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.
2021-03-04 06:09:50 +00:00
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# Write a single byte to a stream.
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2018-12-04 01:08:04 +00:00
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#
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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.
2021-03-04 06:09:50 +00:00
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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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2018-12-04 01:08:04 +00:00
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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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2019-05-03 06:44:43 +00:00
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# Write lower byte of 'n' to 'f'.
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2020-01-27 08:36:44 +00:00
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append-byte: # f: (addr stream byte), n: int
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2019-10-16 02:35:19 +00:00
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# . prologue
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2019-08-26 18:55:26 +00:00
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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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2019-05-03 06:44:43 +00:00
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# . save registers
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2021-02-27 14:55:41 +00:00
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50/push-eax
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2019-08-26 18:55:26 +00:00
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51/push-ecx
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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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# ecx = f->write
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8b/copy 0/mod/indirect 7/rm32/edi . . . 1/r32/ecx . . # copy *edi to ecx
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2020-04-03 19:35:53 +00:00
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# if (f->write >= f->size) abort
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2019-08-26 18:55:26 +00:00
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3b/compare 1/mod/*+disp8 7/rm32/edi . . . 1/r32/ecx 8/disp8 . # compare ecx with *(edi+8)
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2020-01-17 02:31:12 +00:00
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7d/jump-if->= $append-byte:abort/disp8
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2019-05-03 06:44:43 +00:00
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$append-byte:to-stream:
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# write to stream
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# f->data[f->write] = LSB(n)
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2019-08-26 18:55:26 +00:00
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31/xor 3/mod/direct 0/rm32/eax . . . 0/r32/eax . . # clear eax
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8a/copy-byte 1/mod/*+disp8 5/rm32/ebp . . . 0/r32/AL 0xc/disp8 . # copy byte at *(ebp+12) to AL
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88/copy-byte 1/mod/*+disp8 4/rm32/sib 7/base/edi 1/index/ecx . 0/r32/AL 0xc/disp8 . # copy AL to *(edi+ecx+12)
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2019-05-03 06:44:43 +00:00
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# ++f->write
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2019-08-26 18:55:26 +00:00
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ff 0/subop/increment 0/mod/indirect 7/rm32/edi . . . . . . # increment *edi
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2019-05-03 06:44:43 +00:00
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$append-byte:end:
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# . restore registers
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2019-08-26 18:55:26 +00:00
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5f/pop-to-edi
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59/pop-to-ecx
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2021-02-27 14:55:41 +00:00
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58/pop-to-eax
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2019-10-16 02:35:19 +00:00
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# . epilogue
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2019-08-26 18:55:26 +00:00
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89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
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5d/pop-to-ebp
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2019-05-03 06:44:43 +00:00
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c3/return
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$append-byte:abort:
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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.
2021-03-04 06:09:50 +00:00
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(draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 "append-byte: out of space\n" 3 0) # 3=cyan
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{
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eb/jump loop/disp8
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}
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2019-05-03 06:44:43 +00:00
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# never gets here
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test-append-byte-single:
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# - check that append-byte writes to first byte of 'file'
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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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2019-08-26 18:55:26 +00:00
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
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2019-05-03 06:44:43 +00:00
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# append-byte(_test-stream, 'A')
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# . . push args
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68/push 0x41/imm32
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68/push _test-stream/imm32
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# . . call
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e8/call append-byte/disp32
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# . . discard args
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2019-08-26 18:55:26 +00:00
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
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2019-05-03 06:44:43 +00:00
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# check-stream-equal(_test-stream, "A", msg)
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# . . push args
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68/push "F - test-append-byte-single"/imm32
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68/push "A"/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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2019-08-26 18:55:26 +00:00
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81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
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2019-05-03 06:44:43 +00:00
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# . end
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c3/return
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2018-12-04 01:08:04 +00:00
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# . . vim:nowrap:textwidth=0
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