/[gxemul]/upstream/0.3.5/man/gxemul.1
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trunk/man/gxemul.1 revision 6 by dpavlin, Mon Oct 8 16:18:11 2007 UTC upstream/0.3.5/man/gxemul.1 revision 13 by dpavlin, Mon Oct 8 16:18:43 2007 UTC
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1  .\" $Id: gxemul.1,v 1.21 2005/06/03 23:14:52 debug Exp $  .\" $Id: gxemul.1,v 1.29 2005/08/10 15:51:09 debug Exp $
2  .\"  .\"
3  .\" Copyright (C) 2004-2005  Anders Gavare.  All rights reserved.  .\" Copyright (C) 2004-2005  Anders Gavare.  All rights reserved.
4  .\"  .\"
# Line 29  Line 29 
29  .\" This is a minimal man page for GXemul. Process this file with  .\" This is a minimal man page for GXemul. Process this file with
30  .\"     groff -man -Tascii gxemul.1    or    nroff -man gxemul.1  .\"     groff -man -Tascii gxemul.1    or    nroff -man gxemul.1
31  .\"  .\"
32  .Dd JUNE 2005  .Dd AUGUST 2005
33  .Dt GXEMUL 1  .Dt GXEMUL 1
34  .Os  .Os
35  .Sh NAME  .Sh NAME
# Line 47  Line 47 
47  .Ar file Op Ar args ...  .Ar file Op Ar args ...
48  .Sh DESCRIPTION  .Sh DESCRIPTION
49  .Nm  .Nm
50  is an experimental instruction-level machine emulator. It can be used  is an experimental instruction-level machine emulator. It can be used to
51  to run binary code for (among others) MIPS-based machines.  run binary code for MIPS-based machines, regardless of host
52  Several emulation modes are available. For some emulation modes, processors  platform. Several emulation modes are available. For some modes,
53  and surrounding hardware components are emulated well enough to let  processors and surrounding hardware components are emulated well enough to
54  unmodified operating systems (eg. NetBSD) run as if they were running on a  let unmodified operating systems (e.g. NetBSD) run as if they were running
55  real machine.  on a real machine.
56    .Pp
57    (Non-MIPS emulation modes are also under development, but so far none of
58    those modes has reached the completeness required to run unmodified
59    operating systems.)
60  .Pp  .Pp
61  There are three ways to invoke the emulator. When emulating a  There are three ways to invoke the emulator. When emulating a
62  complete machine, settings can be entered directly on the command line, or  complete machine, settings can be entered directly on the command line, or
# Line 97  Machine selection options: Line 101  Machine selection options:
101  .It Fl E Ar t  .It Fl E Ar t
102  Try to emulate machine type  Try to emulate machine type
103  .Ar "t".  .Ar "t".
104    This option is not always needed, if the
105    .Fl e
106    option uniquely selects a machine.
107  (Use  (Use
108  .Fl H  .Fl H
109  to get a list of types.)  to get a list of types.)
# Line 110  Use this together with Line 117  Use this together with
117  .Pp  .Pp
118  Other options:  Other options:
119  .Bl -tag -width Ds  .Bl -tag -width Ds
120    .It Fl A
121    Disable load/store alignment checks in some cases. This might give a small
122    increase in performance, but the emulator will not run correctly if the
123    emulated code actually tries to do unaligned loads or stores.
124  .It Fl B  .It Fl B
125  Disable dynamic binary translation completely. By default, bintrans  Disable dynamic binary translation. By default, bintrans
126  will be turned on if the host architecture supports it.  will be turned on if the host+target architecture combination is
127  However, in this release (0.3.X), there is no new bintrans system.  supported.
 If you want to enable binary translation, use  
 .Fl "b".  
 .It Fl b  
 Use the OLD binary translation subsystem. (Alpha and i386 hosts only.)  
128  .It Fl C Ar x  .It Fl C Ar x
129  Try to emulate a specific CPU type,  Try to emulate a specific CPU type,
130  .Ar "x".  .Ar "x".
# Line 180  Disable some speed tricks. Line 187  Disable some speed tricks.
187  .It Fl j Ar n  .It Fl j Ar n
188  Set the name of the kernel to  Set the name of the kernel to
189  .Ar "n".  .Ar "n".
190  When booting from an ISO9660 filesystem, the kernel will try to boot from  When booting from an ISO9660 filesystem, the emulator will try to boot
191  this file. (In some emulation modes, eg. DECstation, this name is passed  using this file. (In some emulation modes, eg. DECstation, this name is passed
192  along to the boot program. Useful names are "bsd" for OpenBSD/pmax,  along to the boot program. Useful names are "bsd" for OpenBSD/pmax,
193  or "vmunix" for Ultrix.)  or "vmunix" for Ultrix.)
194  .It Fl M Ar m  .It Fl M Ar m
# Line 302  subdirectory of the Line 309  subdirectory of the
309  distribution.  distribution.
310  .Sh EXAMPLES  .Sh EXAMPLES
311  The following command will start NetBSD/pmax on an emulated DECstation  The following command will start NetBSD/pmax on an emulated DECstation
312  5000/200 (3MAX), with the old bintrans system enabled:  5000/200 (3MAX):
313  .Pp  .Pp
314  .Dl "gxemul -E dec -e 3max -b -d netbsddisk.img"  .Dl "gxemul -e 3max -d nbsd_pmax.img"
315  .Pp  .Pp
316  netbsddisk.img should be a raw disk image containing a bootable  nbsd_pmax.img should be a raw disk image containing a bootable
317  NetBSD/pmax filesystem.  NetBSD/pmax filesystem.
318  .Pp  .Pp
319  The following command will start an emulation session based on settings in  The following command will start an emulation session based on settings in
# Line 330  Please read the documentation for more d Line 337  Please read the documentation for more d
337  There are many bugs. Some of the known bugs are listed in the BUGS  There are many bugs. Some of the known bugs are listed in the BUGS
338  file in the  file in the
339  .Nm  .Nm
340  source distribution, some are indirectly mentioned in the TODO file.  source distribution, some are indirectly mentioned in the TODO file,
341    and some are mentioned in the source code itself.
342  .Pp  .Pp
343  There is no new bintrans system in this release, so you will need to add  The binary translation subsystem is really terrible, but it is less
344  .Fl b  terrible than running without it.
345  to select the old bintrans system, if you want speed.  .Pp
346    Userland (syscall-only) emulation doesn't really work yet.
347  .Pp  .Pp
348  .Nm  .Nm
349  does not simulate individual pipe-line stages or penalties caused by  does not simulate individual pipe-line stages or penalties caused by
350  branch-prediction misses, so it cannot be used for accurate performance  branch-prediction misses or cache misses, so it cannot be used for
351  measurement.  accurate performance measurement.
352  .Pp  .Pp
353  .Nm  .Nm
354  is not timing-accurate.  is not timing-accurate.
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