print_int: fix rsi clobbering

Author: h908714124

README.md

@@ -8,7 +8,7 @@
 
 [What is stack frame](https://stackoverflow.com/questions/3699283/what-is-stack-frame-in-assembly)
 
-[C headers in Asm](http://thomasloven.com/blog/2012/06/C-Headers-In-Asm/)
+[Linux clobbered registers](https://stackoverflow.com/questions/69515893/when-does-linux-x86-64-syscall-clobber-r8-r9-and-r10)
 
 ```
 /usr/include/asm-generic/fcntl.h

print_int/.gdbinit

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

print_int/Makefile

@@ -6,7 +6,7 @@ run: build
 	./print_int
 
 check: build
-	./print_int | md5sum | grep -q ^0d0f199 && printf "\033[1;32m[OK]\033[0m\n"
+	./print_int | md5sum | grep -q ^3cca2fa && printf "\033[1;32m[OK]\033[0m\n"
 
 clean:
 	rm -f print_int

print_int/main.s

@@ -16,10 +16,7 @@ main:
 	mov	$6, %r11
 	mov	$7, %rdi
 	mov	$8, %rdx
-	mov	$255, %rsi
-
-	push	%rsi
-	log	%rsi
+	mov	$9, %rsi
 
 	log	%rax
 	log	%rbx
@@ -43,9 +40,6 @@ main:
 	log	%rdx
 	log	%rsi
 
-	pop	%rsi
-	log	%rsi
-
 exit:
 	movq	$EXIT, %rax
 	movq	$0, %rdi

print_int/print_int.s

@@ -104,10 +104,9 @@ write_string:
 print_int:
 	enter
 
-	mov	16(%rbp), %rsi			# param: number to print
-
 	sub	$48, %rsp
 	push_all
+	mov	16(%rbp), %rsi			# param: number to print
 	push	%rax
 
 	mov	$0, %rcx