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Mail Archives: cygwin-apps/2002/04/28/08:18:25

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From: "Ralf Habacker" <Ralf DOT Habacker AT freenet DOT de>
To: <kde-cygwin AT mail DOT kde DOT org>, "Ralf Habacker" <Ralf DOT Habacker AT freenet DOT de>,
"Charles Wilson" <cwilson AT ece DOT gatech DOT edu>
Cc: "Binutils" <binutils AT sources DOT redhat DOT com>,
"Cygwin-Apps" <cygwin-apps AT cygwin DOT com>
Subject: RE: ordinal linking for cygwin ld
Date: Sun, 28 Apr 2002 14:17:38 +0200
Message-ID: <001b01c1eeae$afa0b670$d36707d5@BRAMSCHE>
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Importance: Normal

> Mostly. I'm a bit rusty - it's been a while since I grokked the
> auto-import stuff. I'm getting back into it at the moment. The thing
> that I don't follow at the moment is the how the linker fixup places the
> exported data -variable- at a fixed rva at dll load time. The IAT is
> -meant- to point straight to functions after the fixup occurs, so
> pointing at an address in the .dll .text segment is fine.
                                 ^^^^

Not into the dll, into the client code.

objdump -D client.exe
<snip>

401063:	a1 b8 40 40 00       	mov    0x4040b8,%eax
             | ^^^^^^^^^^
          opcode     address
00401064 :

Firstthunk points to 0x401064, the symbol <__fu0__var0000>, which is the address
part of the mov instruction. After run time linking the loader has relocated
this address to the propper value.

401063:	a1 ab cd ef 00       	mov    0x00efcdab,%eax

Ralf



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