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/* Copyright (C) 2018 - 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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"
#if defined(__XTENSA_CALL0_ABI__)
ENTRY(__swapcontext)
s32i a0, a2, MCONTEXT_SC_PC
s32i a1, a2, MCONTEXT_SC_A_0 + 4
/* save callee-saved registers in the context */
s32i a12, a2, MCONTEXT_SC_A_0 + 48
s32i a13, a2, MCONTEXT_SC_A_0 + 52
s32i a14, a2, MCONTEXT_SC_A_0 + 56
s32i a15, a2, MCONTEXT_SC_A_0 + 60
mov a12, a3
mov a13, a2
addi a3, a3, UCONTEXT_SIGMASK
addi a4, a2, UCONTEXT_SIGMASK
movi a2, SIG_SETMASK
movi a5, JUMPTARGET (sigprocmask)
callx0 a5
bnez a2, .Lerror
mov a2, a12
l32i a0, a2, MCONTEXT_SC_PC
l32i a1, a2, MCONTEXT_SC_A_0 + 4
/* load callee-saved registers from the context */
l32i a12, a2, MCONTEXT_SC_A_0 + 48
l32i a13, a2, MCONTEXT_SC_A_0 + 52
l32i a14, a2, MCONTEXT_SC_A_0 + 56
l32i a15, a2, MCONTEXT_SC_A_0 + 60
movi a2, 0
ret
.Lerror:
l32i a0, a13, MCONTEXT_SC_PC
l32i a12, a13, MCONTEXT_SC_A_0 + 48
l32i a13, a13, MCONTEXT_SC_A_0 + 52
ret
END(__swapcontext)
#elif defined(__XTENSA_WINDOWED_ABI__)
ENTRY(__swapcontext)
movi a4, __window_spill
callx4 a4
mov a9, a3
s32i a0, a2, MCONTEXT_SC_PC
/* copy registers a0..a3 from spill area */
addi a3, a1, -16
l32i a4, a3, 0
l32i a5, a3, 4
l32i a6, a3, 8
l32i a7, a3, 12
s32i a4, a2, MCONTEXT_SC_A_0 + 0
s32i a5, a2, MCONTEXT_SC_A_0 + 4
s32i a6, a2, MCONTEXT_SC_A_0 + 8
s32i a7, a2, MCONTEXT_SC_A_0 + 12
/* if it was call4 then register saving is done */
extui a4, a0, 30, 2
bltui a4, 2, 1f
/* otherwise load spill overflow area address into a3 */
addi a3, a5, -16
l32i a3, a3, 4
addi a3, a3, -32
beqi a4, 2, 2f
/* copy registers a8..a11 from spill overflow area */
addi a3, a3, -16
l32i a4, a3, 16
l32i a5, a3, 20
l32i a6, a3, 24
l32i a7, a3, 28
s32i a4, a2, MCONTEXT_SC_A_0 + 32
s32i a5, a2, MCONTEXT_SC_A_0 + 36
s32i a6, a2, MCONTEXT_SC_A_0 + 40
s32i a7, a2, MCONTEXT_SC_A_0 + 44
/* copy registers a4..a7 from spill overflow area */
2:
l32i a4, a3, 0
l32i a5, a3, 4
l32i a6, a3, 8
l32i a7, a3, 12
s32i a4, a2, MCONTEXT_SC_A_0 + 16
s32i a5, a2, MCONTEXT_SC_A_0 + 20
s32i a6, a2, MCONTEXT_SC_A_0 + 24
s32i a7, a2, MCONTEXT_SC_A_0 + 28
1:
movi a6, SIG_SETMASK
addi a7, a9, UCONTEXT_SIGMASK
addi a8, a2, UCONTEXT_SIGMASK
mov a2, a9
movi a4, JUMPTARGET (sigprocmask)
callx4 a4
bnez a6, .Lerror
l32i a0, a2, MCONTEXT_SC_PC
/* copy registers a0..a3 to spill area */
addi a3, a1, -16
l32i a4, a2, MCONTEXT_SC_A_0 + 0
l32i a5, a2, MCONTEXT_SC_A_0 + 4
l32i a6, a2, MCONTEXT_SC_A_0 + 8
l32i a7, a2, MCONTEXT_SC_A_0 + 12
s32i a4, a3, 0
s32i a5, a3, 4
s32i a6, a3, 8
s32i a7, a3, 12
/* if it was call4 then register setup is done */
extui a4, a0, 30, 2
bltui a4, 2, 1f
/* otherwise load spill overflow area address into a3 */
addi a3, a5, -16
l32i a3, a3, 4
addi a3, a3, -32
beqi a4, 2, 2f
/* copy registers a8..a11 to spill overflow area */
addi a3, a3, -16
l32i a4, a2, MCONTEXT_SC_A_0 + 32
l32i a5, a2, MCONTEXT_SC_A_0 + 36
l32i a6, a2, MCONTEXT_SC_A_0 + 40
l32i a7, a2, MCONTEXT_SC_A_0 + 44
s32i a4, a3, 16
s32i a5, a3, 20
s32i a6, a3, 24
s32i a7, a3, 28
/* copy registers a4..a7 to spill overflow area */
2:
l32i a4, a2, MCONTEXT_SC_A_0 + 16
l32i a5, a2, MCONTEXT_SC_A_0 + 20
l32i a6, a2, MCONTEXT_SC_A_0 + 24
l32i a7, a2, MCONTEXT_SC_A_0 + 28
s32i a4, a3, 0
s32i a5, a3, 4
s32i a6, a3, 8
s32i a7, a3, 12
1:
movi a2, 0
retw
.Lerror:
mov a2, a6
retw
END(__swapcontext)
#else
#error Unsupported Xtensa ABI
#endif
weak_alias (__swapcontext, swapcontext)
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