Justine Tunney
1acabfcc6a
Restore direction flag clearing
2021-11-21 03:44:20 -08:00
Justine Tunney
814c61aeae
Shave another sixteen bytes (now 426 bytes)
...
The flag bit is now removed from atoms in favor of the sign bit.
That let us remove shifts. It also means NIL can be zero, which
freed up the %cx register. Using %cx to call Eval saved 2 bytes.
Saved six bytes removing bss memset as it's not needed anymore.
2021-11-17 08:41:36 -08:00
Justine Tunney
a8f04bc73f
Make objdump -Mi8086 sectorlisp.o output look nicer
2021-11-16 22:05:08 -08:00
Justine Tunney
e90a728894
Unshave four bytes for IBM PC compatibility
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Ability to run on original hardware is confirmed.
2021-11-16 10:46:28 -08:00
Justine Tunney
1e9c7fca35
Shave another fifteen bytes (now 438 bytes)
...
%bx wasn't needed in PutChar since we're assuming the machine boots
in a non-graphical mode, i.e. BIOS teletype. In MDA mode BX will be
2 which is dark green on black. The same probably applies with CGA.
Now that BX is always two, we can now use multi-register addressing
when accessing CDR cells. That's a huge savings, since we no longer
need all those displacement bytes; we only need the modrm.
%cx wasn't needed it could be replaced with %si in GetToken thereby
making it possible to remove our use of the %fs register.
Changing the second argument Cons() from %si not %ax helped to save
even more space, since all the things that called it needed to move
the register from %ax to %si.
2021-11-16 10:17:10 -08:00
Justine Tunney
49c538778a
Shave another byte and improve asm readability
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This changes fixes an issue where clearing the bss could overlap
the stack memory used in the early initialization code.
This change fixes a regression caused by an earlier commit with
nul terminators. Builtins are now automatically numbered.
Comments have been added and labels have been redefined to add
further clarity to how the assembly works. The most beautiful of
which is the code that merges Cadr, Cdr, and Car into one func.
2021-11-16 07:09:58 -08:00
Justine Tunney
532b92688e
Fix regression in C code for PrintList()
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Fixes #11
2021-11-16 00:05:30 -08:00
Peter Ferrie
522f0a16fd
shave two bytes, fix memory init
2021-11-15 21:05:27 -08:00
Justine Tunney
2c760a29e4
Fix extra arg in LISP evaluator
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Fixes #12 reported by @derhexenmeister
2021-11-13 15:16:37 -08:00
Peter Ferrie
df9c01c46c
back to 386+ CPU
2021-11-08 10:50:15 -08:00
Peter Ferrie
74b20f759e
shave one byte
2021-11-08 09:51:36 -08:00
Peter Ferrie
c2a2561366
trim binary
2021-11-08 08:10:54 -08:00
Peter Ferrie
8afbbdd383
shave some bytes
2021-11-08 08:09:12 -08:00
Peter Ferrie
21383822a7
Revert "shave another six bytes"
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This reverts commit 8f5f932098
2021-11-07 22:28:49 -08:00
Peter Ferrie
8f5f932098
shave another six bytes
2021-11-07 21:24:36 -08:00
Justine Tunney
9bb9c6e04c
Shave six more bytes
2021-11-07 12:32:23 -08:00
Justine Tunney
9f108b0d60
Merge pull request #10 from peterferrie/main
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shave some bytes
2021-11-06 00:59:27 -07:00
Peter Ferrie
98e028d13b
restore load address, no need to change after all
2021-11-05 15:21:25 -07:00
Peter Ferrie
0fb8fa3b2a
shave one more byte
2021-11-05 15:17:06 -07:00
Peter Ferrie
a0f739da58
shave some bytes
2021-11-05 14:30:46 -07:00
Peter Ferrie
ec2c93295f
shave two more bytes
2021-11-05 13:28:00 -07:00
Peter Ferrie
9cde674c1a
shave two more bytes
2021-11-05 12:35:03 -07:00
Peter Ferrie
93d01e6932
shave one more byte
2021-11-05 12:23:43 -07:00
Peter Ferrie
50c85199fe
shave one more byte
2021-11-05 11:58:36 -07:00
Peter Ferrie
69085d0674
shave two more bytes
2021-11-05 11:22:45 -07:00
Peter Ferrie
3cb4b9743f
shave one more byte
2021-11-05 10:47:36 -07:00
Peter Ferrie
bf27f44569
fix typo and avoid stack-race
2021-11-03 21:23:09 -07:00
Peter Ferrie
adb7310d57
shave some bytes
2021-11-02 12:14:10 -07:00
agreppin
1f066da3a1
Merge pull request #9 from peterferrie/main
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shave some bytes (credits @peterferrie)
2021-11-02 14:47:02 +01:00
Peter Ferrie
a469910340
shave some bytes
2021-10-31 09:54:36 -07:00
Justine Tunney
05d2bcbfd9
Improve LISP/C/ASM Rosetta Stone consistency
2021-10-30 00:42:55 -07:00
Justine Tunney
e09cdf6619
Remove more non-essential code
2021-10-26 19:53:17 -07:00
Justine Tunney
4233210a86
Remove old code and update documentation
2021-10-08 21:26:31 -07:00
Alain Greppin
cbb4ecc4d5
test files added
2021-10-03 17:03:58 +02:00
Alain Greppin
b77c74543d
latest sectorlisp.bin
2021-10-03 16:24:53 +02:00
Alain Greppin
3b26982d9c
Eval based on LISP 1.5 manual, 509 bytes
2021-09-28 05:25:24 -07:00
Ilya Kurdyukov
333c5efba4
smaller Intern function
2021-09-28 02:43:05 -07:00
Justine Tunney
2c1ddc26da
Fix LICENSE file name
2021-03-05 12:20:03 -08:00
Scott Wolchok
4a045620bb
Fix sizeof kSymbols
2021-02-27 22:57:06 -08:00
Scott Wolchok
1058c959d8
remove extra trailing NUL on kSymbols
...
It wastes a byte this way -- see https://godbolt.org/z/nEj9hc
See diff of hexdump of sectorlisp.bin before/after:
```
*** before.txt 2021-02-27 13:17:47.842081600 -0800
--- after.txt 2021-02-27 13:16:40.789140700 -0800
***************
*** 31,33 ****
000001e0: 4551 0043 4f4e 4400 4341 5200 4344 5200 EQ.COND.CAR.CDR.
! 000001f0: 434f 4e53 004c 414d 4244 4100 0090 55aa CONS.LAMBDA...U.
00000200: f7c7 0100 7509 d1ef 8db5 8641 e9a3 ff53 ....u......A...S
--- 31,33 ----
000001e0: 4551 0043 4f4e 4400 4341 5200 4344 5200 EQ.COND.CAR.CDR.
! 000001f0: 434f 4e53 004c 414d 4244 4100 6690 55aa CONS.LAMBDA.f.U.
00000200: f7c7 0100 7509 d1ef 8db5 8641 e9a3 ff53 ....u......A...S
```
Second zero byte after LAMBDA is now uninitialized.
2021-02-27 22:57:06 -08:00
Justine Tunney
8a29ec3b23
Reduce sectorlisp to 836 bytes
2021-02-04 01:18:34 -08:00
Justine Tunney
b64b27feb8
Merge pull request #1 from moon-chilled/main
...
Minor tweaks so the assembly builds with clang
2020-10-27 14:40:00 -07:00
Moonchild
d56afe537c
minor tweaks so the assembly builds with clang
2020-10-27 14:20:22 -07:00
Justine Tunney
665668a7a0
Reduce sectorlisp from 948 to 856 bytes
2020-10-27 13:45:12 -07:00
Justine Tunney
a561e031ae
Initial import
2020-10-26 18:21:15 -07:00
