From afda6f12adf869ca9b35eae215b2aa83b87de39a Mon Sep 17 00:00:00 2001
From: Matt Turner <mattst88@gmail.com>
Date: Wed, 2 Jan 2008 03:55:22 +0000
Subject: Initial import.

git-svn-id: svn://mattst88.com/svn/x86_64-assembly/trunk@1 a323887f-d61c-418c-83a5-2e06a2a01087
---
 factorial.asm | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 factorial.asm

(limited to 'factorial.asm')

diff --git a/factorial.asm b/factorial.asm
new file mode 100644
index 0000000..612d5e9
--- /dev/null
+++ b/factorial.asm
@@ -0,0 +1,46 @@
+format ELF64
+
+extrn	printf
+extrn	scanf
+extrn	puts
+public	main
+
+section '.text' executable
+
+main:	push	rbp
+	mov	rbp,rsp
+	
+	mov	edi,prompt
+	call	puts
+
+	sub	rsp,16
+	
+	mov	rsi,rsp
+	mov	edi,scan
+	xor	eax,eax
+	call	scanf
+
+	mov	rax,[rsp]
+	
+	add	rsp,16
+	
+	mov	rsi,rax
+	lea	rcx,[rax-1]
+top:	mul	rcx
+	sub	rcx,1
+	jnz	top
+	
+print:	mov	edi,msg
+	mov	rdx,rax
+	xor	eax,eax
+	call	printf
+	
+	leave
+	ret
+	
+
+section '.data' writable
+
+msg	db	"Factorial of %d is %d",0xA,0
+scan	db	"%d",0
+prompt	db	"Enter an unsigned integer.",0
-- 
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