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/* Windows i386 support code for fibers and multithreading.
Copyright (C) 2019-2020 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"
#if defined(__x86_64__)
.text
.globl CSYM(fiber_switchContext)
.type CSYM(fiber_switchContext), @function
.align 16
CSYM(fiber_switchContext):
.cfi_startproc
pushq %RBP;
movq %RSP, %RBP;
pushq %RBX;
pushq %R12;
pushq %R13;
pushq %R14;
pushq %R15;
pushq %GS:0;
pushq %GS:8;
pushq %GS:16;
// store oldp
movq %RSP, (%RCX);
// load newp to begin context switch
movq %RDX, %RSP;
// load saved state from new stack
popq %GS:16;
popq %GS:8;
popq %GS:0;
popq %R15;
popq %R14;
popq %R13;
popq %R12;
popq %RBX;
popq %RBP;
// 'return' to complete switch
popq %RCX;
jmp *%RCX;
.cfi_endproc
.size CSYM(fiber_switchContext),.-CSYM(fiber_switchContext)
#elif defined(_X86_)
.text
.globl CSYM(fiber_switchContext)
.type CSYM(fiber_switchContext), @function
.align 16
CSYM(fiber_switchContext):
.cfi_startproc
// Save current stack state.save current stack state
// Standard CDECL prologue.
push %EBP;
mov %ESP, %EBP;
push %EDI;
push %ESI;
push %EBX;
push %FS:0;
push %FS:4;
push %FS:8;
push %EAX;
// store oldp again with more accurate address
mov 8(%EBP), %EAX;
mov %ESP, (%EAX);
// load newp to begin context switch
mov 12(%EBP), %ESP;
// load saved state from new stack
pop %EAX;
pop %FS:8;
pop %FS:4;
pop %FS:0;
pop %EBX;
pop %ESI;
pop %EDI;
pop %EBP;
// 'return' to complete switch
ret;
.cfi_endproc
.size CSYM(fiber_switchContext),.-CSYM(fiber_switchContext)
#endif
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