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glibc/sysdeps/unix/sysv/linux/x86_64/__start_context.S
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/* Copyright (C) 2002 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Andreas Jaeger <aj@suse.de>, 2002. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <sysdep.h> | |
/* This is the helper code which gets called if a function which is | |
registered with 'makecontext' returns. In this case we have to | |
install the context listed in the uc_link element of the context | |
'makecontext' manipulated at the time of the 'makecontext' call. | |
If the pointer is NULL the process must terminate. */ | |
ENTRY(__start_context) | |
/* This removes the parameters passed to the function given to | |
'makecontext' from the stack. RBX contains the address | |
on the stack pointer for the next context. */ | |
movq %rbx, %rsp | |
popq %rdi /* This is the next context. */ | |
testq %rdi, %rdi | |
je 2f /* If it is zero exit. */ | |
call JUMPTARGET(__setcontext) | |
/* If this returns (which can happen if the syscall fails) we'll | |
exit the program with the return error value (-1). */ | |
2: movq %rax,%rdi | |
call JUMPTARGET(exit) | |
/* The 'exit' call should never return. In case it does cause | |
the process to terminate. */ | |
hlt | |
END(__start_context) |