NetBSD-5.0.2/sys/compat/linux/arch/powerpc/linux_machdep.c
/* $NetBSD: linux_machdep.c,v 1.39 2008/04/28 20:23:43 martin Exp $ */
/*-
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.39 2008/04/28 20:23:43 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/buf.h>
#include <sys/reboot.h>
#include <sys/conf.h>
#include <sys/exec.h>
#include <sys/file.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/msgbuf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/device.h>
#include <sys/syscallargs.h>
#include <sys/filedesc.h>
#include <sys/exec_elf.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <miscfs/specfs/specdev.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_ioctl.h>
#include <compat/linux/common/linux_hdio.h>
#include <compat/linux/common/linux_exec.h>
#include <compat/linux/common/linux_machdep.h>
#include <compat/linux/linux_syscallargs.h>
#include <sys/cpu.h>
#include <machine/fpu.h>
#include <machine/psl.h>
#include <machine/reg.h>
#include <machine/vmparam.h>
/*
* 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.
* XXX not used at the moment since in sys/kern/exec_conf, LINUX_COMPAT
* entry uses NetBSD's native setregs instead of linux_setregs
*/
void
linux_setregs(struct lwp *l, struct exec_package *pack, u_long 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
*
*/
void
linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
{
const int sig = ksi->ksi_signo;
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct trapframe *tf;
sig_t catcher = SIGACTION(p, sig).sa_handler;
struct linux_sigregs frame;
struct linux_pt_regs linux_regs;
struct linux_sigcontext sc;
register_t fp;
int onstack, error;
int i;
tf = trapframe(l);
/*
* 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->fixreg[1];
}
#ifdef DEBUG_LINUX
printf("fp at start of linux_sendsig = %x\n", fp);
#endif
fp -= sizeof(struct linux_sigregs);
fp &= ~0xf;
/*
* Prepare a sigcontext for later.
*/
memset(&sc, 0, sizeof sc);
sc.lsignal = (int)native_to_linux_signo[sig];
sc.lhandler = (unsigned long)catcher;
native_to_linux_old_extra_sigset(&sc.lmask, &sc._unused[3], mask);
sc.lregs = (struct linux_pt_regs*)fp;
/*
* Setup the signal stack frame as Linux does it in
* arch/ppc/kernel/signal.c:setup_frame()
*
* Save register context.
*/
for (i = 0; i < 32; i++)
linux_regs.lgpr[i] = tf->fixreg[i];
linux_regs.lnip = tf->srr0;
linux_regs.lmsr = tf->srr1 & PSL_USERSRR1;
linux_regs.lorig_gpr3 = tf->fixreg[3]; /* XXX Is that right? */
linux_regs.lctr = tf->ctr;
linux_regs.llink = tf->lr;
linux_regs.lxer = tf->xer;
linux_regs.lccr = tf->cr;
linux_regs.lmq = 0; /* Unused, 601 only */
linux_regs.ltrap = tf->exc;
linux_regs.ldar = tf->dar;
linux_regs.ldsisr = tf->dsisr;
linux_regs.lresult = 0;
memset(&frame, 0, sizeof(frame));
memcpy(&frame.lgp_regs, &linux_regs, sizeof(linux_regs));
save_fpu_lwp(curlwp, FPU_SAVE);
memcpy(&frame.lfp_regs, curpcb->pcb_fpu.fpreg, sizeof(frame.lfp_regs));
/*
* 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->fixreg[1] = fp - LINUX__SIGNAL_FRAMESIZE;
tf->lr = (int)catcher;
tf->fixreg[3] = (int)native_to_linux_signo[sig];
tf->fixreg[4] = fp;
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: exitting. 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 register context.
*/
if (copyin((void *)sigframe.luc.luc_context.lregs,
&sregs, sizeof(sregs)))
return (EFAULT);
lregs = (struct linux_pt_regs *)&sregs.lgp_regs;
tf = trapframe(l);
#ifdef DEBUG_LINUX
(unsigned long)tf, (unsigned long)scp);
#endif
if (!PSL_USEROK_P(lregs->lmsr))
return (EINVAL);
for (i = 0; i < 32; i++)
tf->fixreg[i] = lregs->lgpr[i];
tf->lr = lregs->llink;
tf->cr = lregs->lccr;
tf->xer = lregs->lxer;
tf->ctr = lregs->lctr;
tf->srr0 = lregs->lnip;
tf->srr1 = lregs->lmsr;
/*
* Make sure the fpu state is discarded
*/
save_fpu_lwp(curlwp, FPU_DISCARD);
memcpy(curpcb->pcb_fpu.fpreg, (void *)&sregs.lfp_regs,
sizeof(curpcb->pcb_fpu.fpreg));
mutex_enter(p->p_lock);
/*
* 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);
mutex_exit(p->p_lock);
return (EJUSTRETURN);
}
/*
* The following needs code review for potential security issues
*/
int
linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval)
{
/* {
syscallarg(struct linux_sigcontext *) scp;
} */
struct proc *p = l->l_proc;
struct linux_sigcontext *scp, context;
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, scp);
/*
* Get the context from user stack
*/
if (copyin(scp, &context, sizeof(*scp)))
return (EFAULT);
/*
* Restore register context.
*/
if (copyin((void *)context.lregs, &sregs, sizeof(sregs)))
return (EFAULT);
lregs = (struct linux_pt_regs *)&sregs.lgp_regs;
tf = trapframe(l);
#ifdef DEBUG_LINUX
printf("linux_sys_sigreturn: trapframe=0x%lx scp=0x%lx\n",
(unsigned long)tf, (unsigned long)scp);
#endif
if (!PSL_USEROK_P(lregs->lmsr))
return (EINVAL);
for (i = 0; i < 32; i++)
tf->fixreg[i] = lregs->lgpr[i];
tf->lr = lregs->llink;
tf->cr = lregs->lccr;
tf->xer = lregs->lxer;
tf->ctr = lregs->lctr;
tf->srr0 = lregs->lnip;
tf->srr1 = lregs->lmsr;
/*
* Make sure the fpu state is discarded
*/
save_fpu_lwp(curlwp, FPU_DISCARD);
memcpy(curpcb->pcb_fpu.fpreg, (void *)&sregs.lfp_regs,
sizeof(curpcb->pcb_fpu.fpreg));
mutex_enter(p->p_lock);
/*
* 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;
/* Restore signal mask. */
linux_old_extra_to_native_sigset(&mask, &context.lmask,
&context._unused[3]);
(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
mutex_exit(p->p_lock);
return (EJUSTRETURN);
}
#if 0
int
linux_sys_modify_ldt(struct proc *p, void *v, register_t *retval)
{
/*
* This syscall is not implemented in Linux/PowerPC: we should not
* be here
*/
#ifdef DEBUG_LINUX
printf("linux_sys_modify_ldt: should not be here.\n");
#endif
return 0;
}
#endif
/*
* 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;
SCARG(&bia, fd) = SCARG(uap, fd);
SCARG(&bia, data) = SCARG(uap, data);
com = SCARG(uap, com);
switch (com) {
default:
printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
return EINVAL;
}
SCARG(&bia, com) = com;
/* XXX NJWLWP */
return sys_ioctl(curlwp, &bia, retval);
}
#if 0
/*
* Set I/O permissions for a process. Just set the maximum level
* right away (ignoring the argument), otherwise we would have
* to rely on I/O permission maps, which are not implemented.
*/
int
linux_sys_iopl(struct lwp *l, const void *v, register_t *retval)
{
/*
* This syscall is not implemented in Linux/PowerPC: we should not be here
*/
#ifdef DEBUG_LINUX
printf("linux_sys_iopl: should not be here.\n");
#endif
return 0;
}
#endif
/*
* See above. If a root process tries to set access to an I/O port,
* just let it have the whole range.
*/
int
linux_sys_ioperm(struct lwp *l, const struct linux_sys_ioperm_args *uap, register_t *retval)
{
/*
* This syscall is not implemented in Linux/PowerPC: we should not be here
*/
#ifdef DEBUG_LINUX
printf("linux_sys_ioperm: should not be here.\n");
#endif
return 0;
}
/*
* wrapper linux_sys_new_uname() -> linux_sys_uname()
*/
int
linux_sys_new_uname(struct lwp *l, const struct linux_sys_new_uname_args *uap, register_t *retval)
{
return linux_sys_uname(l, (const void *)uap, retval);
}
/*
* wrapper linux_sys_new_select() -> linux_sys_select()
*/
int
linux_sys_new_select(struct lwp *l, const struct linux_sys_new_select_args *uap, register_t *retval)
{
return linux_sys_select(l, (const void *)uap, retval);
}
int
linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
{
return 0;
}