├── .gitignore
└── main.c


/.gitignore:
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1 | simpleio
2 | 


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/main.c:
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 1 | // Hello world without using stdio.
 2 | 
 3 | void print(char* msg, long length) {
 4 | 	asm("movq $4, %%rax\n\t"
 5 | 		"movq $1, %%rbx\n\t"
 6 | 		"movq %0, %%rcx\n\t"
 7 | 		"movq %1, %%rdx\n\t"
 8 | 		"int $0x80"
 9 | 		:
10 | 		: "r" (msg), "r" (length)
11 | 		: "%rax", "%rbx", "%rcx", "%rdx");
12 | }
13 | 
14 | int main() {
15 | 	print("Hello world!\n", 13);
16 | }
17 | 


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