sysdeps/powerpc/powerpc64/tst-ucontext-ppc64-vscr.c

   1 /* Test if POWER vscr read by ucontext.
   2    Copyright (C) 2018 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 <support/check.h>
  20 #include <sys/auxv.h>
  21 #include <ucontext.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <stdint.h>
  25 #include <altivec.h>
  26
  27 #define SAT 0x1
  28
  29 /* This test is supported only on POWER 5 or higher.  */
  30 #define PPC_CPU_SUPPORTED (PPC_FEATURE_POWER5 | PPC_FEATURE_POWER5_PLUS \
  31                            | PPC_FEATURE_ARCH_2_05 | PPC_FEATURE_ARCH_2_06 \
  32                            | PPC_FEATURE2_ARCH_2_07)
  33 static int
  34 do_test (void)
  35 {
  36
  37   if (!(getauxval(AT_HWCAP2) & PPC_CPU_SUPPORTED))
  38     {
  39       if (!(getauxval(AT_HWCAP) & PPC_CPU_SUPPORTED))
  40       FAIL_UNSUPPORTED("This test is unsupported on POWER < 5\n");
  41     }
  42
  43   uint32_t vscr[4] __attribute__ ((aligned (16)));
  44   uint32_t* vscr_ptr = vscr;
  45   uint32_t vscr_word;
  46   ucontext_t ucp;
  47   __vector unsigned int v0 = {0};
  48   __vector unsigned int v1 = {0};
  49
  50   /* Set SAT bit in VSCR register.  */
  51   asm volatile (".machine push;\n"
  52                 ".machine \"power5\";\n"
  53                 "vspltisb %0,0;\n"
  54                 "vspltisb %1,-1;\n"
  55                 "vpkuwus %0,%0,%1;\n"
  56                 "mfvscr %0;\n"
  57                 "stvx %0,0,%2;\n"
  58                 ".machine pop;"
  59                 : "=v" (v0), "=v" (v1)
  60                 : "r" (vscr_ptr)
  61                 : "memory");
  62 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  63   vscr_word = vscr[0];
  64 #else
  65   vscr_word = vscr[3];
  66 #endif
  67
  68   if ((vscr_word & SAT) != SAT)
  69     {
  70       FAIL_EXIT1("FAIL: SAT bit is not set.\n");
  71     }
  72
  73   if (getcontext (&ucp))
  74     {
  75       FAIL_EXIT1("FAIL: getcontext error\n");
  76     }
  77   if (ucp.uc_mcontext.v_regs->vscr.vscr_word != vscr_word)
  78     {
  79       FAIL_EXIT1("FAIL: ucontext vscr does not match with vscr\n");
  80     }
  81   return 0;
  82 }
  83
  84 #include <support/test-driver.c>