Nano雞排: Build the Linux Kernel and Busybox for ARM and run them on QEMU

2019年6月23日星期日

Build the Linux Kernel and Busybox for ARM and run them on QEMU

安裝corss-compiler
brook@vista:~/qemu$ wget http://releases.linaro.org/components/toolchain/binaries/7.4-2019.02/arm-linux-gnueabihf/gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf.tar.xz 
brook@vista:~/qemu$ tar xvf gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf.tar.xz
brook@vista:~/qemu$ sudo mv gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf /opt/

編譯kernel
brook@vista:~/qemu$ cd linux-arm
brook@vista:~/qemu/linux-arm$ export ARCH=arm
brook@vista:~/qemu/linux-arm$ export CROSS_COMPILE=arm-linux-gnueabihf-
brook@vista:~/qemu/linux-arm$ export PATH=/opt/gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf/bin:$PATH
brook@vista:~/qemu/linux-arm$ make vexpress_defconfig
brook@vista:~/qemu/linux-arm$ make -j8

編譯busybox
brook@vista:~/qemu/busybox$ export ARCH=arm
brook@vista:~/qemu/busybox$ export CROSS_COMPILE=arm-linux-gnueabihf-
brook@vista:~/qemu/busybox$ make O=/home/brook/qemu/busybox-build menuconfig
--> change to static busybox

brook@vista:~/qemu/busybox$ cd ../busybox-build
brook@vista:~/qemu/busybox-build$ make -j8
brook@vista:~/qemu/busybox-build$ cp busybox ../initrd-arm/bin/busybox

generate initrd-image
brook@vista:~/qemu$ ./linux-arm/usr/gen_initramfs_list.sh -d initrd-arm > /tmp/brook_initramfs_list
brook@vista:~/qemu$ ./linux-arm/usr/gen_init_cpio /tmp/brook_initramfs_list > initrd-arm.img


執行QEMU
brook@vista:~/qemu$ /usr/local/bin/qemu-system-arm -M vexpress-a9 -m 512M -kernel ./linux-arm/arch/arm/boot/zImage -dtb ./linux-arm/arch/arm/boot/dts/vexpress-v2p-ca9.dtb -initrd ./initrd-arm.img -nographic -append "console=ttyAMA0"

http://albert-oma.blogspot.com/2017/12/qemu-arm-linux.html, [QEMU] 模擬一個實際的 ARM Linux 嵌入式系統
https://www.centennialsoftwaresolutions.com/blog/build-the-linux-kernel-and-busybox-for-arm-and-run-them-on-qemu, Build the Linux Kernel and Busybox for ARM and run them on QEMU

6 則留言:

c.s.2019年8月18日清晨7:20
brook@vista:~/qemu$ sudo tunctl -u jpr -t tap0
Set 'tap0' persistent and owned by uid 1000

brook@vista:~/qemu$ sudo ifconfig tap0 192.168.1.1

brook@vista:~/qemu$ /usr/local/bin/qemu-system-arm -M vexpress-a9 -m 512M -kernel ./linux-arm/arch/arm/boot/zImage -dtb ./linux-arm/arch/arm/boot/dts/vexpress-v2p-ca9.dtb -initrd ./initrd-arm.img -nographic -append "console=ttyAMA0" -nic tap,ifname=tap0

----- boot message -----

Please press Enter to activate this console. / #
/ # ifconfig lo up

/ # ifconfig eth0 192.168.1.2 up
Generic PHY 4e000000.ethernet-ffffffff:01: attached PHY driver [Generic PHY] (mii_bus:phy_addr=4e000000.ethernet-ffffffff:01, irq=POLL)
smsc911x 4e000000.ethernet eth0: SMSC911x/921x identified at 0xa08d0000, IRQ: 22

/ # ping 192.168.1.1 -c 1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
64 bytes from 192.168.1.1: seq=0 ttl=64 time=86.415 ms

--- 192.168.1.1 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 86.415/86.415/86.415 ms
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c.s.2020年5月24日凌晨3:02
Kernel hacking --->
[*] Kernel debugging
Compile-time checks and compiler options --->
[*] Compile the kernel with debug info
[*] Provide GDB scripts for kernel debugging
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c.s.2020年5月24日清晨6:26
https://lwn.net/Articles/753639/
GCC optimization for better debug experience (-Og)
Then introduce new config CC_OPTIMIZE_FOR_DEBUGGING which apply '-Og'
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c.s.2020年5月24日清晨6:28
for v4.19-rc8
https://github.com/0day-ci/linux/commits/changbin-du-intel-com/kernel-hacking-GCC-optimization-for-better-debug-experience
-Og/20180606-001415
---
Makefile | 4 ++++
arch/arm/mm/mmu.c | 2 +-
include/linux/compiler-gcc.h | 2 +-
include/linux/compiler.h | 2 +-
lib/Kconfig.debug | 21 +++++++++++++++++++++
5 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index bf3786e..70e059b 100644
--- a/Makefile
+++ b/Makefile
@@ -657,6 +657,9 @@ KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)

+ifdef CONFIG_DEBUG_EXPERIENCE
+KBUILD_CFLAGS += $(call cc-option, -Og)
+else
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
@@ -667,6 +670,7 @@ else
KBUILD_CFLAGS += -O2
endif
endif
+endif

KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
$(call cc-disable-warning,maybe-uninitialized,))
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index e46a6a4..c08d74e 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1599,7 +1599,7 @@ static void __init early_fixmap_shutdown(void)
pte_t *pte;
struct map_desc map;

- map.virtual = fix_to_virt(i);
+ map.virtual = __fix_to_virt(i);
pte = pte_offset_early_fixmap(pmd_off_k(map.virtual), map.virtual);

/* Only i/o device mappings are supported ATM */
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 4d36b27..ea46678 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -85,7 +85,7 @@

#define __compiletime_object_size(obj) __builtin_object_size(obj, 0)

-#ifndef __CHECKER__
+#if !defined(__CHECKER__) && !defined(CONFIG_DEBUG_EXPERIENCE)
#define __compiletime_warning(message) __attribute__((warning(message)))
#define __compiletime_error(message) __attribute__((error(message)))

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 681d866..a237661 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -320,7 +320,7 @@ static inline void *offset_to_ptr(const int *off)
* sparse see a constant array size without breaking compiletime_assert on old
* versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.
*/
-# ifndef __CHECKER__
+# if !defined(__CHECKER__) && !defined(CONFIG_DEBUG_EXPERIENCE)
# define __compiletime_error_fallback(condition) \
do { ((void)sizeof(char[1 - 2 * condition])); } while (0)
# endif
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4966c4f..fe09872 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2033,6 +2033,27 @@ config IO_STRICT_DEVMEM
if the driver using a given range cannot be disabled.

If in doubt, say Y.
+config DEBUG_EXPERIENCE
+ bool "Optimize for better debugging experience (-Og)"
+ default n
+ select NO_AUTO_INLINE
+ depends on !CC_OPTIMIZE_FOR_SIZE
+ help
+ This will apply GCC '-Og' optimization level get supported from
+ GCC 4.8. This optimization level offers a reasonable level of
+ optimization while maintaining fast compilation and a good
+ debugging experience. It is similar to '-O1' while perfer keeping
+ debug ability over runtime speed. The overall performance will
+ drop a bit.
+
+ If enabling this option break your kernel, you should either
+ disable this or find a fix (mostly in the arch code). Currently
+ this option has only be tested in qemu x86_64 guest.
+
+ Use only if you want to debug the kernel, especially if you want
+ to have better kernel debugging experience with gdb facilities
+ like kgdb and qemu.
+

source "arch/$(SRCARCH)/Kconfig.debug"

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c.s.2020年11月1日凌晨1:55
https://t.codebug.vip/questions-1106650.htm

使用-nographic執行qemu時如何將Ctrl-C傳遞给guest虛擬機器？
你可以尝試使用 sendkey 用 -monitor stdio命令 .虽然顯然是 -display none -serial mon:stdio 選項應该將Ctrl+c傳遞给訪客。

您還可以建立一个监视器套接字，如下所示：

qemu -display none -monitor unix:/tmp/qemu-monitor,server,nowait
然後，連線到监视器以使用sendkey和 socat 像這樣：

socat - UNIX-CONNECT:/tmp/qemu-monitor
您現在可以發送密钥，如下所示：

(qemu) sendkey ctrl-c
sendkey ctrl-c
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c.s.2021年3月20日凌晨2:12
qemu-system-arm -M vexpress-a9 -m 256M -nographic -kernel u-boot
或者
qemu-system-arm -M vexpress-a9 -m 256M -serial stdio -kernel u-boot
发现，如果没有指定-nographics, 则必须要加-serial stdio才会有打印。
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Nano雞排

2019年6月23日星期日

Build the Linux Kernel and Busybox for ARM and run them on QEMU

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2019年6月23日 星期日

Build the Linux Kernel and Busybox for ARM and run them on QEMU

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2019年6月23日星期日