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/* PowerPC support code for fibers and multithreading.
Copyright (C) 2019 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC 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 General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "../common/threadasm.S"
/**
* Performs a context switch.
*
* r3 - old context pointer
* r4 - new context pointer
*
*/
.text
.globl CSYM(_fiber_switchContext)
.type CSYM(_fiber_switchContext), @function
.align 2
CSYM(_fiber_switchContext):
.cfi_startproc
/* Save linkage area */
mflr 0
mfcr 5
stw 0, 8(1)
stw 5, 4(1)
/* Save GPRs */
stw 11, (-1 * 4)(1)
stw 13, (-2 * 4)(1)
stw 14, (-3 * 4)(1)
stw 15, (-4 * 4)(1)
stw 16, (-5 * 4)(1)
stw 17, (-6 * 4)(1)
stw 18, (-7 * 4)(1)
stw 19, (-8 * 4)(1)
stw 20, (-9 * 4)(1)
stw 21, (-10 * 4)(1)
stw 22, (-11 * 4)(1)
stw 23, (-12 * 4)(1)
stw 24, (-13 * 4)(1)
stw 25, (-14 * 4)(1)
stw 26, (-15 * 4)(1)
stw 27, (-16 * 4)(1)
stw 28, (-17 * 4)(1)
stw 29, (-18 * 4)(1)
stw 30, (-19 * 4)(1)
stwu 31, (-20 * 4)(1)
/* We update the stack pointer here, since we do not want the GC to
scan the floating point registers. */
/* Save FPRs */
stfd 14, (-1 * 8)(1)
stfd 15, (-2 * 8)(1)
stfd 16, (-3 * 8)(1)
stfd 17, (-4 * 8)(1)
stfd 18, (-5 * 8)(1)
stfd 19, (-6 * 8)(1)
stfd 20, (-7 * 8)(1)
stfd 21, (-8 * 8)(1)
stfd 22, (-9 * 8)(1)
stfd 23, (-10 * 8)(1)
stfd 24, (-11 * 8)(1)
stfd 25, (-12 * 8)(1)
stfd 26, (-13 * 8)(1)
stfd 27, (-14 * 8)(1)
stfd 28, (-15 * 8)(1)
stfd 29, (-16 * 8)(1)
stfd 30, (-17 * 8)(1)
stfd 31, (-18 * 8)(1)
/* Update the old stack pointer */
stw 1, 0(3)
/* Set new stack pointer */
addi 1, 4, 20 * 4
/* Restore linkage area */
lwz 0, 8(1)
lwz 5, 4(1)
/* Restore GPRs */
lwz 11, (-1 * 4)(1)
lwz 13, (-2 * 4)(1)
lwz 14, (-3 * 4)(1)
lwz 15, (-4 * 4)(1)
lwz 16, (-5 * 4)(1)
lwz 17, (-6 * 4)(1)
lwz 18, (-7 * 4)(1)
lwz 19, (-8 * 4)(1)
lwz 20, (-9 * 4)(1)
lwz 21, (-10 * 4)(1)
lwz 22, (-11 * 4)(1)
lwz 23, (-12 * 4)(1)
lwz 24, (-13 * 4)(1)
lwz 25, (-14 * 4)(1)
lwz 26, (-15 * 4)(1)
lwz 27, (-16 * 4)(1)
lwz 28, (-17 * 4)(1)
lwz 29, (-18 * 4)(1)
lwz 30, (-19 * 4)(1)
lwz 31, (-20 * 4)(1)
/* Restore FPRs */
lfd 14, (-1 * 8)(4)
lfd 15, (-2 * 8)(4)
lfd 16, (-3 * 8)(4)
lfd 17, (-4 * 8)(4)
lfd 18, (-5 * 8)(4)
lfd 19, (-6 * 8)(4)
lfd 20, (-7 * 8)(4)
lfd 21, (-8 * 8)(4)
lfd 22, (-9 * 8)(4)
lfd 23, (-10 * 8)(4)
lfd 24, (-11 * 8)(4)
lfd 25, (-12 * 8)(4)
lfd 26, (-13 * 8)(4)
lfd 27, (-14 * 8)(4)
lfd 28, (-15 * 8)(4)
lfd 29, (-16 * 8)(4)
lfd 30, (-17 * 8)(4)
lfd 31, (-18 * 8)(4)
/* Set condition and link register */
mtcr 5
mtlr 0
/* Return and switch context */
blr
.cfi_endproc
.size CSYM(_fiber_switchContext),.-CSYM(_fiber_switchContext)
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