Mu - 113write-stream.subx

From ec73ed1230d75deb0f913a32617c9f1e0a5ca640 Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Fri, 10 Jul 2020 23:44:10 -0700 Subject: 6631 --- html/113write-stream.subx.html | 317 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 317 insertions(+) create mode 100644 html/113write-stream.subx.html (limited to 'html/113write-stream.subx.html') diff --git a/html/113write-stream.subx.html b/html/113write-stream.subx.html new file mode 100644 index 00000000..ceeb6bc6 --- /dev/null +++ b/html/113write-stream.subx.html @@ -0,0 +1,317 @@ + + + + +Mu - 113write-stream.subx + + + + + + + + + + +https://github.com/akkartik/mu/blob/master/113write-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 #? Entry:  # manual test
+  9 #?     # write-stream(stdout, _test-stream2)
+ 10 #?     68/push  _test-stream2/imm32
+ 11 #?     68/push  1/imm32/stdout
+ 12 #?     e8/call write-stream/disp32
+ 13 #?     # syscall(exit, Num-test-failures)
+ 14 #?     8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           3/r32/ebx   Num-test-failures/disp32          # copy *Num-test-failures to ebx
+ 15 #?     e8/call  syscall_exit/disp32
+ 16 
+ 17 write-stream:  # f: fd or (addr stream byte), s: (addr stream byte)
+ 18     # . prologue
+ 19     55/push-ebp
+ 20     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
+ 21     # if (f < 0x08000000) _write-stream(f, s), return  # f can't be a user-mode address, so treat it as a kernel file descriptor
+ 22     81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         0x08000000/imm32  # compare *(ebp+8)
+ 23     73/jump-if-addr>=  $write-stream:fake/disp8
+ 24     # . . push args
+ 25     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
+ 26     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         .                 # push *(ebp+8)
+ 27     # . . call
+ 28     e8/call  _write-stream/disp32
+ 29     # . . discard args
+ 30     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+ 31     eb/jump  $write-stream:end/disp8
+ 32 $write-stream:fake:
+ 33     # otherwise, treat 'f' as a stream to append to
+ 34     # . save registers
+ 35     50/push-eax
+ 36     56/push-esi
+ 37     57/push-edi
+ 38     # edi = f
+ 39     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
+ 40     # esi = s
+ 41     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
+ 42     # eax = _append-4(&f->data[f->write], &f->data[f->size], &s->data[s->read], &s->data[s->write])
+ 43     # . . push &s->data[s->write]
+ 44     8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           0/r32/eax   .               .                 # copy *esi to eax
+ 45     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
+ 46     50/push-eax
+ 47     # . . push &s->data[s->read]
+ 48     8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # copy *(esi+4) to eax
+ 49     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
+ 50     50/push-eax
+ 51     # . . push &f->data[f->size]
+ 52     8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           0/r32/eax   8/disp8         .                 # copy *(edi+8) to eax
+ 53     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
+ 54     50/push-eax
+ 55     # . . push &f->data[f->write]
+ 56     8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           0/r32/eax   .               .                 # copy *edi to eax
+ 57     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
+ 58     50/push-eax
+ 59     # . . call
+ 60     e8/call  _append-4/disp32
+ 61     # . . discard args
+ 62     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
+ 63     # f->write += eax
+ 64     01/add                          0/mod/indirect  7/rm32/edi    .           .             .           0/r32/eax   .               .                 # add eax to *edi
+ 65     # s->read += eax
+ 66     01/add                          1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # add eax to *(esi+4)
+ 67     # . restore registers
+ 68     5f/pop-to-edi
+ 69     5e/pop-to-esi
+ 70     58/pop-to-eax
+ 71 $write-stream:end:
+ 72     # . epilogue
+ 73     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
+ 74     5d/pop-to-ebp
+ 75     c3/return
+ 76 
+ 77 _write-stream:  # fd: int, s: (addr stream byte)
+ 78     # . prologue
+ 79     55/push-ebp
+ 80     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
+ 81     # . save registers
+ 82     50/push-eax
+ 83     51/push-ecx
+ 84     52/push-edx
+ 85     53/push-ebx
+ 86     56/push-esi
+ 87     57/push-edi
+ 88     # esi = s
+ 89     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
+ 90     # edi = s->read
+ 91     8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           7/r32/edi   4/disp8         .                 # copy *(esi+4) to edi
+ 92     # edx = s->write
+ 93     8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           2/r32/edx   .               .                 # copy *esi to edx
+ 94     # syscall(write, fd, &s->data[s->read], s->write - s->read)
+ 95     # . . fd: ebx
+ 96     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           3/r32/ebx   8/disp8         .                 # copy *(ebp+8) to ebx
+ 97     # . . data: ecx = &s->data[s->read]
+ 98     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
+ 99     # . . size: edx = s->write - s->read
+100     29/subtract                     3/mod/direct    2/rm32/edx    .           .             .           7/r32/edi   .               .                 # subtract edi from edx
+101     # . . syscall
+102     e8/call  syscall_write/disp32
+103     # if (eax < 0) abort
+104     3d/compare-eax-with  0/imm32
+105     0f 8c/jump-if-<  $_write-stream:abort/disp32
+106     # s->read += eax
+107     01/add                          1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # add eax to *(esi+4)
+108     # . restore registers
+109     5f/pop-to-edi
+110     5e/pop-to-esi
+111     5b/pop-to-ebx
+112     5a/pop-to-edx
+113     59/pop-to-ecx
+114     58/pop-to-eax
+115     # . epilogue
+116     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
+117     5d/pop-to-ebp
+118     c3/return
+119 
+120 $_write-stream:abort:
+121     # . _write(2/stderr, error)
+122     # . . push args
+123     68/push  "_write-stream: failed to write to file\n"/imm32
+124     68/push  2/imm32/stderr
+125     # . . call
+126     e8/call  _write/disp32
+127     # . . discard args
+128     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+129     # . syscall(exit, 1)
+130     bb/copy-to-ebx  1/imm32
+131     e8/call  syscall_exit/disp32
+132     # never gets here
+133 
+134 test-write-stream-single:
+135     # setup
+136     # . clear-stream(_test-stream)
+137     # . . push args
+138     68/push  _test-stream/imm32
+139     # . . call
+140     e8/call  clear-stream/disp32
+141     # . . discard args
+142     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+143     # . clear-stream(_test-stream2)
+144     # . . push args
+145     68/push  _test-stream2/imm32
+146     # . . call
+147     e8/call  clear-stream/disp32
+148     # . . discard args
+149     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+150     # . write(_test-stream2, "Ab")
+151     # . . push args
+152     68/push  "Ab"/imm32
+153     68/push  _test-stream2/imm32
+154     # . . call
+155     e8/call  write/disp32
+156     # . . discard args
+157     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+158     # write-stream(_test-stream, _test-stream2)
+159     # . . push args
+160     68/push  _test-stream2/imm32
+161     68/push  _test-stream/imm32
+162     # . . call
+163     e8/call  write-stream/disp32
+164     # . . discard args
+165     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+166     # check-stream-equal(_test-stream, "Ab", msg)
+167     # . . push args
+168     68/push  "F - test-write-stream-single"/imm32
+169     68/push  "Ab"/imm32
+170     68/push  _test-stream/imm32
+171     # . . call
+172     e8/call  check-stream-equal/disp32
+173     # . . discard args
+174     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+175     # . end
+176     c3/return
+177 
+178 test-write-stream-appends:
+179     # setup
+180     # . clear-stream(_test-stream)
+181     # . . push args
+182     68/push  _test-stream/imm32
+183     # . . call
+184     e8/call  clear-stream/disp32
+185     # . . discard args
+186     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+187     # . clear-stream(_test-stream2)
+188     # . . push args
+189     68/push  _test-stream2/imm32
+190     # . . call
+191     e8/call  clear-stream/disp32
+192     # . . discard args
+193     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+194     # . write(_test-stream2, "C")
+195     # . . push args
+196     68/push  "C"/imm32
+197     68/push  _test-stream2/imm32
+198     # . . call
+199     e8/call  write/disp32
+200     # . . discard args
+201     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+202     # first write
+203     # . write-stream(_test-stream, _test-stream2)
+204     # . . push args
+205     68/push  _test-stream2/imm32
+206     68/push  _test-stream/imm32
+207     # . . call
+208     e8/call  write-stream/disp32
+209     # . . discard args
+210     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+211     # second write
+212     # . write(_test-stream2, "D")
+213     # . . push args
+214     68/push  "D"/imm32
+215     68/push  _test-stream2/imm32
+216     # . . call
+217     e8/call  write/disp32
+218     # . . discard args
+219     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+220     # . write-stream(_test-stream, _test-stream2)
+221     # . . push args
+222     68/push  _test-stream2/imm32
+223     68/push  _test-stream/imm32
+224     # . . call
+225     e8/call  write-stream/disp32
+226     # . . discard args
+227     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+228     # check-stream-equal(_test-stream, "CD", msg)
+229     # . . push args
+230     68/push  "F - test-write-stream-appends"/imm32
+231     68/push  "CD"/imm32
+232     68/push  _test-stream/imm32
+233     # . . call
+234     e8/call  check-stream-equal/disp32
+235     # . . discard args
+236     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+237     # . end
+238     c3/return
+239 
+240 == data
+241 
+242 _test-stream2:  # (stream byte)
+243     # current write index
+244     4/imm32
+245     # current read index
+246     1/imm32
+247     # size
+248     8/imm32
+249     # data
+250     41/A 42/B 43/C 44/D 00 00 00 00  # 8 bytes
+251 
+252 # . . vim:nowrap:textwidth=0
+
+ + + -- cgit 1.4.1-2-gfad0