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.

5 files changed, 25 insertions, 11 deletions

diff --git a/sys/i386/conf/LINT b/sys/i386/conf/LINT
index ce1bae2..c2e6a38 100644
--- a/sys/i386/conf/LINT
+++ b/sys/i386/conf/LINT
@@ -2,7 +2,7 @@
 # LINT -- config file for checking all the sources, tries to pull in
 #	as much of the source tree as it can.
 #
-#	$Id: LINT,v 1.240 1996/02/23 15:47:41 phk Exp $
+#	$Id: LINT,v 1.241 1996/02/28 21:39:54 gpalmer Exp $
 #
 # NB: You probably don't want to try running a kernel built from this
 # file.  Instead, you should start from GENERIC, and add options from
@@ -846,7 +846,6 @@ options		POWERFAIL_NMI	# make it beep instead of panicing
 # More undocumented options for linting.
 
 options		APM_SLOWSTART=1
-options		COMPAT_LINUX
 options		DEBUG
 options		"EXT2FS"
 options		"IBCS2"
diff --git a/sys/i386/conf/Makefile.i386 b/sys/i386/conf/Makefile.i386
index f88dd84..3ba84a5 100644
--- a/sys/i386/conf/Makefile.i386
+++ b/sys/i386/conf/Makefile.i386
@@ -1,6 +1,6 @@
 # Copyright 1990 W. Jolitz
 #	from: @(#)Makefile.i386	7.1 5/10/91
-#	$Id: Makefile.i386,v 1.74 1996/01/07 22:31:27 phk Exp $
+#	$Id: Makefile.i386,v 1.75 1996/01/08 03:55:36 peter Exp $
 #
 # Makefile for FreeBSD
 #
@@ -136,7 +136,8 @@ genassym: genassym.o
 
 # XXX this assumes that the options for NORMAL_C* and DRIVER_C* are identical.
 depend: assym.s param.c vnode_if.h ${BEFORE_DEPEND}
-	mkdep ${COPTS} ${CFILES} ${SYSTEM_CFILES}
+	rm -f .depend
+	mkdep -a ${COPTS} ${CFILES} ${SYSTEM_CFILES}
 	mkdep -a ${COPTS} ${PARAM} -UKERNEL ${I386}/i386/genassym.c
 	MKDEP_CPP=${CPP} ; export MKDEP_CPP ; \
 	mkdep -a -DLOCORE ${COPTS} ${SFILES} ${SYSTEM_SFILES}
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES
index ce1bae2..c2e6a38 100644
--- a/sys/i386/conf/NOTES
+++ b/sys/i386/conf/NOTES
@@ -2,7 +2,7 @@
 # LINT -- config file for checking all the sources, tries to pull in
 #	as much of the source tree as it can.
 #
-#	$Id: LINT,v 1.240 1996/02/23 15:47:41 phk Exp $
+#	$Id: LINT,v 1.241 1996/02/28 21:39:54 gpalmer Exp $
 #
 # NB: You probably don't want to try running a kernel built from this
 # file.  Instead, you should start from GENERIC, and add options from
@@ -846,7 +846,6 @@ options		POWERFAIL_NMI	# make it beep instead of panicing
 # More undocumented options for linting.
 
 options		APM_SLOWSTART=1
-options		COMPAT_LINUX
 options		DEBUG
 options		"EXT2FS"
 options		"IBCS2"
diff --git a/sys/i386/conf/files.i386 b/sys/i386/conf/files.i386
index bef328a..5c0bef2 100644
--- a/sys/i386/conf/files.i386
+++ b/sys/i386/conf/files.i386
@@ -1,18 +1,32 @@
 # This file tells config what files go into building a kernel,
 # files marked standard are always included.
 #
-#	$Id: files.i386,v 1.128 1996/02/26 00:58:38 gibbs Exp $
+#	$Id: files.i386,v 1.129 1996/03/02 03:48:11 pst Exp $
 #
 aic7xxx_asm			optional	ahc	device-driver	   \
 	dependency 	"$S/dev/aic7xxx/aic7xxx_asm.c"			   \
 	compile-with	"${CC} -Wall -o $@ $>"				   \
 	no-obj no-implicit-rule						   \
 	clean		"aic7xxx_asm"
+#
 aic7xxx_seq.h			optional	ahc	device-driver	   \
 	compile-with	"./aic7xxx_asm -o $@ $S/dev/aic7xxx/aic7xxx.seq"   \
 	no-obj no-implicit-rule before-depend				   \
 	clean		"aic7xxx_seq.h"					   \
 	dependency	"$S/dev/aic7xxx/aic7xxx_reg.h $S/dev/aic7xxx/aic7xxx.seq aic7xxx_asm"
+#
+linux_genassym			optional	linux			   \
+	dependency 	"$S/i386/linux/linux_genassym.c $S/i386/linux/linux.h" \
+	compile-with	"${CC} ${CFLAGS} -o $@ $<"			   \
+	no-obj no-implicit-rule						   \
+	clean		"linux_genassym"
+#
+linux_assym.h			optional	linux			   \
+	dependency 	"linux_genassym"		   \
+	compile-with	"./linux_genassym > $@"				   \
+	no-obj no-implicit-rule before-depend				   \
+	clean		"linux_assym.h"
+#
 i386/scsi/93cx6.c		optional	ahc	device-driver
 i386/apm/apm.c			optional	apm	device-driver
 i386/apm/apm_setup.s		optional	apm
@@ -37,7 +51,6 @@ i386/i386/mem.c			standard
 i386/i386/microtime.s		standard
 i386/i386/ns_cksum.c		optional	ns
 i386/i386/pmap.c		standard
-# used by ptrace now
 i386/i386/procfs_machdep.c	standard
 i386/i386/support.s		standard
 i386/i386/swtch.s		standard
@@ -64,8 +77,6 @@ i386/ibcs2/ibcs2_errno.c	optional 	ibcs2
 i386/ibcs2/ibcs2_sysent.c	optional 	ibcs2
 i386/ibcs2/ibcs2_sysvec.c	optional 	ibcs2
 i386/ibcs2/imgact_coff.c	optional	ibcs2
-#i386/ibcs2/imgact_elf.c	optional	svr4
-#i386/ibcs2/imgact_xout.c	optional	ibcs2
 i386/isa/aha1542.c		optional	aha	device-driver
 i386/isa/aic6360.c              optional        aic     device-driver
 i386/isa/ata.c			optional	ata	device-driver
@@ -187,14 +198,16 @@ i386/isa/wt.c			optional	wt	device-driver
 i386/linux/imgact_linux.c	optional	linux
 i386/linux/linux_dummy.c	optional	linux
 i386/linux/linux_file.c		optional	linux
-i386/linux/linux_generic.c	optional	linux
 i386/linux/linux_ioctl.c	optional	linux
 i386/linux/linux_ipc.c		optional	linux
+i386/linux/linux_locore.s	optional	linux
 i386/linux/linux_misc.c		optional	linux
 i386/linux/linux_signal.c	optional	linux
 i386/linux/linux_socket.c	optional	linux
 i386/linux/linux_stats.c	optional	linux
 i386/linux/linux_sysent.c	optional	linux
+i386/linux/linux_sysvec.c	optional	linux
+i386/linux/linux_util.c		optional	linux
 i386/scsi/aic7xxx.c		optional	ahc	device-driver	   \
 	dependency	"$S/dev/aic7xxx/aic7xxx_reg.h aic7xxx_seq.h"
 i386/scsi/bt.c			optional	bt	device-driver
diff --git a/sys/i386/conf/options.i386 b/sys/i386/conf/options.i386
index b48ef2c..f30187d 100644
--- a/sys/i386/conf/options.i386
+++ b/sys/i386/conf/options.i386
@@ -8,3 +8,5 @@ SHOW_BUSYBUFS		opt_machdep.h
 PANIC_REBOOT_WAIT_TIME	opt_machdep.h
 LARGEMEM		opt_machdep.h
 MAXMEM			opt_machdep.h
+LINUX			opt_linux.h
+COMPAT_LINUX		opt_linux.h