From 19f9a34f87c48bbd270d617d1c986d0c23866a1a Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Wed, 27 Sep 2006 18:33:49 +0900 Subject: sh: Initial vsyscall page support. This implements initial support for the vsyscall page on SH. At the moment we leave it configurable due to having nommu to support from the same code base. We hook it up for the signal trampoline return at present, with more to be added later, once uClibc catches up. Signed-off-by: Paul Mundt --- arch/sh/kernel/signal.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) (limited to 'arch/sh/kernel/signal.c') diff --git a/arch/sh/kernel/signal.c b/arch/sh/kernel/signal.c index 2f1c9545b49f..5213f5bc6ce0 100644 --- a/arch/sh/kernel/signal.c +++ b/arch/sh/kernel/signal.c @@ -8,7 +8,6 @@ * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima * */ - #include #include #include @@ -21,6 +20,7 @@ #include #include #include +#include #include #include @@ -29,8 +29,6 @@ #include #include -#undef DEBUG - #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) /* @@ -312,6 +310,11 @@ get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) return (void __user *)((sp - frame_size) & -8ul); } +/* These symbols are defined with the addresses in the vsyscall page. + See vsyscall-trapa.S. */ +extern void __user __kernel_sigreturn; +extern void __user __kernel_rt_sigreturn; + static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs) { @@ -340,6 +343,10 @@ static int setup_frame(int sig, struct k_sigaction *ka, already in userspace. */ if (ka->sa.sa_flags & SA_RESTORER) { regs->pr = (unsigned long) ka->sa.sa_restorer; +#ifdef CONFIG_VSYSCALL + } else if (likely(current->mm->context.vdso)) { + regs->pr = VDSO_SYM(&__kernel_sigreturn); +#endif } else { /* Generate return code (system call to sigreturn) */ err |= __put_user(MOVW(7), &frame->retcode[0]); @@ -416,6 +423,10 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, already in userspace. */ if (ka->sa.sa_flags & SA_RESTORER) { regs->pr = (unsigned long) ka->sa.sa_restorer; +#ifdef CONFIG_VSYSCALL + } else if (likely(current->mm->context.vdso)) { + regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); +#endif } else { /* Generate return code (system call to rt_sigreturn) */ err |= __put_user(MOVW(7), &frame->retcode[0]); -- cgit v1.2.3