print_int: fix a bug where print_int clobbers registers

Author: h908714124

group3/.gdbinit

@@ -3,4 +3,4 @@ lay asm
 define hook-quit
 	set confirm off
 end
-break copy
+break print_lines_loop

group3/group3.s

@@ -17,7 +17,7 @@ in:
 	.quad	0
 out:
 	.quad	0
-line:
+linebuf:
 	.quad	0
 file_size:
 	.quad	0
@@ -36,6 +36,7 @@ file:
 
 get_memory:
 	enter
+	push_all
 	mov	$MMAP, %rax
 	mov	$0, %rdi		#addr
 	mov	$3, %rdx		#prot r=1 w=2
@@ -44,46 +45,56 @@ get_memory:
 	mov	$0, %r9			#offset
 	mov	$34, %r10		#flags map_private=0x02, map_anonymous=0x20
 	syscall
+	pop_all
 	return
 
 exit:
 	enter
+	push_all
 	mov	$EXIT, %rax
 	mov	$0, %rdi
 	syscall
+	pop_all
 	return
 
 open_file:
 	enter
+	push_all
 	mov	$OPEN, %rax
 	mov	$file, %rdi
 	mov	$0, %rsi
 	mov	$0644, %rdx
 	syscall
 	mov	%rax, fh(%rip)
+	pop_all
 	return
 
 stat_file:
 	enter
+	push_all
 	mov	$FSTAT, %rax
 	mov	fh(%rip), %rdi
 	lea	st, %rsi
 	syscall
 	mov	48(%rsi), %rbx
 	mov	%rbx, file_size(%rip)
+	pop_all
 	return
 
 init_file:
 	enter
+	push_all
 	mov	$READ, %rax
 	mov	fh(%rip), %rdi
 	mov	in(%rip), %rsi
 	mov	file_size(%rip), %rdx
 	syscall
+	pop_all
 	return
 
 copy:
 	enter
+	push_all
 	mov	$0, %rcx
 	cmp	%rcx, file_size(%rip)
 	je	copy_done
@@ -97,18 +108,22 @@ copy_loop:
 	cmp	%rcx, file_size(%rip)
 	jne	copy_loop
 copy_done:
+	pop_all
 	return
 
 read_line:
 	enter
+	push_all
+	mov	16(%rbp), %rax
 	sub	$128, %rsp
 	mov	$0, %rcx
 	cmp	%rcx, file_size(%rip)
 	je	read_line_done
 	mov	in(%rip), %rbx
+	add	%rax, %rbx
 read_line_loop:
 	mov	%rcx, %rdi
-	add	line(%rip), %rdi
+	add	linebuf(%rip), %rdi
 	mov	(%rbx, %rcx), %rsi
 	movb	%sil, (%rdi)
 	cmp	$0xa, %sil
@@ -118,35 +133,21 @@ read_line_loop:
 	jne	read_line_loop
 read_line_done:
 	mov	%rcx, %rax
-	return
-
-copy_lines:
-	enter
-	sub	$128, %rsp
-	mov	$0, %rcx
-	cmp	%rcx, file_size(%rip)
-	je	copy_lines_done
-	mov	in(%rip), %rbx
-copy_lines_loop:
-	mov	%rcx, %rdi
-	add	out(%rip), %rdi
-	mov	(%rbx, %rcx), %rsi
-	movb	%sil, (%rdi)
-	inc	%rcx
-	cmp	%rcx, file_size(%rip)
-	jne	copy_lines_loop
-copy_lines_done:
+	pop_all
 	return
 
 close:
 	enter
+	push_all
 	mov	$CLOSE, %rax
 	lea	fh, %rdi
 	syscall
+	pop_all
 	return
 
 munmap:
 	enter
+	push_all
 	mov	$MUNMAP, %rax
 	lea	in, %rdi
 	mov	file_size(%rip), %rsi
@@ -155,28 +156,65 @@ munmap:
 	lea	out, %rdi
 	mov	file_size(%rip), %rsi
 	syscall
+	pop_all
+	return
+
+print_lines:
+	enter
+	push_all
+	sub	$128, %rsp
+	mov	$0, %rbx
+
+print_lines_loop:
+
+	push	%rbx
+	call	print_int
+	pop	%rbx
+
+	push	%rbx
+	call	read_line
+
+	add	%rax, %rbx
+
+
+	push	linebuf(%rip)
+	push	%rax
+	call	write_string
+	pop	%rax
+	pop	%rax
+	pop	%rax
+
+	call	write_newline
+
+	inc	%rbx
+
+	cmp	$30, %rbx
+
+	jl	print_lines_loop
+print_lines_done:
+	push	$0x31
+	call	write_char_debug
+	pop_all
 	return
 
 main:
 	enter
+	push_all
 	call	open_file
 	call	stat_file
 	call	get_memory
 	mov	%rax, in(%rip)
 	call	get_memory
 	mov	%rax, out(%rip)
 	call	get_memory
-	mov	%rax, line(%rip)
+	mov	%rax, linebuf(%rip)
 	call	init_file
-	call	read_line
-	#call	copy
-
-	push	line(%rip)
-	push	%rax
-	call	write_string
-	call	write_newline
-	pop	%rax
-	pop	%rax
+	call	print_lines
+	#push	$0xc
+	#call	read_line
+	#push	linebuf(%rip)
+	#push	%rax
+	#call	write_string
 
 	call	close
 	call	munmap

print_int/main.s

@@ -1,15 +1,23 @@
 	.text
 	.globl main
 
-.include "../print_int/print_int.s"
+.include "print_int.s"
+
+basic_method:
+	enter
+	sub	$144, %rsp
+	push_all
+	mov	16(%rbp), %rsi
+	mov	$0, %rcx
+	pop_all
+	return
 
 main:
 	mov	$0x9084, %rax
 	shl	$16, %rax
 	add	$0xa412, %rax
 	push	%rax
 	call	print_int
-	jmp	exit
 
 exit:
 	movq	$EXIT, %rax