebx
+	mov	ebx, 5
+	push	ebx
+
+	call	fib
+
+	add	esp, 12
+
+	mov	eax, 0 ; return 0
+	ret
+
+section .data
+format:
+	db '%d + %d = %d', 10, 0