diff options
| author | Kartik K. Agaram <vc@akkartik.com> | 2021-03-03 22:09:50 -0800 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-03-03 22:21:03 -0800 |
| commit | 71e4f3812982dba2efb471283d310224e8db363e (patch) | |
| tree | ea111a1acb8b8845dbda39c0e1b4bac1d198143b /115write-byte.subx | |
| parent | c6b928be29ac8cdb4e4d6e1eaa20420ff03e5a4c (diff) | |
| download | mu-71e4f3812982dba2efb471283d310224e8db363e.tar.gz | |
7842 - new directory organization
Baremetal is now the default build target and therefore has its sources
at the top-level. Baremetal programs build using the phase-2 Mu toolchain
that requires a Linux kernel. This phase-2 codebase which used to be at
the top-level is now under the linux/ directory. Finally, the phase-2 toolchain,
while self-hosting, has a way to bootstrap from a C implementation, which
is now stored in linux/bootstrap. The bootstrap C implementation uses some
literate programming tools that are now in linux/bootstrap/tools.
So the whole thing has gotten inverted. Each directory should build one
artifact and include the main sources (along with standard library). Tools
used for building it are relegated to sub-directories, even though those
tools are often useful in their own right, and have had lots of interesting
programs written using them.
A couple of things have gotten dropped in this process:
- I had old ways to run on just a Linux kernel, or with a Soso kernel.
No more.
- I had some old tooling for running a single test at the cursor. I haven't
used that lately. Maybe I'll bring it back one day.
The reorg isn't done yet. Still to do:
- redo documentation everywhere. All the README files, all other markdown,
particularly vocabulary.md.
- clean up how-to-run comments at the start of programs everywhere
- rethink what to do with the html/ directory. Do we even want to keep
supporting it?
In spite of these shortcomings, all the scripts at the top-level, linux/
and linux/bootstrap are working. The names of the scripts also feel reasonable.
This is a good milestone to take stock at.
Diffstat (limited to '115write-byte.subx')
| -rw-r--r-- | 115write-byte.subx | 409 |
1 files changed, 7 insertions, 402 deletions
diff --git a/115write-byte.subx b/115write-byte.subx index d38db24c..6935d65b 100644 --- a/115write-byte.subx +++ b/115write-byte.subx @@ -1,28 +1,7 @@ -# write-byte-buffered: add a single byte to a buffered-file. -# flush: write out any buffered writes to disk. +# Write a single byte to a stream. # -# TODO: Come up with a way to signal failure to write to disk. This is hard -# since the failure may impact previous calls that were buffered. - -== data - -# The buffered file for standard output. -Stdout: # buffered-file - # file descriptor or (addr stream byte) - 1/imm32 # standard output -$Stdout->buffer: - # inlined fields for a stream - # current write index - 0/imm32 - # current read index - 0/imm32 - # size - 8/imm32 - # data - 00 00 00 00 00 00 00 00 # 8 bytes - -# TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But -# I don't want to type in 1024 bytes here. +# We need to do this in machine code because streams need to be opaque types, +# and we don't yet support opaque types in Mu. == code # instruction effective address register displacement immediate @@ -30,181 +9,6 @@ $Stdout->buffer: # . 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 lower byte of 'n' to 'f'. -write-byte-buffered: # f: (addr buffered-file), n: int - # . prologue - 55/push-ebp - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp - # . save registers - 51/push-ecx - 57/push-edi - # edi = f - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 7/r32/edi 8/disp8 . # copy *(ebp+8) to edi - # ecx = f->write - 8b/copy 1/mod/*+disp8 7/rm32/edi . . . 1/r32/ecx 4/disp8 . # copy *(edi+4) to ecx - # if (f->write >= f->size) flush and clear f's stream - 3b/compare 1/mod/*+disp8 7/rm32/edi . . . 1/r32/ecx 0xc/disp8 . # compare ecx with *(edi+12) - 7c/jump-if-< $write-byte-buffered:to-stream/disp8 - # . flush(f) - # . . push args - 57/push-edi - # . . call - e8/call flush/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp - # . clear-stream(stream = f+4) - # . . push args - 8d/copy-address 1/mod/*+disp8 7/rm32/edi . . . 0/r32/eax 4/disp8 . # copy edi+4 to eax - 50/push-eax - # . . call - e8/call clear-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp - # . f->write must now be 0; update its cache at ecx - 31/xor 3/mod/direct 1/rm32/ecx . . . 1/r32/ecx . . # clear ecx -$write-byte-buffered:to-stream: - # write to stream - # f->data[f->write] = LSB(n) - 31/xor 3/mod/direct 0/rm32/eax . . . 0/r32/eax . . # clear eax - 8a/copy-byte 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/AL 0xc/disp8 . # copy byte at *(ebp+12) to AL - 88/copy-byte 1/mod/*+disp8 4/rm32/sib 7/base/edi 1/index/ecx . 0/r32/AL 0x10/disp8 . # copy AL to *(edi+ecx+16) - # ++f->write - ff 0/subop/increment 1/mod/*+disp8 7/rm32/edi . . . . 4/disp8 . # increment *(edi+4) -$write-byte-buffered:end: - # . restore registers - 5f/pop-to-edi - 59/pop-to-ecx - # . epilogue - 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp - 5d/pop-to-ebp - c3/return - -flush: # f: (addr buffered-file) - # . prologue - 55/push-ebp - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp - # . save registers - 50/push-eax - 51/push-ecx - # eax = f - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/eax 8/disp8 . # copy *(ebp+8) to eax - # write-stream(f->fd, data = f+4) - # . . push args - 8d/copy-address 1/mod/*+disp8 0/rm32/eax . . . 1/r32/ecx 4/disp8 . # copy eax+4 to ecx - 51/push-ecx - ff 6/subop/push 0/mod/indirect 0/rm32/eax . . . . . . # push *eax - # . . call - e8/call write-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp -$flush:end: - # . restore registers - 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 - -test-write-byte-buffered-single: - # - check that write-byte-buffered writes to first byte of 'file' - # 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 - # . clear-stream($_test-buffered-file->buffer) - # . . push args - 68/push $_test-buffered-file->buffer/imm32 - # . . call - e8/call clear-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp - # write-byte-buffered(_test-buffered-file, 'A') - # . . push args - 68/push 0x41/imm32 - 68/push _test-buffered-file/imm32 - # . . call - e8/call write-byte-buffered/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # flush(_test-buffered-file) - # . . push args - 68/push _test-buffered-file/imm32 - # . . call - e8/call flush/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp - # check-stream-equal(_test-stream, "A", msg) - # . . push args - 68/push "F - test-write-byte-buffered-single"/imm32 - 68/push "A"/imm32 - 68/push _test-stream/imm32 - # . . call - e8/call check-stream-equal/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp - # . end - c3/return - -test-write-byte-buffered-multiple-flushes: - # - check that write-byte-buffered correctly flushes buffered data - # setup - # . clear-stream(_test-stream) - # . . push args - 68/push _test-stream/imm32 - # . . call - e8/call clear-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp - # . clear-stream($_test-buffered-file->buffer) - # . . push args - 68/push $_test-buffered-file->buffer/imm32 - # . . call - e8/call clear-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp - # fill up the buffer for _test-buffered-file - # . write($_test-buffered-file->buffer, "abcdef") - # . . push args - 68/push "abcdef"/imm32 - 68/push $_test-buffered-file->buffer/imm32 - # . . call - e8/call write/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # write-byte-buffered(_test-buffered-file, 'g') - # . . push args - 68/push 0x67/imm32 - 68/push _test-buffered-file/imm32 - # . . call - e8/call write-byte-buffered/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # flush(_test-buffered-file) - # . . push args - 68/push _test-buffered-file/imm32 - # . . call - e8/call flush/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp - # check-stream-equal(_test-stream, "abcdefg", msg) - # . . push args - 68/push "F - test-write-byte-buffered-multiple-flushes"/imm32 - 68/push "abcdefg"/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 - -# - variant without buffering - -# Write lower byte of 'n' to 'f'. append-byte: # f: (addr stream byte), n: int # . prologue 55/push-ebp @@ -239,17 +43,10 @@ $append-byte:end: c3/return $append-byte:abort: - # . _write(2/stderr, error) - # . . push args - 68/push "append-byte: out of space\n"/imm32 - 68/push 2/imm32/stderr - # . . call - e8/call _write/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # . syscall(exit, 1) - bb/copy-to-ebx 1/imm32 - e8/call syscall_exit/disp32 + (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "append-byte: out of space\n" 3 0) # 3=cyan + { + eb/jump loop/disp8 + } # never gets here test-append-byte-single: @@ -282,196 +79,4 @@ test-append-byte-single: # . end c3/return -== data - -_test-output-stream: # (stream byte) - # current write index - 0/imm32 - # current read index - 0/imm32 - # size - 0x800/imm32 # 2048 bytes - # data (128 lines x 16 bytes/line) - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - -# a test buffered file for _test-output-stream -_test-output-buffered-file: # buffered-file - # file descriptor or (addr stream byte) - _test-output-stream/imm32 -$_test-output-buffered-file->buffer: - # current write index - 0/imm32 - # current read index - 0/imm32 - # size - 6/imm32 - # data - 00 00 00 00 00 00 # 6 bytes - -_test-error-stream: # (stream byte) - # current write index - 0/imm32 - # current read index - 0/imm32 - # line - 0x100/imm32 # 256 bytes - # data (16 lines x 16 bytes/line) - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 - -# a test buffered file for _test-error-stream -_test-error-buffered-file: # buffered-file - # file descriptor or (addr stream byte) - _test-error-stream/imm32 -$_test-error-buffered-file->buffer: - # current write index - 0/imm32 - # current read index - 0/imm32 - # size - 6/imm32 - # data - 00 00 00 00 00 00 # 6 bytes - # . . vim:nowrap:textwidth=0 |