Re: [Qemu-devel] Alpha update

[Fabrice Bellard <fabrice.bellard@free.fr>]

Falk Hueffner wrote:
 > Hi,
 >
 > this patch does gp and __op_param handling correctly, following a
 > suggestion from Richard Henderson. Also adds support for PC-relative
 > jumps. I believe the translation engine itself is now complete. And I
 > added an Alpha disassembler lifted from binutils.
 >
 > 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?

Hi,

I commited your latest patches for Alpha.

For the mmap problem, I will integrate something like mmap4k, but I need
to make some patches in it so that the 'pagemap' stuff can be used in
the CPU emulator to handle self-modifying code and explicit translation
cache invalidation.

BTW, it was mentionned that variable host page size support was
necessary. Would a configure time probe be OK or should it be
dynamically probed ?

Fabrice.