From owner-freebsd-bugs  Thu Apr 23 23:19:36 1998
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To: Mike Smith <mike@smith.net.au>
Cc: freebsd-bugs@hub.freebsd.org
Subject: Re: kern/6389: Need to be able to access trap-to-signal mapping to for  Linux emulation to allow Allegro Common Lisp (and maybe other apps) to run.
References: <199804231920.MAA09253@hub.freebsd.org>
From: Thomas Gellekum <tg@ihf.rwth-aachen.de>
Date: 24 Apr 1998 08:19:12 +0200
In-Reply-To: Mike Smith's message of "Thu, 23 Apr 1998 12:20:01 -0700 (PDT)"
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Mike Smith <mike@smith.net.au> writes:

>  > Index: i386/linux/linux_sysvec.c
>  > ===================================================================
>  > RCS file: /home/ncvs/src/sys/i386/linux/linux_sysvec.c,v
>  > retrieving revision 1.27

Apart from minor formatting changes, my version of linux_sysvec.c
looks like this (relative to 2.2.6-STABLE):

Index: i386/linux/linux_sysvec.c
===================================================================
RCS file: /usr/local/cvs/src/sys/i386/linux/linux_sysvec.c,v
retrieving revision 1.9
diff -u -r1.9 linux_sysvec.c
--- linux_sysvec.c	1996/10/16 17:51:07	1.9
+++ linux_sysvec.c	1998/04/23 18:07:45
@@ -103,6 +103,32 @@
 	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;
+			break;
+		default:
+			return signal;
+			break;
+		}
+	default:
+		return signal;
+		break;
+	}
+}
+
 int linux_fixup(int **stack_base, struct image_params *imgp)
 {
 	int *argv, *envp;
@@ -378,6 +404,7 @@
 	bsd_to_linux_signal,
 	ELAST, 
 	bsd_to_linux_errno,
+	translate_traps,
 	linux_fixup,
 	linux_sendsig,
 	linux_sigcode,	
@@ -394,6 +421,7 @@
         bsd_to_linux_signal,
         ELAST,
         bsd_to_linux_errno,
+	translate_traps,
         elf_linux_fixup,
         linux_sendsig,
         linux_sigcode,

I needed the `case T_PAGEFLT:' to get spicecad to run. The other traps
come from my (limited) understanding of Linux' trap.c and handling
them may or may not be of practical use.

tg

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