feat: Sully.s buffer functions

Makefile

@@ -11,6 +11,8 @@ COLLEEN_ASM_SRCS = $(SRC_DIR)/Colleen/Colleen.s
 COLLEEN_ASM = Colleen_asm
 GRACE_ASM_SRCS = $(SRC_DIR)/Grace/Grace.s
 GRACE_ASM = Grace_asm
+SULLY_ASM_SRCS = $(SRC_DIR)/Sully/Sully.s
+SULLY_ASM = Sully_asm
 NASM = nasm
 NASMFLAGS = -f elf64
 LD = ld
@@ -36,9 +38,10 @@ SULLY_DEPS = $(SULLY_OBJS:.o=.d)
 
 COLLEEN_ASM_OBJS = $(COLLEEN_ASM_SRCS:$(SRC_DIR)/%.s=$(OBJ_DIR)/%.asm.o)
 GRACE_ASM_OBJS = $(GRACE_ASM_SRCS:$(SRC_DIR)/%.s=$(OBJ_DIR)/%.asm.o)
+SULLY_ASM_OBJS = $(SULLY_ASM_SRCS:$(SRC_DIR)/%.s=$(OBJ_DIR)/%.asm.o)
 
 .PHONY: all
-all: $(COLLEEN) $(GRACE) $(SULLY) $(COLLEEN_ASM) $(GRACE_ASM)
+all: $(COLLEEN) $(GRACE) $(SULLY) $(COLLEEN_ASM) $(GRACE_ASM) $(SULLY_ASM)
 
 $(GRACE): $(GRACE_OBJS)
 	$(CC) $(LDFLAGS) -o $@ $^
@@ -55,6 +58,9 @@ $(COLLEEN_ASM): $(COLLEEN_ASM_OBJS)
 $(GRACE_ASM): $(GRACE_ASM_OBJS)
 	$(LD) -o $@ $^
 
+$(SULLY_ASM): $(SULLY_ASM_OBJS)
+	$(LD) -o $@ $^
+
 $(OBJ_DIR)/%.o: $(SRC_DIR)/%.c
 	@mkdir -p $(dir $@)
 	$(CC) $(CPPFLAGS) $(CFLAGS) -MMD -MP -c $< -o $@
@@ -73,7 +79,7 @@ clean:
 
 .PHONY: fclean
 fclean: clean
-	$(RM) $(COLLEEN) $(GRACE) $(SULLY) $(COLLEEN_ASM) $(GRACE_ASM)
+	$(RM) $(COLLEEN) $(GRACE) $(SULLY) $(COLLEEN_ASM) $(GRACE_ASM) $(SULLY)
 
 .PHONY: re
 re: fclean

src/Sully/Sully.s

@@ -0,0 +1,118 @@
+global _start
+
+section .rodata
+src: db "Hello world", 0
+src_len: equ $ - src
+sep: db ", "
+zero_str: db "0"
+flags: dq 578
+i: db 5 + "0"
+
+section .bss
+%define BUFF_SIZE 8
+
+align BUFF_SIZE
+buffer: resb BUFF_SIZE
+
+section .data
+fd: dq 1
+buff_len: dd 0
+filename: db "Sully_x.s", 0
+
+section .text
+
+%macro EXIT 1
+	mov rdi, %1
+	mov eax, 60 ; SYS_EXIT
+	syscall
+%endmacro
+
+open_sully:
+	mov al, byte [rel i] ; load i in al
+	mov byte [rel filename + 6], al ; filename[6] = al
+
+	mov rax, 2 ; SYS_OPEN
+	lea rdi, [rel filename] ; set filename
+	mov rsi, [rel flags] ; set flags
+	mov rdx, 0664o ; set perm
+	syscall
+	cmp rax, 0 ; if -errno
+	jl .done
+	mov [rel fd], rax ; fd = open(filename, flags, 0644)
+	.done:
+	ret
+
+flush_buff:
+	cmp [rel buff_len], 0
+	jz .done
+	mov eax, 1					; SYS_WRITE
+	mov edi, [rel fd]			; set fd
+	lea rsi, [rel buffer]		; set addr
+	mov edx, [rel buff_len]		; set len
+	syscall						; write( fd, addr, len )
+	mov dword [rel buff_len], 0	; buff_len = 0
+	.done:
+	ret
+
+
+; param: al = byte to add
+add_to_buff:
+	mov r9d, dword [rel buff_len] ; r9d = buff_len
+	cmp r9d, BUFF_SIZE; if buff_len >= BUFF_SIZE
+	jge .flush
+
+	.add_char:
+	lea r10, [rel buffer] ; r10 = &buffer
+	add r10, r9 ; r10 += buff_len
+	mov byte [r10], al; buffer[buff_len] = al
+
+	inc dword [rel buff_len] ; ++buff_len
+	ret
+
+	.flush:
+	push rax ; save char
+	call flush_buff
+	pop rax ; restor char
+	xor r9d, r9d ; sync r9d with buff_len
+	jmp .add_char
+
+
+_start:
+	;mov dword [rel buff_len], 1
+	;mov byte [rel buffer], 126 
+	;call flush_buff
+
+	call open_sully
+	cmp rax, 0
+	jl .exit ; if -errno
+
+	push r14; int i
+	xor r14, r14 ; i = 0
+	; while r14 (i) <= src_len
+	.loop:
+	cmp r14, src_len
+	jge .ldone
+
+	; move src[r14] in al
+	lea rsi, [rel src]
+	add rsi, r14
+	movzx eax, byte [rsi]
+
+	; add al to buff
+	call add_to_buff
+
+	inc r14	
+	jmp .loop
+	.ldone:
+	pop r14; release i
+
+	call flush_buff
+
+
+	; close(fd)
+	mov rdi, [rel fd]
+	mov eax, 3
+	syscall
+
+	.exit:	
+	EXIT rax