Date: 24 Apr 1998 08:19:12 +0200 From: Thomas Gellekum <tg@ihf.rwth-aachen.de> 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. Message-ID: <8767jzvj1b.fsf@ghpc6.ihf.rwth-aachen.de> In-Reply-To: Mike Smith's message of "Thu, 23 Apr 1998 12:20:01 -0700 (PDT)" References: <199804231920.MAA09253@hub.freebsd.org>
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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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