Lab11

laborator/content/apel-functii/README.md

@@ -420,7 +420,7 @@ Implementați funcția `toupper` astfel încât translatarea să aibă loc doar
 
 ### Bonus: rot13
 
-Realizați și folosiți o funcție care face translatarea [rot13](http://www.decode.org/) a unui șir.
+Realizați și folosiți o funcție care face translatarea [rot13](https://rot13.com/) a unui șir.
 
 ### Bonus: rot13++
 

laborator/content/buffer-overflow/2-3-4-stack-buffer/stack_buffer.asm

@@ -32,6 +32,7 @@ main:
 
     ; Initialize local variable.
     mov dword [ebp-4], 0xCAFEBABE
+
 
     ; Fill data in buffer: buffer[i] = i+1
     ; Use ebx as buffer base address, ecx as index and dl as value.
@@ -46,7 +47,7 @@ fill_byte:
     inc ecx
     cmp ecx, 64
     jl fill_byte
-
+    mov dword [ebx+ecx], 0xDEADBEEF
     ; Print data in buffer.
     push buffer_intro_message
     call printf
@@ -67,7 +68,9 @@ print_byte:
 
     pop ecx	; restore ecx
     inc ecx
-    cmp ecx, 64
+    ;cmp ecx, 64
+    ;je change_variable
+    cmp ecx, 68
     jl print_byte
 
     ; Print new line. C equivalent instruction is puts("").
@@ -81,6 +84,12 @@ print_byte:
     push var_message_and_format
     call printf
     add esp, 8
+
+; change_variable:
+;     push eax
+;     xor eax,eax
+;     mov al, 
+;     mov byte [ebx+ecx],eax
 
     leave
     ret

laborator/content/buffer-overflow/5-6-read-stdin/payload

@@ -0,0 +1 @@
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAFLOW

laborator/content/interactiune-c-assembly/1-2-max-c-calls/main.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+unsigned int get_max(unsigned int *arr, unsigned int len, unsigned int *pos);
+
+int main(void)
+{
+	unsigned int arr[] = { 19, 7, 129, 87, 54, 218, 67, 12, 19, 99 };
+	unsigned int max, pos;
+
+	max = get_max(arr, 10, &pos);
+
+	printf("max: %u at position %u\n", max, pos);
+
+	return 0;
+}

laborator/content/interactiune-c-assembly/4-5-max-c-calls/max.asm → laborator/content/interactiune-c-assembly/1-2-max-c-calls/max.asm

@@ -8,22 +8,28 @@ get_max:
 
 	; save ebx in callee
 	push ebx
-
+	push edx
 	; [ebp+8] is array pointer
 	; [ebp+12] is array length
-
+	; [ebp+16] maximum position
 	mov ebx, [ebp+8]
 	mov ecx, [ebp+12]
+	mov edx, [ebp+16]
 	xor eax, eax
 
 compare:
 	cmp eax, [ebx+ecx*4-4]
 	jge check_end
 	mov eax, [ebx+ecx*4-4]
+	mov [edx], ecx
+
 check_end:
 	loopnz compare
-
+	mov ecx, [edx]
+	dec ecx
+	mov [edx], ecx
+	pop edx
 	pop ebx
 
 	leave
-	ret
+	ret

laborator/content/interactiune-c-assembly/1-inline-for/Makefile → laborator/content/interactiune-c-assembly/3-stack-frame/Makefile

@@ -1,3 +1,3 @@
-PROGNAME := inline_for
+PROGNAME := stack-frame
 include ../../utils/Makefile.generic
 

laborator/content/interactiune-c-assembly/3-stack-frame/main.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+void print_hello(void);
+
+void asm_call_wrapper(void)
+{
+	print_hello();
+	printf(" world");
+}
+
+
+int main(void)
+{
+	asm_call_wrapper();
+	printf("!\n");
+
+	return 0;
+}

laborator/content/interactiune-c-assembly/3-stack-frame/print-hello.asm

@@ -0,0 +1,19 @@
+extern printf
+
+section .data
+	message db "Hello", 0
+
+section .text
+
+global print_hello
+
+;   TODO: Adăugați instrucțiunea lipsă
+print_hello:
+	push ebp
+	mov ebp, esp
+	push message
+	call printf
+	add esp, 4
+
+	leave
+	ret

laborator/content/interactiune-c-assembly/6-7-max-assembly-calls/main.asm → laborator/content/interactiune-c-assembly/4-5-max-assembly-calls/main.asm

@@ -4,9 +4,8 @@ extern get_max
 section .data
     arr: dd 19, 7, 129, 87, 54, 218, 67, 12, 19, 99
     len: equ $-arr
-
-    print_format: db "max: %u", 13, 10, 0
-
+    pos: dd 0
+    print_format: db "max: %u at position:%u", 13, 10, 0
 section .text
 
 global main
@@ -20,17 +19,18 @@ main:
     ; using shr 2 (shift right with 2 bits).
     mov eax, len
     shr eax, 2
-
+    push pos
     push eax
     push arr
     call get_max
-    add esp, 8
+    add esp, 12
 
     ; Print max.
+    push dword[pos]
     push eax
     push print_format
     call printf
     add esp, 8
 
     leave
-    ret
+    re

laborator/content/interactiune-c-assembly/4-5-max-assembly-calls/max.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+unsigned int get_max(unsigned int *arr, unsigned int len, unsigned int *pos)
+{
+	unsigned int max = 0;
+	size_t i;
+
+	for (i = 0; i < len; i++)
+		if (max < arr[i]) {
+			max = arr[i];
+			*pos = i;
+		}
+
+	return max;
+}

laborator/content/interactiune-c-assembly/2-inline-rotate/Makefile → laborator/content/interactiune-c-assembly/6-7-regs-preserve/Makefile

@@ -1,3 +1,3 @@
-PROGNAME := inline_rotate
+PROGNAME := regs-preserve
 include ../../utils/Makefile.generic
 

laborator/content/interactiune-c-assembly/6-7-regs-preserve/double_array.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+void double_array(unsigned int *array, unsigned int len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++)
+		*(array + i) *= 2;
+}