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commit 736c304a1ab4cee36a2f3343f1698bc0abae4608
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Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
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Date: Thu Jan 16 06:53:18 2014 -0600
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PowerPC: Fix ftime gettimeofday internal call returning bogus data
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This patches fixes BZ#16430 by setting a different symbol for internal
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GLIBC calls that points to ifunc resolvers. For PPC32, if the symbol
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is defined as hidden (which is the case for gettimeofday and time) the
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compiler will create local branches (symbol@local) and linker will not
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create PLT calls (required for IFUNC). This will leads to internal symbol
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calling the IFUNC resolver instead of the resolved symbol.
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For PPC64 this behavior does not occur because a call to a function in
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another translation unit might use a different toc pointer thus requiring
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a PLT call.
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diff --git glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
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index 29a5e08..2085b68 100644
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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
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@@ -44,8 +44,24 @@ asm (".type __gettimeofday, %gnu_indirect_function");
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/* This is doing "libc_hidden_def (__gettimeofday)" but the compiler won't
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let us do it in C because it doesn't know we're defining __gettimeofday
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here in this file. */
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-asm (".globl __GI___gettimeofday\n"
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- "__GI___gettimeofday = __gettimeofday");
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+asm (".globl __GI___gettimeofday");
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+
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+/* __GI___gettimeofday is defined as hidden and for ppc32 it enables the
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+ compiler make a local call (symbol@local) for internal GLIBC usage. It
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+ means the PLT won't be used and the ifunc resolver will be called directly.
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+ For ppc64 a call to a function in another translation unit might use a
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+ different toc pointer thus disallowing direct branchess and making internal
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+ ifuncs calls safe. */
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+#ifdef __powerpc64__
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+asm ("__GI___gettimeofday = __gettimeofday");
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+#else
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+int
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+__gettimeofday_vsyscall (struct timeval *tv, struct timezone *tz)
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+{
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+ return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
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+}
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+asm ("__GI___gettimeofday = __gettimeofday_vsyscall");
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+#endif
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#else
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diff --git glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/time.c glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/time.c
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index 089d0b6..023bc02 100644
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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/time.c
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/time.c
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@@ -54,8 +54,24 @@ asm (".type time, %gnu_indirect_function");
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/* This is doing "libc_hidden_def (time)" but the compiler won't
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* let us do it in C because it doesn't know we're defining time
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* here in this file. */
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-asm (".globl __GI_time\n"
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- "__GI_time = time");
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+asm (".globl __GI_time");
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+
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+/* __GI_time is defined as hidden and for ppc32 it enables the
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+ compiler make a local call (symbol@local) for internal GLIBC usage. It
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+ means the PLT won't be used and the ifunc resolver will be called directly.
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+ For ppc64 a call to a function in another translation unit might use a
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+ different toc pointer thus disallowing direct branchess and making internal
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+ ifuncs calls safe. */
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+#ifdef __powerpc64__
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+asm ("__GI_time = time");
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+#else
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+time_t
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+__time_vsyscall (time_t *t)
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+{
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+ return INLINE_VSYSCALL (time, 1, t);
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+}
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+asm ("__GI_time = __time_vsyscall");
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+#endif
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#else
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