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Author: asyncze

Assembly/x86/_hello

@@ -0,0 +1,9 @@
+// gcc _hello.c -S -O0 -masm=intel -fno-stack-protector
+
+#include <unistd.h>
+
+int main() {
+	const char message[] = "hello assembly";
+	syscall(4, STDOUT_FILENO, message, sizeof(message) - 1);
+	return 0;
+}

Assembly/x86/_hello.c

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+	.section	__TEXT,__text,regular,pure_instructions
+	.build_version macos, 13, 0	sdk_version 13, 3
+	.intel_syntax noprefix
+	.globl	_main                           ## -- Begin function main
+	.p2align	4, 0x90
+_main:                                  ## @main
+	.cfi_startproc
+## %bb.0:
+	push	rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset rbp, -16
+	mov	rbp, rsp
+	.cfi_def_cfa_register rbp
+	sub	rsp, 32
+	mov	dword ptr [rbp - 4], 0
+	mov	rax, qword ptr [rip + L___const.main.message]
+	mov	qword ptr [rbp - 19], rax
+	mov	eax, dword ptr [rip + L___const.main.message+8]
+	mov	dword ptr [rbp - 11], eax
+	mov	ax, word ptr [rip + L___const.main.message+12]
+	mov	word ptr [rbp - 7], ax
+	mov	al, byte ptr [rip + L___const.main.message+14]
+	mov	byte ptr [rbp - 5], al
+	lea	rdx, [rbp - 19]
+	mov	edi, 4
+	mov	esi, 1
+	mov	ecx, 14
+	mov	al, 0
+	call	_syscall
+	xor	eax, eax
+	add	rsp, 32
+	pop	rbp
+	ret
+	.cfi_endproc
+                                        ## -- End function
+	.section	__TEXT,__cstring,cstring_literals
+L___const.main.message:                 ## @__const.main.message
+	.asciz	"hello assembly"
+
+.subsections_via_symbols

Assembly/x86/_hello.s

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+; 2021-05
+; x86-64 (intel syntax)
+    section .text
+    global _main
+
+_main:
+    mov rax, 0x02000004     ; write (4)
+    mov rdi, 1              ; stdout
+    mov rsi, message        ; address of output
+    mov rdx, 10             ; bytes : "hello x86" + /n = 10
+    syscall                 ; invoke write
+    mov rax, 0x02000001     ; exit (1)
+    xor rdi, rdi            ; 0
+    syscall                 ; invoke to exit
+
+    section .data
+
+message:
+    db "hello x86", 10      ; define byte : text, \n (10)
+
+; $ nasm -f macho64 hello-x86.asm 
+; $ ld hello-x86.o -o _hello -lSystem -L/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib
+; $ ./_hello
+; hello x86

Assembly/x86/hello-x86.asm

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+#include <iostream>
+#include <fstream>
+#include <ctime>
+#include <string>
+#include <cmath>
+#include <algorithm>
+#include <csignal>
+#include <vector>
+// sleep
+#include <unistd.h>
+// multithreading
+#include <pthread.h>
+
+using namespace std;
+
+int main(int argc, char** argv) {
+    
+
+    return 0;
+}