1 /* Save current context and install the given one.
2 Copyright (C) 2005 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 #include "ucontext_i.h"
24 /* int __swapcontext (ucontext_t *ouc, const ucontext_t *uc); */
31 /* Return value of getcontext. R0 is the only register whose
32 value is not preserved. */
48 /* Save T flag to SR. */
53 /* The return address of getcontext is the restart pc. */
66 /* We need 2 add instruction because oFPUL+4 >= 127. */
108 /* sigprocmask (SIG_SETMASK, &uc->uc_sigmask, &ouc->uc_sigmask). */
115 mov #+SYS_ify(sigprocmask), r3
120 not r1, r1 // r1=0 means r0 = -1 to -4095
121 tst r1, r1 // i.e. error in linux
122 bf .Lswapcontext_restore
124 SYSCALL_ERROR_HANDLER
128 .Lswapcontext_restore:
173 /* Restore T frag. */
176 /* Skip GBR which is used for thread pointer. */
195 cfi_adjust_cfa_offset(4)
196 cfi_rel_offset (r1, 0)
198 cfi_adjust_cfa_offset(4)
199 cfi_rel_offset (r2, 0)
214 PSEUDO_END(__swapcontext)
216 weak_alias (__swapcontext, swapcontext)