Beispiel-Programme 7.6.2022

20220607/calls-01.c

+#include <stdio.h>
+
+void setup (void)
+{
+  printf ("Hello, world!\n");
+}
+
+void loop (void)
+{
+  printf (":-) ");
+}
+
+int main (void)
+{
+  setup ();
+  while (1)
+    loop ();
+  return 0;
+}

20220607/calls-01.s

+	.file	"calls-01.c"
+	.text
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"Hello, world!"
+	.text
+	.globl	setup
+	.type	setup, @function
+setup:
+.LFB11:
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	leaq	.LC0(%rip), %rdi
+	call	puts@PLT
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	setup, .-setup
+	.section	.rodata.str1.1
+.LC1:
+	.string	":-) "
+	.text
+	.globl	loop
+	.type	loop, @function
+loop:
+.LFB12:
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	leaq	.LC1(%rip), %rdi
+	movl	$0, %eax
+	call	printf@PLT
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE12:
+	.size	loop, .-loop
+	.globl	main
+	.type	main, @function
+main:
+.LFB13:
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	call	setup
+.L6:
+	call	loop
+	jmp	.L6
+	.cfi_endproc
+.LFE13:
+	.size	main, .-main
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits

20220607/calls-02.c

+#include <stdio.h>
+
+void hello (void)
+{
+  for (int i = 0; i < 10; i++)
+    puts ("Hello, world!");
+}
+
+int main (void)
+{
+  hello ();
+  return 0;
+}

20220607/calls-02.s

+	.file	"calls-02.c"
+	.text
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"Hello, world!"
+	.text
+	.globl	hello
+	.type	hello, @function
+hello:
+.LFB11:
+	.cfi_startproc
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	pushq	%rbx
+	.cfi_def_cfa_offset 24
+	.cfi_offset 3, -24
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 32
+	movl	$10, %ebx
+	leaq	.LC0(%rip), %rbp
+.L2:
+	movq	%rbp, %rdi
+	call	puts@PLT
+	subl	$1, %ebx
+	jne	.L2
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 24
+	popq	%rbx
+	.cfi_def_cfa_offset 16
+	popq	%rbp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	hello, .-hello
+	.globl	main
+	.type	main, @function
+main:
+.LFB12:
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	call	hello
+	movl	$0, %eax
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE12:
+	.size	main, .-main
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits

20220607/calls-03.c

+#include <stdio.h>
+
+int main (void)
+{
+  char name[10];
+  printf ("Ihr Name: ");
+  gets (name);
+  printf ("Hallo, %s! :-)\n", name);
+  return 0;
+}

20220607/calls-04.c

+#include <stdio.h>
+
+int main (void)
+{
+  char name[10];
+  printf ("Ihr Name: ");
+  fgets (name, 9, stdin);
+  printf ("Hallo, %s! :-)\n", name);
+  return 0;
+}