97 lines
3.5 KiB
Org Mode
97 lines
3.5 KiB
Org Mode
bootstrappable.org project -*- org -*-
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* What?
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** Full source bootstrapping for GuixSD
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* Why?
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** Reproducibility is essential to Software Freedom
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Reproducible builds are a set of software development practices that
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create a verifiable path from human readable source code to the binary
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code used by computers.
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*** What about the compiler?
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We have the sources: they always lead to bitwise-same binary, but what
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about the compiler?
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*** The current way out: Ignore the problem
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``recipe for yoghurt: add yoghurt to milk''
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*** From the GuixSD manual
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The distribution is fully “bootstrapped” and “self-contained”: each
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package is built based solely on other packages in the distribution.
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The root of this dependency graph is a small set of “bootstrap
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binaries”, provided by the ‘(gnu packages bootstrap)’ module. For more
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information on bootstrapping, *note Bootstrapping::.
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*** New solution: Full source bootstrapping path, Stage0 and Mes
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* How?
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** Software: Stage0 and Mes
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** Stage0
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*** hex.0: amazing ~300 byte self-hosting hex assembler that we consider to be source
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*** a M0 macro assembler written in .0
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*** a M1 macro assembler written in M0
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*** a hex2 linker written in M0
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Look:
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https://git.savannah.nongnu.org/cgit/stage0.git/tree/Linux%20Bootstrap/hex0.hex
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Do:
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git clone https://git.savannah.nongnu.org/git/stage0.git
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cd stage0
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make
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bin/hex < Linux\ Bootstrap/hex0.hex > hex-1
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chmod +x hex-1 # later: bin/exec_enable hex-1
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./hex-1 < Linux\ Bootstrap/hex0.hex > hex-2
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** Mes
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https://gitlab.com/janneke/mes
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*** mes.c: a scheme interpreter prototyped in C ~1400 Lines
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*** mescc.scm: a C compiler written in Scheme (uses Nyacc C99 parser in Scheme)
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*** mes.M1: this scheme interpreter in annotated M1 assembly
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** Naive recipe
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hex + hex.0 => hex-1
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hex-1 + M0.0 -> M0
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M0 + M1.M0 -> M1.0
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M0 + hex2_linker.M0 -> hex2_linker
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M1 + mes.M1 -> mes.hex2
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hex2_linker + stage0/elf32-header.hex2 + mes.hex2 + elf32-footer.hex2 -> mes
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mes + mescc.scm + tcc.c -> tcc.M1 -> tcc.hex2 -> mes-tcc
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mes-tcc + gcc.c -> gcc *done*
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** Less naive recipe
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*** Use hex2_linker, M1 prototyped in C from
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https://github.com/oriansj/mescc-tools
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*** Remember that mes.M1 is compiled by mescc from prototyped src/mes.c in C.
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*** stage0/mescc-tools: TODO
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*** Mes
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M1 -f stage0/x86.M1 -f mlibc/crt1.M1 --LittleEndian --Architecture=1 > mlibc/crt1.hex2
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M1 -f stage0/x86.M1 -f mlibc/mini-libc-mes.M1 --LittleEndian --Architecture=1 > mlibc/libc-mes.hex2
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M1 -f stage0/x86.M1 -f src/mes.M1 --LittleEndian --Architecture=1 > src/mes.hex2
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hex2 --LittleEndian --Architecture=1 --BaseAddress=0x1000000 -f stage0/elf32-header.hex2 -f mlibc/crt1.hex2 -f mlibc/libc-mes.hex2 -f src/mes.hex2 -f stage0/elf32-footer-single-main.hex2 > src/mes-mes
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exec_enable src/mes-mes
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*** Tinycc
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./build.sh
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./link.sh
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* DONE
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** stage0: hex.0, M0 done; M1, hex2_linker prototyped in C
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** tcc compiled with mescc correctly compiles: int main () {return 42;}
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** mes+mescc.scm are mutual self hosting
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** during development we run mescc.scm on Guile (mes is slooowww)
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** tcc compiled with gcc is known to compile gcc
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* TODO
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** fix mescc.scm so that tcc can correctly compile gcc
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** fix bootstrap-loops: (Nyacc?, mes.M1?, psyntax.pp?)
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** make GNU gcc (8.0?) bootstrappable again, remove [need for] tcc stage
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** stage1/2 LISP, FORTH?
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** rain1's LISP compiler?
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** integrate with GuixSD
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** x86_64, arm?
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* Contact
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** #bootstrappable, #guix on freenode
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** bootstrappable.org
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