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author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
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committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /REORG.TODO/sysdeps/unix/sysv/linux/s390/s390-32/swapcontext.S | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.gz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.xz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.zip |
Prepare for radical source tree reorganization. zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
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) |