4437 - support for labels is half-done - mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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author	Kartik Agaram <vc@akkartik.com>	2018-07-27 10:58:15 -0700
committer	Kartik Agaram <vc@akkartik.com>	2018-07-27 10:58:15 -0700
commit	6b64f8009b9f98e9008be847ce7d475dc321e7de (patch)
tree	6478ab74f54553e7e9b66dbe606d2cab765388d9 /subx/013indirect_addressing.cc
parent	ab2ee1d4afe9cf595fd64ba306c43c3aa4ceb8ce (diff)
download	mu-6b64f8009b9f98e9008be847ce7d475dc321e7de.tar.gz

4437 - support for labels is half-done

Diffstat (limited to 'subx/013indirect_addressing.cc')

0 files changed, 0 insertions, 0 deletions

<!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 - subx/examples/ex7.subx</title> <meta name="Generator" content="Vim/8.0"> <meta name="plugin-version" content="vim7.4_v2"> <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"> <style type="text/css">  </style> <script type='text/javascript'>  </script> </head> <body onload='JumpToLine();'> <pre id='vimCodeElement'> 1 # Example showing file syscalls. 2 # 3 # Create a file, open it for writing, write a character to it, close it, open 4 # it for reading, read a character from it, close it, delete it, and return 5 # the character read. 6 # 7 # To run (from the subx directory): 8 # $ subx translate examples/ex7.subx -o examples/ex7 9 # $ subx run examples/ex7 10 # Expected result: 11 # $ echo $? 12 # 97 13 14 == code 15 # instruction effective address register displacement immediate 16 # . op subop mod rm32 base index scale r32 17 # . 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 18 19 # syscall(creat, Filename) 20 bb/copy-to-EBX Filename/imm32 21 b9/copy-to-ECX 0x180/imm32/fixed-perms 22 b8/copy-to-EAX 8/imm32/creat 23 cd/syscall 0x80/imm8 24 25 # stream = syscall(open, Filename, O_WRONLY, 0) # we can't use 'fd' because it looks like a hex byte 26 bb/copy-to-EBX Filename/imm32 27 b9/copy-to-ECX 1/imm32/wronly 28 ba/copy-to-EDX 0x180/imm32/fixed-perms 29 b8/copy-to-EAX 5/imm32/open 30 cd/syscall 0x80/imm8 31 # save stream 32 bb/copy-to-EBX Stream/imm32 33 89/copy 0/mod/indirect 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to *EBX 34 35 # syscall(write, Stream, "a", 1) 36 # . load stream 37 bb/copy-to-EBX Stream/imm32 38 8b/copy 0/mod/indirect 3/rm32/EBX . . . 3/r32/EBX . . # copy *EBX to EBX 39 # . 40 b9/copy-to-ECX A/imm32 41 ba/copy-to-EDX 1/imm32/size 42 b8/copy-to-EAX 4/imm32/write 43 cd/syscall 0x80/imm8 44 45 # syscall(close, Stream) 46 # . load stream 47 bb/copy-to-EBX Stream/imm32 48 8b/copy 0/mod/indirect 3/rm32/EBX . . . 3/r32/EBX . . # copy *EBX to EBX 49 # . 50 b8/copy-to-EAX 6/imm32/close 51 cd/syscall 0x80/imm8 52 53 # stream = syscall(open, Filename, O_RDONLY, 0) 54 bb/copy-to-EBX Filename/imm32 55 b9/copy-to-ECX 0/imm32/rdonly 56 ba/copy-to-EDX 0x180/imm32/fixed-perms 57 b8/copy-to-EAX 5/imm32/open 58 cd/syscall 0x80/imm8 59 # . save Stream 60 bb/copy-to-EBX Stream/imm32 61 89/copy 0/mod/indirect 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to *EBX 62 63 # syscall(read, Stream, B, 1) 64 # . load stream 65 bb/copy-to-EBX Stream/imm32 66 8b/copy 0/mod/indirect 3/rm32/EBX . . . 3/r32/EBX . . # copy *EBX to EBX 67 # . 68 b9/copy-to-ECX B/imm32 69 ba/copy-to-EDX 1/imm32/size 70 b8/copy-to-EAX 3/imm32/read 71 cd/syscall 0x80/imm8 72 73 # syscall(close, Stream) 74 # . load stream 75 bb/copy-to-EBX Stream/imm32 76 8b/copy 0/mod/indirect 3/rm32/EBX . . . 3/r32/EBX . . # copy *EBX to EBX 77 # 78 b8/copy-to-EAX 6/imm32/close 79 cd/syscall 0x80/imm8 80 81 # syscall(unlink, filename) 82 bb/copy-to-EBX Filename/imm32 83 b8/copy-to-EAX 0xa/imm32/unlink 84 cd/syscall 0x80/imm8 85 86 # syscall(exit, b) 87 # . load b 88 bb/copy-to-EBX B/imm32 89 8b/copy 0/mod/indirect 3/rm32/EBX . . . 3/r32/EBX . . # copy *EBX to EBX 90 # 91 b8/copy-to-EAX 1/imm32/exit 92 cd/syscall 0x80/imm8 93 94 == data 95 96 Stream: 97 00 00 00 00 98 A: 99 61 00 00 00 100 B: 101 00 00 00 00 102 Filename: 103 2e 66 6f 6f 00 00 00 00 104 105 # . . vim:nowrap:textwidth=0 </pre> </body> </html>


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