mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

	Commit message (Collapse)	Author	Age	Files	Lines
*	7476	Kartik Agaram	2020-12-30	1	-1/+1
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*	6958	Kartik Agaram	2020-10-05	1	-31/+31
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*	6397	Kartik Agaram	2020-05-24	1	-0/+271
	Drop '---' section boundaries from filenames. I noticed them confusing tab-completion for certain advanced shell setups.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Mu - baremetal/112read-byte.subx</title> <meta name="Generator" content="Vim/8.1"> <meta name="plugin-version" content="vim8.1_v1"> <meta name="syntax" content="none"> <meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> <meta name="colorscheme" content="minimal-light"> <style type="text/css">  </style> <script type='text/javascript'>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/baremetal/112read-byte.subx'>https://github.com/akkartik/mu/blob/main/baremetal/112read-byte.subx</a> <pre id='vimCodeElement'> 1 # Read a single byte from a stream. 2 # 3 # We need to do this in machine code because streams need to be opaque types, 4 # and we don't yet support opaque types in Mu. 5 6 == code 7 # instruction effective address register displacement immediate 8 # . op subop mod rm32 base index scale r32 9 # . 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 10 11 # Return next byte value in eax, with top 3 bytes cleared. 12 # Abort on reaching end of stream. 13 read-byte: # s: (addr stream byte) -> result/eax: byte 14 # . prologue 15 55/push-ebp 16 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp 17 # . save registers 18 51/push-ecx 19 56/push-esi 20 # esi = s 21 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi 22 # ecx = s->read 23 8b/copy 1/mod/*+disp8 6/rm32/esi . . . 1/r32/ecx 4/disp8 . # copy *(esi+4) to ecx 24 # if (f->read >= f->write) abort 25 3b/compare 0/mod/indirect 6/rm32/esi . . . 1/r32/ecx . . # compare ecx with *esi 26 0f 8d/jump-if->= $read-byte:<a href='501draw-text.mu.html#L519'>abort</a>/disp32 27 # result = f->data[f->read] 28 31/xor 3/mod/direct 0/rm32/eax . . . 0/r32/eax . . # clear eax 29 8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx . 0/r32/AL 0xc/disp8 . # copy byte at *(esi+ecx+12) to AL 30 # ++f->read 31 ff 0/subop/increment 1/mod/*+disp8 6/rm32/esi . . . . 4/disp8 . # increment *(esi+4) 32 $read-byte:end: 33 # . restore registers 34 5e/pop-to-esi 35 59/pop-to-ecx 36 # . epilogue 37 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 38 5d/pop-to-ebp 39 c3/return 40 41 $read-byte:<a href='501draw-text.mu.html#L519'>abort</a>: 42 (<a href='501draw-text.mu.html#L222'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> 0 "read-byte: empty stream" 3 0) # 3=cyan 43 { 44 eb/jump loop/disp8 45 } 46 # never gets here 47 48 == data 49 50 _test-input-stream: # (stream byte) 51 # current write index 52 0/imm32 53 # current read index 54 0/imm32 55 # size 56 0x400/imm32 # 1024 bytes 57 # data (64 lines x 16 bytes/line) 58 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 59 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 62 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 63 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 64 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 65 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 66 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 67 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 68 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 69 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 71 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 73 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 74 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 75 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 76 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 77 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 78 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 81 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 82 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 83 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 84 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 85 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 86 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 87 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 88 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 89 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 91 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 92 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 93 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 94 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 95 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 96 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 97 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 98 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 99 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 101 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 102 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 103 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 104 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 105 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 106 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 107 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 108 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 109 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 111 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 112 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 113 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 114 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 115 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 116 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 117 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 118 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 119 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 121 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 122 123 # . . vim:nowrap:textwidth=0 </pre> </body> </html>