ajout 23 mai

Pierre Cwik
1 parent 42a7f240
Showing 14 changed files with 164 additions and 0 deletions Show diff stats
liens/constante
liens/constante.c
liens/constante.o
liens/globale
liens/globale.c
liens/globale.o
liens/liens.txt
liens/minimal
liens/minimal.c
liens/minimal.o
liens/simple.c
liens/statique
liens/statique.c
liens/statique.o
@@ -0,0 +1,13 @@
+
+void _start(void)
+{
+
+char *chaine = "salut";
+int i=0;
+
+while(chaine[i] != '\0') { i++; }
+  
+__asm__ volatile("syscall" :: "a" (60), "D" (i) );
+
+
+}
 \ No newline at end of file
@@ -0,0 +1,9 @@
+int j=42;
+
+void _start(void)
+{
+  
+__asm__ volatile("syscall" :: "a" (60), "D" (j) );
+
+
+}
 \ No newline at end of file
@@ -0,0 +1,119 @@
+
+
+//////////////////////////////////       exercice : piste noire           ///////////////////////////////////
+
+en assembleur cela fonctionne __asm__ volatile("syscall" :: "a" (60), "D" (42) );
+
+Avec readelf on voit qu'on utilise pas de bibliotheque et il n'utilise que 6 sections
+
+pcwik@gambrinus14:~/Desktop/pierrotc/liens$ ldd minimal
+        not a dynamic executable
+
+
+
+////////////////////////////////////      exercice "épilogue"                  //////////////////////////////
+
+
+l'executable n'a plus que 2 sections
+
+Section Headers:
+  [Nr] Name              Type             Address           Offset
+       Size              EntSize          Flags  Link  Info  Align
+  [ 0]                   NULL             0000000000000000  00000000
+       0000000000000000  0000000000000000           0     0     0
+  [ 1] .text             PROGBITS         00000000004000b0  000000b0
+       0000000000000014  0000000000000000  AX       0     0     1
+  [ 2] .shstrtab         STRTAB           0000000000000000  000000c4
+       0000000000000011  0000000000000000           0     0     1
+
+
+
+EDITION DES LIENS 2/5
+
+///////////////////////////////////   Exercice  "segment pour constante"     /////////////////////////////////////::
+
+
+void _start(void)
+{
+
+char *chaine = "salut";
+int i=0;
+
+while(chaine[i] != '\0') { i++; }
+  
+__asm__ volatile("syscall" :: "a" (60), "D" (i) );
+
+
+}
+
+AVEC LE  PROGRAMME CI DESSUS j'OBTIENT LES SECTIONS CI DESSOUS :
+
+Section Headers:
+  [Nr] Name              Type             Address           Offset
+       Size              EntSize          Flags  Link  Info  Align
+  [ 0]                   NULL             0000000000000000  00000000
+       0000000000000000  0000000000000000           0     0     0
+  [ 1] .text             PROGBITS         00000000004000b0  000000b0
+       000000000000003b  0000000000000000  AX       0     0     1
+  [ 2] .rodata           PROGBITS         00000000004000eb  000000eb
+       0000000000000006  0000000000000000   A       0     0     1
+  [ 3] .shstrtab         STRTAB           0000000000000000  000000f1
+       0000000000000019  0000000000000000           0     0     1
+
+       
+//////////////////////////////////////////////////Exercice "segment pour variable globale initialisée" ////////////////////////////////
+
+
+int j = 42;
+
+void _start(void)
+{
+  
+__asm__ volatile("syscall" :: "a" (60), "D" (j) );
+
+
+}
+
+Section Headers:
+  [Nr] Name              Type             Address           Offset
+       Size              EntSize          Flags  Link  Info  Align
+  [ 0]                   NULL             0000000000000000  00000000
+       0000000000000000  0000000000000000           0     0     0
+  [ 1] .text             PROGBITS         00000000004000b0  000000b0
+       0000000000000014  0000000000000000  AX       0     0     1
+  [ 2] .shstrtab         STRTAB           0000000000000000  000000c4
+       0000000000000011  0000000000000000           0     0     1
+
+
+///////////////////////////////////////////////////:: STATIQUE ///////////////////////////////////////////////////::
+
+void _start(void)
+
+{
+  
+static int i;
+
+__asm__ volatile("syscall" :: "a" (60), "D" (i) );
+
+
+}
+
+
+
+Section Headers:
+  [Nr] Name              Type             Address           Offset
+       Size              EntSize          Flags  Link  Info  Align
+  [ 0]                   NULL             0000000000000000  00000000                                                                          
+       0000000000000000  0000000000000000           0     0     0                                                                             
+  [ 1] .text             PROGBITS         00000000004000e8  000000e8                                                                          
+       0000000000000015  0000000000000000  AX       0     0     1                                                                             
+  [ 2] .bss              NOBITS           0000000000600100  00000100
+       0000000000000008  0000000000000000  WA       0     0     4
+  [ 3] .shstrtab         STRTAB           0000000000000000  000000fd
+       0000000000000016  0000000000000000           0     0     1
+
+
+       
+       
+
+
@@ -0,0 +1,5 @@
+void _start(void)
+{
+__asm__ volatile("syscall" :: "a" (60), "D" (42) );
+}
+
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(void)
+{
+printf("j'ai MENTI\n");
+return 0;
+}
@@ -0,0 +1,11 @@
+
+void _start(void)
+
+{
+  
+static int i;
+
+__asm__ volatile("syscall" :: "a" (60), "D" (i) );
+
+
+}
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