graphene/LibOS/glibc-patches/glibc-2.23.patch

diff -ruNp a/elf/dl-load.c b/elf/dl-load.c
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -45,6 +45,7 @@
 #include <dl-machine-reject-phdr.h>
 #include <dl-sysdep-open.h>
 
+#include <glibc-version.h>
 
 #include <endian.h>
 #if BYTE_ORDER == BIG_ENDIAN
@@ -1415,6 +1416,9 @@ cannot enable executable stack as shared
   DL_AFTER_LOAD (l);
 #endif
 
+  /* register the library to SHIM */
+  register_library(l->l_name, l->l_addr);
+
   /* Now that the object is fully initialized add it to the object list.  */
   _dl_add_to_namespace_list (l, nsid);
 
diff -ruNp a/elf/Makefile b/elf/Makefile
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -21,7 +21,7 @@ subdir		:= elf
 
 include ../Makeconfig
 
-headers		= elf.h bits/elfclass.h link.h bits/link.h
+headers		= elf.h bits/elfclass.h link.h bits/link.h syscalldb.h
 routines	= $(all-dl-routines) dl-support dl-iteratephdr \
 		  dl-addr enbl-secure dl-profstub \
 		  dl-origin dl-libc dl-sym dl-tsd dl-sysdep
@@ -31,7 +31,8 @@ routines	= $(all-dl-routines) dl-support
 dl-routines	= $(addprefix dl-,load lookup object reloc deps hwcaps \
 				  runtime error init fini debug misc \
 				  version profile conflict tls origin scope \
-				  execstack caller open close trampoline)
+				  execstack caller open close trampoline) \
+		  syscalldb syscallas
 ifeq (yes,$(use-ldconfig))
 dl-routines += dl-cache
 endif
diff -ruNp a/elf/rtld.c b/elf/rtld.c
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -332,6 +332,23 @@ _dl_start_final (void *arg, struct dl_st
   return start_addr;
 }
 
+/* For graphene, check if glibc version match to the compatible SHIM
+   library. If not, tell the user to update glibc. */
+#include "glibc-version.h"
+
+const unsigned int glibc_version __attribute__((weak)) = GLIBC_VERSION;
+
+static void __attribute__((noinline,optimize("-O0")))
+check_glibc_version (void)
+{
+  if (glibc_version != GLIBC_VERSION)
+    {
+      _dl_fatal_printf ("Warning from Graphene: "
+                        "Glibc version is incorrect. Please rebuild Glibc.\n");
+      _exit (1);
+    }
+}
+
 static ElfW(Addr) __attribute_used__ internal_function
 _dl_start (void *arg)
 {
@@ -402,6 +419,9 @@ _dl_start (void *arg)
      therefore need not test whether we have to allocate the array
      for the relocation results (as done in dl-reloc.c).  */
 
+  /* For Graphene, check if the glibc version is correct. */
+  check_glibc_version();
+
   /* Now life is sane; we can call functions and access global data.
      Set up to use the operating system facilities, and find out from
      the operating system's program loader where to find the program
diff -ruNp a/elf/Versions b/elf/Versions
--- a/elf/Versions
+++ b/elf/Versions
@@ -65,4 +68,7 @@ ld {
     # Pointer protection.
     __pointer_chk_guard;
   }
+  SHIM {
+    syscalldb; glibc_version; glibc_option; register_library;
+  }
 }
diff -ruNp a/Makeconfig b/Makeconfig
--- a/Makeconfig
+++ b/Makeconfig
@@ -841,7 +841,8 @@ endif	# $(+cflags) == ""
 # current directory.
 +includes = -I$(..)include $(if $(subdir),$(objpfx:%/=-I%)) \
 	    $(+sysdep-includes) $(includes) \
-	    $(patsubst %/,-I%,$(..)) $(libio-include) -I. $(sysincludes)
+	    $(patsubst %/,-I%,$(..)) $(libio-include) -I. $(sysincludes) \
+	    -I$(common-objpfx)../shim/include
 
 # Since libio has several internal header files, we use a -I instead
 # of many little headers in the include directory.
diff -ruNp a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -178,6 +178,8 @@ $(inst_includedir)/gnu/stubs.h: $(+force
 install-others-nosubdir: $(installed-stubs)
 endif
 
+# For Graphene
+CFLAGS-syscalldb.c = -fPIC
 
 # Since stubs.h is never needed when building the library, we simplify the
 # hairy installation process by producing it in place only as the last part
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/cancellation.S b/sysdeps/unix/sysv/linux/x86_64/cancellation.S
--- a/sysdeps/unix/sysv/linux/x86_64/cancellation.S
+++ b/sysdeps/unix/sysv/linux/x86_64/cancellation.S
@@ -111,7 +111,7 @@ ENTRY(__pthread_disable_asynccancel)
 	xorq	%r10, %r10
 	addq	$CANCELHANDLING, %rdi
 	LOAD_PRIVATE_FUTEX_WAIT (%esi)
-	syscall
+	SYSCALLDB
 	movl	%fs:CANCELHANDLING, %eax
 	jmp	3b
 END(__pthread_disable_asynccancel)
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/clone.S b/sysdeps/unix/sysv/linux/x86_64/clone.S
--- a/sysdeps/unix/sysv/linux/x86_64/clone.S
+++ b/sysdeps/unix/sysv/linux/x86_64/clone.S
@@ -76,7 +76,7 @@ ENTRY (__clone)
 	/* End FDE now, because in the child the unwind info will be
 	   wrong.  */
 	cfi_endproc;
-	syscall
+	SYSCALLDB
 
 	testq	%rax,%rax
 	jl	SYSCALL_ERROR_LABEL
@@ -98,7 +98,7 @@ L(thread_start):
 	movl	$-1, %eax
 	jne	2f
 	movl	$SYS_ify(getpid), %eax
-	syscall
+	SYSCALLDB
 2:	movl	%eax, %fs:PID
 	movl	%eax, %fs:TID
 1:
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/getcontext.S b/sysdeps/unix/sysv/linux/x86_64/getcontext.S
--- a/sysdeps/unix/sysv/linux/x86_64/getcontext.S
+++ b/sysdeps/unix/sysv/linux/x86_64/getcontext.S
@@ -75,7 +75,7 @@ ENTRY(__getcontext)
 #endif
 	movl	$_NSIG8,%r10d
 	movl	$__NR_rt_sigprocmask, %eax
-	syscall
+	SYSCALLDB
 	cmpq	$-4095, %rax		/* Check %rax for error.  */
 	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
 
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S
--- a/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S
+++ b/sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S
@@ -84,7 +84,8 @@ ENTRY(____longjmp_chk)
 	xorl	%edi, %edi
 	lea	-sizeSS(%rsp), %RSI_LP
 	movl	$__NR_sigaltstack, %eax
-	syscall
+	SYSCALLDB
+
 	/* Without working sigaltstack we cannot perform the test.  */
 	testl	%eax, %eax
 	jne	.Lok2
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S b/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
--- a/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
+++ b/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
@@ -90,7 +90,7 @@ __lll_lock_wait_private:
 
 1:	LIBC_PROBE (lll_lock_wait_private, 1, %rdi)
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 2:	movl	%edx, %eax
 	xchgl	%eax, (%rdi)	/* NB:	 lock is implied */
@@ -130,7 +130,7 @@ __lll_lock_wait:
 
 1:	LIBC_PROBE (lll_lock_wait, 2, %rdi, %rsi)
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 2:	movl	%edx, %eax
 	xchgl	%eax, (%rdi)	/* NB:	 lock is implied */
@@ -185,7 +185,7 @@ __lll_timedlock_wait:
 
 1:	movl	$SYS_futex, %eax
 	movl	$2, %edx
-	syscall
+	SYSCALLDB
 
 2:	xchgl	%edx, (%rdi)	/* NB:   lock is implied */
 
@@ -279,7 +279,7 @@ __lll_timedlock_wait:
 	LOAD_FUTEX_WAIT (%esi)
 	movq	%r12, %rdi
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	/* NB: %edx == 2 */
 	xchgl	%edx, (%r12)
@@ -336,7 +336,7 @@ __lll_unlock_wake_private:
 	LOAD_PRIVATE_FUTEX_WAKE (%esi)
 	movl	$1, %edx	/* Wake one thread.  */
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	popq	%rdx
 	cfi_adjust_cfa_offset(-8)
@@ -366,7 +366,7 @@ __lll_unlock_wake:
 	LOAD_FUTEX_WAKE (%esi)
 	movl	$1, %edx	/* Wake one thread.  */
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	popq	%rdx
 	cfi_adjust_cfa_offset(-8)
@@ -436,7 +436,7 @@ __lll_timedwait_tid:
 #endif
 	movq	%r12, %rdi
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	cmpl	$0, (%rdi)
 	jne	1f
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/lowlevelrobustlock.S b/sysdeps/unix/sysv/linux/x86_64/lowlevelrobustlock.S
--- a/sysdeps/unix/sysv/linux/x86_64/lowlevelrobustlock.S
+++ b/sysdeps/unix/sysv/linux/x86_64/lowlevelrobustlock.S
@@ -80,7 +80,7 @@ __lll_robust_lock_wait:
 	jnz	2f
 
 1:	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	movl	(%rdi), %eax
 
@@ -145,7 +145,7 @@ __lll_robust_timedlock_wait:
 	jnz	6f
 
 5:	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 	movl	%eax, %ecx
 
 	movl	(%rdi), %eax
@@ -257,7 +257,7 @@ __lll_robust_timedlock_wait:
 	LOAD_FUTEX_WAIT (%esi)
 	movq	%r12, %rdi
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 	movq	%rax, %rcx
 
 	movl	(%r12), %eax
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/pthread_cond_broadcast.S b/sysdeps/unix/sysv/linux/x86_64/pthread_cond_broadcast.S
--- a/sysdeps/unix/sysv/linux/x86_64/pthread_cond_broadcast.S
+++ b/sysdeps/unix/sysv/linux/x86_64/pthread_cond_broadcast.S
@@ -87,7 +87,7 @@ ENTRY(__pthread_cond_broadcast)
 	movl	$SYS_futex, %eax
 	movl	$1, %edx
 	movl	$0x7fffffff, %r10d
-	syscall
+	SYSCALLDB
 
 	/* For any kind of error, which mainly is EAGAIN, we try again
 	   with WAKE.  The general test also covers running on old
@@ -103,7 +103,7 @@ ENTRY(__pthread_cond_broadcast)
 	movl	$SYS_futex, %eax
 	movl	$1, %edx
 	movl	$0x7fffffff, %r10d
-	syscall
+	SYSCALLDB
 
 	/* For any kind of error, which mainly is EAGAIN, we try again
 	   with WAKE.  The general test also covers running on old
@@ -169,7 +169,7 @@ ENTRY(__pthread_cond_broadcast)
 	orl	$FUTEX_WAKE, %esi
 #endif
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 	jmp	10b
 END(__pthread_cond_broadcast)
 
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S b/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S
--- a/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S
+++ b/sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S
@@ -78,7 +78,7 @@ ENTRY(__pthread_cond_signal)
 	addq	$cond_lock, %r8
 #endif
 	movl	$FUTEX_OP_CLEAR_WAKE_IF_GT_ONE, %r9d
-	syscall
+	SYSCALLDB
 #if cond_lock != 0
 	subq	$cond_lock, %r8
 #endif
@@ -95,7 +95,7 @@ ENTRY(__pthread_cond_signal)
 	movq	%rcx, %r8
 	xorq	%r10, %r10
 	movl	(%rdi), %r9d	// XXX Can this be right?
-	syscall
+	SYSCALLDB
 
 	leaq	-cond_futex(%rdi), %r8
 
@@ -114,7 +114,7 @@ ENTRY(__pthread_cond_signal)
 	movl	$SYS_futex, %eax
 	/* %rdx should be 1 already from $FUTEX_WAKE_OP syscall.
 	movl	$1, %edx  */
-	syscall
+	SYSCALLDB
 
 	/* Unlock.  */
 4:	LOCK
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S b/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
--- a/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
+++ b/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
@@ -175,7 +175,7 @@ __pthread_cond_timedwait:
 	movq	%r12, %rdx
 	addq	$cond_futex, %rdi
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	cmpl	$0, %eax
 	sete	%r15b
@@ -221,7 +221,7 @@ __pthread_cond_timedwait:
 	movq	%r12, %rdx
 	addq	$cond_futex, %rdi
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 62:	movq	%rax, %r14
 
 	movl	(%rsp), %edi
@@ -308,7 +308,7 @@ __pthread_cond_timedwait:
 	orl	$FUTEX_WAKE, %esi
 #endif
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 	subq	$cond_nwaiters, %rdi
 
 55:	LOCK
@@ -521,7 +521,7 @@ __condvar_cleanup2:
 	orl	$FUTEX_WAKE, %esi
 #endif
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 	subq	$cond_nwaiters, %rdi
 	movl	$1, %r12d
 
@@ -558,7 +558,7 @@ __condvar_cleanup2:
 	orl	$FUTEX_WAKE, %esi
 #endif
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	/* Lock the mutex only if we don't own it already.  This only happens
 	   in case of PI mutexes, if we got cancelled after a successful
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S b/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
--- a/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
+++ b/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
@@ -138,7 +138,7 @@ __pthread_cond_wait:
 
 	movl	$(FUTEX_WAIT_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %esi
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	cmpl	$0, %eax
 	sete	%r8b
@@ -180,7 +180,7 @@ __pthread_cond_wait:
 #endif
 60:	xorb	%r8b, %r8b
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 62:	movl	(%rsp), %edi
 	callq	__pthread_disable_asynccancel
@@ -239,7 +239,7 @@ __pthread_cond_wait:
 	orl	$FUTEX_WAKE, %esi
 #endif
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 	subq	$cond_nwaiters, %rdi
 
 17:	LOCK
@@ -455,7 +455,7 @@ __condvar_cleanup1:
 	orl	$FUTEX_WAKE, %esi
 #endif
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 	subq	$cond_nwaiters, %rdi
 	movl	$1, %ecx
 
@@ -493,7 +493,7 @@ __condvar_cleanup1:
 	orl	$FUTEX_WAKE, %esi
 #endif
 	movl	$SYS_futex, %eax
-	syscall
+	SYSCALLDB
 
 	/* Lock the mutex only if we don't own it already.  This only happens
 	   in case of PI mutexes, if we got cancelled after a successful
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/setcontext.S b/sysdeps/unix/sysv/linux/x86_64/setcontext.S
--- a/sysdeps/unix/sysv/linux/x86_64/setcontext.S
+++ b/sysdeps/unix/sysv/linux/x86_64/setcontext.S
@@ -43,7 +43,7 @@ ENTRY(__setcontext)
 	movl	$SIG_SETMASK, %edi
 	movl	$_NSIG8,%r10d
 	movl	$__NR_rt_sigprocmask, %eax
-	syscall
+	SYSCALLDB
 	popq	%rdi			/* Reload %rdi, adjust stack.  */
 	cfi_adjust_cfa_offset(-8)
 	cmpq	$-4095, %rax		/* Check %rax for error.  */
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/sigaction.c b/sysdeps/unix/sysv/linux/x86_64/sigaction.c
--- a/sysdeps/unix/sysv/linux/x86_64/sigaction.c
+++ b/sysdeps/unix/sysv/linux/x86_64/sigaction.c
@@ -120,7 +120,7 @@ asm									\
    "	.type __" #name ",@function\n"					\
    "__" #name ":\n"							\
    "	movq $" #syscall ", %rax\n"					\
-   "	syscall\n"							\
+   SYSCALLDB_ASM							\
    ".LEND_" #name ":\n"							\
    ".section .eh_frame,\"a\",@progbits\n"				\
    ".LSTARTFRAME_" #name ":\n"						\
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/swapcontext.S b/sysdeps/unix/sysv/linux/x86_64/swapcontext.S
--- a/sysdeps/unix/sysv/linux/x86_64/swapcontext.S
+++ b/sysdeps/unix/sysv/linux/x86_64/swapcontext.S
@@ -75,7 +75,7 @@ ENTRY(__swapcontext)
 	movl	$SIG_SETMASK, %edi
 	movl	$_NSIG8,%r10d
 	movl	$__NR_rt_sigprocmask, %eax
-	syscall
+	SYSCALLDB
 	cmpq	$-4095, %rax		/* Check %rax for error.  */
 	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
 
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/syscall.S b/sysdeps/unix/sysv/linux/x86_64/syscall.S
--- a/sysdeps/unix/sysv/linux/x86_64/syscall.S
+++ b/sysdeps/unix/sysv/linux/x86_64/syscall.S
@@ -34,7 +34,7 @@ ENTRY (syscall)
 	movq %r8, %r10
 	movq %r9, %r8
 	movq 8(%rsp),%r9	/* arg6 is on the stack.  */
-	syscall			/* Do the system call.  */
+	SYSCALLDB			/* Do the system call.  */
 	cmpq $-4095, %rax	/* Check %rax for error.  */
 	jae SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
 	ret			/* Return to caller.  */
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
--- a/sysdeps/unix/sysv/linux/x86_64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
@@ -22,6 +22,7 @@
 #include <sysdeps/unix/sysv/linux/sysdep.h>
 #include <sysdeps/unix/x86_64/sysdep.h>
 #include <tls.h>
+#include "syscalldb.h"
 
 #if IS_IN (rtld)
 # include <dl-sysdep.h>		/* Defines RTLD_PRIVATE_ERRNO.  */
@@ -177,7 +178,7 @@
 # define DO_CALL(syscall_name, args)		\
     DOARGS_##args				\
     movl $SYS_ify (syscall_name), %eax;		\
-    syscall;
+    SYSCALLDB;
 
 # define DOARGS_0 /* nothing */
 # define DOARGS_1 /* nothing */
@@ -227,6 +239,6 @@
     LOAD_ARGS_##nr (args)						      \
     LOAD_REGS_##nr							      \
     asm volatile (							      \
-    "syscall\n\t"							      \
+    SYSCALLDB								      \
     : "=a" (resultvar)							      \
     : "0" (name) ASM_ARGS_##nr : "memory", REGISTERS_CLOBBERED_BY_SYSCALL);   \
@@ -241,7 +259,7 @@
     LOAD_ARGS_TYPES_##nr (args)						      \
     LOAD_REGS_TYPES_##nr (args)						      \
     asm volatile (							      \
-    "syscall\n\t"							      \
+    SYSCALLDB								      \
     : "=a" (resultvar)							      \
     : "0" (name) ASM_ARGS_##nr : "memory", REGISTERS_CLOBBERED_BY_SYSCALL);   \
     (long int) resultvar; })
diff -ruNp a/sysdeps/unix/sysv/linux/x86_64/vfork.S b/sysdeps/unix/sysv/linux/x86_64/vfork.S
--- a/sysdeps/unix/sysv/linux/x86_64/vfork.S
+++ b/sysdeps/unix/sysv/linux/x86_64/vfork.S
@@ -46,7 +46,7 @@ ENTRY (__vfork)
 
 	/* Stuff the syscall number in RAX and enter into the kernel.  */
 	movl	$SYS_ify (vfork), %eax
-	syscall
+	SYSCALLDB
 
 	/* Push back the return PC.  */
 	pushq	%rdi
diff -ruNp a/sysdeps/x86_64/dl-machine.h b/sysdeps/x86_64/dl-machine.h
--- a/sysdeps/x86_64/dl-machine.h
+++ b/sysdeps/x86_64/dl-machine.h
@@ -554,7 +554,8 @@ elf_machine_lazy_rel (struct link_map *m
 	value = ((ElfW(Addr) (*) (void)) value) ();
       *reloc_addr = value;
     }
-  else
+  /* for graphene, get around R_X86_64_NONE */
+  else if (__builtin_expect (r_type != R_X86_64_NONE, 1))
     _dl_reloc_bad_type (map, r_type, 1);
 }
 
diff -ruNp a/sysdeps/x86_64/nptl/tls.h b/sysdeps/x86_64/nptl/tls.h
--- a/sysdeps/x86_64/nptl/tls.h
+++ b/sysdeps/x86_64/nptl/tls.h
@@ -28,6 +28,7 @@
 # include <sysdep.h>
 # include <libc-internal.h>
 # include <kernel-features.h>
+# include <syscalldb.h>
 
 /* Replacement type for __m128 since this file is included by ld.so,
    which is compiled with -mno-sse.  It must not change the alignment
@@ -155,7 +160,7 @@ typedef struct
      _head->self = _thrdescr;						      \
 									      \
      /* It is a simple syscall to set the %fs value for the thread.  */	      \
-     asm volatile ("syscall"						      \
+     asm volatile (SYSCALLDB						      \
 		   : "=a" (_result)					      \
 		   : "0" ((unsigned long int) __NR_arch_prctl),		      \
 		     "D" ((unsigned long int) ARCH_SET_FS),		      \