From 479d07e9cb7182e0e3f5292cc4aa75f509e25b69 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Tue, 24 May 2016 09:35:10 +0100 Subject: [PATCH] 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 d1c3d7de99d5 ("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: d1c3d7de99d5 ("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 --- arch/mips/kernel/signal.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index ab042291fbfd1..ae42314521156 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]) { -- 2.39.5