From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Sat,  8 Jan 2005 11:46:39 -1000
From: Tim Newsham <newsham@lava.net>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] acid question
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References: <Pine.BSI.4.58.0501071729460.10670@malasada.lava.net>
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>     a		0x800529a4
>     b		0x800529a4
>     a == b	0
>
> Whats going on here?  Signed vs. unsigned issues?

Indeed a signed issue -- acid integer values are stored
as vlongs.  The value of a symbol such as "main" is being
converted to a vlong by zero-extension, while the symbol
value from strace() (Symbol.value) is a signed long which
is sign-extended.  One fix is to change
/sys/src/cmd/acid/list.c from

   l->ival = sym->value;

to

   l->ival = (ulong)sym->value;

Or perhaps the Symbol value field in <mach.h> should be a ulong?

Tim N.