| #!/bin/bash |
| # SPDX-License-Identifier: GPL-2.0+ |
| # |
| # Create an initrd directory if one does not already exist. |
| # |
| # Copyright (C) IBM Corporation, 2013 |
| # |
| # Author: Connor Shu <Connor.Shu@ibm.com> |
| |
| D=tools/testing/selftests/rcutorture |
| |
| # Prerequisite checks |
| if [ ! -d "$D" ]; then |
| echo >&2 "$D does not exist: Malformed kernel source tree?" |
| exit 1 |
| fi |
| if [ -s "$D/initrd/init" ]; then |
| echo "$D/initrd/init already exists, no need to create it" |
| exit 0 |
| fi |
| |
| # Create a C-language initrd/init infinite-loop program and statically |
| # link it. This results in a very small initrd. |
| echo "Creating a statically linked C-language initrd" |
| cd $D |
| mkdir -p initrd |
| cd initrd |
| cat > init.c << '___EOF___' |
| #ifndef NOLIBC |
| #include <unistd.h> |
| #include <sys/time.h> |
| #endif |
| |
| volatile unsigned long delaycount; |
| |
| int main(int argc, char *argv[]) |
| { |
| int i; |
| struct timeval tv; |
| struct timeval tvb; |
| |
| printf("Torture-test rudimentary init program started, command line:\n"); |
| for (i = 0; i < argc; i++) |
| printf(" %s", argv[i]); |
| printf("\n"); |
| for (;;) { |
| sleep(1); |
| /* Need some userspace time. */ |
| if (gettimeofday(&tvb, NULL)) |
| continue; |
| do { |
| for (i = 0; i < 1000 * 100; i++) |
| delaycount = i * i; |
| if (gettimeofday(&tv, NULL)) |
| break; |
| tv.tv_sec -= tvb.tv_sec; |
| if (tv.tv_sec > 1) |
| break; |
| tv.tv_usec += tv.tv_sec * 1000 * 1000; |
| tv.tv_usec -= tvb.tv_usec; |
| } while (tv.tv_usec < 1000); |
| } |
| return 0; |
| } |
| ___EOF___ |
| |
| # build using nolibc on supported archs (smaller executable) and fall |
| # back to regular glibc on other ones. |
| if echo -e "#if __x86_64__||__i386__||__i486__||__i586__||__i686__" \ |
| "||__ARM_EABI__||__aarch64__||__s390x__||__loongarch__\nyes\n#endif" \ |
| | ${CROSS_COMPILE}gcc -E -nostdlib -xc - \ |
| | grep -q '^yes'; then |
| # architecture supported by nolibc |
| ${CROSS_COMPILE}gcc -fno-asynchronous-unwind-tables -fno-ident \ |
| -nostdlib -include ../../../../include/nolibc/nolibc.h \ |
| -s -static -Os -o init init.c -lgcc |
| ret=$? |
| else |
| ${CROSS_COMPILE}gcc -s -static -Os -o init init.c |
| ret=$? |
| fi |
| |
| if [ "$ret" -ne 0 ] |
| then |
| echo "Failed to create a statically linked C-language initrd" |
| exit "$ret" |
| fi |
| |
| rm init.c |
| echo "Done creating a statically linked C-language initrd" |
| |
| exit 0 |