Phil Budne
9e148edefc
changes in expression parsing
2016-02-28 16:29:01 -05:00
Warren Toomey
ed80a93a08
tools/a7out: I added another 7 instructions, but I haven't tested them yet.
2016-02-27 21:55:12 +10:00
Warren Toomey
ea7cd8da28
tools/a7out: Added the jms instruction.
2016-02-27 15:55:40 +10:00
Warren Toomey
ea11773db7
tools/a7out: Add the law instruction and change some numeric literals to
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named constants.
2016-02-27 15:24:01 +10:00
Warren Toomey
4ee2619b8c
I refactored tools/wktcat.s to lose the repeated code, and I also
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improved the comments in the code. I'm happy with it, now.
2016-02-27 11:12:16 +10:00
Warren Toomey
fafeae7470
I've rewritten tools/a7out to have the correct PDP-7 Unix command
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line memory storage convention, and I've rewritten tools/wktcat.s
to deal with this. I've imported some code from the real cat.s
and now wktcat.s actually works as per the real cat.s.
2016-02-27 10:49:43 +10:00
Warren Toomey
d2511c36c0
I'm trying to bring my wktcat.s file into line with the real one.
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I've refactored tools/a7out to have a dprintf() function to printf
only on debugging. I still need to rewrite the command-line arg
storage structure.
2016-02-27 08:05:52 +10:00
Warren Toomey
d6d4c9b814
According to cat.s, fd 8 is standard error (not fd2!). I've updated
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the a7out simulator to have STDERR on fd 8.
2016-02-26 22:37:03 +10:00
Warren Toomey
9c8dbdea37
tools/a7out: I refactored the indirect logic, much nicer now.
2016-02-26 21:57:10 +10:00
Warren Toomey
a132327a8b
a7out: I had the spa logic wrong. Now fixed.
2016-02-26 21:45:55 +10:00
Warren Toomey
6534bd6d43
I renamed simplecat.s to wktcat.s
2016-02-26 21:28:22 +10:00
Warren Toomey
536de9ea56
I worked out the bug with the command-line arguments, I was overwriting
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017777, oops. I've added more comments to wktcat.s (renamed from
simplecat.s). Now we need to find out how the real PDP-7 Unix
does command line arguments.
2016-02-26 21:26:44 +10:00
Warren Toomey
8f8cc64d10
I've added tad and sza to the a7out simulator, and I also added some
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code to place command-line arguments into the simulated memory. I'm
trying to write my own version of cat so I can compare mine to the
real one. Right now there's a bug when simplecat has two arguments.
Zero and one arguments are OK! Saving so I have a backup before proceeding.
2016-02-26 20:56:31 +10:00
Warren Toomey
b8550475b0
I've got a very simple cat program working, which reads from stdin and
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sends it to stdout.
2016-02-26 18:43:20 +10:00
Phil Budne
815d8bc220
comment out debug prints
2016-02-25 21:03:39 -05:00
Phil Budne
2cca3d4473
finish s1.s; tried to clean up s5-s8; let as7 continue after error
2016-02-25 20:58:17 -05:00
Warren Toomey
c84b2dffdd
I've changed the assembler so that it groks the <ab> string literal
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syntax. I think it's OK, but it probably needs more testing.
write_test.s was changed to exercise the string parsing.
2016-02-26 07:35:36 +10:00
Warren Toomey
018af6f43e
Ken Thompson sent e-mail in to explain that there can be labels mid-line, such as
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sys write; 1:0; 4
so I modified the assembler logic to support this, and added some code to write_test.s
to verify that it works.
2016-02-26 06:52:43 +10:00
Warren Toomey
f9b8c8eeb2
Changed as7 to allow sys open statements, rewrite write_test.s to
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use this syntax, and fixed up a bug in sys_open in a7out.
2016-02-26 06:19:27 +10:00
Warren Toomey
4b9f851a84
Explain how to assemble and run the program.
2016-02-25 18:50:00 +10:00
Warren Toomey
45fb97e051
An assembly program to test the a7out user-mode simulator.
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Expext its contents to change often as a7out is written.
2016-02-25 18:47:17 +10:00
Warren Toomey
cc678483e1
I've added read() now, but I haven't tested it fully yet.
2016-02-25 18:43:44 +10:00
Warren Toomey
b463500f37
I've got a few system calls working: open, close, write, exit along with the
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instructions dac, lac, iot and hlt. I can print Hello, world\n, yay!
2016-02-25 18:12:57 +10:00
Warren Toomey
f5554d1181
The beginnings of the user-mode simulator: three instructions so far
2016-02-25 10:25:43 +10:00
Warren Toomey
07c95bbe15
I commented out most of the debug lines, and I now output the octal code
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along with the input line that generated it. There is code to use values
of defined constants as well as defined labels.
2016-02-24 13:25:24 +10:00
Warren Toomey
f46777b272
Added code to output the final machine code in octal. Parse
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the 'i' argument to instructions that indicate indirect mode.
2016-02-24 11:15:47 +10:00
Warren Toomey
d70b4e87cc
First version of as7, which is definitely incomplete. I now need some
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example assembly programs and their machine code octal dumps so that
I can complete as7 and get it working properly.
2016-02-24 09:16:32 +10:00
