256 lines
13 KiB
Plaintext
256 lines
13 KiB
Plaintext
# write-stream: like write, but write streams rather than strings
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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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#? Entry: # manual test
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#? # write-stream(stdout, _test-stream2)
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#? 68/push _test-stream2/imm32
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#? 68/push 1/imm32/stdout
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#? e8/call write-stream/disp32
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#? # syscall(exit, Num-test-failures)
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#? 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/ebx Num-test-failures/disp32 # copy *Num-test-failures to ebx
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#? b8/copy-to-eax 1/imm32/exit
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#? cd/syscall 0x80/imm8
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write-stream: # f : fd or (addr stream byte), s : (addr stream 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 (f < 0x08000000) _write-stream(f, s), return # f can't be a user-mode address, so treat it as a kernel file descriptor
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81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 0x08000000/imm32 # compare *(ebp+8)
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73/jump-if-greater-unsigned-or-equal $write-stream:fake/disp8
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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-stream/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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eb/jump $write-stream:end/disp8
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$write-stream:fake:
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# otherwise, treat 'f' as a stream to append to
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# . save registers
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50/push-eax
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56/push-esi
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57/push-edi
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# edi = f
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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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# esi = s
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . 6/r32/esi 0xc/disp8 . # copy *(ebp+12) to esi
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# eax = _append-4(&f->data[f->write], &f->data[f->length], &s->data[s->read], &s->data[s->write])
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# . . push &s->data[s->write]
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8b/copy 0/mod/indirect 6/rm32/esi . . . 0/r32/eax . . # copy *esi to eax
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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
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50/push-eax
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# . . push &s->data[s->read]
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8b/copy 1/mod/*+disp8 6/rm32/esi . . . 0/r32/eax 4/disp8 . # copy *(esi+4) to eax
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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
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50/push-eax
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# . . push &f->data[f->length]
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8b/copy 1/mod/*+disp8 7/rm32/edi . . . 0/r32/eax 8/disp8 . # copy *(edi+8) to eax
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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
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50/push-eax
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# . . push &f->data[f->write]
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8b/copy 0/mod/indirect 7/rm32/edi . . . 0/r32/eax . . # copy *edi to eax
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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
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50/push-eax
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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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# f->write += eax
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01/add 0/mod/indirect 7/rm32/edi . . . 0/r32/eax . . # add eax to *edi
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# s->read += eax
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01/add 1/mod/*+disp8 6/rm32/esi . . . 0/r32/eax 4/disp8 . # add eax to *(esi+4)
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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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58/pop-to-eax
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$write-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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_write-stream: # fd : int, s : (addr stream 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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# . 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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56/push-esi
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57/push-edi
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# esi = s
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 0xc/disp8 . # copy *(ebp+12) to esi
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# edi = s->read
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8b/copy 1/mod/*+disp8 6/rm32/esi . . . 7/r32/edi 4/disp8 . # copy *(esi+4) to edi
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# edx = s->write
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8b/copy 0/mod/indirect 6/rm32/esi . . . 2/r32/edx . . # copy *esi to edx
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# syscall(write, fd, &s->data[s->read], s->write - s->read)
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# . . fd : ebx
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8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 3/r32/ebx 8/disp8 . # copy *(ebp+8) to ebx
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# . . data : ecx = &s->data[s->read]
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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
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# . . size : edx = s->write - s->read
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29/subtract 3/mod/direct 2/rm32/edx . . . 7/r32/edi . . # subtract edi from edx
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# . . syscall
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b8/copy-to-eax 4/imm32/write
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cd/syscall 0x80/imm8
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# if (eax < 0) abort
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3d/compare-eax-with 0/imm32
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0f 8c/jump-if-lesser $_write-stream:abort/disp32
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# s->read += eax
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01/add 1/mod/*+disp8 6/rm32/esi . . . 0/r32/eax 4/disp8 . # add eax to *(esi+4)
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# . restore registers
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5f/pop-to-edi
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5e/pop-to-esi
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5b/pop-to-ebx
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5a/pop-to-edx
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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c3/return
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$_write-stream:abort:
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# . _write(2/stderr, error)
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# . . push args
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68/push "_write-stream: failed to write to file\n"/imm32
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68/push 2/imm32/stderr
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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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# . syscall(exit, 1)
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bb/copy-to-ebx 1/imm32
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b8/copy-to-eax 1/imm32/exit
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cd/syscall 0x80/imm8
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# never gets here
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test-write-stream-single:
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# setup
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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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# . clear-stream(_test-stream2)
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# . . push args
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68/push _test-stream2/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-stream2, "Ab")
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# . . push args
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68/push "Ab"/imm32
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68/push _test-stream2/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-stream(_test-stream, _test-stream2)
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# . . push args
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68/push _test-stream2/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write-stream/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-stream-equal(_test-stream, "Ab", msg)
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# . . push args
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68/push "F - test-write-stream-single"/imm32
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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 check-stream-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-stream-appends:
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# setup
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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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# . clear-stream(_test-stream2)
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# . . push args
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68/push _test-stream2/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-stream2, "C")
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# . . push args
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68/push "C"/imm32
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68/push _test-stream2/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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# first write
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# . write-stream(_test-stream, _test-stream2)
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# . . push args
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68/push _test-stream2/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write-stream/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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# second write
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# . write(_test-stream2, "D")
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# . . push args
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68/push "D"/imm32
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68/push _test-stream2/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-stream(_test-stream, _test-stream2)
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# . . push args
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68/push _test-stream2/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call write-stream/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-stream-equal(_test-stream, "CD", msg)
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# . . push args
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68/push "F - test-write-stream-appends"/imm32
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68/push "CD"/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call check-stream-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-stream2: # (ref stream byte)
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# current write index
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4/imm32
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# current read index
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1/imm32
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# length
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8/imm32
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# data
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41/A 42/B 43/C 44/D 00 00 00 00 # 8 bytes
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# . . vim:nowrap:textwidth=0
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