1/* Save current context. 2 Copyright (C) 2008-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19#include <sysdep.h> 20 21#include "ucontext_i.h" 22 23/* int __getcontext (ucontext_t *ucp) 24 25 Saves the machine context in UCP such that when it is activated, 26 it appears as if __getcontext() returned again. 27 28 This implementation is intended to be used for *synchronous* context 29 switches only. Therefore, it does not have to save anything 30 other than the PRESERVED state. */ 31 32 33ENTRY(__getcontext) 34 save %sp, -112, %sp 35 st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR] 36 37 /* In reality, we only use the GREG_PC value when setting 38 or swapping contexts. But we fill in NPC for completeness. */ 39 add %i7, 8, %o0 40 st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PC] 41 add %o0, 4, %o0 42 st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_NPC] 43 44 rd %y, %o1 45 st %o1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y] 46 47 st %g1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G1] 48 st %g2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2] 49 st %g3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3] 50 st %g4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4] 51 st %g5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5] 52 st %g6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6] 53 st %g7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7] 54 55 mov SIG_BLOCK, %o0 56 clr %o1 57 add %i0, UC_SIGMASK, %o2 58 mov 8, %o3 59 mov __NR_rt_sigprocmask, %g1 60 ta 0x10 61 62 /* Zero, success, return value. */ 63 st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O0] 64 st %i1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1] 65 st %i2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2] 66 st %i3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3] 67 st %i4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4] 68 st %i5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5] 69 st %i6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6] 70 st %i7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O7] 71 72 st %g0, [%i0 + UC_MCONTEXT + MC_GWINS] 73 74 /* Do not save FPU state, it is volatile across calls. */ 75 stb %g0, [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN] 76 77 st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_ID] 78 st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_PTR] 79 jmpl %i7 + 8, %g0 80 restore %g0, %g0, %o0 81END(__getcontext) 82 83weak_alias (__getcontext, getcontext) 84