GDB调试Qemu程序

1.编译与安装qemu时需要添加debug选项，即--enable-debug,--enable-debug-info

2.编译内核，根据需要，选择编译选项（bzImage）

3.编译安装BusyBox

Busybox Settings  --->
  --- Build Options
  [*]   Build BusyBox as a position independent executable  

4.制作initramfs

#!/usr/bin/bash
ROOTFS=rootfs
BUSYBOX=$(find busybox* -maxdepth 0 -type d)
SYSROOT=$(x86_64-linux-gnu-gcc --print-sysroot)
GLIBC_VERSION=$(${SYSROOT}/usr/bin/ldd --version | head -1 | cut -d' ' -f4)
DYNAMIC_LIB_PATH_32=${SYSROOT}/lib
DYNAMIC_LIB_PATH_64=${SYSROOT}/lib64

rm -rf $ROOTFS
mkdir -p ${ROOTFS}/{proc,sys,dev,etc,etc/init.d,lib,lib64,mnt,tmp,go}

cat > $ROOTFS/etc/init.d/rcS <<EOF
#!/bin/sh
mount -t proc none /proc
mount -t sysfs none /sys
/sbin/mdev -s
ifconfig lo up
EOF

chmod +x $ROOTFS/etc/init.d/rcS

cat > $ROOTFS/etc/inittab <<EOF
# /etc/inittab
::sysinit:/etc/init.d/rcS
::askfirst:-/bin/sh
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a -r
EOF

chmod +x $ROOTFS/etc/inittab

cp -rP ${BUSYBOX}/_install/* ${ROOTFS}

cp -rP ${DYNAMIC_LIB_PATH_64}/libc-${GLIBC_VERSION}.so ${ROOTFS}/lib64/
cp -rP ${DYNAMIC_LIB_PATH_64}/libc.so.6 ${ROOTFS}/lib64/

cp -rP ${DYNAMIC_LIB_PATH_64}/libm-${GLIBC_VERSION}.so ${ROOTFS}/lib64/
cp -rP ${DYNAMIC_LIB_PATH_64}/libm.so.6 ${ROOTFS}/lib64/

cp -rP ${DYNAMIC_LIB_PATH_64}/librt-${GLIBC_VERSION}.so ${ROOTFS}/lib64/
cp -rP ${DYNAMIC_LIB_PATH_64}/librt.so.1 ${ROOTFS}/lib64/

cp -rP ${DYNAMIC_LIB_PATH_64}/libpthread-${GLIBC_VERSION}.so ${ROOTFS}/lib64/
cp -rP ${DYNAMIC_LIB_PATH_64}/libpthread.so.0 ${ROOTFS}/lib64/

cp -rP ${DYNAMIC_LIB_PATH_64}/ld-${GLIBC_VERSION}.so ${ROOTFS}/lib64/
cp -rP ${DYNAMIC_LIB_PATH_64}/ld-linux-x86-64.so.2 ${ROOTFS}/lib64/

cd ${ROOTFS}
ln -sf bin/busybox init
find . | cpio -o --format=newc > ../initramfs

4.调试qemu时，命令如下：

gdb -tui --args qemu-system-x86_64  -nographic \
-kernel ./bzImage -initrd ./initramfs -append  "console=ttyS0 quiet"

5.利用GDB调试Qemu程序。

6.引用

https://siweixiang.github.io/notes/2016_06_19_build_minimal_linux_hack_env_with_busybox_x86_64.html