diff options
Diffstat (limited to 'libc/sysdeps/linux/sparc64/swapcontext.c')
| -rw-r--r-- | libc/sysdeps/linux/sparc64/swapcontext.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc64/swapcontext.c b/libc/sysdeps/linux/sparc64/swapcontext.c new file mode 100644 index 000000000..f6dfc20ba --- /dev/null +++ b/libc/sysdeps/linux/sparc64/swapcontext.c @@ -0,0 +1,46 @@ +/* Copyright (C) 2001-2017 Free Software Foundation, Inc. + Contributed by Jakub Jelinek <jakub@redhat.com>. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#include <ucontext.h> + +extern int __getcontext (ucontext_t *ucp); +extern int __setcontext (const ucontext_t *ucp, int restoremask); + +int +__swapcontext (ucontext_t *oucp, const ucontext_t *ucp) +{ + extern void __swapcontext_ret (void); + /* Save the current machine context to oucp. */ + __getcontext (oucp); + /* Modify oucp to skip the __setcontext call on reactivation. */ + oucp->uc_mcontext.mc_gregs[MC_PC] = (long) __swapcontext_ret; + oucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) __swapcontext_ret) + 4; + /* Restore the machine context in ucp. */ + __setcontext (ucp, 1); + return 0; +} + +__asm__ (" \n\ + .text \n\ + .type __swapcontext_ret, #function \n\ +__swapcontext_ret: \n\ + return %i7 + 8 \n\ + clr %o0 \n\ + .size __swapcontext_ret, .-__swapcontext_ret \n\ + "); + +weak_alias (__swapcontext, swapcontext) |