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.\" $Id: gxemul.1,v 1.29 2005/08/10 15:51:09 debug Exp $ |
.\" $Id: gxemul.1,v 1.33 2005/10/07 22:45:34 debug Exp $ |
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.\" |
.\" |
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.\" Copyright (C) 2004-2005 Anders Gavare. All rights reserved. |
.\" Copyright (C) 2004-2005 Anders Gavare. All rights reserved. |
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.\" |
.\" |
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.\" This is a minimal man page for GXemul. Process this file with |
.\" This is a minimal man page for GXemul. Process this file with |
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.\" groff -man -Tascii gxemul.1 or nroff -man gxemul.1 |
.\" groff -man -Tascii gxemul.1 or nroff -man gxemul.1 |
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.\" |
.\" |
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.Dd AUGUST 2005 |
.Dd OCTOBER 2005 |
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.Dt GXEMUL 1 |
.Dt GXEMUL 1 |
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.Os |
.Os |
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.Sh NAME |
.Sh NAME |
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.Op file Ar ... |
.Op file Ar ... |
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.Nm |
.Nm |
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.Op general options |
.Op general options |
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.Op Ar @configfile ... |
.Ar @configfile |
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.Nm |
.Nm |
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.Op userland, other, and general options |
.Op userland, other, and general options |
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.Ar file Op Ar args ... |
.Ar file Op Ar args ... |
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.Sh DESCRIPTION |
.Sh DESCRIPTION |
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.Nm |
.Nm |
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is an experimental instruction-level machine emulator. It can be used to |
is an experimental instruction-level machine emulator. Several |
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run binary code for MIPS-based machines, regardless of host |
emulation modes are available. In some modes, processors and surrounding |
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platform. Several emulation modes are available. For some modes, |
hardware components are emulated well enough to let unmodified operating |
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processors and surrounding hardware components are emulated well enough to |
systems (e.g. NetBSD) run as if they were running on a real machine. |
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let unmodified operating systems (e.g. NetBSD) run as if they were running |
.Pp |
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on a real machine. |
The processor architecture best emulated by GXemul is MIPS, but other |
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.Pp |
architectures are also partially emulated. |
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(Non-MIPS emulation modes are also under development, but so far none of |
.Pp |
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those modes has reached the completeness required to run unmodified |
There are three ways to invoke the emulator: |
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operating systems.) |
.Pp |
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.Pp |
1. When emulating a complete machine, configuration options can be entered |
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There are three ways to invoke the emulator. When emulating a |
directly on the command line. |
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complete machine, settings can be entered directly on the command line, or |
.Pp |
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they can be read from a configuration file. When emulating a userland |
2. Options can be read from a configuration file. |
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environment (syscall-only emulation, not emulating complete machines), |
.Pp |
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then the program name and its argument should be given on the command |
3. When emulating a userland environment (syscall-only emulation, not |
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line. |
emulating complete machines), then the program name and its argument |
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|
should be given on the command line. (This mode doesn't really work yet.) |
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.Pp |
.Pp |
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The easiest way to use the emulator is to supply settings directly on the |
The easiest way to use the emulator is to supply settings directly on the |
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command line. The most important thing you need to supply is the |
command line. The most important thing you need to supply is the |
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file argument. This is the name of a binary file (an ELF, a.out, ECOFF, |
file argument. This is the name of a binary file (an ELF, a.out, COFF/ECOFF, |
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SREC, or a raw binary image) which you wish to run in the emulator. This file |
SREC, or a raw binary image) which you wish to run in the emulator. This file |
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might be an operating system kernel, or perhaps a ROM image file. |
might be an operating system kernel, or perhaps a ROM image file. |
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.Pp |
.Pp |
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Force a specific ID number. |
Force a specific ID number. |
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.El |
.El |
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.Pp |
.Pp |
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Unless otherwise specified, filenames ending with ".iso" are assumed to be |
Unless otherwise specified, filenames ending with ".iso" or ".cdr" are |
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CDROM images. Most others are assumed to be disks. Depending on which |
assumed to be CDROM images. Most others are assumed to be disks. Depending |
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machine is being emulated, the default for disks can be either SCSI or |
on which machine is being emulated, the default for disks can be either |
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IDE. Some disk images that are very small are assumed to be floppy disks. |
SCSI or IDE. Some disk images that are very small are assumed to be floppy |
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(If you are not happy with the way a disk image is detected, then you need |
disks. (If you are not happy with the way a disk image is detected, then |
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to use explicit prefixes to force a specific type.) |
you need to use explicit prefixes to force a specific type.) |
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.Pp |
.Pp |
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For floppies, the gH;S; prefix is ignored. Instead, the number of |
For floppies, the gH;S; prefix is ignored. Instead, the number of |
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heads and cylinders are assumed to be 2 and 80, respectively, and the |
heads and cylinders are assumed to be 2 and 80, respectively, and the |
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.Pp |
.Pp |
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.Nm |
.Nm |
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does not simulate individual pipe-line stages or penalties caused by |
does not simulate individual pipe-line stages or penalties caused by |
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branch-prediction misses or cache misses, so it cannot be used for |
branch-prediction misses or cache misses, so it cannot be used for |
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accurate performance measurement. |
accurate simulation of any actual real-world processor. |
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.Pp |
.Pp |
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.Nm |
.Nm |
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is not timing-accurate. |
is not timing-accurate. |