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/* Save current context for ARC.
Copyright (C) 2020 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 getcontext (ucontext_t *ucp)
Save machine context in @ucp and return 0 on success, -1 on error
- saves callee saved registers only
- layout mandated by uncontext_t:uc_mcontext (hence different from setjmp). */
ENTRY (__getcontext)
/* Callee saved registers. */
add r2, r0, UCONTEXT_MCONTEXT
STR (r13, r2, 37)
STR (r14, r2, 36)
STR (r15, r2, 35)
STR (r16, r2, 34)
STR (r17, r2, 33)
STR (r18, r2, 32)
STR (r19, r2, 31)
STR (r20, r2, 30)
STR (r21, r2, 29)
STR (r22, r2, 28)
STR (r23, r2, 27)
STR (r24, r2, 26)
STR (blink, r2, 7)
STR (fp, r2, 8)
STR (gp, r2, 9)
STR (sp, r2, 23)
/* Save 0 in r0 placeholder to return 0 when this @ucp activated. */
mov r9, 0
STR (r9, r2, 22)
/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8). */
mov r3, _NSIG8
add r2, r0, UCONTEXT_SIGMASK
mov r1, 0
mov r0, SIG_BLOCK
mov r8, __NR_rt_sigprocmask
ARC_TRAP_INSN
brhi r0, -1024, L (call_syscall_err)
j.d [blink]
mov r0, 0 /* Success, error handled in .Lcall_syscall_err. */
PSEUDO_END (__getcontext)
weak_alias (__getcontext, getcontext)
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