kernel调试环境搭建

download

buildroot

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wget https://buildroot.org/downloads/buildroot-2023.02.tar.xz
tar xf buildroot-2023.02.tar.xz && cd buildroot-2023.02

qemu

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wget https://download.qemu.org/qemu-8.1.1.tar.xz
tar xvJf qemu-8.1.1.tar.xz
cd qemu-8.1.1

qemu的一些小tips

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sudo apt-get install ninja-build libpixman-1-dev libglib2.0-dev
“qemu-system” ./configure --target-list=${QEMU_TARGET_LIST}-softmmu
“qemu-user” ./configure --target-list=${QEMU_TARGET_LIST}-linux-user

架构

因为用的是qemu，buildroot有预先准备了这些配置

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make list-defconfigs
  qemu_aarch64_ebbr_defconfig         - Build for qemu_aarch64_ebbr
  qemu_aarch64_sbsa_defconfig         - Build for qemu_aarch64_sbsa
  qemu_aarch64_virt_defconfig         - Build for qemu_aarch64_virt
  qemu_arm_ebbr_defconfig             - Build for qemu_arm_ebbr
  qemu_arm_versatile_defconfig        - Build for qemu_arm_versatile
  qemu_arm_vexpress_defconfig         - Build for qemu_arm_vexpress
  qemu_arm_vexpress_tz_defconfig      - Build for qemu_arm_vexpress_tz
  qemu_m68k_mcf5208_defconfig         - Build for qemu_m68k_mcf5208
  qemu_m68k_q800_defconfig            - Build for qemu_m68k_q800
  qemu_microblazebe_mmu_defconfig     - Build for qemu_microblazebe_mmu
  qemu_microblazeel_mmu_defconfig     - Build for qemu_microblazeel_mmu
  qemu_mips32r2el_malta_defconfig     - Build for qemu_mips32r2el_malta
  qemu_mips32r2_malta_defconfig       - Build for qemu_mips32r2_malta
  qemu_mips32r6el_malta_defconfig     - Build for qemu_mips32r6el_malta
  qemu_mips32r6_malta_defconfig       - Build for qemu_mips32r6_malta
  qemu_mips64el_malta_defconfig       - Build for qemu_mips64el_malta
  qemu_mips64_malta_defconfig         - Build for qemu_mips64_malta
  qemu_mips64r6el_malta_defconfig     - Build for qemu_mips64r6el_malta
  qemu_mips64r6_malta_defconfig       - Build for qemu_mips64r6_malta
  qemu_nios2_10m50_defconfig          - Build for qemu_nios2_10m50
  qemu_or1k_defconfig                 - Build for qemu_or1k
  qemu_ppc64_e5500_defconfig          - Build for qemu_ppc64_e5500
  qemu_ppc64le_powernv8_defconfig     - Build for qemu_ppc64le_powernv8
  qemu_ppc64le_pseries_defconfig      - Build for qemu_ppc64le_pseries
  qemu_ppc64_pseries_defconfig        - Build for qemu_ppc64_pseries
  qemu_ppc_bamboo_defconfig           - Build for qemu_ppc_bamboo
  qemu_ppc_e500mc_defconfig           - Build for qemu_ppc_e500mc
  qemu_ppc_g3beige_defconfig          - Build for qemu_ppc_g3beige
  qemu_ppc_mac99_defconfig            - Build for qemu_ppc_mac99
  qemu_ppc_mpc8544ds_defconfig        - Build for qemu_ppc_mpc8544ds
  qemu_riscv32_virt_defconfig         - Build for qemu_riscv32_virt
  qemu_riscv64_nommu_virt_defconfig   - Build for qemu_riscv64_nommu_virt
  qemu_riscv64_virt_defconfig         - Build for qemu_riscv64_virt
  qemu_s390x_defconfig                - Build for qemu_s390x
  qemu_sh4eb_r2d_defconfig            - Build for qemu_sh4eb_r2d
  qemu_sh4_r2d_defconfig              - Build for qemu_sh4_r2d
  qemu_sparc64_sun4u_defconfig        - Build for qemu_sparc64_sun4u
  qemu_sparc_ss10_defconfig           - Build for qemu_sparc_ss10
  qemu_x86_64_defconfig               - Build for qemu_x86_64
  qemu_x86_defconfig                  - Build for qemu_x86
  qemu_xtensa_lx60_defconfig          - Build for qemu_xtensa_lx60
  qemu_xtensa_lx60_nommu_defconfig    - Build for qemu_xtensa_lx60_nommu

编译前准备

开debug

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$ make menuconfig
Build options --->
[*] build packages with debugging symbols
      gcc debug level (debug level 3)  --->
[ ] strip target binaries

关KALSR（make的时间可能较长慢慢等就是了）

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$ make linux-menuconfig
Processor type and features   --->
[*] Build a relocatable kernel
[ ]   Randomize the address of the kernel image (KASLR)

重打包

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#!/bin/bash
# thk n132
# ./repk.sh ./rootfs
cd $1 &&\
find . | cpio -o --format=newc > ../rootfs.cpio &&\
cd .. &&\
mv ./rootfs.cpio ./initramfs.cpio &&\
rm -rf ./initramfs.cpio.gz &&\
gzip  ./initramfs.cpio &&\
echo "[+] Filesystem - Done"