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/* Save and set current context.
Copyright (C) 2009-2022 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 "ucontext-macros.h"
/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
LEAF (__swapcontext)
mv t0, a1 /* Save ucp into t0. */
SAVE_INT_REG (ra, 0, a0)
SAVE_INT_REG (ra, 1, a0)
SAVE_INT_REG (sp, 2, a0)
SAVE_INT_REG (s0, 8, a0)
SAVE_INT_REG (s1, 9, a0)
SAVE_INT_REG (x0, 10, a0) /* return 0 by overwriting a0. */
SAVE_INT_REG (s2, 18, a0)
SAVE_INT_REG (s3, 19, a0)
SAVE_INT_REG (s4, 20, a0)
SAVE_INT_REG (s5, 21, a0)
SAVE_INT_REG (s6, 22, a0)
SAVE_INT_REG (s7, 23, a0)
SAVE_INT_REG (s8, 24, a0)
SAVE_INT_REG (s9, 25, a0)
SAVE_INT_REG (s10, 26, a0)
SAVE_INT_REG (s11, 27, a0)
#ifndef __riscv_float_abi_soft
frsr a1
SAVE_FP_REG (fs0, 8, a0)
SAVE_FP_REG (fs1, 9, a0)
SAVE_FP_REG (fs2, 18, a0)
SAVE_FP_REG (fs3, 19, a0)
SAVE_FP_REG (fs4, 20, a0)
SAVE_FP_REG (fs5, 21, a0)
SAVE_FP_REG (fs6, 22, a0)
SAVE_FP_REG (fs7, 23, a0)
SAVE_FP_REG (fs8, 24, a0)
SAVE_FP_REG (fs9, 25, a0)
SAVE_FP_REG (fs10, 26, a0)
SAVE_FP_REG (fs11, 27, a0)
sw a1, MCONTEXT_FSR(a0)
#endif /* __riscv_float_abi_soft */
/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
li a3, _NSIG8
add a2, a0, UCONTEXT_SIGMASK
add a1, t0, UCONTEXT_SIGMASK
li a0, SIG_SETMASK
li a7, SYS_ify (rt_sigprocmask)
scall
bltz a0, 99f
#ifndef __riscv_float_abi_soft
lw t1, MCONTEXT_FSR(t0)
RESTORE_FP_REG (fs0, 8, t0)
RESTORE_FP_REG (fs1, 9, t0)
RESTORE_FP_REG (fs2, 18, t0)
RESTORE_FP_REG (fs3, 19, t0)
RESTORE_FP_REG (fs4, 20, t0)
RESTORE_FP_REG (fs5, 21, t0)
RESTORE_FP_REG (fs6, 22, t0)
RESTORE_FP_REG (fs7, 23, t0)
RESTORE_FP_REG (fs8, 24, t0)
RESTORE_FP_REG (fs9, 25, t0)
RESTORE_FP_REG (fs10, 26, t0)
RESTORE_FP_REG (fs11, 27, t0)
fssr t1
#endif /* __riscv_float_abi_soft */
/* Note the contents of argument registers will be random
unless makecontext() has been called. */
RESTORE_INT_REG (t1, 0, t0)
RESTORE_INT_REG (ra, 1, t0)
RESTORE_INT_REG (sp, 2, t0)
RESTORE_INT_REG (s0, 8, t0)
RESTORE_INT_REG (s1, 9, t0)
RESTORE_INT_REG (a0, 10, t0)
RESTORE_INT_REG (a1, 11, t0)
RESTORE_INT_REG (a2, 12, t0)
RESTORE_INT_REG (a3, 13, t0)
RESTORE_INT_REG (a4, 14, t0)
RESTORE_INT_REG (a5, 15, t0)
RESTORE_INT_REG (a6, 16, t0)
RESTORE_INT_REG (a7, 17, t0)
RESTORE_INT_REG (s2, 18, t0)
RESTORE_INT_REG (s3, 19, t0)
RESTORE_INT_REG (s4, 20, t0)
RESTORE_INT_REG (s5, 21, t0)
RESTORE_INT_REG (s6, 22, t0)
RESTORE_INT_REG (s7, 23, t0)
RESTORE_INT_REG (s8, 24, t0)
RESTORE_INT_REG (s9, 25, t0)
RESTORE_INT_REG (s10, 26, t0)
RESTORE_INT_REG (s11, 27, t0)
jr t1
99: j __syscall_error
PSEUDO_END (__swapcontext)
weak_alias (__swapcontext, swapcontext)
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