Mu - 091write-int.subx

From 8fa32599bb288f9e51ebcf6f7c00339692c2a5b5 Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Tue, 14 Jan 2020 01:24:54 -0800 Subject: 5889 --- html/091write-int.subx.html | 186 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 186 insertions(+) create mode 100644 html/091write-int.subx.html (limited to 'html/091write-int.subx.html') diff --git a/html/091write-int.subx.html b/html/091write-int.subx.html new file mode 100644 index 00000000..d69537e4 --- /dev/null +++ b/html/091write-int.subx.html @@ -0,0 +1,186 @@ + + + + +Mu - 091write-int.subx + + + + + + + + + + +https://github.com/akkartik/mu/blob/master/091write-int.subx +
+  1 # write-int: add a single int to a stream
+  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 write-int:  # out : (addr stream byte), n : int
+  9     # . prologue
+ 10     55/push-ebp
+ 11     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
+ 12     # . save registers
+ 13     50/push-eax
+ 14     51/push-ecx
+ 15     57/push-edi
+ 16     # edi = out
+ 17     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
+ 18     # ecx = out->write
+ 19     8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           1/r32/ecx   .               .                 # copy *edi to ecx
+ 20     # if (out->write >= out->length) abort
+ 21     3b/compare                      1/mod/*+disp8   7/rm32/edi    .           .             .           1/r32/ecx   8/disp8         .                 # compare ecx with *(edi+8)
+ 22     7d/jump-if-greater-or-equal  $write-int:abort/disp8
+ 23 $write-int:to-stream:
+ 24     # out->data[out->write] = n
+ 25     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           0/r32/eax   0xc/disp8       .                 # copy *(ebp+12) to eax
+ 26     89/copy                         1/mod/*+disp8   4/rm32/sib    7/base/edi  1/index/ecx   .           0/r32/eax   0xc/disp8       .                 # copy eax to *(edi+ecx+12)
+ 27     # out->write += 4
+ 28     81          0/subop/add         0/mod/indirect  7/rm32/edi    .           .             .           .           .               4/imm32           # add to *edi
+ 29 $write-int:end:
+ 30     # . restore registers
+ 31     5f/pop-to-edi
+ 32     59/pop-to-ecx
+ 33     58/pop-to-eax
+ 34     # . epilogue
+ 35     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
+ 36     5d/pop-to-ebp
+ 37     c3/return
+ 38 
+ 39 $write-int:abort:
+ 40     # . _write(2/stderr, error)
+ 41     # . . push args
+ 42     68/push  "write-int: out of space\n"/imm32
+ 43     68/push  2/imm32/stderr
+ 44     # . . call
+ 45     e8/call  _write/disp32
+ 46     # . . discard args
+ 47     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+ 48     # . syscall(exit, 1)
+ 49     bb/copy-to-ebx  1/imm32
+ 50     b8/copy-to-eax  1/imm32/exit
+ 51     cd/syscall  0x80/imm8
+ 52     # never gets here
+ 53 
+ 54 test-write-int-single:
+ 55     # - check that write-int writes to first int of 'stream'
+ 56     # setup
+ 57     # . clear-stream(_test-stream)
+ 58     # . . push args
+ 59     68/push  _test-stream/imm32
+ 60     # . . call
+ 61     e8/call  clear-stream/disp32
+ 62     # . . discard args
+ 63     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+ 64     # write-int(_test-stream, "abcd")
+ 65     # . . push args
+ 66     68/push  0x64636261/imm32
+ 67     68/push  _test-stream/imm32
+ 68     # . . call
+ 69     e8/call  write-int/disp32
+ 70     # . . discard args
+ 71     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+ 72     # check-stream-equal(_test-stream, "abcd", msg)
+ 73     # . . push args
+ 74     68/push  "F - test-write-int-single"/imm32
+ 75     68/push  "abcd"/imm32
+ 76     68/push  _test-stream/imm32
+ 77     # . . call
+ 78     e8/call  check-stream-equal/disp32
+ 79     # . . discard args
+ 80     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+ 81     # . end
+ 82     c3/return
+ 83 
+ 84 test-write-byte-buffered-multiple:
+ 85     # - check that write-int correctly appends multiple writes
+ 86     # setup
+ 87     # . clear-stream(_test-stream)
+ 88     # . . push args
+ 89     68/push  _test-stream/imm32
+ 90     # . . call
+ 91     e8/call  clear-stream/disp32
+ 92     # . . discard args
+ 93     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+ 94     # write-int(_test-stream, "abcd")
+ 95     # . . push args
+ 96     68/push  0x64636261/imm32
+ 97     68/push  _test-stream/imm32
+ 98     # . . call
+ 99     e8/call  write-int/disp32
+100     # . . discard args
+101     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+102     # write-int(_test-stream, "efgh")
+103     # . . push args
+104     68/push  0x68676665/imm32
+105     68/push  _test-stream/imm32
+106     # . . call
+107     e8/call  write-int/disp32
+108     # . . discard args
+109     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+110     # check-stream-equal(_test-stream, "abcdefgh", msg)
+111     # . . push args
+112     68/push  "F - test-write-byte-buffered-multiple"/imm32
+113     68/push  "abcdefgh"/imm32
+114     68/push  _test-stream/imm32
+115     # . . call
+116     e8/call  check-stream-equal/disp32
+117     # . . discard args
+118     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+119     # . end
+120     c3/return
+121 
+122 # . . vim:nowrap:textwidth=0
+
+ + + -- cgit 1.4.1-2-gfad0