boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
Log | Files | Refs
commit 380392d8175de35bb9df00c78c176708a7be61dd
parent 5804adb9c84acf6eb8e80dc06626dd3354df8ce5
Author: Ryan Sepassi <rsepassi@gmail.com>
Date:   Tue, 21 Apr 2026 08:59:08 -0700

rm kaem

Diffstat:

MREADME.md | 5++---


Dsrc/kaem-minimal.M1 | 1313-------------------------------------------------------------------------------


Dtests/kaem.run | 3---


3 files changed, 2 insertions(+), 1319 deletions(-)

diff --git a/README.md b/README.md
@@ -17,11 +17,10 @@ C source.
 ## Layout
 
 ```
-docs/                 design docs (PLAN, SEED, P1, C1, LISP)
-src/                  real programs (lisp.M1, kaem-minimal.M1) + p1_gen.py
+docs/                 design docs (PLAN, SEED, P1, LISP)
+src/                  real programs (lisp.M1) + p1_gen.py
 tests/                smoke programs (hello.M1, demo.M1) + fixtures
     lisp/             lisp test fixtures (*.scm + *.expected)
-    kaem.run          smoke input for kaem-minimal
 bootstrap.sh          hex0-seed → M0/hex2-0/catm toolchain build
 populate-upstream.sh  host-side copy of upstream seeds + sources into build/upstream/
 lint.sh               M1 undefined-token guard
diff --git a/src/kaem-minimal.M1 b/src/kaem-minimal.M1
@@ -1,1313 +0,0 @@
-## kaem-minimal.M1 — P1 port of stage0-posix's kaem-minimal.
-##
-## Line-oriented shell: for each non-blank, non-comment line, tokenize
-## and clone+execve+wait4. Aborts on non-zero child status.
-##
-## Grammar (matches stage0-posix/High Level Prototypes/kaem-minimal.c):
-##   ' ' / '\t'    → token separator
-##   '\n'          → end of command
-##   '#'           → rest of line is a comment
-##   '"..."'       → raw string; newlines, #, spaces kept literal
-##   '\\<c>'       → drops backslash and the following char, ends token
-##
-## Usage:
-##   kaem-minimal [script]          (default: kaem.run)
-##
-## Deviations from full kaem: no ${VAR} expansion, no VAR=value envars,
-## no PATH search, no builtins (cd/echo/set/exec/if/…), no pipes, no
-## redirection. "Read a line, exec it, check status" — enough to drive
-## the P1 build pipeline in place of `sh -ec '…'`.
-##
-## Syscall surface (8): read, write, close, exit, openat, clone, execve,
-## waitid. Uses openat(AT_FDCWD, …) because `open` is amd64-only; uses
-## clone(SIGCHLD) instead of fork and waitid instead of wait4 because
-## aarch64/riscv64 don't expose fork/wait4 in the asm-generic table.
-##
-## Buffers live in the single PT_LOAD segment (flags=7 = RWX), zero-
-## filled at build time — the ELF loader maps them into writable pages.
-
-
-## ---- _start ----------------------------------------------------------
-## argv/envp walk on entry: kernel layout at sp is
-##   [sp+0]        argc
-##   [sp+8..]      argv[0..argc-1], then NULL
-##   [after]       envp[0..k-1], then NULL
-## So envp = sp + 8*(argc+2).
-:_start
-    P1_MOV_R3_SP
-    P1_LD_R0_R3_0                   ## r0 = argc
-
-    ## envp = sp + 8*(argc+2). Save for execve later.
-    P1_ADDI_R1_R0_2
-    P1_SHLI_R1_R1_3
-    P1_ADD_R2_R3_R1                 ## r2 = envp pointer
-    P1_LI_R1
-    &envp_ptr
-    P1_ST_R2_R1_0
-
-    ## filename = argc>=2 ? argv[1] : "kaem.run"
-    P1_LI_R1
-    '02000000'
-    P1_LI_BR
-    &_start_default_script
-    P1_BLT_R0_R1                    ## argc < 2 → default
-    P1_LD_R2_R3_16                  ## r2 = argv[1]
-    P1_LI_BR
-    &_start_open_script
-    P1_B
-
-:_start_default_script
-    P1_LI_R2
-    &default_filename
-
-:_start_open_script
-    ## openat(AT_FDCWD=-100, path=r2, flags=O_RDONLY=0, mode=0)
-    ## LI zero-extends, but the kernel reads dirfd as int32 — low 32
-    ## bits 0xFFFFFF9C decode as -100 on all three arches.
-    P1_LI_R0
-    SYS_OPENAT
-    P1_LI_R1
-    '9CFFFFFF'
-    P1_LI_R3
-    '00000000'
-    P1_LI_R4
-    '00000000'
-    P1_SYSCALL                      ## r0 = fd or <0 errno
-
-    ## fd < 0 → openfail
-    P1_LI_R1
-    '00000000'
-    P1_LI_BR
-    &_start_openfail
-    P1_BLT_R0_R1
-
-    ## Slurp the whole file into read_buf.
-    P1_LI_R1
-    &script_fd
-    P1_ST_R0_R1_0                   ## stash fd so we can close after read
-
-    P1_MOV_R1_R0                    ## r1 = fd
-    P1_LI_R2
-    &read_buf                       ## r2 = buf
-    P1_LI_R3
-    &read_buf_end
-    P1_SUB_R3_R3_R2                 ## r3 = capacity
-    P1_LI_BR
-    &read_file_all
-    P1_CALL                         ## r0 = bytes_read
-
-    P1_LI_R1
-    &src_len
-    P1_ST_R0_R1_0
-    P1_LI_R1
-    &src_pos
-    P1_LI_R2
-    '00000000'
-    P1_ST_R2_R1_0
-
-    ## close(fd)
-    P1_LI_R0
-    SYS_CLOSE
-    P1_LI_R1
-    &script_fd
-    P1_LD_R1_R1_0
-    P1_SYSCALL
-
-:_start_loop
-    ## Per-command reset.
-    P1_LI_R1
-    &token_count
-    P1_LI_R2
-    '00000000'
-    P1_ST_R2_R1_0
-    P1_LI_R1
-    &token_arena_next
-    P1_LI_R2
-    &token_arena
-    P1_ST_R2_R1_0
-    P1_LI_R1
-    &current_token_ptr
-    P1_LI_R2
-    '00000000'
-    P1_ST_R2_R1_0
-
-    ## Peek first; EOF → done.
-    P1_LI_BR
-    &peek_char
-    P1_CALL
-    P1_LI_R1
-    '00000000'
-    P1_ADDI_R1_R1_NEG1
-    P1_LI_BR
-    &_start_done
-    P1_BEQ_R0_R1
-
-    ## Tokenize one logical command (until '\n' or EOF).
-    P1_LI_BR
-    &collect_command
-    P1_CALL
-
-    ## No tokens → blank or all-comment line; skip spawn.
-    P1_LI_R1
-    &token_count
-    P1_LD_R1_R1_0
-    P1_LI_R2
-    '00000000'
-    P1_LI_BR
-    &_start_loop
-    P1_BEQ_R1_R2
-
-    P1_LI_BR
-    &emit_verbose
-    P1_CALL
-
-    P1_LI_BR
-    &spawn_and_wait
-    P1_CALL
-
-    P1_LI_BR
-    &_start_loop
-    P1_B
-
-:_start_done
-    P1_LI_R0
-    SYS_EXIT
-    P1_LI_R1
-    '00000000'
-    P1_SYSCALL
-
-:_start_openfail
-    P1_LI_R0
-    SYS_WRITE
-    P1_LI_R1
-    '02000000'
-    P1_LI_R2
-    &msg_openfail
-    P1_LI_R3
-    &msg_openfail_end
-    P1_SUB_R3_R3_R2
-    P1_SYSCALL
-    P1_LI_R0
-    SYS_EXIT
-    P1_LI_R1
-    '01000000'
-    P1_SYSCALL
-
-
-## ---- read_file_all(r1=fd, r2=buf, r3=cap) -> r0 = total_bytes ------
-## Read loop. r4-r7 are callee-saved AND preserved across SYSCALL, so
-## we can park state there across each read() call. No PROLOGUE needed:
-## we only issue syscalls, never CALL.
-:read_file_all
-    P1_MOV_R4_R1                    ## r4 = fd
-    P1_MOV_R5_R2                    ## r5 = cur buf ptr
-    P1_MOV_R6_R3                    ## r6 = remaining capacity
-    P1_LI_R7
-    '00000000'                      ## r7 = total_read
-
-:read_file_all_loop
-    ## Capacity exhausted → stop (caller already sized generously).
-    P1_LI_R1
-    '00000000'
-    P1_LI_BR
-    &read_file_all_done
-    P1_BEQ_R6_R1
-
-    P1_LI_R0
-    SYS_READ
-    P1_MOV_R1_R4
-    P1_MOV_R2_R5
-    P1_MOV_R3_R6
-    P1_SYSCALL                      ## r0 = n (0=EOF, <0=err)
-
-    ## n <= 0 → done. Check < 0 first, then == 0.
-    P1_LI_R1
-    '00000000'
-    P1_LI_BR
-    &read_file_all_done
-    P1_BLT_R0_R1
-    P1_LI_BR
-    &read_file_all_done
-    P1_BEQ_R0_R1
-
-    P1_ADD_R5_R5_R0                 ## buf += n
-    P1_SUB_R6_R6_R0                 ## cap -= n
-    P1_ADD_R7_R7_R0                 ## total += n
-    P1_LI_BR
-    &read_file_all_loop
-    P1_B
-
-:read_file_all_done
-    P1_MOV_R0_R7
-    P1_RET
-
-
-## ---- peek_char() -> r0 = byte (0..255) or -1 on EOF ----------------
-:peek_char
-    P1_LI_R1
-    &src_pos
-    P1_LD_R1_R1_0                   ## r1 = pos
-    P1_LI_R2
-    &src_len
-    P1_LD_R2_R2_0                   ## r2 = len
-    P1_LI_BR
-    &peek_char_inb
-    P1_BLT_R1_R2
-    P1_LI_R0
-    '00000000'
-    P1_ADDI_R0_R0_NEG1
-    P1_RET
-:peek_char_inb
-    P1_LI_R2
-    &read_buf
-    P1_ADD_R2_R2_R1                 ## r2 = &read_buf[pos]
-    P1_LB_R0_R2_0
-    P1_RET
-
-
-## ---- advance_char() — consume current char ------------------------
-:advance_char
-    P1_LI_R1
-    &src_pos
-    P1_LD_R2_R1_0
-    P1_ADDI_R2_R2_1
-    P1_ST_R2_R1_0
-    P1_RET
-
-
-## ---- arena_putc(r1 = byte) ----------------------------------------
-## Append one byte to the token_arena at token_arena_next, bump the
-## cursor. Opens a new token (sets current_token_ptr) if none is open.
-:arena_putc
-    P1_LI_R2
-    &current_token_ptr
-    P1_LD_R3_R2_0                   ## r3 = current_token_ptr
-    P1_LI_R0
-    '00000000'
-    P1_LI_BR
-    &arena_putc_have_open
-    P1_BNE_R3_R0
-    ## No open token — open one: current_token_ptr = token_arena_next.
-    P1_LI_R3
-    &token_arena_next
-    P1_LD_R3_R3_0
-    P1_ST_R3_R2_0
-
-:arena_putc_have_open
-    P1_LI_R2
-    &token_arena_next
-    P1_LD_R3_R2_0                   ## r3 = cursor
-    P1_SB_R1_R3_0                   ## *cursor = byte
-    P1_ADDI_R3_R3_1
-    P1_ST_R3_R2_0                   ## cursor++
-    P1_RET
-
-
-## ---- end_token() — close the currently open token if any ---------
-## Null-terminates the token in arena, records its start ptr in
-## argv_out[token_count], bumps token_count, clears current_token_ptr.
-## No-op if no token is open (e.g. trailing separator).
-:end_token
-    P1_LI_R1
-    &current_token_ptr
-    P1_LD_R2_R1_0                   ## r2 = start ptr (or 0)
-    P1_LI_R3
-    '00000000'
-    P1_LI_BR
-    &end_token_none
-    P1_BEQ_R2_R3
-
-    ## Write NUL to arena[cursor], bump cursor.
-    P1_LI_R1
-    &token_arena_next
-    P1_LD_R3_R1_0                   ## r3 = cursor
-    P1_LI_R0
-    '00000000'
-    P1_SB_R0_R3_0
-    P1_ADDI_R3_R3_1
-    P1_ST_R3_R1_0
-
-    ## argv_out[token_count] = start; token_count++.
-    P1_LI_R1
-    &token_count
-    P1_LD_R3_R1_0                   ## r3 = count
-    P1_SHLI_R0_R3_3                 ## r0 = count*8
-    P1_LI_R1
-    &argv_out
-    P1_ADD_R1_R1_R0                 ## r1 = &argv_out[count]
-    P1_ST_R2_R1_0                   ## store start ptr
-
-    P1_LI_R1
-    &token_count
-    P1_LD_R3_R1_0
-    P1_ADDI_R3_R3_1
-    P1_ST_R3_R1_0                   ## count++
-
-    ## current_token_ptr = 0.
-    P1_LI_R1
-    &current_token_ptr
-    P1_LI_R2
-    '00000000'
-    P1_ST_R2_R1_0
-
-:end_token_none
-    P1_RET
-
-
-## ---- collect_token() — read a plain word into the arena ----------
-## Called when the peek-char is a non-space, non-special, non-quote
-## byte. Consumes chars until a separator/newline/EOF/#/"/\\ and
-## leaves the token open (caller invokes end_token at the dispatch).
-:collect_token
-    P1_PROLOGUE
-:collect_token_loop
-    P1_LI_BR
-    &peek_char
-    P1_CALL                         ## r0 = c
-
-    ## EOF → end of token.
-    P1_LI_R1
-    '00000000'
-    P1_ADDI_R1_R1_NEG1
-    P1_LI_BR
-    &collect_token_done
-    P1_BEQ_R0_R1
-    ## '\n'
-    P1_LI_R1
-    '0A000000'
-    P1_LI_BR
-    &collect_token_done
-    P1_BEQ_R0_R1
-    ## ' '
-    P1_LI_R1
-    '20000000'
-    P1_LI_BR
-    &collect_token_done
-    P1_BEQ_R0_R1
-    ## '\t'
-    P1_LI_R1
-    '09000000'
-    P1_LI_BR
-    &collect_token_done
-    P1_BEQ_R0_R1
-    ## '#' — comment starts mid-token too (kaem-minimal semantics).
-    P1_LI_R1
-    '23000000'
-    P1_LI_BR
-    &collect_token_done
-    P1_BEQ_R0_R1
-    ## '"' — string terminates plain token.
-    P1_LI_R1
-    '22000000'
-    P1_LI_BR
-    &collect_token_done
-    P1_BEQ_R0_R1
-    ## '\\' — also terminates plain token (collect_command handles the
-    ## skip+drop outside).
-    P1_LI_R1
-    '5C000000'
-    P1_LI_BR
-    &collect_token_done
-    P1_BEQ_R0_R1
-
-    ## Otherwise: copy into arena, consume, continue.
-    P1_MOV_R1_R0
-    P1_LI_BR
-    &arena_putc
-    P1_CALL
-    P1_LI_BR
-    &advance_char
-    P1_CALL
-    P1_LI_BR
-    &collect_token_loop
-    P1_B
-
-:collect_token_done
-    P1_EPILOGUE
-    P1_RET
-
-
-## ---- collect_string() — read a "..." raw literal -----------------
-## Enters with the opening '"' still under peek. Consumes it, then
-## copies bytes verbatim into the arena until the closing '"'. The
-## closing quote is consumed. Leaves the token open.
-:collect_string
-    P1_PROLOGUE
-    ## eat opening '"'.
-    P1_LI_BR
-    &advance_char
-    P1_CALL
-
-    ## Ensure the token is opened even for empty strings "" — call
-    ## arena_putc with 0 bytes wouldn't open. Force-open by writing
-    ## then rolling back: simpler path is a direct "open if closed"
-    ## flag, but arena_putc already opens on first call. For empty
-    ## strings we rely on end_token() to skip if no token is open
-    ## (kaem-minimal behavior: empty "" emits no token).
-
-:collect_string_loop
-    P1_LI_BR
-    &peek_char
-    P1_CALL
-    ## EOF mid-string: match kaem-minimal by just stopping (it would
-    ## abort; for our Makefile use this is benign).
-    P1_LI_R1
-    '00000000'
-    P1_ADDI_R1_R1_NEG1
-    P1_LI_BR
-    &collect_string_done
-    P1_BEQ_R0_R1
-    ## closing '"'
-    P1_LI_R1
-    '22000000'
-    P1_LI_BR
-    &collect_string_close
-    P1_BEQ_R0_R1
-
-    ## Any other byte: copy literally.
-    P1_MOV_R1_R0
-    P1_LI_BR
-    &arena_putc
-    P1_CALL
-    P1_LI_BR
-    &advance_char
-    P1_CALL
-    P1_LI_BR
-    &collect_string_loop
-    P1_B
-
-:collect_string_close
-    P1_LI_BR
-    &advance_char
-    P1_CALL                         ## eat closing '"'
-:collect_string_done
-    P1_EPILOGUE
-    P1_RET
-
-
-## ---- collect_comment() — skip '#' through end of line ------------
-## Called with the '#' under peek. Consumes '#' and everything up to
-## but NOT including '\n' (so collect_command's outer loop sees '\n'
-## and terminates the command).
-:collect_comment
-    P1_PROLOGUE
-    P1_LI_BR
-    &advance_char
-    P1_CALL                         ## eat '#'
-:collect_comment_loop
-    P1_LI_BR
-    &peek_char
-    P1_CALL
-    P1_LI_R1
-    '00000000'
-    P1_ADDI_R1_R1_NEG1
-    P1_LI_BR
-    &collect_comment_done
-    P1_BEQ_R0_R1                    ## EOF → done
-    P1_LI_R1
-    '0A000000'
-    P1_LI_BR
-    &collect_comment_done
-    P1_BEQ_R0_R1                    ## '\n' → leave it
-    P1_LI_BR
-    &advance_char
-    P1_CALL
-    P1_LI_BR
-    &collect_comment_loop
-    P1_B
-:collect_comment_done
-    P1_EPILOGUE
-    P1_RET
-
-
-## ---- collect_command() — tokenize one logical line --------------
-## Top of collect_command:
-##   - separator ' ' or '\t' → end_token, advance, continue
-##   - '\n' → end_token, advance, return
-##   - EOF → end_token, return
-##   - '#' → end_token, collect_comment, continue (next iter hits \n)
-##   - '"' → collect_string (keeps token open across quotes)
-##   - '\\' → advance twice (drop \\ and next char), end_token, continue
-##   - else → collect_token (grows token)
-:collect_command
-    P1_PROLOGUE
-:collect_command_loop
-    P1_LI_BR
-    &peek_char
-    P1_CALL                         ## r0 = c
-
-    ## EOF → close any open token and return.
-    P1_LI_R1
-    '00000000'
-    P1_ADDI_R1_R1_NEG1
-    P1_LI_BR
-    &collect_command_done
-    P1_BEQ_R0_R1
-    ## '\n'
-    P1_LI_R1
-    '0A000000'
-    P1_LI_BR
-    &collect_command_eat_nl
-    P1_BEQ_R0_R1
-    ## ' '
-    P1_LI_R1
-    '20000000'
-    P1_LI_BR
-    &collect_command_sep
-    P1_BEQ_R0_R1
-    ## '\t'
-    P1_LI_R1
-    '09000000'
-    P1_LI_BR
-    &collect_command_sep
-    P1_BEQ_R0_R1
-    ## '#'
-    P1_LI_R1
-    '23000000'
-    P1_LI_BR
-    &collect_command_comment
-    P1_BEQ_R0_R1
-    ## '"'
-    P1_LI_R1
-    '22000000'
-    P1_LI_BR
-    &collect_command_str
-    P1_BEQ_R0_R1
-    ## '\\'
-    P1_LI_R1
-    '5C000000'
-    P1_LI_BR
-    &collect_command_bslash
-    P1_BEQ_R0_R1
-
-    ## Plain char — start/continue a token.
-    P1_LI_BR
-    &collect_token
-    P1_CALL
-    P1_LI_BR
-    &collect_command_loop
-    P1_B
-
-:collect_command_sep
-    P1_LI_BR
-    &end_token
-    P1_CALL
-    P1_LI_BR
-    &advance_char
-    P1_CALL
-    P1_LI_BR
-    &collect_command_loop
-    P1_B
-
-:collect_command_comment
-    P1_LI_BR
-    &end_token
-    P1_CALL
-    P1_LI_BR
-    &collect_comment
-    P1_CALL
-    P1_LI_BR
-    &collect_command_loop
-    P1_B
-
-:collect_command_str
-    P1_LI_BR
-    &collect_string
-    P1_CALL
-    P1_LI_BR
-    &collect_command_loop
-    P1_B
-
-:collect_command_bslash
-    ## Drop the backslash, then drop the next char (if any), then end
-    ## the token. Two advance_chars + end_token, per kaem-minimal.c.
-    P1_LI_BR
-    &advance_char
-    P1_CALL
-    P1_LI_BR
-    &peek_char
-    P1_CALL
-    P1_LI_R1
-    '00000000'
-    P1_ADDI_R1_R1_NEG1
-    P1_LI_BR
-    &collect_command_bslash_end
-    P1_BEQ_R0_R1
-    P1_LI_BR
-    &advance_char
-    P1_CALL
-:collect_command_bslash_end
-    P1_LI_BR
-    &end_token
-    P1_CALL
-    P1_LI_BR
-    &collect_command_loop
-    P1_B
-
-:collect_command_eat_nl
-    P1_LI_BR
-    &end_token
-    P1_CALL
-    P1_LI_BR
-    &advance_char
-    P1_CALL
-
-:collect_command_done
-    P1_LI_BR
-    &end_token
-    P1_CALL
-    P1_EPILOGUE
-    P1_RET
-
-
-## ---- strlen(r1 = cstr) -> r0 = length ---------------------------
-:strlen
-    P1_LI_R0
-    '00000000'
-:strlen_loop
-    P1_ADD_R2_R0_R1
-    P1_LB_R3_R2_0
-    P1_LI_R2
-    '00000000'
-    P1_LI_BR
-    &strlen_done
-    P1_BEQ_R3_R2
-    P1_ADDI_R0_R0_1
-    P1_LI_BR
-    &strlen_loop
-    P1_B
-:strlen_done
-    P1_RET
-
-
-## ---- write_cstr(r1 = cstr, r2 = fd) -----------------------------
-## strlen + one SYS_WRITE. Uses r4 to carry fd, r5 to carry ptr across
-## the strlen CALL (r4/r5 are callee-saved, preserved by strlen).
-:write_cstr
-    P1_PROLOGUE
-    P1_MOV_R4_R2                    ## r4 = fd
-    P1_MOV_R5_R1                    ## r5 = cstr
-    P1_LI_BR
-    &strlen
-    P1_CALL                         ## r0 = len
-
-    P1_MOV_R3_R0                    ## r3 = count
-    P1_MOV_R2_R5                    ## r2 = buf
-    P1_MOV_R1_R4                    ## r1 = fd
-    P1_LI_R0
-    SYS_WRITE
-    P1_SYSCALL
-    P1_EPILOGUE
-    P1_RET
-
-
-## ---- emit_verbose() — print " +> tok1 tok2 ... tokN\n" to fd 1 -
-## Walks argv_out[0..token_count-1], emitting each token preceded by
-## a separator (" +> " before the first, " " before the rest), then
-## a trailing newline.
-:emit_verbose
-    P1_PROLOGUE_N2
-    ## slot1 = i (loop index). slot2 = fd const (not strictly needed
-    ## but cheap to keep).
-    P1_MOV_R3_SP
-    P1_LI_R1
-    '00000000'
-    P1_ST_R1_R3_8                   ## i = 0
-
-    ## " +> " prefix.
-    P1_LI_R0
-    SYS_WRITE
-    P1_LI_R1
-    '01000000'
-    P1_LI_R2
-    &msg_verbose_prefix
-    P1_LI_R3
-    '04000000'
-    P1_SYSCALL
-
-:emit_verbose_loop
-    P1_MOV_R3_SP
-    P1_LD_R1_R3_8                   ## r1 = i
-    P1_LI_R2
-    &token_count
-    P1_LD_R2_R2_0
-    P1_LI_BR
-    &emit_verbose_done
-    P1_BEQ_R1_R2                    ## i == count → done
-
-    ## If i > 0, write a separating space.
-    P1_LI_R2
-    '00000000'
-    P1_LI_BR
-    &emit_verbose_skip_space
-    P1_BEQ_R1_R2
-    P1_LI_R0
-    SYS_WRITE
-    P1_LI_R1
-    '01000000'
-    P1_LI_R2
-    &msg_space
-    P1_LI_R3
-    '01000000'
-    P1_SYSCALL
-
-:emit_verbose_skip_space
-    ## Write argv_out[i] as a C string.
-    P1_MOV_R3_SP
-    P1_LD_R1_R3_8                   ## r1 = i
-    P1_SHLI_R1_R1_3                 ## r1 = i*8
-    P1_LI_R2
-    &argv_out
-    P1_ADD_R1_R1_R2
-    P1_LD_R1_R1_0                   ## r1 = argv_out[i]
-    P1_LI_R2
-    '01000000'                      ## fd = 1
-    P1_LI_BR
-    &write_cstr
-    P1_CALL
-
-    P1_MOV_R3_SP
-    P1_LD_R1_R3_8
-    P1_ADDI_R1_R1_1
-    P1_ST_R1_R3_8                   ## i++
-    P1_LI_BR
-    &emit_verbose_loop
-    P1_B
-
-:emit_verbose_done
-    ## Trailing newline.
-    P1_LI_R0
-    SYS_WRITE
-    P1_LI_R1
-    '01000000'
-    P1_LI_R2
-    &msg_newline
-    P1_LI_R3
-    '01000000'
-    P1_SYSCALL
-    P1_EPILOGUE_N2
-    P1_RET
-
-
-## ---- spawn_and_wait() — clone + execve + waitid ---------------
-## Builds a NULL-terminated argv in argv_out (the token pointers are
-## already there; just stamp a NULL past the last one). Then:
-##   pid = clone(SIGCHLD, 0, 0, 0, 0)
-##   if pid == 0:
-##     execve(argv_out[0], argv_out, envp); _exit(127)
-##   else:
-##     waitid(P_PID, pid, &siginfo_buf, WEXITED, 0)
-##     if siginfo_buf.si_status byte != 0 → die
-## Uses waitid rather than wait4 because wait4 is not in the generic
-## Linux syscall table that aarch64/riscv64 share (aarch64 #260 is
-## 32-bit-compat only). waitid is uniform: amd64=247, aarch64=95,
-## riscv64=95.
-:spawn_and_wait
-    P1_PROLOGUE
-
-    ## Stamp NULL into argv_out[token_count].
-    P1_LI_R1
-    &token_count
-    P1_LD_R1_R1_0
-    P1_SHLI_R1_R1_3
-    P1_LI_R2
-    &argv_out
-    P1_ADD_R1_R1_R2                 ## r1 = &argv_out[count]
-    P1_LI_R2
-    '00000000'
-    P1_ST_R2_R1_0
-
-    ## clone(flags=SIGCHLD=17, stack=0, ptid=0, ctid=0, tls=0)
-    ## Arg order past arg3 differs slightly across arches (aarch64/
-    ## riscv64 swap tls and ctid relative to amd64) but all args >= 4
-    ## are 0 here so the divergence is benign.
-    P1_LI_R0
-    SYS_CLONE
-    P1_LI_R1
-    '11000000'                      ## SIGCHLD = 17
-    P1_LI_R2
-    '00000000'
-    P1_LI_R3
-    '00000000'
-    P1_LI_R4
-    '00000000'
-    P1_LI_R5
-    '00000000'
-    P1_LI_R6
-    '00000000'
-    P1_SYSCALL                      ## r0 = pid (parent) or 0 (child)
-
-    ## Child?
-    P1_LI_R1
-    '00000000'
-    P1_LI_BR
-    &spawn_child
-    P1_BEQ_R0_R1
-
-    ## Parent: waitid(P_PID=1, pid, &siginfo_buf, WEXITED=4, rusage=0).
-    ## Move pid into r2 before we clobber r0 with the syscall number.
-    P1_MOV_R2_R0                    ## r2 = id = pid
-    P1_LI_R0
-    SYS_WAITID
-    P1_LI_R1
-    '01000000'                      ## idtype = P_PID = 1
-    P1_LI_R3
-    &siginfo_buf                    ## siginfo_t out
-    P1_LI_R4
-    '04000000'                      ## options = WEXITED = 4
-    P1_LI_R5
-    '00000000'                      ## rusage = NULL
-    P1_SYSCALL
-
-    ## Check si_status (32-bit int at siginfo_buf+24). For CLD_EXITED
-    ## it holds the exit code; for CLD_KILLED it holds the signal
-    ## number. Either way we only pass if every byte is 0, and exit
-    ## codes / signal numbers are < 256 so the low byte is sufficient.
-    P1_LI_R1
-    &siginfo_buf
-    P1_LB_R1_R1_24
-    P1_LI_R2
-    '00000000'
-    P1_LI_BR
-    &spawn_ok
-    P1_BEQ_R1_R2
-
-    ## Print abort message to stderr, exit 1.
-    P1_LI_R0
-    SYS_WRITE
-    P1_LI_R1
-    '02000000'
-    P1_LI_R2
-    &msg_abort
-    P1_LI_R3
-    &msg_abort_end
-    P1_SUB_R3_R3_R2
-    P1_SYSCALL
-    P1_LI_R0
-    SYS_EXIT
-    P1_LI_R1
-    '01000000'
-    P1_SYSCALL
-
-:spawn_ok
-    P1_EPILOGUE
-    P1_RET
-
-:spawn_child
-    ## execve(argv_out[0], argv_out, envp)
-    P1_LI_R1
-    &argv_out
-    P1_LD_R1_R1_0                   ## r1 = filename = argv_out[0]
-    P1_LI_R2
-    &argv_out                       ## r2 = argv
-    P1_LI_R3
-    &envp_ptr
-    P1_LD_R3_R3_0                   ## r3 = envp
-    P1_LI_R0
-    SYS_EXECVE
-    P1_SYSCALL
-
-    ## execve returned → failure. exit(127) so the parent's wait4
-    ## sees a non-zero status and aborts.
-    P1_LI_R0
-    SYS_EXIT
-    P1_LI_R1
-    '7F000000'
-    P1_SYSCALL
-
-
-## ====================================================================
-## Constant pool + mutable globals + zero-filled arenas.
-## All live in the single PT_LOAD segment (flags=7 RWX), so the arenas
-## are writable in place.
-## ====================================================================
-
-## ---- Constant strings -----------------------------------------------
-:default_filename
-"kaem.run"
-'00'
-
-:msg_verbose_prefix
-" +> "
-
-:msg_space
-" "
-
-:msg_newline
-"
-"
-
-:msg_openfail
-"kaem: cannot open script
-"
-:msg_openfail_end
-
-:msg_abort
-"Subprocess error
-ABORTING HARD
-"
-:msg_abort_end
-
-
-## ---- Mutable globals (8 bytes each, 8-aligned so LD/ST work) -------
-## Listed after strings so they're likely 8-aligned; if not, the code
-## still accesses them via 8-byte LD/ST which is aligned on amd64 and
-## requires 8-alignment on aarch64/riscv64. See P1.md §"Data alignment".
-## (Per-arch layout is deterministic but not identical; if this trips
-## a #SIGBUS on aarch64, insert a single-byte padding label above.)
-:globals_pad
-'00'
-'00'
-'00'
-'00'
-'00'
-'00'
-'00'
-
-:script_fd
-'0000000000000000'
-
-:envp_ptr
-'0000000000000000'
-
-:src_pos
-'0000000000000000'
-
-:src_len
-'0000000000000000'
-
-:token_count
-'0000000000000000'
-
-:token_arena_next
-'0000000000000000'
-
-:current_token_ptr
-'0000000000000000'
-
-## siginfo_t output buffer for waitid — 128 bytes. si_status (the
-## exit code / signal number) lives at offset 24.
-:siginfo_buf
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-:siginfo_buf_end
-
-
-## ---- argv_out — NULL-terminated C argv for execve ----------------
-## 128 slots × 8 = 1024 bytes. Enough headroom for any realistic
-## command in a build script; kaem.run lines rarely exceed a dozen.
-:argv_out
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-:argv_out_end
-
-
-## ---- token_arena — byte pool for token text --------------------
-## 4096 bytes: far more than any shell line we're likely to emit.
-## Reset on every command; never spills across commands.
-:token_arena
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-:token_arena_end
-
-
-## ---- read_buf — file slurp buffer -------------------------------
-## 16 KiB covers any reasonable build script. At 128 bytes per line
-## this is 128 lines × 32 hex chars.
-:read_buf
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-
-:ELF_end
-
diff --git a/tests/kaem.run b/tests/kaem.run
@@ -1,3 +0,0 @@
-/bin/echo hello
-/bin/echo "world"
-/bin/true