[Defcon Russia #29] Борис Савков - Bare-metal programming на примере Raspberry Pi

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Докладчик покажет, как с помощью bare-metal programming подружить Raspberry Pi с GPIO, памятью и Ethernet, и пояснит, кому и зачем это может понадобиться.

Internet

Bare-metal programming на
примере Raspberry Pi
10/03/2017
DCG #7812
г. Санкт-Петербург

Who am i
Ранее:
• DC4919;
• Bushwhackers;
• BalalaikaCr3w.
Сейчас:
• Evil Dwarfs;
• Безопасность АСУ ТП;
• OWASP Russia;
• jbfc;
• It sec pro course;
• ASP Labs.
Defcon Russia (DCG #7812) 2

Bare-metal
• Обучение
http://www.cl.cam.ac.uk/freshers/raspberr
ypi/tutorials/
http://wiki.osdev.org/Raspberry_Pi_Bare_Bo
nes
• Производительность
• For fun!
Defcon Russia (DCG #7812) 3

Raspberry pi
Defcon Russia (DCG #7812) 4

Why raspberry pi
• дёшево
• много материалов (-RP 3)
Defcon Russia (DCG #7812) 5

CPU
RPi:
• ARM1176GTZF
RPi 2:
• Cortex A7
RPi 3:
• Cortex A53(Aarch-64)
Defcon Russia (DCG #7812) 6

CPU
RPi:
• arm-none-eabi-gcc -O2 -mfpu=vfp -mfloat-
abi=hard -march=armv6zk -mtune=arm1176jzf-s
arm-test.c
RPi 2:
• arm-none-eabi-gcc -O2 -mfpu=vfp -mfloat-
abi=hard -march=armv7-a -mtune=cortex-a7 arm-
test.c
RPi 3:
• aarch64-elf-gcc (linaro cross gcc)
(https://releases.linaro.org/components/toolchain/binaries/6.1-
2016.08/aarch64-elf/ )
*arm-none-eabi-objcopy kernel.elf -O binary kernel.img
Defcon Russia (DCG #7812) 7

How it works
Defcon Russia (DCG #7812) 9
RAM 0
X00000000
-------------------
IO
0x3f0000000
or
0x20000000
-------------------
GPIO
0x3f0200000
or
0x20200000
-------------------
...
GPU
CPU

Steps
1. Start GPU
– Read SD
2. CPU
– bootload.bin, start.elf, config
3. Start CPU cores
– Run Kernel.img
Defcon Russia (DCG #7812) 10

Files
1. bootloader.bin
загружает start.elf
2. start.elf
прошивка GPU которая стартует CPU
3. config.txt
конфигурация
4. kernel.img
OS или ваша программа
Defcon Russia (DCG #7812) 11

config.txt
Defcon Russia (DCG #7812) 12
Examples:
arm_control=0x200 (запуск в x64)
kernel_old=1 (загрузка с 0)
disable_commandline_tags=1
kernel_old=1
disable_commandline_tags=1
kernel_address=0x06000000

Other files
https://github.com/raspberrypi/firmware
Defcon Russia (DCG #7812) 13

GPIO
Defcon Russia (DCG #7812) 14
https://rawgit.com/msperl/rpi-registers/master/rpi-registers.html

UART
Examples:
https://github.com/gingold-adacore/rpi3-
fosdem17
Defcon Russia (DCG #7812) 15

Blink
Examples:
http://www.valvers.com/open-
software/raspberry-pi/step01-bare-metal-
programming-in-cpt1/ (RPI, RPI 2)
https://github.com/dwelch67/raspberrypi
Defcon Russia (DCG #7812) 16

Wanna more
Examples:
https://github.com/PeterLemon/RaspberryPi
https://www.raspberrypi.org/forums/viewtopic.
php?t=72260
Defcon Russia (DCG #7812) 17

USB
Examples:
https://github.com/rsta2/uspi
Defcon Russia (DCG #7812) 18

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1. Bare-metal programming на примере Raspberry Pi 10/03/2017 DCG #7812 г. Санкт-Петербург

2. Who am i Ранее: • DC4919; • Bushwhackers; • BalalaikaCr3w. Сейчас: • Evil Dwarfs; • Безопасность АСУ ТП; • OWASP Russia; • jbfc; • It sec pro course; • ASP Labs. Defcon Russia (DCG #7812) 2

3. Bare-metal • Обучение http://www.cl.cam.ac.uk/freshers/raspberr ypi/tutorials/ http://wiki.osdev.org/Raspberry_Pi_Bare_Bo nes • Производительность • For fun! Defcon Russia (DCG #7812) 3

4. Raspberry pi Defcon Russia (DCG #7812) 4

5. Why raspberry pi • дёшево • много материалов (-RP 3) Defcon Russia (DCG #7812) 5

6. CPU RPi: • ARM1176GTZF RPi 2: • Cortex A7 RPi 3: • Cortex A53(Aarch-64) Defcon Russia (DCG #7812) 6

7. CPU RPi: • arm-none-eabi-gcc -O2 -mfpu=vfp -mfloat- abi=hard -march=armv6zk -mtune=arm1176jzf-s arm-test.c RPi 2: • arm-none-eabi-gcc -O2 -mfpu=vfp -mfloat- abi=hard -march=armv7-a -mtune=cortex-a7 arm- test.c RPi 3: • aarch64-elf-gcc (linaro cross gcc) (https://releases.linaro.org/components/toolchain/binaries/6.1- 2016.08/aarch64-elf/ ) *arm-none-eabi-objcopy kernel.elf -O binary kernel.img Defcon Russia (DCG #7812) 7

8. Cortex A53 Defcon Russia (DCG #7812) 8

9. How it works Defcon Russia (DCG #7812) 9 RAM 0 X00000000 ------------------- IO 0x3f0000000 or 0x20000000 ------------------- GPIO 0x3f0200000 or 0x20200000 ------------------- ... GPU CPU

10. Steps 1. Start GPU – Read SD 2. CPU – bootload.bin, start.elf, config 3. Start CPU cores – Run Kernel.img Defcon Russia (DCG #7812) 10

11. Files 1. bootloader.bin загружает start.elf 2. start.elf прошивка GPU которая стартует CPU 3. config.txt конфигурация 4. kernel.img OS или ваша программа Defcon Russia (DCG #7812) 11

12. config.txt Defcon Russia (DCG #7812) 12 Examples: arm_control=0x200 (запуск в x64) kernel_old=1 (загрузка с 0) disable_commandline_tags=1 kernel_old=1 disable_commandline_tags=1 kernel_address=0x06000000

13. Other files https://github.com/raspberrypi/firmware Defcon Russia (DCG #7812) 13

14. GPIO Defcon Russia (DCG #7812) 14 https://rawgit.com/msperl/rpi-registers/master/rpi-registers.html

15. UART Examples: https://github.com/gingold-adacore/rpi3- fosdem17 Defcon Russia (DCG #7812) 15

16. Blink Examples: http://www.valvers.com/open- software/raspberry-pi/step01-bare-metal- programming-in-cpt1/ (RPI, RPI 2) https://github.com/dwelch67/raspberrypi Defcon Russia (DCG #7812) 16

17. Wanna more Examples: https://github.com/PeterLemon/RaspberryPi https://www.raspberrypi.org/forums/viewtopic. php?t=72260 Defcon Russia (DCG #7812) 17

18. USB Examples: https://github.com/rsta2/uspi Defcon Russia (DCG #7812) 18

19. Free SCADA Defcon Russia (DCG #7812) 19

20. Q? Defcon Russia (DCG #7812) 20

[Defcon Russia #29] Борис Савков - Bare-metal programming на примере Raspberry Pi

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[Defcon Russia #29] Борис Савков - Bare-metal programming на примере Raspberry Pi