/* Save current context. Copyright (C) 2008-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by David S. Miller <davem@davemloft.net>, 2008. 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 "ucontext_i.h" /* int __getcontext (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) save %sp, -112, %sp st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR] /* In reality, we only use the GREG_PC value when setting or swapping contexts. But we fill in NPC for completeness. */ add %i7, 8, %o0 st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PC] add %o0, 4, %o0 st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_NPC] rd %y, %o1 st %o1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y] st %g1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G1] st %g2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2] st %g3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3] st %g4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4] st %g5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5] st %g6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6] st %g7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7] mov SIG_BLOCK, %o0 clr %o1 add %i0, UC_SIGMASK, %o2 mov 8, %o3 mov __NR_rt_sigprocmask, %g1 ta 0x10 /* Zero, success, return value. */ st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O0] st %i1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1] st %i2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2] st %i3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3] st %i4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4] st %i5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5] st %i6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6] st %i7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O7] st %g0, [%i0 + UC_MCONTEXT + MC_GWINS] /* Do not save FPU state, it is volatile across calls. */ stb %g0, [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN] st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_ID] st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_PTR] jmpl %i7 + 8, %g0 restore %g0, %g0, %o0 END(__getcontext) weak_alias (__getcontext, getcontext)