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| author | Kartik Agaram <vc@akkartik.com> | 2018-09-30 20:59:21 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-09-30 20:59:21 -0700 |
| commit | b515f3b70417c502991e3c6443badf32cded6a20 (patch) | |
| tree | 603d4e51c29a6db6ec37f46fd073f55aff3b01d4 /subx/examples/ex1.subx | |
| parent | 16db2a2fde06be9641cc90a57029aaadb754edc3 (diff) | |
| download | mu-b515f3b70417c502991e3c6443badf32cded6a20.tar.gz | |
4622
When I started SubX I imagined that being able to write machine code directly was a feature. Now it's just a hole I haven't bothered closing yet.
Diffstat (limited to 'subx/examples/ex1.subx')
| -rw-r--r-- | subx/examples/ex1.subx | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/subx/examples/ex1.subx b/subx/examples/ex1.subx new file mode 100644 index 00000000..a355ef6b --- /dev/null +++ b/subx/examples/ex1.subx @@ -0,0 +1,20 @@ +## first program: same as https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html +# Just return 42. +# +# To run: +# $ subx translate ex1.2.subx ex1 +# $ subx run ex1 +# Expected result: +# $ echo $? +# 42 + +== code +# instruction effective address operand displacement immediate +# op subop mod rm32 base index scale r32 +# 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes + bb/copy 2a/imm32 # copy 42 to EBX + # exit(EBX) + b8/copy 1/imm32 # copy 1 to EAX + cd/syscall 0x80/imm8 + +# vim:ft=subx |