mirror of
https://github.com/systemd/systemd.git
synced 2024-12-23 21:35:11 +03:00
86 lines
2.6 KiB
Bash
Executable File
86 lines
2.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: LGPL-2.1-or-later
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set -e
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if [[ $# -lt 2 ]]; then
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echo "Usage: ${0} TARGET INPUT [GDBSCRIPT]"
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echo "Debug systemd-boot/stub in QEMU."
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echo
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echo "TARGET should point to the EFI binary to be examined inside the"
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echo "build directory (systemd-boot\$ARCH.efi or linux\$arch.efi.stub)."
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echo
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echo "INPUT should point to the QEMU serial output pipe. This is used to"
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echo "extract the location of the symbols. For this to work, QEMU must"
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echo "be run with '-s -serial pipe:PATH'. Note that QEMU will append"
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echo ".in/.out to the path, while this script expects the out pipe directly."
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echo
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echo "If GDBSCRIPT is empty, gdb is run directly attached to the boot"
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echo "loader, otherwise a script is generated in the given path that allows"
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echo "attaching manually like this:"
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echo " (gdb) source GDBSCRIPT"
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echo " (gdb) target remote :1234"
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echo
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echo "Example usage:"
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echo " mkfifo /tmp/sdboot.{in,out}"
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echo " qemu-system-x86_64 [...] -s -serial pipe:/tmp/sdboot"
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echo " ./tools/debug-sd-boot.sh ./build/src/boot/efi/systemd-bootx64.efi \\"
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echo " /tmp/sdboot.out"
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exit 1
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fi
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binary=$(realpath "${1}")
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if [[ "${1}" =~ systemd-boot([[:alnum:]]+).efi ]]; then
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target="systemd-boot"
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symbols=$(realpath "${1%efi}elf")
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elif [[ "${1}" =~ linux([[:alnum:]]+).efi.stub ]]; then
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target="systemd-stub"
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symbols=$(realpath "${1%efi.stub}elf.stub")
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else
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echo "Cannot detect EFI binary '${1}'."
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exit 1
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fi
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case "${BASH_REMATCH[1]}" in
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ia32) arch="i386";;
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x64) arch="i386:x86-64";;
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aa64) arch="aarch64";;
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arm|riscv64) arch="${BASH_REMATCH[1]}";;
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*)
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echo "Unknown EFI arch '${BASH_REMATCH[1]}'."
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exit 1
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esac
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# system-boot will print out a line like this to inform us where gdb is supposed to
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# look for .text and .data section:
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# systemd-boot@0x0,0x0
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while read -r line; do
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if [[ "${line}" =~ ${target}@(0x[[:xdigit:]]+),(0x[[:xdigit:]]+) ]]; then
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text="${BASH_REMATCH[1]}"
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data="${BASH_REMATCH[2]}"
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break
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fi
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done < "${2}"
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if [[ -z "${text}" || -z "${data}" ]]; then
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echo "Could not determine text and data location."
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exit 1
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fi
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if [[ -z "${3}" ]]; then
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gdb_script=$(mktemp /tmp/debug-sd-boot.XXXXXX.gdb)
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trap 'rm -f "${gdb_script}"' EXIT
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else
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gdb_script="${3}"
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fi
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echo "file ${binary}
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add-symbol-file ${symbols} ${text} -s .data ${data}
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set architecture ${arch}" > "${gdb_script}"
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if [[ -z "${3}" ]]; then
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gdb -x "${gdb_script}" -ex "target remote :1234"
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else
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echo "GDB script written to '${gdb_script}'."
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fi
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