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

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generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-16 17:32:43 +0000

; background-color: #c6c6c6; } body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; } a { color:inherit; } * { font-size:12pt; font-size: 1em; } .subxComment { color: #005faf; } .subxS2Comment { color: #8a8a8a; } .LineNr { } .subxS1Comment { color: #0000af; } .SpecialChar { color: #d70000; } .Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; } --> </style> <script type='text/javascript'>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/master/apps/ex5.subx'>https://github.com/akkartik/mu/blob/master/apps/ex5.subx</a> <pre id='vimCodeElement'> 1 # Read a character from stdin, save it to a local on the stack, write it to stdout. 2 # 3 # To run: 4 # $ ./subx translate init.linux examples/ex5.subx -o examples/ex5 5 # $ ./subx run examples/ex5 6 7 == code 8 # instruction effective address register displacement immediate 9 # . op subop mod rm32 base index scale r32 10 # . 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 11 12 Entry: 13 14 # allocate x on the stack 15 81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # subtract from esp 16 17 # read(stdin, x, 1) 18 # . fd = 0 (stdin) 19 bb/copy-to-ebx 0/imm32 20 # . data = x (location to write result to) 21 8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 4/disp8 . # copy esp+4 to ecx 22 # . size = 1 character 23 ba/copy-to-edx 1/imm32 24 # . syscall 25 e8/call syscall_read/disp32 26 27 # syscall(write, stdout, x, 1) 28 # . fd = 1 (stdout) 29 bb/copy-to-ebx 1/imm32 30 # . data = x (location to read from) 31 8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 4/disp8 . # copy esp+4 to ecx 32 # . size = 1 character 33 ba/copy-to-edx 1/imm32 34 # . syscall 35 b8/copy-to-eax 4/imm32/write 36 cd/syscall 0x80/imm8 37 38 # exit(ebx) 39 e8/call syscall_exit/disp32 40 41 # . . vim:nowrap:textwidth=0 </pre> </body> </html>