First commit
This commit is contained in:
Juhani Krekelä
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1
.gitignore
vendored
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1
.gitignore
vendored
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@ -0,0 +1 @@
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|||
*.bin
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||||
116
CC0
Normal file
116
CC0
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|
@ -0,0 +1,116 @@
|
|||
CC0 1.0 Universal
|
||||
|
||||
Statement of Purpose
|
||||
|
||||
The laws of most jurisdictions throughout the world automatically confer
|
||||
exclusive Copyright and Related Rights (defined below) upon the creator and
|
||||
subsequent owner(s) (each and all, an "owner") of an original work of
|
||||
authorship and/or a database (each, a "Work").
|
||||
|
||||
Certain owners wish to permanently relinquish those rights to a Work for the
|
||||
purpose of contributing to a commons of creative, cultural and scientific
|
||||
works ("Commons") that the public can reliably and without fear of later
|
||||
claims of infringement build upon, modify, incorporate in other works, reuse
|
||||
and redistribute as freely as possible in any form whatsoever and for any
|
||||
purposes, including without limitation commercial purposes. These owners may
|
||||
contribute to the Commons to promote the ideal of a free culture and the
|
||||
further production of creative, cultural and scientific works, or to gain
|
||||
reputation or greater distribution for their Work in part through the use and
|
||||
efforts of others.
|
||||
|
||||
For these and/or other purposes and motivations, and without any expectation
|
||||
of additional consideration or compensation, the person associating CC0 with a
|
||||
Work (the "Affirmer"), to the extent that he or she is an owner of Copyright
|
||||
and Related Rights in the Work, voluntarily elects to apply CC0 to the Work
|
||||
and publicly distribute the Work under its terms, with knowledge of his or her
|
||||
Copyright and Related Rights in the Work and the meaning and intended legal
|
||||
effect of CC0 on those rights.
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||||
|
||||
1. Copyright and Related Rights. A Work made available under CC0 may be
|
||||
protected by copyright and related or neighboring rights ("Copyright and
|
||||
Related Rights"). Copyright and Related Rights include, but are not limited
|
||||
to, the following:
|
||||
|
||||
i. the right to reproduce, adapt, distribute, perform, display, communicate,
|
||||
and translate a Work;
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||||
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||||
ii. moral rights retained by the original author(s) and/or performer(s);
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||||
|
||||
iii. publicity and privacy rights pertaining to a person's image or likeness
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||||
depicted in a Work;
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||||
|
||||
iv. rights protecting against unfair competition in regards to a Work,
|
||||
subject to the limitations in paragraph 4(a), below;
|
||||
|
||||
v. rights protecting the extraction, dissemination, use and reuse of data in
|
||||
a Work;
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||||
|
||||
vi. database rights (such as those arising under Directive 96/9/EC of the
|
||||
European Parliament and of the Council of 11 March 1996 on the legal
|
||||
protection of databases, and under any national implementation thereof,
|
||||
including any amended or successor version of such directive); and
|
||||
|
||||
vii. other similar, equivalent or corresponding rights throughout the world
|
||||
based on applicable law or treaty, and any national implementations thereof.
|
||||
|
||||
2. Waiver. To the greatest extent permitted by, but not in contravention of,
|
||||
applicable law, Affirmer hereby overtly, fully, permanently, irrevocably and
|
||||
unconditionally waives, abandons, and surrenders all of Affirmer's Copyright
|
||||
and Related Rights and associated claims and causes of action, whether now
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||||
known or unknown (including existing as well as future claims and causes of
|
||||
action), in the Work (i) in all territories worldwide, (ii) for the maximum
|
||||
duration provided by applicable law or treaty (including future time
|
||||
extensions), (iii) in any current or future medium and for any number of
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||||
copies, and (iv) for any purpose whatsoever, including without limitation
|
||||
commercial, advertising or promotional purposes (the "Waiver"). Affirmer makes
|
||||
the Waiver for the benefit of each member of the public at large and to the
|
||||
detriment of Affirmer's heirs and successors, fully intending that such Waiver
|
||||
shall not be subject to revocation, rescission, cancellation, termination, or
|
||||
any other legal or equitable action to disrupt the quiet enjoyment of the Work
|
||||
by the public as contemplated by Affirmer's express Statement of Purpose.
|
||||
|
||||
3. Public License Fallback. Should any part of the Waiver for any reason be
|
||||
judged legally invalid or ineffective under applicable law, then the Waiver
|
||||
shall be preserved to the maximum extent permitted taking into account
|
||||
Affirmer's express Statement of Purpose. In addition, to the extent the Waiver
|
||||
is so judged Affirmer hereby grants to each affected person a royalty-free,
|
||||
non transferable, non sublicensable, non exclusive, irrevocable and
|
||||
unconditional license to exercise Affirmer's Copyright and Related Rights in
|
||||
the Work (i) in all territories worldwide, (ii) for the maximum duration
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||||
provided by applicable law or treaty (including future time extensions), (iii)
|
||||
in any current or future medium and for any number of copies, and (iv) for any
|
||||
purpose whatsoever, including without limitation commercial, advertising or
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||||
promotional purposes (the "License"). The License shall be deemed effective as
|
||||
of the date CC0 was applied by Affirmer to the Work. Should any part of the
|
||||
License for any reason be judged legally invalid or ineffective under
|
||||
applicable law, such partial invalidity or ineffectiveness shall not
|
||||
invalidate the remainder of the License, and in such case Affirmer hereby
|
||||
affirms that he or she will not (i) exercise any of his or her remaining
|
||||
Copyright and Related Rights in the Work or (ii) assert any associated claims
|
||||
and causes of action with respect to the Work, in either case contrary to
|
||||
Affirmer's express Statement of Purpose.
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||||
|
||||
4. Limitations and Disclaimers.
|
||||
|
||||
a. No trademark or patent rights held by Affirmer are waived, abandoned,
|
||||
surrendered, licensed or otherwise affected by this document.
|
||||
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||||
b. Affirmer offers the Work as-is and makes no representations or warranties
|
||||
of any kind concerning the Work, express, implied, statutory or otherwise,
|
||||
including without limitation warranties of title, merchantability, fitness
|
||||
for a particular purpose, non infringement, or the absence of latent or
|
||||
other defects, accuracy, or the present or absence of errors, whether or not
|
||||
discoverable, all to the greatest extent permissible under applicable law.
|
||||
|
||||
c. Affirmer disclaims responsibility for clearing rights of other persons
|
||||
that may apply to the Work or any use thereof, including without limitation
|
||||
any person's Copyright and Related Rights in the Work. Further, Affirmer
|
||||
disclaims responsibility for obtaining any necessary consents, permissions
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||||
or other rights required for any use of the Work.
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||||
|
||||
d. Affirmer understands and acknowledges that Creative Commons is not a
|
||||
party to this document and has no duty or obligation with respect to this
|
||||
CC0 or use of the Work.
|
||||
|
||||
For more information, please see
|
||||
<http://creativecommons.org/publicdomain/zero/1.0/>
|
||||
15
Makefile
Normal file
15
Makefile
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@ -0,0 +1,15 @@
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.SUFFIXES:
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.SUFFIXES: .asm .bin
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all: anattos.bin
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.asm.bin:
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nasm -fbin -o $@ $<
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clean:
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rm -f *.bin
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run: anattos.bin
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qemu-system-i386 -fda $<
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.PHONY: all clean run
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24
README.md
Normal file
24
README.md
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@ -0,0 +1,24 @@
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AnattOS
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=======
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AnattOS is a 512 byte memory editor with convenience features for hand
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programming machine code.
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Interface
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---------
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256 bytes of memory are show in a 16 by 16 grid. Each line of 16 bytes is
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checksummed with Fletcher-16, and the checksum is displayed after the line.
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||||
The address under the cursor is displayed below the memory dump.
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||||
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||||
If the byte under the cursor begins an instruction where the opcode and
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mod-r/m bytes' fields have the standard meanings, the fields' meanings are
|
||||
decoded and shown below the address. Note that the case of mod=0 r/m=6 is
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not special cased, and will display `bp` for the r/m field.
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Arrow keys can be used to navigate the memory, and `r` to call into the
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address under the cursor. When returning to AnattOS the code should restore
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segment registers, direction flag, and stack pointer to the values they had
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upon entry.
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Limitations
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||||
-----------
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AnattOS is only able to examine first 64KiB of RAM.
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388
anattos.asm
Normal file
388
anattos.asm
Normal file
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|
@ -0,0 +1,388 @@
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|||
; CC0 2021 nortti
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org 0x7c00
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jmp 0:start
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start:
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cld
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cli
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xor dx, dx
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mov ds, dx
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mov ss, dx
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mov sp, $$
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sti
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||||
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; VGA video memory
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mov ax, 0xb800
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mov es, ax
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; Start at bootloader
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mov bx, $$
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init_screen:
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||||
; Set 80x25 text mode
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mov ax, 3
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int 0x10
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; Clear screen
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xor di, di
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xor ax, ax
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mov cx, 80 * 25
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rep stosw
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mainloop:
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; Align dump display to 256 byte page
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mov si, 0xff00
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and si, bx
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; Display RAM contents
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xor di, di
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mov bp, 256
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.dump:
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cmp si, bx
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jne .not_cursor
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||||
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||||
; Set cursor
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pusha
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shr di, 1 ; Cursor position is in char cells
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mov dx, 0x3d4
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mov al, 0x0f ; Lower 8 bits of position
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out dx, al
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inc dx
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mov ax, di
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out dx, al
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mov dx, 0x3d4
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mov al, 0x0e ; Higher 8 bits of position
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out dx, al
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inc dx
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mov ax, di
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mov al, ah
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out dx, al
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popa
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||||
.not_cursor:
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lodsb
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call hexprint8
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; Fletcher-16
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add dl, al
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adc dl, 0
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add dh, dl
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adc dh, 0
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inc di
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inc di
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dec bp
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test bp, 0x0f
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jnz .dump
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inc di
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inc di
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mov ax, dx
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call hexprint16
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xor dx, dx
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add di, (80 - 16*3 - 5)*2
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test bp, bp
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jnz .dump
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.end_dump:
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||||
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||||
; Display address
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mov di, 17 * 80 * 2
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mov ax, bx
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call hexprint16
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xor ax, ax
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||||
call disasm
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||||
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||||
; Read user input
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int 0x16
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||||
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||||
.left:
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||||
cmp ah, 0x4b
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||||
jne .right
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||||
dec bx
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||||
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||||
.right:
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||||
cmp ah, 0x4d
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||||
jne .up
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||||
inc bx
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||||
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||||
.up:
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||||
cmp ah, 0x48
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||||
jne .down
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||||
sub bx, 16
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||||
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||||
.down:
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||||
cmp ah, 0x50
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||||
jne .digit09
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||||
add bx, 16
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||||
|
||||
.digit09:
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||||
cmp al, '0'
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||||
jb .digitaf
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||||
cmp al, '9'
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||||
ja .digitaf
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||||
sub al, '0'
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||||
jmp digit
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||||
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||||
.digitaf:
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||||
cmp al, 'a'
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||||
jb .r
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||||
cmp al, 'f'
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||||
ja .r
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||||
sub al, 'a' - 10
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||||
jmp digit
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||||
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||||
.r:
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||||
cmp al, 'r'
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mov al, 0xff
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||||
jne digit.update_nybble
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||||
|
||||
pusha
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||||
call bx
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||||
popa
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||||
jmp init_screen
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||||
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||||
digit:
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||||
; 00 … 0f are stored nybbles, other values are sentinels
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||||
test byte [high_nybble], 0xf0
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||||
jnz .update_nybble
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mov cl, [high_nybble]
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shl cl, 4
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or al, cl
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||||
mov [bx], al
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inc bx
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||||
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||||
mov al, 0xff
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||||
|
||||
.update_nybble:
|
||||
mov [high_nybble], al
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||||
jmp mainloop
|
||||
|
||||
; IN:
|
||||
; ah = 0
|
||||
; bx = offset
|
||||
disasm:
|
||||
pusha
|
||||
mov si, bx
|
||||
mov di, 19 * 80 * 2
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mov cx, 2 * 80
|
||||
push di
|
||||
rep stosw
|
||||
pop di
|
||||
|
||||
; Opcode byte
|
||||
lodsb
|
||||
mov dl, al
|
||||
shr al, 1
|
||||
cmp al, 0x7f ; fe ff
|
||||
jz .do_disasm
|
||||
test al, 0x62 ; add, or, adc, sbb, and, sub, xor, cmp
|
||||
jz .do_disasm
|
||||
cmp al, 0x40
|
||||
jb .no_disasm
|
||||
cmp al, 0x45 ; 80 81 82 83, test, mov
|
||||
jbe .do_disasm
|
||||
cmp al, 0x60 ; c0 c1
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||||
je .do_disasm
|
||||
jb .no_disasm
|
||||
cmp al, 0x62 ; c4 c5
|
||||
je .do_disasm
|
||||
test al, 0x16 ; d0 d1 d2 d3
|
||||
jnz .no_disasm
|
||||
|
||||
.do_disasm:
|
||||
; Opcode
|
||||
shr al, 1
|
||||
call hexprint8
|
||||
|
||||
inc di
|
||||
inc di
|
||||
|
||||
; Direction / extend
|
||||
mov ax, 0x0700 + ' '
|
||||
test dl, 2
|
||||
jz .print_direction
|
||||
mov al, 's'
|
||||
.print_direction:
|
||||
stosw
|
||||
|
||||
inc di
|
||||
inc di
|
||||
|
||||
; Width
|
||||
mov al, 'b'
|
||||
test dl, 1
|
||||
jz .print_width
|
||||
mov al, 'w'
|
||||
.print_width:
|
||||
stosw
|
||||
|
||||
add di, (80 - 6) * 2
|
||||
|
||||
; Mod-reg-r/m byte
|
||||
lodsb
|
||||
mov dh, al
|
||||
|
||||
; Mode
|
||||
shr al, 6
|
||||
call hexprint4
|
||||
|
||||
inc di
|
||||
inc di
|
||||
|
||||
; Reg or opcode extension
|
||||
mov al, 0x38
|
||||
and al, dh
|
||||
shr al, 3
|
||||
cmp dl, 0x80
|
||||
jb .not_op_ext
|
||||
cmp dl, 0x83 ; 80 81 82 83
|
||||
jbe .op_ext
|
||||
cmp dl, 0x8b ; test mov
|
||||
jbe .not_op_ext
|
||||
|
||||
.op_ext:
|
||||
call hexprint4
|
||||
jmp .skip_print_reg
|
||||
|
||||
.not_op_ext:
|
||||
call .reg
|
||||
|
||||
.skip_print_reg:
|
||||
inc di
|
||||
inc di
|
||||
|
||||
; R/m
|
||||
mov al, 0x07
|
||||
and al, dh
|
||||
cmp dh, 0xc0 ; Hacky way to check if top two bits are both set
|
||||
jb .base
|
||||
call .reg
|
||||
|
||||
.no_disasm:
|
||||
popa
|
||||
ret
|
||||
|
||||
.reg:
|
||||
xor bx, bx
|
||||
mov bl, al
|
||||
|
||||
test dl, 1
|
||||
jz .reg8
|
||||
mov al, byte [bx + register_first]
|
||||
stosw
|
||||
|
||||
shr bx, 1
|
||||
mov al, byte [bx + register_second]
|
||||
stosw
|
||||
|
||||
ret
|
||||
|
||||
.reg8:
|
||||
mov cl, al
|
||||
shr cl, 2
|
||||
|
||||
and bl, 3
|
||||
mov al, byte [bx + register_first]
|
||||
stosw
|
||||
|
||||
mov bl, cl
|
||||
mov al, byte [bx + register_halves]
|
||||
stosw
|
||||
|
||||
ret
|
||||
|
||||
.base:
|
||||
mov cl, al
|
||||
test al, 4
|
||||
jnz .base47
|
||||
|
||||
mov al, 'b'
|
||||
stosw
|
||||
|
||||
mov bx, 2
|
||||
and bl, cl
|
||||
shr bl, 1
|
||||
mov al, byte [bx + base_first]
|
||||
stosw
|
||||
|
||||
mov al, '+'
|
||||
stosw
|
||||
|
||||
.si_di:
|
||||
mov bl, 1
|
||||
and bl, cl
|
||||
mov al, byte [bx + base_second]
|
||||
stosw
|
||||
|
||||
mov al, 'i'
|
||||
stosw
|
||||
|
||||
popa
|
||||
ret
|
||||
|
||||
.base47:
|
||||
test al, 2
|
||||
jz .si_di
|
||||
|
||||
mov al, 'b'
|
||||
stosw
|
||||
|
||||
mov bx, 7
|
||||
sub bl, cl
|
||||
mov al, byte [bx + base_first]
|
||||
stosw
|
||||
|
||||
popa
|
||||
ret
|
||||
|
||||
register_first db 'acdbsb'
|
||||
base_second db 'sd'
|
||||
|
||||
register_second db 'x'
|
||||
base_first db 'xp'
|
||||
db 'i'
|
||||
|
||||
register_halves db 'lh'
|
||||
|
||||
; IN: ax/al/al = number
|
||||
; UPDATE: di = index into video memory
|
||||
hexprint16:
|
||||
xchg al, ah
|
||||
call hexprint8
|
||||
xchg al, ah
|
||||
|
||||
hexprint8:
|
||||
rol al, 4
|
||||
call hexprint4
|
||||
rol al, 4
|
||||
|
||||
hexprint4:
|
||||
push ax
|
||||
and al, 0xf
|
||||
|
||||
cmp al, 10
|
||||
jb .below_10
|
||||
add al, 'a' - '0' - 10
|
||||
|
||||
.below_10:
|
||||
add al, '0'
|
||||
|
||||
; 07 = white on black
|
||||
mov ah, 0x07
|
||||
stosw
|
||||
pop ax
|
||||
ret
|
||||
|
||||
times 510 - ($ - $$) db 0
|
||||
high_nybble db 0x55, 0xaa
|
||||
Loading…
Add table
Reference in a new issue