Translate T_PROTFLT to SIGSEGV instead of SIGBUS when running under

Linux emulation.  This make Allegro Common Lisp 4.3 work under
FreeBSD!

Submitted by: Fred Gilham <gilham@csl.sri.com>
Commented on by: bde, dg, msmith, tg
Hoping he got everything right:  eivind

3 files changed, 33 insertions, 3 deletions

diff --git a/sys/i386/i386/trap.c b/sys/i386/i386/trap.c
index 7f0f801..3325d32 100644
--- a/sys/i386/i386/trap.c
+++ b/sys/i386/i386/trap.c
@@ -35,7 +35,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)trap.c	7.4 (Berkeley) 5/13/91
- *	$Id: trap.c,v 1.125 1998/03/30 09:48:27 phk Exp $
+ *	$Id: trap.c,v 1.126 1998/04/15 17:45:07 bde Exp $
  */
 
 /*
@@ -545,6 +545,10 @@ kernel_trap:
 		return;
 	}
 
+	/* Translate fault for emulators (e.g. Linux) */
+	if (*p->p_sysent->sv_transtrap)
+		i = (*p->p_sysent->sv_transtrap)(i, type);
+
 	trapsignal(p, i, ucode);
 
 #ifdef DEBUG
diff --git a/sys/i386/ibcs2/ibcs2_sysvec.c b/sys/i386/ibcs2/ibcs2_sysvec.c
index b7ecbca..7eefe14 100644
--- a/sys/i386/ibcs2/ibcs2_sysvec.c
+++ b/sys/i386/ibcs2/ibcs2_sysvec.c
@@ -27,7 +27,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * $Id$
+ * $Id: ibcs2_sysvec.c,v 1.6 1997/02/22 09:33:28 peter Exp $
  */
 
 #include <sys/param.h>
@@ -49,6 +49,7 @@ struct sysentvec ibcs2_svr3_sysvec = {
         bsd_to_ibcs2_sig,
         ELAST,
         bsd_to_ibcs2_errno,
+	0,              /* trap-to-signal translation function */
 	0,		/* fixup */
 	sendsig,
 	sigcode,	/* use generic trampoline */
diff --git a/sys/i386/linux/linux_sysvec.c b/sys/i386/linux/linux_sysvec.c
index 134ff9e..a7da306 100644
--- a/sys/i386/linux/linux_sysvec.c
+++ b/sys/i386/linux/linux_sysvec.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_sysvec.c,v 1.26 1998/02/13 07:34:52 bde Exp $
+ *  $Id: linux_sysvec.c,v 1.27 1998/04/13 17:49:51 sos Exp $
  */
 
 /* XXX we use functions that might not exist. */
@@ -98,6 +98,29 @@ int linux_to_bsd_signal[LINUX_NSIG] = {
 	SIGXCPU, SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, SIGURG, SIGURG, 0
 };
 
+/*
+ * If FreeBSD & Linux have a difference of opinion about what a trap
+ * means, deal with it here.
+ */
+static int
+translate_traps(int signal, int trap_code)
+{
+	switch(signal) {
+	case SIGBUS:
+		switch(trap_code) {
+		case T_PROTFLT:
+        case T_TSSFLT:
+        case T_DOUBLEFLT:
+        case T_PAGEFLT:
+			return SIGSEGV;
+		default:
+			return signal;
+		}
+	default:
+		return signal;
+	}
+}
+
 static int
 linux_fixup(int **stack_base, struct image_params *imgp)
 {
@@ -374,6 +397,7 @@ struct sysentvec linux_sysvec = {
 	bsd_to_linux_signal,
 	ELAST, 
 	bsd_to_linux_errno,
+	translate_traps,
 	linux_fixup,
 	linux_sendsig,
 	linux_sigcode,	
@@ -390,6 +414,7 @@ struct sysentvec elf_linux_sysvec = {
         bsd_to_linux_signal,
         ELAST,
         bsd_to_linux_errno,
+        translate_traps,
         elf_linux_fixup,
         linux_sendsig,
         linux_sigcode,