diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/swapcontext.S')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/swapcontext.S | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/swapcontext.S b/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/swapcontext.S new file mode 100644 index 0000000000..f08d30cd7f --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/swapcontext.S @@ -0,0 +1,108 @@ +/* Copyright (C) 2002-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Martin Schwidefsky (schwidefsky@de.ibm.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 <sysdep.h> +#include <features.h> + +#include "ucontext_i.h" + +/* __swapcontext (ucontext_t *oucp, const ucontext_t *ucp) + + Saves the machine context in oucp such that when it is activated, + it appears as if __swapcontext() returned again, restores the + machine context in ucp and thereby resumes execution in that + context. + + This implementation is intended to be used for *synchronous* context + switches only. Therefore, it does not have to save anything + other than the PRESERVED state. */ + +ENTRY(__swapcontext) + /* While not part of the ABI a system call never clobbers r0 + or r1. So keeping the values here while calling + rt_sigprocmask is ok. */ + lr %r1,%r2 + lr %r0,%r3 + + /* Store fpu context. */ + stfpc SC_FPC(%r1) + std %f0,SC_FPRS(%r1) + std %f1,SC_FPRS+8(%r1) + std %f2,SC_FPRS+16(%r1) + std %f3,SC_FPRS+24(%r1) + std %f4,SC_FPRS+32(%r1) + std %f5,SC_FPRS+40(%r1) + std %f6,SC_FPRS+48(%r1) + std %f7,SC_FPRS+56(%r1) + std %f8,SC_FPRS+64(%r1) + std %f9,SC_FPRS+72(%r1) + std %f10,SC_FPRS+80(%r1) + std %f11,SC_FPRS+88(%r1) + std %f12,SC_FPRS+96(%r1) + std %f13,SC_FPRS+104(%r1) + std %f14,SC_FPRS+112(%r1) + std %f15,SC_FPRS+120(%r1) + + /* Set __swapcontext return value to 0. */ + slr %r2,%r2 + + /* Store access registers. */ + stam %a0,%a15,SC_ACRS(%r1) + + /* Store general purpose registers. */ + stm %r0,%r15,SC_GPRS(%r1) + + /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, + sigsetsize). */ + la %r2,SIG_SETMASK + lr %r5,%r0 + la %r3,SC_MASK(%r5) + la %r4,SC_MASK(%r1) + lhi %r5,_NSIG8 + svc SYS_ify(rt_sigprocmask) + + /* Load fpu context. */ + lr %r5,%r0 + lfpc SC_FPC(%r5) + ld %f0,SC_FPRS(%r5) + ld %f1,SC_FPRS+8(%r5) + ld %f2,SC_FPRS+16(%r5) + ld %f3,SC_FPRS+24(%r5) + ld %f4,SC_FPRS+32(%r5) + ld %f5,SC_FPRS+40(%r5) + ld %f6,SC_FPRS+48(%r5) + ld %f7,SC_FPRS+56(%r5) + ld %f8,SC_FPRS+64(%r5) + ld %f9,SC_FPRS+72(%r5) + ld %f10,SC_FPRS+80(%r5) + ld %f11,SC_FPRS+88(%r5) + ld %f12,SC_FPRS+96(%r5) + ld %f13,SC_FPRS+104(%r5) + ld %f14,SC_FPRS+112(%r5) + ld %f15,SC_FPRS+120(%r5) + + /* Don't touch %a0, used for thread purposes. */ + lam %a1,%a15,SC_ACRS+4(%r5) + + /* Load general purpose registers. */ + lm %r0,%r15,SC_GPRS(%r5) + + /* Return. */ + br %r14 +END(__swapcontext) +weak_alias (__swapcontext, swapcontext) |