NetBSD-5.0.2/sys/compat/linux/arch/mips/linux_machdep.c
/* $NetBSD: linux_machdep.c,v 1.38 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 1.38 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 <sys/sysctl.h>
#include <sys/kauth.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/psl.h>
#include <machine/reg.h>
#include <machine/regnum.h>
#include <machine/vmparam.h>
#include <machine/locore.h>
#include <mips/cache.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);
return;
}
/*
* Send an interrupt to process.
*
* Adapted from sys/arch/mips/mips/mips_machdep.c
*
* 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 linux_sigframe *fp;
struct frame *f;
int i, onstack, error;
sig_t catcher = SIGACTION(p, sig).sa_handler;
struct linux_sigframe sf;
#ifdef DEBUG_LINUX
printf("linux_sendsig()\n");
#endif /* DEBUG_LINUX */
f = (struct frame *)l->l_md.md_regs;
/*
* 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 = (struct linux_sigframe *)
((uint8_t *)l->l_sigstk.ss_sp
+ l->l_sigstk.ss_size);
else
/* cast for _MIPS_BSD_API == _MIPS_BSD_API_LP32_64CLEAN case */
fp = (struct linux_sigframe *)(u_int32_t)f->f_regs[_R_SP];
/*
* Build stack frame for signal trampoline.
*/
memset(&sf, 0, sizeof sf);
/*
* This is the signal trampoline used by Linux, we don't use it,
* but we set it up in case an application expects it to be there
*/
sf.lsf_code[0] = 0x24020000; /* li v0, __NR_sigreturn */
sf.lsf_code[1] = 0x0000000c; /* syscall */
native_to_linux_sigset(&sf.lsf_mask, mask);
for (i=0; i<32; i++) {
sf.lsf_sc.lsc_regs[i] = f->f_regs[i];
}
sf.lsf_sc.lsc_mdhi = f->f_regs[_R_MULHI];
sf.lsf_sc.lsc_mdlo = f->f_regs[_R_MULLO];
sf.lsf_sc.lsc_pc = f->f_regs[_R_PC];
sf.lsf_sc.lsc_status = f->f_regs[_R_SR];
sf.lsf_sc.lsc_cause = f->f_regs[_R_CAUSE];
sf.lsf_sc.lsc_badvaddr = f->f_regs[_R_BADVADDR];
sendsig_reset(l, sig);
/*
* Save signal stack. XXX broken
*/
/* kregs.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; */
/*
* Install the sigframe onto the stack
*/
fp -= sizeof(struct linux_sigframe);
mutex_exit(p->p_lock);
error = copyout(&sf, fp, sizeof(sf));
mutex_enter(p->p_lock);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
#ifdef DEBUG_LINUX
printf("linux_sendsig: stack trashed\n");
#endif /* DEBUG_LINUX */
sigexit(l, SIGILL);
/* NOTREACHED */
}
/* Set up the registers to return to sigcode. */
f->f_regs[_R_A0] = native_to_linux_signo[sig];
f->f_regs[_R_A1] = 0;
f->f_regs[_R_A2] = (unsigned long)&fp->lsf_sc;
#ifdef DEBUG_LINUX
printf("sigcontext is at %p\n", &fp->lsf_sc);
#endif /* DEBUG_LINUX */
f->f_regs[_R_SP] = (unsigned long)fp;
/* Signal trampoline code is at base of user stack. */
f->f_regs[_R_RA] = (unsigned long)p->p_sigctx.ps_sigcode;
f->f_regs[_R_T9] = (unsigned long)catcher;
f->f_regs[_R_PC] = (unsigned long)catcher;
/* Remember that we're now on the signal stack. */
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
return;
}
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by sendsig (above).
*/
int
linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval)
{
/* {
syscallarg(struct linux_sigframe *) sf;
} */
struct proc *p = l->l_proc;
struct linux_sigframe *sf, ksf;
struct frame *f;
sigset_t mask;
int i, error;
#ifdef DEBUG_LINUX
printf("linux_sys_sigreturn()\n");
#endif /* DEBUG_LINUX */
/*
* 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.
*/
sf = SCARG(uap, sf);
if ((error = copyin(sf, &ksf, sizeof(ksf))) != 0)
return (error);
/* Restore the register context. */
f = (struct frame *)l->l_md.md_regs;
for (i=0; i<32; i++)
f->f_regs[i] = ksf.lsf_sc.lsc_regs[i];
f->f_regs[_R_MULLO] = ksf.lsf_sc.lsc_mdlo;
f->f_regs[_R_MULHI] = ksf.lsf_sc.lsc_mdhi;
f->f_regs[_R_PC] = ksf.lsf_sc.lsc_pc;
f->f_regs[_R_BADVADDR] = ksf.lsf_sc.lsc_badvaddr;
f->f_regs[_R_CAUSE] = ksf.lsf_sc.lsc_cause;
mutex_enter(p->p_lock);
/* Restore signal stack. */
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
/* Restore signal mask. */
linux_to_native_sigset(&mask, (linux_sigset_t *)&ksf.lsf_mask);
(void)sigprocmask1(l, SIG_SETMASK, &mask, 0);
mutex_exit(p->p_lock);
return (EJUSTRETURN);
}
int
linux_sys_rt_sigreturn(struct lwp *l, const void *v, register_t *retval)
{
return (ENOSYS);
}
#if 0
int
linux_sys_modify_ldt(struct lwp *l, const struct linux_sys_modify_ldt_args *uap, register_t *retval)
{
/*
* This syscall is not implemented in Linux/Mips: we should not
* be here
*/
#ifdef DEBUG_LINUX
printf("linux_sys_modify_ldt: should not be here.\n");
#endif /* DEBUG_LINUX */
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)
{
return 0;
}
/*
* 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/Mips: we should not be here
*/
#ifdef DEBUG_LINUX
printf("linux_sys_ioperm: should not be here.\n");
#endif /* DEBUG_LINUX */
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)
{
/*
* Use this if you want to try Linux emulation with a glibc-2.2
* or higher. Note that signals will not work
*/
#if 0
struct linux_sys_uname_args /* {
syscallarg(struct linux_utsname *) up;
} */ *uap = v;
struct linux_utsname luts;
strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname));
strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strlcpy(luts.l_release, "2.4.0", sizeof(luts.l_release));
strlcpy(luts.l_version, linux_version, sizeof(luts.l_version));
strlcpy(luts.l_machine, machine, sizeof(luts.l_machine));
strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
return copyout(&luts, SCARG(uap, up), sizeof(luts));
#else
return linux_sys_uname(l, (const void *)uap, retval);
#endif
}
/*
* In Linux, cacheflush is currently implemented
* as a whole cache flush (arguments are ignored)
* we emulate this broken beahior.
*/
int
linux_sys_cacheflush(struct lwp *l, const struct linux_sys_cacheflush_args *uap, register_t *retval)
{
mips_icache_sync_all();
mips_dcache_wbinv_all();
return 0;
}
/*
* This system call is depecated in Linux, but
* some binaries and some libraries use it.
*/
int
linux_sys_sysmips(struct lwp *l, const struct linux_sys_sysmips_args *uap, register_t *retval)
{
#if 0
struct linux_sys_sysmips_args {
syscallarg(int) cmd;
syscallarg(int) arg1;
syscallarg(int) arg2;
syscallarg(int) arg3;
} *uap = v;
#endif
int error;
switch (SCARG(uap, cmd)) {
case LINUX_SETNAME: {
char nodename [LINUX___NEW_UTS_LEN + 1];
int name[2];
size_t len;
if ((error = copyinstr((char *)SCARG(uap, arg1), nodename,
LINUX___NEW_UTS_LEN, &len)) != 0)
return error;
name[0] = CTL_KERN;
name[1] = KERN_HOSTNAME;
return (old_sysctl(&name[0], 2, 0, 0, nodename, len, NULL));
break;
}
case LINUX_MIPS_ATOMIC_SET: {
void *addr;
int s;
u_int8_t value = 0;
addr = (void *)SCARG(uap, arg1);
s = splhigh();
/*
* No error testing here. This is bad, but Linux does
* it like this. The source aknowledge "This is broken"
* in a comment...
*/
(void) copyin(addr, &value, 1);
*retval = value;
value = (u_int8_t) SCARG(uap, arg2);
error = copyout(&value, addr, 1);
splx(s);
return 0;
break;
}
case LINUX_MIPS_FIXADE: /* XXX not implemented */
break;
case LINUX_FLUSH_CACHE:
mips_icache_sync_all();
mips_dcache_wbinv_all();
break;
case LINUX_MIPS_RDNVRAM:
return EIO;
break;
default:
return EINVAL;
break;
}
#ifdef DEBUG_LINUX
printf("linux_sys_sysmips(): unimplemented command %d\n",
SCARG(uap,cmd));
#endif /* DEBUG_LINUX */
return 0;
}
int
linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
{
return 0;
}