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

   1 /* Jump to a new context.
   2    Copyright (C) 2002-2014 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 #include <kernel-features.h>
  23
  24 #define __ASSEMBLY__
  25 #include <asm/ptrace.h>
  26 #include "ucontext_i.h"
  27
  28 #define __CONTEXT_FUNC_NAME __setcontext
  29 #define __CONTEXT_ENABLE_FPRS 1
  30 #define __CONTEXT_ENABLE_VRS 1
  31
  32 /* Size of ucontext in GLIBC_2.3.4 and later.  */
  33 #define _UC_SIZE_2_3_4  1184
  34
  35         .section ".text";
  36 ENTRY (__setcontext)
  37         mr      r4,r3
  38         li      r3,0
  39         li      r5,_UC_SIZE_2_3_4;
  40         DO_CALL (SYS_ify (swapcontext));
  41         bso-    cr0,1f
  42 /* the kernel does not set the return code for the success case */
  43         li      r3,0
  44         blr
  45 1:
  46         b       __syscall_error@local
  47 END(__setcontext)
  48
  49 versioned_symbol (libc, __setcontext, setcontext, GLIBC_2_3_4)
  50
  51 #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
  52
  53         compat_text_section
  54
  55 # undef __CONTEXT_FUNC_NAME
  56 # define __CONTEXT_FUNC_NAME __novec_setcontext
  57 # undef __CONTEXT_ENABLE_VRS
  58
  59 # include "setcontext-common.S"
  60
  61         .previous
  62
  63 compat_symbol (libc, __novec_setcontext, setcontext, GLIBC_2_3_3)
  64
  65 #endif
  66
  67 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3_3)
  68
  69 # define _ERRNO_H       1
  70 # include <bits/errno.h>
  71
  72         compat_text_section
  73 ENTRY (__setcontext_stub)
  74         li      r3,ENOSYS
  75         b       __syscall_error@local
  76 END (__setcontext_stub)
  77         .previous
  78
  79 compat_symbol (libc, __setcontext_stub, setcontext, GLIBC_2_0)
  80
  81 #endif