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https://github.com/autc04/Retro68.git
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151 lines
4.1 KiB
ArmAsm
151 lines
4.1 KiB
ArmAsm
/* PowerPC support code for fibers and multithreading.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "../common/threadasm.S"
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/**
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* Performs a context switch.
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*
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* r3 - old context pointer
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* r4 - new context pointer
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*
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*/
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.text
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.globl CSYM(_fiber_switchContext)
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.type CSYM(_fiber_switchContext), @function
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.align 2
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CSYM(_fiber_switchContext):
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.cfi_startproc
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/* Save linkage area */
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mflr 0
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mfcr 5
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stw 0, 8(1)
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stw 5, 4(1)
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/* Save GPRs */
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stw 11, (-1 * 4)(1)
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stw 13, (-2 * 4)(1)
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stw 14, (-3 * 4)(1)
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stw 15, (-4 * 4)(1)
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stw 16, (-5 * 4)(1)
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stw 17, (-6 * 4)(1)
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stw 18, (-7 * 4)(1)
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stw 19, (-8 * 4)(1)
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stw 20, (-9 * 4)(1)
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stw 21, (-10 * 4)(1)
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stw 22, (-11 * 4)(1)
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stw 23, (-12 * 4)(1)
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stw 24, (-13 * 4)(1)
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stw 25, (-14 * 4)(1)
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stw 26, (-15 * 4)(1)
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stw 27, (-16 * 4)(1)
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stw 28, (-17 * 4)(1)
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stw 29, (-18 * 4)(1)
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stw 30, (-19 * 4)(1)
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stwu 31, (-20 * 4)(1)
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/* We update the stack pointer here, since we do not want the GC to
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scan the floating point registers. */
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/* Save FPRs */
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stfd 14, (-1 * 8)(1)
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stfd 15, (-2 * 8)(1)
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stfd 16, (-3 * 8)(1)
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stfd 17, (-4 * 8)(1)
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stfd 18, (-5 * 8)(1)
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stfd 19, (-6 * 8)(1)
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stfd 20, (-7 * 8)(1)
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stfd 21, (-8 * 8)(1)
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stfd 22, (-9 * 8)(1)
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stfd 23, (-10 * 8)(1)
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stfd 24, (-11 * 8)(1)
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stfd 25, (-12 * 8)(1)
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stfd 26, (-13 * 8)(1)
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stfd 27, (-14 * 8)(1)
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stfd 28, (-15 * 8)(1)
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stfd 29, (-16 * 8)(1)
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stfd 30, (-17 * 8)(1)
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stfd 31, (-18 * 8)(1)
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/* Update the old stack pointer */
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stw 1, 0(3)
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/* Set new stack pointer */
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addi 1, 4, 20 * 4
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/* Restore linkage area */
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lwz 0, 8(1)
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lwz 5, 4(1)
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/* Restore GPRs */
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lwz 11, (-1 * 4)(1)
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lwz 13, (-2 * 4)(1)
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lwz 14, (-3 * 4)(1)
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lwz 15, (-4 * 4)(1)
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lwz 16, (-5 * 4)(1)
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lwz 17, (-6 * 4)(1)
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lwz 18, (-7 * 4)(1)
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lwz 19, (-8 * 4)(1)
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lwz 20, (-9 * 4)(1)
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lwz 21, (-10 * 4)(1)
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lwz 22, (-11 * 4)(1)
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lwz 23, (-12 * 4)(1)
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lwz 24, (-13 * 4)(1)
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lwz 25, (-14 * 4)(1)
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lwz 26, (-15 * 4)(1)
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lwz 27, (-16 * 4)(1)
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lwz 28, (-17 * 4)(1)
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lwz 29, (-18 * 4)(1)
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lwz 30, (-19 * 4)(1)
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lwz 31, (-20 * 4)(1)
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/* Restore FPRs */
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lfd 14, (-1 * 8)(4)
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lfd 15, (-2 * 8)(4)
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lfd 16, (-3 * 8)(4)
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lfd 17, (-4 * 8)(4)
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lfd 18, (-5 * 8)(4)
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lfd 19, (-6 * 8)(4)
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lfd 20, (-7 * 8)(4)
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lfd 21, (-8 * 8)(4)
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lfd 22, (-9 * 8)(4)
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lfd 23, (-10 * 8)(4)
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lfd 24, (-11 * 8)(4)
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lfd 25, (-12 * 8)(4)
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lfd 26, (-13 * 8)(4)
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lfd 27, (-14 * 8)(4)
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lfd 28, (-15 * 8)(4)
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lfd 29, (-16 * 8)(4)
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lfd 30, (-17 * 8)(4)
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lfd 31, (-18 * 8)(4)
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/* Set condition and link register */
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mtcr 5
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mtlr 0
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/* Return and switch context */
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blr
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.cfi_endproc
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.size CSYM(_fiber_switchContext),.-CSYM(_fiber_switchContext)
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