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#
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# commit d98720e07f67fbeec00f9e1347840404240d3c48
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# Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
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# Date: Mon Jan 20 12:29:51 2014 -0600
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#
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# PowerPC: Fix gettimeofday ifunc selection
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#
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# The IFUNC selector for gettimeofday runs before _libc_vdso_platform_setup where
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# __vdso_gettimeofday is set. The selector then sets __gettimeofday (the internal
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# version used within GLIBC) to use the system call version instead of the vDSO one.
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# This patch changes the check if vDSO is available to get its value directly
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# instead of rely on __vdso_gettimeofday.
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#
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# This patch changes it by getting the vDSO value directly.
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#
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# It fixes BZ#16431.
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#
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diff -urN 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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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c 2015-01-15 16:07:59.167420456 -0500
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c 2015-01-15 16:07:41.408969001 -0500
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@@ -34,9 +34,12 @@
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void *
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gettimeofday_ifunc (void)
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{
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+ PREPARE_VERSION (linux2615, "LINUX_2.6.15", 123718565);
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+
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/* If the vDSO is not available we fall back syscall. */
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- return (__vdso_gettimeofday ? VDSO_IFUNC_RET (__vdso_gettimeofday)
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- : __gettimeofday_syscall);
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+ void *vdso_gettimeofday = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2615);
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+ return (vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday)
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+ : (void*)__gettimeofday_syscall);
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}
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asm (".type __gettimeofday, %gnu_indirect_function");
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diff -urN 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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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/time.c 2015-01-15 16:07:59.168420425 -0500
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/time.c 2015-01-15 16:07:41.408969001 -0500
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@@ -45,9 +45,12 @@
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void *
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time_ifunc (void)
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{
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+ PREPARE_VERSION (linux2615, "LINUX_2.6.15", 123718565);
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+
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/* If the vDSO is not available we fall back to the syscall. */
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- return (__vdso_time ? VDSO_IFUNC_RET (__vdso_time)
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- : time_syscall);
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+ void *vdso_time = _dl_vdso_vsym ("__kernel_time", &linux2615);
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+ return (vdso_time ? VDSO_IFUNC_RET (vdso_time)
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+ : (void*)time_syscall);
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}
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asm (".type time, %gnu_indirect_function");
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