Update.

2002-12-19  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/i386/sysdep.h: Add support to use AT_SYSINFO
	information for system calls.

	* sysdeps/generic/dl-sysdep.h: Define RTLD_PRIVATE_ERRNO to 1 only
	for ld.so.

	* elf/rtld.c (_dl_start) [USE___THREAD]: Define initdtv.

ChangeLog

@@ -1,3 +1,13 @@
+2002-12-19  Ulrich Drepper  <drepper@redhat.com>
+
+	* sysdeps/unix/sysv/linux/i386/sysdep.h: Add support to use AT_SYSINFO
+	information for system calls.
+
+	* sysdeps/generic/dl-sysdep.h: Define RTLD_PRIVATE_ERRNO to 1 only
+	for ld.so.
+
+	* elf/rtld.c (_dl_start) [USE___THREAD]: Define initdtv.
+
 2002-12-19  Roland McGrath  <roland@redhat.com>
 
 	* iconvdata/ibm856.h: Convert GCC extension initializer syntax to C99.

elf/rtld.c

@@ -37,6 +37,7 @@
 #include <unsecvars.h>
 #include <dl-cache.h>
 #include <dl-procinfo.h>
+#include <tls.h>
 
 #include <assert.h>
 
@@ -328,6 +329,7 @@ _dl_start (void *arg)
      to it.  When we have something like GOTOFF relocs, we can use a plain
      reference to find the runtime address.  Without that, we have to rely
      on the `l_addr' value, which is not the value we want when prelinked.  */
+  dtv_t initdtv[3];
   ElfW(Ehdr) *ehdr
 # ifdef DONT_USE_BOOTSTRAP_MAP
     = (ElfW(Ehdr) *) &_begin;

nptl/ChangeLog

@@ -1,5 +1,12 @@
 2002-12-19  Ulrich Drepper  <drepper@redhat.com>
 
+	* allocatestack.c (allocate_stack) [NEED_DL_SYSINFO]: Set sysinfo
+	in new TCB.
+	* sysdeps/unix/sysv/linux/i386/createthread.c (create_thread): Check
+	that sysinfo is properly initialized.
+	* sysdeps/unix/sysv/linux/i386/dl-sysdep.h: Define RTLD_PRIVATE_ERRNO
+	to 1 only for ld.so.
+
 	* sysdeps/unix/sysv/linux/i386/dl-sysdep.h: Define
 	RTLD_CORRECT_DYNAMIC_WEAK.
 

nptl/sysdeps/unix/sysv/linux/i386/createthread.c

@@ -108,6 +108,11 @@ create_thread (struct pthread *pd, STACK_VARIABLES_PARMS)
 	}
     }
 
+#ifdef NEED_DL_SYSINFO
+  assert (THREAD_GETMEM (THREAD_SELF, header.data.sysinfo)
+	  == pd->header.data.sysinfo);
+#endif
+
   /* We rely heavily on various flags the CLONE function understands:
 
      CLONE_VM, CLONE_FS, CLONE_FILES

nptl/sysdeps/unix/sysv/linux/i386/dl-sysdep.h

@@ -28,7 +28,11 @@
    all the libc functions that ld.so uses are called without PLT and always
    get the versions linked into ld.so rather than the libc ones.  */
 
-#define RTLD_PRIVATE_ERRNO 1
+#ifdef IS_IN_rtld
+# define RTLD_PRIVATE_ERRNO 1
+#else
+# define RTLD_PRIVATE_ERRNO 0
+#endif
 
 /* This configuration has in libc.so cancellable functions and other
    functions which have to behave differently if the application uses

sysdeps/generic/dl-sysdep.h

@@ -25,4 +25,8 @@
    all the libc functions that ld.so uses are called without PLT and always
    get the versions linked into ld.so rather than the libc ones.  */
 
-#define RTLD_PRIVATE_ERRNO 1
+#ifdef IS_IN_rtld
+# define RTLD_PRIVATE_ERRNO 1
+#else
+# define RTLD_PRIVATE_ERRNO 0
+#endif

sysdeps/unix/sysv/linux/i386/sysdep.h

@@ -24,14 +24,11 @@
 #include <sysdeps/unix/i386/sysdep.h>
 #include <bp-sym.h>
 #include <bp-asm.h>
+/* Defines RTLD_PRIVATE_ERRNO and NEED_DL_SYSINFO.  */
+#include <dl-sysdep.h>
 #include <tls.h>
 
 
-#ifdef IS_IN_rtld
-# include <dl-sysdep.h>		/* Defines RTLD_PRIVATE_ERRNO.  */
-#endif
-
-
 /* For Linux we can use the system call table in the header file
 	/usr/include/asm/unistd.h
    of the kernel.  But these symbols do not follow the SYS_* syntax
@@ -39,6 +36,12 @@
 #undef SYS_ify
 #define SYS_ify(syscall_name)	__NR_##syscall_name
 
+#if defined NEED_DL_SYSINFO && !defined IS_IN_rtld
+# define I386_USE_SYSENTER	1
+#else
+# undef I386_USE_SYSENTER
+#endif
+
 #ifdef __ASSEMBLER__
 
 /* Linux uses a negative return value to indicate syscall errors,
@@ -162,7 +165,15 @@ __i686.get_pc_thunk.reg:						      \
 
 /* The original calling convention for system calls on Linux/i386 is
    to use int $0x80.  */
-#define ENTER_KERNEL int $0x80
+#ifdef I386_USE_SYSENTER
+# ifdef SHARED
+#  define ENTER_KERNEL call *%gs:SYSINFO_OFFSET
+# else
+#  define ENTER_KERNEL call *_dl_sysinfo
+# endif
+#else
+# define ENTER_KERNEL int $0x80
+#endif
 
 /* Linux takes system call arguments in registers:
 
@@ -260,10 +271,6 @@ __i686.get_pc_thunk.reg:						      \
 
 #else	/* !__ASSEMBLER__ */
 
-/* The original calling convention for system calls on Linux/i386 is
-   to use int $0x80.  */
-#define ENTER_KERNEL "int $0x80"
-
 /* We need some help from the assembler to generate optimal code.  We
    define some macros here which later will be used.  */
 asm (".L__X'%ebx = 1\n\t"
@@ -318,17 +325,46 @@ asm (".L__X'%ebx = 1\n\t"
    normally.  It will never touch errno.  This returns just what the kernel
    gave back.  */
 #undef INTERNAL_SYSCALL
-#define INTERNAL_SYSCALL(name, nr, args...) \
+#ifdef I386_USE_SYSENTER
+# ifdef SHARED
+#  define INTERNAL_SYSCALL(name, nr, args...) \
   ({									      \
     unsigned int resultvar;						      \
     asm volatile (							      \
     LOADARGS_##nr							      \
     "movl %1, %%eax\n\t"						      \
-    ENTER_KERNEL "\n\t"						      \
+    "call *%%gs:%P2\n\t"						      \
+    RESTOREARGS_##nr							      \
+    : "=a" (resultvar)							      \
+    : "i" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo))		      \
+      ASMFMT_##nr(args) : "memory", "cc");				      \
+    (int) resultvar; })
+# else
+#  define INTERNAL_SYSCALL(name, nr, args...) \
+  ({									      \
+    unsigned int resultvar;						      \
+    asm volatile (							      \
+    LOADARGS_##nr							      \
+    "movl %1, %%eax\n\t"						      \
+    "call *_dl_sysinfo\n\t"						      \
     RESTOREARGS_##nr							      \
     : "=a" (resultvar)							      \
     : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc");		      \
     (int) resultvar; })
+# endif
+#else
+# define INTERNAL_SYSCALL(name, nr, args...) \
+  ({									      \
+    unsigned int resultvar;						      \
+    asm volatile (							      \
+    LOADARGS_##nr							      \
+    "movl %1, %%eax\n\t"						      \
+    "int $0x80\n\t"						      \
+    RESTOREARGS_##nr							      \
+    : "=a" (resultvar)							      \
+    : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc");		      \
+    (int) resultvar; })
+#endif
 
 #undef INTERNAL_SYSCALL_ERROR_P
 #define INTERNAL_SYSCALL_ERROR_P(val)	((unsigned int) (val) >= 0xfffff001u)
@@ -337,17 +373,28 @@ asm (".L__X'%ebx = 1\n\t"
 #define INTERNAL_SYSCALL_ERRNO(val)	(-(val))
 
 #define LOADARGS_0
-#define LOADARGS_1 \
+#if defined I386_USE_SYSENTER && defined SHARED
+# define LOADARGS_1 \
+    "bpushl .L__X'%k3, %k3\n\t"						      \
+    "bmovl .L__X'%k3, %k3\n\t"
+#else
+# define LOADARGS_1 \
     "bpushl .L__X'%k2, %k2\n\t"						      \
     "bmovl .L__X'%k2, %k2\n\t"
+#endif
 #define LOADARGS_2	LOADARGS_1
 #define LOADARGS_3	LOADARGS_1
 #define LOADARGS_4	LOADARGS_1
 #define LOADARGS_5	LOADARGS_1
 
 #define RESTOREARGS_0
-#define RESTOREARGS_1 \
+#if defined I386_USE_SYSENTER && defined SHARED
+# define RESTOREARGS_1 \
+    "bpopl .L__X'%k3, %k3\n\t"
+#else
+# define RESTOREARGS_1 \
     "bpopl .L__X'%k2, %k2\n\t"
+#endif
 #define RESTOREARGS_2	RESTOREARGS_1
 #define RESTOREARGS_3	RESTOREARGS_1
 #define RESTOREARGS_4	RESTOREARGS_1