nptl: Introduce <tcb-access.h> for THREAD_* accessors

These are common between most architectures.  Only the x86 targets
are outliers.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>

21 files changed, 301 insertions, 376 deletions

diff --git a/sysdeps/aarch64/nptl/tls.h b/sysdeps/aarch64/nptl/tls.h
index 72f22dc718..c9ae564bf2 100644
--- a/sysdeps/aarch64/nptl/tls.h
+++ b/sysdeps/aarch64/nptl/tls.h
@@ -98,15 +98,7 @@ typedef struct
 # define DB_THREAD_SELF \
   CONST_THREAD_AREA (64, sizeof (struct pthread))
 
-/* Access to data in the thread descriptor is easy.  */
-# define THREAD_GETMEM(descr, member) \
-  descr->member
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-# define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* Get and set the global scope generation counter in struct pthread.  */
 # define THREAD_GSCOPE_FLAG_UNUSED 0
diff --git a/sysdeps/alpha/nptl/tls.h b/sysdeps/alpha/nptl/tls.h
index 6328112135..eef922f268 100644
--- a/sysdeps/alpha/nptl/tls.h
+++ b/sysdeps/alpha/nptl/tls.h
@@ -92,15 +92,7 @@ typedef struct
 # define DB_THREAD_SELF \
   REGISTER (64, 64, 32 * 8, -sizeof (struct pthread))
 
-/* Access to data in the thread descriptor is easy.  */
-#define THREAD_GETMEM(descr, member) \
-  descr->member
-#define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-#define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-#define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* Get and set the global scope generation counter in struct pthread.  */
 #define THREAD_GSCOPE_FLAG_UNUSED 0
diff --git a/sysdeps/arc/nptl/tls.h b/sysdeps/arc/nptl/tls.h
index e269c0a7a5..f6853867b2 100644
--- a/sysdeps/arc/nptl/tls.h
+++ b/sysdeps/arc/nptl/tls.h
@@ -100,15 +100,7 @@ typedef struct
 # define DB_THREAD_SELF \
   CONST_THREAD_AREA (32, sizeof (struct pthread))
 
-/* Access to data in the thread descriptor is easy.  */
-# define THREAD_GETMEM(descr, member) \
-  descr->member
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-# define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* Get and set the global scope generation counter in struct pthread.  */
 #define THREAD_GSCOPE_FLAG_UNUSED 0
diff --git a/sysdeps/arm/nptl/tls.h b/sysdeps/arm/nptl/tls.h
index 699c16acfb..06612b5449 100644
--- a/sysdeps/arm/nptl/tls.h
+++ b/sysdeps/arm/nptl/tls.h
@@ -89,15 +89,7 @@ typedef struct
 # define DB_THREAD_SELF \
   CONST_THREAD_AREA (32, sizeof (struct pthread))
 
-/* Access to data in the thread descriptor is easy.  */
-#define THREAD_GETMEM(descr, member) \
-  descr->member
-#define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-#define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-#define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* Get and set the global scope generation counter in struct pthread.  */
 #define THREAD_GSCOPE_FLAG_UNUSED 0
diff --git a/sysdeps/csky/nptl/tls.h b/sysdeps/csky/nptl/tls.h
index b210dfcb76..39fd640459 100644
--- a/sysdeps/csky/nptl/tls.h
+++ b/sysdeps/csky/nptl/tls.h
@@ -116,15 +116,7 @@ typedef struct
 # define DB_THREAD_SELF \
   CONST_THREAD_AREA (32, sizeof (struct pthread))
 
-/* Access to data in the thread descriptor is easy.  */
-# define THREAD_GETMEM(descr, member) \
-  descr->member
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-# define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* Get and set the global scope generation counter in struct pthread.  */
 # define THREAD_GSCOPE_FLAG_UNUSED 0
diff --git a/sysdeps/hppa/nptl/tls.h b/sysdeps/hppa/nptl/tls.h
index 55559eb327..5f550227f2 100644
--- a/sysdeps/hppa/nptl/tls.h
+++ b/sysdeps/hppa/nptl/tls.h
@@ -107,15 +107,7 @@ typedef struct
 # define DB_THREAD_SELF \
   REGISTER (32, 32, 53 * 4, -sizeof (struct pthread))
 
-/* Access to data in the thread descriptor is easy.  */
-# define THREAD_GETMEM(descr, member) \
-  descr->member
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-# define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 static inline struct pthread *__get_cr27(void)
 {
diff --git a/sysdeps/i386/nptl/tcb-access.h b/sysdeps/i386/nptl/tcb-access.h
new file mode 100644
index 0000000000..6c6d561e39
--- /dev/null
+++ b/sysdeps/i386/nptl/tcb-access.h
@@ -0,0 +1,123 @@
+/* THREAD_* accessors.  i386 version.
+   Copyright (C) 2002-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Read member of the thread descriptor directly.  */
+#define THREAD_GETMEM(descr, member) \
+  ({ __typeof (descr->member) __value;					      \
+     _Static_assert (sizeof (__value) == 1				      \
+		     || sizeof (__value) == 4				      \
+		     || sizeof (__value) == 8,				      \
+		     "size of per-thread data");			      \
+     if (sizeof (__value) == 1)						      \
+       asm volatile ("movb %%gs:%P2,%b0"				      \
+		     : "=q" (__value)					      \
+		     : "0" (0), "i" (offsetof (struct pthread, member)));     \
+     else if (sizeof (__value) == 4)					      \
+       asm volatile ("movl %%gs:%P1,%0"					      \
+		     : "=r" (__value)					      \
+		     : "i" (offsetof (struct pthread, member)));	      \
+     else /* 8 */								      \
+       {								      \
+	 asm volatile ("movl %%gs:%P1,%%eax\n\t"			      \
+		       "movl %%gs:%P2,%%edx"				      \
+		       : "=A" (__value)					      \
+		       : "i" (offsetof (struct pthread, member)),	      \
+			 "i" (offsetof (struct pthread, member) + 4));	      \
+       }								      \
+     __value; })
+
+
+/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
+#define THREAD_GETMEM_NC(descr, member, idx) \
+  ({ __typeof (descr->member[0]) __value;				      \
+     _Static_assert (sizeof (__value) == 1				      \
+		     || sizeof (__value) == 4				      \
+		     || sizeof (__value) == 8,				      \
+		     "size of per-thread data");			      \
+     if (sizeof (__value) == 1)						      \
+       asm volatile ("movb %%gs:%P2(%3),%b0"				      \
+		     : "=q" (__value)					      \
+		     : "0" (0), "i" (offsetof (struct pthread, member[0])),   \
+		     "r" (idx));					      \
+     else if (sizeof (__value) == 4)					      \
+       asm volatile ("movl %%gs:%P1(,%2,4),%0"				      \
+		     : "=r" (__value)					      \
+		     : "i" (offsetof (struct pthread, member[0])),	      \
+		       "r" (idx));					      \
+     else /* 8 */							      \
+       {								      \
+	 asm volatile  ("movl %%gs:%P1(,%2,8),%%eax\n\t"		      \
+			"movl %%gs:4+%P1(,%2,8),%%edx"			      \
+			: "=&A" (__value)				      \
+			: "i" (offsetof (struct pthread, member[0])),	      \
+			  "r" (idx));					      \
+       }								      \
+     __value; })
+
+
+
+/* Set member of the thread descriptor directly.  */
+#define THREAD_SETMEM(descr, member, value) \
+  ({									      \
+     _Static_assert (sizeof (descr->member) == 1			      \
+		     || sizeof (descr->member) == 4			      \
+		     || sizeof (descr->member) == 8,			      \
+		     "size of per-thread data");			      \
+     if (sizeof (descr->member) == 1)					      \
+       asm volatile ("movb %b0,%%gs:%P1" :				      \
+		     : "iq" (value),					      \
+		       "i" (offsetof (struct pthread, member)));	      \
+     else if (sizeof (descr->member) == 4)				      \
+       asm volatile ("movl %0,%%gs:%P1" :				      \
+		     : "ir" (value),					      \
+		       "i" (offsetof (struct pthread, member)));	      \
+     else /* 8 */							      \
+       {								      \
+	 asm volatile ("movl %%eax,%%gs:%P1\n\t"			      \
+		       "movl %%edx,%%gs:%P2" :				      \
+		       : "A" ((uint64_t) cast_to_integer (value)),	      \
+			 "i" (offsetof (struct pthread, member)),	      \
+			 "i" (offsetof (struct pthread, member) + 4));	      \
+       }})
+
+
+/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
+#define THREAD_SETMEM_NC(descr, member, idx, value) \
+  ({									      \
+     _Static_assert (sizeof (descr->member[0]) == 1			      \
+		     || sizeof (descr->member[0]) == 4			      \
+		     || sizeof (descr->member[0]) == 8,			      \
+		     "size of per-thread data");			      \
+     if (sizeof (descr->member[0]) == 1)				      \
+       asm volatile ("movb %b0,%%gs:%P1(%2)" :				      \
+		     : "iq" (value),					      \
+		       "i" (offsetof (struct pthread, member)),		      \
+		       "r" (idx));					      \
+     else if (sizeof (descr->member[0]) == 4)				      \
+       asm volatile ("movl %0,%%gs:%P1(,%2,4)" :			      \
+		     : "ir" (value),					      \
+		       "i" (offsetof (struct pthread, member)),		      \
+		       "r" (idx));					      \
+     else /* 8 */							      \
+       {								      \
+	 asm volatile ("movl %%eax,%%gs:%P1(,%2,8)\n\t"			      \
+		       "movl %%edx,%%gs:4+%P1(,%2,8)" :			      \
+		       : "A" ((uint64_t) cast_to_integer (value)),	      \
+			 "i" (offsetof (struct pthread, member)),	      \
+			 "r" (idx));					      \
+       }})
diff --git a/sysdeps/i386/nptl/tls.h b/sysdeps/i386/nptl/tls.h
index cfb27f5ccd..d010e14920 100644
--- a/sysdeps/i386/nptl/tls.h
+++ b/sysdeps/i386/nptl/tls.h
@@ -250,113 +250,7 @@ tls_fill_user_desc (union user_desc_init *desc,
   REGISTER_THREAD_AREA (32, offsetof (struct user_regs_struct, xgs), 3) \
   REGISTER_THREAD_AREA (64, 26 * 8, 3) /* x86-64's user_regs_struct->gs */
 
-
-/* Read member of the thread descriptor directly.  */
-# define THREAD_GETMEM(descr, member) \
-  ({ __typeof (descr->member) __value;					      \
-     _Static_assert (sizeof (__value) == 1				      \
-		     || sizeof (__value) == 4				      \
-		     || sizeof (__value) == 8,				      \
-		     "size of per-thread data");			      \
-     if (sizeof (__value) == 1)						      \
-       asm volatile ("movb %%gs:%P2,%b0"				      \
-		     : "=q" (__value)					      \
-		     : "0" (0), "i" (offsetof (struct pthread, member)));     \
-     else if (sizeof (__value) == 4)					      \
-       asm volatile ("movl %%gs:%P1,%0"					      \
-		     : "=r" (__value)					      \
-		     : "i" (offsetof (struct pthread, member)));	      \
-     else /* 8 */								      \
-       {								      \
-	 asm volatile ("movl %%gs:%P1,%%eax\n\t"			      \
-		       "movl %%gs:%P2,%%edx"				      \
-		       : "=A" (__value)					      \
-		       : "i" (offsetof (struct pthread, member)),	      \
-			 "i" (offsetof (struct pthread, member) + 4));	      \
-       }								      \
-     __value; })
-
-
-/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  ({ __typeof (descr->member[0]) __value;				      \
-     _Static_assert (sizeof (__value) == 1				      \
-		     || sizeof (__value) == 4				      \
-		     || sizeof (__value) == 8,				      \
-		     "size of per-thread data");			      \
-     if (sizeof (__value) == 1)						      \
-       asm volatile ("movb %%gs:%P2(%3),%b0"				      \
-		     : "=q" (__value)					      \
-		     : "0" (0), "i" (offsetof (struct pthread, member[0])),   \
-		     "r" (idx));					      \
-     else if (sizeof (__value) == 4)					      \
-       asm volatile ("movl %%gs:%P1(,%2,4),%0"				      \
-		     : "=r" (__value)					      \
-		     : "i" (offsetof (struct pthread, member[0])),	      \
-		       "r" (idx));					      \
-     else /* 8 */							      \
-       {								      \
-	 asm volatile  ("movl %%gs:%P1(,%2,8),%%eax\n\t"		      \
-			"movl %%gs:4+%P1(,%2,8),%%edx"			      \
-			: "=&A" (__value)				      \
-			: "i" (offsetof (struct pthread, member[0])),	      \
-			  "r" (idx));					      \
-       }								      \
-     __value; })
-
-
-
-/* Set member of the thread descriptor directly.  */
-# define THREAD_SETMEM(descr, member, value) \
-  ({									      \
-     _Static_assert (sizeof (descr->member) == 1			      \
-		     || sizeof (descr->member) == 4			      \
-		     || sizeof (descr->member) == 8,			      \
-		     "size of per-thread data");			      \
-     if (sizeof (descr->member) == 1)					      \
-       asm volatile ("movb %b0,%%gs:%P1" :				      \
-		     : "iq" (value),					      \
-		       "i" (offsetof (struct pthread, member)));	      \
-     else if (sizeof (descr->member) == 4)				      \
-       asm volatile ("movl %0,%%gs:%P1" :				      \
-		     : "ir" (value),					      \
-		       "i" (offsetof (struct pthread, member)));	      \
-     else /* 8 */							      \
-       {								      \
-	 asm volatile ("movl %%eax,%%gs:%P1\n\t"			      \
-		       "movl %%edx,%%gs:%P2" :				      \
-		       : "A" ((uint64_t) cast_to_integer (value)),	      \
-			 "i" (offsetof (struct pthread, member)),	      \
-			 "i" (offsetof (struct pthread, member) + 4));	      \
-       }})
-
-
-/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  ({									      \
-     _Static_assert (sizeof (descr->member[0]) == 1			      \
-		     || sizeof (descr->member[0]) == 4			      \
-		     || sizeof (descr->member[0]) == 8,			      \
-		     "size of per-thread data");			      \
-     if (sizeof (descr->member[0]) == 1)				      \
-       asm volatile ("movb %b0,%%gs:%P1(%2)" :				      \
-		     : "iq" (value),					      \
-		       "i" (offsetof (struct pthread, member)),		      \
-		       "r" (idx));					      \
-     else if (sizeof (descr->member[0]) == 4)				      \
-       asm volatile ("movl %0,%%gs:%P1(,%2,4)" :			      \
-		     : "ir" (value),					      \
-		       "i" (offsetof (struct pthread, member)),		      \
-		       "r" (idx));					      \
-     else /* 8 */							      \
-       {								      \
-	 asm volatile ("movl %%eax,%%gs:%P1(,%2,8)\n\t"			      \
-		       "movl %%edx,%%gs:4+%P1(,%2,8)" :			      \
-		       : "A" ((uint64_t) cast_to_integer (value)),	      \
-			 "i" (offsetof (struct pthread, member)),	      \
-			 "r" (idx));					      \
-       }})
-
+# include <tcb-access.h>
 
 /* Set the stack guard field in TCB head.  */
 #define THREAD_SET_STACK_GUARD(value) \
diff --git a/sysdeps/ia64/nptl/tls.h b/sysdeps/ia64/nptl/tls.h
index 8c26728859..44951da24b 100644
--- a/sysdeps/ia64/nptl/tls.h
+++ b/sysdeps/ia64/nptl/tls.h
@@ -128,15 +128,7 @@ register struct pthread *__thread_self __asm__("r13");
 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 # define DB_THREAD_SELF REGISTER (64, 64, 13 * 8, -TLS_PRE_TCB_SIZE)
 
-/* Access to data in the thread descriptor is easy.  */
-#define THREAD_GETMEM(descr, member) \
-  descr->member
-#define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-#define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-#define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* Set the stack guard field in TCB head.  */
 #define THREAD_SET_STACK_GUARD(value) \
diff --git a/sysdeps/m68k/nptl/tls.h b/sysdeps/m68k/nptl/tls.h
index 34906b1c13..257af6bddc 100644
--- a/sysdeps/m68k/nptl/tls.h
+++ b/sysdeps/m68k/nptl/tls.h
@@ -117,15 +117,7 @@ extern void * __m68k_read_tp (void);
 # define DB_THREAD_SELF \
   CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE)
 
-/* Access to data in the thread descriptor is easy.  */
-# define THREAD_GETMEM(descr, member) \
-  descr->member
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-# define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* l_tls_offset == 0 is perfectly valid on M68K, so we have to use some
    different value to mean unset l_tls_offset.  */
diff --git a/sysdeps/microblaze/nptl/tls.h b/sysdeps/microblaze/nptl/tls.h
index 0ca67a777d..a31703b247 100644
--- a/sysdeps/microblaze/nptl/tls.h
+++ b/sysdeps/microblaze/nptl/tls.h
@@ -100,20 +100,7 @@ typedef struct
 # define DB_THREAD_SELF \
   CONST_THREAD_AREA (32, sizeof (struct pthread))
 
-/* Read member of the thread descriptor directly.  */
-# define THREAD_GETMEM(descr, member) (descr->member)
-
-/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  (descr->member[idx])
-
-/* Set member of the thread descriptor directly.  */
-# define THREAD_SETMEM(descr, member, value) \
-  (descr->member = (value))
-
-/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  (descr->member[idx] = (value))
+# include <tcb-access.h>
 
 /* Get and set the global scope generation counter in struct pthread.  */
 # define THREAD_GSCOPE_FLAG_UNUSED 0
diff --git a/sysdeps/mips/nptl/tls.h b/sysdeps/mips/nptl/tls.h
index 04e823b4c7..afb8308e1b 100644
--- a/sysdeps/mips/nptl/tls.h
+++ b/sysdeps/mips/nptl/tls.h
@@ -144,14 +144,7 @@ typedef struct
   CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE)
 
 /* Access to data in the thread descriptor is easy.  */
-# define THREAD_GETMEM(descr, member) \
-  descr->member
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-# define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* l_tls_offset == 0 is perfectly valid on MIPS, so we have to use some
    different value to mean unset l_tls_offset.  */
diff --git a/sysdeps/nios2/nptl/tls.h b/sysdeps/nios2/nptl/tls.h
index fd484135f4..173c395449 100644
--- a/sysdeps/nios2/nptl/tls.h
+++ b/sysdeps/nios2/nptl/tls.h
@@ -112,15 +112,7 @@ register struct pthread *__thread_self __asm__("r23");
 # define DB_THREAD_SELF \
   REGISTER (32, 32, 23 * 4, -TLS_PRE_TCB_SIZE - TLS_TCB_OFFSET)
 
-/* Access to data in the thread descriptor is easy.  */
-# define THREAD_GETMEM(descr, member) \
-  descr->member
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-# define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 # define THREAD_GET_POINTER_GUARD()				\
   (((tcbhead_t *) (READ_THREAD_POINTER ()			\
diff --git a/sysdeps/nptl/tcb-access.h b/sysdeps/nptl/tcb-access.h
new file mode 100644
index 0000000000..b4137b8ab8
--- /dev/null
+++ b/sysdeps/nptl/tcb-access.h
@@ -0,0 +1,30 @@
+/* THREAD_* accessors.  Generic version based on struct pthread pointers.
+   Copyright (C) 2002-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Note: These are for accessing the TCB of the *current* thread.
+   descr can be disregarded on some targets as an optimization.  See
+   i386 for an example.  */
+
+#define THREAD_GETMEM(descr, member) \
+  descr->member
+#define THREAD_GETMEM_NC(descr, member, idx) \
+  descr->member[idx]
+#define THREAD_SETMEM(descr, member, value) \
+  descr->member = (value)
+#define THREAD_SETMEM_NC(descr, member, idx, value) \
+  descr->member[idx] = (value)
diff --git a/sysdeps/powerpc/nptl/tls.h b/sysdeps/powerpc/nptl/tls.h
index cc93c44964..7d2f16dcf2 100644
--- a/sysdeps/powerpc/nptl/tls.h
+++ b/sysdeps/powerpc/nptl/tls.h
@@ -176,20 +176,7 @@ typedef struct
   REGISTER (64, 64, PT_THREAD_POINTER * 8,				      \
 	    - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
 
-/* Read member of the thread descriptor directly.  */
-# define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member)
-
-/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
-# define THREAD_GETMEM_NC(descr, member, idx) \
-    ((void)(descr), (THREAD_SELF)->member[idx])
-
-/* Set member of the thread descriptor directly.  */
-# define THREAD_SETMEM(descr, member, value) \
-    ((void)(descr), (THREAD_SELF)->member = (value))
-
-/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-    ((void)(descr), (THREAD_SELF)->member[idx] = (value))
+# include <tcb-access.h>
 
 /* Set the stack guard field in TCB head.  */
 # define THREAD_SET_STACK_GUARD(value) \
diff --git a/sysdeps/riscv/nptl/tls.h b/sysdeps/riscv/nptl/tls.h
index e4bd736feb..a966d440c5 100644
--- a/sysdeps/riscv/nptl/tls.h
+++ b/sysdeps/riscv/nptl/tls.h
@@ -105,14 +105,7 @@ typedef struct
   REGISTER (64, 64, 4 * 8, - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
 
 /* Access to data in the thread descriptor is easy.  */
-# define THREAD_GETMEM(descr, member) \
-  descr->member
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-# define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* l_tls_offset == 0 is perfectly valid, so we have to use some different
    value to mean unset l_tls_offset.  */
diff --git a/sysdeps/s390/nptl/tls.h b/sysdeps/s390/nptl/tls.h
index 804486dfdd..16c5811e06 100644
--- a/sysdeps/s390/nptl/tls.h
+++ b/sysdeps/s390/nptl/tls.h
@@ -135,15 +135,7 @@ typedef struct
 # define DB_THREAD_SELF REGISTER (32, 32, 18 * 4, 0) \
 			REGISTER (64, __WORDSIZE, 18 * 8, 0)
 
-/* Access to data in the thread descriptor is easy.  */
-#define THREAD_GETMEM(descr, member) \
-  descr->member
-#define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-#define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-#define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* Set the stack guard field in TCB head.  */
 #define THREAD_SET_STACK_GUARD(value) \
diff --git a/sysdeps/sh/nptl/tls.h b/sysdeps/sh/nptl/tls.h
index 2a9ee1def1..aadd5be022 100644
--- a/sysdeps/sh/nptl/tls.h
+++ b/sysdeps/sh/nptl/tls.h
@@ -113,19 +113,7 @@ typedef struct
 # define DB_THREAD_SELF \
   REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread))
 
-/* Read member of the thread descriptor directly.  */
-# define THREAD_GETMEM(descr, member) (descr->member)
-
-/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
-# define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx])
-
-/* Set member of the thread descriptor directly.  */
-# define THREAD_SETMEM(descr, member, value) \
-    descr->member = (value)
-
-/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-    descr->member[idx] = (value)
+# include <tcb-access.h>
 
 #define THREAD_GET_POINTER_GUARD() \
   ({ tcbhead_t *__tcbp;							      \
diff --git a/sysdeps/sparc/nptl/tls.h b/sysdeps/sparc/nptl/tls.h
index 55955f376a..d4e6e525d9 100644
--- a/sysdeps/sparc/nptl/tls.h
+++ b/sysdeps/sparc/nptl/tls.h
@@ -112,15 +112,7 @@ register struct pthread *__thread_self __asm__("%g7");
   REGISTER (32, 32, 10 * 4, 0) \
   REGISTER (64, __WORDSIZE, (6 * 8) + (__WORDSIZE==64?0:4), 0)
 
-/* Access to data in the thread descriptor is easy.  */
-#define THREAD_GETMEM(descr, member) \
-  descr->member
-#define THREAD_GETMEM_NC(descr, member, idx) \
-  descr->member[idx]
-#define THREAD_SETMEM(descr, member, value) \
-  descr->member = (value)
-#define THREAD_SETMEM_NC(descr, member, idx, value) \
-  descr->member[idx] = (value)
+# include <tcb-access.h>
 
 /* Set the stack guard field in TCB head.  */
 #define THREAD_SET_STACK_GUARD(value) \
diff --git a/sysdeps/x86_64/nptl/tcb-access.h b/sysdeps/x86_64/nptl/tcb-access.h
new file mode 100644
index 0000000000..18848a729d
--- /dev/null
+++ b/sysdeps/x86_64/nptl/tcb-access.h
@@ -0,0 +1,130 @@
+/* THREAD_* accessors.  x86_64 version.
+   Copyright (C) 2002-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Read member of the thread descriptor directly.  */
+# define THREAD_GETMEM(descr, member) \
+  ({ __typeof (descr->member) __value;					      \
+     _Static_assert (sizeof (__value) == 1				      \
+		     || sizeof (__value) == 4				      \
+		     || sizeof (__value) == 8,				      \
+		     "size of per-thread data");			      \
+     if (sizeof (__value) == 1)						      \
+       asm volatile ("movb %%fs:%P2,%b0"				      \
+		     : "=q" (__value)					      \
+		     : "0" (0), "i" (offsetof (struct pthread, member)));     \
+     else if (sizeof (__value) == 4)					      \
+       asm volatile ("movl %%fs:%P1,%0"					      \
+		     : "=r" (__value)					      \
+		     : "i" (offsetof (struct pthread, member)));	      \
+     else /* 8 */								      \
+       {								      \
+	 asm volatile ("movq %%fs:%P1,%q0"				      \
+		       : "=r" (__value)					      \
+		       : "i" (offsetof (struct pthread, member)));	      \
+       }								      \
+     __value; })
+
+
+/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
+# define THREAD_GETMEM_NC(descr, member, idx) \
+  ({ __typeof (descr->member[0]) __value;				      \
+     _Static_assert (sizeof (__value) == 1				      \
+		     || sizeof (__value) == 4				      \
+		     || sizeof (__value) == 8,				      \
+		     "size of per-thread data");			      \
+     if (sizeof (__value) == 1)						      \
+       asm volatile ("movb %%fs:%P2(%q3),%b0"				      \
+		     : "=q" (__value)					      \
+		     : "0" (0), "i" (offsetof (struct pthread, member[0])),   \
+		       "r" (idx));					      \
+     else if (sizeof (__value) == 4)					      \
+       asm volatile ("movl %%fs:%P1(,%q2,4),%0"				      \
+		     : "=r" (__value)					      \
+		     : "i" (offsetof (struct pthread, member[0])), "r" (idx));\
+     else /* 8 */							      \
+       {								      \
+	 asm volatile ("movq %%fs:%P1(,%q2,8),%q0"			      \
+		       : "=r" (__value)					      \
+		       : "i" (offsetof (struct pthread, member[0])),	      \
+			 "r" (idx));					      \
+       }								      \
+     __value; })
+
+
+/* Loading addresses of objects on x86-64 needs to be treated special
+   when generating PIC code.  */
+#ifdef __pic__
+# define IMM_MODE "nr"
+#else
+# define IMM_MODE "ir"
+#endif
+
+
+/* Set member of the thread descriptor directly.  */
+# define THREAD_SETMEM(descr, member, value) \
+  ({									      \
+     _Static_assert (sizeof (descr->member) == 1			      \
+		     || sizeof (descr->member) == 4			      \
+		     || sizeof (descr->member) == 8,			      \
+		     "size of per-thread data");			      \
+     if (sizeof (descr->member) == 1)					      \
+       asm volatile ("movb %b0,%%fs:%P1" :				      \
+		     : "iq" (value),					      \
+		       "i" (offsetof (struct pthread, member)));	      \
+     else if (sizeof (descr->member) == 4)				      \
+       asm volatile ("movl %0,%%fs:%P1" :				      \
+		     : IMM_MODE (value),				      \
+		       "i" (offsetof (struct pthread, member)));	      \
+     else /* 8 */							      \
+       {								      \
+	 /* Since movq takes a signed 32-bit immediate or a register source   \
+	    operand, use "er" constraint for 32-bit signed integer constant   \
+	    or register.  */						      \
+	 asm volatile ("movq %q0,%%fs:%P1" :				      \
+		       : "er" ((uint64_t) cast_to_integer (value)),	      \
+			 "i" (offsetof (struct pthread, member)));	      \
+       }})
+
+
+/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
+# define THREAD_SETMEM_NC(descr, member, idx, value) \
+  ({									      \
+     _Static_assert (sizeof (descr->member[0]) == 1			      \
+		     || sizeof (descr->member[0]) == 4			      \
+		     || sizeof (descr->member[0]) == 8,			      \
+		     "size of per-thread data");			      \
+     if (sizeof (descr->member[0]) == 1)				      \
+       asm volatile ("movb %b0,%%fs:%P1(%q2)" :				      \
+		     : "iq" (value),					      \
+		       "i" (offsetof (struct pthread, member[0])),	      \
+		       "r" (idx));					      \
+     else if (sizeof (descr->member[0]) == 4)				      \
+       asm volatile ("movl %0,%%fs:%P1(,%q2,4)" :			      \
+		     : IMM_MODE (value),				      \
+		       "i" (offsetof (struct pthread, member[0])),	      \
+		       "r" (idx));					      \
+     else /* 8 */							      \
+       {								      \
+	 /* Since movq takes a signed 32-bit immediate or a register source   \
+	    operand, use "er" constraint for 32-bit signed integer constant   \
+	    or register.  */						      \
+	 asm volatile ("movq %q0,%%fs:%P1(,%q2,8)" :			      \
+		       : "er" ((uint64_t) cast_to_integer (value)),	      \
+			 "i" (offsetof (struct pthread, member[0])),	      \
+			 "r" (idx));					      \
+       }})
diff --git a/sysdeps/x86_64/nptl/tls.h b/sysdeps/x86_64/nptl/tls.h
index b0d044353b..a39579897c 100644
--- a/sysdeps/x86_64/nptl/tls.h
+++ b/sysdeps/x86_64/nptl/tls.h
@@ -195,119 +195,7 @@ _Static_assert (offsetof (tcbhead_t, __glibc_unused2) == 0x80,
 # define DB_THREAD_SELF_INCLUDE  <sys/reg.h> /* For the FS constant.  */
 # define DB_THREAD_SELF CONST_THREAD_AREA (64, FS)
 
-/* Read member of the thread descriptor directly.  */
-# define THREAD_GETMEM(descr, member) \
-  ({ __typeof (descr->member) __value;					      \
-     _Static_assert (sizeof (__value) == 1				      \
-		     || sizeof (__value) == 4				      \
-		     || sizeof (__value) == 8,				      \
-		     "size of per-thread data");			      \
-     if (sizeof (__value) == 1)						      \
-       asm volatile ("movb %%fs:%P2,%b0"				      \
-		     : "=q" (__value)					      \
-		     : "0" (0), "i" (offsetof (struct pthread, member)));     \
-     else if (sizeof (__value) == 4)					      \
-       asm volatile ("movl %%fs:%P1,%0"					      \
-		     : "=r" (__value)					      \
-		     : "i" (offsetof (struct pthread, member)));	      \
-     else /* 8 */								      \
-       {								      \
-	 asm volatile ("movq %%fs:%P1,%q0"				      \
-		       : "=r" (__value)					      \
-		       : "i" (offsetof (struct pthread, member)));	      \
-       }								      \
-     __value; })
-
-
-/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
-# define THREAD_GETMEM_NC(descr, member, idx) \
-  ({ __typeof (descr->member[0]) __value;				      \
-     _Static_assert (sizeof (__value) == 1				      \
-		     || sizeof (__value) == 4				      \
-		     || sizeof (__value) == 8,				      \
-		     "size of per-thread data");			      \
-     if (sizeof (__value) == 1)						      \
-       asm volatile ("movb %%fs:%P2(%q3),%b0"				      \
-		     : "=q" (__value)					      \
-		     : "0" (0), "i" (offsetof (struct pthread, member[0])),   \
-		       "r" (idx));					      \
-     else if (sizeof (__value) == 4)					      \
-       asm volatile ("movl %%fs:%P1(,%q2,4),%0"				      \
-		     : "=r" (__value)					      \
-		     : "i" (offsetof (struct pthread, member[0])), "r" (idx));\
-     else /* 8 */							      \
-       {								      \
-	 asm volatile ("movq %%fs:%P1(,%q2,8),%q0"			      \
-		       : "=r" (__value)					      \
-		       : "i" (offsetof (struct pthread, member[0])),	      \
-			 "r" (idx));					      \
-       }								      \
-     __value; })
-
-
-/* Loading addresses of objects on x86-64 needs to be treated special
-   when generating PIC code.  */
-#ifdef __pic__
-# define IMM_MODE "nr"
-#else
-# define IMM_MODE "ir"
-#endif
-
-
-/* Set member of the thread descriptor directly.  */
-# define THREAD_SETMEM(descr, member, value) \
-  ({									      \
-     _Static_assert (sizeof (descr->member) == 1			      \
-		     || sizeof (descr->member) == 4			      \
-		     || sizeof (descr->member) == 8,			      \
-		     "size of per-thread data");			      \
-     if (sizeof (descr->member) == 1)					      \
-       asm volatile ("movb %b0,%%fs:%P1" :				      \
-		     : "iq" (value),					      \
-		       "i" (offsetof (struct pthread, member)));	      \
-     else if (sizeof (descr->member) == 4)				      \
-       asm volatile ("movl %0,%%fs:%P1" :				      \
-		     : IMM_MODE (value),				      \
-		       "i" (offsetof (struct pthread, member)));	      \
-     else /* 8 */							      \
-       {								      \
-	 /* Since movq takes a signed 32-bit immediate or a register source   \
-	    operand, use "er" constraint for 32-bit signed integer constant   \
-	    or register.  */						      \
-	 asm volatile ("movq %q0,%%fs:%P1" :				      \
-		       : "er" ((uint64_t) cast_to_integer (value)),	      \
-			 "i" (offsetof (struct pthread, member)));	      \
-       }})
-
-
-/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
-  ({									      \
-     _Static_assert (sizeof (descr->member[0]) == 1			      \
-		     || sizeof (descr->member[0]) == 4			      \
-		     || sizeof (descr->member[0]) == 8,			      \
-		     "size of per-thread data");			      \
-     if (sizeof (descr->member[0]) == 1)				      \
-       asm volatile ("movb %b0,%%fs:%P1(%q2)" :				      \
-		     : "iq" (value),					      \
-		       "i" (offsetof (struct pthread, member[0])),	      \
-		       "r" (idx));					      \
-     else if (sizeof (descr->member[0]) == 4)				      \
-       asm volatile ("movl %0,%%fs:%P1(,%q2,4)" :			      \
-		     : IMM_MODE (value),				      \
-		       "i" (offsetof (struct pthread, member[0])),	      \
-		       "r" (idx));					      \
-     else /* 8 */							      \
-       {								      \
-	 /* Since movq takes a signed 32-bit immediate or a register source   \
-	    operand, use "er" constraint for 32-bit signed integer constant   \
-	    or register.  */						      \
-	 asm volatile ("movq %q0,%%fs:%P1(,%q2,8)" :			      \
-		       : "er" ((uint64_t) cast_to_integer (value)),	      \
-			 "i" (offsetof (struct pthread, member[0])),	      \
-			 "r" (idx));					      \
-       }})
-
+# include <tcb-access.h>
 
 /* Set the stack guard field in TCB head.  */
 # define THREAD_SET_STACK_GUARD(value) \