mu/subx/examples/ex1.subx

## first program: same as https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html
# Just return 42.
#
# To run:
#   $ subx translate ex1.2.subx -o 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
4303 - subx: first real transform We'll see if this is useful. Mostly just stretching our legs. 2018-07-01 07:01:13 +00:00			`## first program: same as https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html`
4351 2018-07-16 14:55:07 +00:00			`# Just return 42.`
4303 - subx: first real transform We'll see if this is useful. Mostly just stretching our legs. 2018-07-01 07:01:13 +00:00			`#`
			`# To run:`
4624 Start requiring a '-o' flag to designate the output binary when translating. Things currently get funky if you pass in multiple inputs, but that's ok. This is the first step to supporting multiple input files for a single output binary. 2018-10-01 05:49:24 +00:00			`# $ subx translate ex1.2.subx -o ex1`
4303 - subx: first real transform We'll see if this is useful. Mostly just stretching our legs. 2018-07-01 07:01:13 +00:00			`# $ subx run ex1`
4446 2018-07-27 23:53:47 +00:00			`# Expected result:`
			`# $ echo $?`
			`# 42`
4303 - subx: first real transform We'll see if this is useful. Mostly just stretching our legs. 2018-07-01 07:01:13 +00:00
4531 - automatically compute segment addresses 2018-09-01 22:58:53 +00:00			`== code`
4467 2018-08-04 06:23:39 +00:00			`# 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`
4325 2018-07-08 06:13:25 +00:00			`# exit(EBX)`
4467 2018-08-04 06:23:39 +00:00			`b8/copy 1/imm32 # copy 1 to EAX`
4581 Even more cuddling. We want to keep lines short where the opcode and operands are self-explanatory. If there are any implicit registers, etc., we'll continue to do the table layout. The first two columns look messy now; let's see how this goes. Maybe I'll give up on the tabular layout altogether, just string args with a single space. 2018-09-21 23:55:46 +00:00			`cd/syscall 0x80/imm8`
4303 - subx: first real transform We'll see if this is useful. Mostly just stretching our legs. 2018-07-01 07:01:13 +00:00
			`# vim:ft=subx`