GNU C Library master sources branch google/grte/v5-2.27/master updated. glibc-2.27-153-ge1c1d33

[shebs at sourceware dot org]

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       via  e50d14b607000d7d7ca0ba581f80e851ab101586 (commit)
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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=e1c1d33725d946279400af6d812a339fb9c8fa47

commit e1c1d33725d946279400af6d812a339fb9c8fa47
Author: Stan Shebs <stanshebs@google.com>
Date:   Tue Sep 25 10:52:37 2018 -0700

    Add workaround for infinite looping in ppc vsyscalls

diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c
index 8bc7e81..3f6fdcf 100644
--- a/sysdeps/posix/clock_getres.c
+++ b/sysdeps/posix/clock_getres.c
@@ -73,6 +73,19 @@ realtime_getres (struct timespec *res)
   return -1;
 }
 
+#if defined __clang__ && defined __powerpc64__
+/* On ppc, __clock_getres's body eventually expands into asm code
+   that does a bctrl, but clang does not recognize the need to save
+   the link register, so calls loop infinitely instead of returning.
+   As workaround, make a dummy function call that forces a link
+   register save.  */
+volatile int clock_getres_dummy_glob;
+
+void __attribute__((noinline)) clock_getres_dummy ()
+{
+  clock_getres_dummy_glob = 45;
+}
+#endif
 
 /* Get resolution of clock.  */
 int
@@ -80,6 +93,10 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
 {
   int retval = -1;
 
+#if defined __clang__ && defined __powerpc64__
+  clock_getres_dummy ();
+#endif
+
   switch (clock_id)
     {
 #ifdef SYSDEP_GETRES
diff --git a/sysdeps/unix/clock_gettime.c b/sysdeps/unix/clock_gettime.c
index 96df78a..7ef4330 100644
--- a/sysdeps/unix/clock_gettime.c
+++ b/sysdeps/unix/clock_gettime.c
@@ -86,6 +86,19 @@ realtime_gettime (struct timespec *tp)
   return retval;
 }
 
+#if defined __clang__ && defined __powerpc64__
+/* On ppc, __clock_gettime's body eventually expands into asm code
+   that does a bctrl, but clang does not recognize the need to save
+   the link register, so calls loop infinitely instead of returning.
+   As workaround, make a dummy function call that forces a link
+   register save.  */
+volatile int clock_gettime_dummy_glob;
+
+void __attribute__((noinline)) clock_gettime_dummy ()
+{
+  clock_gettime_dummy_glob = 45;
+}
+#endif
 
 /* Get current value of CLOCK and store it in TP.  */
 int
@@ -93,6 +106,10 @@ __clock_gettime (clockid_t clock_id, struct timespec *tp)
 {
   int retval = -1;
 
+#if defined __clang__ && defined __powerpc64__
+  clock_gettime_dummy ();
+#endif
+
   switch (clock_id)
     {
 #ifdef SYSDEP_GETTIME

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=e50d14b607000d7d7ca0ba581f80e851ab101586

commit e50d14b607000d7d7ca0ba581f80e851ab101586
Author: Stan Shebs <stanshebs@google.com>
Date:   Tue Sep 25 08:04:10 2018 -0700

    Work around clang crash by skipping apparently-unneeded asm

diff --git a/sysdeps/powerpc/powerpc64/backtrace.c b/sysdeps/powerpc/powerpc64/backtrace.c
index c0c4b48..b438560 100644
--- a/sysdeps/powerpc/powerpc64/backtrace.c
+++ b/sysdeps/powerpc/powerpc64/backtrace.c
@@ -70,8 +70,12 @@ __backtrace (void **array, int size)
   struct layout *current;
   int count;
 
+  /* The following asm causes a clang crash, and does not seem to be
+     needed anyway; clang always saves link register.  */
+#if !defined __clang__
   /* Force gcc to spill LR.  */
   asm volatile ("" : "=l"(current));
+#endif
 
   /* Get the address on top-of-stack.  */
   asm volatile ("ld %0,0(1)" : "=r"(current));

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=5c23202b75a11ef95f8e0e95ed67416b4a7be1b2

commit 5c23202b75a11ef95f8e0e95ed67416b4a7be1b2
Author: Stan Shebs <stanshebs@google.com>
Date:   Tue Sep 25 07:58:13 2018 -0700

    Work around clang problem with ifuncs and vdso

diff --git a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
index 994a926..868e091 100644
--- a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
@@ -23,7 +23,7 @@
 
 #include <sys/time.h>
 
-#ifdef SHARED
+#if defined(SHARED) && !defined(__clang__)
 
 # include <dl-vdso.h>
 # include <libc-vdso.h>
diff --git a/sysdeps/unix/sysv/linux/powerpc/time.c b/sysdeps/unix/sysv/linux/powerpc/time.c
index 8814bcc..61965fe 100644
--- a/sysdeps/unix/sysv/linux/powerpc/time.c
+++ b/sysdeps/unix/sysv/linux/powerpc/time.c
@@ -16,7 +16,7 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifdef SHARED
+#if defined(SHARED) && !defined(__clang__)
 # ifndef __powerpc64__
 #  define time __redirect_time
 # else

-----------------------------------------------------------------------

Summary of changes:
 sysdeps/posix/clock_getres.c                   |   17 +++++++++++++++++
 sysdeps/powerpc/powerpc64/backtrace.c          |    4 ++++
 sysdeps/unix/clock_gettime.c                   |   17 +++++++++++++++++
 sysdeps/unix/sysv/linux/powerpc/gettimeofday.c |    2 +-
 sysdeps/unix/sysv/linux/powerpc/time.c         |    2 +-
 5 files changed, 40 insertions(+), 2 deletions(-)


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