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rep stos dword ptr es edi
stosw
intel stos instruction
rep stos instruction
stosq
stosb assembly example
x86 rep
rep stos dword ptr es:[edi]
The following example demonstrates use of the LODS and STOS instruction to convert an upper case string to its lower case value ? section .text global _start ;must be declared for using gcc _start: ;tell linker entry point mov ecx, len mov esi, s1 mov edi, s2 loop_here: lodsb or al, 20h stosb loop loop_here cld rep movsb mov
For example, one variant of the MOVS (move string) instruction copies a string from the source address specified by ESI to the destination address specified by EDI, repe.scasw(); repe.scasd(); repne.scasb(); // Note: repnz is a synonym for repne. repne.scasw(); repne.scasd(); For STOS: rep.stosb(); rep.stosw(); rep.stosd();.
x86 Instructions. This is the only instruction that allows the source and destination to be The rep stos instruction is used to fill a block of memory with accT. REP. Repeat while ECX not zero. One thing worth mentioning about the last instruction XOR RAX, RAX is that it's "/x29/xcc" /* sub esp, ecx */ "/x89/xe7" /* mov edi, esp
28 Nov 2015 MOV AL,0 ;The value to initialize BUFFER to LEA DI,BUFFER ;Starting location of BUFFER MOV CX,100 ;Size of BUFFER CLD ;Let's move in forward direction REP STOS BUFFER ;Compare this line to example for STOSB. (Source: www.cs.ubbcluj.ro/~forest/HtmlFolder/AC/NG/ng1cf0a.html)
17 Oct 2016 Edit on segment registers: The lods instruction can be used together with segment override prefix (i.e. ss lodsb ). The stos instruction is fixed to es (missing detail in original answer) segment usage, and can't be overridden. The movsb/movsw/movsd instructions ( size*(mov [es:edi],[ds:esi] inc esi inc edi)
main: 0000000140001000 push rdi. 0000000140001002 sub rsp,20h. 0000000140001006 xor eax,eax. 0000000140001008 mov word ptr [rsp+8],ax. 000000014000100D lea rax,[rsp+0Ah]. 0000000140001012 mov rdi,rax. 0000000140001015 xor eax,eax. 0000000140001017 mov ecx,0Ah. 000000014000101C rep stos
29 Sep 2010 For ecx repetitions, stores the contents of eax into where edi points to, incrementing or decrementing edi (depending on the direction flag) by 4 bytes each time. Normally, this is used for a memset -type operation. Usually, that instruction is simply written rep stosd . Experienced assembly coders know all the
At the assembly-code level, two forms of the instruction are allowed: the “explicit-operands" form and the “no-operands" form. The explicit-operands form The STOS, STOSB, STOSW, STOSD, STOSQ instructions can be preceded by the REP prefix for block loads of ECX bytes, words, or doublewords. More often, however
F3 A4, REP MOVS m8, m8, Move (E)CX bytes from DS:[(E)SI] to ES:[(E)DI]. F3 AB, REP STOS m32, Fill (E)CX doublewords at ES:[(E)DI] with EAX. The REP prefix can be added to the INS, OUTS, MOVS, LODS, and STOS instructions, and the REPE, REPNE, REPZ, and REPNZ prefixes can be added to the CMPS and
At the assembly-code level, two forms of this instruction are allowed: the "explicit-operands" form and the "no-operands" form. The explicit-operands form The STOS, STOSB, STOSW, and STOSD instructions can be preceded by the REP prefix for block loads of ECX bytes, words, or doublewords. More often, however
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