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Re: Calling convention that gets frame pointer register clobbered

From: Jim Wilson <wilson at specifixinc dot com>
To: Etienne Lorrain <etienne_lorrain at yahoo dot fr>
Cc: gcc at gcc dot gnu dot org
Date: Fri, 19 Dec 2003 12:24:14 -0800
Subject: Re: Calling convention that gets frame pointer register clobbered
References: <20031219114307.78240.qmail@web11805.mail.yahoo.com>

Etienne Lorrain wrote:

 Another related question: Is it possible, by inline assembler, to get GCC
 to save segment registers?

Gcc doesn't know about the segment registers. Support for them would have to be added in: new registers, register classes, constraint letters, instructions for saving and restoring them. That won't happen unless someone volunteers a patch.

 You cannot compile the logical (%si containning the address of a
 structure to be filled by the disk BIOS service int $0x13):

I don't understand what the complaint is here. The example you gave doesn't compile because ebiosinfo_t is undefined. If I add a simple structure, then it does compiler. I don't get an error with gcc-3.3 or current mainline. I don't see anything obviously wrong with the resulting assembly code. -- Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

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References:
- Re: Calling convention that gets frame pointer register clobbered
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