First incarnation of our Linux emulator or rather compatibility code.

This first shot only incorporaties so much functionality that DOOM
can run (the X version), signal handling is VERY weak, so is many
other things. But it meets my milestone number one (you guessed it
- running DOOM).

Uses /compat/linux as prefix for loading shared libs, so it won't
conflict with our own libs.

Kernel must be compiled with "options COMPAT_LINUX" for this to work.

1 files changed, 259 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_signal.c b/sys/compat/linux/linux_signal.c
new file mode 100644
index 0000000..528bb62
--- /dev/null
+++ b/sys/compat/linux/linux_signal.c
@@ -0,0 +1,259 @@
+/*-
+ * Copyright (c) 1994-1995 Søren Schmidt
+ * All rights reserved.
+ *
+ * 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 
+ *    in this position and unchanged.
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ *  $Id: linux_signal.c,v 1.2 1995/06/07 21:27:57 sos Exp $
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/exec.h>
+#include <sys/signal.h>
+#include <sys/signalvar.h>
+
+#include <vm/vm.h>
+
+#include <i386/linux/linux.h>
+
+#define DONTMASK    (sigmask(SIGKILL)|sigmask(SIGSTOP)|sigmask(SIGCHLD))
+
+static sigset_t
+linux_to_bsd_sigmask(linux_sigset_t mask) {
+    int i;
+    sigset_t new = 0;
+
+    for (i = 1; i <= LINUX_NSIG; i++)
+	if (mask & (1 << i-1))
+	    new |= (1 << (linux_to_bsd_signal[i]-1));
+    return new;
+}
+
+static linux_sigset_t
+bsd_to_linux_sigmask(sigset_t mask) {
+    int i;
+    sigset_t new = 0;
+
+    for (i = 1; i <= NSIG; i++)
+	if (mask & (1 << i-1))
+	    new |= (1 << (bsd_to_linux_signal[i]-1));
+    return new;
+}
+
+struct linux_sigaction_args {
+    int sig;
+    linux_sigaction_t *nsa;
+    linux_sigaction_t *osa;
+};
+
+int
+linux_sigaction(struct proc *p, struct linux_sigaction_args *args, int *retval)
+{
+    linux_sigaction_t linux_sa;
+    struct sigaction *nsa = NULL, *osa = NULL, bsd_sa;
+    struct sigaction_args {
+	int sig;
+	struct sigaction *nsa;
+	struct sigaction *osa;
+    } sa;
+    int error;
+    
+#ifdef DEBUG
+    printf("Linux-emul(%d): sigaction(%d, *, *)\n", p->p_pid, args->sig);
+#endif
+    if (args->osa)
+	osa = (struct sigaction *)ua_alloc_init(sizeof(struct sigaction));
+
+    if (args->nsa) {
+	nsa = (struct sigaction *)ua_alloc(sizeof(struct sigaction));
+	if (error = copyin(args->nsa, &linux_sa, sizeof(linux_sigaction_t)))
+	    return error;
+	bsd_sa.sa_mask = linux_to_bsd_sigmask(linux_sa.sa_mask);
+	bsd_sa.sa_handler = linux_sa.sa_handler;
+	bsd_sa.sa_flags = 0;
+	if (linux_sa.sa_flags & LINUX_SA_NOCLDSTOP)
+	    bsd_sa.sa_flags |= SA_NOCLDSTOP;
+	if (linux_sa.sa_flags & LINUX_SA_ONSTACK)
+	    bsd_sa.sa_flags |= SA_ONSTACK;
+	if (linux_sa.sa_flags & LINUX_SA_RESTART)
+	    bsd_sa.sa_flags |= SA_RESTART;
+	if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction)))
+	    return error;
+    }
+    sa.sig = linux_to_bsd_signal[args->sig];
+    sa.nsa = nsa;
+    sa.osa = osa;
+    if ((error = sigaction(p, &sa, retval)))
+	return error;
+
+    if (args->osa) {
+	if (error = copyin(osa, &bsd_sa, sizeof(struct sigaction)))
+	    return error;
+	linux_sa.sa_handler = bsd_sa.sa_handler;
+	linux_sa.sa_restorer = NULL;
+	linux_sa.sa_mask = bsd_to_linux_sigmask(bsd_sa.sa_mask);
+	linux_sa.sa_flags = 0;
+	if (bsd_sa.sa_flags & SA_NOCLDSTOP)
+	    linux_sa.sa_flags |= LINUX_SA_NOCLDSTOP;
+	if (bsd_sa.sa_flags & SA_ONSTACK)
+	    linux_sa.sa_flags |= LINUX_SA_ONSTACK;
+	if (bsd_sa.sa_flags & SA_RESTART)
+	    linux_sa.sa_flags |= LINUX_SA_RESTART;
+	if (error = copyout(&linux_sa, args->osa, sizeof(linux_sigaction_t)))
+	    return error;
+    }
+    return 0;
+}
+
+struct linux_sigprocmask_args {
+    int how;
+    linux_sigset_t *mask;
+    linux_sigset_t *omask;
+};
+
+int
+linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args,
+		  int *retval)
+{
+    int error, s;
+    sigset_t mask;
+    sigset_t omask;
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
+#endif
+    if (args->omask != NULL) {
+	omask = bsd_to_linux_sigmask(p->p_sigmask);
+	if (error = copyout(&omask, args->omask, sizeof(sigset_t)))
+	    return error;
+    }
+    if (!(args->mask))
+	return 0;
+    if (error = copyin(args->mask, &mask, sizeof(linux_sigset_t)))
+	return error;
+
+    mask = linux_to_bsd_sigmask(mask);
+    s = splhigh();
+    switch (args->how) {
+    case LINUX_SIG_BLOCK:
+	p->p_sigmask |= (mask & ~DONTMASK);
+	break;
+    case LINUX_SIG_UNBLOCK:
+	p->p_sigmask &= ~mask;
+	break;
+    case LINUX_SIG_SETMASK:
+	p->p_sigmask = (mask & ~DONTMASK);
+	break;
+    default:
+	error = EINVAL;
+	break;
+    }
+    splx(s);
+    return error;
+}
+
+int
+linux_siggetmask(struct proc *p, void *args, int *retval)
+{
+#ifdef DEBUG
+    printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
+#endif
+    *retval = bsd_to_linux_sigmask(p->p_sigmask);
+    return 0;
+}
+
+struct linux_sigsetmask_args {
+    linux_sigset_t mask;
+};
+
+int
+linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args,int *retval)
+{
+    int s;
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): sigsetmask(%08x)\n", p->p_pid, args->mask);
+#endif
+    s = splhigh();
+    p->p_sigmask = (linux_to_bsd_sigmask(args->mask) & ~DONTMASK);
+    splx(s);
+    *retval = bsd_to_linux_sigmask(p->p_sigmask);
+    return 0;
+}
+
+struct linux_sigpending_args {
+    linux_sigset_t *mask;
+};
+
+int
+linux_sigpending(struct proc *p, struct linux_sigpending_args *args,int *retval)
+{
+    linux_sigset_t linux_sig;
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
+#endif
+    linux_sig = bsd_to_linux_sigmask(p->p_siglist & p->p_sigmask);
+    return copyout(&linux_sig, args->mask, sizeof(linux_sig));
+}
+
+struct linux_sigsuspend_args {
+    linux_sigset_t mask;
+};
+
+int
+linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args,int *retval)
+{
+    sigset_t tmp;
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): sigsuspend(%08x)\n", p->p_pid, args->mask);
+#endif
+    tmp = linux_to_bsd_sigmask(args->mask);
+    return sigsuspend(p, &tmp , retval);
+}
+
+struct linux_kill_args {
+    int pid;
+    int signum;
+};
+
+int
+linux_kill(struct proc *p, struct linux_kill_args *args, int *retval)
+{
+    struct {
+	int pid;
+	int signum;
+    } tmp;
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): kill(%d, %d)\n", 
+	   p->p_pid, args->pid, args->signum);
+#endif
+    tmp.pid = args->pid;
+    tmp.signum = linux_to_bsd_signal[args->signum];
+    return kill(p, &tmp, retval);
+}