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 /linux/ex6.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 'linux/ex6.subx')
-rw-r--r-- | linux/ex6.subx | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/linux/ex6.subx b/linux/ex6.subx new file mode 100644 index 00000000..585362f1 --- /dev/null +++ b/linux/ex6.subx @@ -0,0 +1,35 @@ +# Print out a (global variable) string to stdout. +# +# To run: +# $ ./bootstrap translate init.linux apps/ex6.subx -o apps/ex6 +# $ ./bootstrap run apps/ex6 +# Hello, world! + +== code + +# . op subop mod rm32 base index scale r32 +# . 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 + +Entry: + # write(stdout, X, Size) + # . fd = 1 (stdout) + bb/copy-to-ebx 1/imm32 + # . initialize X (location to write result to) + b9/copy-to-ecx X/imm32 + # . initialize Size + 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 2/r32/edx Size/disp32 . # copy *Size to edx + # . syscall + e8/call syscall_write/disp32 + + # exit(ebx) + e8/call syscall_exit/disp32 + +== data + +Size: # size of string + 0x0e/imm32 # 14 +X: # string to print + 48 65 6c 6c 6f 2c 20 77 6f 72 6c 64 21 0a 00 +# H e l l o , ␣ w o r l d ! newline null + +# . . vim:nowrap:textwidth=0 |