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Apr 22, 2017
Almost all programming languages have the ability to change the order in which statements are evaluated, and assembly is no exception. . Loads EIP with the specified address, if minuend of previous cmp instruction is lesser than or equal to the subtrahend . jbe is the same as jle , except that it performs an unsigned
JBE Jump If Below or Equal Flags: not altered JBE short-label Jump Condition: Jump if CF = 1 or ZF = 1 Used after a CMP or SUB instruction, JBE transfers control to short- label if the first operand was less than or equal to the second. (Both operands are treated as unsigned numbers.) The target of the jump must be within
May 18, 2017 When you do a cmp a,b , the flags are set as if you had calculated a - b . Then the jmp -type instructions check those flags to see if the jump should be made. In other words, the first block of code you have (with my comments added): cmp al,dl ; set flags based on the comparison jg label1 ; then jump based on the flags.
Assembly Conditions - Learning assembly programming language in simple and easy steps using this beginner's tutorial containing basic to advanced Conditional execution in assembly language is accomplished by several looping and branching instructions. JBE/JNA, Jump Below/Equal or Jump Not Above, AF, CF
The target instruction is specified with a relative offset (a signed offset relative to the current value of the instruction pointer in the EIP register). A relative offset (rel8, rel16, or rel32) is generally specified as a label in assembly code, but at the machine code level, it is encoded as a signed, 8-bit or 32-bit immediate value,
Mnemonic, Meaning, Jump Condition. JA, Jump if Above, CF="0" and ZF="0". JAE, Jump if Above or Equal, CF="0". JB, Jump if Below, CF="1". JBE, Jump if Below or Equal, CF="1" or ZF="1". JC, Jump if Carry, CF="1". JCXZ, Jump if CX Zero, CX="0". JE, Jump if Equal, ZF="1". JG, Jump if Greater (signed), ZF="0" and SF="OF". JGE, Jump if
Looking more closely I found that many of the instructions were synonyms for each other, and in practice the whole gamut is not needed, and in the process found that JBE JNA, Jump if below or equal. Jump if not above, unsigned, CF = 1 or ZF = 1, 76, 0F 86. JA JNBE, Jump if above. Jump if not below or equal, unsigned
First, looking in array above, we see that several jumps have same flag conditions and would get same opcode. JB ? JC ? JNAE; JAE ? JNB ? JNC; JE ? JZ; JNE ? JNZ; JBE ? JNA; JA ? JNBE; JP ? JPE; JNP ? JPO; JL ? JNGE; JGE ? JNL; JLE ? JNG; JG ? JNLE. That's why a JE instruction is equivalent to a JZ.
Nov 11, 2015 X86-assembly/Instructions/jbe. From aldeid. Jump to: navigation, search. You are here: X86-assembly · Instructions. jbe. Description. Same as jle but an unsigned comparison is performed. Syntax. jbe destination, source. Comments. We were unable to load Disqus. If you are a moderator please see our
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