Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0a4949...
Commit:     0a4949c4414af2eb91414bcd8e2a8ac3706f7dde
Parent:     dbf3e950679b2588e554baa4da94c445c7903e24
Author:     David S. Miller <davem@davemloft.net>
AuthorDate: Thu Jul 31 20:40:46 2008 -0700
Committer:  David S. Miller <davem@davemloft.net>
CommitDate: Thu Jul 31 20:40:46 2008 -0700

    sparc64: Do not clobber %g7 in setcontext() trap.
    
    That's the userland thread register, so we should never try to change
    it like this.
    
    Based upon glibc bug nptl/6577 and suggestions by Jakub Jelinek.
    
    Signed-off-by: David S. Miller <davem@davemloft.net>
---
 arch/sparc64/kernel/signal.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c
index d1b8445..ca5a6ae 100644
--- a/arch/sparc64/kernel/signal.c
+++ b/arch/sparc64/kernel/signal.c
@@ -2,7 +2,7 @@
  *  arch/sparc64/kernel/signal.c
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
- *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
  *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
@@ -91,7 +91,9 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs)
 	err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
 	err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
 	err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
-	err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
+
+	/* Skip %g7 as that's the thread register in userspace.  */
+
 	err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
 	err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
 	err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
--
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