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2002-08-31 Andreas Jaeger <aj@suse.de> * sysdeps/unix/sysv/linux/x86_64/Makefile (sysdep_routines): Add __start_context. * sysdeps/unix/sysv/linux/x86_64/__start_context.S: New file. * sysdeps/unix/sysv/linux/x86_64/makecontext.c: New file. * sysdeps/unix/sysv/linux/x86_64/ucontext_i.h: Add defines for registers used for passing args. * sysdeps/unix/sysv/linux/x86_64/swapcontext.S: Save and restore all needed registers. * sysdeps/unix/sysv/linux/x86_64/setcontext.S: Restore all registers. * sysdeps/unix/sysv/linux/x86_64/getcontext.S: Save all needed registers.
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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. */ | ||
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#include <sysdep.h> | ||
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/* 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. */ | ||
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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 | ||
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popq %rdi /* This is the next context. */ | ||
testq %rdi, %rdi | ||
je 2f /* If it is zero exit. */ | ||
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call JUMPTARGET(__setcontext) | ||
/* If this returns (which can happen if the syscall fails) we'll | ||
exit the program with the return error value (-1). */ | ||
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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) |
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