You have a 64-bit number 0xCCCCCCCCAAAAAAAA. Write an assembly program to implement 64-bit Logic Shift Right. Shift this 64-bit number right by 4 [closed] solved You have a 64-bit number 0xCCCCCCCCAAAAAAAA. Write an assembly program to implement 64-bit Logic Shift Right. Shift this 64-bit number right by 4 [closed]
Not doing something to the outcome of both sub‘s relies on the byte wraparound and can only works as long as unsigned logic is used via jbe and friends. This is the simplest code you can write to differentiate between any case letters and all the rest: sub al, ‘A’ cmp al, ‘Z’-‘A’ jbe Letter … Read more
Nothing trivial and time consuming. You need to study e.MMC standard from JEDEC to understand how host and card side works. You can get the documents free from their site for a registration. You then also need to understand how the connection is made to that eMMC host interface. That would be probably lead you … Read more
1) x86 probably the worst instruction set to learn first. just because you have one is not a good reason (you may not know it but for every x86 you have several arm processors not that using those is a good idea either). 2) start with a simulator, bare metal makes it a lot easier…pcemu … Read more
how to input floating point numbers in assembly language… and how to add subtract and multiply these floating point numbers [closed] solved how to input floating point numbers in assembly language… and how to add subtract and multiply these floating point numbers [closed]
Answer: In order to do the opposite of your encryption operation, you should replace the call to encrypt_nn with a new routine that decrements instead of increments: __asm { decrypt_nn: mov eax, ecx dec eax ret } Comment: You have changed the loop statement from for (int i = 0; i < length; i++) to … Read more
Even I get an warning a function returns an address from local variable, it compiles. Isn’t it then UB of compiler? No, but if it were, how could you tell? You seem to have a misunderstanding of undefined behavior. It does not mean “the compiler must reject it”, “the compiler must warn about it”, “the … Read more
mov -0x4(%esi,%ebx,4),%eax sets the value of eax to what’s at [esi + ebx*4 – 4] cmp %eax,(%esi,%ebx,4) compares eax to what’s at [esi + ebx*4] solved Can someone help me understand those assembly lines? [closed]
Those two lines are checking for a “negative” sign on either of the 16 bit zoned or unpacked decimal numbers, which contain one decimal digit per byte (bcd – binary coded decimal) in the low order bits (bits 0 to 3). The sign is stored in bits 4 through 7 of the least significant byte. … Read more
This code prints a prompt and inputs a number. It then prints that number of lines of stars. On the first line is 1 star, the second line 2 stars, and so on. I have annotated the code to make it more clear. The code does this with two nested loops. The ecx register is … Read more
You can write it in gcc as: #include <stdio.h> int main () { int a = 0 ; /*How can I write it on gcc*/ __asm__ __volatile__ ( “movl $2, %0\n\t” “addl $4, %0\n\t” :”=r”(a) /* =r(egister), =m(emory) both fine here */ ); printf (“%d\n”,a ); return 0 ; } 1 solved Following is some … Read more
Mul EBX multiplies the value in EAX with EBX. The lower 32 bits of the result are stored in EAX, the higher 32 bits of the result are stored in EDX. EAX will be 264 and EDX will be 0. Mul (+ 32bit register) multiplies EAX with the specified register, stores the the lower 32 … Read more
A pure 8086 assembly solution is this: mov bx, 1234h ; bx = 1234h === input mov dx, bx ; dx = 1234h shr bx, 8 ; bx = 0012h shl dx, 8 ; dx = 3400h mov ax, bx ; ax = 0012h mov cx, dx ; cx = 3400h shr bx, 4 ; … Read more
For any operation that accepts an immediate, you can set the other operand to be the identity element of that operation: x = op(x, I). Here are some options: Add or subtract 0 Perform bitwise OR with 0 Perform bitwise AND with all 1s (-1 in 2’s complement) Multiply with or divide by 1 12 … Read more
** yes you can but this is very diffecult for any one and if you do this what make programmers and all design programming lanaguages to make things easily comparing by machine code and this is project as you ask it’s an OS written in machine code it’s still under developing http://www.magicschoolbook.com/computing/os-project note : your … Read more