| /* Copyright (C) 2001-2014 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 "rtld-global-offsets.h" |
| #include "ucontext_i.h" |
| |
| /* __getcontext (const ucontext_t *ucp) |
| |
| Saves the machine context in UCP such that when it is activated, |
| it appears as if __getcontext() returned again. |
| |
| 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(__getcontext) |
| lr %r1,%r2 |
| |
| /* rt_sigprocmask (SIG_BLOCK, NULL, &sc->sc_mask, sigsetsize). */ |
| la %r2,SIG_BLOCK |
| slr %r3,%r3 |
| la %r4,SC_MASK(%r1) |
| lhi %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) |
| |
| lhi %r2,0 |
| #ifndef __V1_UCONTEXT |
| bras %r3,0f |
| # ifdef IS_IN_rtld |
| /* Within ld.so we can do slightly better by addressing dl_hwap |
| relative to GOT start. */ |
| 1: .long _GLOBAL_OFFSET_TABLE_ - 1b |
| .long C_SYMBOL_NAME(_rtld_global_ro)@GOTOFF |
| 0: l %r4,0(%r3) |
| la %r4,0(%r3,%r4) |
| l %r5,4(%r3) |
| /* _dl_hwcap is 64 bit and we need the lower 32. */ |
| l %r3,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET+4(%r4,%r5) |
| # elif PIC |
| 1: .long _GLOBAL_OFFSET_TABLE_ - 1b |
| .long C_SYMBOL_NAME(_rtld_global_ro)@GOT |
| 0: l %r4,0(%r3) |
| la %r4,0(%r3,%r4) /* GOT pointer -> r4 */ |
| l %r5,4(%r3) /* GOT offset -> r5 */ |
| l %r5,0(%r4,%r5) /* GOT slot -> r5 */ |
| l %r3,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET+4(%r5) |
| # else |
| .long C_SYMBOL_NAME(_dl_hwcap) |
| 0: l %r3,0(%r3) |
| l %r3,0(%r3) |
| # endif |
| tml %r3,512 /* HWCAP_S390_HIGH_GPRS */ |
| jz 2f |
| /* highgprs implies zarch so stmh/oill is ok here. */ |
| .machine "z900" |
| .machinemode "zarch_nohighgprs" |
| stmh %r0,%r15,SC_HIGHGPRS(%r1) |
| oill %r2,1 /* UCONTEXT_UC_FLAGS_HIGH_GPRS */ |
| #endif |
| 2: st %r2,SC_FLGS(%r1) |
| |
| /* Set __getcontext 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) |
| |
| /* Return. */ |
| br %r14 |
| END(__getcontext) |
| |
| weak_alias (__getcontext, getcontext) |
