Remove the notion of "sys*"

- This idea originates from very early in the project and was, at the
  time, a very easy way to categorise things.
- Now, it doesn't really make much sense - it is fairly arbitary, often
  occuring when there is a change in kernel, but not from builder-hex0
  to fiwix, and sysb is in reality completely unnecessary.
- In short, the sys* stuff is a bit of a mess that makes the project
  more difficult to understand.
- This puts everything down into one folder and has a manifest file that
  is used to generate the build scripts on the fly rather than using
  coded scripts.
- This is created in the "seed" stage.

stage0-posix -- (calls) --> seed -- (generates) --> main steps

Alongside this change there are a variety of other smaller fixups to the
general structure of the live-bootstrap rootfs.

- Creating a rootfs has become much simpler and is defined as code in
  go.sh. The new structure, for an about-to-be booted system, is

/
-- /steps (direct copy of steps/)
-- /distfiles (direct copy of distfiles/)
-- all files from seed/*
-- all files from seed/stage0-posix/*

- There is no longer such a thing as /usr/include/musl, this didn't
  really make any sense, as musl is the final libc used. Rather, to
  separate musl and mes, we have /usr/include/mes, which is much easier
  to work with.
- This also makes mes easier to blow away later.
- A few things that weren't properly in packages have been changed;
  checksum-transcriber, simple-patch, kexec-fiwix have all been given
  fully qualified package names.
- Highly breaking change, scripts now exist in their package directory
  but NOT WITH THE packagename.sh. Rather, they use pass1.sh, pass2.sh,
  etc. This avoids manual definition of passes.
  - Ditto with patches; default directory is patches, but then any patch
    series specific to a pass are named patches-passX.

steps/musl-1.2.4/files/__stack_chk_fail_local.c

@@ -0,0 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Timo Teräs <timo.teras@iki.fi>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+extern void __stack_chk_fail(void);
+void __attribute__((visibility ("hidden"))) __stack_chk_fail_local(void) { __stack_chk_fail(); }

steps/musl-1.2.4/files/ld-musl-i386.path

@@ -0,0 +1 @@
+/usr/lib/i386-unknown-linux-musl

steps/musl-1.2.4/files/ld-musl-i386.path.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2022 fosslinux <fosslinux@aussies.space>
+
+SPDX-License-Identifier: GPL-3.0-or-later

steps/musl-1.2.4/pass1.sh

@@ -0,0 +1,33 @@
+# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_get() {
+    # Before the last pass the tar file is moved before
+    # the linux build removes all distfiles to save space.
+    if [ -e "../${pkg}.tar.gz" ]; then
+        mkdir "${DISTFILES}"
+        mv "../${pkg}.tar.gz" "${DISTFILES}"
+    else
+        default
+    fi
+}
+
+src_configure() {
+    CC=gcc ./configure \
+        --host=i386-unknown-linux-musl \
+        --disable-shared \
+        --prefix="${PREFIX}" \
+        --libdir="${LIBDIR}" \
+        --includedir="${PREFIX}/include/"
+
+    # configure script creates this file
+    if test -f /dev/null; then
+        rm /dev/null
+        mknod -m 666 /dev/null c 1 3
+    fi
+}
+
+src_compile() {
+    make "${MAKEJOBS}" CROSS_COMPILE=
+}

steps/musl-1.2.4/pass2.sh

@@ -0,0 +1 @@
+pass1.sh

steps/musl-1.2.4/pass3.sh

@@ -0,0 +1,46 @@
+# SPDX-FileCopyrightText: 2022 Dor Askayo <dor.askayo@gmail.com>
+# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
+# SPDX-FileCopyrightText: 2023 fosslinux <fosslinux@aussies.space>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_configure() {
+    ./configure \
+        --host=i386-unknown-linux-musl \
+        --prefix="${PREFIX}" \
+        --libdir="${LIBDIR}" \
+        --includedir="${PREFIX}/include/"
+}
+
+src_compile() {
+    make "${MAKEJOBS}" CROSS_COMPILE=
+}
+
+src_install() {
+    default
+
+    # Make dynamic linker symlink relative in ${PREFIX}/lib
+    rm "${DESTDIR}/lib/ld-musl-i386.so.1"
+    rmdir "${DESTDIR}/lib"
+    mkdir -p "${DESTDIR}${PREFIX}/lib"
+    ln -sr "${DESTDIR}${LIBDIR}/libc.so" "${DESTDIR}${PREFIX}/lib/ld-musl-i386.so.1"
+
+    # Make startup objects available in /usr/lib
+    # Expected by GCC 10+
+    for i in crt1.o crti.o crtn.o Scrt1.o rcrt1.o; do
+        ln -sr "${DESTDIR}${LIBDIR}/${i}" "${DESTDIR}${PREFIX}/lib/${i}"
+    done
+
+    # Add symlink for ldd
+    mkdir -p "${DESTDIR}${PREFIX}/bin"
+    ln -s ../lib/ld-musl-i386.so.1 "${DESTDIR}${PREFIX}/bin/ldd"
+
+    # Add library search path configurtion
+    mkdir -p "${DESTDIR}/etc"
+    cp ld-musl-i386.path "${DESTDIR}/etc"
+}
+
+src_postprocess() {
+    # Stripping libc can cause some strange brokenness
+    :
+}

steps/musl-1.2.4/patches-pass3

@@ -0,0 +1 @@
+patches-pass2

steps/musl-1.2.4/patches/avoid_set_thread_area.patch

@@ -0,0 +1,50 @@
+# SPDX-FileCopyrightText: 2023 Richard Masters <grick23@gmail.com>
+# SPDX-License-Identifier: MIT
+diff -r -u musl-1.2.3.orig/arch/i386/pthread_arch.h musl-1.2.3/arch/i386/pthread_arch.h
+--- arch/i386/pthread_arch.h	2022-04-07 17:12:40.000000000 +0000
++++ arch/i386/pthread_arch.h	2023-04-07 12:07:07.929132587 +0000
+@@ -1,8 +1,7 @@
++extern uintptr_t g_pthread;
+ static inline uintptr_t __get_tp()
+ {
+-	uintptr_t tp;
+-	__asm__ ("movl %%gs:0,%0" : "=r" (tp) );
+-	return tp;
++	return g_pthread;
+ }
+ 
+ #define MC_PC gregs[REG_EIP]
+diff -r -u musl-1.2.3.orig/arch/i386/syscall_arch.h musl-1.2.3/arch/i386/syscall_arch.h
+--- arch/i386/syscall_arch.h	2022-04-07 17:12:40.000000000 +0000
++++ arch/i386/syscall_arch.h	2022-12-20 17:28:21.734839560 +0000
+@@ -1,3 +1,4 @@
++#define SYSCALL_NO_TLS 1
+ #define __SYSCALL_LL_E(x) \
+ ((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
+ ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
+diff -r -u musl-1.2.3.orig/src/env/__init_tls.c musl-1.2.3/src/env/__init_tls.c
+--- src/env/__init_tls.c	2022-04-07 17:12:40.000000000 +0000
++++ src/env/__init_tls.c	2023-04-07 12:07:38.677133193 +0000
+@@ -10,20 +10,19 @@
+ #include "syscall.h"
+ 
+ volatile int __thread_list_lock;
++uintptr_t g_pthread;
+ 
+ int __init_tp(void *p)
+ {
+ 	pthread_t td = p;
+ 	td->self = td;
+-	int r = __set_thread_area(TP_ADJ(p));
+-	if (r < 0) return -1;
+-	if (!r) libc.can_do_threads = 1;
+ 	td->detach_state = DT_JOINABLE;
+ 	td->tid = __syscall(SYS_set_tid_address, &__thread_list_lock);
+ 	td->locale = &libc.global_locale;
+ 	td->robust_list.head = &td->robust_list.head;
+ 	td->sysinfo = __sysinfo;
+ 	td->next = td->prev = td;
++	g_pthread = (uintptr_t) td;
+ 	return 0;
+ }
+ 

steps/musl-1.2.4/patches/avoid_sys_clone.patch

@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: 2023 Richard Masters <grick23@gmail.com>
+# SPDX-License-Identifier: MIT
+--- src/process/posix_spawn.c	2022-04-07 17:12:40.000000000 +0000
++++ src/process/posix_spawn.c	2023-04-07 12:01:57.217126467 +0000
+@@ -190,8 +190,11 @@
+ 		goto fail;
+ 	}
+ 
+-	pid = __clone(child, stack+sizeof stack,
+-		CLONE_VM|CLONE_VFORK|SIGCHLD, &args);
++	pid = fork();
++	if (pid == 0) {
++		_exit(child(&args));
++	}
++
+ 	close(args.p[1]);
+ 	UNLOCK(__abort_lock);
+ 

steps/musl-1.2.4/sources

@@ -0,0 +1 @@
+https://musl.libc.org/releases/musl-1.2.4.tar.gz 7a35eae33d5372a7c0da1188de798726f68825513b7ae3ebe97aaaa52114f039