| 1 | /* Save current context. |
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| 2 | Copyright (C) 2008-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | |
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| 21 | #include "ucontext_i.h" |
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| 22 | |
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| 23 | /* int __getcontext (ucontext_t *ucp) |
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| 24 | |
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| 25 | Saves the machine context in UCP such that when it is activated, |
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| 26 | it appears as if __getcontext() returned again. |
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| 27 | |
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| 28 | This implementation is intended to be used for *synchronous* context |
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| 29 | switches only. Therefore, it does not have to save anything |
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| 30 | other than the PRESERVED state. */ |
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| 31 | |
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| 32 | |
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| 33 | ENTRY(__getcontext) |
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| 34 | save %sp, -112, %sp |
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| 35 | st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR] |
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| 36 | |
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| 37 | /* In reality, we only use the GREG_PC value when setting |
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| 38 | or swapping contexts. But we fill in NPC for completeness. */ |
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| 39 | add %i7, 8, %o0 |
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| 40 | st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PC] |
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| 41 | add %o0, 4, %o0 |
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| 42 | st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_NPC] |
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| 43 | |
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| 44 | rd %y, %o1 |
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| 45 | st %o1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y] |
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| 46 | |
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| 47 | st %g1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G1] |
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| 48 | st %g2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2] |
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| 49 | st %g3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3] |
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| 50 | st %g4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4] |
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| 51 | st %g5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5] |
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| 52 | st %g6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6] |
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| 53 | st %g7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7] |
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| 54 | |
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| 55 | mov SIG_BLOCK, %o0 |
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| 56 | clr %o1 |
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| 57 | add %i0, UC_SIGMASK, %o2 |
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| 58 | mov 8, %o3 |
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| 59 | mov __NR_rt_sigprocmask, %g1 |
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| 60 | ta 0x10 |
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| 61 | |
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| 62 | /* Zero, success, return value. */ |
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| 63 | st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O0] |
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| 64 | st %i1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1] |
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| 65 | st %i2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2] |
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| 66 | st %i3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3] |
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| 67 | st %i4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4] |
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| 68 | st %i5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5] |
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| 69 | st %i6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6] |
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| 70 | st %i7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O7] |
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| 71 | |
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| 72 | st %g0, [%i0 + UC_MCONTEXT + MC_GWINS] |
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| 73 | |
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| 74 | /* Do not save FPU state, it is volatile across calls. */ |
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| 75 | stb %g0, [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN] |
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| 76 | |
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| 77 | st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_ID] |
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| 78 | st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_PTR] |
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| 79 | jmpl %i7 + 8, %g0 |
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| 80 | restore %g0, %g0, %o0 |
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| 81 | END(__getcontext) |
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| 82 | |
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| 83 | weak_alias (__getcontext, getcontext) |
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| 84 | |
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