Correct return value according to the standard.

sysdeps/alpha/fpu/feholdexcpt.c

@@ -29,5 +29,5 @@ feholdexcept (fenv_t *envp)
   /* Clear all exception status bits and exception enable bits.  */
   __ieee_set_fp_control(0);
 
-  return 1;
+  return 0;
 }

sysdeps/alpha/fpu/fesetround.c

@@ -26,7 +26,7 @@ fesetround (int round)
   unsigned long fpcr;
 
   if (round & ~3)
-    return 0;
+    return 1;
 
   /* Get the current state.  */
   __asm__ __volatile__("excb; mf_fpcr %0" : "=f"(fpcr));
@@ -37,5 +37,5 @@ fesetround (int round)
   /* Put the new state in effect.  */
   __asm__ __volatile__("mt_fpcr %0; excb" : : "f"(fpcr));
 
-  return 1;
+  return 0;
 }

sysdeps/arm/fpu/feholdexcpt.c

@@ -33,5 +33,5 @@ feholdexcept (fenv_t *envp)
   temp &= ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT);
   _FPU_SETCW(temp);
 
-  return 1;
+  return 0;
 }

sysdeps/arm/fpu/fesetround.c

@@ -23,5 +23,5 @@ int
 fesetround (int round)
 {
   /* We only support FE_TONEAREST, so there is no need for any work.  */
-  return (round == FE_TONEAREST)?1:0;
+  return (round == FE_TONEAREST)?0:1;
 }

sysdeps/m68k/fpu/feholdexcpt.c

@@ -35,5 +35,5 @@ feholdexcept (fenv_t *envp)
   fpcr = envp->__control_register & ~(FE_ALL_EXCEPT << 6);
   __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
 
-  return 1;
+  return 0;
 }

sysdeps/m68k/fpu/fesetround.c

@@ -27,12 +27,12 @@ fesetround (int round)
 
   if (round & ~FE_UPWARD)
     /* ROUND is no valid rounding mode.  */
-    return 0;
+    return 1;
 
   __asm__ ("fmove%.l %!,%0" : "=dm" (fpcr));
   fpcr &= ~FE_UPWARD;
   fpcr |= round;
   __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
 
-  return 1;
+  return 0;
 }

sysdeps/mips/fpu/fesetround.c

@@ -28,7 +28,7 @@ fesetround (int round)
 
   if ((round & ~0x3) != 0)
     /* ROUND is no valid rounding mode.  */
-    return 0;
+    return 1;
 
   /* Get current state.  */
   _FPU_GETCW (cw);
@@ -39,5 +39,5 @@ fesetround (int round)
   /* Set new state.  */
   _FPU_SETCW (cw);
 
-  return 1;
+  return 0;
 }