60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// This program loads kernel and initrd which the system will boot into when
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// panic occurs.
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/kexec.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#if defined(__aarch64__)
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#define EARLYCON "earlycon=uart8250,mmio,0x3f8"
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#elif defined(__x86_64__)
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#define EARLYCON "earlycon=uart8250,io,0x3f8"
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#endif
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static const char *KERNEL = "/system/etc/microdroid_crashdump_kernel";
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static const char *INITRD = "/system/etc/microdroid_crashdump_initrd.img";
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static const char *CMDLINE = "1 panic=-1 rdinit=/bin/crashdump nr_cpus=1 reset_devices "
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"console=hvc0 " EARLYCON;
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static int open_checked(const char* path) {
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int fd = open(path, O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
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exit(1);
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}
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return fd;
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}
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int main() {
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unsigned long cmdline_len = strlen(CMDLINE) + 1; // include null terminator, otherwise EINVAL
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if (syscall(SYS_kexec_file_load, open_checked(KERNEL), open_checked(INITRD), cmdline_len,
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CMDLINE, KEXEC_FILE_ON_CRASH) == -1) {
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fprintf(stderr, "Failed to load panic kernel: %s\n", strerror(errno));
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return 1;
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}
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return 0;
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}
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