[glibc] nptl: Increase default TCB alignment to 32

Florian Weimer fw@sourceware.org
Fri Dec 3 19:44:09 GMT 2021 

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=23c77f60181eb549f11ec2f913b4270af29eee38

commit 23c77f60181eb549f11ec2f913b4270af29eee38
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Dec 3 16:28:07 2021 +0100

    nptl: Increase default TCB alignment to 32
    
    rseq support will use a 32-byte aligned field in struct pthread,
    so the whole struct needs to have at least that alignment.
    
    nptl/tst-tls3mod.c uses TCB_ALIGNMENT, therefore include <descr.h>
    to obtain the fallback definition.
    
    Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

Diff:
---
 nptl/descr.h                         | 4 +++-
 nptl/tst-tls3mod.c                   | 1 +
 sysdeps/aarch64/nptl/pthreaddef.h    | 3 ---
 sysdeps/alpha/nptl/pthreaddef.h      | 3 ---
 sysdeps/arc/nptl/pthreaddef.h        | 3 ---
 sysdeps/arm/nptl/pthreaddef.h        | 3 ---
 sysdeps/csky/nptl/pthreaddef.h       | 3 ---
 sysdeps/ia64/nptl/pthreaddef.h       | 3 ---
 sysdeps/m68k/nptl/pthreaddef.h       | 3 ---
 sysdeps/microblaze/nptl/pthreaddef.h | 3 ---
 sysdeps/mips/nptl/pthreaddef.h       | 3 ---
 sysdeps/nios2/nptl/pthreaddef.h      | 3 ---
 sysdeps/powerpc/nptl/pthreaddef.h    | 3 ---
 sysdeps/riscv/nptl/pthreaddef.h      | 3 ---
 sysdeps/s390/nptl/pthreaddef.h       | 3 ---
 sysdeps/sh/nptl/pthreaddef.h         | 3 ---
 sysdeps/sparc/sparc32/pthreaddef.h   | 3 ---
 sysdeps/sparc/sparc64/pthreaddef.h   | 4 ----
 18 files changed, 4 insertions(+), 50 deletions(-)

diff --git a/nptl/descr.h b/nptl/descr.h
index 41ee56feb2..af2a6ab87a 100644
--- a/nptl/descr.h
+++ b/nptl/descr.h
@@ -36,7 +36,9 @@
 #include <tls-internal-struct.h>
 
 #ifndef TCB_ALIGNMENT
-# define TCB_ALIGNMENT	sizeof (double)
+# define TCB_ALIGNMENT 32
+#elif TCB_ALIGNMENT < 32
+# error TCB_ALIGNMENT must be at least 32
 #endif
 
 
diff --git a/nptl/tst-tls3mod.c b/nptl/tst-tls3mod.c
index 7090b41ce6..b2b218f7c9 100644
--- a/nptl/tst-tls3mod.c
+++ b/nptl/tst-tls3mod.c
@@ -23,6 +23,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <pthreaddef.h>
+#include <descr.h>
 
 
 extern pthread_barrier_t b;
diff --git a/sysdeps/aarch64/nptl/pthreaddef.h b/sysdeps/aarch64/nptl/pthreaddef.h
index 4d5ecf6661..8d9a10622d 100644
--- a/sysdeps/aarch64/nptl/pthreaddef.h
+++ b/sysdeps/aarch64/nptl/pthreaddef.h
@@ -28,8 +28,5 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK 2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT 16
-
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/alpha/nptl/pthreaddef.h b/sysdeps/alpha/nptl/pthreaddef.h
index 25edb5093e..660e5694a2 100644
--- a/sysdeps/alpha/nptl/pthreaddef.h
+++ b/sysdeps/alpha/nptl/pthreaddef.h
@@ -27,8 +27,5 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	4096
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/arc/nptl/pthreaddef.h b/sysdeps/arc/nptl/pthreaddef.h
index 873b9d149a..d4dbe9e079 100644
--- a/sysdeps/arc/nptl/pthreaddef.h
+++ b/sysdeps/arc/nptl/pthreaddef.h
@@ -28,8 +28,5 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		4
-
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/arm/nptl/pthreaddef.h b/sysdeps/arm/nptl/pthreaddef.h
index 332f4079c4..13769f5ae2 100644
--- a/sysdeps/arm/nptl/pthreaddef.h
+++ b/sysdeps/arm/nptl/pthreaddef.h
@@ -28,9 +28,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 
 /* Location of current stack frame.
 
diff --git a/sysdeps/csky/nptl/pthreaddef.h b/sysdeps/csky/nptl/pthreaddef.h
index e78bc0016b..7dde9131b9 100644
--- a/sysdeps/csky/nptl/pthreaddef.h
+++ b/sysdeps/csky/nptl/pthreaddef.h
@@ -28,8 +28,5 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		8
-
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/ia64/nptl/pthreaddef.h b/sysdeps/ia64/nptl/pthreaddef.h
index 3a0f6daf9a..c7420fd1e4 100644
--- a/sysdeps/ia64/nptl/pthreaddef.h
+++ b/sysdeps/ia64/nptl/pthreaddef.h
@@ -30,9 +30,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	16384
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__stack_pointer
diff --git a/sysdeps/m68k/nptl/pthreaddef.h b/sysdeps/m68k/nptl/pthreaddef.h
index cf46ed7a93..aefb3c5b22 100644
--- a/sysdeps/m68k/nptl/pthreaddef.h
+++ b/sysdeps/m68k/nptl/pthreaddef.h
@@ -27,9 +27,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/microblaze/nptl/pthreaddef.h b/sysdeps/microblaze/nptl/pthreaddef.h
index 517157444d..19d7235782 100644
--- a/sysdeps/microblaze/nptl/pthreaddef.h
+++ b/sysdeps/microblaze/nptl/pthreaddef.h
@@ -31,8 +31,5 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK  2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT       16
-
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME __builtin_frame_address (0)
diff --git a/sysdeps/mips/nptl/pthreaddef.h b/sysdeps/mips/nptl/pthreaddef.h
index a7bccef6e5..322591c293 100644
--- a/sysdeps/mips/nptl/pthreaddef.h
+++ b/sysdeps/mips/nptl/pthreaddef.h
@@ -27,9 +27,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/nios2/nptl/pthreaddef.h b/sysdeps/nios2/nptl/pthreaddef.h
index e01a0e6df7..aa0709d0dc 100644
--- a/sysdeps/nios2/nptl/pthreaddef.h
+++ b/sysdeps/nios2/nptl/pthreaddef.h
@@ -28,8 +28,5 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		4
-
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/powerpc/nptl/pthreaddef.h b/sysdeps/powerpc/nptl/pthreaddef.h
index ef5310e631..117c35229e 100644
--- a/sysdeps/powerpc/nptl/pthreaddef.h
+++ b/sysdeps/powerpc/nptl/pthreaddef.h
@@ -28,9 +28,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	4096
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/riscv/nptl/pthreaddef.h b/sysdeps/riscv/nptl/pthreaddef.h
index 7bf93d6a63..0f33cc48fe 100644
--- a/sysdeps/riscv/nptl/pthreaddef.h
+++ b/sysdeps/riscv/nptl/pthreaddef.h
@@ -28,8 +28,5 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/s390/nptl/pthreaddef.h b/sysdeps/s390/nptl/pthreaddef.h
index 091f82df24..0e32bd862f 100644
--- a/sysdeps/s390/nptl/pthreaddef.h
+++ b/sysdeps/s390/nptl/pthreaddef.h
@@ -28,9 +28,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/sh/nptl/pthreaddef.h b/sysdeps/sh/nptl/pthreaddef.h
index 3fa3d189ef..f4e3a290df 100644
--- a/sysdeps/sh/nptl/pthreaddef.h
+++ b/sysdeps/sh/nptl/pthreaddef.h
@@ -29,9 +29,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		8
-
 
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME	__builtin_frame_address (0)
diff --git a/sysdeps/sparc/sparc32/pthreaddef.h b/sysdeps/sparc/sparc32/pthreaddef.h
index 6526fb3d6e..7a0a04789d 100644
--- a/sysdeps/sparc/sparc32/pthreaddef.h
+++ b/sysdeps/sparc/sparc32/pthreaddef.h
@@ -27,9 +27,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	2048
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
 
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME  (stack_pointer + (2 * 64))
diff --git a/sysdeps/sparc/sparc64/pthreaddef.h b/sysdeps/sparc/sparc64/pthreaddef.h
index 3da9d7afc8..103842856d 100644
--- a/sysdeps/sparc/sparc64/pthreaddef.h
+++ b/sysdeps/sparc/sparc64/pthreaddef.h
@@ -27,10 +27,6 @@
 /* Minimal stack size after allocating thread descriptor and guard size.  */
 #define MINIMAL_REST_STACK	4096
 
-/* Alignment requirement for TCB.  */
-#define TCB_ALIGNMENT		16
-
-
 /* Location of current stack frame.  */
 #define CURRENT_STACK_FRAME  (stack_pointer + (2 * 128))
 register char *stack_pointer __asm__("%sp");

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