Mu - subx/062write-stream.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/062write-stream.subx.html | 305 ++++++++++++++++++++++++++++++++++++ 1 file changed, 305 insertions(+) create mode 100644 html/subx/062write-stream.subx.html (limited to 'html/subx/062write-stream.subx.html') diff --git a/html/subx/062write-stream.subx.html b/html/subx/062write-stream.subx.html new file mode 100644 index 00000000..9d88e104 --- /dev/null +++ b/html/subx/062write-stream.subx.html @@ -0,0 +1,305 @@ + + + + +Mu - subx/062write-stream.subx + + + + + + + + + + +https://github.com/akkartik/mu/blob/master/subx/062write-stream.subx +
+  1 # write-stream: like write, but write streams rather than strings
+  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 #?     # 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-single/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/exit
+ 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   5/rm32/EBP    .           .             .           .           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   5/rm32/EBP    .           .             .           .           0xc/disp8       .                 # push *(EBP+12)
+ 31     ff          6/subop/push        1/mod/*+disp8   5/rm32/EBP    .           .             .           .           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     # EDI = f
+ 44     8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .                         7/r32/EDI   8/disp8         .                 # copy *(EBP+8) to EDI
+ 45     # ESI = s
+ 46     8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .                         6/r32/ESI   0xc/disp8       .                 # copy *(EBP+12) to ESI
+ 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  6/rm32/ESI    .           .             .           0/r32/EAX   .               .                 # copy *ESI to EAX
+ 50     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
+ 51     50/push-EAX
+ 52     # . . push &s->data[s->read]
+ 53     8b/copy                         1/mod/*+disp8   6/rm32/ESI    .           .             .           0/r32/EAX   4/disp8         .                 # copy *(ESI+4) to EAX
+ 54     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
+ 55     50/push-EAX
+ 56     # . . push &f->data[f->length]
+ 57     8b/copy                         1/mod/*+disp8   7/rm32/EDI    .           .             .           0/r32/EAX   8/disp8         .                 # copy *(EDI+8) to EAX
+ 58     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
+ 59     50/push-EAX
+ 60     # . . push &f->data[f->write]
+ 61     8b/copy                         0/mod/indirect  7/rm32/EDI    .           .             .           0/r32/EAX   .               .                 # copy *EDI to EAX
+ 62     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
+ 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  7/rm32/EDI    .           .             .           0/r32/EAX   .               .                 # add EAX to *EDI
+ 70     # s->read += EAX
+ 71     01/add                          1/mod/*+disp8   6/rm32/ESI    .           .             .           0/r32/EAX   4/disp8         .                 # add EAX to *(ESI+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   5/rm32/EBP    .           .             .           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   5/rm32/EBP    .           .             .           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     # setup
+123     # . clear-stream(_test-stream)
+124     # . . push args
+125     68/push  _test-stream/imm32
+126     # . . call
+127     e8/call  clear-stream/disp32
+128     # . . discard args
+129     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+130     # . clear-stream(_test-stream2)
+131     # . . push args
+132     68/push  _test-stream2/imm32
+133     # . . call
+134     e8/call  clear-stream/disp32
+135     # . . discard args
+136     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
+137     # . write(_test-stream2, "Ab")
+138     # . . push args
+139     68/push  "Ab"/imm32
+140     68/push  _test-stream2/imm32
+141     # . . call
+142     e8/call  write/disp32
+143     # . . discard args
+144     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+145     # write-stream(_test-stream, _test-stream2)
+146     # . . push args
+147     68/push  _test-stream2/imm32
+148     68/push  _test-stream/imm32
+149     # . . call
+150     e8/call  write-stream/disp32
+151     # . . discard args
+152     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+153     # check-stream-equal(_test-stream, "Ab", msg)
+154     # . . push args
+155     68/push  "F - test-write-stream-single"/imm32
+156     68/push  "Ab"/imm32
+157     68/push  _test-stream/imm32
+158     # . . call
+159     e8/call  check-stream-equal/disp32
+160     # . . discard args
+161     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
+162     # . end
+163     c3/return
+164 
+165 test-write-stream-appends:
+166     # setup
+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     # first write
+190     # . write-stream(_test-stream, _test-stream2)
+191     # . . push args
+192     68/push  _test-stream2/imm32
+193     68/push  _test-stream/imm32
+194     # . . call
+195     e8/call  write-stream/disp32
+196     # . . discard args
+197     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+198     # second write
+199     # . write(_test-stream2, "D")
+200     # . . push args
+201     68/push  "D"/imm32
+202     68/push  _test-stream2/imm32
+203     # . . call
+204     e8/call  write/disp32
+205     # . . discard args
+206     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+207     # . write-stream(_test-stream, _test-stream2)
+208     # . . push args
+209     68/push  _test-stream2/imm32
+210     68/push  _test-stream/imm32
+211     # . . call
+212     e8/call  write-stream/disp32
+213     # . . discard args
+214     81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
+215     # check-stream-equal(_test-stream, "CD", msg)
+216     # . . push args
+217     68/push  "F - test-write-stream-appends"/imm32
+218     68/push  "CD"/imm32
+219     68/push  _test-stream/imm32
+220     # . . call
+221     e8/call  check-stream-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