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Commit 0a4949c4 authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
parent dbf3e950

arch/sparc64/kernel/signal.c

+4 −2
Original line number Original line Diff line number Diff line
@@ -2,7 +2,7 @@ 
 *  arch/sparc64/kernel/signal.c

 *  arch/sparc64/kernel/signal.c

 *

 *

 *  Copyright (C) 1991, 1992  Linus Torvalds

 *  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) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)

 *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)

 *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)

 *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)

 *  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_G4], (&(*grp)[MC_G4]));

	err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));

	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_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_I0], (&(*grp)[MC_O0]));

	err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));

	err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));

	err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));

	err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));