Re: the syscall stack frame and Context::regs method
Adam Lackorzynski <[email protected]>
| Newsgroups | gmane.comp.micro-kernel.l4.devel |
|---|---|
| Message-ID | <[email protected]> |
On Tue Apr 28, 2015 at 15:42:14 +0800, watermirror wrote: > i am reading the code about system call. > > > after the sys_ipc_wrapper (in file kern/syscalls.cpp) is called.it get the thread's pointer by current_thread and then get the Syscall_frame. the code is like this: > ... > Thread *curr=current_thread(); > Syscall_frame *f = curr->regs(); > ... > > i can not understand the relationship between curr->regs() and the system call's stack frame. current_thread()->regs() points to the entry frame, i.e. the struct that has all the register state from the user. Explained? Adam -- Adam [email protected] Lackorzynski http://os.inf.tu-dresden.de/~adam/