Commits on Jul 28, 2023

1. feat: Provide VDSO image and __kernel_vsyscall interface …

   This patch provides the capability to automatically generate a VDSO
   (Virtual Dynamic Shared Object) image and pass it to the application.
   The VDSO contains only symbols, while its actual implementation is
   retained in the kernel, with their mapping relationship recorded in
   `vdso_mapping.conf`.
   
   Additionally, this introduces the `__kernel_vsyscall` interface,
   which allows libc to access system calls without relying on slow
   binary syscalls. The difference between `__kernel_vsyscall` and
   `uk_syscall6_r` lies in considering TLS (Thread Local Storage)
   switching, enabling both the kernel and user applications to use
   thread-local storage seamlessly. To utilize this feature, the libc
   needs to be modified accordingly, please refer to `fork-musl` [1]
   and `fork-glibc` [2] for further information.
   
   To use the VDSO, please select
   `Application Options -> Provide VDSO Image`.
   
   [1] https://github.com/unikraft/fork-musl
   [2] https://github.com/unikraft/fork-glibc
   
   Signed-off-by: Tianyi Liu <i.pear@outlook.com>

   

   i-Pear committed Jul 28, 2023
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