nelhage / bemu

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A just-in-time compiler for MIT 6.004's "Beta" processor. — Read more

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Fix off-by-one displaying instruction profiles.

nelhage (author)

Tue Dec 08 21:52:14 -0800 2009

commit df6970d33a1331a7270d73e7608403d5dab308fb
tree e2dc90150f8d132f6f713801a9c6d65f296ae43c
parent 603b4b1c3186cfe3ea0126a4aea113ca5e571ba9

bemu /

name	age	history message
COPYING	Thu Jul 03 20:27:22 -0700 2008	Add COPYING and README [nelhage]
Makefile	Sat Nov 07 12:30:18 -0800 2009	Add the test binaries to the default target. [nelhage]
README	Mon Jan 19 21:12:46 -0800 2009	Update source link. [nelhage]
SConstruct	Tue Jul 01 20:47:40 -0700 2008	Default to -O2, since I'm now thinking about pe... [nelhage]
TODO	Wed Apr 15 22:09:36 -0700 2009	Remove two TODO items. [nelhage]
bclock.c	Fri Oct 03 14:28:05 -0700 2008	bclock.c: Use setitimer(2) in place of POSIX re... [nelhage]
bclock.h	Sun Jun 29 17:23:29 -0700 2008	Implement timer interrupts. Currently only supp... [nelhage]
bconsole.c	Tue Nov 10 20:34:08 -0800 2009	Call console_close using atexit(). This helps ... [nelhage]
bconsole.h	Thu Jul 03 19:42:28 -0700 2008	Compile with -Wall and fix all the warnings it ... [nelhage]
bcpu.c	Sun Nov 08 19:40:50 -0800 2009	Add support for profiling the executed program ... [nelhage]
bcpu.h	Sun Nov 08 19:40:50 -0800 2009	Add support for profiling the executed program ... [nelhage]
bdecode.c	Sun Jun 29 17:56:28 -0700 2008	Implement the WRCHAR() callout [nelhage]
bdecode.h	Sun Nov 08 19:40:50 -0800 2009	Add support for profiling the executed program ... [nelhage]
bemu.c	Tue Dec 08 21:52:14 -0800 2009	Fix off-by-one displaying instruction profiles. [nelhage]
bemu.h	Sun Nov 08 19:40:50 -0800 2009	Add support for profiling the executed program ... [nelhage]
bt.c	Mon Nov 09 18:24:10 -0800 2009	Clean up some comments slightly. [nelhage]
bt.h	Sat Nov 07 12:30:19 -0800 2009	Skip the (PC == %eax) check in most frags. Gen... [nelhage]
bt_helper.S	Sat Nov 07 12:30:19 -0800 2009	Skip the (PC == %eax) check in most frags. Gen... [nelhage]
insts.pl	Sun Jun 29 11:11:01 -0700 2008	insts.pl: Wrap codegen macros in braces for bet... [nelhage]
run-tests.sh	Sat Nov 07 12:30:18 -0800 2009	run-tests: Fix options for running 'timer' [nelhage]
tests/	Mon Nov 09 17:44:10 -0800 2009	Bubblesort test case. [nelhage]
uasm/	Fri Oct 03 20:06:04 -0700 2008	uasm.c: Use realloc() instead of mremap() [nelhage]
x86.h	Sun Nov 08 19:40:50 -0800 2009	Add support for profiling the executed program ... [nelhage]

README

This code implements a working Just-In-Time binary translator from the
Beta [1] processor to the i386. It supports clock and keyboard
interrupts, and correctly executes lab6.uasm, bench[1-4].uasm, and
litmus.uasm, as well as Lab 8's operating system [2].

This source is canonically available from github at
<http://github.com/nelhage/bemu/>.

It should work on just about any modern Linux or Intel OS X system,
although it's better tested on Linux. I've tested it on Athena and it
works fine there.

To run the self-tests, `make test'; To run the lab8 OS, `make
run-lab8'.

It alsos includes a somewhat hacked version of `uasm' from
http://web.mit.edu/6.004/src/posix-src/uasm/, modified to deal with
relative includes slightly better, and to support arbitrary-sized
ROMs.

[1] http://6004.csail.mit.edu/currentsemester/handouts/beta.pdf
[2] http://web.mit.edu/6.004/bsim/lab8.uasm

nelhage / bemu

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