Move arch/i386/i386/freebsd_* into compat/freebsd/. COMPAT_FREEBSD is
i386-specific.


(maxv)

/*	$NetBSD: freebsd_machdep.c,v 1.1 2017/08/01 14:43:54 maxv Exp $	*/

/*-
 * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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: freebsd_machdep.c,v 1.1 2017/08/01 14:43:54 maxv Exp $");

#if defined(_KERNEL_OPT)
#include "opt_vm86.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/proc.h>
#include <sys/exec.h>
#include <sys/mount.h>

#include <compat/sys/signal.h>

#include <machine/cpufunc.h>
#include <x86/fpu.h>
#include <machine/reg.h>
#include <machine/vm86.h>
#include <machine/vmparam.h>
#include <machine/freebsd_machdep.h>


#include <compat/freebsd/freebsd_syscallargs.h>
#include <compat/freebsd/freebsd_exec.h>
#include <compat/freebsd/freebsd_signal.h>

void
freebsd_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack)
{

	setregs(l, epp, stack);
	fpu_set_default_cw(l, __FreeBSD_NPXCW__);
}

/*
 * signal support
 */

/*
 * Send an interrupt to process.
 *
 * Stack is set up to allow sigcode stored
 * in u. to call routine, followed by kcall
 * to sigreturn routine below.  After sigreturn
 * resets the signal mask, the stack, and the
 * frame pointer, it returns to the user
 * specified pc, psl.
 */
void
freebsd_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
{
	int sig = ksi->ksi_signo;
	u_long code = KSI_TRAPCODE(ksi);
	struct lwp *l = curlwp;
	struct proc *p = l->l_proc;
	int onstack, error;
	struct freebsd_sigframe *fp = getframe(l, sig, &onstack), frame;
	sig_t catcher = SIGACTION(p, sig).sa_handler;
	struct trapframe *tf = l->l_md.md_regs;

	fp--;

	/* Build stack frame for signal trampoline. */
	frame.sf_signum = sig;
	frame.sf_code = code;
	frame.sf_scp = &fp->sf_sc;
	frame.sf_addr = (char *)rcr2();
	frame.sf_handler = catcher;

	/* Save context. */
#ifdef VM86
	if (tf->tf_eflags & PSL_VM) {
		frame.sf_sc.sc_gs = tf->tf_vm86_gs;
		frame.sf_sc.sc_fs = tf->tf_vm86_fs;
		frame.sf_sc.sc_es = tf->tf_vm86_es;
		frame.sf_sc.sc_ds = tf->tf_vm86_ds;
		frame.sf_sc.sc_efl = get_vflags(l);
		(*p->p_emul->e_syscall_intern)(p);
	} else
#endif
	{
		frame.sf_sc.sc_gs = tf->tf_gs;
		frame.sf_sc.sc_fs = tf->tf_fs;
		frame.sf_sc.sc_es = tf->tf_es;
		frame.sf_sc.sc_ds = tf->tf_ds;
		frame.sf_sc.sc_efl = tf->tf_eflags;
	}
	frame.sf_sc.sc_edi = tf->tf_edi;
	frame.sf_sc.sc_esi = tf->tf_esi;
	frame.sf_sc.sc_ebp = tf->tf_ebp;
	frame.sf_sc.sc_isp = 0; /* don't have to pass kernel sp to user. */
	frame.sf_sc.sc_ebx = tf->tf_ebx;
	frame.sf_sc.sc_edx = tf->tf_edx;
	frame.sf_sc.sc_ecx = tf->tf_ecx;
	frame.sf_sc.sc_eax = tf->tf_eax;
	frame.sf_sc.sc_eip = tf->tf_eip;
	frame.sf_sc.sc_cs = tf->tf_cs;
	frame.sf_sc.sc_esp = tf->tf_esp;
	frame.sf_sc.sc_ss = tf->tf_ss;

	/* Save signal stack. */
	frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;

	/* Save signal mask. */
	/* XXX freebsd_osigcontext compat? */
	frame.sf_sc.sc_mask = *mask;

	sendsig_reset(l, sig);

	mutex_exit(p->p_lock);
	error = copyout(&frame, fp, sizeof(frame));
	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 */
	}

	buildcontext(l, GUCODEBIG_SEL, p->p_sigctx.ps_sigcode, fp);

	/* Remember that we're now on the signal stack. */
	if (onstack)
		l->l_sigstk.ss_flags |= SS_ONSTACK;
}

/*
 * 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.
 */
int
freebsd_sys_sigreturn(struct lwp *l, const struct freebsd_sys_sigreturn_args *uap, register_t *retval)
{
	/* {
		syscallarg(struct freebsd_sigcontext *) scp;
	} */
	struct proc *p = l->l_proc;
	struct freebsd_sigcontext *scp, context;
	struct trapframe *tf;
	sigset_t mask;

	/*
	 * 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);
	if (copyin((void *)scp, &context, sizeof(*scp)) != 0)
		return (EFAULT);

	/* Restore register context. */
	tf = l->l_md.md_regs;
#ifdef VM86
	if (context.sc_efl & PSL_VM) {
		void syscall_vm86(struct trapframe *);

		tf->tf_vm86_gs = context.sc_gs;
		tf->tf_vm86_fs = context.sc_fs;
		tf->tf_vm86_es = context.sc_es;
		tf->tf_vm86_ds = context.sc_ds;
		set_vflags(l, context.sc_efl);
		p->p_md.md_syscall = syscall_vm86;
	} else
#endif
	{
		/*
		 * Check for security violations.  If we're returning to
		 * protected mode, the CPU will validate the segment registers
		 * automatically and generate a trap on violations.  We handle
		 * the trap, rather than doing all of the checking here.
		 */
		if (((context.sc_efl ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 ||
		    !USERMODE(context.sc_cs, context.sc_efl))
			return (EINVAL);

		tf->tf_gs = context.sc_gs;
		tf->tf_fs = context.sc_fs;
		tf->tf_es = context.sc_es;
		tf->tf_ds = context.sc_ds;
		tf->tf_eflags &= ~PSL_USER;
		tf->tf_eflags |= context.sc_efl & PSL_USER;
	}
	tf->tf_edi = context.sc_edi;
	tf->tf_esi = context.sc_esi;
	tf->tf_ebp = context.sc_ebp;
	/* FreeBSD's context.sc_isp is useless. (`popal' ignores it.) */
	tf->tf_ebx = context.sc_ebx;
	tf->tf_edx = context.sc_edx;
	tf->tf_ecx = context.sc_ecx;
	tf->tf_eax = context.sc_eax;
	tf->tf_eip = context.sc_eip;
	tf->tf_cs = context.sc_cs;
	tf->tf_esp = context.sc_esp;
	tf->tf_ss = context.sc_ss;

	mutex_enter(p->p_lock);
	/* Restore signal stack. */
	if (context.sc_onstack & SS_ONSTACK)
		l->l_sigstk.ss_flags |= SS_ONSTACK;
	else
		l->l_sigstk.ss_flags &= ~SS_ONSTACK;
	/* Restore signal mask. */
	/* XXX freebsd_osigcontext compat? */
	mask = context.sc_mask;
	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
	mutex_exit(p->p_lock);

	return (EJUSTRETURN);
}

/*	$NetBSD: freebsd_sigcode.S,v 1.1 2017/08/01 14:43:54 maxv Exp $	*/

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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.
 */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * 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. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)locore.s	7.3 (Berkeley) 5/13/91
 */

#include <machine/asm.h>
__KERNEL_RCSID(0, "$NetBSD: freebsd_sigcode.S,v 1.1 2017/08/01 14:43:54 maxv Exp $");

#include "assym.h"

#include <sys/errno.h>
#include <sys/syscall.h>

#include <compat/freebsd/freebsd_syscall.h>

/*
 * Signal trampoline; copied to top of user stack.
 */
/* LINTSTUB: Var: char freebsd_sigcode[1], freebsd_esigcode[1]; */
NENTRY(freebsd_sigcode)
	call	*FREEBSD_SIGF_HANDLER(%esp)
	leal	FREEBSD_SIGF_SC(%esp),%eax # scp (the call may have clobbered
					# the copy at SIGF_SCP(%esp))
	pushl	%eax
	pushl	%eax			# junk to fake return address
	movl	$FREEBSD_SYS_sigreturn,%eax
	int	$0x80	 		# enter kernel with args on stack
	movl	$FREEBSD_SYS_exit,%eax
	int	$0x80			# exit if sigreturn fails
	.globl	_C_LABEL(freebsd_esigcode)
_C_LABEL(freebsd_esigcode):

/*	$NetBSD: freebsd_syscall.c,v 1.1 2017/08/01 14:43:54 maxv Exp $	*/

/*-
 * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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: freebsd_syscall.c,v 1.1 2017/08/01 14:43:54 maxv Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/syscall.h>
#include <sys/syscallvar.h>

#include <uvm/uvm_extern.h>

#include <machine/cpu.h>
#include <machine/psl.h>
#include <machine/userret.h>

#include <compat/sys/signal.h>

#include <machine/freebsd_machdep.h>
#include <compat/freebsd/freebsd_syscall.h>

void freebsd_syscall(struct trapframe *);

void
freebsd_syscall_intern(struct proc *p)
{

	p->p_md.md_syscall = freebsd_syscall;
}

/*
 * syscall(frame):
 *	System call request from POSIX system call gate interface to kernel.
 * Like trap(), argument is call by reference.
 */
void
freebsd_syscall(struct trapframe *frame)
{
	char *params;
	const struct sysent *callp;
	struct lwp *l;
	struct proc *p;
	int error;
	size_t argsize;
	register_t code, args[8], rval[2];

	l = curlwp;
	p = l->l_proc;
	LWP_CACHE_CREDS(l, p);

	code = frame->tf_eax;
	callp = p->p_emul->e_sysent;
	params = (char *)frame->tf_esp + sizeof(int);

	switch (code) {
	case SYS_syscall:
		/*
		 * Code is first argument, followed by actual args.
		 */
		code = fuword(params);
		params += sizeof(int);
		break;
	case SYS___syscall:
		/*
		 * Like syscall, but code is a quad, so as to maintain
		 * quad alignment for the rest of the arguments.
		 */
		code = fuword(params + _QUAD_LOWWORD * sizeof(int));
		params += sizeof(quad_t);
		break;
	default:
		break;
	}

	code &= (SYS_NSYSENT - 1);
	callp += code;
	argsize = callp->sy_argsize;
	if (argsize) {
		error = copyin(params, (void *)args, argsize);
		if (error)
			goto bad;
	}

	if (!__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_entry))
	    || (error = trace_enter(code, callp, args)) == 0) {
		rval[0] = 0;
		rval[1] = frame->tf_edx; /* need to keep edx for shared FreeBSD bins */
		error = sy_call(callp, l, args, rval);
	}

	switch (error) {
	case 0:
		frame->tf_eax = rval[0];
		frame->tf_edx = rval[1];
		frame->tf_eflags &= ~PSL_C;	/* carry bit */
		break;
	case ERESTART:
		/*
		 * The offset to adjust the PC by depends on whether we entered
		 * the kernel through the trap or call gate.  We pushed the
		 * size of the instruction into tf_err on entry.
		 */
		frame->tf_eip -= frame->tf_err;
		break;
	case EJUSTRETURN:
		/* nothing to do */
		break;
	default:
	bad:
		frame->tf_eax = error;
		frame->tf_eflags |= PSL_C;	/* carry bit */
		break;
	}

	if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_return)))
		trace_exit(code, callp, args, rval, error);

	userret(l);
}