From 113bae7311b63e55e55160970718d19bfeeb56c3 Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Wed, 1 Jan 2020 17:23:29 -0800 Subject: 5856 --- html/apps/ex5.subx.html | 102 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 html/apps/ex5.subx.html (limited to 'html/apps/ex5.subx.html') diff --git a/html/apps/ex5.subx.html b/html/apps/ex5.subx.html new file mode 100644 index 00000000..f5112fa7 --- /dev/null +++ b/html/apps/ex5.subx.html @@ -0,0 +1,102 @@ + + + + +Mu - examples/ex5.subx + + + + + + + + + + +https://github.com/akkartik/mu/blob/master/examples/ex5.subx +
+ 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
+
+ + + -- cgit 1.4.1-2-gfad0