reference
export ARCH=arm-linux (arm-cortexa5-linux-uclibcgnueabihf ct-ng)
export CROSS_COMPILE=arm-linux-gnueabi-
Linux kernel (3.15)
make clean
make mrproper
make vexpress_defconfig
make menuconfig
General setup --->
[ X ] Embedded system
Configure standard kernel feature(expert users) --->
[ * ] Enable ELF core dump (new)
Enable debug mode in uClibc
download: (0.9.28 trendnet lib for 312 model) http://www.uclibc.org/downloads/old-releases/
make CROSS=arm-linux- menuconfig
General Library Settings --->
Build pthreads debugging support
this option not found in 0.9.28 version
uClibc development/debugging options --->
Strip libraries and executables
Enable Core Dump support in Busybox
- Init Utilities --->Support dumping core for child processes (debugging only)
- Second, create an empty file in the target’s filesystem’s root directory, called “.init_enable_core“.
build ramfs
_install$ arm-linux-ldd --root bin bin/busybox
libm.so.0 => /lib/libm.so.0 (0x8badf00d)
libc.so.0 => /lib/libc.so.0 (0x8badf00d)
ld-uClibc.so.0 => /lib/ld-uClibc.so.0 (0x8badf00d)
mkdir lib
copy busybox depend files to lib folder
find depends file in cross compiler folder
~/x-tools/arm-cortexa5-linux-uclibcgnueabihf$ find . -name libm.so.0
./arm-cortexa5-linux-uclibcgnueabihf/sysroot/lib/libm.so.0
cp -v <cross_compiler_lib>/libm.so.0 _install/lib
cp -v <cross_compiler_lib>/libc.so.0 _install/lib
cp -v <cross_compiler_lib>/ld-uClibc.so.0 _install/lib
first check
_install$ find . | cpio -o --format=newc > ../../rootfs.img
note
qemu-system-arm -machine help
qemu-system-arm -M vexpress-a9 -m 128M -kernel zImage -initrd rootfs.img -append "root=/dev/ram rdinit=/bin/sh"
_install$mkdir proc sys dev etc etc/init.d
_install$ vim etc/init.d/rcS
#!/bin/sh
mount -t proc none /proc
mount -t sysfs none /sys
/sbin/mdev -s
_install$ chmod +x etc/init.d/rcS
_install$ find . | cpio -o --format=newc > ../../rootfs.img
qemu-system-arm -M vexpress-a9 -m 128M -kernel zImage -initrd rootfs.img -append "root=/dev/ram rdinit=/sbin/init"
-redir tcp:8888::80
check
#include <stdlib.h> // C
//#include <cstdlib> // C++
void main(void)
{
abort();
}
arm-linux-gcc -o cdump cdump.c -static
