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authorKartik Agaram <vc@akkartik.com>2020-07-05 12:13:28 -0700
committerKartik Agaram <vc@akkartik.com>2020-07-05 12:13:28 -0700
commitc09c91e185aad8e01b570c2569e13c1e429d2f99 (patch)
tree52a5ae1494ad5b7b2319411815dc45510e761c24 /091write-int.subx
parentf2c5b05374186f9422cfdaf1ada096e39ac91a8b (diff)
downloadmu-c09c91e185aad8e01b570c2569e13c1e429d2f99.tar.gz
6612 - reorganize layers
Diffstat (limited to '091write-int.subx')
-rw-r--r--091write-int.subx121
1 files changed, 0 insertions, 121 deletions
diff --git a/091write-int.subx b/091write-int.subx
deleted file mode 100644
index 97e681c7..00000000
--- a/091write-int.subx
+++ /dev/null
@@ -1,121 +0,0 @@
-# write-int: add (the binary representation of) a single int to a stream
-
-== code
-#   instruction                     effective address                                                   register    displacement    immediate
-# . op          subop               mod             rm32          base        index         scale       r32
-# . 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
-
-write-int:  # out: (addr stream byte), n: int
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # . save registers
-    50/push-eax
-    51/push-ecx
-    57/push-edi
-    # edi = out
-    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
-    # ecx = out->write
-    8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           1/r32/ecx   .               .                 # copy *edi to ecx
-    # if (out->write >= out->size) abort
-    3b/compare                      1/mod/*+disp8   7/rm32/edi    .           .             .           1/r32/ecx   8/disp8         .                 # compare ecx with *(edi+8)
-    7d/jump-if->=  $write-int:abort/disp8
-$write-int:to-stream:
-    # out->data[out->write] = n
-    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           0/r32/eax   0xc/disp8       .                 # copy *(ebp+12) to eax
-    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)
-    # out->write += 4
-    81          0/subop/add         0/mod/indirect  7/rm32/edi    .           .             .           .           .               4/imm32           # add to *edi
-$write-int:end:
-    # . restore registers
-    5f/pop-to-edi
-    59/pop-to-ecx
-    58/pop-to-eax
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-$write-int:abort:
-    # . _write(2/stderr, error)
-    # . . push args
-    68/push  "write-int: out of space\n"/imm32
-    68/push  2/imm32/stderr
-    # . . call
-    e8/call  _write/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # . syscall(exit, 1)
-    bb/copy-to-ebx  1/imm32
-    e8/call  syscall_exit/disp32
-    # never gets here
-
-test-write-int-single:
-    # - check that write-int writes to first int of 'stream'
-    # setup
-    # . clear-stream(_test-stream)
-    # . . push args
-    68/push  _test-stream/imm32
-    # . . call
-    e8/call  clear-stream/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # write-int(_test-stream, "abcd")
-    # . . push args
-    68/push  0x64636261/imm32
-    68/push  _test-stream/imm32
-    # . . call
-    e8/call  write-int/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # check-stream-equal(_test-stream, "abcd", msg)
-    # . . push args
-    68/push  "F - test-write-int-single"/imm32
-    68/push  "abcd"/imm32
-    68/push  _test-stream/imm32
-    # . . call
-    e8/call  check-stream-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . end
-    c3/return
-
-test-write-byte-buffered-multiple:
-    # - check that write-int correctly appends multiple writes
-    # setup
-    # . clear-stream(_test-stream)
-    # . . push args
-    68/push  _test-stream/imm32
-    # . . call
-    e8/call  clear-stream/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # write-int(_test-stream, "abcd")
-    # . . push args
-    68/push  0x64636261/imm32
-    68/push  _test-stream/imm32
-    # . . call
-    e8/call  write-int/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # write-int(_test-stream, "efgh")
-    # . . push args
-    68/push  0x68676665/imm32
-    68/push  _test-stream/imm32
-    # . . call
-    e8/call  write-int/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # check-stream-equal(_test-stream, "abcdefgh", msg)
-    # . . push args
-    68/push  "F - test-write-byte-buffered-multiple"/imm32
-    68/push  "abcdefgh"/imm32
-    68/push  _test-stream/imm32
-    # . . call
-    e8/call  check-stream-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . end
-    c3/return
-
-# . . vim:nowrap:textwidth=0