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What’s the difference between EAX, EBX, and ECX in assembly? 35 eax, ebx, ecx and so on are actually registers, which can be seen as "hardware" variables, somewhat similar to higher level-language's variables Registers can be used in your software directly with instructions such as mov, add or cmp The leading e stands for e xtended and means that your register is 32 bits wide
Linux NASM: What is the value in ebx when you invoke sys_exit? %ebx is the status code for the exit system call This means that whatever is stored in %ebx will be returned to the Operating System Therefore, after executing your application on a terminal, issuing this command: echo $? will print the return code of your app Pages 20,21,22 of Programming from the Ground Up explains this very well
Are the data registers EAX, EBX, ECX and EDX interchangeable For example, for the write system call, it grabs the file descriptor from ebx, a pointer to the buffer you want to write from ecx and the number of bytes you want to write from edx The kernel does not know what your intentions are, it just stupidly grabs whatever is in the registers, so it does matters which registers you use
Error moving a constant byte value into %ebx - Stack Overflow My understanding is that this line intends to copy 0xF to a location in main memory, however %ebx is a 32-bit register, memory addresses are 64 bits wide on 64-bit machines, and so %ebx cannot hold a memory address, therefore it cannot be dereferenced (dereferencing is what the parentheses around %ebx represent, correct?)
Inline assembly error: unknown register name ‘%%ebx’ in ‘asm’ Save this answer Show activity on this post Drop one % from the clobbered line : "%%ebx" * clobbered register * ^ You must leave it in in all other lines EDIT Remove extern int errno; and include errno h
assembly - Why cannot do mov [eax], [ebx] - Stack Overflow You can't do mov [eax], [ebx] because that implies a machine instruction that will let you specify two memory operands The x86 instruction set is largely designed around machine instructions that let you specify one register and one memory operand, because that is pretty useful, and it doesn't affect performance of operations that fetch to
Tibco EBX ~ Filter after Technical details - Stack Overflow I need help with filtering in Tibco EBX rest API I am trying to filter after quot;technicalDetails quot; information like lastUpdateDate or lastUpdateUser As of the current Tibco EBX documentati
x86 Assembly pointers - Stack Overflow I am trying to wrap my mind around pointers in Assembly What exactly is the difference between: mov eax, ebx and mov [eax], ebx and when should dword ptr [eax] should be used? Also when I try to