Added assembler instructions

src/asm/Assembler.go

@@ -0,0 +1,8 @@
+package asm
+
+import "bytes"
+
+type Assembler struct {
+	Code bytes.Buffer
+	Data bytes.Buffer
+}

src/asm/x64/AppendUint32.go

@@ -0,0 +1,11 @@
+package x64
+
+import "io"
+
+// AppendUint32 appends a 32 bit number in Little Endian to the given writer.
+func AppendUint32(w io.ByteWriter, number uint32) {
+	w.WriteByte(byte(number))
+	w.WriteByte(byte(number >> 8))
+	w.WriteByte(byte(number >> 16))
+	w.WriteByte(byte(number >> 24))
+}

src/asm/x64/MoveRegNum32.go

@@ -0,0 +1,10 @@
+package x64
+
+import (
+	"io"
+)
+
+func MoveRegNum32(w io.ByteWriter, register byte, number uint32) {
+	w.WriteByte(0xb8 + register)
+	AppendUint32(w, number)
+}

src/asm/x64/Syscall.go

@@ -0,0 +1,10 @@
+package x64
+
+import (
+	"io"
+)
+
+func Syscall(w io.ByteWriter) {
+	w.WriteByte(0x0f)
+	w.WriteByte(0x05)
+}

src/build/Build.go

@@ -2,23 +2,24 @@ package build
 
 import (
 	"bufio"
-	"bytes"
 	"os"
 	"path/filepath"
 	"strings"
 
+	"git.akyoto.dev/cli/q/src/asm"
+	"git.akyoto.dev/cli/q/src/asm/x64"
 	"git.akyoto.dev/cli/q/src/directory"
 	"git.akyoto.dev/cli/q/src/elf"
 	"git.akyoto.dev/cli/q/src/errors"
 	"git.akyoto.dev/cli/q/src/log"
+	"git.akyoto.dev/cli/q/src/register"
+	"git.akyoto.dev/cli/q/src/syscall"
 )
 
 // Build describes a compiler build.
 type Build struct {
 	Name            string
 	Directory       string
-	Code            bytes.Buffer
-	Data            bytes.Buffer
 	WriteExecutable bool
 }
 
@@ -39,11 +40,26 @@ func (build *Build) Run() error {
 		return err
 	}
 
-	if build.WriteExecutable {
-		return writeToDisk(build.Executable(), build.Code.Bytes(), build.Data.Bytes())
+	if !build.WriteExecutable {
+		return nil
 	}
 
-	return nil
+	final := asm.Assembler{}
+	code := &final.Code
+	data := &final.Data
+
+	x64.MoveRegNum32(code, register.Syscall0, syscall.Write)
+	x64.MoveRegNum32(code, register.Syscall1, 1)
+	x64.MoveRegNum32(code, register.Syscall2, 0x4000a2)
+	x64.MoveRegNum32(code, register.Syscall3, 6)
+	x64.Syscall(code)
+
+	x64.MoveRegNum32(code, register.Syscall0, syscall.Exit)
+	x64.MoveRegNum32(code, register.Syscall1, 0)
+	x64.Syscall(code)
+
+	data.WriteString("Hello\n")
+	return writeToDisk(build.Executable(), code.Bytes(), data.Bytes())
 }
 
 // Compile compiles all the functions.
@@ -66,19 +82,6 @@ func (build *Build) Compile() error {
 		log.Info.Println(file)
 	})
 
-	build.Code.Write([]byte{
-		0xb8, 0x01, 0x00, 0x00, 0x00, // mov eax, 1
-		0xbf, 0x01, 0x00, 0x00, 0x00, // mov edi, 1
-		0xbe, 0xa2, 0x00, 0x40, 0x00, // mov esi, 0x4000a2
-		0xba, 0x06, 0x00, 0x00, 0x00, // mov edx, 6
-		0x0f, 0x05, // syscall
-
-		0xb8, 0x3c, 0x00, 0x00, 0x00, // mov eax, 60
-		0xbf, 0x00, 0x00, 0x00, 0x00, // mov edi, 0
-		0x0f, 0x05, // syscall
-	})
-
-	build.Data.Write([]byte{'H', 'e', 'l', 'l', 'o', '\n'})
 	return nil
 }
 

src/elf/Header.go

@@ -5,8 +5,7 @@ const (
 	TypeExecutable    = 2
 	ArchitectureAMD64 = 0x3E
 	HeaderSize        = 64
-	CacheLineSize     = 64
-	Align             = CacheLineSize
+	Align             = 16
 )
 
 // Header contains general information.

src/register/General.go

@@ -0,0 +1,20 @@
+package register
+
+const (
+	R0 = iota
+	R1
+	R2
+	R3
+	R4
+	R5
+	R6
+	R7
+	R8
+	R9
+	R10
+	R11
+	R12
+	R13
+	R14
+	R15
+)

src/register/Named.go

@@ -0,0 +1,12 @@
+package register
+
+const (
+	RAX = R0
+	RCX = R1
+	RDX = R2
+	RBX = R3
+	RSP = R4
+	RBP = R5
+	RSI = R6
+	RDI = R7
+)

src/register/Syscall_amd64.go

@@ -0,0 +1,11 @@
+package register
+
+const (
+	Syscall0 = R0
+	Syscall1 = R7
+	Syscall2 = R6
+	Syscall3 = R2
+	Syscall4 = R10
+	Syscall5 = R8
+	Syscall6 = R9
+)

src/syscall/syscall_linux.go

@@ -0,0 +1,333 @@
+package syscall
+
+const (
+	Read = iota
+	Write
+	Open
+	Close
+	Stat
+	Fstat
+	Lstat
+	Poll
+	Lseek
+	Mmap
+	Mprotect
+	Munmap
+	Brk
+	Rt_sigaction
+	Rt_sigprocmask
+	Rt_sigreturn
+	Ioctl
+	Pread64
+	Pwrite64
+	Readv
+	Writev
+	Access
+	Pipe
+	Select
+	Sched_yield
+	Mremap
+	Msync
+	Mincore
+	Madvise
+	Shmget
+	Shmat
+	Shmctl
+	Dup
+	Dup2
+	Pause
+	Nanosleep
+	Getitimer
+	Alarm
+	Setitimer
+	Getpid
+	Sendfile
+	Socket
+	Connect
+	Accept
+	Sendto
+	Recvfrom
+	Sendmsg
+	Recvmsg
+	Shutdown
+	Bind
+	Listen
+	Getsockname
+	Getpeername
+	Socketpair
+	Setsockopt
+	Getsockopt
+	Clone
+	Fork
+	Vfork
+	Execve
+	Exit
+	Wait4
+	Kill
+	Uname
+	Semget
+	Semop
+	Semctl
+	Shmdt
+	Msgget
+	Msgsnd
+	Msgrcv
+	Msgctl
+	Fcntl
+	Flock
+	Fsync
+	Fdatasync
+	Truncate
+	Ftruncate
+	Getdents
+	Getcwd
+	Chdir
+	Fchdir
+	Rename
+	Mkdir
+	Rmdir
+	Creat
+	Link
+	Unlink
+	Symlink
+	Readlink
+	Chmod
+	Fchmod
+	Chown
+	Fchown
+	Lchown
+	Umask
+	Gettimeofday
+	Getrlimit
+	Getrusage
+	Sysinfo
+	Times
+	Ptrace
+	Getuid
+	Syslog
+	Getgid
+	Setuid
+	Setgid
+	Geteuid
+	Getegid
+	Setpgid
+	Getppid
+	Getpgrp
+	Setsid
+	Setreuid
+	Setregid
+	Getgroups
+	Setgroups
+	Setresuid
+	Getresuid
+	Setresgid
+	Getresgid
+	Getpgid
+	Setfsuid
+	Setfsgid
+	Getsid
+	Capget
+	Capset
+	Rt_sigpending
+	Rt_sigtimedwait
+	Rt_sigqueueinfo
+	Rt_sigsuspend
+	Sigaltstack
+	Utime
+	Mknod
+	Uselib
+	Personality
+	Ustat
+	Statfs
+	Fstatfs
+	Sysfs
+	Getpriority
+	Setpriority
+	Sched_setparam
+	Sched_getparam
+	Sched_setscheduler
+	Sched_getscheduler
+	Sched_get_priority_max
+	Sched_get_priority_min
+	Sched_rr_get_interval
+	Mlock
+	Munlock
+	Mlockall
+	Munlockall
+	Vhangup
+	Modify_ldt
+	Pivot_root
+	Sysctl
+	Prctl
+	Arch_prctl
+	Adjtimex
+	Setrlimit
+	Chroot
+	Sync
+	Acct
+	Settimeofday
+	Mount
+	Umount2
+	Swapon
+	Swapoff
+	Reboot
+	Sethostname
+	Setdomainname
+	Iopl
+	Ioperm
+	Create_module
+	Init_module
+	Delete_module
+	Get_kernel_syms
+	Query_module
+	Quotactl
+	Nfsservctl
+	Getpmsg
+	Putpmsg
+	Afs_syscall
+	Tuxcall
+	Security
+	Gettid
+	Readahead
+	Setxattr
+	Lsetxattr
+	Fsetxattr
+	Getxattr
+	Lgetxattr
+	Fgetxattr
+	Listxattr
+	Llistxattr
+	Flistxattr
+	Removexattr
+	Lremovexattr
+	Fremovexattr
+	Tkill
+	Time
+	Futex
+	Sched_setaffinity
+	Sched_getaffinity
+	Set_thread_area
+	Io_setup
+	Io_destroy
+	Io_getevents
+	Io_submit
+	Io_cancel
+	Get_thread_area
+	Lookup_dcookie
+	Epoll_create
+	Epoll_ctl_old
+	Epoll_wait_old
+	Remap_file_pages
+	Getdents64
+	Set_tid_address
+	Restart_syscall
+	Semtimedop
+	Fadvise64
+	Timer_create
+	Timer_settime
+	Timer_gettime
+	Timer_getoverrun
+	Timer_delete
+	Clock_settime
+	Clock_gettime
+	Clock_getres
+	Clock_nanosleep
+	Exit_group
+	Epoll_wait
+	Epoll_ctl
+	Tgkill
+	Utimes
+	Vserver
+	Mbind
+	Set_mempolicy
+	Get_mempolicy
+	Mq_open
+	Mq_unlink
+	Mq_timedsend
+	Mq_timedreceive
+	Mq_notify
+	Mq_getsetattr
+	Kexec_load
+	Waitid
+	Add_key
+	Request_key
+	Keyctl
+	Ioprio_set
+	Ioprio_get
+	Inotify_init
+	Inotify_add_watch
+	Inotify_rm_watch
+	Migrate_pages
+	Openat
+	Mkdirat
+	Mknodat
+	Fchownat
+	Futimesat
+	Newfstatat
+	Unlinkat
+	Renameat
+	Linkat
+	Symlinkat
+	Readlinkat
+	Fchmodat
+	Faccessat
+	Pselect6
+	Ppoll
+	Unshare
+	Set_robust_list
+	Get_robust_list
+	Splice
+	Tee
+	Sync_file_range
+	Vmsplice
+	Move_pages
+	Utimensat
+	Epoll_pwait
+	Signalfd
+	Timerfd_create
+	Eventfd
+	Fallocate
+	Timerfd_settime
+	Timerfd_gettime
+	Accept4
+	Signalfd4
+	Eventfd2
+	Epoll_create1
+	Dup3
+	Pipe2
+	Inotify_init1
+	Preadv
+	Pwritev
+	Rt_tgsigqueueinfo
+	Perf_event_open
+	Recvmmsg
+	Fanotify_init
+	Fanotify_mark
+	Prlimit64
+	Name_to_handle_at
+	Open_by_handle_at
+	Clock_adjtime
+	Syncfs
+	Sendmmsg
+	Setns
+	Getcpu
+	Process_vm_readv
+	Process_vm_writev
+	Kcmp
+	Finit_module
+	Sched_setattr
+	Sched_getattr
+	Renameat2
+	Seccomp
+	Getrandom
+	Memfd_create
+	Kexec_file_load
+	Bpf
+	Stub_execveat
+	Userfaultfd
+	Membarrier
+	Mlock2
+	Copy_file_range
+	Preadv2
+	Pwritev2
+)