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author | Kartik K. Agaram <vc@akkartik.com> | 2021-03-03 22:09:50 -0800 |
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committer | Kartik K. Agaram <vc@akkartik.com> | 2021-03-03 22:21:03 -0800 |
commit | 71e4f3812982dba2efb471283d310224e8db363e (patch) | |
tree | ea111a1acb8b8845dbda39c0e1b4bac1d198143b /303kernel-string.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 '303kernel-string.subx')
-rw-r--r-- | 303kernel-string.subx | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/303kernel-string.subx b/303kernel-string.subx deleted file mode 100644 index 13472cb0..00000000 --- a/303kernel-string.subx +++ /dev/null @@ -1,91 +0,0 @@ -# We can't really do much with null-terminated kernel strings, and we don't -# want to. Let's turn them into regular length-prefixed strings at the first -# opportunity. - -== code - -kernel-string-to-string: # ad: (addr allocation-descriptor), in: (addr kernel-string), out: (addr handle array byte) - # . prologue - 55/push-ebp - 89/<- %ebp 4/r32/esp - # . save registers - 51/push-ecx - 52/push-edx - 53/push-ebx - 56/push-esi - 57/push-edi - # var len/ecx: int = length(in) - (kernel-string-length *(ebp+0xc)) - 89/<- %ecx 0/r32/eax - # result = allocate-array(ad, len) - (allocate-array *(ebp+8) %ecx *(ebp+0x10)) - # var c/edx: byte = 0 - ba/copy-to-edx 0/imm32 - # var src/esi: (addr byte) = in - 8b/-> *(ebp+0xc) 6/r32/esi - # var dest/edi: (addr byte) = result->data - 8b/-> *(ebp+0x10) 7/r32/edi - (lookup *edi *(edi+4)) # => eax - 8d/copy-address *(eax+4) 7/r32/edi - { -$kernel-string-to-string:loop: - # c = *src - 8a/byte-> *esi 2/r32/dl - # if (c == 0) break - 81 7/subop/compare %edx 0/imm32 - 74/jump-if-= break/disp8 - # *dest = c - 88/byte<- *edi 2/r32/dl - # ++src - 46/increment-esi - # ++dest - 47/increment-edi - eb/jump loop/disp8 - } -$kernel-string-to-string:end: - # . restore registers - 5f/pop-to-edi - 5e/pop-to-esi - 5b/pop-to-ebx - 5a/pop-to-edx - 59/pop-to-ecx - # . epilogue - 89/<- %esp 5/r32/ebp - 5d/pop-to-ebp - c3/return - -kernel-string-length: # in: (addr kernel-string) -> result/eax: int - # . prologue - 55/push-ebp - 89/<- %ebp 4/r32/esp - # . save registers - 51/push-ecx - 52/push-edx - # result = 0 - b8/copy-to-eax 0/imm32 - # var c/ecx: byte = 0 - b9/copy-to-ecx 0/imm32 - # var curr/edx: (addr byte) = in - 8b/-> *(ebp+8) 2/r32/edx - { -$kernel-string-length:loop: - # c = *curr - 8a/byte-> *edx 1/r32/ecx - # if (c == 0) break - 81 7/subop/compare %ecx 0/imm32 - 74/jump-if-= break/disp8 - # ++curr - 42/increment-edx - # ++result - 40/increment-eax - # - eb/jump loop/disp8 - } -$kernel-string-length:end: - # . restore registers - 5a/pop-to-edx - 59/pop-to-ecx - # . epilogue - 89/<- %esp 5/r32/ebp - 5d/pop-to-ebp - c3/return |