Build kexec-linux later as a package for musl lib calls instead of asm.

sysa/kexec-linux-1.0.0/files/kexec-linux.c

@@ -0,0 +1,78 @@
+/* SPDX-FileCopyrightText: 2023 Richard Masters <grick23@gmail.com> */
+/* SPDX-License-Identifier: MIT */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/reboot.h>
+#include <sys/stat.h>
+#include <time.h>
+
+int append_file(FILE *dst_file, char *src_file_name);
+
+
+int main(int argc, char **argv) {
+	char *ramdrive_file_name, *kernel_file_name, *initramfs_file_name;
+	FILE *ramdrive_file;
+	struct stat stats;
+
+	if (argc < 3) {
+		puts("Usage: fiwix-kexec-linux <ram-drive-name> <kernel-file-name> <initramfs-file-name>");
+		exit(1);
+	}
+
+	ramdrive_file_name = argv[1];
+	kernel_file_name = argv[2];
+	initramfs_file_name = argv[3];
+
+
+	ramdrive_file = fopen(ramdrive_file_name, "wb");
+
+	/* Write length of kernel */
+	if (stat(kernel_file_name, &stats) == 0) {
+		fwrite(&stats.st_size, 4, 1, ramdrive_file);
+	} else {
+		fprintf(stderr, "Cannot stat kernel file '%s'\n", kernel_file_name);
+		exit(1);
+	}
+
+	/* Write length of initramfs */
+	if (stat(initramfs_file_name, &stats) == 0) {
+		fwrite(&stats.st_size, 4, 1, ramdrive_file);
+	} else {
+		fprintf(stderr, "Cannot stat initramfs file '%s'\n", initramfs_file_name);
+		exit(1);
+	}
+
+	if (append_file(ramdrive_file, kernel_file_name)) {
+		fprintf(stderr, "Cannot append kernel '%s'\n", kernel_file_name);
+		exit(1);
+	}
+	if (append_file(ramdrive_file, initramfs_file_name)) {
+		fprintf(stderr, "Cannot append initramfs '%s'\n", initramfs_file_name);
+		exit(1);
+	}
+	fclose(ramdrive_file);
+
+	/* Flush ram drive writes to device */
+	sync();
+
+	/* Perform syscall reboot to initiate kexec */
+	reboot(RB_HALT_SYSTEM);
+}
+
+int append_file(FILE *dst_file, char *src_file_name) {
+	FILE *src_file;
+	char buff[BUFSIZ];
+	size_t n;
+ 
+	if (src_file = fopen(src_file_name, "rb")) {
+		while ((n = fread(buff, 1, BUFSIZ, src_file)) != 0) {
+			fwrite(buff, 1, n, dst_file );
+		}
+		fclose(src_file);
+		return 0;
+	} else {
+		printf("Cannot open file '%s'\n", src_file_name);
+		return 1;
+	}
+}

sysa/kexec-linux-1.0.0/kexec-linux-1.0.0.sh

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+#!/bin/bash
+# SPDX-FileCopyrightText: 2023 Richard Masters <grick23@gmail.com>
+# SPDX-License-Identifier: MIT
+src_get() {
+    :
+}
+
+src_unpack() {
+    dirname=kexec-linux-1.0.0
+    mkdir ${dirname}
+}
+
+src_install() {
+    install -D "kexec-linux" "${DESTDIR}${PREFIX}/bin/kexec-linux"
+}

sysa/kexec-linux-1.0.0/mk/main.mk

@@ -0,0 +1,4 @@
+# SPDX-FileCopyrightText: 2023 Richard Masters <grick23@gmail.com>
+# SPDX-License-Identifier: MIT
+kexec-linux: kexec-linux.c
+	gcc -static -m32 -march=i386 -o $@ $^