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

   1 /* Save current context and jump to a new context.
   2    Copyright (C) 2002-2017 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    <http://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 #define __CONTEXT_ENABLE_FPRS 1
  29 #define __CONTEXT_ENABLE_VRS 1
  30
  31 /* Size of ucontext in GLIBC_2.3.4 and later.  */
  32 #define _UC_SIZE_2_3_4  1184
  33
  34         .section ".text";
  35 ENTRY (__swapcontext)
  36         li      r5,_UC_SIZE_2_3_4;
  37         DO_CALL (SYS_ify (swapcontext));
  38         bso-    cr0,1f
  39 /* the kernel does not set the return code for the success case */
  40         li      r3,0
  41         blr
  42 1:
  43         b       __syscall_error@local
  44 END(__swapcontext)
  45
  46 versioned_symbol (libc, __swapcontext, swapcontext, GLIBC_2_3_4)
  47
  48 #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
  49
  50         compat_text_section
  51
  52 # undef __CONTEXT_FUNC_NAME
  53 # define __CONTEXT_FUNC_NAME __novec_swapcontext
  54 # undef __CONTEXT_ENABLE_VRS
  55
  56 # include "swapcontext-common.S"
  57
  58         .previous
  59
  60 compat_symbol (libc, __novec_swapcontext, swapcontext, GLIBC_2_3_3)
  61
  62 #endif
  63
  64 #if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_3_3)
  65
  66 # define _ERRNO_H       1
  67 # include <bits/errno.h>
  68
  69         compat_text_section
  70 ENTRY (__swapcontext_stub)
  71         li      r3,ENOSYS
  72         b       __syscall_error@local
  73 END (__swapcontext_stub)
  74         .previous
  75
  76 compat_symbol (libc, __swapcontext_stub, swapcontext, GLIBC_2_1)
  77
  78 #endif