diff options
| author | James Hogan <james.hogan@imgtec.com> | 2016-05-24 09:35:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-07 18:14:31 -0700 |
| commit | 1985bf8d711a562dd143be05f05707333fbf7c7b (patch) | |
| tree | bbd5df43840e5c116225953ab6680239d11b49eb /arch | |
| parent | 13defedff19cae72e2b88a120c03792b3610bb06 (diff) | |
MIPS: Fix sigreturn via VDSO on microMIPS kernel
commit 13eb192d10bcc9ac518d57356179071d603bcb4e upstream.
In microMIPS kernels, handle_signal() sets the isa16 mode bit in the
vdso address so that the sigreturn trampolines (which are offset from
the VDSO) get executed as microMIPS.
However commit ebb5e78cc634 ("MIPS: Initial implementation of a VDSO")
changed the offsets to come from the VDSO image, which already have the
isa16 mode bit set correctly since they're extracted from the VDSO
shared library symbol table.
Drop the isa16 mode bit handling from handle_signal() to fix sigreturn
for cores which support both microMIPS and normal MIPS. This doesn't fix
microMIPS only cores, since the VDSO is still built for normal MIPS, but
thats a separate problem.
Fixes: ebb5e78cc634 ("MIPS: Initial implementation of a VDSO")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13348/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/kernel/signal.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index fc7c1f0b3d8d..9e35b6b26aa8 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -770,15 +770,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) sigset_t *oldset = sigmask_to_save(); int ret; struct mips_abi *abi = current->thread.abi; -#ifdef CONFIG_CPU_MICROMIPS - void *vdso; - unsigned long tmp = (unsigned long)current->mm->context.vdso; - - set_isa16_mode(tmp); - vdso = (void *)tmp; -#else void *vdso = current->mm->context.vdso; -#endif if (regs->regs[0]) { switch(regs->regs[2]) { |