diff options
| author | David S. Miller <davem@davemloft.net> | 2008-07-31 20:40:46 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-07-31 20:40:46 -0700 |
| commit | 0a4949c4414af2eb91414bcd8e2a8ac3706f7dde (patch) | |
| tree | 5f05f6f539741587127900bbdd838a2e882fcdbf | |
| parent | dbf3e950679b2588e554baa4da94c445c7903e24 (diff) | |
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>
| -rw-r--r-- | 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 d1b84456a9e..ca5a6ae3a6e 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])); |