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authorUlrich Drepper <drepper@gmail.com>2011-04-17 21:51:26 -0400
committerUlrich Drepper <drepper@gmail.com>2011-04-17 21:51:26 -0400
commit75ea32abcde4e1699328354e1804ea94560d2950 (patch)
treee8a166eed29a24667460a4759ac4ae84fe95c3a6 /stdlib
parent94409c736b216c405c214c041a33b5fab58bd408 (diff)
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Fix FPU context handling in getcontext on x86-64.
fnstenv on x86-64 seems to clear the state. Work around.
Diffstat (limited to 'stdlib')
-rw-r--r--stdlib/Makefile11
-rw-r--r--stdlib/bug-getcontext.c48
2 files changed, 57 insertions, 2 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile
index bb0661a..04c6ac5 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 1991-2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+# Copyright (C) 1991-2009, 2011 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
@@ -71,7 +71,7 @@ tests := tst-strtol tst-strtod testmb testrand testsort testdiv \
tst-atof1 tst-atof2 tst-strtod2 tst-strtod3 tst-rand48-2 \
tst-makecontext tst-strtod4 tst-strtod5 tst-qsort2 \
tst-makecontext2 tst-strtod6 tst-unsetenv1 \
- tst-makecontext3
+ tst-makecontext3 bug-getcontext
include ../Makeconfig
@@ -145,3 +145,10 @@ $(objpfx)tst-putenv: $(objpfx)tst-putenvmod.so
$(objpfx)tst-putenvmod.so: $(objpfx)tst-putenvmod.os
$(build-module)
CFLAGS-tst-putenvmod.c = -DNOT_IN_libc=1
+
+ifeq ($(build-shared),yes)
+link-libm = $(common-objpfx)math/libm.so
+else
+link-libm = $(common-objpfx)math/libm.a
+endif
+$(objpfx)bug-getcontext: $(link-libm)
diff --git a/stdlib/bug-getcontext.c b/stdlib/bug-getcontext.c
new file mode 100644
index 0000000..745aa1f
--- /dev/null
+++ b/stdlib/bug-getcontext.c
@@ -0,0 +1,48 @@
+/* BZ 12420 */
+
+#include <errno.h>
+#include <fenv.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ucontext.h>
+
+static int
+do_test (void)
+{
+ int except_mask = FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW;
+ int status = feenableexcept (except_mask);
+
+ except_mask = fegetexcept ();
+ if (except_mask == -1)
+ {
+ printf("\nBefore getcontext(): fegetexcept returned: %d\n",
+ except_mask);
+ return 1;
+ }
+
+ ucontext_t ctx;
+ status = getcontext(&ctx);
+ if (status)
+ {
+ printf("\ngetcontext failed, errno: %d.\n", errno);
+ return 1;
+ }
+
+ printf ("\nDone with getcontext()!\n");
+ fflush (NULL);
+
+ int mask = fegetexcept ();
+ if (mask != except_mask)
+ {
+ printf("\nAfter getcontext(): fegetexcept returned: %d, expected: %d.\n",
+ mask, except_mask);
+ return 1;
+ }
+
+ printf("\nAt end fegetexcept() returned %d, expected: %d.\n",
+ mask, except_mask);
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"