Mu - subx/068error-byte.subx

From 6e181e7fd998a0d542cb531c929c905a243ea2f6 Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Tue, 5 Feb 2019 23:30:12 -0800 Subject: 4953 --- html/subx/068error-byte.subx.html | 176 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 176 insertions(+) create mode 100644 html/subx/068error-byte.subx.html (limited to 'html/subx/068error-byte.subx.html') diff --git a/html/subx/068error-byte.subx.html b/html/subx/068error-byte.subx.html new file mode 100644 index 00000000..a8a5c7a7 --- /dev/null +++ b/html/subx/068error-byte.subx.html @@ -0,0 +1,176 @@ + + + + +Mu - subx/068error-byte.subx + + + + + + + + + + +https://github.com/akkartik/mu/blob/master/subx/068error-byte.subx +
+  1 # Print an error message followed by the text representation of a byte. Then exit.
+  2 
+  3 == code
+  4 #   instruction                     effective address                                                   register    displacement    immediate
+  5 # . op          subop               mod             rm32          base        index         scale       r32
+  6 # . 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
+  7 
+  8 # main:
+  9     # manual test
+ 10 #?     # . var ed/EAX : exit-descriptor
+ 11 #?     81          5/subop/subtract    3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # subtract from ESP
+ 12 #?     89/copy                         3/mod/direct    0/rm32/EAX    .           .             .           4/r32/ESP   .               .                 # copy ESP to EAX
+ 13 #?     # . configure ed to really exit()
+ 14 #?     # . . ed->target = 0
+ 15 #?     c7          0/subop/copy        0/mod/direct    0/rm32/EAX    .           .             .           .           .               0/imm32           # copy to *EAX
+ 16 #?     # . error-byte(ed, Stdout, msg, 34)
+ 17 #?     68/push  0x34/imm32
+ 18 #?     68/push  "abc"/imm32
+ 19 #?     68/push  Stderr/imm32
+ 20 #?     50/push-EAX
+ 21 #?     e8/call  error-byte/disp32
+ 22     # automatic test
+ 23     e8/call  run-tests/disp32  # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.
+ 24     # . syscall(exit, Num-test-failures)
+ 25     8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           3/r32/EBX   Num-test-failures/disp32          # copy *Num-test-failures to EBX
+ 26     b8/copy-to-EAX  1/imm32/exit
+ 27     cd/syscall  0x80/imm8
+ 28 
+ 29 # write(out, "Error: "+msg+": "+byte) then stop(ed, 1)
+ 30 error-byte:  # ed : (address exit-descriptor), out : (address buffered-file), msg : (address array byte), n : byte -> <void>
+ 31     # . prolog
+ 32     55/push-EBP
+ 33     89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
+ 34     # write-buffered(out, "Error: ")
+ 35     # . . push args
+ 36     68/push  "Error: "/imm32
+ 37     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0xc/disp8       .                 # push *(EBP+12)
+ 38     # . . call
+ 39     e8/call  write-buffered/disp32
+ 40     # . . discard args
+ 41     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+ 42     # write-buffered(out, msg)
+ 43     # . . push args
+ 44     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0x10/disp8      .                 # push *(EBP+16)
+ 45     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0xc/disp8       .                 # push *(EBP+12)
+ 46     # . . call
+ 47     e8/call  write-buffered/disp32
+ 48     # . . discard args
+ 49     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+ 50     # write-buffered(out, ": ")
+ 51     # . . push args
+ 52     68/push  ": "/imm32
+ 53     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0xc/disp8       .                 # push *(EBP+12)
+ 54     # . . call
+ 55     e8/call  write-buffered/disp32
+ 56     # . . discard args
+ 57     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+ 58     # print-byte(out, byte)
+ 59     # . . push args
+ 60     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0x14/disp8      .                 # push *(EBP+20)
+ 61     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0xc/disp8       .                 # push *(EBP+12)
+ 62     # . . call
+ 63     e8/call  print-byte/disp32
+ 64     # . . discard args
+ 65     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+ 66     # write-buffered(out, Newline)
+ 67     # . . push args
+ 68     68/push  Newline/imm32
+ 69     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0xc/disp8       .                 # push *(EBP+12)
+ 70     # . . call
+ 71     e8/call  write-buffered/disp32
+ 72     # . . discard args
+ 73     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+ 74     # . flush(out)
+ 75     # . . push args
+ 76     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           0xc/disp8       .                 # push *(EBP+12)
+ 77     # . . call
+ 78     e8/call  flush/disp32
+ 79     # . . discard args
+ 80     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+ 81     # stop(ed, 1)
+ 82     # . . push args
+ 83     68/push  1/imm32
+ 84     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           8/disp8         .                 # push *(EBP+8)
+ 85     # . . call
+ 86     e8/call  stop/disp32
+ 87     # should never get past this point
+ 88 $error-byte:dead-end:
+ 89     # . epilog
+ 90     89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
+ 91     5d/pop-to-EBP
+ 92     c3/return
+ 93 
+ 94 == data
+ 95 
+ 96 # The buffered file for standard error.
+ 97 Stderr:
+ 98     # file descriptor or (address stream)
+ 99     02 00 00 00  # 1 = standard error
+100     # current write index
+101     00 00 00 00
+102     # current read index
+103     00 00 00 00
+104     # length (8)
+105     08 00 00 00
+106     # data
+107     00 00 00 00 00 00 00 00  # 8 bytes
+108 
+109 # TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But
+110 # I don't want to type in 1024 bytes here.
+111 
+112 # . . vim:nowrap:textwidth=0
+
+ + + -- cgit 1.4.1-2-gfad0