Date: Sat, 27 Oct 2001 19:08:58 -0400 From: "Matthew Emmerton" <matt@gsicomp.on.ca> To: <hackers@freebsd.org> Subject: Simple x86 assembler question Message-ID: <003901c15f3c$5bdef760$1200a8c0@gsicomp.on.ca>
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Hi all, This weekend I decided to do some assembly hacking on some object-only code that I've lost the C source for. Since I haven't coded assembler for at least 8 years, and I threw my x86 assembly manuals out when I moved 6 months ago, there are a few things that are stumping me. In particular, am I interpreting these instructions correctly? 0x80839fb <uttstrbyt+43>: movzbl (%edx,%eax,1),%eax Takes %eax + %edx, obtains the byte value in memory at that address, zero-extends and places into %eax 0x80839ff <uttstrbyt+47>: movzwl 0xe90(%ebx,%eax,2),%edx Takes %eax + %ebx + 0xe90, obtains the word value in memory at that address, zero-extends and places in %edx. -- Matt Emmerton To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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