Module Name: src
Committed By: maxv
Date: Tue Aug 1 14:43:54 UTC 2017
Modified Files:
src/sys/arch/i386/conf: files.i386
src/sys/arch/xen/conf: files.xen
src/sys/compat/freebsd: files.freebsd
src/sys/modules/compat_freebsd: Makefile
Added Files:
src/sys/compat/freebsd: freebsd_machdep.c freebsd_sigcode.S
freebsd_syscall.c
Removed Files:
src/sys/arch/i386/i386: freebsd_machdep.c freebsd_sigcode.S
freebsd_syscall.c
Log Message:
Move arch/i386/i386/freebsd_* into compat/freebsd/. COMPAT_FREEBSD is
i386-specific.
To generate a diff of this commit:
cvs rdiff -u -r1.382 -r1.383 src/sys/arch/i386/conf/files.i386
cvs rdiff -u -r1.60 -r0 src/sys/arch/i386/i386/freebsd_machdep.c
cvs rdiff -u -r1.5 -r0 src/sys/arch/i386/i386/freebsd_sigcode.S
cvs rdiff -u -r1.40 -r0 src/sys/arch/i386/i386/freebsd_syscall.c
cvs rdiff -u -r1.151 -r1.152 src/sys/arch/xen/conf/files.xen
cvs rdiff -u -r1.14 -r1.15 src/sys/compat/freebsd/files.freebsd
cvs rdiff -u -r0 -r1.1 src/sys/compat/freebsd/freebsd_machdep.c \
src/sys/compat/freebsd/freebsd_sigcode.S \
src/sys/compat/freebsd/freebsd_syscall.c
cvs rdiff -u -r1.4 -r1.5 src/sys/modules/compat_freebsd/Makefile
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/i386/conf/files.i386
diff -u src/sys/arch/i386/conf/files.i386:1.382 src/sys/arch/i386/conf/files.i386:1.383
--- src/sys/arch/i386/conf/files.i386:1.382 Tue Aug 1 13:47:49 2017
+++ src/sys/arch/i386/conf/files.i386 Tue Aug 1 14:43:54 2017
@@ -1,4 +1,4 @@
-# $NetBSD: files.i386,v 1.382 2017/08/01 13:47:49 maxv Exp $
+# $NetBSD: files.i386,v 1.383 2017/08/01 14:43:54 maxv Exp $
#
# new style config file for i386 architecture
#
@@ -340,9 +340,6 @@ file arch/x86/x86/linux_trap.c compat_l
# FreeBSD binary compatibility (COMPAT_FREEBSD)
include "compat/freebsd/files.freebsd"
-file arch/i386/i386/freebsd_machdep.c compat_freebsd
-file arch/i386/i386/freebsd_sigcode.S compat_freebsd
-file arch/i386/i386/freebsd_syscall.c compat_freebsd
# NDIS compatibilty (COMPAT_NDIS)
include "compat/ndis/files.ndis"
Index: src/sys/arch/xen/conf/files.xen
diff -u src/sys/arch/xen/conf/files.xen:1.151 src/sys/arch/xen/conf/files.xen:1.152
--- src/sys/arch/xen/conf/files.xen:1.151 Tue Aug 1 13:47:49 2017
+++ src/sys/arch/xen/conf/files.xen Tue Aug 1 14:43:54 2017
@@ -1,4 +1,4 @@
-# $NetBSD: files.xen,v 1.151 2017/08/01 13:47:49 maxv Exp $
+# $NetBSD: files.xen,v 1.152 2017/08/01 14:43:54 maxv Exp $
# NetBSD: files.x86,v 1.10 2003/10/08 17:30:00 bouyer Exp
# NetBSD: files.i386,v 1.254 2004/03/25 23:32:10 jmc Exp
@@ -334,9 +334,6 @@ file arch/x86/x86/linux_trap.c compat_l
# FreeBSD binary compatibility (COMPAT_FREEBSD)
include "compat/freebsd/files.freebsd"
-file arch/i386/i386/freebsd_machdep.c compat_freebsd
-file arch/i386/i386/freebsd_sigcode.S compat_freebsd
-file arch/i386/i386/freebsd_syscall.c compat_freebsd
elifdef amd64
Index: src/sys/compat/freebsd/files.freebsd
diff -u src/sys/compat/freebsd/files.freebsd:1.14 src/sys/compat/freebsd/files.freebsd:1.15
--- src/sys/compat/freebsd/files.freebsd:1.14 Sat Jul 29 10:39:48 2017
+++ src/sys/compat/freebsd/files.freebsd Tue Aug 1 14:43:54 2017
@@ -1,10 +1,7 @@
-# $NetBSD: files.freebsd,v 1.14 2017/07/29 10:39:48 maxv Exp $
+# $NetBSD: files.freebsd,v 1.15 2017/08/01 14:43:54 maxv Exp $
#
# Config file description for machine-independent FreeBSD compat code.
-# Included by ports that need it.
-
-# ports should define any machine-specific files they need in their
-# own file lists.
+# Included by ports that need it. Only i386 is supported.
define compat_freebsd
file compat/freebsd/freebsd_exec.c compat_freebsd
@@ -13,10 +10,14 @@ file compat/freebsd/freebsd_file.c comp
file compat/freebsd/freebsd_fork.c compat_freebsd
file compat/freebsd/freebsd_ioctl.c compat_freebsd
file compat/freebsd/freebsd_ipc.c compat_freebsd
+file compat/freebsd/freebsd_machdep.c compat_freebsd
file compat/freebsd/freebsd_misc.c compat_freebsd
file compat/freebsd/freebsd_mod.c compat_freebsd
file compat/freebsd/freebsd_ptrace.c compat_freebsd & ptrace
file compat/freebsd/freebsd_sched.c compat_freebsd
+file compat/freebsd/freebsd_sigcode.S compat_freebsd
file compat/freebsd/freebsd_sysctl.c compat_freebsd
file compat/freebsd/freebsd_sysent.c compat_freebsd
file compat/freebsd/freebsd_syscalls.c compat_freebsd
+file compat/freebsd/freebsd_syscall.c compat_freebsd
+
Index: src/sys/modules/compat_freebsd/Makefile
diff -u src/sys/modules/compat_freebsd/Makefile:1.4 src/sys/modules/compat_freebsd/Makefile:1.5
--- src/sys/modules/compat_freebsd/Makefile:1.4 Sat Jul 29 10:39:48 2017
+++ src/sys/modules/compat_freebsd/Makefile Tue Aug 1 14:43:54 2017
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.4 2017/07/29 10:39:48 maxv Exp $
+# $NetBSD: Makefile,v 1.5 2017/08/01 14:43:54 maxv Exp $
.include "../Makefile.inc"
.include "../Makefile.assym"
@@ -17,7 +17,6 @@ SRCS+= freebsd_sysctl.c freebsd_sysent.c
.if ${MACHINE_ARCH} == "i386"
CPPFLAGS+= -DEXEC_ELF32
-.PATH: ${S}/arch/i386/i386
SRCS+= freebsd_machdep.c freebsd_syscall.c freebsd_sigcode.S
.endif
Added files:
Index: src/sys/compat/freebsd/freebsd_machdep.c
diff -u /dev/null src/sys/compat/freebsd/freebsd_machdep.c:1.1
--- /dev/null Tue Aug 1 14:43:55 2017
+++ src/sys/compat/freebsd/freebsd_machdep.c Tue Aug 1 14:43:54 2017
@@ -0,0 +1,252 @@
+/* $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);
+}
+
Index: src/sys/compat/freebsd/freebsd_sigcode.S
diff -u /dev/null src/sys/compat/freebsd/freebsd_sigcode.S:1.1
--- /dev/null Tue Aug 1 14:43:55 2017
+++ src/sys/compat/freebsd/freebsd_sigcode.S Tue Aug 1 14:43:54 2017
@@ -0,0 +1,91 @@
+/* $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):
Index: src/sys/compat/freebsd/freebsd_syscall.c
diff -u /dev/null src/sys/compat/freebsd/freebsd_syscall.c:1.1
--- /dev/null Tue Aug 1 14:43:55 2017
+++ src/sys/compat/freebsd/freebsd_syscall.c Tue Aug 1 14:43:54 2017
@@ -0,0 +1,150 @@
+/* $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);
+}
