Mu - subx/060write-stream.subx

From d1c9392a5461e0d33e226375a8f7986a97d2d66b Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Mon, 26 Nov 2018 01:19:47 -0800 Subject: 4782 --- html/subx/060write-stream.subx.html | 301 ++++++++++++++++++++++++++++++++++++ 1 file changed, 301 insertions(+) create mode 100644 html/subx/060write-stream.subx.html (limited to 'html/subx/060write-stream.subx.html') diff --git a/html/subx/060write-stream.subx.html b/html/subx/060write-stream.subx.html new file mode 100644 index 00000000..90a90fa3 --- /dev/null +++ b/html/subx/060write-stream.subx.html @@ -0,0 +1,301 @@ + + + + +Mu - subx/060write-stream.subx + + + + + + + + + + +
+  1 # write-stream: like write, but write streams rather than strings
+  2 
+  3 == code
+  4 # instruction                     effective address                                                   operand     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 #?   # write-stream(stdout, _test-stream2)
+ 11 #?   68/push  _test-stream2/imm32
+ 12 #?   68/push  1/imm32/stdout
+ 13 #?   e8/call write-stream/disp32
+ 14   # automatic test
+ 15 #?   e8/call test-write-stream-appends/disp32
+ 16   e8/call  run-tests/disp32  # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.
+ 17   # syscall(exit, Num-test-failures)
+ 18   8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           3/r32/EBX   Num-test-failures/disp32          # copy *Num-test-failures to EBX
+ 19   b8/copy-to-EAX  1/imm32
+ 20   cd/syscall  0x80/imm8
+ 21 
+ 22 write-stream:  # f : fd or (address stream), s : (address stream) -> <void>
+ 23   # prolog
+ 24   55/push-EBP
+ 25   89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
+ 26   # if (f < 0x08000000) _write-stream(f, s), return  # f can't be a user-mode address, so treat it as a kernel file descriptor
+ 27   81          7/subop/compare     1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none  .           .           8/disp8         0x08000000/imm32  # compare *(EBP+8)
+ 28   7d/jump-if-greater-or-equal  $write-stream:fake/disp8
+ 29     # push args
+ 30   ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none  .           .           0xc/disp8       .                 # push *(EBP+12)
+ 31   ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none  .           .           8/disp8         .                 # push *(EBP+8)
+ 32     # call
+ 33   e8/call  _write-stream/disp32
+ 34     # discard args
+ 35   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+ 36   eb/jump  $write-stream:end/disp8
+ 37 $write-stream:fake:
+ 38   # otherwise, treat 'f' as a stream to append to
+ 39   # save registers
+ 40   50/push-EAX
+ 41   56/push-ESI
+ 42   57/push-EDI
+ 43   # ESI = f
+ 44   8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none              6/r32/ESI   8/disp8         .                 # copy *(EBP+8) to ESI
+ 45   # EDI = s
+ 46   8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none              7/r32/EDI   0xc/disp8       .                 # copy *(EBP+12) to EDI
+ 47   # EAX = _append-4(&f->data[f->write], &f->data[f->length], &s->data[s->read], &s->data[s->write])
+ 48     # push &s->data[s->write]
+ 49   8b/copy                         0/mod/indirect  7/rm32/EDI    .           .             .           0/r32/EAX   .               .                 # copy *EDI to EAX
+ 50   8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/EDI  0/index/EAX   .           0/r32/EAX   0xc/disp8       .                 # copy EDI+EAX+12 to EAX
+ 51   50/push-EAX
+ 52     # push &s->data[s->read]
+ 53   8b/copy                         1/mod/*+disp8   7/rm32/EDI    .           .             .           0/r32/EAX   4/disp8         .                 # copy *(EDI+4) to EAX
+ 54   8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/EDI  0/index/EAX   .           0/r32/EAX   0xc/disp8       .                 # copy EDI+EAX+12 to EAX
+ 55   50/push-EAX
+ 56     # push &f->data[f->length]
+ 57   8b/copy                         1/mod/*+disp8   6/rm32/ESI    .           .             .           0/r32/EAX   8/disp8         .                 # copy *(ESI+8) to EAX
+ 58   8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/ESI  0/index/EAX   .           0/r32/EAX   0xc/disp8       .                 # copy ESI+EAX+12 to EAX
+ 59   50/push-EAX
+ 60     # push &f->data[f->write]
+ 61   8b/copy                         0/mod/indirect  6/rm32/ESI    .           .             .           0/r32/EAX   .               .                 # copy *ESI to EAX
+ 62   8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/ESI  0/index/EAX   .           0/r32/EAX   0xc/disp8       .                 # copy ESI+EAX+12 to EAX
+ 63   50/push-EAX
+ 64     # call
+ 65   e8/call  _append-4/disp32
+ 66     # discard args
+ 67   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0x10/imm32        # add to ESP
+ 68   # f->write += EAX
+ 69   01/add                          0/mod/indirect  6/rm32/ESI    .           .             .           0/r32/EAX   .               .                 # add EAX to *ESI
+ 70   # s->read += EAX
+ 71   01/add                          1/mod/*+disp8   7/rm32/EDI    .           .             .           0/r32/EAX   4/disp8         .                 # add EAX to *(EDI+4)
+ 72   # restore registers
+ 73   5f/pop-to-EDI
+ 74   5e/pop-to-ESI
+ 75   58/pop-to-EAX
+ 76 $write-stream:end:
+ 77   # epilog
+ 78   89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
+ 79   5d/pop-to-EBP
+ 80   c3/return
+ 81 
+ 82 _write-stream:  # fd : int, s : (address stream) -> <void>
+ 83   # prolog
+ 84   55/push-EBP
+ 85   89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
+ 86   # save registers
+ 87   50/push-EAX
+ 88   51/push-ECX
+ 89   52/push-EDX
+ 90   53/push-EBX
+ 91   56/push-ESI
+ 92   57/push-EDI
+ 93   # ESI = s
+ 94   8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none  .           6/r32/ESI   0xc/disp8       .                 # copy *(EBP+12) to ESI
+ 95   # EDI = s->read
+ 96   8b/copy                         1/mod/*+disp8   6/rm32/ESI    .           .             .           7/r32/EDI   4/disp8         .                 # copy *(ESI+4) to EDI
+ 97   # EDX = s->write
+ 98   8b/copy                         0/mod/indirect  6/rm32/ESI    .           .             .           2/r32/EDX   .               .                 # copy *ESI to EDX
+ 99   # syscall(write, fd, &s->data[s->read], s->write-s->read)
+100     # fd : EBX
+101   8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none  .           3/r32/EBX   8/disp8         .                 # copy *(EBP+8) to EBX
+102     # data : ECX = &s->data[s->read]
+103   8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/ESI  7/index/EDI   .           1/r32/ECX   0xc/disp8       .                 # copy ESI+EDI+12 to ECX
+104     # size : EDX = s->write - s->read
+105   29/subtract                     3/mod/direct    2/rm32/EDX    .           .             .           7/r32/EDI   .               .                 # subtract EDI from EDX
+106     # syscall
+107   b8/copy-to-EAX  4/imm32/write
+108   cd/syscall  0x80/imm8
+109   # restore registers
+110   5f/pop-to-EDI
+111   5e/pop-to-ESI
+112   5b/pop-to-EBX
+113   5a/pop-to-EDX
+114   59/pop-to-ECX
+115   58/pop-to-EAX
+116   # epilog
+117   89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
+118   5d/pop-to-EBP
+119   c3/return
+120 
+121 test-write-stream-single:
+122   # clear-stream(_test-stream)
+123     # push args
+124   68/push  _test-stream/imm32
+125     # call
+126   e8/call  clear-stream/disp32
+127     # discard args
+128   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+129   # clear-stream(_test-stream2)
+130     # push args
+131   68/push  _test-stream2/imm32
+132     # call
+133   e8/call  clear-stream/disp32
+134     # discard args
+135   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+136   # write(_test-stream2, "Ab")
+137     # push args
+138   68/push  "Ab"/imm32
+139   68/push  _test-stream2/imm32
+140     # call
+141   e8/call  write/disp32
+142     # discard args
+143   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+144   # write-stream(_test-stream, _test-stream2)
+145     # push args
+146   68/push  _test-stream2/imm32
+147   68/push  _test-stream/imm32
+148     # call
+149   e8/call  write-stream/disp32
+150     # discard args
+151   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+152   # check-ints-equal(*_test-stream.data, 41/A 62/b 00 00, msg)
+153     # push args
+154   68/push  "F - test-write-stream-single"/imm32
+155   68/push  0x006241/imm32/Ab
+156     # push *_test-stream.data
+157   b8/copy-to-EAX  _test-stream/imm32
+158   ff          6/subop/push        1/mod/*+disp8   0/rm32/EAX    .           .             .           .           0xc/disp8       .                 # push *(EAX+12)
+159     # call
+160   e8/call  check-ints-equal/disp32
+161     # discard args
+162   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
+163   # end
+164   c3/return
+165 
+166 test-write-stream-appends:
+167   # clear-stream(_test-stream)
+168     # push args
+169   68/push  _test-stream/imm32
+170     # call
+171   e8/call  clear-stream/disp32
+172     # discard args
+173   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+174   # clear-stream(_test-stream2)
+175     # push args
+176   68/push  _test-stream2/imm32
+177     # call
+178   e8/call  clear-stream/disp32
+179     # discard args
+180   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+181   # write(_test-stream2, "C")
+182     # push args
+183   68/push  "C"/imm32
+184   68/push  _test-stream2/imm32
+185     # call
+186   e8/call  write/disp32
+187     # discard args
+188   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+189   # write-stream(_test-stream, _test-stream2)
+190     # push args
+191   68/push  _test-stream2/imm32
+192   68/push  _test-stream/imm32
+193     # call
+194   e8/call  write-stream/disp32
+195     # discard args
+196   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+197   # write(_test-stream2, "D")
+198     # push args
+199   68/push  "D"/imm32
+200   68/push  _test-stream2/imm32
+201     # call
+202   e8/call  write/disp32
+203     # discard args
+204   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+205   # write-stream(_test-stream, _test-stream2)
+206     # push args
+207   68/push  _test-stream2/imm32
+208   68/push  _test-stream/imm32
+209     # call
+210   e8/call  write-stream/disp32
+211     # discard args
+212   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+213   # check-ints-equal(*_test-stream.data, 43/C 44/D 00 00, msg)
+214     # push args
+215   68/push  "F - test-write-stream-appends"/imm32
+216   68/push  0x00004443/imm32/C-D
+217     # push *_test-stream.data
+218   b8/copy-to-EAX  _test-stream/imm32
+219   ff          6/subop/push        1/mod/*+disp8   0/rm32/EAX    .           .             .           .           0xc/disp8       .                 # push *(EAX+12)
+220     # call
+221   e8/call  check-ints-equal/disp32
+222     # discard args
+223   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
+224   # end
+225   c3/return
+226 
+227 == data
+228 
+229 _test-stream2:
+230   # current write index
+231   04 00 00 00
+232   # current read index
+233   01 00 00 00
+234   # length (= 8)
+235   08 00 00 00
+236   # data
+237   41 42 43 44 00 00 00 00  # 8 bytes
+238 
+239 # vim:nowrap:textwidth=0
+
+ + + -- cgit 1.4.1-2-gfad0