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Diffstat (limited to 'sysdeps/powerpc/fpu/tst-setcontext-fpscr.c')
-rw-r--r--sysdeps/powerpc/fpu/tst-setcontext-fpscr.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/sysdeps/powerpc/fpu/tst-setcontext-fpscr.c b/sysdeps/powerpc/fpu/tst-setcontext-fpscr.c
new file mode 100644
index 0000000000..973fb3f77a
--- /dev/null
+++ b/sysdeps/powerpc/fpu/tst-setcontext-fpscr.c
@@ -0,0 +1,358 @@
+/* Copyright (C) 2001,2002,2004,2006,2007,2008 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ryan S. Arnold <rsa@us.ibm.com>
+ Sean Curry <spcurry@us.ibm.com>
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ucontext.h>
+#include <unistd.h>
+#include <malloc.h>
+#include <link.h>
+#include <elf.h>
+#include <sysdep.h>
+#include <fpu_control.h>
+
+static ucontext_t ctx[3];
+
+
+volatile int global;
+
+
+static int back_in_main;
+
+
+volatile static ElfW(auxv_t) *auxv = NULL;
+
+ElfW(Addr) query_auxv(int type)
+{
+ FILE *auxv_f;
+ ElfW(auxv_t) auxv_struct;
+ ElfW(auxv_t) *auxv_temp;
+ int i = 0;
+
+ /* if the /proc/self/auxv file has not been manually copied into the heap
+ yet, then do it */
+
+ if(auxv == NULL)
+ {
+ auxv_f = fopen("/proc/self/auxv", "r");
+
+ if(auxv_f == 0)
+ {
+ perror("Error opening file for reading");
+ return 0;
+ }
+ auxv = (ElfW(auxv_t) *)malloc(getpagesize());
+
+ do
+ {
+ fread(&auxv_struct, sizeof(ElfW(auxv_t)), 1, auxv_f);
+ auxv[i] = auxv_struct;
+ i++;
+ } while(auxv_struct.a_type != AT_NULL);
+ }
+
+ auxv_temp = (ElfW(auxv_t) *)auxv;
+ i = 0;
+ do
+ {
+ if(auxv_temp[i].a_type == type)
+ {
+ return auxv_temp[i].a_un.a_val;
+ }
+ i++;
+ } while (auxv_temp[i].a_type != AT_NULL);
+
+ return 0;
+}
+
+typedef unsigned long long di_fpscr_t __attribute__ ((__mode__ (__DI__)));
+typedef unsigned int si_fpscr_t __attribute__ ((__mode__ (__SI__)));
+
+#define _FPSCR_RESERVED 0xfffffff8ffffff04ULL
+
+#define _FPSCR_TEST0_DRN 0x0000000400000000ULL
+#define _FPSCR_TEST0_RN 0x0000000000000003ULL
+
+#define _FPSCR_TEST1_DRN 0x0000000300000000ULL
+#define _FPSCR_TEST1_RN 0x0000000000000002ULL
+
+/* Macros for accessing the hardware control word on Power6[x]. */
+# define _GET_DI_FPSCR(__fpscr) ({ \
+ union { double d; \
+ di_fpscr_t fpscr; } \
+ tmp __attribute__ ((__aligned__(8))); \
+ __asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (tmp.d) : : "fr0"); \
+ (__fpscr)=tmp.fpscr; \
+ tmp.fpscr; })
+
+# define _SET_DI_FPSCR(__fpscr) { \
+ union { double d; di_fpscr_t fpscr; } \
+ tmp __attribute__ ((__aligned__(8))); \
+ tmp.fpscr = __fpscr; \
+ /* Set the entire 64-bit FPSCR. */ \
+ __asm__ ("lfd%U0 0,%0; mtfsf 255,0,1,0" : : "m" (tmp.d) : "fr0"); \
+}
+
+# define _GET_SI_FPSCR(__fpscr) ({ \
+ union { double d; \
+ si_fpscr_t cw[2]; } \
+ tmp __attribute__ ((__aligned__(8))); \
+ __asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (tmp.d) : : "fr0"); \
+ (__fpscr)=tmp.cw[1]; \
+ tmp.cw[0]; })
+
+# define _SET_SI_FPSCR(__fpscr) { \
+ union { double d; si_fpscr_t fpscr[2]; } \
+ tmp __attribute__ ((__aligned__(8))); \
+ /* More-or-less arbitrary; this is a QNaN. */ \
+ tmp.fpscr[0] = 0xFFF80000; \
+ tmp.fpscr[1] = __fpscr; \
+ __asm__ ("lfd%U0 0,%0; mtfsf 255,0" : : "m" (tmp.d) : "fr0"); \
+}
+
+void prime_special_regs(int which)
+{
+ ElfW(Addr) a_val;
+
+ di_fpscr_t di_fpscr __attribute__ ((__aligned__(8)));
+
+ a_val = query_auxv(AT_HWCAP);
+ if(a_val == -1)
+ {
+ puts ("querying the auxv for the hwcap failed");
+ _exit (1);
+ }
+
+ /* Indicates a 64-bit FPSCR. */
+ if (a_val & PPC_FEATURE_HAS_DFP)
+ {
+ _GET_DI_FPSCR(di_fpscr);
+
+ /* Overwrite the existing DRN and RN if there is one. */
+ if (which == 0)
+ di_fpscr = ((di_fpscr & _FPSCR_RESERVED) | (_FPSCR_TEST0_DRN | _FPSCR_TEST0_RN));
+ else
+ di_fpscr = ((di_fpscr & _FPSCR_RESERVED) | (_FPSCR_TEST1_DRN | _FPSCR_TEST1_RN));
+ puts ("Priming 64-bit FPSCR with:");
+ printf("0x%.16llx\n",(unsigned long long int)di_fpscr);
+
+ _SET_DI_FPSCR(di_fpscr);
+ }
+ else
+ {
+ puts ("32-bit FPSCR found and will be tested.");
+ _GET_SI_FPSCR(di_fpscr);
+
+ /* Overwrite the existing RN if there is one. */
+ if (which == 0)
+ di_fpscr = ((di_fpscr & _FPSCR_RESERVED) | (_FPSCR_TEST0_RN));
+ else
+ di_fpscr = ((di_fpscr & _FPSCR_RESERVED) | (_FPSCR_TEST1_RN));
+ puts ("Priming 32-bit FPSCR with:");
+ printf("0x%.8lx\n",(unsigned long int) di_fpscr);
+
+ _SET_SI_FPSCR(di_fpscr);
+ }
+}
+
+void clear_special_regs(void)
+{
+ ElfW(Addr) a_val;
+
+ di_fpscr_t di_fpscr __attribute__ ((__aligned__(8)));
+
+ union {
+ double d;
+ unsigned long long int lli;
+ unsigned int li[2];
+ } dlli;
+
+ a_val = query_auxv(AT_HWCAP);
+ if(a_val == -1)
+ {
+ puts ("querying the auxv for the hwcap failed");
+ _exit (1);
+ }
+
+#if __WORDSIZE == 32
+ dlli.d = ctx[0].uc_mcontext.uc_regs->fpregs.fpscr;
+#else
+ dlli.d = ctx[0].uc_mcontext.fp_regs[32];
+#endif
+
+ puts("The FPSCR value saved in the ucontext_t is:");
+
+ /* Indicates a 64-bit FPSCR. */
+ if (a_val & PPC_FEATURE_HAS_DFP)
+ {
+ printf("0x%.16llx\n",dlli.lli);
+ di_fpscr = 0x0;
+ puts ("Clearing the 64-bit FPSCR to:");
+ printf("0x%.16llx\n",(unsigned long long int) di_fpscr);
+
+ _SET_DI_FPSCR(di_fpscr);
+ }
+ else
+ {
+ printf("0x%.8x\n",(unsigned int) dlli.li[1]);
+ di_fpscr = 0x0;
+ puts ("Clearing the 32-bit FPSCR to:");
+ printf("0x%.8lx\n",(unsigned long int) di_fpscr);
+
+ _SET_SI_FPSCR(di_fpscr);
+ }
+}
+
+void test_special_regs(int which)
+{
+ ElfW(Addr) a_val;
+ unsigned long long int test;
+
+ di_fpscr_t di_fpscr __attribute__ ((__aligned__(8)));
+
+ a_val = query_auxv(AT_HWCAP);
+ if(a_val == -1)
+ {
+ puts ("querying the auxv for the hwcap failed");
+ _exit (2);
+ }
+
+ /* Indicates a 64-bit FPSCR. */
+ if (a_val & PPC_FEATURE_HAS_DFP)
+ {
+ _GET_DI_FPSCR(di_fpscr);
+
+ if (which == 0)
+ puts ("After setcontext the 64-bit FPSCR contains:");
+ else
+ puts ("After swapcontext the 64-bit FPSCR contains:");
+
+ printf("0x%.16llx\n",(unsigned long long int) di_fpscr);
+ test = (_FPSCR_TEST0_DRN | _FPSCR_TEST0_RN);
+ if((di_fpscr & (test)) != (test))
+ {
+ printf ("%s: DRN and RN bits set before getcontext were not preserved across [set|swap]context call: %m",__FUNCTION__);
+ _exit (3);
+ }
+ }
+ else
+ {
+ _GET_SI_FPSCR(di_fpscr);
+ if (which == 0)
+ puts ("After setcontext the 32-bit FPSCR contains:");
+ else
+ puts ("After swapcontext the 32-bit FPSCR contains:");
+
+ printf("0x%.8lx\n",(unsigned long int) di_fpscr);
+ test = _FPSCR_TEST0_RN;
+ if((di_fpscr & test) != test)
+ {
+ printf ("%s: RN bit set before getcontext was not preserved across [set|swap]context call: %m",__FUNCTION__);
+ _exit (4);
+ }
+ }
+}
+
+
+static void
+check_called (void)
+{
+ if (back_in_main == 0)
+ {
+ puts ("program did not reach main again");
+ _exit (5);
+ }
+}
+
+
+int
+main (void)
+{
+ atexit (check_called);
+
+ puts ("priming the FPSCR with a marker");
+ prime_special_regs (0);
+
+ puts ("making contexts");
+ if (getcontext (&ctx[0]) != 0)
+ {
+ if (errno == ENOSYS)
+ {
+ back_in_main = 1;
+ exit (0);
+ }
+
+ printf ("%s: getcontext: %m\n", __FUNCTION__);
+ exit (6);
+ }
+
+ /* Play some tricks with this context. */
+ if (++global == 1)
+ {
+ clear_special_regs ( );
+ if (setcontext (&ctx[0]) != 0)
+ {
+ printf ("%s: setcontext: %m\n", __FUNCTION__);
+ exit (7);
+ }
+ }
+ if (global != 2)
+ {
+ printf ("%s: 'global' not incremented twice\n", __FUNCTION__);
+ exit (8);
+ }
+
+ test_special_regs (0);
+
+ global = 0;
+ if (getcontext (&ctx[0]) != 0)
+ {
+ printf ("%s: getcontext: %m\n", __FUNCTION__);
+ exit (9);
+ }
+
+ if (++global == 1)
+ {
+ puts ("priming the FPSCR with a marker");
+ prime_special_regs (1);
+
+ puts ("swapping contexts");
+ if (swapcontext (&ctx[1], &ctx[0]) != 0)
+ {
+ printf ("%s: swapcontext: %m\n", __FUNCTION__);
+ exit (9);
+ }
+ }
+ if (global != 2)
+ {
+ printf ("%s: 'global' not incremented twice\n", __FUNCTION__);
+ exit (10);
+ }
+
+ test_special_regs (1);
+
+ puts ("back at main program");
+ back_in_main = 1;
+
+ puts ("test succeeded");
+ return 0;
+}
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