GNU C Library master sources branch google/grte/v5-2.27/master updated. glibc-2.27-150-g91f441a

[shebs at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=91f441abb64ef8b51f6d99a227ded8ed3d1a1880

commit 91f441abb64ef8b51f6d99a227ded8ed3d1a1880
Author: Stan Shebs <stanshebs@google.com>
Date:   Tue Sep 25 07:48:20 2018 -0700

    Work around a ppc clang inlining bug

diff --git a/sysdeps/pthread/aio_misc.c b/sysdeps/pthread/aio_misc.c
index fb13d62..8d4a258 100644
--- a/sysdeps/pthread/aio_misc.c
+++ b/sysdeps/pthread/aio_misc.c
@@ -27,6 +27,9 @@
 #include <sys/param.h>
 #include <sys/stat.h>
 #include <sys/time.h>
+#if defined __clang__ && defined __powerpc64__
+#define UGLY_INLINE_HACK
+#endif
 #include <aio_misc.h>
 
 #ifndef aio_create_helper_thread
diff --git a/sysdeps/unix/sysv/linux/aio_misc.h b/sysdeps/unix/sysv/linux/aio_misc.h
index 0d8aa45..f463c8f 100644
--- a/sysdeps/unix/sysv/linux/aio_misc.h
+++ b/sysdeps/unix/sysv/linux/aio_misc.h
@@ -35,7 +35,13 @@ __aio_start_notify_thread (void)
   INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, NULL, _NSIG / 8);
 }
 
-extern inline int
+extern
+/* clang fails to inline properly in one case, and then linking fails
+   because the function was discarded, so ensure it's kept.  */
+#ifndef UGLY_INLINE_HACK
+inline
+#endif
+int
 __aio_create_helper_thread (pthread_t *threadp, void *(*tf) (void *),
 			    void *arg)
 {

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=0bcfc18228942c42f1781eed90a16741876a90ca

commit 0bcfc18228942c42f1781eed90a16741876a90ca
Author: Stan Shebs <stanshebs@google.com>
Date:   Tue Sep 25 07:20:18 2018 -0700

    Add workaround for segfaults in __longjmp when compiled with ppc clang

diff --git a/elf/dl-error-skeleton.c b/elf/dl-error-skeleton.c
index d5f418a..01870c5 100644
--- a/elf/dl-error-skeleton.c
+++ b/elf/dl-error-skeleton.c
@@ -85,6 +85,21 @@ fatal_error (int errcode, const char *objname, const char *occasion,
 		     : ""));
 }
 
+/* Due to a complicated set of interactions with different symbol
+   versions, presumably including a VMX-specific __vmx__longjmp, PPC
+   clang ends calling __longjump with ld.so through the global entry
+   point (+0x0) instead of via the local entry point (+0x8) which
+   results in ld.so exceptions crashing because the TOC is not set up.
+   The hack here simply calls the function through a pointer, which
+   guarantees that the global entry point has the TOC set up.  (This
+   may or may not be a clang bug, the symbol aliasing is tricky and
+   literally affects only __longjmp out of all the symbols in
+   libc.)  */
+#if defined __clang__ && defined __powerpc64__
+volatile void (*longjmpptr) (struct __jmp_buf_tag __env[1], int __val)
+__attribute__ ((__nothrow__)) __attribute__ ((__noreturn__)) = __longjmp;
+#endif
+
 void
 _dl_signal_exception (int errcode, struct dl_exception *exception,
 		      const char *occasion)
@@ -96,7 +111,11 @@ _dl_signal_exception (int errcode, struct dl_exception *exception,
       *lcatch->errcode = errcode;
 
       /* We do not restore the signal mask because none was saved.  */
+#if defined __clang__ && defined __powerpc64__
+      (*longjmpptr) (lcatch->env[0].__jmpbuf, 1);
+#else
       __longjmp (lcatch->env[0].__jmpbuf, 1);
+#endif
     }
   else
     fatal_error (errcode, exception->objname, occasion, exception->errstring);
@@ -118,7 +137,11 @@ _dl_signal_error (int errcode, const char *objname, const char *occation,
       *lcatch->errcode = errcode;
 
       /* We do not restore the signal mask because none was saved.  */
+#if defined __clang__ && defined __powerpc64__
+      (*longjmpptr) (lcatch->env[0].__jmpbuf, 1);
+#else
       __longjmp (lcatch->env[0].__jmpbuf, 1);
+#endif
     }
   else
     fatal_error (errcode, objname, occation, errstring);

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

Summary of changes:
 elf/dl-error-skeleton.c            |   23 +++++++++++++++++++++++
 sysdeps/pthread/aio_misc.c         |    3 +++
 sysdeps/unix/sysv/linux/aio_misc.h |    8 +++++++-
 3 files changed, 33 insertions(+), 1 deletions(-)


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