Syscalls extractor improvements
The current syscalls extractor in instrumentation/syscalls/lttng-syscalls-extractor is a bit tedious to use. A user needs to patch his kernel with the patch found in the same dir, build the kernel, run the kernel on his target, build a kernel module, modprobe and the finally dump the syscalls table.
It is feasible to eliminate the need to patch the kernel and build a custom kernel module. By building the kernel with CONFIG_FTRACE_SYSCALLS, the syscalls metadata are put in a ELF section named "syscalls_metadata". We can thus use already available tools such as extract-vmlinux1 and readelf to get our syscall table.
./extract-vmlinux /boot/vmlinuz-linux > kernel && readelf -p .syscalls_metadata kernel
The remaining scripts would need to be adapted to fit with the output of readelf.
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