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Date: Mon, 12 May 2003 00:27:26 +0200
From: Fabrice Bellard <fabrice.bellard@free.fr>
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Subject: Re: [Qemu-devel] Alpha update
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To: qemu-devel@nongnu.org

Fabrice Bellard wrote:
>  > However, there are still problems with the ELF loader. It seems like
>  > some binaries want a mmaping at an offset that is not divisible by the
>  > page size:
>  >
>  > ./qemu -d /usr/local/qemu-i386/bin/ls-i386
>  > [...]
>  > mmap4k(start = 0x8052000, length = 592, prot = 0x3 (rw),
>  >        flags = 0x2102 (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
>  >        fd = 4, offset = 39040)
>  >
>  > 39040 % 4096 == 2176
>  >
>  > Alpha Linux 2.5.69 doesn't seem to handle unaligned offsets. Do other
>  > architecures? Or earlier versions? The em86 code doesn't seem to care
>  > about this at all. The only thing to handle this I can think of is to
>  > mmap anonymously and use read() to fill in the data... or am I missing
>  > something?

I don't see how it is possible in this particular case: the ELF file is 
built to be mapped directly in memory so it is a bug in the ELF loader 
logic.

Note: The 2.4.x kernel also refuses unaligned offsets on i386.

Fabrice.