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119 lines
4.6 KiB
ArmAsm
119 lines
4.6 KiB
ArmAsm
/* Save current context and install the given one.
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Copyright (C) 2008-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David S. Miller <davem@davemloft.net>, 2008.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <sys/trap.h>
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#include "ucontext_i.h"
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/* int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp);
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Saves the machine context in oucp such that when it is activated,
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it appears as if __swapcontext() returned again, restores the
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machine context in ucp and thereby resumes execution in that
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context.
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This implementation is intended to be used for *synchronous* context
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switches only. Therefore, it does not have to save anything
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other than the PRESERVED state. */
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ENTRY(__swapcontext)
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save %sp, -112, %sp
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ta ST_FLUSH_WINDOWS
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st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR]
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add %i7, 8, %o0
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st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PC]
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add %o0, 4, %o0
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st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_NPC]
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rd %y, %o1
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st %o1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y]
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st %g1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G1]
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st %g2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2]
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st %g3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3]
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st %g4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4]
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st %g5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5]
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st %g6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6]
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st %g7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7]
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st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O0]
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st %i1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1]
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st %i2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2]
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st %i3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3]
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st %i4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4]
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st %i5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5]
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st %i6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6]
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st %i7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O7]
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st %g0, [%i0 + UC_MCONTEXT + MC_GWINS]
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stb %g0, [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN]
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st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_ID]
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st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_PTR]
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mov SIG_SETMASK, %o0
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add %i1, UC_SIGMASK, %o1
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add %i0, UC_SIGMASK, %o2
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mov 8, %o3
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mov __NR_rt_sigprocmask, %g1
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ta 0x10
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mov %i1, %i0
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ldub [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN], %g1
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cmp %g1, 0
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be 1f
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nop
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ld [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_FSR], %fsr
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D0], %f0
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D2], %f2
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D4], %f4
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D6], %f6
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D8], %f8
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D10], %f10
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D12], %f12
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D14], %f14
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D16], %f16
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D18], %f18
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D20], %f20
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D22], %f22
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D24], %f24
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D26], %f26
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D28], %f28
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ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D30], %f30
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1:
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y], %g1
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wr %g1, 0x0, %y
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2], %g2
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3], %g3
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4], %g4
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5], %g5
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6], %g6
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7], %g7
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1], %i1
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2], %i2
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3], %i3
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4], %i4
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5], %i5
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ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6], %i6
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restore
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ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O7], %o7
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ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_PC], %g1
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jmpl %g1, %g0
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ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O0], %o0
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END(__swapcontext)
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weak_alias (__swapcontext, swapcontext)
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