From: James Hogan Date: Tue, 24 May 2016 08:35:10 +0000 (+0100) Subject: MIPS: Fix sigreturn via VDSO on microMIPS kernel X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=13eb192d10bcc9ac518d57356179071d603bcb4e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git MIPS: Fix sigreturn via VDSO on microMIPS kernel 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 Cc: Paul Burton Cc: linux-mips@linux-mips.org Cc: # 4.4.x- Patchwork: https://patchwork.linux-mips.org/patch/13348/ Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index ab042291fbfd..ae4231452115 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]) {