boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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boot-build-p1.sh (1387B)

      1 #!/bin/sh
      2 ## boot-build-p1.sh — in-container .P1/.M1 -> ELF.
      3 ##
      4 ## Pure transformation. Caller (the Makefile) ensures every fixed-path
      5 ## input below already exists. Only the variable per-call inputs (source,
      6 ## output binary) come in as args.
      7 ##
      8 ## Pipeline:
      9 ##   cat <P1/P1-$ARCH.M1> <src> -> /tmp/combined.M1
     10 ##   M0   /tmp/combined.M1            -> /tmp/prog.hex2
     11 ##   catm /tmp/elf.hex2 /tmp/prog.hex2 -> /tmp/linked.hex2
     12 ##   hex2-0 /tmp/linked.hex2          -> $OUT
     13 ##
     14 ## Stages through /tmp because the stage0 tools do one syscall per byte;
     15 ## virtiofs round-trips would dominate otherwise.
     16 ##
     17 ## Env: ARCH=aarch64|amd64|riscv64
     18 ## Usage: boot-build-p1.sh <src> <out>
     19 
     20 set -eu
     21 
     22 : "${ARCH:?ARCH must be set}"
     23 [ "$#" -eq 2 ] || { echo "usage: ARCH=<arch> $0 <src> <out>" >&2; exit 2; }
     24 
     25 SRC=$1
     26 OUT=$2
     27 
     28 TABLE=P1/P1-$ARCH.M1
     29 ELF_HDR=vendor/seed/$ARCH/ELF.hex2
     30 TOOLS=build/$ARCH/tools
     31 NAME=$(basename "$SRC" | sed 's/\.[^.]*$//')
     32 WORK=build/$ARCH/.work/$NAME
     33 mkdir -p "$WORK" "$(dirname "$OUT")"
     34 
     35 cat "$TABLE" "$SRC" > /tmp/combined.M1
     36 "$TOOLS/M0" /tmp/combined.M1 /tmp/prog.hex2
     37 
     38 cp "$ELF_HDR" /tmp/elf.hex2
     39 "$TOOLS/catm"   /tmp/linked.hex2 /tmp/elf.hex2 /tmp/prog.hex2
     40 "$TOOLS/hex2-0" /tmp/linked.hex2 /tmp/prog.bin
     41 
     42 cp /tmp/combined.M1 "$WORK/combined.M1"
     43 cp /tmp/prog.hex2   "$WORK/prog.hex2"
     44 cp /tmp/linked.hex2 "$WORK/linked.hex2"
     45 cp /tmp/prog.bin    "$OUT"
     46 chmod 0700 "$OUT"