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How are strings stored in memory assembly?

2 Answers. A string is stored as consecutive characters in memory. If it’s ASCII (not UTF-8), each character is a single byte. So you can access them one at a time with byte loads/stores, like movzbl 2(%rsi), êx to get the 3rd character, if rsi points to the start of the string.

How are strings represented in assembly?

A string is represented as an array of char.

What is es assembly?

ES:DI (ES is Extra Segment, DI is Destination Index) is typically used to point to the destination for a string copy, as mentioned above.

Which character is used for termination of the string in assembly language?

Internally, the compiler does two things: Allocates memory for the string, and initializes the memory to ‘Y’, ‘o’, ‘!’ , and a special zero byte called a nul terminator that marks the end of the string.

What does SS mean in assembly?


Register Function
ss Stack section
es (extra section)
fs (supplemental section)
gs (supplemental section)

How to store the length of a string in Assembly?

Therefore, $-msg gives the length of the string. We can also write Alternatively, you can store strings with a trailing sentinel character to delimit a string instead of storing the string length explicitly. The sentinel character should be a special character that does not appear within a string.

Where do you store a string in C?

When strings are declared as character arrays, they are stored like other types of arrays in C. For example, if str [] is an auto variable then string is stored in stack segment, if it’s a global or static variable then stored in data segment, etc. 1) Read only string in a shared segment.

What kind of registers are used for 32 bit strings?

For 32-bit segments, string instructions use ESI and EDI registers to point to the source and destination operands, respectively. For 16-bit segments, however, the SI and the DI registers are used to point to the source and destination, respectively.

Where does the doubleword go in Assembly strings?

If the operand is of one byte, it is loaded into the AL register, if the operand is one word, it is loaded into the AX register and a doubleword is loaded into the EAX register. STOS − This instruction stores data from register (AL, AX, or EAX) to memory. CMPS − This instruction compares two data items in memory.