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pwrite does not work right under qemu-sh4
The pwrite system call has no effect when writing to a non-zero file position, in a program running under qemu-sh4 (version 2.9.0).
How to reproduce:
- Compile the program:
sh4-linux-gnu-gcc-5 -O -Wall -static -o test-pwrite test-pwrite.c
- Set environment variable for using qemu-sh4 (actually not needed, since the program is statically linked here).
- ~/inst-qemu/2.9.0/bin/qemu-sh4 test-pwrite
Expected output:
buf = 01W3456789
Actual output:
buf = 0123456789
test-pwrite.c:56: assertion 'strcmp ("01W3456789",buf) == 0' failed
qemu: uncaught target signal 6 (Aborted) - core dumped
In case it matters: My host platform is Linux/x86_64.
The behaviour in qemu-2.10 is the same as in qemu-2.9.
This might be related to this fix:
> https://git.qemu.org/?p=qemu.git;a=commit;h=8bf8e9df4a7d82c7a47cc961c9cdee1615595de0
FWIW, if you're interested in sh4, please join #debian-ports on OFTC and subscribe to the debian-superh mailing list. We're doing lots of sh4 development and testing QEMU in Debian.
Works fine in qemu-2.11:
$ ~/inst-qemu/2.11.0/bin/qemu-sh4 test-pwrite
buf = 01W3456789
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