313 lines
17 KiB
Plaintext
313 lines
17 KiB
Plaintext
# write: write to in-memory streams
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#
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# We need to do this in machine code because streams need to be opaque types,
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# and we don't yet support opaque types in Mu.
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== code
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# instruction effective address register displacement immediate
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# . op subop mod rm32 base index scale r32
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# . 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
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write: # f: (addr stream byte), s: (addr array byte)
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# if (s == 0) return
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81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 0/imm32 # compare *(ebp+12)
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74/jump-if-= $write:end/disp8
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# . save registers
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50/push-eax
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51/push-ecx
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52/push-edx
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53/push-ebx
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# ecx = f
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 8/disp8 . # copy *(ebp+8) to ecx
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# edx = f->write
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8b/copy 0/mod/indirect 1/rm32/ecx . . . 2/r32/edx . . # copy *ecx to edx
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# ebx = f->size
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8b/copy 1/mod/*+disp8 1/rm32/ecx . . . 3/r32/ebx 8/disp8 . # copy *(ecx+8) to ebx
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# eax = _append-3(&f->data[f->write], &f->data[f->size], s)
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# . . push s
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
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# . . push &f->data[f->size]
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8d/copy-address 1/mod/*+disp8 4/rm32/sib 1/base/ecx 3/index/ebx . 3/r32/ebx 0xc/disp8 . # copy ecx+ebx+12 to ebx
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53/push-ebx
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# . . push &f->data[f->write]
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8d/copy-address 1/mod/*+disp8 4/rm32/sib 1/base/ecx 2/index/edx . 3/r32/ebx 0xc/disp8 . # copy ecx+edx+12 to ebx
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53/push-ebx
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# . . call
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e8/call _append-3/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# f->write += eax
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01/add 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # add eax to *ecx
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# . restore registers
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5b/pop-to-ebx
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5a/pop-to-edx
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59/pop-to-ecx
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58/pop-to-eax
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$write:end:
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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test-write-single:
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# clear-stream(_test-stream)
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# . . push args
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68/push _test-stream/imm32
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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# write(_test-stream, "Ab")
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# . . push args
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68/push "Ab"/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# check-ints-equal(*_test-stream->data, 41/A 62/b 00 00, msg)
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# . . push args
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68/push "F - test-write-single"/imm32
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68/push 0x006241/imm32/Ab
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# . . push *_test-stream->data
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b8/copy-to-eax _test-stream/imm32
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ff 6/subop/push 1/mod/*+disp8 0/rm32/eax . . . . 0xc/disp8 . # push *(eax+12)
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# end
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c3/return
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test-write-appends:
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# clear-stream(_test-stream)
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# . . push args
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68/push _test-stream/imm32
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# . . call
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e8/call clear-stream/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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# write(_test-stream, "C")
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# . . push args
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68/push "C"/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# write(_test-stream, "D")
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# . . push args
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68/push "D"/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# check-ints-equal(*_test-stream->data, 43/C 44/D 00 00, msg)
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# . . push args
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68/push "F - test-write-appends"/imm32
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68/push 0x00004443/imm32/C-D
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# . . push *_test-stream->data
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b8/copy-to-eax _test-stream/imm32
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ff 6/subop/push 1/mod/*+disp8 0/rm32/eax . . . . 0xc/disp8 . # push *(eax+12)
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# . . call
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e8/call check-ints-equal/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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# end
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c3/return
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== data
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_test-stream: # (stream byte)
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# current write index
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0/imm32
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# current read index
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0/imm32
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# size
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0x10/imm32
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# data (2 lines x 8 bytes/line)
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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== code
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try-write: # f: (addr stream byte), s: (addr array byte) -> overflow?/eax: boolean
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# if (s == 0) return
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81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 0/imm32 # compare *(ebp+12)
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74/jump-if-= $try-write:end/disp8
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# . save registers
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51/push-ecx
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# if (f->size - f->write < s->size) return
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# . eax = f->size - f->write - s->size
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 8/disp8 . # copy *(ebp+8) to ecx
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8b/copy 1/mod/*+disp8 1/rm32/ecx . . . 0/r32/eax 8/disp8 . # copy *(ecx+8) to eax
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2b/subtract 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # subtract *ecx from eax
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 0xc/disp8 . # copy *(ebp+12) to ecx
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2b/subtract 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # subtract *ecx from eax
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# . if (eax < 0) return
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3d/compare-eax-and 0/imm32
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7c/jump-if-< $try-write:end/disp8
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# write(f, s)
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# . . push args
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call write/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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# . restore registers
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59/pop-to-ecx
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# return 0
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b8/copy-to-eax 0/imm32
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$try-write:end:
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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# probably a bad idea
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space-remaining-in-stream: # f: (addr stream byte) -> n/eax: int
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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51/push-ecx
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# return f->size - f->write
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 8/disp8 . # copy *(ebp+8) to ecx
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8b/copy 1/mod/*+disp8 1/rm32/ecx . . . 0/r32/eax 8/disp8 . # copy *(ecx+8) to eax
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2b/subtract 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # subtract *ecx from eax
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# . restore registers
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59/pop-to-ecx
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$space-remaining-in-stream:end:
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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stream-size: # f: (addr stream byte) -> n/eax: int
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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51/push-ecx
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# return f->write
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 8/disp8 . # copy *(ebp+8) to ecx
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8b/copy 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # copy *ecx to eax
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# . restore registers
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59/pop-to-ecx
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$stream-size:end:
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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# 3-argument variant of _append
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_append-3: # out: (addr byte), outend: (addr byte), s: (addr array byte) -> num_bytes_appended/eax
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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51/push-ecx
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# if (outend - out < s->size) abort
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# . eax = f->size - f->write - s->size
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 0/r32/eax 0xc/disp8 . # copy *(ebp+12) to eax
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2b/subtract 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 8/disp8 . # subtract *(ebp+8) from eax
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 0x10/disp8 . # copy *(ebp+16) to ecx
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2b/subtract 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # subtract *ecx from eax
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# . if (eax < 0) abort
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3d/compare-eax-and 0/imm32
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7c/jump-if-< $_append-3:abort/disp8
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# eax = _append-4(out, outend, &s->data[0], &s->data[s->size])
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# . . push &s->data[s->size]
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 0/r32/eax 0x10/disp8 . # copy *(ebp+16) to eax
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8b/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy *eax to ecx
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8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/eax 1/index/ecx . 1/r32/ecx 4/disp8 . # copy eax+ecx+4 to ecx
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51/push-ecx
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# . . push &s->data[0]
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8d/copy-address 1/mod/*+disp8 0/rm32/eax . . . 1/r32/ecx 4/disp8 . # copy eax+4 to ecx
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51/push-ecx
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# . . push outend
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
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# . . push out
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ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
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# . . call
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e8/call _append-4/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
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$_append-3:end:
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# . restore registers
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59/pop-to-ecx
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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$_append-3:abort:
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(abort "_append-3 about to overflow") # 3=cyan
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# never gets here
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# 4-argument variant of _append
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_append-4: # out: (addr byte), outend: (addr byte), in: (addr byte), inend: (addr byte) -> num_bytes_appended/eax: int
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# . prologue
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55/push-ebp
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89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
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# . save registers
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51/push-ecx
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52/push-edx
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53/push-ebx
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56/push-esi
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57/push-edi
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# num_bytes_appended = 0
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b8/copy-to-eax 0/imm32
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# edi = out
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 7/r32/edi 8/disp8 . # copy *(ebp+8) to edi
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# edx = outend
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 2/r32/edx 0xc/disp8 . # copy *(ebp+12) to edx
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# esi = in
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 0x10/disp8 . # copy *(ebp+16) to esi
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# ecx = inend
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0x14/disp8 . # copy *(ebp+20) to ecx
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$_append-4:loop:
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# if (in >= inend) break
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39/compare 3/mod/direct 6/rm32/esi . . . 1/r32/ecx . . # compare esi with ecx
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73/jump-if-addr>= $_append-4:end/disp8
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# if (out >= outend) abort # just to catch test failures fast
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39/compare 3/mod/direct 7/rm32/edi . . . 2/r32/edx . . # compare edi with edx
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0f 83/jump-if-addr>= $_append-4:abort/disp32
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# *out = *in
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8a/copy-byte 0/mod/indirect 6/rm32/esi . . . 3/r32/BL . . # copy byte at *esi to BL
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88/copy-byte 0/mod/indirect 7/rm32/edi . . . 3/r32/BL . . # copy byte at BL to *edi
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# ++num_bytes_appended
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40/increment-eax
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# ++in
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46/increment-esi
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# ++out
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47/increment-edi
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eb/jump $_append-4:loop/disp8
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$_append-4:end:
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# . restore registers
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5f/pop-to-edi
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5e/pop-to-esi
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5b/pop-to-ebx
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5a/pop-to-edx
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59/pop-to-ecx
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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$_append-4:abort:
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "_append-4: stream full at " 3 0) # 3=cyan
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(draw-int32-hex-wrapping-right-then-down-from-cursor-over-full-screen 0 %eax 3 0)
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(abort "")
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# never gets here
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# . . vim:nowrap:textwidth=0
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