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/* 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)
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