mu/subx/ex1.2.subx

## first program: same as https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html
#
# To run:
#   $ subx translate ex1.2.subx ex1
#   $ subx run ex1

== 0x08048054  # code segment, after leaving room for ELF header
# opcode        ModR/M                    SIB                   displacement    immediate
# instruction   mod, reg, Reg/Mem bits    scale, index, base
# 1-3 bytes     0/1 byte                  0/1 byte              0/1/2/4 bytes   0/1/2/4 bytes
  bb                                                                            42/imm32      # copy 0x2a (42) to EBX
  # exit(EBX)
  b8                                                                            1/imm32       # copy 1 to EAX
  cd                                                                            128/imm8      # int 80h

# 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`
			`#`
			`# To run:`
			`# $ subx translate ex1.2.subx ex1`
			`# $ subx run ex1`

4350 Reorganize layers to introduce the translation workflow right at the start. We also avoid duplicating parsing code. Programs are always parsed into the `program` data structure. 2018-07-16 05:59:02 +00:00			`== 0x08048054 # code segment, after leaving room for ELF header`
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			`# opcode ModR/M SIB displacement immediate`
			`# instruction mod, reg, Reg/Mem bits scale, index, base`
			`# 1-3 bytes 0/1 byte 0/1 byte 0/1/2/4 bytes 0/1/2/4 bytes`
4304 2018-07-01 18:25:39 +00:00			`bb 42/imm32 # copy 0x2a (42) to EBX`
4325 2018-07-08 06:13:25 +00:00			`# exit(EBX)`
4320 Fix a few more typos in example programs. 2018-07-07 17:42:38 +00:00			`b8 1/imm32 # copy 1 to EAX`
4304 2018-07-01 18:25:39 +00:00			`cd 128/imm8 # int 80h`
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`