GNU C Library master sources branch hjl/plt created. glibc-2.20-404-gb44d722

[hjl at sourceware dot org]

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        at  b44d722155c42abca4c23fc0a780f0737cb07a18 (commit)

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=b44d722155c42abca4c23fc0a780f0737cb07a18

commit b44d722155c42abca4c23fc0a780f0737cb07a18
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sat Dec 20 12:23:54 2014 -0800

    Add hidden __tls_get_addr/___tls_get_addr alias
    
    __tls_get_addr/___tls_get_addr is always defined in ld.so.  There is
    no need to call them via PLT inside ld.so.  This patch adds the hidden
    __tls_get_addr/___tls_get_addr aliases and calls them directly from
    _dl_tlsdesc_dynamic.  There is no need to set up the EBX register in
    i386 _dl_tlsdesc_dynamic when calling the hidden ___tls_get_addr.
    
    	* elf/dl-tls.c (__tls_get_addr): Provide the hidden definition
    	if not defined.
    	* sysdeps/i386/dl-tls.h (___tls_get_addr): Provide the hidden
    	definition.
    	* sysdeps/i386/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Call the
    	hidden ___tls_get_addr.
    	* sysdeps/x86_64/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Call the
    	hidden __tls_get_addr.
    	* sysdeps/generic/localplt.data (__tls_get_addr): Removed.
    	* sysdeps/unix/sysv/linux/i386/localplt.data (___tls_get_addr):
    	Likewise.

diff --git a/ChangeLog b/ChangeLog
index de45fe4..2e1f3fb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,19 @@
 2014-12-21  H.J. Lu  <hongjiu.lu@intel.com>
 
+	* elf/dl-tls.c (__tls_get_addr): Provide the hidden definition
+	if not defined.
+	* sysdeps/i386/dl-tls.h (___tls_get_addr): Provide the hidden
+	definition.
+	* sysdeps/i386/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Call the
+	hidden ___tls_get_addr.
+	* sysdeps/x86_64/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Call the
+	hidden __tls_get_addr.
+	* sysdeps/generic/localplt.data (__tls_get_addr): Removed.
+	* sysdeps/unix/sysv/linux/i386/localplt.data (___tls_get_addr):
+	Likewise.
+
+2014-12-21  H.J. Lu  <hongjiu.lu@intel.com>
+
 	* sysdeps/i386/dl-machine.h (_dl_start_user): Remove @PLT
 	from "call _dl_init@PLT".
 	* sysdeps/x86_64/dl-machine.h (_dl_start_user): Likewise.
diff --git a/elf/dl-tls.c b/elf/dl-tls.c
index 76b8b36..cff213f 100644
--- a/elf/dl-tls.c
+++ b/elf/dl-tls.c
@@ -809,6 +809,11 @@ update_get_addr (GET_ADDR_ARGS)
   return (void *) p + GET_ADDR_OFFSET;
 }
 
+#ifndef __tls_get_addr
+extern void * __tls_get_addr (GET_ADDR_ARGS);
+rtld_hidden_proto (__tls_get_addr)
+rtld_hidden_def (__tls_get_addr)
+#endif
 
 /* The generic dynamic and local dynamic model cannot be used in
    statically linked applications.  */
diff --git a/sysdeps/generic/localplt.data b/sysdeps/generic/localplt.data
index d7d6734..1a40cf9 100644
--- a/sysdeps/generic/localplt.data
+++ b/sysdeps/generic/localplt.data
@@ -7,10 +7,9 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
-# internally to allocate aligned TLS storage. The other malloc family of
-# functions are expected to allow user symbol interposition.
-ld.so: __tls_get_addr
+# The dynamic loader uses __libc_memalign internally to allocate aligned
+# TLS storage. The other malloc family of functions are expected to allow
+# user symbol interposition.
 ld.so: __libc_memalign
 ld.so: malloc
 ld.so: calloc
diff --git a/sysdeps/i386/dl-tls.h b/sysdeps/i386/dl-tls.h
index 48809a5..99b86f9 100644
--- a/sysdeps/i386/dl-tls.h
+++ b/sysdeps/i386/dl-tls.h
@@ -50,6 +50,8 @@ __tls_get_addr (tls_index *ti)
    version of this file.  */
 # define __tls_get_addr __attribute__ ((__regparm__ (1))) ___tls_get_addr
 strong_alias (___tls_get_addr, ___tls_get_addr_internal)
+rtld_hidden_proto (___tls_get_addr)
+rtld_hidden_def (___tls_get_addr)
 #else
 
 /* Users should get the better interface.  */
diff --git a/sysdeps/i386/dl-tlsdesc.S b/sysdeps/i386/dl-tlsdesc.S
index e6753e9..570b180 100644
--- a/sysdeps/i386/dl-tlsdesc.S
+++ b/sysdeps/i386/dl-tlsdesc.S
@@ -126,10 +126,7 @@ _dl_tlsdesc_dynamic:
 	.p2align 4,,7
 .Lslow:
 	cfi_adjust_cfa_offset (28)
-	movl	%ebx, 16(%esp)
-	LOAD_PIC_REG (bx)
-	call	___tls_get_addr@PLT
-	movl	16(%esp), %ebx
+	call	HIDDEN_JUMPTARGET (___tls_get_addr)
 	jmp	.Lret
 	cfi_endproc
 	.size	_dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
diff --git a/sysdeps/unix/sysv/linux/i386/localplt.data b/sysdeps/unix/sysv/linux/i386/localplt.data
index 009797b..b25abf8 100644
--- a/sysdeps/unix/sysv/linux/i386/localplt.data
+++ b/sysdeps/unix/sysv/linux/i386/localplt.data
@@ -5,12 +5,9 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
-# The dynamic loader needs ___tls_get_addr for TLS, and uses __libc_memalign
-# internally to allocate aligned TLS storage. The other malloc family of
-# functions are expected to allow user symbol interposition.
-# Note that it is triple underscore for ___tls_get_addr e.g. the alternate
-# ABI.
-ld.so: ___tls_get_addr
+# The dynamic loader uses __libc_memalign internally to allocate aligned
+# TLS storage. The other malloc family of functions are expected to allow
+# user symbol interposition.
 ld.so: __libc_memalign
 ld.so: malloc
 ld.so: calloc
diff --git a/sysdeps/x86_64/dl-tlsdesc.S b/sysdeps/x86_64/dl-tlsdesc.S
index 92e18a5..03f5ca4 100644
--- a/sysdeps/x86_64/dl-tlsdesc.S
+++ b/sysdeps/x86_64/dl-tlsdesc.S
@@ -128,7 +128,7 @@ _dl_tlsdesc_dynamic:
 	movq	%r10, 40(%rsp)
 	movq	%r11, 48(%rsp)
 	/* %rdi already points to the tlsinfo data structure.  */
-	call	__tls_get_addr@PLT
+	call	HIDDEN_JUMPTARGET (__tls_get_addr)
 	movq	8(%rsp), %rdx
 	movq	16(%rsp), %rcx
 	movq	24(%rsp), %r8

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=1d19f60e4fcf5541fed1215fda47997b8e0389cb

commit 1d19f60e4fcf5541fed1215fda47997b8e0389cb
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Dec 19 06:30:31 2014 -0800

    Compile vismain with -fPIC and link with -pie

diff --git a/elf/Makefile b/elf/Makefile
index 9e07073..4563421 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -130,7 +130,7 @@ endif
 tests += $(tests-static)
 ifeq (yes,$(build-shared))
 tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
-	 constload1 order vismain noload filter unload \
+	 constload1 order noload filter unload \
 	 reldep reldep2 reldep3 reldep4 nodelete nodelete2 \
 	 nodlopen nodlopen2 neededtest neededtest2 \
 	 neededtest3 neededtest4 unload2 lateglobal initfirst global \
@@ -218,6 +218,9 @@ ifeq (yesyes,$(have-fpie)$(build-shared))
 modules-names += tst-piemod1
 tests += tst-pie1 tst-pie2
 tests-pie += tst-pie1 tst-pie2
+tests += vismain
+tests-pie += vismain
+CFLAGS-vismain.c = $(pic-ccflag)
 endif
 modules-execstack-yes = tst-execstack-mod
 extra-test-objs += $(addsuffix .os,$(strip $(modules-names)))

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