sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/swapcontext.S

   1 /* Save current context and jump to a new context.
   2    Copyright (C) 2002-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   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.
   9
  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.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20 #include <rtld-global-offsets.h>
  21 #include <shlib-compat.h>
  22
  23 #define __ASSEMBLY__
  24 #include <asm/ptrace.h>
  25 #include "ucontext_i.h"
  26
  27 #define __CONTEXT_FUNC_NAME __swapcontext
  28 #undef __CONTEXT_ENABLE_FPRS
  29 #undef __CONTEXT_ENABLE_VRS
  30
  31 # include "swapcontext-common.S"
  32
  33 versioned_symbol (libc, __swapcontext, swapcontext, GLIBC_2_3_4)
  34
  35 #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
  36
  37 /* For the nofpu case the old/new versions are the same function.  */
  38 strong_alias (__swapcontext, __novec_swapcontext)
  39
  40 compat_symbol (libc, __novec_swapcontext, swapcontext, GLIBC_2_3_3)
  41
  42 #endif
  43
  44 #if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_3_3)
  45
  46 #define _ERRNO_H        1
  47 #include <bits/errno.h>
  48
  49         compat_text_section
  50 ENTRY (__swapcontext_stub)
  51         li      r3,ENOSYS
  52         b       __syscall_error@local
  53 END (__swapcontext_stub)
  54         .previous
  55
  56 compat_symbol (libc, __swapcontext_stub, swapcontext, GLIBC_2_1)
  57
  58 #endif