/*-
* Copyright (c) 1995, 2000, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Emmanuel Dreyfus.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* To see whether wscons is configured (for virtual console ioctl calls).
*/
#if defined(_KERNEL_OPT)
#include "wsdisplay.h"
#endif
#if (NWSDISPLAY > 0)
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplay_usl_io.h>
#endif
/*
* Set set up registers on exec.
*/
void
linux_setregs(struct lwp *l, struct exec_package *pack, vaddr_t stack)
{
setregs(l, pack, stack);
}
/*
* Send an interrupt to process.
*
* Adapted from arch/powerpc/powerpc/sig_machdep.c:sendsig and
* compat/linux/arch/i386/linux_machdep.c:linux_sendsig
*
* XXX Does not work well yet with RT signals
*
*/
/*
* Do we need to jump onto the signal stack?
*/
onstack =
(l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
(SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
/*
* Signal stack is broken (see at the end of linux_sigreturn), so we do
* not use it yet. XXX fix this.
*/
onstack=0;
/*
* Allocate space for the signal handler context.
*/
if (onstack) {
fp = (register_t)
((char *)l->l_sigstk.ss_sp +
l->l_sigstk.ss_size);
} else {
fp = tf->tf_fixreg[1];
}
#ifdef DEBUG_LINUX
printf("fp at start of linux_sendsig = %x\n", fp);
#endif
fp -= sizeof(struct linux_sigregs);
fp &= ~0xf;
/*
* Copy Linux's signal trampoline on the user stack It should not
* be used, but Linux binaries might expect it to be there.
*/
frame.ltramp[0] = 0x38997777; /* li r0, 0x7777 */
frame.ltramp[1] = 0x44000002; /* sc */
/*
* Move it to the user stack
* There is a little trick here, about the LINUX_ABIGAP: the
* linux_sigreg structure has a 56 int gap to support rs6000/xcoff
* binaries. But the Linux kernel seems to do without it, and it
* just skip it when building the stack frame. Hence the LINUX_ABIGAP.
*/
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout(&frame, (void *)fp, sizeof (frame) - LINUX_ABIGAP);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
mutex_enter(p->p_lock);
sigexit(l, SIGILL);
/* NOTREACHED */
}
/*
* Add a sigcontext on the stack
*/
fp -= sizeof(struct linux_sigcontext);
error = copyout(&sc, (void *)fp, sizeof (struct linux_sigcontext));
mutex_enter(p->p_lock);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
sigexit(l, SIGILL);
/* NOTREACHED */
}
/*
* Set the registers according to how the Linux process expects them.
* "Mind the gap" Linux expects a gap here.
*/
tf->tf_fixreg[1] = fp - LINUX__SIGNAL_FRAMESIZE;
tf->tf_lr = (int)catcher;
tf->tf_fixreg[3] = (int)native_to_linux_signo[sig];
tf->tf_fixreg[4] = fp;
tf->tf_srr0 = (int)p->p_sigctx.ps_sigcode;
#ifdef DEBUG_LINUX
printf("fp at end of linux_sendsig = %x\n", fp);
#endif
/*
* Remember that we're now on the signal stack.
*/
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
#ifdef DEBUG_LINUX
printf("linux_sendsig: exiting. fp=0x%lx\n",(long)fp);
#endif
}
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by sendsig (above).
* Return to previous pc and psl as specified by
* context left by sendsig. Check carefully to
* make sure that the user has not modified the
* psl to gain improper privileges or to cause
* a machine fault.
*
* XXX not tested
*/
int
linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *uap, register_t *retval)
{
/* {
syscallarg(struct linux_rt_sigframe *) sfp;
} */
struct proc *p = l->l_proc;
struct linux_rt_sigframe *scp, sigframe;
struct linux_sigregs sregs;
struct linux_pt_regs *lregs;
struct trapframe *tf;
sigset_t mask;
int i;
/*
* The trampoline code hands us the context.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
scp = SCARG(uap, sfp);
/*
* Get the context from user stack
*/
if (copyin((void *)scp, &sigframe, sizeof(*scp)))
return (EFAULT);
/*
* Restore signal stack.
*
* XXX cannot find the onstack information in Linux sig context.
* Is signal stack really supported on Linux?
*
* It seems to be supported in libc6...
*/
/* if (sc.sc_onstack & SS_ONSTACK)
l->l_sigstk.ss_flags |= SS_ONSTACK;
else */
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
/*
* Grab the signal mask
*/
linux_to_native_sigset(&mask, &sigframe.luc.luc_sigmask);
(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
/*
* The trampoline code hands us the context.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
scp = SCARG(uap, scp);
/*
* Get the context from user stack
*/
if (copyin(scp, &context, sizeof(*scp)))
return (EFAULT);
/*
* Restore signal stack.
*
* XXX cannot find the onstack information in Linux sig context.
* Is signal stack really supported on Linux?
*/
#if 0
if (sc.sc_onstack & SS_ONSTACK)
l->l_sigstk.ss_flags |= SS_ONSTACK;
else
#endif
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
/*
* major device numbers remapping
*/
dev_t
linux_fakedev(dev_t dev, int raw)
{
/* XXX write me */
return dev;
}
/*
* We come here in a last attempt to satisfy a Linux ioctl() call
*/
int
linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(u_long) com;
syscallarg(void *) data;
} */
struct sys_ioctl_args bia;
u_long com;
