[COMMITTED] Add round-mode context support to sparc.

diff --git a/ChangeLog b/ChangeLog
index 44ddb28..72cc597 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,26 @@ 
 2014-04-30  David S. Miller  <davem@davemloft.net>
 
+	* sysdeps/sparc/fpu/fenv_private.h (HAVE_RM_CTX): Define.
+	(libc_feholdexcept_setround_sparc_ctx): New function.
+	(libc_fesetenv_sparc_ctx): Likewise.
+	(libc_feupdateenv_sparc_ctx): Likewise.
+	(libc_feholdsetround_sparc_ctx): Likewise.
+	(libc_feholdexcept_setround_ctx): Define.
+	(libc_feholdexcept_setroundf_ctx): Likewise.
+	(libc_feholdexcept_setroundl_ctx): Likewise.
+	(libc_fesetenv_ctx): Likewise.
+	(libc_fesetenvf_ctx): Likewise.
+	(libc_fesetenvl_ctx): Likewise.
+	(libc_feupdateenv_ctx): Likewise.
+	(libc_feupdateenvf_ctx): Likewise.
+	(libc_feupdateenvl_ctx): Likewise.
+	(libc_feresetround_ctx): Likewise.
+	(libc_feresetroundf_ctx): Likewise.
+	(libc_feresetroundl_ctx): Likewise.
+	(libc_feholdsetround_ctx): Likewise.
+	(libc_feholdsetroundf_ctx): Likewise.
+	(libc_feholdsetroundl_ctx): Likewise.
+
 	* sysdeps/unix/sysv/linux/sparc/bits/siginfo.h (EMT_TAGOVF): Protect
 	with __USE_GNU instead of XOPEN cpp guards.
 
diff --git a/sysdeps/sparc/fpu/fenv_private.h b/sysdeps/sparc/fpu/fenv_private.h
index 8690879..29b5d12 100644
--- a/sysdeps/sparc/fpu/fenv_private.h
+++ b/sysdeps/sparc/fpu/fenv_private.h
@@ -115,4 +115,68 @@  libc_feresetround (fenv_t *e)
 #define libc_feholdsetroundl		libc_feholdsetround
 #define libc_feresetroundl		libc_feresetround
 
+/* We have support for rounding mode context.  */
+#define HAVE_RM_CTX 1
+
+static __always_inline void
+libc_feholdexcept_setround_sparc_ctx (struct rm_ctx *ctx, int round)
+{
+  fenv_t new;
+
+  __fenv_stfsr(ctx->env);
+  new = ctx->env & ~((0x1f << 23) | FE_ALL_EXCEPT);
+  new = (new & ~__FE_ROUND_MASK) | round;
+  if (__glibc_unlikely (new != ctx->env))
+    {
+      __fenv_ldfsr(new);
+      ctx->updated_status = true;
+    }
+  else
+    ctx->updated_status = false;
+}
+
+static __always_inline void
+libc_fesetenv_sparc_ctx (struct rm_ctx *ctx)
+{
+  libc_fesetenv(&ctx->env);
+}
+
+static __always_inline void
+libc_feupdateenv_sparc_ctx (struct rm_ctx *ctx)
+{
+  if (__glibc_unlikely (ctx->updated_status))
+    libc_feupdateenv_test (&ctx->env, 0);
+}
+
+static __always_inline void
+libc_feholdsetround_sparc_ctx (struct rm_ctx *ctx, int round)
+{
+  fenv_t new;
+
+  __fenv_stfsr(ctx->env);
+  new = (ctx->env & ~__FE_ROUND_MASK) | round;
+  if (__glibc_unlikely (new != ctx->env))
+    {
+      __fenv_ldfsr(new);
+      ctx->updated_status = true;
+    }
+  else
+    ctx->updated_status = false;
+}
+#define libc_feholdexcept_setround_ctx   libc_feholdexcept_setround_sparc_ctx
+#define libc_feholdexcept_setroundf_ctx  libc_feholdexcept_setround_sparc_ctx
+#define libc_feholdexcept_setroundl_ctx  libc_feholdexcept_setround_sparc_ctx
+#define libc_fesetenv_ctx                libc_fesetenv_sparc_ctx
+#define libc_fesetenvf_ctx               libc_fesetenv_sparc_ctx
+#define libc_fesetenvl_ctx               libc_fesetenv_sparc_ctx
+#define libc_feupdateenv_ctx             libc_feupdateenv_sparc_ctx
+#define libc_feupdateenvf_ctx            libc_feupdateenv_sparc_ctx
+#define libc_feupdateenvl_ctx            libc_feupdateenv_sparc_ctx
+#define libc_feresetround_ctx            libc_feupdateenv_sparc_ctx
+#define libc_feresetroundf_ctx           libc_feupdateenv_sparc_ctx
+#define libc_feresetroundl_ctx           libc_feupdateenv_sparc_ctx
+#define libc_feholdsetround_ctx          libc_feholdsetround_sparc_ctx
+#define libc_feholdsetroundf_ctx         libc_feholdsetround_sparc_ctx
+#define libc_feholdsetroundl_ctx         libc_feholdsetround_sparc_ctx
+
 #endif /* FENV_PRIVATE_H */