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authorMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>2016-04-09 12:25:12 +0100
committerMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>2016-04-11 16:25:07 +0100
commit4553e10360a0713e31647220ed396942f9a6fca0 (patch)
treec7e45993f99ac463c921b27a6ff984bdde26e700 /accel.c
parentdc1ffa66619b3661f17a309b0aa8d65d8d29583f (diff)
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 'accel.c')
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