Mega-commit for Linux emulator update.. This has been stress tested under

netscape-2.0 for Linux running all the Java stuff.  The scrollbars are now
working, at least on my machine. (whew! :-)

I'm uncomfortable with the size of this commit, but it's too
inter-dependant to easily seperate out.

The main changes:

COMPAT_LINUX is *GONE*.  Most of the code has been moved out of the i386
machine dependent section into the linux emulator itself.  The int 0x80
syscall code was almost identical to the lcall 7,0 code and a minor tweak
allows them to both be used with the same C code.  All kernels can now
just modload the lkm and it'll DTRT without having to rebuild the kernel
first.  Like IBCS2, you can statically compile it in with "options LINUX".

A pile of new syscalls implemented, including getdents(), llseek(),
readv(), writev(), msync(), personality().  The Linux-ELF libraries want
to use some of these.

linux_select() now obeys Linux semantics, ie: returns the time remaining
of the timeout value rather than leaving it the original value.

Quite a few bugs removed, including incorrect arguments being used in
syscalls..  eg:  mixups between passing the sigset as an int, vs passing
it as a pointer and doing a copyin(), missing return values, unhandled
cases, SIOC* ioctls, etc.

The build for the code has changed.  i386/conf/files now knows how
to build linux_genassym and generate linux_assym.h on the fly.

Supporting changes elsewhere in the kernel:

The user-mode signal trampoline has moved from the U area to immediately
below the top of the stack (below PS_STRINGS).  This allows the different
binary emulations to have their own signal trampoline code (which gets rid
of the hardwired syscall 103 (sigreturn on BSD, syslog on Linux)) and so
that the emulator can provide the exact "struct sigcontext *" argument to
the program's signal handlers.

The sigstack's "ss_flags" now uses SS_DISABLE and SS_ONSTACK flags, which
have the same values as the re-used SA_DISABLE and SA_ONSTACK which are
intended for sigaction only.  This enables the support of a SA_RESETHAND
flag to sigaction to implement the gross SYSV and Linux SA_ONESHOT signal
semantics where the signal handler is reset when it's triggered.

makesyscalls.sh no longer appends the struct sysentvec on the end of the
generated init_sysent.c code.  It's a lot saner to have it in a seperate
file rather than trying to update the structure inside the awk script. :-)

At exec time, the dozen bytes or so of signal trampoline code are copied
to the top of the user's stack, rather than obtaining the trampoline code
the old way by getting a clone of the parent's user area.  This allows
Linux and native binaries to freely exec each other without getting
trampolines mixed up.

1 files changed, 130 insertions, 80 deletions

diff --git a/sys/i386/linux/linux_signal.c b/sys/i386/linux/linux_signal.c
index fc5c2cd..32648cb 100644
--- a/sys/i386/linux/linux_signal.c
+++ b/sys/i386/linux/linux_signal.c
@@ -25,7 +25,7 @@
  * (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 1995/11/22 07:43:50 bde Exp $
+ *  $Id: linux_signal.c,v 1.3 1995/12/15 03:06:56 peter Exp $
  */
 
 #include <sys/param.h>
@@ -37,69 +37,96 @@
 #include <sys/signalvar.h>
 
 #include <i386/linux/linux.h>
-#include <i386/linux/sysproto.h>
-
-#define DONTMASK    (sigmask(SIGKILL)|sigmask(SIGSTOP)|sigmask(SIGCHLD))
+#include <i386/linux/linux_proto.h>
+#include <i386/linux/linux_util.h>
 
 static sigset_t
-linux_to_bsd_sigmask(linux_sigset_t mask) {
-    int i;
+linux_to_bsd_sigset(linux_sigset_t mask) {
+    int b, l;
     sigset_t new = 0;
 
-    for (i = 1; i <= LINUX_NSIG; i++)
-	if (mask & (1 << i-1))
-	    new |= (1 << (linux_to_bsd_signal[i]-1));
+    for (l = 1; l <= LINUX_NSIG; l++) {
+	if (mask & (1 << (l - 1))) {
+	    if ((b = linux_to_bsd_signal[l]))
+		new |= (1 << (b - 1));
+	}
+    }
     return new;
 }
 
 static linux_sigset_t
-bsd_to_linux_sigmask(sigset_t mask) {
-    int i;
+bsd_to_linux_sigset(sigset_t mask) {
+    int b, l;
     sigset_t new = 0;
 
-    for (i = 1; i <= NSIG; i++)
-	if (mask & (1 << i-1))
-	    new |= (1 << (bsd_to_linux_signal[i]-1));
+    for (b = 1; b <= NSIG; b++) {
+	if (mask & (1 << (b - 1))) {
+	    if ((l = bsd_to_linux_signal[b]))
+		new |= (1 << (l - 1));
+	}
+    }
     return new;
 }
 
-struct linux_sigaction_args {
-    int sig;
-    linux_sigaction_t *nsa;
-    linux_sigaction_t *osa;
-};
+void
+linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
+{
+    bsa->sa_mask = linux_to_bsd_sigset(lsa->sa_mask);
+    bsa->sa_handler = lsa->sa_handler;
+    bsa->sa_flags = 0;
+    if (lsa->sa_flags & LINUX_SA_NOCLDSTOP)
+	bsa->sa_flags |= SA_NOCLDSTOP;
+    if (lsa->sa_flags & LINUX_SA_ONSTACK)
+	bsa->sa_flags |= SA_ONSTACK;
+    if (lsa->sa_flags & LINUX_SA_RESTART)
+	bsa->sa_flags |= SA_RESTART;
+    if (lsa->sa_flags & LINUX_SA_ONESHOT)
+	bsa->sa_flags |= SA_RESETHAND;
+    if (lsa->sa_flags & LINUX_SA_NOMASK)
+	bsa->sa_flags |= SA_NODEFER;
+}
+
+void
+bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
+{
+    lsa->sa_handler = bsa->sa_handler;
+    lsa->sa_restorer = NULL;	/* unsupported */
+    lsa->sa_mask = bsd_to_linux_sigset(bsa->sa_mask);
+    lsa->sa_flags = 0;
+    if (bsa->sa_flags & SA_NOCLDSTOP)
+	lsa->sa_flags |= LINUX_SA_NOCLDSTOP;
+    if (bsa->sa_flags & SA_ONSTACK)
+	lsa->sa_flags |= LINUX_SA_ONSTACK;
+    if (bsa->sa_flags & SA_RESTART)
+	lsa->sa_flags |= LINUX_SA_RESTART;
+    if (bsa->sa_flags & SA_RESETHAND)
+	lsa->sa_flags |= LINUX_SA_ONESHOT;
+    if (bsa->sa_flags & SA_NODEFER)
+	lsa->sa_flags |= LINUX_SA_NOMASK;
+}
 
 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 signum;
-	struct sigaction *nsa;
-	struct sigaction *osa;
-    } */ sa;
+    struct sigaction_args sa;
     int error;
+    caddr_t sg = stackgap_init();
     
 #ifdef DEBUG
-    printf("Linux-emul(%d): sigaction(%d, *, *)\n", p->p_pid, args->sig);
+    printf("Linux-emul(%d): sigaction(%d, %08x, %08x)\n", p->p_pid, args->sig,
+	args->nsa, args->osa);
 #endif
+
     if (args->osa)
-	osa = (struct sigaction *)ua_alloc_init(sizeof(struct sigaction));
+	osa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
 
     if (args->nsa) {
-	nsa = (struct sigaction *)ua_alloc(sizeof(struct sigaction));
+	nsa = (struct sigaction *)stackgap_alloc(&sg, 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;
+	linux_to_bsd_sigaction(&linux_sa, &bsd_sa);
 	if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction)))
 	    return error;
     }
@@ -112,27 +139,49 @@ linux_sigaction(struct proc *p, struct linux_sigaction_args *args, int *retval)
     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;
+	bsd_to_linux_sigaction(&bsd_sa, &linux_sa);
 	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_signal(struct proc *p, struct linux_signal_args *args, int *retval)
+{
+    caddr_t sg;
+    struct sigaction_args sa_args;
+    struct sigaction *osa, *nsa, tmpsa;
+    int error;
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): signal(%d, %08x)\n", p->p_pid,
+	    args->sig, args->handler);
+#endif
+    sg = stackgap_init();
+    nsa = stackgap_alloc(&sg, sizeof *nsa);
+    osa = stackgap_alloc(&sg, sizeof *osa);
+
+    tmpsa.sa_handler = args->handler;
+    tmpsa.sa_mask = (sigset_t) 0;
+    tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER;
+    if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
+	return error;
+
+    sa_args.signum = linux_to_bsd_signal[args->sig];
+    sa_args.osa = osa;
+    sa_args.nsa = nsa;
+    if ((error = sigaction(p, &sa_args, retval)))
+	return error;
+
+    if ((error = copyin(osa, &tmpsa, sizeof *osa)))
+	return error;
+
+    *retval = (int)tmpsa.sa_handler;
+
+    return 0;
+}
+
 
 int
 linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args,
@@ -145,8 +194,11 @@ linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args,
 #ifdef DEBUG
     printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
 #endif
+
+    *retval = 0;
+
     if (args->omask != NULL) {
-	omask = bsd_to_linux_sigmask(p->p_sigmask);
+	omask = bsd_to_linux_sigset(p->p_sigmask);
 	if (error = copyout(&omask, args->omask, sizeof(sigset_t)))
 	    return error;
     }
@@ -155,17 +207,17 @@ linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args,
     if (error = copyin(args->mask, &mask, sizeof(linux_sigset_t)))
 	return error;
 
-    mask = linux_to_bsd_sigmask(mask);
+    mask = linux_to_bsd_sigset(mask);
     s = splhigh();
     switch (args->how) {
     case LINUX_SIG_BLOCK:
-	p->p_sigmask |= (mask & ~DONTMASK);
+	p->p_sigmask |= (mask & ~sigcantmask);
 	break;
     case LINUX_SIG_UNBLOCK:
 	p->p_sigmask &= ~mask;
 	break;
     case LINUX_SIG_SETMASK:
-	p->p_sigmask = (mask & ~DONTMASK);
+	p->p_sigmask = (mask & ~sigcantmask);
 	break;
     default:
 	error = EINVAL;
@@ -176,38 +228,33 @@ linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args,
 }
 
 int
-linux_siggetmask(struct proc *p, void *args, int *retval)
+linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args, int *retval)
 {
 #ifdef DEBUG
     printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
 #endif
-    *retval = bsd_to_linux_sigmask(p->p_sigmask);
+    *retval = bsd_to_linux_sigset(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;
+    sigset_t mask;
 
 #ifdef DEBUG
     printf("Linux-emul(%d): sigsetmask(%08x)\n", p->p_pid, args->mask);
 #endif
+    *retval = bsd_to_linux_sigset(p->p_sigmask);
+
+    mask = linux_to_bsd_sigset(args->mask);
     s = splhigh();
-    p->p_sigmask = (linux_to_bsd_sigmask(args->mask) & ~DONTMASK);
+    p->p_sigmask = mask & ~sigcantmask;
     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)
 {
@@ -216,32 +263,35 @@ linux_sigpending(struct proc *p, struct linux_sigpending_args *args,int *retval)
 #ifdef DEBUG
     printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
 #endif
-    linux_sig = bsd_to_linux_sigmask(p->p_siglist & p->p_sigmask);
+    linux_sig = bsd_to_linux_sigset(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)
 {
-    struct sigsuspend_args /* {
-	int mask;
-    } */ tmp;
+    struct sigsuspend_args tmp;
+    int error;
 
 #ifdef DEBUG
     printf("Linux-emul(%d): sigsuspend(%08x)\n", p->p_pid, args->mask);
 #endif
-    tmp.mask = linux_to_bsd_sigmask(args->mask);
+    tmp.mask = linux_to_bsd_sigset(args->mask);
     return sigsuspend(p, &tmp , retval);
 }
 
-struct linux_kill_args {
-    int pid;
-    int signum;
-};
+int
+linux_pause(struct proc *p, struct linux_pause_args *args,int *retval)
+{
+    struct sigsuspend_args tmp;
+    int error;
+
+#ifdef DEBUG
+    printf("Linux-emul(%d): pause()\n", p->p_pid);
+#endif
+    tmp.mask = p->p_sigmask;
+    return sigsuspend(p, &tmp , retval);
+}
 
 int
 linux_kill(struct proc *p, struct linux_kill_args *args, int *retval)