Date: Wed, 22 Apr 1998 17:00:01 -0700 (PDT) From: Eivind Eklund <eivind@yes.no> To: freebsd-bugs 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: <199804230000.RAA07381@hub.freebsd.org>
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The following reply was made to PR kern/6389; it has been noted by GNATS.
From: Eivind Eklund <eivind@yes.no>
To: gilham@csl.sri.com, freebsd-gnats-submit@FreeBSD.ORG
Cc: msmith@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.
Date: Thu, 23 Apr 1998 01:56:22 +0200
I've gone through these changes and fixed style-problems; here are the
changes as diffs against today's current with hopefully OK stule.
This pass a LINT compile (I've not yet tested running with a new
kernel on my own machine; I'll do this in a few minutes).
Index: i386/i386/trap.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/i386/trap.c,v
retrieving revision 1.126
diff -u -r1.126 trap.c
--- trap.c 1998/04/15 17:45:07 1.126
+++ trap.c 1998/04/22 23:31:20
@@ -545,6 +545,9 @@
return;
}
+ if (*p->p_sysent->sv_transtrap)
+ i = (*p->p_sysent->sv_transtrap)(i, type);
+
trapsignal(p, i, ucode);
#ifdef DEBUG
Index: i386/ibcs2/ibcs2_sysvec.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/ibcs2/ibcs2_sysvec.c,v
retrieving revision 1.6
diff -u -r1.6 ibcs2_sysvec.c
--- ibcs2_sysvec.c 1997/02/22 09:33:28 1.6
+++ ibcs2_sysvec.c 1998/04/22 02:59:52
@@ -49,6 +49,7 @@
bsd_to_ibcs2_sig,
ELAST,
bsd_to_ibcs2_errno,
+ 0, /* Trap-to-signal translation function */
0, /* fixup */
sendsig,
sigcode, /* use generic trampoline */
Index: i386/linux/linux_sysvec.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/linux/linux_sysvec.c,v
retrieving revision 1.27
diff -u -r1.27 linux_sysvec.c
--- linux_sysvec.c 1998/04/13 17:49:51 1.27
+++ linux_sysvec.c 1998/04/22 23:21:09
@@ -98,6 +98,31 @@
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:
+ return SIGSEGV;
+
+ default:
+ return signal;
+ }
+
+ default:
+ return signal;
+ }
+}
+
+
static int
linux_fixup(int **stack_base, struct image_params *imgp)
{
@@ -374,6 +399,7 @@
bsd_to_linux_signal,
ELAST,
bsd_to_linux_errno,
+ translate_traps,
linux_fixup,
linux_sendsig,
linux_sigcode,
@@ -390,6 +416,7 @@
bsd_to_linux_signal,
ELAST,
bsd_to_linux_errno,
+ translate_traps,
elf_linux_fixup,
linux_sendsig,
linux_sigcode,
Index: kern/imgact_elf.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/imgact_elf.c,v
retrieving revision 1.23
diff -u -r1.23 imgact_elf.c
--- imgact_elf.c 1998/03/28 13:24:52 1.23
+++ imgact_elf.c 1998/04/22 23:22:31
@@ -78,6 +78,7 @@
0,
0,
0,
+ 0,
elf_freebsd_fixup,
sendsig,
sigcode,
Index: kern/init_sysvec.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/init_sysvec.c,v
retrieving revision 1.5
diff -u -r1.5 init_sysvec.c
--- init_sysvec.c 1997/08/02 14:31:26 1.5
+++ init_sysvec.c 1998/04/22 02:57:51
@@ -19,6 +19,7 @@
0,
0,
0,
+ 0,
sendsig,
sigcode,
&szsigcode,
Index: sys/sysent.h
===================================================================
RCS file: /home/ncvs/src/sys/sys/sysent.h,v
retrieving revision 1.16
diff -u -r1.16 sysent.h
--- sysent.h 1998/02/03 21:51:57 1.16
+++ sysent.h 1998/04/22 23:32:51
@@ -58,6 +58,8 @@
int *sv_sigtbl; /* signal translation table */
int sv_errsize; /* size of errno translation table */
int *sv_errtbl; /* errno translation table */
+ int (*sv_transtrap) __P((int, int));
+ /* translate trap-to-signal mapping */
int (*sv_fixup) __P((int **, struct image_params *));
/* stack fixup function */
void (*sv_sendsig) __P((void (*)(int), int, int, u_long));
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