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*.exe | ||
*.out | ||
*.app | ||
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cmake-build-debug/* | ||
cmake-build-release/* | ||
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\.idea/workspace\.xml |
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cmake_minimum_required(VERSION 3.9) | ||
project(synacor_challenge) | ||
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set(CMAKE_CXX_STANDARD 11) | ||
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add_executable(synacor_challenge main.cpp) | ||
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add_custom_command(TARGET synacor_challenge POST_BUILD | ||
COMMAND ${CMAKE_COMMAND} -E copy | ||
"${PROJECT_SOURCE_DIR}/challenge.bin" | ||
$<TARGET_FILE_DIR:synacor_challenge>) |
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== Synacor Challenge == | ||
In this challenge, your job is to use this architecture spec to create a | ||
virtual machine capable of running the included binary. Along the way, | ||
you will find codes; submit these to the challenge website to track | ||
your progress. Good luck! | ||
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== architecture == | ||
- three storage regions | ||
- memory with 15-bit address space storing 16-bit values | ||
- eight registers | ||
- an unbounded stack which holds individual 16-bit values | ||
- all numbers are unsigned integers 0..32767 (15-bit) | ||
- all math is modulo 32768; 32758 + 15 => 5 | ||
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== binary format == | ||
- each number is stored as a 16-bit little-endian pair (low byte, high byte) | ||
- numbers 0..32767 mean a literal value | ||
- numbers 32768..32775 instead mean registers 0..7 | ||
- numbers 32776..65535 are invalid | ||
- programs are loaded into memory starting at address 0 | ||
- address 0 is the first 16-bit value, address 1 is the second 16-bit value, etc | ||
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== execution == | ||
- After an operation is executed, the next instruction to read is immediately after the last argument of the current operation. If a jump was performed, the next operation is instead the exact destination of the jump. | ||
- Encountering a register as an operation argument should be taken as reading from the register or setting into the register as appropriate. | ||
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== hints == | ||
- Start with operations 0, 19, and 21. | ||
- Here's a code for the challenge website: jBrgCAtLRSgu | ||
- The program "9,32768,32769,4,19,32768" occupies six memory addresses and should: | ||
- Store into register 0 the sum of 4 and the value contained in register 1. | ||
- Output to the terminal the character with the ascii code contained in register 0. | ||
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== opcode listing == | ||
halt: 0 | ||
stop execution and terminate the program | ||
set: 1 a b | ||
set register <a> to the value of <b> | ||
push: 2 a | ||
push <a> onto the stack | ||
pop: 3 a | ||
remove the top element from the stack and write it into <a>; empty stack = error | ||
eq: 4 a b c | ||
set <a> to 1 if <b> is equal to <c>; set it to 0 otherwise | ||
gt: 5 a b c | ||
set <a> to 1 if <b> is greater than <c>; set it to 0 otherwise | ||
jmp: 6 a | ||
jump to <a> | ||
jt: 7 a b | ||
if <a> is nonzero, jump to <b> | ||
jf: 8 a b | ||
if <a> is zero, jump to <b> | ||
add: 9 a b c | ||
assign into <a> the sum of <b> and <c> (modulo 32768) | ||
mult: 10 a b c | ||
store into <a> the product of <b> and <c> (modulo 32768) | ||
mod: 11 a b c | ||
store into <a> the remainder of <b> divided by <c> | ||
and: 12 a b c | ||
stores into <a> the bitwise and of <b> and <c> | ||
or: 13 a b c | ||
stores into <a> the bitwise or of <b> and <c> | ||
not: 14 a b | ||
stores 15-bit bitwise inverse of <b> in <a> | ||
rmem: 15 a b | ||
read memory at address <b> and write it to <a> | ||
wmem: 16 a b | ||
write the value from <b> into memory at address <a> | ||
call: 17 a | ||
write the address of the next instruction to the stack and jump to <a> | ||
ret: 18 | ||
remove the top element from the stack and jump to it; empty stack = halt | ||
out: 19 a | ||
write the character represented by ascii code <a> to the terminal | ||
in: 20 a | ||
read a character from the terminal and write its ascii code to <a>; it can be assumed that once input starts, it will continue until a newline is encountered; this means that you can safely read whole lines from the keyboard and trust that they will be fully read | ||
noop: 21 | ||
no operation |
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