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306 lines
9.5 KiB
306 lines
9.5 KiB
commit bc79db3fd487daea36e7c130f943cfb9826a41b4
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Wed Feb 6 09:06:34 2019 +0100
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Fix alignment of TLS variables for tls variant TLS_TCB_AT_TP [BZ #23403]
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The alignment of TLS variables is wrong if accessed from within a thread
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for architectures with tls variant TLS_TCB_AT_TP.
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For the main thread the static tls data is properly aligned.
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For other threads the alignment depends on the alignment of the thread
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pointer as the static tls data is located relative to this pointer.
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This patch adds this alignment for TLS_TCB_AT_TP variants in the same way
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as it is already done for TLS_DTV_AT_TP. The thread pointer is also already
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properly aligned if the user provides its own stack for the new thread.
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This patch extends the testcase nptl/tst-tls1.c in order to check the
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alignment of the tls variables and it adds a pthread_create invocation
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with a user provided stack.
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The test itself is migrated from test-skeleton.c to test-driver.c
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and the missing support functions xpthread_attr_setstack and xposix_memalign
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are added.
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ChangeLog:
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[BZ #23403]
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* nptl/allocatestack.c (allocate_stack): Align pointer pd for
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TLS_TCB_AT_TP tls variant.
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* nptl/tst-tls1.c: Migrate to support/test-driver.c.
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Add alignment checks.
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* support/Makefile (libsupport-routines): Add xposix_memalign and
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xpthread_setstack.
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* support/support.h: Add xposix_memalign.
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* support/xthread.h: Add xpthread_attr_setstack.
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* support/xposix_memalign.c: New File.
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* support/xpthread_attr_setstack.c: Likewise.
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diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
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index 670cb8ffe6..590350647b 100644
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--- a/nptl/allocatestack.c
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+++ b/nptl/allocatestack.c
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@@ -572,7 +572,9 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
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/* Place the thread descriptor at the end of the stack. */
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#if TLS_TCB_AT_TP
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- pd = (struct pthread *) ((char *) mem + size) - 1;
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+ pd = (struct pthread *) ((((uintptr_t) mem + size)
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+ - TLS_TCB_SIZE)
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+ & ~__static_tls_align_m1);
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#elif TLS_DTV_AT_TP
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pd = (struct pthread *) ((((uintptr_t) mem + size
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- __static_tls_size)
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diff --git a/nptl/tst-tls1.c b/nptl/tst-tls1.c
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index 00489e23e9..1a915224a7 100644
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--- a/nptl/tst-tls1.c
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+++ b/nptl/tst-tls1.c
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@@ -19,12 +19,16 @@
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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-
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+#include <stdint.h>
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+#include <inttypes.h>
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+#include <support/support.h>
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+#include <support/check.h>
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+#include <support/xthread.h>
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struct test_s
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{
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- int a;
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- int b;
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+ __attribute__ ((aligned(0x20))) int a;
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+ __attribute__ ((aligned(0x200))) int b;
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};
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#define INIT_A 1
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@@ -36,15 +40,34 @@ __thread struct test_s s __attribute__ ((tls_model ("initial-exec"))) =
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.b = INIT_B
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};
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+/* Use noinline in combination with not static to ensure that the
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+ alignment check is really done. Otherwise it was optimized out! */
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+__attribute__ ((noinline)) void
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+check_alignment (const char *thr_name, const char *ptr_name,
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+ int *ptr, int alignment)
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+{
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+ uintptr_t offset_aligment = ((uintptr_t) ptr) & (alignment - 1);
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+ if (offset_aligment)
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+ {
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+ FAIL_EXIT1 ("%s (%p) is not 0x%x-byte aligned in %s thread\n",
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+ ptr_name, ptr, alignment, thr_name);
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+ }
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+}
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+
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+static void
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+check_s (const char *thr_name)
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+{
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+ if (s.a != INIT_A || s.b != INIT_B)
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+ FAIL_EXIT1 ("initial value of s in %s thread wrong\n", thr_name);
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+
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+ check_alignment (thr_name, "s.a", &s.a, 0x20);
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+ check_alignment (thr_name, "s.b", &s.b, 0x200);
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+}
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static void *
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tf (void *arg)
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{
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- if (s.a != INIT_A || s.b != INIT_B)
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- {
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- puts ("initial value of s in child thread wrong");
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- exit (1);
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- }
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+ check_s ("child");
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++s.a;
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@@ -55,25 +78,14 @@ tf (void *arg)
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int
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do_test (void)
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{
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- if (s.a != INIT_A || s.b != INIT_B)
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- {
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- puts ("initial value of s in main thread wrong");
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- exit (1);
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- }
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+ check_s ("main");
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pthread_attr_t a;
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- if (pthread_attr_init (&a) != 0)
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- {
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- puts ("attr_init failed");
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- exit (1);
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- }
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+ xpthread_attr_init (&a);
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- if (pthread_attr_setstacksize (&a, 1 * 1024 * 1024) != 0)
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- {
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- puts ("attr_setstacksize failed");
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- return 1;
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- }
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+#define STACK_SIZE (1 * 1024 * 1024)
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+ xpthread_attr_setstacksize (&a, STACK_SIZE);
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#define N 10
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int i;
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@@ -83,29 +95,25 @@ do_test (void)
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pthread_t th[M];
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int j;
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for (j = 0; j < M; ++j, ++s.a)
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- if (pthread_create (&th[j], &a, tf, NULL) != 0)
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- {
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- puts ("pthread_create failed");
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- exit (1);
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- }
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+ th[j] = xpthread_create (&a, tf, NULL);
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for (j = 0; j < M; ++j)
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- if (pthread_join (th[j], NULL) != 0)
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- {
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- puts ("pthread_join failed");
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- exit (1);
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- }
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+ xpthread_join (th[j]);
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}
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- if (pthread_attr_destroy (&a) != 0)
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- {
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- puts ("attr_destroy failed");
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- exit (1);
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- }
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+ /* Also check the alignment of the tls variables if a misaligned stack is
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+ specified. */
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+ pthread_t th;
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+ void *thr_stack = NULL;
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+ thr_stack = xposix_memalign (0x200, STACK_SIZE + 1);
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+ xpthread_attr_setstack (&a, thr_stack + 1, STACK_SIZE);
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+ th = xpthread_create (&a, tf, NULL);
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+ xpthread_join (th);
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+ free (thr_stack);
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+
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+ xpthread_attr_destroy (&a);
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return 0;
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}
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-
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-#define TEST_FUNCTION do_test ()
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-#include "../test-skeleton.c"
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+#include <support/test-driver.c>
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diff --git a/support/Makefile b/support/Makefile
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index c15b93647c..9ff0ec3fff 100644
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--- a/support/Makefile
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+++ b/support/Makefile
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@@ -99,10 +99,12 @@ libsupport-routines = \
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xopen \
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xpipe \
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xpoll \
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+ xposix_memalign \
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xpthread_attr_destroy \
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xpthread_attr_init \
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xpthread_attr_setdetachstate \
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xpthread_attr_setguardsize \
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+ xpthread_attr_setstack \
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xpthread_attr_setstacksize \
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xpthread_barrier_destroy \
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xpthread_barrier_init \
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diff --git a/support/support.h b/support/support.h
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index 119495e5a9..97fef2cd23 100644
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--- a/support/support.h
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+++ b/support/support.h
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@@ -86,6 +86,7 @@ int support_descriptor_supports_holes (int fd);
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void *xmalloc (size_t) __attribute__ ((malloc));
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void *xcalloc (size_t n, size_t s) __attribute__ ((malloc));
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void *xrealloc (void *p, size_t n);
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+void *xposix_memalign (size_t alignment, size_t n);
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char *xasprintf (const char *format, ...)
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__attribute__ ((format (printf, 1, 2), malloc));
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char *xstrdup (const char *);
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diff --git a/support/xposix_memalign.c b/support/xposix_memalign.c
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new file mode 100644
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index 0000000000..5501a0846a
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--- /dev/null
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+++ b/support/xposix_memalign.c
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@@ -0,0 +1,35 @@
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+/* Error-checking wrapper for posix_memalign.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#include <support/support.h>
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+#include <stdlib.h>
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+#include <errno.h>
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+
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+void *
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+xposix_memalign (size_t alignment, size_t n)
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+{
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+ void *p = NULL;
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+
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+ int ret = posix_memalign (&p, alignment, n);
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+ if (ret)
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+ {
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+ errno = ret;
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+ oom_error ("posix_memalign", n);
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+ }
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+ return p;
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+}
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diff --git a/support/xpthread_attr_setstack.c b/support/xpthread_attr_setstack.c
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new file mode 100644
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index 0000000000..c3772e240b
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--- /dev/null
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+++ b/support/xpthread_attr_setstack.c
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@@ -0,0 +1,26 @@
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+/* pthread_attr_setstack with error checking.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#include <support/xthread.h>
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+
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+void
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+xpthread_attr_setstack (pthread_attr_t *attr, void *stackaddr, size_t stacksize)
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+{
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+ xpthread_check_return ("pthread_attr_setstack",
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+ pthread_attr_setstack (attr, stackaddr, stacksize));
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+}
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diff --git a/support/xthread.h b/support/xthread.h
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index 9fe1f68b3b..5204f78ed2 100644
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--- a/support/xthread.h
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+++ b/support/xthread.h
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@@ -68,6 +68,8 @@ void xpthread_attr_destroy (pthread_attr_t *attr);
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void xpthread_attr_init (pthread_attr_t *attr);
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void xpthread_attr_setdetachstate (pthread_attr_t *attr,
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int detachstate);
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+void xpthread_attr_setstack (pthread_attr_t *attr, void *stackaddr,
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+ size_t stacksize);
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void xpthread_attr_setstacksize (pthread_attr_t *attr,
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size_t stacksize);
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void xpthread_attr_setguardsize (pthread_attr_t *attr,
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