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| author | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2016-04-09 12:25:12 +0100 |
|---|---|---|
| committer | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2016-04-11 16:25:07 +0100 |
| commit | 4553e10360a0713e31647220ed396942f9a6fca0 (patch) | |
| tree | c7e45993f99ac463c921b27a6ff984bdde26e700 /spice-qemu-char.c | |
| parent | dc1ffa66619b3661f17a309b0aa8d65d8d29583f (diff) | |
| download | qemu-4553e10360a0713e31647220ed396942f9a6fca0.zip qemu-4553e10360a0713e31647220ed396942f9a6fca0.tar.gz qemu-4553e10360a0713e31647220ed396942f9a6fca0.tar.bz2 | |
target-sparc: fix ldstub sign-extension bug
ldstub [addr], reg incorrectly reads a signed byte from memory which causes
problems in the 32-bit Solaris mutex code. Here the byte value being read is
0xff which is incorrectly sign-extended to 0xffffffff before being written back
to the target register causing lock detection to behave incorrectly.
This fixes the intermittent hangs and MUTEX_HELD warnings issued to the
console when running 32-bit Solaris images under qemu-system-sparc.
With thanks to Joseph Dery for providing a condensed test image to consistently
reproduce the problem on demand, and Martin Husemann for allowing me access to
real hardware for comparison.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-By: Artyom Tarasenko <atar4qemu@gmail.com>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Diffstat (limited to 'spice-qemu-char.c')
0 files changed, 0 insertions, 0 deletions