Add TP3

TP/TP3/Makefile

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+88PATH  =  ../../TD/TD10/88/bin
+
+asm: main.asm
+	nasm -f elf32 -o main.o main.asm
+	ld -m elf_i386 -o main main.o
+	rm -f main.o
+
+exec-88: main.s
+	$(88PATH)/as88 main.s || echo error
+	$(88PATH)/s88 main.s
+
+clean:
+	rm -f main main.# main.$$ main.88 main.o

TP/TP3/README.md

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+# Test de primalité en assembleur (x86 et 8088)
+
+Les entrées sont dans les fichiers de code, à modifier avant la compilation (avec la valeur par défaut 37).
+
+## Compilation
+
+Pour compiler pour 8088, et exécuter directement (sans l'interpréteur interactif):
+
+```bash
+make exec-88
+```
+
+Pour compiler pour x86:
+```bash
+make asm
+```
+
+Cela demande `nasm` d'installé et fournit un exécutable `main`
+
+Pour nettoyer le projet:
+```bash
+make clean
+```

TP/TP3/main.asm

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+; This programs checks if a number n>1 is prime
+; it checks for divisors from 2 to n-1, but does not terminate if n=1
+section .data
+    is_prime db "prime"
+    is_len equ $ - is_prime
+    not_prime db "not prime"
+    not_len equ $ - not_prime
+
+
+section .text
+global _start
+_start:
+    mov ebx, 37 ; hardcoded number to check
+    call check_prime
+
+; n is loaded from ebx
+check_prime:
+    mov ecx, 2 ; number to start at for primality check
+    loop:
+        cmp ecx, ebx
+        je end_is_prime ; if at the end of the loop, call end_is_prime
+
+        ; operate division (bdx/ecx) <=> (num/current)
+        xor edx, edx ; will store remainder
+        mov eax, ebx
+        div ecx
+
+        cmp edx, 0 ; check if ecx divides ebx
+        je end_is_not_prime
+        inc ecx    ; continue loop
+        jmp loop
+
+
+; success
+end_is_prime:
+    mov edx, is_len
+    mov ecx, is_prime
+    mov ebx, 1       ; stdout
+    mov eax, 4       ; sys_write
+    int 0x80
+
+    mov eax, 1        ; sys_exit
+    mov ebx, 0        ; exit code 0
+    int 0x80          ; syscall
+
+; failure
+end_is_not_prime:
+    mov edx, not_len
+    mov ecx, not_prime
+    mov ebx, 1       ; stdout
+    mov eax, 4       ; sys_write
+    int 0x80         ; syscall
+
+    mov ebx, 1        ; exit code 1
+    mov eax, 1        ; sys_exit
+    int 0x80          ; syscall

TP/TP3/main.s

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+! This programs checks if a number n>1 is prime
+! it checks for divisors from 2 to n-1, but does not terminate if n=1
+
+_EXIT	= 1
+_WRITE	= 4
+_STDOUT	= 1
+.SECT .TEXT
+start:
+	MOV  BX,37 ! hardcoded number to check
+	CALL check_prime
+
+    PUSH 2
+    PUSH _EXIT
+    SYS
+
+! n is loaded from BX
+check_prime:
+    MOV CX,2 ! number to start at for primality check
+l:  CMP CX,BX
+    JE end_is_prime ! if CX=BX, exit, n is prime
+
+    ! operate division (DX/CX) <=> (num/current)
+    XOR DX,DX ! will store remainder
+    MOV AX,BX
+    DIV CX
+
+    CMP DX,0 ! check if CX divides BX
+    JE end_is_not_prime
+    INC CX ! continue loop
+    JMP l
+
+end_is_prime:
+    PUSH 6
+    PUSH is_prime
+    PUSH _STDOUT
+    PUSH _WRITE
+    SYS
+
+    SUB SP,8
+
+    PUSH 0
+    PUSH _EXIT
+    SYS
+
+end_is_not_prime:
+    PUSH 10
+    PUSH not_prime
+    PUSH _STDOUT
+    PUSH _WRITE
+    SYS
+
+    SUB SP,8
+
+    PUSH 1
+    PUSH _EXIT
+    SYS
+
+
+
+.SECT .DATA
+is_prime:
+.ASCII	"prime\n"
+not_prime:
+.ASCII	"not prime\n"
+
+.SECT .BSS