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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:09:42 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:09:42 +0000
commit7d58530341304d403a6626d7f7a1913165fe2f32 (patch)
tree471ef022d415c89ff4b5544a5e0239a9ac45d841 /sysdeps
parentec8c29dc013a5e0ca3330ce5e4ae989e811491e6 (diff)
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Test for stack alignment.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/i386/tst-stack-align.h42
-rw-r--r--sysdeps/unix/sysv/linux/i386/clone.S2
2 files changed, 43 insertions, 1 deletions
diff --git a/sysdeps/i386/tst-stack-align.h b/sysdeps/i386/tst-stack-align.h
new file mode 100644
index 0000000..6297d9f
--- /dev/null
+++ b/sysdeps/i386/tst-stack-align.h
@@ -0,0 +1,42 @@
+/* Copyright (C) 2004 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
+ 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 <stdio.h>
+#include <stdint.h>
+
+typedef struct { int i[4]; } int_al16 __attribute__((aligned (16)));
+
+#define TEST_STACK_ALIGN() \
+ ({ \
+ int_al16 _m; \
+ double _d = 12.0; \
+ long double _ld = 15.0; \
+ int _ret = 0; \
+ printf ("int_al16: %p %zu\n", &_m, __alignof (int_al16)); \
+ if ((((uintptr_t) &_m) & (__alignof (int_al16) - 1)) != 0) \
+ _ret = 1; \
+ \
+ printf ("double: %g %p %zu\n", _d, &_d, __alignof (double)); \
+ if ((((uintptr_t) &_d) & (__alignof (double) - 1)) != 0) \
+ _ret = 1; \
+ \
+ printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, __alignof (long double)); \
+ if ((((uintptr_t) &_ld) & (__alignof (long double) - 1)) != 0) \
+ _ret = 1; \
+ _ret; \
+ })
diff --git a/sysdeps/unix/sysv/linux/i386/clone.S b/sysdeps/unix/sysv/linux/i386/clone.S
index acd43df..c7d31f7 100644
--- a/sysdeps/unix/sysv/linux/i386/clone.S
+++ b/sysdeps/unix/sysv/linux/i386/clone.S
@@ -67,7 +67,7 @@ ENTRY (BP_SYM (__clone))
/* Insert the argument onto the new stack. Make sure the new
thread is started with an alignment of (mod 16). */
andl $0xfffffff0, %ecx
- subl $24,%ecx
+ subl $28,%ecx
movl ARG(%esp),%eax /* no negative argument counts */
movl %eax,12(%ecx)