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NetBSD/sys/compat/linux/arch/mips/linux_machdep.c

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/* $NetBSD: linux_machdep.c,v 1.9 2001/11/20 21:50:13 manu 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 1.9 2001/11/20 21:50:13 manu Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/kernel.h>
#include <sys/map.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 <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 <machine/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(p, pack, stack)
struct proc *p;
struct exec_package *pack;
u_long stack;
{
setregs(p, 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(catcher, sig, mask, code) /* XXX Check me */
sig_t catcher;
int sig;
sigset_t *mask;
u_long code;
{
struct proc *p = curproc;
struct linux_sigframe *fp;
struct frame *f;
int i,onstack;
struct linux_sigframe sf;
#ifdef DEBUG_LINUX
printf("linux_sendsig()\n");
#endif /* DEBUG_LINUX */
f = (struct frame *)p->p_md.md_regs;
/*
* Do we need to jump onto the signal stack?
*/
onstack =
(p->p_sigctx.ps_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 *)
((caddr_t)p->p_sigctx.ps_sigstk.ss_sp
+ p->p_sigctx.ps_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[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(mask, &sf.lsf_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[MULHI];
sf.lsf_sc.lsc_mdlo = f->f_regs[MULLO];
sf.lsf_sc.lsc_pc = f->f_regs[PC];
sf.lsf_sc.lsc_status = f->f_regs[SR]; /* XXX */
sf.lsf_sc.lsc_cause = f->f_regs[CAUSE];
sf.lsf_sc.lsc_badvaddr = f->f_regs[BADVADDR]; /* XXX */
/*
* Save signal stack. XXX broken
*/
/* kregs.sc_onstack = p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK; */
/*
* Install the sigframe onto the stack
*/
fp -= sizeof(struct linux_sigframe);
if (copyout(&sf, fp, sizeof(sf)) != 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(p, SIGILL);
/* NOTREACHED */
}
/* Set up the registers to return to sigcode. */
f->f_regs[A0] = native_to_linux_sig[sig];
f->f_regs[A1] = 0;
f->f_regs[A2] = (unsigned long)&fp->lsf_sc;
#ifdef DEBUG_LINUX
printf("sigcontext is at %p\n", &fp->lsf_sc);
#endif /* DEBUG_LINUX */
f->f_regs[SP] = (unsigned long)fp;
/* Signal trampoline code is at base of user stack. */
f->f_regs[RA] = (unsigned long)p->p_sigctx.ps_sigcode;
f->f_regs[T9] = (unsigned long)catcher;
f->f_regs[PC] = (unsigned long)catcher;
/* Remember that we're now on the signal stack. */
if (onstack)
p->p_sigctx.ps_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(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_sigreturn_args /* {
syscallarg(struct linux_sigframe *) sf;
} */ *uap = v;
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 *)p->p_md.md_regs;
for (i=0; i<32; i++)
f->f_regs[i] = ksf.lsf_sc.lsc_regs[i];
f->f_regs[MULLO] = ksf.lsf_sc.lsc_mdlo;
f->f_regs[MULHI] = ksf.lsf_sc.lsc_mdhi;
f->f_regs[PC] = ksf.lsf_sc.lsc_pc;
f->f_regs[BADVADDR] = ksf.lsf_sc.lsc_badvaddr;
f->f_regs[CAUSE] = ksf.lsf_sc.lsc_cause;
f->f_regs[SR] = ksf.lsf_sc.lsc_status;
/* Restore signal stack. */
p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK;
/* Restore signal mask. */
linux_to_native_sigset((linux_sigset_t *)&ksf.lsf_mask, &mask);
(void)sigprocmask1(p, SIG_SETMASK, &mask, 0);
return (EJUSTRETURN);
}
int
linux_sys_rt_sigreturn(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
return 0;
}
#if 0
int
linux_sys_modify_ldt(p, v, retval)
struct proc *p;
void *v;
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)
dev_t dev;
{
/* XXX write me */
return dev;
}
/*
* We come here in a last attempt to satisfy a Linux ioctl() call
*/
int
linux_machdepioctl(p, v, retval)
struct proc *p;
void *v;
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(p, v, retval)
struct proc *p;
void *v;
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(p, v, retval)
struct proc *p;
void *v;
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;
strncpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname));
strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strncpy(luts.l_release, "2.4.0", sizeof(luts.l_release));
strncpy(luts.l_version, linux_version, sizeof(luts.l_version));
strncpy(luts.l_machine, machine, sizeof(luts.l_machine));
strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
return copyout(&luts, SCARG(uap, up), sizeof(luts));
#else
return linux_sys_uname(p, v, retval);
#endif
}
/*
* In Linux, cacheflush is icurrently implemented
* as a whole cache flush (arguments are ignored)
* we emulate this broken beahior.
*/
int
linux_sys_cacheflush(p, v, retval)
struct proc *p;
void *v;
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(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_sysmips_args {
syscallarg(int) cmd;
syscallarg(int) arg1;
syscallarg(int) arg2;
syscallarg(int) arg3;
} *uap = v;
int error;
switch (SCARG(uap, cmd)) {
case LINUX_SETNAME: {
char nodename [LINUX___NEW_UTS_LEN + 1];
int name;
size_t len;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return error;
if ((error = copyinstr((char *)SCARG(uap, arg1), nodename,
LINUX___NEW_UTS_LEN, &len)) != 0)
return error;
name = KERN_HOSTNAME;
return (kern_sysctl(&name, 1, 0, 0, nodename, len, p));
break;
}
case LINUX_MIPS_ATOMIC_SET: {
void *addr;
int s;
addr = (void *)SCARG(uap, arg1);
if ((uvm_useracc((caddr_t)addr, sizeof(int),
B_READ | B_WRITE)) != 1)
return EFAULT;
s = splhigh();
/*
* No error testing here. This is bad, but Linux does
* it like this. The source aknowledge "This is broken"
* in a comment...
*/
*retval = (register_t)fubyte(addr);
error = subyte(addr, SCARG(uap, arg2));
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;
}
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