-=> Nightfox wrote to Boraxman <=-
Ni> @MSGID: <61C6BCF6.3338.dove_dove-prg@digitaldistortionbbs.com>
Ni> @REPLY: <61C649CF.2751.dove-prg@bbs.mozysswamp.org>
Ni> Re: C is the most efficient p
Ni> By: Boraxman to Nightfox on
Ni> Sat Dec 25 2021 09:12 am
Ni>> But still, assembler for each processor is defined by the operations
Ni>> that the processor understands, and there is a specific syntax for
Ni>> each operation.
Bo> Have you ever used AT&T syntax?
Ni> I haven't.
It's an alternative syntax for assembler, used by GAS and I guess other
assemblers for Unix too.
An example from a program I wrote is below
movl %eax, BRK_Start
movl %eax, BRK_End
movl (%esp), %ecx
cmp $1, %ecx
je clifail
cmp $3, %ecx
jg clifail
movl 8(%esp), %ebx
jl success
movb (%ebx), %al
As you can see, the syntax is familiar, but different. Source and destination
are the other way around for MOV commands, the offset notation is different,
immediate values are prefixed with a $.
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