Vortragsfolien, Notizen und Beispiele 17.5.2023

20230517/functions-01-O3.s

+	.file	"functions-01.c"
+	.text
+	.p2align 4,,15
+	.globl	sum
+	.type	sum, @function
+sum:
+.LFB11:
+	.cfi_startproc
+	leal	(%rdi,%rsi), %eax
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	sum, .-sum
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"c = %d\n"
+	.section	.text.startup,"ax",@progbits
+	.p2align 4,,15
+	.globl	main
+	.type	main, @function
+main:                                               ; #include <stdio.h>
+.LFB12:                                             ; 
+	.cfi_startproc                              ; int sum (int a, int b)
+	subq	$8, %rsp                            ; {
+	.cfi_def_cfa_offset 16                      ;   return a + b;
+	movl	$10, %esi                           ; }
+	leaq	.LC0(%rip), %rdi                    ; 
+	xorl	%eax, %eax                          ; int main (void)
+	call	printf@PLT                          ; {
+	xorl	%eax, %eax                          ;   int c = sum (3, 7);
+	addq	$8, %rsp                            ;   printf ("c = %d\n", c);
+	.cfi_def_cfa_offset 8                       ;   return 0;
+	ret                                         ; }
+	.cfi_endproc
+.LFE12:
+	.size	main, .-main
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits

20230517/functions-01.c

+#include <stdio.h>
+
+int sum (int a, int b)
+{
+  return a + b;
+}
+
+int main (void)
+{
+  int c = sum (3, 7);
+  printf ("c = %d\n", c);
+  return 0;
+}

20230517/functions-01.s

+	.file	"functions-01.c"
+	.text
+	.globl	sum
+	.type	sum, @function
+sum:
+.LFB0:
+	.cfi_startproc
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register 6
+	movl	%edi, -4(%rbp)
+	movl	%esi, -8(%rbp)
+	movl	-4(%rbp), %edx
+	movl	-8(%rbp), %eax
+	addl	%edx, %eax
+	popq	%rbp
+	.cfi_def_cfa 7, 8                               ; #include <stdio.h>
+	ret                                             ; 
+	.cfi_endproc                                    ; int sum (int a, int b)
+.LFE0:                                                  ; {
+	.size	sum, .-sum                              ;   return a + b;
+	.section	.rodata                         ; }
+.LC0:                                                   ; 
+	.string	"c = %d\n"                              ; int main (void)
+	.text                                           ; {
+	.globl	main                                    ;   int c = sum (3, 7);
+	.type	main, @function                         ;   printf ("c = %d\n", c);
+main:                                                   ;   return 0;
+.LFB1:                                                  ; }
+	.cfi_startproc
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register 6
+	subq	$16, %rsp
+	movl	$7, %esi
+	movl	$3, %edi
+	call	sum
+	movl	%eax, -4(%rbp)
+	movl	-4(%rbp), %eax
+	movl	%eax, %esi
+	leaq	.LC0(%rip), %rdi
+	movl	$0, %eax
+	call	printf@PLT
+	movl	$0, %eax
+	leave
+	.cfi_def_cfa 7, 8
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	main, .-main
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits

20230517/logo-hochschule-bochum-cvh-text-v2.pdf

+../common/logo-hochschule-bochum-cvh-text-v2.pdf
\ No newline at end of file

20230517/logo-hochschule-bochum.pdf

+../common/logo-hochschule-bochum.pdf
\ No newline at end of file

20230517/pgslides.sty

+../common/pgslides.sty
\ No newline at end of file

20230517/rtech-20230517.txt

+Binär codiertes Dezimalsystem (BCD), 17.05.2023, 11:27:10
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Speicherzellen (hexadezimal): 0123
+--> dezimal: 1 · 256 + 2 · 16 + 3 = 291
+
+komfortabler zum Lesen: Interpretation als Dezimalzahl 123
+--> Jede Hex-Ziffer wird als Dezimalziffer interpretiert.
+--> bequem zu lesen (im Debugger)
+    bequem für die Ausgabe (z.B. beim Drucken)