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| author | Ulrich Drepper <drepper@gmail.com> | 2011-04-18 02:51:26 +0100 |
|---|---|---|
| committer | Petr Baudis <pasky@ucw.cz> | 2011-05-27 00:34:37 +0200 |
| commit | 8277fdc1cd54428e54e112db7f5be89303951001 (patch) | |
| tree | c57104842eda4298e94781c1c033823f120b0075 /stdlib | |
| parent | fea332e16416691310088b5c0e6797694c88352b (diff) | |
| download | glibc-8277fdc1cd54428e54e112db7f5be89303951001.zip glibc-8277fdc1cd54428e54e112db7f5be89303951001.tar.gz glibc-8277fdc1cd54428e54e112db7f5be89303951001.tar.bz2 | |
Fix FPU context handling in getcontext on x86-64.
fnstenv on x86-64 seems to clear the state. Work around.
(cherry picked from commit 75ea32abcde4e1699328354e1804ea94560d2950)
Diffstat (limited to 'stdlib')
| -rw-r--r-- | stdlib/Makefile | 11 | ||||
| -rw-r--r-- | stdlib/bug-getcontext.c | 48 |
2 files changed, 57 insertions, 2 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile index d361dd8..6b8e021 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 @@ -70,7 +70,7 @@ tests := tst-strtol tst-strtod testmb testrand testsort testdiv \ test-a64l tst-qsort tst-system testmb2 bug-strtod2 \ 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-makecontext2 tst-strtod6 tst-unsetenv1 bug-getcontext include ../Makeconfig @@ -144,3 +144,10 @@ $(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" |