From 596c5ec5d487625c6674864464f3f7780f709c72 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20A=2E=20Ortega?=
 <deathsbreed@themusicinnoise.net>
Date: Mon, 10 Apr 2017 21:52:41 +0200
Subject: [PATCH] Almost have an x86_64 assembly example working.

---
 .gitignore          |  1 +
 Makefile            | 14 +++++++--
 src/main-x86_64.asm | 74 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+), 3 deletions(-)
 create mode 100644 src/main-x86_64.asm

diff --git a/.gitignore b/.gitignore
index c45d290..e55bbfd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 # Ignore builds
 bin/
+*.o
diff --git a/Makefile b/Makefile
index 795f32e..96d09bc 100644
--- a/Makefile
+++ b/Makefile
@@ -21,10 +21,12 @@
 #    distribution.
 
 # Compilers
+ASM=as
 CC=gcc
 CXX=g++
-JAVAC=javac
+LD=ld
 FTR=gfortran
+JAVAC=javac
 
 # Other commands
 RM=rm -rf
@@ -32,7 +34,13 @@ RM=rm -rf
 # Directories
 BINDIR=bin
 
-all: c cpp fortran java
+all: x86-64asm c cpp fortran java
+
+x86-64asm:
+	mkdir -p $(BINDIR)
+	$(ASM) -o src/main-x86_64.o src/main-x86_64.asm
+	$(LD) -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o \
+		$(BINDIR)/doublesgame-x86_64asm src/main-x86_64.o -lc
 
 c:
 	mkdir -p $(BINDIR)
@@ -52,4 +60,4 @@ java:
 
 .PHONY: clean
 clean:
-	$(RM) $(BINDIR)
+	$(RM) src/*.o
diff --git a/src/main-x86_64.asm b/src/main-x86_64.asm
new file mode 100644
index 0000000..9df48ec
--- /dev/null
+++ b/src/main-x86_64.asm
@@ -0,0 +1,74 @@
+# Copyright (C) 2017 Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net> All rights reserved.
+# Author: Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net>
+#
+# This software is provided 'as-is', without any express or implied
+# warranty. In no event will the authors be held liable for any damages
+# arising from the use of this software.
+#
+# Permission is granted to anyone to use this software for any purpose,
+# including commercial applications, and to alter it and redistribute it
+# freely, subject to the following restrictions:
+#
+# 1. The origin of this software must not be misrepresented; you must not
+#    claim that you wrote the original software. If you use this software
+#    in a product, an acknowledgment in the product documentation would be
+#    appreciated but is not required.
+#
+# 2. Altered source versions must be plainly marked as such, and must not be
+#    misrepresented as being the original software.
+#
+# 3. This notice may not be removed or altered from any source
+#    distribution.
+#
+.section .data
+equation:
+	.ascii "2^%d=\0"
+query:
+	.ascii "%d\0"
+goodbye:
+	.ascii "Goodbye!\0"
+tryagain:
+	.ascii "Wrong answer, try again.\0"
+correct:
+	.ascii "Correct!\0"
+number:
+	.int 1
+answer:
+	.int 0
+
+.section .text
+	.globl _start
+
+_start:
+	mov number, %rsi
+	mov $equation, %rdi
+	call printf
+
+	mov $query, %rdi
+	mov $answer, %rsi
+	call scanf
+	cmp $0, answer
+	je quit
+
+	mov number, %rsi
+	shl $1, %rsi
+	cmp %rdi, answer
+	je next
+
+	mov $tryagain, %rdi
+	call puts
+	jmp _start
+
+next:
+	mov $correct, %rdi
+	call puts
+	mov number, %rax
+	inc %rax
+	mov %rax, number
+	jmp _start
+
+quit:
+	mov $goodbye, %rdi
+	call puts
+	mov $0, %rdi
+	call exit