Mail Archives: djgpp/1999/02/03/21:20:47
From: | Andrew Kesterson <Andrew__k_ AT geocities DOT com>
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | Inline asm problem
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Date: | Wed, 03 Feb 1999 20:15:16 -0600
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Organization: | Computer Programmer, Freelance
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Lines: | 22
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Message-ID: | <36B902B4.7F00@geocities.com>
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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Reply-To: | djgpp AT delorie DOT com
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In my code, I have the following inline ASM:
__asm__("pushl %%eax\n
movl %%eip, %0\n
popl %%eax"
:
: "a" ((*StackPtr))
: );
where StackPtr is an unsigned long which points to the stack of a
program (this is part of the kernel code for an OS I am writing as an
experiment).
I cannot seem to figure out why it will not pass StackPtr. It will not
pass anything else, either. I'm positive I had StackPtr in the right
spot, as the 2nd : is the place for output operands. I am pretty sure %0
is correct, but just to be sure I changed it to %1 and even %2. still
nothing.
Every time I compile this code, no matter how I have it arranged, it
gives me a parse error. I've checked the DJGPP faq's, the documentation,
EVERYTHING that I could find (including repeated trips to the info
page), but nothing is seeming to work. What in the bloody **** am I
doing wrong?
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