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>

2 files changed, 124 insertions, 107 deletions

diff --git a/sysdeps/i386/nptl/tcb-access.h b/sysdeps/i386/nptl/tcb-access.h
new file mode 100644
index 0000000..6c6d561
--- /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 cfb27f5..d010e14 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) \