Re: Finding the architectures of a binary
Re: Finding the architectures of a binary
- Subject: Re: Finding the architectures of a binary
- From: Iceberg-Dev <email@hidden>
- Date: Mon, 10 Nov 2008 19:20:19 +0100
On Nov 10, 2008, at 7:06 PM, Clark Cox wrote:
On Mon, Nov 10, 2008 at 9:23 AM, Iceberg-Dev
<email@hidden> wrote:
On Nov 10, 2008, at 4:08 PM, Finlay Dobbie wrote:
http://www.opensource.apple.com/darwinsource/10.5.5/cctools-667.3/
misc/lipo.c
Thanks.
Is it supoosed to be up-to-date and 64-bit compatible?
I'm asking because for instance, this line looks suspicious:
(*((unsigned long *)addr) == MH_MAGIC ||
What looks suspicious about it?
The ability to run this code as a 64-bit executable.
The magic cookie is a 32-bit value. AFAIK, if you build a 64-bit
executable and use unsigned long, it's a 64-bit value.
With a PowerPC, I'm not sure you can guarantee that the higher 4
bytes will be equal to 0x00000000 as the magic cookie can be the
first 4 bytes of a file (non fat). With an Intel Mac, the issue would
be different, since it would assume that the 4 bytes after the magic
cookie in the binary should be 0x00000000 instead of the cpu_type.
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