First commit
This commit is contained in:
commit
e6b09df3d7
|
@ -0,0 +1,2 @@
|
|||
minibfc
|
||||
bf
|
|
@ -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.
|
||||
|
||||
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;
|
||||
|
||||
ii. moral rights retained by the original author(s) and/or performer(s);
|
||||
|
||||
iii. publicity and privacy rights pertaining to a person's image or likeness
|
||||
depicted in a Work;
|
||||
|
||||
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;
|
||||
|
||||
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
|
||||
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
|
||||
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
|
||||
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
|
||||
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.
|
||||
|
||||
4. Limitations and Disclaimers.
|
||||
|
||||
a. No trademark or patent rights held by Affirmer are waived, abandoned,
|
||||
surrendered, licensed or otherwise affected by this document.
|
||||
|
||||
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
|
||||
or other rights required for any use of the Work.
|
||||
|
||||
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/>
|
|
@ -0,0 +1,237 @@
|
|||
BITS 64
|
||||
|
||||
org 0x400000
|
||||
|
||||
elf_header:
|
||||
db 0x7f, "ELF"
|
||||
db 2 ; 64 bit
|
||||
db 1 ; little-endian
|
||||
db 1 ; header version 1
|
||||
db 0 ; SysV ABI
|
||||
times 8 db 0 ; padding
|
||||
dw 2 ; executable
|
||||
dw 0x3e ; amd64
|
||||
dd 1 ; ELF version 1
|
||||
dq _start ; entry point
|
||||
dq program_headers - $$ ; program header table offset
|
||||
dq 0 ; section header table offset, not needed in executables
|
||||
dd 0 ; flags, unsused on x86
|
||||
dw elf_header_length ; header length
|
||||
dw program_header_size ; size of one entry in program header table
|
||||
dw 1 ; 1 entry
|
||||
dw 0 ; size of one entry in section header table
|
||||
dw 0 ; number of entries in the section header table
|
||||
dw 0 ; section name index in section header table
|
||||
|
||||
elf_header_length equ $ - elf_header
|
||||
|
||||
program_headers:
|
||||
dd 1 ; loadable segment
|
||||
dd 4 + 1 ; readable + executable
|
||||
dq 0 ; offset of contents
|
||||
dq $$ ; location in virtual memory
|
||||
dq 0 ; undefined
|
||||
fsize_offset equ $ - $$
|
||||
dq _end - $$ ; size of segment in file
|
||||
msize_offset equ $ - $$
|
||||
dq _end - $$ ; size of segment in memory
|
||||
dq 0x1000 ; 4KiB alignment
|
||||
|
||||
program_header_size equ $ - program_headers
|
||||
|
||||
headers_length equ $ - elf_header
|
||||
|
||||
_start:
|
||||
sub rsp, 0x10000 ; 64KiB of scratch space
|
||||
mov rdi, rsp
|
||||
|
||||
.copy_header:
|
||||
mov rsi, $$
|
||||
mov rcx, headers_length
|
||||
rep movsb
|
||||
|
||||
.copy_init:
|
||||
mov rsi, init_code
|
||||
mov rcx, init_code_length
|
||||
rep movsb
|
||||
|
||||
mov rbp, rdi
|
||||
|
||||
mainloop:
|
||||
; Read one byte
|
||||
mov rax, 0
|
||||
mov rdi, 0
|
||||
mov rsi, rbp
|
||||
mov rdx, 1
|
||||
syscall
|
||||
|
||||
.was_eof:
|
||||
test rax, rax
|
||||
jz end
|
||||
|
||||
mov al, [rbp]
|
||||
|
||||
mov rcx, 8
|
||||
mov rbx, command_table
|
||||
xor rdx, rdx
|
||||
|
||||
.table_find:
|
||||
mov dl, [rbx+1]
|
||||
cmp al, [rbx]
|
||||
je .table_found
|
||||
add dl, 2
|
||||
add rbx, rdx
|
||||
loop .table_find
|
||||
xor rdx, rdx
|
||||
|
||||
.table_found:
|
||||
lea rsi, [rbx + 2]
|
||||
|
||||
mov rdi, rbp
|
||||
mov rcx, rdx
|
||||
rep movsb
|
||||
mov rbp, rdi
|
||||
|
||||
jmp mainloop
|
||||
|
||||
end:
|
||||
.copy_end_code:
|
||||
mov rsi, end_code
|
||||
mov rdi, rbp
|
||||
mov rcx, end_code_length
|
||||
rep movsb
|
||||
mov rbp, rdi
|
||||
|
||||
.adjust_header_sizes:
|
||||
mov rcx, rdi
|
||||
sub rcx, rsp
|
||||
mov [rsp + fsize_offset], rcx
|
||||
mov [rsp + msize_offset], rcx
|
||||
|
||||
mov rsi, rsp
|
||||
add rsi, headers_length
|
||||
.fixup_loop:
|
||||
cmp rsi, rbp
|
||||
je .fixup_done
|
||||
|
||||
lodsb
|
||||
cmp al, 0xe9 ; Relative jump
|
||||
jne .fixup_loop
|
||||
|
||||
lodsb
|
||||
.is_forwards:
|
||||
test al, al
|
||||
jnz .is_backwards
|
||||
|
||||
; Push our current location (one byte after the start of the displacement)
|
||||
push rsi
|
||||
jmp .fixup_loop
|
||||
|
||||
.is_backwards:
|
||||
cmp al, 1
|
||||
jnz .fixup_loop
|
||||
|
||||
; Get matching ['s location
|
||||
pop rdi
|
||||
|
||||
; Distance between the locations = distance between jumps = displacement when jumping forwards
|
||||
mov rax, rsi
|
||||
sub rax, rdi
|
||||
|
||||
; Store in ['s displacement field
|
||||
dec rdi
|
||||
stosd
|
||||
|
||||
; Jumping backwards, we need to invert the displacement and then account for the size of the [
|
||||
neg rax
|
||||
xor rbx, rbx
|
||||
mov byte bl, [while_length]
|
||||
sub rax, rbx
|
||||
|
||||
; Store in our displacement field
|
||||
mov rdi, rsi
|
||||
dec rdi
|
||||
stosd
|
||||
|
||||
; Move to next instruction
|
||||
mov rsi, rdi
|
||||
jmp .fixup_loop
|
||||
|
||||
.fixup_done:
|
||||
|
||||
xor rbx, rbx
|
||||
.output_loop:
|
||||
mov rsi, rsp
|
||||
add rsi, rbx
|
||||
cmp rsi, rbp
|
||||
|
||||
je .exit
|
||||
mov rax, 1
|
||||
mov rdi, 1
|
||||
mov rdx, 1
|
||||
syscall
|
||||
|
||||
inc rbx
|
||||
jmp .output_loop
|
||||
|
||||
.exit:
|
||||
mov rax, 60
|
||||
xor rdi, rdi
|
||||
syscall
|
||||
|
||||
command_table:
|
||||
plus: db '+', minus - $ - 2
|
||||
inc byte [rbx]
|
||||
minus: db '-', right - $ - 2
|
||||
dec byte [rbx]
|
||||
right: db '>', left - $ - 2
|
||||
inc rbx
|
||||
left: db '<', while - $ - 2
|
||||
dec rbx
|
||||
while: db '['
|
||||
while_length: db wend - $ - 1
|
||||
|
||||
cmp byte [rbx], 0
|
||||
jne .skip
|
||||
; Reserve space for jump forwards, tag with 0x00000000
|
||||
db 0xe9
|
||||
times 4 db 0
|
||||
.skip:
|
||||
wend: db ']', getc - $ - 2
|
||||
; Reserve space for jump backwards, tag with 0x01000000
|
||||
db 0xe9
|
||||
db 1
|
||||
times 3 db 0
|
||||
getc: db ',', putc - $ - 2
|
||||
mov byte [rbx], 0
|
||||
mov rax, 0
|
||||
mov rdi, 0
|
||||
mov rsi, rbx
|
||||
mov rdx, 1
|
||||
syscall
|
||||
putc: db '.', ._end - $ - 2
|
||||
mov rax, 1
|
||||
mov rdi, 0
|
||||
mov rsi, rbx
|
||||
mov rdx, 1
|
||||
syscall
|
||||
._end:
|
||||
|
||||
init_code:
|
||||
mov rcx, 0x10000 ; 64KiB of memory
|
||||
sub rsp, rcx
|
||||
mov rdi, rsp
|
||||
mov rbx, rdi
|
||||
xor al, al
|
||||
rep stosb
|
||||
|
||||
init_code_length equ $ - init_code
|
||||
|
||||
end_code:
|
||||
mov rax, 60
|
||||
xor rdi, rdi
|
||||
syscall
|
||||
|
||||
end_code_length equ $ - end_code
|
||||
|
||||
_end:
|
Loading…
Reference in New Issue