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

   1 /* 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    <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 __setcontext
  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 (__setcontext)
  36         mr      r4,r3
  37         li      r3,0
  38         li      r5,_UC_SIZE_2_3_4;
  39         DO_CALL (SYS_ify (swapcontext));
  40         bso-    cr0,1f
  41 /* the kernel does not set the return code for the success case */
  42         li      r3,0
  43         blr
  44 1:
  45         b       __syscall_error@local
  46 END(__setcontext)
  47
  48 versioned_symbol (libc, __setcontext, setcontext, GLIBC_2_3_4)
  49
  50 #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
  51
  52         compat_text_section
  53
  54 # undef __CONTEXT_FUNC_NAME
  55 # define __CONTEXT_FUNC_NAME __novec_setcontext
  56 # undef __CONTEXT_ENABLE_VRS
  57
  58 # include "setcontext-common.S"
  59
  60         .previous
  61
  62 compat_symbol (libc, __novec_setcontext, setcontext, GLIBC_2_3_3)
  63
  64 #endif
  65
  66 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3_3)
  67
  68 # define _ERRNO_H       1
  69 # include <bits/errno.h>
  70
  71         compat_text_section
  72 ENTRY (__setcontext_stub)
  73         li      r3,ENOSYS
  74         b       __syscall_error@local
  75 END (__setcontext_stub)
  76         .previous
  77
  78 compat_symbol (libc, __setcontext_stub, setcontext, GLIBC_2_0)
  79
  80 #endif