| /* Copyright (C) 2002-2014 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 __swapcontextt() 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. */ |
| lgr %r1,%r2 |
| lgr %r0,%r3 |
| |
| /* sigprocmask (SIG_BLOCK, NULL, &sc->sc_mask). */ |
| la %r2,SIG_BLOCK |
| slgr %r3,%r3 |
| la %r4,SC_MASK(%r1) |
| lghi %r5,_NSIG8 |
| svc SYS_ify(rt_sigprocmask) |
| |
| /* 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) |
| |
| /* Store access registers. */ |
| stam %a0,%a15,SC_ACRS(%r1) |
| |
| /* Set __swapcontext return value to 0. */ |
| slgr %r2,%r2 |
| |
| /* Store general purpose registers. */ |
| stmg %r0,%r15,SC_GPRS(%r1) |
| |
| /* Copy uc_flags into the new ucontext_t. */ |
| lgr %r5,%r0 |
| lg %r2,SC_FLGS(%r5) |
| stg %r2,SC_FLGS(%r1) |
| |
| /* rt_sigprocmask (SIG_SETMASK, &sc->sc_mask, NULL, sigsetsize). */ |
| la %r2,SIG_BLOCK |
| la %r3,SC_MASK(%r5) |
| slgr %r4,%r4 |
| lghi %r5,_NSIG8 |
| svc SYS_ify(rt_sigprocmask) |
| |
| /* Load fpu context. */ |
| lgr %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 and %a1, used for thread purposes. */ |
| lam %a2,%a15,SC_ACRS+8(%r5) |
| |
| /* Load general purpose registers. */ |
| lmg %r0,%r15,SC_GPRS(%r5) |
| |
| /* Return. */ |
| br %r14 |
| END(__swapcontext) |
| weak_alias (__swapcontext, swapcontext) |
