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[Bug nptl/6577] New: SPARC64 get/setcontext smashes TLS
- From: "nwfilardo at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 28 May 2008 23:45:35 -0000
- Subject: [Bug nptl/6577] New: SPARC64 get/setcontext smashes TLS
- Reply-to: sourceware-bugzilla at sourceware dot org
(I'm not sure that this is libc's fault so apologies in advance if this is
noise and should be redirected. Please don't hesitate to ask for additional
information; I'm not sure what else I should provide.)
Doing a setcontext() on Linux/SPARC64 (kernel 2.6.26-rc4) using glibc 2.7
(Debian build 2.7-11) also writes over %g7, which is used to store the TLS
pointer for pthread_self() (see libc/nptl/sysdeps/sparc/tls.h). This breaks
plan9port's libthread but it will show up any time threads exchange or pool
contexts.
I've worked around it by manually setting uc_mcontext.mc_gregs[REG_G7] to
pthread_self() before calling setcontext; if this is the correct fix, it would
seem that setcontext() should be doing that itself.
Thanks for your time.
--
Summary: SPARC64 get/setcontext smashes TLS
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: nptl
AssignedTo: drepper at redhat dot com
ReportedBy: nwfilardo at gmail dot com
CC: glibc-bugs at sources dot redhat dot com
GCC host triplet: sparc-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=6577
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