0000179: QEMU seems to not support CAS in user mode, causing two testsuite tests to fail

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Severity

Reproducibility

Date Submitted

Last Update

0000179

[libFirm] tools/scripts

minor

always

2016-10-04 09:06

2017-05-08 16:16

Reporter

mohr

View Status

public

Assigned To

Priority

normal

Resolution

open

Status

new

Product Version

Summary

0000179: QEMU seems to not support CAS in user mode, causing two testsuite tests to fail

Description

The tests sparccode/asm.c (*) and sparccode/cas.c in our testsuite fail with SIGILL because QEMU seems not to support the CAS(A) instruction in user mode.

See http://git.qemu.org/?p=qemu.git;a=commitdiff;h=16c358e96e0597b7d60754547166ad05ecc6d93d [^] for the commit that added CAS support; it is protected with "#if !defined(CONFIG_USER_ONLY)", which is set to 1 in the qemu user mode variant we use for the testsuite. I have no idea why this restriction is in place and asking a question in QEMU's IRC channel also didn't provide any clues.

(*) The tests seems to pass but only because use of CAS is protected by "#ifdef leon", which is only set by our internal preprocessor. However, as we cross-compile to SPARC, cparser forces usage of the external preprocessor, so the alternative code path without CAS is compiled.

Additional Information

Issue History
Date Modified	Username	Field	Change
2016-10-04 09:06	mohr	New Issue
2017-05-08 16:16	waldgrasgeniesser	Note Added: 0000297

Notes
(0000297) waldgrasgeniesser (reporter) 2017-05-08 16:16	I don't care that you broke your elbow.

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