public inbox for glibc-cvs@sourceware.org
help / color / mirror / Atom feed
* [glibc/release/2.34/master] elf: Drop elf/tls-macros.h in favor of __thread and tls_model attributes [BZ #28152] [BZ #28205]
@ 2023-01-10 19:37 Florian Weimer
0 siblings, 0 replies; only message in thread
From: Florian Weimer @ 2023-01-10 19:37 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bbe4bbb6e8997b5ff9843bd3f32ac77dbaec7284
commit bbe4bbb6e8997b5ff9843bd3f32ac77dbaec7284
Author: Fangrui Song <maskray@google.com>
Date: Mon Aug 16 09:59:30 2021 -0700
elf: Drop elf/tls-macros.h in favor of __thread and tls_model attributes [BZ #28152] [BZ #28205]
elf/tls-macros.h was added for TLS testing when GCC did not support
__thread. __thread and tls_model attributes are mature now and have been
used by many newer tests.
Also delete tst-tls2.c which tests .tls_common (unused by modern GCC and
unsupported by Clang/LLD). .tls_common and .tbss definition are almost
identical after linking, so the runtime test doesn't add additional
coverage. Assembler and linker tests should be on the binutils side.
When LLD 13.0.0 is allowed in configure.ac
(https://sourceware.org/pipermail/libc-alpha/2021-August/129866.html),
`make check` result is on par with glibc built with GNU ld on aarch64
and x86_64.
As a future clean-up, TLS_GD/TLS_LD/TLS_IE/TLS_IE macros can be removed from
sysdeps/*/tls-macros.h. We can add optional -mtls-dialect={gnu2,trad}
tests to ensure coverage.
Tested on aarch64-linux-gnu, powerpc64le-linux-gnu, and x86_64-linux-gnu.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
(cherry picked from commit 33c50ef42878b07ee6ead8b3f1a81d8c2c74697c)
Diff:
---
elf/Makefile | 2 -
elf/tls-macros.h | 25 -----------
elf/tst-tls1.c | 64 +++++++++++-----------------
elf/tst-tls2.c | 82 ------------------------------------
elf/tst-tls3.c | 26 +++++-------
elf/tst-tlsmod1.c | 24 +++++------
elf/tst-tlsmod2.c | 6 +--
elf/tst-tlsmod3.c | 8 ++--
elf/tst-tlsmod4.c | 6 +--
elf/tst-tlsmod5.c | 4 +-
elf/tst-tlsmod6.c | 4 +-
sysdeps/powerpc/mod-tlsopt-powerpc.c | 6 +--
sysdeps/powerpc/tst-tlsifunc.c | 4 +-
13 files changed, 62 insertions(+), 199 deletions(-)
diff --git a/elf/Makefile b/elf/Makefile
index df68a88b37..eeb5c75eb6 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -265,7 +265,6 @@ tests-static-internal := \
tst-stackguard1-static \
tst-tls1-static \
tst-tls1-static-non-pie \
- tst-tls2-static \
# tests-static-internal
CRT-tst-tls1-static-non-pie := $(csu-objpfx)crt1.o
@@ -297,7 +296,6 @@ tests := \
tests-internal := \
$(tests-static-internal) \
tst-tls1 \
- tst-tls2 \
# tests-internal
tests-static := $(tests-static-normal) $(tests-static-internal)
diff --git a/elf/tls-macros.h b/elf/tls-macros.h
deleted file mode 100644
index e25e33b0f0..0000000000
--- a/elf/tls-macros.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/* Macros to support TLS testing in times of missing compiler support. */
-
-#define COMMON_INT_DEF(x) \
- asm (".tls_common " #x ",4,4")
-/* XXX Until we get compiler support we don't need declarations. */
-#define COMMON_INT_DECL(x)
-
-/* XXX This definition will probably be machine specific, too. */
-#define VAR_INT_DEF(x) \
- asm (".section .tdata\n\t" \
- ".globl " #x "\n" \
- ".balign 4\n" \
- #x ":\t.long 0\n\t" \
- ".size " #x ",4\n\t" \
- ".previous")
-/* XXX Until we get compiler support we don't need declarations. */
-#define VAR_INT_DECL(x)
-
-#include_next <tls-macros.h>
-
- /* XXX Each architecture must have its own asm for now. */
-#if !defined TLS_LE || !defined TLS_IE \
- || !defined TLS_LD || !defined TLS_GD
-# error "No support for this architecture so far."
-#endif
diff --git a/elf/tst-tls1.c b/elf/tst-tls1.c
index c31da56ce9..b3412213ee 100644
--- a/elf/tst-tls1.c
+++ b/elf/tst-tls1.c
@@ -1,13 +1,14 @@
/* glibc test for TLS in ld.so. */
#include <stdio.h>
-#include "tls-macros.h"
-
-
-/* Two common 'int' variables in TLS. */
-COMMON_INT_DEF(foo);
-COMMON_INT_DEF(bar);
+__thread int foo, bar __attribute__ ((tls_model("local-exec")));
+extern __thread int foo_gd asm ("foo") __attribute__ ((tls_model("global-dynamic")));
+extern __thread int foo_ld asm ("foo") __attribute__ ((tls_model("local-dynamic")));
+extern __thread int foo_ie asm ("foo") __attribute__ ((tls_model("initial-exec")));
+extern __thread int bar_gd asm ("bar") __attribute__ ((tls_model("global-dynamic")));
+extern __thread int bar_ld asm ("bar") __attribute__ ((tls_model("local-dynamic")));
+extern __thread int bar_ie asm ("bar") __attribute__ ((tls_model("initial-exec")));
static int
do_test (void)
@@ -18,63 +19,48 @@ do_test (void)
/* Set the variable using the local exec model. */
puts ("set bar to 1 (LE)");
- ap = TLS_LE (bar);
- *ap = 1;
+ bar = 1;
/* Get variables using initial exec model. */
fputs ("get sum of foo and bar (IE)", stdout);
- ap = TLS_IE (foo);
- bp = TLS_IE (bar);
+ ap = &foo_ie;
+ bp = &bar_ie;
printf (" = %d\n", *ap + *bp);
result |= *ap + *bp != 1;
- if (*ap != 0)
- {
- printf ("foo = %d\n", *ap);
- result = 1;
- }
- if (*bp != 1)
+ if (*ap != 0 || *bp != 1)
{
- printf ("bar = %d\n", *bp);
+ printf ("foo = %d\nbar = %d\n", *ap, *bp);
result = 1;
}
- /* Get variables using local dynamic model. */
- fputs ("get sum of foo and bar (LD)", stdout);
- ap = TLS_LD (foo);
- bp = TLS_LD (bar);
+ /* Get variables using local dynamic model or TLSDESC. */
+ fputs ("get sum of foo and bar (LD or TLSDESC)", stdout);
+ ap = &foo_ld;
+ bp = &bar_ld;
printf (" = %d\n", *ap + *bp);
result |= *ap + *bp != 1;
- if (*ap != 0)
- {
- printf ("foo = %d\n", *ap);
- result = 1;
- }
- if (*bp != 1)
+ if (*ap != 0 || *bp != 1)
{
- printf ("bar = %d\n", *bp);
+ printf ("foo = %d\nbar = %d\n", *ap, *bp);
result = 1;
}
- /* Get variables using generic dynamic model. */
- fputs ("get sum of foo and bar (GD)", stdout);
- ap = TLS_GD (foo);
- bp = TLS_GD (bar);
+ /* Get variables using general dynamic model or TLSDESC. */
+ fputs ("get sum of foo and bar (GD or TLSDESC)", stdout);
+ ap = &foo_gd;
+ bp = &bar_gd;
printf (" = %d\n", *ap + *bp);
result |= *ap + *bp != 1;
- if (*ap != 0)
- {
- printf ("foo = %d\n", *ap);
- result = 1;
- }
- if (*bp != 1)
+ if (*ap != 0 || *bp != 1)
{
- printf ("bar = %d\n", *bp);
+ printf ("foo = %d\nbar = %d\n", *ap, *bp);
result = 1;
}
+
return result;
}
diff --git a/elf/tst-tls2.c b/elf/tst-tls2.c
deleted file mode 100644
index 963b8d6c88..0000000000
--- a/elf/tst-tls2.c
+++ /dev/null
@@ -1,82 +0,0 @@
-/* glibc test for TLS in ld.so. */
-#include <stdio.h>
-
-#include "tls-macros.h"
-
-
-/* Two 'int' variables in TLS. */
-VAR_INT_DEF(foo);
-VAR_INT_DEF(bar);
-
-
-static int
-do_test (void)
-{
- int result = 0;
- int *ap, *bp;
-
-
- /* Set the variable using the local exec model. */
- puts ("set bar to 1 (LE)");
- ap = TLS_LE (bar);
- *ap = 1;
-
-
- /* Get variables using initial exec model. */
- fputs ("get sum of foo and bar (IE)", stdout);
- ap = TLS_IE (foo);
- bp = TLS_IE (bar);
- printf (" = %d\n", *ap + *bp);
- result |= *ap + *bp != 1;
- if (*ap != 0)
- {
- printf ("foo = %d\n", *ap);
- result = 1;
- }
- if (*bp != 1)
- {
- printf ("bar = %d\n", *bp);
- result = 1;
- }
-
-
- /* Get variables using local dynamic model. */
- fputs ("get sum of foo and bar (LD)", stdout);
- ap = TLS_LD (foo);
- bp = TLS_LD (bar);
- printf (" = %d\n", *ap + *bp);
- result |= *ap + *bp != 1;
- if (*ap != 0)
- {
- printf ("foo = %d\n", *ap);
- result = 1;
- }
- if (*bp != 1)
- {
- printf ("bar = %d\n", *bp);
- result = 1;
- }
-
-
- /* Get variables using generic dynamic model. */
- fputs ("get sum of foo and bar (GD)", stdout);
- ap = TLS_GD (foo);
- bp = TLS_GD (bar);
- printf (" = %d\n", *ap + *bp);
- result |= *ap + *bp != 1;
- if (*ap != 0)
- {
- printf ("foo = %d\n", *ap);
- result = 1;
- }
- if (*bp != 1)
- {
- printf ("bar = %d\n", *bp);
- result = 1;
- }
-
- return result;
-}
-
-
-#include <support/test-driver.c>
diff --git a/elf/tst-tls3.c b/elf/tst-tls3.c
index 7e0abb4c58..222b179626 100644
--- a/elf/tst-tls3.c
+++ b/elf/tst-tls3.c
@@ -1,13 +1,12 @@
/* glibc test for TLS in ld.so. */
#include <stdio.h>
-#include "tls-macros.h"
-
-/* One define int variable, two externs. */
-COMMON_INT_DECL(foo);
-VAR_INT_DECL(bar);
-VAR_INT_DEF(baz);
+__thread int foo, bar __attribute__ ((tls_model("initial-exec")));
+__thread int baz __attribute__ ((tls_model("local-exec")));
+extern __thread int foo_gd __attribute__ ((alias("foo"), tls_model("global-dynamic")));
+extern __thread int bar_gd __attribute__ ((alias("bar"), tls_model("global-dynamic")));
+extern __thread int baz_ld __attribute__ ((alias("baz"), tls_model("local-dynamic")));
extern int in_dso (void);
@@ -22,23 +21,20 @@ do_test (void)
/* Set the variable using the local exec model. */
puts ("set baz to 3 (LE)");
- ap = TLS_LE (baz);
- *ap = 3;
+ baz = 3;
/* Get variables using initial exec model. */
puts ("set variables foo and bar (IE)");
- ap = TLS_IE (foo);
- *ap = 1;
- bp = TLS_IE (bar);
- *bp = 2;
+ foo = 1;
+ bar = 2;
/* Get variables using local dynamic model. */
fputs ("get sum of foo, bar (GD) and baz (LD)", stdout);
- ap = TLS_GD (foo);
- bp = TLS_GD (bar);
- cp = TLS_LD (baz);
+ ap = &foo_gd;
+ bp = &bar_gd;
+ cp = &baz_ld;
printf (" = %d\n", *ap + *bp + *cp);
result |= *ap + *bp + *cp != 6;
if (*ap != 1)
diff --git a/elf/tst-tlsmod1.c b/elf/tst-tlsmod1.c
index 8d9156791b..a448c4dc37 100644
--- a/elf/tst-tlsmod1.c
+++ b/elf/tst-tlsmod1.c
@@ -1,12 +1,12 @@
#include <stdio.h>
-#include "tls-macros.h"
+__thread int foo, bar __attribute__ ((tls_model("global-dynamic")));
+extern __thread int baz __attribute__ ((tls_model("global-dynamic")));
+extern __thread int foo_ie asm ("foo") __attribute__ ((tls_model("initial-exec")));
+extern __thread int bar_ie asm ("bar") __attribute__ ((tls_model("initial-exec")));
+extern __thread int baz_ie asm ("baz") __attribute__ ((tls_model("initial-exec")));
-/* One define int variable, two externs. */
-COMMON_INT_DEF(foo);
-VAR_INT_DEF(bar);
-VAR_INT_DECL(baz);
extern int in_dso (void);
@@ -19,8 +19,8 @@ in_dso (void)
/* Get variables using initial exec model. */
fputs ("get sum of foo and bar (IE)", stdout);
asm ("" ::: "memory");
- ap = TLS_IE (foo);
- bp = TLS_IE (bar);
+ ap = &foo_ie;
+ bp = &bar_ie;
printf (" = %d\n", *ap + *bp);
result |= *ap + *bp != 3;
if (*ap != 1)
@@ -35,11 +35,11 @@ in_dso (void)
}
- /* Get variables using generic dynamic model. */
- fputs ("get sum of foo and bar and baz (GD)", stdout);
- ap = TLS_GD (foo);
- bp = TLS_GD (bar);
- cp = TLS_GD (baz);
+ /* Get variables using generic dynamic model or TLSDESC. */
+ fputs ("get sum of foo and bar and baz (GD or TLSDESC)", stdout);
+ ap = &foo;
+ bp = &bar;
+ cp = &baz;
printf (" = %d\n", *ap + *bp + *cp);
result |= *ap + *bp + *cp != 6;
if (*ap != 1)
diff --git a/elf/tst-tlsmod2.c b/elf/tst-tlsmod2.c
index 40eb1407f8..3223fe494b 100644
--- a/elf/tst-tlsmod2.c
+++ b/elf/tst-tlsmod2.c
@@ -1,9 +1,7 @@
#include <stdio.h>
-#include "tls-macros.h"
-
-COMMON_INT_DEF(foo);
+__thread int foo;
int
@@ -15,7 +13,7 @@ in_dso (int n, int *caller_foop)
puts ("foo"); /* Make sure PLT is used before macros. */
asm ("" ::: "memory");
- foop = TLS_GD (foo);
+ foop = &foo;
if (caller_foop != NULL && foop != caller_foop)
{
diff --git a/elf/tst-tlsmod3.c b/elf/tst-tlsmod3.c
index 6d186c47ee..d6e7498fd8 100644
--- a/elf/tst-tlsmod3.c
+++ b/elf/tst-tlsmod3.c
@@ -1,10 +1,10 @@
#include <stdio.h>
-#include "tls-macros.h"
extern int in_dso (int n, int *caller_foop);
-COMMON_INT_DEF(comm_n);
+extern __thread int foo;
+__thread int comm_n;
@@ -20,8 +20,8 @@ in_dso2 (void)
puts ("foo"); /* Make sure PLT is used before macros. */
asm ("" ::: "memory");
- foop = TLS_GD (foo);
- np = TLS_GD (comm_n);
+ foop = &foo;
+ np = &comm_n;
if (n != *np)
{
diff --git a/elf/tst-tlsmod4.c b/elf/tst-tlsmod4.c
index 86889aac7e..f38919a8a9 100644
--- a/elf/tst-tlsmod4.c
+++ b/elf/tst-tlsmod4.c
@@ -1,9 +1,7 @@
#include <stdio.h>
-#include "tls-macros.h"
-
-COMMON_INT_DEF(baz);
+__thread int baz;
int
@@ -15,7 +13,7 @@ in_dso (int n, int *caller_bazp)
puts ("foo"); /* Make sure PLT is used before macros. */
asm ("" ::: "memory");
- bazp = TLS_GD (baz);
+ bazp = &baz;
if (caller_bazp != NULL && bazp != caller_bazp)
{
diff --git a/elf/tst-tlsmod5.c b/elf/tst-tlsmod5.c
index a97c7e5e0c..3f39c5bdb7 100644
--- a/elf/tst-tlsmod5.c
+++ b/elf/tst-tlsmod5.c
@@ -1,3 +1 @@
-#include "tls-macros.h"
-
-COMMON_INT_DEF(foo);
+__thread int foo;
diff --git a/elf/tst-tlsmod6.c b/elf/tst-tlsmod6.c
index e968596dd4..7b3571f428 100644
--- a/elf/tst-tlsmod6.c
+++ b/elf/tst-tlsmod6.c
@@ -1,3 +1 @@
-#include "tls-macros.h"
-
-COMMON_INT_DEF(bar);
+__thread int bar;
diff --git a/sysdeps/powerpc/mod-tlsopt-powerpc.c b/sysdeps/powerpc/mod-tlsopt-powerpc.c
index 51cc502f28..d941024963 100644
--- a/sysdeps/powerpc/mod-tlsopt-powerpc.c
+++ b/sysdeps/powerpc/mod-tlsopt-powerpc.c
@@ -1,11 +1,9 @@
/* shared library to test for __tls_get_addr optimization. */
#include <stdio.h>
-#include "../../elf/tls-macros.h"
#include "dl-tls.h"
-/* common 'int' variable in TLS. */
-COMMON_INT_DEF(foo);
+__thread int foo __attribute__ ((tls_model("global-dynamic")));
int
@@ -14,7 +12,7 @@ tls_get_addr_opt_test (void)
int result = 0;
/* Get variable using general dynamic model. */
- int *ap = TLS_GD (foo);
+ int *ap = &foo;
if (*ap != 0)
{
printf ("foo = %d\n", *ap);
diff --git a/sysdeps/powerpc/tst-tlsifunc.c b/sysdeps/powerpc/tst-tlsifunc.c
index 3095d41a68..c8c0bada45 100644
--- a/sysdeps/powerpc/tst-tlsifunc.c
+++ b/sysdeps/powerpc/tst-tlsifunc.c
@@ -21,9 +21,9 @@
#include <stdint.h>
#include <inttypes.h>
#include <libc-symbols.h>
-#include <tls-macros.h>
__thread int bar;
+extern __thread int bar_gd asm ("bar") __attribute__ ((tls_model("global-dynamic")));
static int *bar_ptr = NULL;
static uint32_t resolver_platform = 0;
@@ -57,7 +57,7 @@ get_platform (void)
void
init_foo (void)
{
- bar_ptr = TLS_GD (bar);
+ bar_ptr = &bar_gd;
}
int
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-01-10 19:37 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-01-10 19:37 [glibc/release/2.34/master] elf: Drop elf/tls-macros.h in favor of __thread and tls_model attributes [BZ #28152] [BZ #28205] Florian Weimer
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).