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commit acd98a8ed1460497e788c701eb92616f1df9b446
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Author: Andreas Krebbel <krebbel@linux.vnet.ibm.com>
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Date: Fri Nov 29 09:57:04 2013 +0100
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[BZ #16214] S/390: Fix TLS GOT pointer setup.
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diff --git glibc-2.17-c758a686/sysdeps/s390/Versions glibc-2.17-c758a686/sysdeps/s390/Versions
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index e18617c..baf9842 100644
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--- glibc-2.17-c758a686/sysdeps/s390/Versions
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+++ glibc-2.17-c758a686/sysdeps/s390/Versions
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@@ -3,4 +3,8 @@ ld {
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# runtime interface to TLS
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__tls_get_offset;
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}
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+ GLIBC_PRIVATE {
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+ # Exported by ld used by libc.
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+ __tls_get_addr_internal;
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+ }
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}
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diff --git glibc-2.17-c758a686/sysdeps/s390/dl-tls.h glibc-2.17-c758a686/sysdeps/s390/dl-tls.h
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index 68a5af4..52192a2 100644
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--- glibc-2.17-c758a686/sysdeps/s390/dl-tls.h
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+++ glibc-2.17-c758a686/sysdeps/s390/dl-tls.h
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@@ -26,11 +26,26 @@ typedef struct
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#ifdef SHARED
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-/* This is the prototype for the GNU version. */
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-extern void *__tls_get_addr (tls_index *ti) attribute_hidden;
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+
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extern unsigned long __tls_get_offset (unsigned long got_offset);
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# ifdef IS_IN_rtld
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+
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+# include <shlib-compat.h>
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+
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+extern void *__tls_get_addr (tls_index *ti) attribute_hidden;
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+/* Make a temporary alias of __tls_get_addr to remove the hidden
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+ attribute. Then export __tls_get_addr as __tls_get_addr_internal
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+ for use from libc. We do not want to export __tls_get_addr, but we
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+ do need to use it from libc when looking up the address of a TLS
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+ variable. We don't use __tls_get_offset because it requires r12 to
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+ be setup and that might not always be true. Either way it's more
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+ optimal to use __tls_get_addr directly (that's what
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+ __tls_get_offset does anyways). */
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+strong_alias (__tls_get_addr, __tls_get_addr_internal_tmp);
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+versioned_symbol (ld, __tls_get_addr_internal_tmp,
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+ __tls_get_addr_internal, GLIBC_PRIVATE);
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+
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/* The special thing about the s390 TLS ABI is that we do not have the
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standard __tls_get_addr function but the __tls_get_offset function
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which differs in two important aspects:
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@@ -63,15 +78,21 @@ __tls_get_offset:\n\
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1: .long __tls_get_addr - 0b\n\
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");
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# endif
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-# endif
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+# else /* IS_IN_rtld */
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+extern void *__tls_get_addr_internal (tls_index *ti);
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+# endif /* !IS_IN_rtld */
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# define GET_ADDR_OFFSET \
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(ti->ti_offset - (unsigned long) __builtin_thread_pointer ())
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-# define __TLS_GET_ADDR(__ti) \
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- ({ extern char _GLOBAL_OFFSET_TABLE_[] attribute_hidden; \
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- (void *) __tls_get_offset ((char *) (__ti) - _GLOBAL_OFFSET_TABLE_) \
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- + (unsigned long) __builtin_thread_pointer (); })
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+/* Use the privately exported __tls_get_addr_internal instead of
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+ __tls_get_offset in order to avoid the __tls_get_offset special
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+ linkage requiring the GOT pointer to be set up in r12. The
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+ compiler will take care of setting up r12 only if itself issued the
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+ __tls_get_offset call. */
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+# define __TLS_GET_ADDR(__ti) \
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+ ({ (void *) __tls_get_addr_internal ((char *) (__ti)) \
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+ + (unsigned long) __builtin_thread_pointer (); })
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#endif
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diff --git glibc-2.17-c758a686/sysdeps/s390/s390-32/tls-macros.h glibc-2.17-c758a686/sysdeps/s390/s390-32/tls-macros.h
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index 8a0ad58..a592d81 100644
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--- glibc-2.17-c758a686/sysdeps/s390/s390-32/tls-macros.h
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+++ glibc-2.17-c758a686/sysdeps/s390/s390-32/tls-macros.h
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@@ -8,12 +8,15 @@
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#ifdef PIC
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# define TLS_IE(x) \
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- ({ unsigned long __offset; \
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+ ({ unsigned long __offset, __got; \
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asm ("bras %0,1f\n" \
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- "0:\t.long " #x "@gotntpoff\n" \
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- "1:\tl %0,0(%0)\n\t" \
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- "l %0,0(%0,%%r12):tls_load:" #x \
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- : "=&a" (__offset) : : "cc" ); \
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+ "0:\t.long _GLOBAL_OFFSET_TABLE_-0b\n\t" \
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+ ".long " #x "@gotntpoff\n" \
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+ "1:\tl %1,0(%0)\n\t" \
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+ "la %1,0(%1,%0)\n\t" \
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+ "l %0,4(%0)\n\t" \
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+ "l %0,0(%0,%1):tls_load:" #x "\n" \
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+ : "=&a" (__offset), "=&a" (__got) : : "cc" ); \
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(int *) (__builtin_thread_pointer() + __offset); })
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#else
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# define TLS_IE(x) \
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diff --git glibc-2.17-c758a686/sysdeps/s390/s390-64/tls-macros.h glibc-2.17-c758a686/sysdeps/s390/s390-64/tls-macros.h
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index be8aa6c..3c59436 100644
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--- glibc-2.17-c758a686/sysdeps/s390/s390-64/tls-macros.h
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+++ glibc-2.17-c758a686/sysdeps/s390/s390-64/tls-macros.h
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@@ -8,12 +8,13 @@
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#ifdef PIC
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# define TLS_IE(x) \
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- ({ unsigned long __offset; \
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- asm ("bras %0,1f\n" \
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- "0:\t.quad " #x "@gotntpoff\n" \
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- "1:\tlg %0,0(%0)\n\t" \
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- "lg %0,0(%0,%%r12):tls_load:" #x \
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- : "=&a" (__offset) : : "cc" ); \
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+ ({ unsigned long __offset, __got; \
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+ asm ("bras %0,0f\n\t" \
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+ ".quad " #x "@gotntpoff\n" \
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+ "0:\tlarl %1,_GLOBAL_OFFSET_TABLE_\n\t" \
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+ "lg %0,0(%0)\n\t" \
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+ "lg %0,0(%0,%1):tls_load:" #x "\n" \
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+ : "=&a" (__offset), "=&a" (__got) : : "cc" ); \
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(int *) (__builtin_thread_pointer() + __offset); })
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#else
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# define TLS_IE(x) \
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