[Solved]Cannot compile inw XX

leyley · Post by **leyley** » Tue Oct 30, 2012 10:31 pm

I cannot compile something like this:

outw %ax,$0x01F7

Code: Select all

Error: suffix or operands invalid for 'out'

X86 protected mode, paging enabled. I use gcc -m32 cause the host is a x86_64 red hat
Anyone can help me?
Thanks!
[Solved]Must use DX for port and AX for data.

Love4Boobies · Post by **Love4Boobies** » Tue Oct 30, 2012 10:56 pm

That immediate operand can only be 8-bit. Next time bother to at least check the manual.

leyley · Post by **leyley** » Tue Oct 30, 2012 11:04 pm

Love4Boobies wrote:That immediate operand can only be 8-bit. Next time bother to at least check the manual.

I don't have such GAS manual... Please give a link to download one. Thanks!

Kazinsal · Post by **Kazinsal** » Tue Oct 30, 2012 11:45 pm

He means the Intel processor manuals, which detail everything officially documented about the x86 processors.

If you're going to immediately ask for a link to those as well instead of googling for them (which I guarantee will return multiple proper results), maybe OS dev isn't the hobby for you.

leyley · Post by **leyley** » Wed Oct 31, 2012 12:15 am

Blacklight wrote:He means the Intel processor manuals, which detail everything officially documented about the x86 processors.

If you're going to immediately ask for a link to those as well instead of googling for them (which I guarantee will return multiple proper results), maybe OS dev isn't the hobby for you.

The 'link' I need is just a PDF version of GAS manual... If there are some places which can download one, please share it to me. Thanks.
I never ask something that told me the answer precisely. Just give me some directions. OK, I'll find Intel processor manuals.

Griwes · Post by **Griwes** » Wed Oct 31, 2012 12:47 am

No, you don't need GAS manual in PDF. You need intel or amd manuals, as it was stated above - they are the place describing valid instructions with valid operands, not GAS manual.

leyley · Post by **leyley** » Wed Oct 31, 2012 12:57 am

Griwes wrote:No, you don't need GAS manual in PDF. You need intel or amd manuals, as it was stated above - they are the place describing valid instructions with valid operands, not GAS manual.

Downloading... but very slow.
Thanks for your replies!

Kazinsal · Post by **Kazinsal** » Wed Oct 31, 2012 3:57 pm

Another good source, if you can wrap your head around it, is http://ref.x86asm.net/coder32.html -- a list of all x86 (not x86-64 though, you want coder.html for that) opcodes, and thus, what operands each instruction can take.

But the Intel/AMD manuals are the definitive source for documented instructions and operation of the x86 processors.

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[Solved]Cannot compile inw XX

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