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/* Save and set current context. C-SKY ABIV2 version.
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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "ucontext_i.h"
/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
ENTRY (swapcontext)
/* Save params and lr. */
subi sp, 16
stw a0, (sp, 0)
stw a1, (sp, 4)
stw r15, (sp, 8)
/* Call getcontext. */
#ifdef __PIC__
grs t1, .Lgetpc1
.Lgetpc1:
lrw t0, .Lgetpc1@GOTPC
addu t1, t1, t0
lrw t0, __getcontext@GOT
ldr.w t0, (t1, t0 << 0)
jsr t0
#else /* !__PIC__ */
jsri __getcontext
#endif
mov a3, a0 /* Save return value. */
/* Restore params and lr. */
ldw a0, (sp, 0)
ldw a1, (sp, 4)
ldw r15, (sp, 8)
addi sp, 16
cmpnei a3, 0
bt error_exit
/* Fix up LR and the PC. */
stw sp, (a0, MCONTEXT_CSKY_SP)
stw r15, (a0, MCONTEXT_CSKY_LR)
stw r15, (a0, MCONTEXT_CSKY_PC)
/* Set setcontext's arg. */
mov a0, a1
#ifdef __PIC__
grs t1, .Lgetpc2
.Lgetpc2:
lrw a3, .Lgetpc2@GOTPC
addu t1, t1, a3
lrw a3, __setcontext@GOT
ldr.w a3, (t1, a3 << 0)
#else /* __PIC__ */
lrw a3, __setcontext
#endif /* __PIC__ */
jmp a3
error_exit:
jmp r15
END (swapcontext)
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