diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arc/getcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arc/getcontext.S | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arc/getcontext.S b/sysdeps/unix/sysv/linux/arc/getcontext.S new file mode 100644 index 0000000000..486cc622ef --- /dev/null +++ b/sysdeps/unix/sysv/linux/arc/getcontext.S @@ -0,0 +1,64 @@ +/* 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) |