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glibc/SOURCES/glibc-upstream-2.39-12.patch

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commit a364304718725a31ab141936322855c76c73e35e
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Feb 26 06:37:03 2024 -0800
x86: Update _dl_tlsdesc_dynamic to preserve caller-saved registers
Compiler generates the following instruction sequence for GNU2 dynamic
TLS access:
leaq tls_var@TLSDESC(%rip), %rax
call *tls_var@TLSCALL(%rax)
or
leal tls_var@TLSDESC(%ebx), %eax
call *tls_var@TLSCALL(%eax)
CALL instruction is transparent to compiler which assumes all registers,
except for EFLAGS and RAX/EAX, are unchanged after CALL. When
_dl_tlsdesc_dynamic is called, it calls __tls_get_addr on the slow
path. __tls_get_addr is a normal function which doesn't preserve any
caller-saved registers. _dl_tlsdesc_dynamic saved and restored integer
caller-saved registers, but didn't preserve any other caller-saved
registers. Add _dl_tlsdesc_dynamic IFUNC functions for FNSAVE, FXSAVE,
XSAVE and XSAVEC to save and restore all caller-saved registers. This
fixes BZ #31372.
Add GLRO(dl_x86_64_runtime_resolve) with GLRO(dl_x86_tlsdesc_dynamic)
to optimize elf_machine_runtime_setup.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 0aac205a814a8511e98d02b91a8dc908f1c53cde)
diff --git a/elf/Makefile b/elf/Makefile
index 5d78b659ce813ff9..c5c37a9147e69d83 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -424,6 +424,7 @@ tests += \
tst-glibc-hwcaps-prepend \
tst-global1 \
tst-global2 \
+ tst-gnu2-tls2 \
tst-initfinilazyfail \
tst-initorder \
tst-initorder2 \
@@ -846,6 +847,9 @@ modules-names += \
tst-filterobj-flt \
tst-finilazyfailmod \
tst-globalmod2 \
+ tst-gnu2-tls2mod0 \
+ tst-gnu2-tls2mod1 \
+ tst-gnu2-tls2mod2 \
tst-initlazyfailmod \
tst-initorder2a \
tst-initorder2b \
@@ -3044,8 +3048,22 @@ $(objpfx)tst-tlsgap.out: \
$(objpfx)tst-tlsgap-mod0.so \
$(objpfx)tst-tlsgap-mod1.so \
$(objpfx)tst-tlsgap-mod2.so
+
+$(objpfx)tst-gnu2-tls2: $(shared-thread-library)
+$(objpfx)tst-gnu2-tls2.out: \
+ $(objpfx)tst-gnu2-tls2mod0.so \
+ $(objpfx)tst-gnu2-tls2mod1.so \
+ $(objpfx)tst-gnu2-tls2mod2.so
+
ifeq (yes,$(have-mtls-dialect-gnu2))
+# This test fails if dl_tlsdesc_dynamic doesn't preserve all caller-saved
+# registers. See https://sourceware.org/bugzilla/show_bug.cgi?id=31372
+test-xfail-tst-gnu2-tls2 = yes
+
CFLAGS-tst-tlsgap-mod0.c += -mtls-dialect=gnu2
CFLAGS-tst-tlsgap-mod1.c += -mtls-dialect=gnu2
CFLAGS-tst-tlsgap-mod2.c += -mtls-dialect=gnu2
+CFLAGS-tst-gnu2-tls2mod0.c += -mtls-dialect=gnu2
+CFLAGS-tst-gnu2-tls2mod1.c += -mtls-dialect=gnu2
+CFLAGS-tst-gnu2-tls2mod2.c += -mtls-dialect=gnu2
endif
diff --git a/elf/tst-gnu2-tls2.c b/elf/tst-gnu2-tls2.c
new file mode 100644
index 0000000000000000..7ac04d7f3312033e
--- /dev/null
+++ b/elf/tst-gnu2-tls2.c
@@ -0,0 +1,122 @@
+/* Test TLSDESC relocation.
+ Copyright (C) 2024 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dlfcn.h>
+#include <pthread.h>
+#include <support/xdlfcn.h>
+#include <support/xthread.h>
+#include <support/check.h>
+#include <support/test-driver.h>
+#include "tst-gnu2-tls2.h"
+
+#ifndef IS_SUPPORTED
+# define IS_SUPPORTED() true
+#endif
+
+/* An architecture can define it to clobber caller-saved registers in
+ malloc below to verify that the implicit TLSDESC call won't change
+ caller-saved registers. */
+#ifndef PREPARE_MALLOC
+# define PREPARE_MALLOC()
+#endif
+
+extern void * __libc_malloc (size_t);
+
+size_t malloc_counter = 0;
+
+void *
+malloc (size_t n)
+{
+ PREPARE_MALLOC ();
+ malloc_counter++;
+ return __libc_malloc (n);
+}
+
+static void *mod[3];
+#ifndef MOD
+# define MOD(i) "tst-gnu2-tls2mod" #i ".so"
+#endif
+static const char *modname[3] = { MOD(0), MOD(1), MOD(2) };
+#undef MOD
+
+static void
+open_mod (int i)
+{
+ mod[i] = xdlopen (modname[i], RTLD_LAZY);
+ printf ("open %s\n", modname[i]);
+}
+
+static void
+close_mod (int i)
+{
+ xdlclose (mod[i]);
+ mod[i] = NULL;
+ printf ("close %s\n", modname[i]);
+}
+
+static void
+access_mod (int i, const char *sym)
+{
+ struct tls var = { -1, -1, -1, -1 };
+ struct tls *(*f) (struct tls *) = xdlsym (mod[i], sym);
+ /* Check that our malloc is called. */
+ malloc_counter = 0;
+ struct tls *p = f (&var);
+ TEST_VERIFY (malloc_counter != 0);
+ printf ("access %s: %s() = %p\n", modname[i], sym, p);
+ TEST_VERIFY_EXIT (memcmp (p, &var, sizeof (var)) == 0);
+ ++(p->a);
+}
+
+static void *
+start (void *arg)
+{
+ /* The DTV generation is at the last dlopen of mod0 and the
+ entry for mod1 is NULL. */
+
+ open_mod (1); /* Reuse modid of mod1. Uses dynamic TLS. */
+
+ /* Force the slow path in GNU2 TLS descriptor call. */
+ access_mod (1, "apply_tls");
+
+ return arg;
+}
+
+static int
+do_test (void)
+{
+ if (!IS_SUPPORTED ())
+ return EXIT_UNSUPPORTED;
+
+ open_mod (0);
+ open_mod (1);
+ open_mod (2);
+ close_mod (0);
+ close_mod (1); /* Create modid gap at mod1. */
+ open_mod (0); /* Reuse modid of mod0, bump generation count. */
+
+ /* Create a thread where DTV of mod1 is NULL. */
+ pthread_t t = xpthread_create (NULL, start, NULL);
+ xpthread_join (t);
+ return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/elf/tst-gnu2-tls2.h b/elf/tst-gnu2-tls2.h
new file mode 100644
index 0000000000000000..77964a57a352e6a4
--- /dev/null
+++ b/elf/tst-gnu2-tls2.h
@@ -0,0 +1,36 @@
+/* Test TLSDESC relocation.
+ Copyright (C) 2024 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/>. */
+
+#include <stdint.h>
+
+struct tls
+{
+ int64_t a, b, c, d;
+};
+
+extern struct tls *apply_tls (struct tls *);
+
+/* An architecture can define them to verify that clobber caller-saved
+ registers aren't changed by the implicit TLSDESC call. */
+#ifndef BEFORE_TLSDESC_CALL
+# define BEFORE_TLSDESC_CALL()
+#endif
+
+#ifndef AFTER_TLSDESC_CALL
+# define AFTER_TLSDESC_CALL()
+#endif
diff --git a/elf/tst-gnu2-tls2mod0.c b/elf/tst-gnu2-tls2mod0.c
new file mode 100644
index 0000000000000000..45556a0e173922cc
--- /dev/null
+++ b/elf/tst-gnu2-tls2mod0.c
@@ -0,0 +1,31 @@
+/* DSO used by tst-gnu2-tls2.
+ Copyright (C) 2024 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/>. */
+
+#include "tst-gnu2-tls2.h"
+
+__thread struct tls tls_var0 __attribute__ ((visibility ("hidden")));
+
+struct tls *
+apply_tls (struct tls *p)
+{
+ BEFORE_TLSDESC_CALL ();
+ tls_var0 = *p;
+ struct tls *ret = &tls_var0;
+ AFTER_TLSDESC_CALL ();
+ return ret;
+}
diff --git a/elf/tst-gnu2-tls2mod1.c b/elf/tst-gnu2-tls2mod1.c
new file mode 100644
index 0000000000000000..e10b9dbc0a7573c7
--- /dev/null
+++ b/elf/tst-gnu2-tls2mod1.c
@@ -0,0 +1,31 @@
+/* DSO used by tst-gnu2-tls2.
+ Copyright (C) 2024 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/>. */
+
+#include "tst-gnu2-tls2.h"
+
+__thread struct tls tls_var1[100] __attribute__ ((visibility ("hidden")));
+
+struct tls *
+apply_tls (struct tls *p)
+{
+ BEFORE_TLSDESC_CALL ();
+ tls_var1[1] = *p;
+ struct tls *ret = &tls_var1[1];
+ AFTER_TLSDESC_CALL ();
+ return ret;
+}
diff --git a/elf/tst-gnu2-tls2mod2.c b/elf/tst-gnu2-tls2mod2.c
new file mode 100644
index 0000000000000000..141af51e55b8bf34
--- /dev/null
+++ b/elf/tst-gnu2-tls2mod2.c
@@ -0,0 +1,31 @@
+/* DSO used by tst-gnu2-tls2.
+ Copyright (C) 2024 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/>. */
+
+#include "tst-gnu2-tls2.h"
+
+__thread struct tls tls_var2 __attribute__ ((visibility ("hidden")));
+
+struct tls *
+apply_tls (struct tls *p)
+{
+ BEFORE_TLSDESC_CALL ();
+ tls_var2 = *p;
+ struct tls *ret = &tls_var2;
+ AFTER_TLSDESC_CALL ();
+ return ret;
+}
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h
index fc1ef96587e1992e..50d74fe6e9aaa7bb 100644
--- a/sysdeps/i386/dl-machine.h
+++ b/sysdeps/i386/dl-machine.h
@@ -347,7 +347,7 @@ and creates an unsatisfiable circular dependency.\n",
{
td->arg = _dl_make_tlsdesc_dynamic
(sym_map, sym->st_value + (ElfW(Word))td->arg);
- td->entry = _dl_tlsdesc_dynamic;
+ td->entry = GLRO(dl_x86_tlsdesc_dynamic);
}
else
# endif
diff --git a/sysdeps/i386/dl-tlsdesc-dynamic.h b/sysdeps/i386/dl-tlsdesc-dynamic.h
new file mode 100644
index 0000000000000000..36270285775016ff
--- /dev/null
+++ b/sysdeps/i386/dl-tlsdesc-dynamic.h
@@ -0,0 +1,190 @@
+/* Thread-local storage handling in the ELF dynamic linker. i386 version.
+ Copyright (C) 2004-2024 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/>. */
+
+#undef REGISTER_SAVE_AREA
+
+#if !defined USE_FNSAVE && (STATE_SAVE_ALIGNMENT % 16) != 0
+# error STATE_SAVE_ALIGNMENT must be multiple of 16
+#endif
+
+#if DL_RUNTIME_RESOLVE_REALIGN_STACK
+# ifdef USE_FNSAVE
+# error USE_FNSAVE shouldn't be defined
+# endif
+# ifdef USE_FXSAVE
+/* Use fxsave to save all registers. */
+# define REGISTER_SAVE_AREA 512
+# endif
+#else
+# ifdef USE_FNSAVE
+/* Use fnsave to save x87 FPU stack registers. */
+# define REGISTER_SAVE_AREA 108
+# else
+# ifndef USE_FXSAVE
+# error USE_FXSAVE must be defined
+# endif
+/* Use fxsave to save all registers. Add 12 bytes to align the stack
+ to 16 bytes. */
+# define REGISTER_SAVE_AREA (512 + 12)
+# endif
+#endif
+
+ .hidden _dl_tlsdesc_dynamic
+ .global _dl_tlsdesc_dynamic
+ .type _dl_tlsdesc_dynamic,@function
+
+ /* This function is used for symbols that need dynamic TLS.
+
+ %eax points to the TLS descriptor, such that 0(%eax) points to
+ _dl_tlsdesc_dynamic itself, and 4(%eax) points to a struct
+ tlsdesc_dynamic_arg object. It must return in %eax the offset
+ between the thread pointer and the object denoted by the
+ argument, without clobbering any registers.
+
+ The assembly code that follows is a rendition of the following
+ C code, hand-optimized a little bit.
+
+ptrdiff_t
+__attribute__ ((__regparm__ (1)))
+_dl_tlsdesc_dynamic (struct tlsdesc *tdp)
+{
+ struct tlsdesc_dynamic_arg *td = tdp->arg;
+ dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + DTV_OFFSET);
+ if (__builtin_expect (td->gen_count <= dtv[0].counter
+ && (dtv[td->tlsinfo.ti_module].pointer.val
+ != TLS_DTV_UNALLOCATED),
+ 1))
+ return dtv[td->tlsinfo.ti_module].pointer.val + td->tlsinfo.ti_offset
+ - __thread_pointer;
+
+ return ___tls_get_addr (&td->tlsinfo) - __thread_pointer;
+}
+*/
+ cfi_startproc
+ .align 16
+_dl_tlsdesc_dynamic:
+ /* Like all TLS resolvers, preserve call-clobbered registers.
+ We need two scratch regs anyway. */
+ subl $32, %esp
+ cfi_adjust_cfa_offset (32)
+ movl %ecx, 20(%esp)
+ movl %edx, 24(%esp)
+ movl TLSDESC_ARG(%eax), %eax
+ movl %gs:DTV_OFFSET, %edx
+ movl TLSDESC_GEN_COUNT(%eax), %ecx
+ cmpl (%edx), %ecx
+ ja 2f
+ movl TLSDESC_MODID(%eax), %ecx
+ movl (%edx,%ecx,8), %edx
+ cmpl $-1, %edx
+ je 2f
+ movl TLSDESC_MODOFF(%eax), %eax
+ addl %edx, %eax
+1:
+ movl 20(%esp), %ecx
+ subl %gs:0, %eax
+ movl 24(%esp), %edx
+ addl $32, %esp
+ cfi_adjust_cfa_offset (-32)
+ ret
+ .p2align 4,,7
+2:
+ cfi_adjust_cfa_offset (32)
+#if DL_RUNTIME_RESOLVE_REALIGN_STACK
+ movl %ebx, -28(%esp)
+ movl %esp, %ebx
+ cfi_def_cfa_register(%ebx)
+ and $-STATE_SAVE_ALIGNMENT, %esp
+#endif
+#ifdef REGISTER_SAVE_AREA
+ subl $REGISTER_SAVE_AREA, %esp
+# if !DL_RUNTIME_RESOLVE_REALIGN_STACK
+ cfi_adjust_cfa_offset(REGISTER_SAVE_AREA)
+# endif
+#else
+# if !DL_RUNTIME_RESOLVE_REALIGN_STACK
+# error DL_RUNTIME_RESOLVE_REALIGN_STACK must be true
+# endif
+ /* Allocate stack space of the required size to save the state. */
+ LOAD_PIC_REG (cx)
+ subl RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+XSAVE_STATE_SIZE_OFFSET+_rtld_local_ro@GOTOFF(%ecx), %esp
+#endif
+#ifdef USE_FNSAVE
+ fnsave (%esp)
+#elif defined USE_FXSAVE
+ fxsave (%esp)
+#else
+ /* Save the argument for ___tls_get_addr in EAX. */
+ movl %eax, %ecx
+ movl $TLSDESC_CALL_STATE_SAVE_MASK, %eax
+ xorl %edx, %edx
+ /* Clear the XSAVE Header. */
+# ifdef USE_XSAVE
+ movl %edx, (512)(%esp)
+ movl %edx, (512 + 4 * 1)(%esp)
+ movl %edx, (512 + 4 * 2)(%esp)
+ movl %edx, (512 + 4 * 3)(%esp)
+# endif
+ movl %edx, (512 + 4 * 4)(%esp)
+ movl %edx, (512 + 4 * 5)(%esp)
+ movl %edx, (512 + 4 * 6)(%esp)
+ movl %edx, (512 + 4 * 7)(%esp)
+ movl %edx, (512 + 4 * 8)(%esp)
+ movl %edx, (512 + 4 * 9)(%esp)
+ movl %edx, (512 + 4 * 10)(%esp)
+ movl %edx, (512 + 4 * 11)(%esp)
+ movl %edx, (512 + 4 * 12)(%esp)
+ movl %edx, (512 + 4 * 13)(%esp)
+ movl %edx, (512 + 4 * 14)(%esp)
+ movl %edx, (512 + 4 * 15)(%esp)
+# ifdef USE_XSAVE
+ xsave (%esp)
+# else
+ xsavec (%esp)
+# endif
+ /* Restore the argument for ___tls_get_addr in EAX. */
+ movl %ecx, %eax
+#endif
+ call HIDDEN_JUMPTARGET (___tls_get_addr)
+ /* Get register content back. */
+#ifdef USE_FNSAVE
+ frstor (%esp)
+#elif defined USE_FXSAVE
+ fxrstor (%esp)
+#else
+ /* Save and retore ___tls_get_addr return value stored in EAX. */
+ movl %eax, %ecx
+ movl $TLSDESC_CALL_STATE_SAVE_MASK, %eax
+ xorl %edx, %edx
+ xrstor (%esp)
+ movl %ecx, %eax
+#endif
+#if DL_RUNTIME_RESOLVE_REALIGN_STACK
+ mov %ebx, %esp
+ cfi_def_cfa_register(%esp)
+ movl -28(%esp), %ebx
+ cfi_restore(%ebx)
+#else
+ addl $REGISTER_SAVE_AREA, %esp
+ cfi_adjust_cfa_offset(-REGISTER_SAVE_AREA)
+#endif
+ jmp 1b
+ cfi_endproc
+ .size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
+
+#undef STATE_SAVE_ALIGNMENT
diff --git a/sysdeps/i386/dl-tlsdesc.S b/sysdeps/i386/dl-tlsdesc.S
index 90d93caa0cdb7442..f002feee56e43f71 100644
--- a/sysdeps/i386/dl-tlsdesc.S
+++ b/sysdeps/i386/dl-tlsdesc.S
@@ -18,8 +18,27 @@
#include <sysdep.h>
#include <tls.h>
+#include <cpu-features-offsets.h>
+#include <features-offsets.h>
#include "tlsdesc.h"
+#ifndef DL_STACK_ALIGNMENT
+/* Due to GCC bug:
+
+ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
+
+ __tls_get_addr may be called with 4-byte stack alignment. Although
+ this bug has been fixed in GCC 4.9.4, 5.3 and 6, we can't assume
+ that stack will be always aligned at 16 bytes. */
+# define DL_STACK_ALIGNMENT 4
+#endif
+
+/* True if _dl_tlsdesc_dynamic should align stack for STATE_SAVE or align
+ stack to MINIMUM_ALIGNMENT bytes before calling ___tls_get_addr. */
+#define DL_RUNTIME_RESOLVE_REALIGN_STACK \
+ (STATE_SAVE_ALIGNMENT > DL_STACK_ALIGNMENT \
+ || MINIMUM_ALIGNMENT > DL_STACK_ALIGNMENT)
+
.text
/* This function is used to compute the TP offset for symbols in
@@ -65,69 +84,35 @@ _dl_tlsdesc_undefweak:
.size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
#ifdef SHARED
- .hidden _dl_tlsdesc_dynamic
- .global _dl_tlsdesc_dynamic
- .type _dl_tlsdesc_dynamic,@function
-
- /* This function is used for symbols that need dynamic TLS.
-
- %eax points to the TLS descriptor, such that 0(%eax) points to
- _dl_tlsdesc_dynamic itself, and 4(%eax) points to a struct
- tlsdesc_dynamic_arg object. It must return in %eax the offset
- between the thread pointer and the object denoted by the
- argument, without clobbering any registers.
-
- The assembly code that follows is a rendition of the following
- C code, hand-optimized a little bit.
-
-ptrdiff_t
-__attribute__ ((__regparm__ (1)))
-_dl_tlsdesc_dynamic (struct tlsdesc *tdp)
-{
- struct tlsdesc_dynamic_arg *td = tdp->arg;
- dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + DTV_OFFSET);
- if (__builtin_expect (td->gen_count <= dtv[0].counter
- && (dtv[td->tlsinfo.ti_module].pointer.val
- != TLS_DTV_UNALLOCATED),
- 1))
- return dtv[td->tlsinfo.ti_module].pointer.val + td->tlsinfo.ti_offset
- - __thread_pointer;
-
- return ___tls_get_addr (&td->tlsinfo) - __thread_pointer;
-}
-*/
- cfi_startproc
- .align 16
-_dl_tlsdesc_dynamic:
- /* Like all TLS resolvers, preserve call-clobbered registers.
- We need two scratch regs anyway. */
- subl $28, %esp
- cfi_adjust_cfa_offset (28)
- movl %ecx, 20(%esp)
- movl %edx, 24(%esp)
- movl TLSDESC_ARG(%eax), %eax
- movl %gs:DTV_OFFSET, %edx
- movl TLSDESC_GEN_COUNT(%eax), %ecx
- cmpl (%edx), %ecx
- ja .Lslow
- movl TLSDESC_MODID(%eax), %ecx
- movl (%edx,%ecx,8), %edx
- cmpl $-1, %edx
- je .Lslow
- movl TLSDESC_MODOFF(%eax), %eax
- addl %edx, %eax
-.Lret:
- movl 20(%esp), %ecx
- subl %gs:0, %eax
- movl 24(%esp), %edx
- addl $28, %esp
- cfi_adjust_cfa_offset (-28)
- ret
- .p2align 4,,7
-.Lslow:
- cfi_adjust_cfa_offset (28)
- call HIDDEN_JUMPTARGET (___tls_get_addr)
- jmp .Lret
- cfi_endproc
- .size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
+# define USE_FNSAVE
+# define MINIMUM_ALIGNMENT 4
+# define STATE_SAVE_ALIGNMENT 4
+# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_fnsave
+# include "dl-tlsdesc-dynamic.h"
+# undef _dl_tlsdesc_dynamic
+# undef MINIMUM_ALIGNMENT
+# undef USE_FNSAVE
+
+# define MINIMUM_ALIGNMENT 16
+
+# define USE_FXSAVE
+# define STATE_SAVE_ALIGNMENT 16
+# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_fxsave
+# include "dl-tlsdesc-dynamic.h"
+# undef _dl_tlsdesc_dynamic
+# undef USE_FXSAVE
+
+# define USE_XSAVE
+# define STATE_SAVE_ALIGNMENT 64
+# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_xsave
+# include "dl-tlsdesc-dynamic.h"
+# undef _dl_tlsdesc_dynamic
+# undef USE_XSAVE
+
+# define USE_XSAVEC
+# define STATE_SAVE_ALIGNMENT 64
+# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_xsavec
+# include "dl-tlsdesc-dynamic.h"
+# undef _dl_tlsdesc_dynamic
+# undef USE_XSAVEC
#endif /* SHARED */
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index 4d50b327b55ffd65..992aabe43ec60abf 100644
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -1,5 +1,5 @@
ifeq ($(subdir),csu)
-gen-as-const-headers += cpu-features-offsets.sym
+gen-as-const-headers += cpu-features-offsets.sym features-offsets.sym
endif
ifeq ($(subdir),elf)
@@ -86,6 +86,11 @@ endif
tst-ifunc-isa-2-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-SSE4_2,-AVX,-AVX2,-AVX512F
tst-ifunc-isa-2-static-ENV = $(tst-ifunc-isa-2-ENV)
tst-hwcap-tunables-ARGS = -- $(host-test-program-cmd)
+
+CFLAGS-tst-gnu2-tls2.c += -msse
+CFLAGS-tst-gnu2-tls2mod0.c += -msse2 -mtune=haswell
+CFLAGS-tst-gnu2-tls2mod1.c += -msse2 -mtune=haswell
+CFLAGS-tst-gnu2-tls2mod2.c += -msse2 -mtune=haswell
endif
ifeq ($(subdir),math)
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 25e6622a79bb969f..835113b42f924b83 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -27,8 +27,13 @@
extern void TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *)
attribute_hidden;
-#if defined SHARED && defined __x86_64__
-# include <dl-plt-rewrite.h>
+#if defined SHARED
+extern void _dl_tlsdesc_dynamic_fxsave (void) attribute_hidden;
+extern void _dl_tlsdesc_dynamic_xsave (void) attribute_hidden;
+extern void _dl_tlsdesc_dynamic_xsavec (void) attribute_hidden;
+
+# ifdef __x86_64__
+# include <dl-plt-rewrite.h>
static void
TUNABLE_CALLBACK (set_plt_rewrite) (tunable_val_t *valp)
@@ -47,6 +52,15 @@ TUNABLE_CALLBACK (set_plt_rewrite) (tunable_val_t *valp)
: plt_rewrite_jmp);
}
}
+# else
+extern void _dl_tlsdesc_dynamic_fnsave (void) attribute_hidden;
+# endif
+#endif
+
+#ifdef __x86_64__
+extern void _dl_runtime_resolve_fxsave (void) attribute_hidden;
+extern void _dl_runtime_resolve_xsave (void) attribute_hidden;
+extern void _dl_runtime_resolve_xsavec (void) attribute_hidden;
#endif
#ifdef __LP64__
@@ -1130,6 +1144,44 @@ no_cpuid:
TUNABLE_CALLBACK (set_x86_shstk));
#endif
+ if (GLRO(dl_x86_cpu_features).xsave_state_size != 0)
+ {
+ if (CPU_FEATURE_USABLE_P (cpu_features, XSAVEC))
+ {
+#ifdef __x86_64__
+ GLRO(dl_x86_64_runtime_resolve) = _dl_runtime_resolve_xsavec;
+#endif
+#ifdef SHARED
+ GLRO(dl_x86_tlsdesc_dynamic) = _dl_tlsdesc_dynamic_xsavec;
+#endif
+ }
+ else
+ {
+#ifdef __x86_64__
+ GLRO(dl_x86_64_runtime_resolve) = _dl_runtime_resolve_xsave;
+#endif
+#ifdef SHARED
+ GLRO(dl_x86_tlsdesc_dynamic) = _dl_tlsdesc_dynamic_xsave;
+#endif
+ }
+ }
+ else
+ {
+#ifdef __x86_64__
+ GLRO(dl_x86_64_runtime_resolve) = _dl_runtime_resolve_fxsave;
+# ifdef SHARED
+ GLRO(dl_x86_tlsdesc_dynamic) = _dl_tlsdesc_dynamic_fxsave;
+# endif
+#else
+# ifdef SHARED
+ if (CPU_FEATURE_USABLE_P (cpu_features, FXSR))
+ GLRO(dl_x86_tlsdesc_dynamic) = _dl_tlsdesc_dynamic_fxsave;
+ else
+ GLRO(dl_x86_tlsdesc_dynamic) = _dl_tlsdesc_dynamic_fnsave;
+# endif
+#endif
+ }
+
#ifdef SHARED
# ifdef __x86_64__
TUNABLE_GET (plt_rewrite, tunable_val_t *,
diff --git a/sysdeps/x86/dl-procinfo.c b/sysdeps/x86/dl-procinfo.c
index ee957b4d70050b1c..5920d4b32034501d 100644
--- a/sysdeps/x86/dl-procinfo.c
+++ b/sysdeps/x86/dl-procinfo.c
@@ -86,3 +86,19 @@ PROCINFO_CLASS const char _dl_x86_platforms[4][9]
#else
,
#endif
+
+#if defined SHARED && !IS_IN (ldconfig)
+# if !defined PROCINFO_DECL
+ ._dl_x86_tlsdesc_dynamic
+# else
+PROCINFO_CLASS void * _dl_x86_tlsdesc_dynamic
+# endif
+# ifndef PROCINFO_DECL
+= NULL
+# endif
+# ifdef PROCINFO_DECL
+;
+# else
+,
+# endif
+#endif
diff --git a/sysdeps/x86_64/features-offsets.sym b/sysdeps/x86/features-offsets.sym
similarity index 89%
rename from sysdeps/x86_64/features-offsets.sym
rename to sysdeps/x86/features-offsets.sym
index 9e4be3393a60fd92..77e990c7053a38bf 100644
--- a/sysdeps/x86_64/features-offsets.sym
+++ b/sysdeps/x86/features-offsets.sym
@@ -3,4 +3,6 @@
#include <ldsodefs.h>
RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET offsetof (struct rtld_global_ro, _dl_x86_cpu_features)
+#ifdef __x86_64__
RTLD_GLOBAL_DL_X86_FEATURE_1_OFFSET offsetof (struct rtld_global, _dl_x86_feature_1)
+#endif
diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h
index 837fd28734914a1c..485cad9c0283b334 100644
--- a/sysdeps/x86/sysdep.h
+++ b/sysdeps/x86/sysdep.h
@@ -70,6 +70,12 @@
| (1 << X86_XSTATE_ZMM_H_ID))
#endif
+/* States which should be saved for TLSDESC_CALL and TLS_DESC_CALL.
+ Compiler assumes that all registers, including x87 FPU stack registers,
+ are unchanged after CALL, except for EFLAGS and RAX/EAX. */
+#define TLSDESC_CALL_STATE_SAVE_MASK \
+ (STATE_SAVE_MASK | (1 << X86_XSTATE_X87_ID))
+
/* Constants for bits in __x86_string_control: */
/* Avoid short distance REP MOVSB. */
diff --git a/sysdeps/x86/tst-gnu2-tls2.c b/sysdeps/x86/tst-gnu2-tls2.c
new file mode 100644
index 0000000000000000..de900a423bb70321
--- /dev/null
+++ b/sysdeps/x86/tst-gnu2-tls2.c
@@ -0,0 +1,20 @@
+#ifndef __x86_64__
+#include <sys/platform/x86.h>
+
+#define IS_SUPPORTED() CPU_FEATURE_ACTIVE (SSE2)
+#endif
+
+/* Clear XMM0...XMM7 */
+#define PREPARE_MALLOC() \
+{ \
+ asm volatile ("xorps %%xmm0, %%xmm0" : : : "xmm0" ); \
+ asm volatile ("xorps %%xmm1, %%xmm1" : : : "xmm1" ); \
+ asm volatile ("xorps %%xmm2, %%xmm2" : : : "xmm2" ); \
+ asm volatile ("xorps %%xmm3, %%xmm3" : : : "xmm3" ); \
+ asm volatile ("xorps %%xmm4, %%xmm4" : : : "xmm4" ); \
+ asm volatile ("xorps %%xmm5, %%xmm5" : : : "xmm5" ); \
+ asm volatile ("xorps %%xmm6, %%xmm6" : : : "xmm6" ); \
+ asm volatile ("xorps %%xmm7, %%xmm7" : : : "xmm7" ); \
+}
+
+#include <elf/tst-gnu2-tls2.c>
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 90f4ecfd262cfb87..e8babc9a4edbf90b 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -10,7 +10,7 @@ LDFLAGS-rtld += -Wl,-z,nomark-plt
endif
ifeq ($(subdir),csu)
-gen-as-const-headers += features-offsets.sym link-defines.sym
+gen-as-const-headers += link-defines.sym
endif
ifeq ($(subdir),gmon)
diff --git a/sysdeps/x86_64/dl-machine.h b/sysdeps/x86_64/dl-machine.h
index 6d605d0d3293bcd6..ff5d45f7cb7cd81d 100644
--- a/sysdeps/x86_64/dl-machine.h
+++ b/sysdeps/x86_64/dl-machine.h
@@ -71,9 +71,6 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
int lazy, int profile)
{
Elf64_Addr *got;
- extern void _dl_runtime_resolve_fxsave (ElfW(Word)) attribute_hidden;
- extern void _dl_runtime_resolve_xsave (ElfW(Word)) attribute_hidden;
- extern void _dl_runtime_resolve_xsavec (ElfW(Word)) attribute_hidden;
extern void _dl_runtime_profile_sse (ElfW(Word)) attribute_hidden;
extern void _dl_runtime_profile_avx (ElfW(Word)) attribute_hidden;
extern void _dl_runtime_profile_avx512 (ElfW(Word)) attribute_hidden;
@@ -96,8 +93,6 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
/* Identify this shared object. */
*(ElfW(Addr) *) (got + 1) = (ElfW(Addr)) l;
- const struct cpu_features* cpu_features = __get_cpu_features ();
-
#ifdef SHARED
/* The got[2] entry contains the address of a function which gets
called to get the address of a so far unresolved function and
@@ -107,6 +102,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
end in this function. */
if (__glibc_unlikely (profile))
{
+ const struct cpu_features* cpu_features = __get_cpu_features ();
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512F))
*(ElfW(Addr) *) (got + 2) = (ElfW(Addr)) &_dl_runtime_profile_avx512;
else if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX))
@@ -126,15 +122,8 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
/* This function will get called to fix up the GOT entry
indicated by the offset on the stack, and then jump to
the resolved address. */
- if (MINIMUM_X86_ISA_LEVEL >= AVX_X86_ISA_LEVEL
- || GLRO(dl_x86_cpu_features).xsave_state_size != 0)
- *(ElfW(Addr) *) (got + 2)
- = (CPU_FEATURE_USABLE_P (cpu_features, XSAVEC)
- ? (ElfW(Addr)) &_dl_runtime_resolve_xsavec
- : (ElfW(Addr)) &_dl_runtime_resolve_xsave);
- else
- *(ElfW(Addr) *) (got + 2)
- = (ElfW(Addr)) &_dl_runtime_resolve_fxsave;
+ *(ElfW(Addr) *) (got + 2)
+ = (ElfW(Addr)) GLRO(dl_x86_64_runtime_resolve);
}
}
@@ -383,7 +372,7 @@ and creates an unsatisfiable circular dependency.\n",
{
td->arg = _dl_make_tlsdesc_dynamic
(sym_map, sym->st_value + reloc->r_addend);
- td->entry = _dl_tlsdesc_dynamic;
+ td->entry = GLRO(dl_x86_tlsdesc_dynamic);
}
else
# endif
diff --git a/sysdeps/x86_64/dl-procinfo.c b/sysdeps/x86_64/dl-procinfo.c
index 4d1d790fbb2f2992..06637a8154d8648f 100644
--- a/sysdeps/x86_64/dl-procinfo.c
+++ b/sysdeps/x86_64/dl-procinfo.c
@@ -41,5 +41,21 @@
#include <sysdeps/x86/dl-procinfo.c>
+#if !IS_IN (ldconfig)
+# if !defined PROCINFO_DECL && defined SHARED
+ ._dl_x86_64_runtime_resolve
+# else
+PROCINFO_CLASS void * _dl_x86_64_runtime_resolve
+# endif
+# ifndef PROCINFO_DECL
+= NULL
+# endif
+# if !defined SHARED || defined PROCINFO_DECL
+;
+# else
+,
+# endif
+#endif
+
#undef PROCINFO_DECL
#undef PROCINFO_CLASS
diff --git a/sysdeps/x86_64/dl-tlsdesc-dynamic.h b/sysdeps/x86_64/dl-tlsdesc-dynamic.h
new file mode 100644
index 0000000000000000..0c2e8d5320d0bd26
--- /dev/null
+++ b/sysdeps/x86_64/dl-tlsdesc-dynamic.h
@@ -0,0 +1,166 @@
+/* Thread-local storage handling in the ELF dynamic linker. x86_64 version.
+ Copyright (C) 2004-2024 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/>. */
+
+#ifndef SECTION
+# define SECTION(p) p
+#endif
+
+#undef REGISTER_SAVE_AREA
+#undef LOCAL_STORAGE_AREA
+#undef BASE
+
+#include "dl-trampoline-state.h"
+
+ .section SECTION(.text),"ax",@progbits
+
+ .hidden _dl_tlsdesc_dynamic
+ .global _dl_tlsdesc_dynamic
+ .type _dl_tlsdesc_dynamic,@function
+
+ /* %rax points to the TLS descriptor, such that 0(%rax) points to
+ _dl_tlsdesc_dynamic itself, and 8(%rax) points to a struct
+ tlsdesc_dynamic_arg object. It must return in %rax the offset
+ between the thread pointer and the object denoted by the
+ argument, without clobbering any registers.
+
+ The assembly code that follows is a rendition of the following
+ C code, hand-optimized a little bit.
+
+ptrdiff_t
+_dl_tlsdesc_dynamic (register struct tlsdesc *tdp asm ("%rax"))
+{
+ struct tlsdesc_dynamic_arg *td = tdp->arg;
+ dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + DTV_OFFSET);
+ if (__builtin_expect (td->gen_count <= dtv[0].counter
+ && (dtv[td->tlsinfo.ti_module].pointer.val
+ != TLS_DTV_UNALLOCATED),
+ 1))
+ return dtv[td->tlsinfo.ti_module].pointer.val + td->tlsinfo.ti_offset
+ - __thread_pointer;
+
+ return __tls_get_addr_internal (&td->tlsinfo) - __thread_pointer;
+}
+*/
+ cfi_startproc
+ .align 16
+_dl_tlsdesc_dynamic:
+ _CET_ENDBR
+ /* Preserve call-clobbered registers that we modify.
+ We need two scratch regs anyway. */
+ movq %rsi, -16(%rsp)
+ mov %fs:DTV_OFFSET, %RSI_LP
+ movq %rdi, -8(%rsp)
+ movq TLSDESC_ARG(%rax), %rdi
+ movq (%rsi), %rax
+ cmpq %rax, TLSDESC_GEN_COUNT(%rdi)
+ ja 2f
+ movq TLSDESC_MODID(%rdi), %rax
+ salq $4, %rax
+ movq (%rax,%rsi), %rax
+ cmpq $-1, %rax
+ je 2f
+ addq TLSDESC_MODOFF(%rdi), %rax
+1:
+ movq -16(%rsp), %rsi
+ sub %fs:0, %RAX_LP
+ movq -8(%rsp), %rdi
+ ret
+2:
+#if DL_RUNTIME_RESOLVE_REALIGN_STACK
+ movq %rbx, -24(%rsp)
+ mov %RSP_LP, %RBX_LP
+ cfi_def_cfa_register(%rbx)
+ and $-STATE_SAVE_ALIGNMENT, %RSP_LP
+#endif
+#ifdef REGISTER_SAVE_AREA
+# if DL_RUNTIME_RESOLVE_REALIGN_STACK
+ /* STATE_SAVE_OFFSET has space for 8 integer registers. But we
+ need space for RCX, RDX, RSI, RDI, R8, R9, R10 and R11, plus
+ RBX above. */
+ sub $(REGISTER_SAVE_AREA + STATE_SAVE_ALIGNMENT), %RSP_LP
+# else
+ sub $REGISTER_SAVE_AREA, %RSP_LP
+ cfi_adjust_cfa_offset(REGISTER_SAVE_AREA)
+# endif
+#else
+ /* Allocate stack space of the required size to save the state. */
+ sub _rtld_local_ro+RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+XSAVE_STATE_SIZE_OFFSET(%rip), %RSP_LP
+#endif
+ /* Besides rdi and rsi, saved above, save rcx, rdx, r8, r9,
+ r10 and r11. */
+ movq %rcx, REGISTER_SAVE_RCX(%rsp)
+ movq %rdx, REGISTER_SAVE_RDX(%rsp)
+ movq %r8, REGISTER_SAVE_R8(%rsp)
+ movq %r9, REGISTER_SAVE_R9(%rsp)
+ movq %r10, REGISTER_SAVE_R10(%rsp)
+ movq %r11, REGISTER_SAVE_R11(%rsp)
+#ifdef USE_FXSAVE
+ fxsave STATE_SAVE_OFFSET(%rsp)
+#else
+ movl $TLSDESC_CALL_STATE_SAVE_MASK, %eax
+ xorl %edx, %edx
+ /* Clear the XSAVE Header. */
+# ifdef USE_XSAVE
+ movq %rdx, (STATE_SAVE_OFFSET + 512)(%rsp)
+ movq %rdx, (STATE_SAVE_OFFSET + 512 + 8)(%rsp)
+# endif
+ movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 2)(%rsp)
+ movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 3)(%rsp)
+ movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 4)(%rsp)
+ movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 5)(%rsp)
+ movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 6)(%rsp)
+ movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 7)(%rsp)
+# ifdef USE_XSAVE
+ xsave STATE_SAVE_OFFSET(%rsp)
+# else
+ xsavec STATE_SAVE_OFFSET(%rsp)
+# endif
+#endif
+ /* %rdi already points to the tlsinfo data structure. */
+ call HIDDEN_JUMPTARGET (__tls_get_addr)
+ # Get register content back.
+#ifdef USE_FXSAVE
+ fxrstor STATE_SAVE_OFFSET(%rsp)
+#else
+ /* Save and retore __tls_get_addr return value stored in RAX. */
+ mov %RAX_LP, %RCX_LP
+ movl $TLSDESC_CALL_STATE_SAVE_MASK, %eax
+ xorl %edx, %edx
+ xrstor STATE_SAVE_OFFSET(%rsp)
+ mov %RCX_LP, %RAX_LP
+#endif
+ movq REGISTER_SAVE_R11(%rsp), %r11
+ movq REGISTER_SAVE_R10(%rsp), %r10
+ movq REGISTER_SAVE_R9(%rsp), %r9
+ movq REGISTER_SAVE_R8(%rsp), %r8
+ movq REGISTER_SAVE_RDX(%rsp), %rdx
+ movq REGISTER_SAVE_RCX(%rsp), %rcx
+#if DL_RUNTIME_RESOLVE_REALIGN_STACK
+ mov %RBX_LP, %RSP_LP
+ cfi_def_cfa_register(%rsp)
+ movq -24(%rsp), %rbx
+ cfi_restore(%rbx)
+#else
+ add $REGISTER_SAVE_AREA, %RSP_LP
+ cfi_adjust_cfa_offset(-REGISTER_SAVE_AREA)
+#endif
+ jmp 1b
+ cfi_endproc
+ .size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
+
+#undef STATE_SAVE_ALIGNMENT
diff --git a/sysdeps/x86_64/dl-tlsdesc.S b/sysdeps/x86_64/dl-tlsdesc.S
index f748af2ece8de09a..ea69f5223a77e0c0 100644
--- a/sysdeps/x86_64/dl-tlsdesc.S
+++ b/sysdeps/x86_64/dl-tlsdesc.S
@@ -18,7 +18,19 @@
#include <sysdep.h>
#include <tls.h>
+#include <cpu-features-offsets.h>
+#include <features-offsets.h>
#include "tlsdesc.h"
+#include "dl-trampoline-save.h"
+
+/* Area on stack to save and restore registers used for parameter
+ passing when calling _dl_tlsdesc_dynamic. */
+#define REGISTER_SAVE_RCX 0
+#define REGISTER_SAVE_RDX (REGISTER_SAVE_RCX + 8)
+#define REGISTER_SAVE_R8 (REGISTER_SAVE_RDX + 8)
+#define REGISTER_SAVE_R9 (REGISTER_SAVE_R8 + 8)
+#define REGISTER_SAVE_R10 (REGISTER_SAVE_R9 + 8)
+#define REGISTER_SAVE_R11 (REGISTER_SAVE_R10 + 8)
.text
@@ -67,80 +79,24 @@ _dl_tlsdesc_undefweak:
.size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
#ifdef SHARED
- .hidden _dl_tlsdesc_dynamic
- .global _dl_tlsdesc_dynamic
- .type _dl_tlsdesc_dynamic,@function
-
- /* %rax points to the TLS descriptor, such that 0(%rax) points to
- _dl_tlsdesc_dynamic itself, and 8(%rax) points to a struct
- tlsdesc_dynamic_arg object. It must return in %rax the offset
- between the thread pointer and the object denoted by the
- argument, without clobbering any registers.
-
- The assembly code that follows is a rendition of the following
- C code, hand-optimized a little bit.
-
-ptrdiff_t
-_dl_tlsdesc_dynamic (register struct tlsdesc *tdp asm ("%rax"))
-{
- struct tlsdesc_dynamic_arg *td = tdp->arg;
- dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + DTV_OFFSET);
- if (__builtin_expect (td->gen_count <= dtv[0].counter
- && (dtv[td->tlsinfo.ti_module].pointer.val
- != TLS_DTV_UNALLOCATED),
- 1))
- return dtv[td->tlsinfo.ti_module].pointer.val + td->tlsinfo.ti_offset
- - __thread_pointer;
-
- return __tls_get_addr_internal (&td->tlsinfo) - __thread_pointer;
-}
-*/
- cfi_startproc
- .align 16
-_dl_tlsdesc_dynamic:
- _CET_ENDBR
- /* Preserve call-clobbered registers that we modify.
- We need two scratch regs anyway. */
- movq %rsi, -16(%rsp)
- mov %fs:DTV_OFFSET, %RSI_LP
- movq %rdi, -8(%rsp)
- movq TLSDESC_ARG(%rax), %rdi
- movq (%rsi), %rax
- cmpq %rax, TLSDESC_GEN_COUNT(%rdi)
- ja .Lslow
- movq TLSDESC_MODID(%rdi), %rax
- salq $4, %rax
- movq (%rax,%rsi), %rax
- cmpq $-1, %rax
- je .Lslow
- addq TLSDESC_MODOFF(%rdi), %rax
-.Lret:
- movq -16(%rsp), %rsi
- sub %fs:0, %RAX_LP
- movq -8(%rsp), %rdi
- ret
-.Lslow:
- /* Besides rdi and rsi, saved above, save rdx, rcx, r8, r9,
- r10 and r11. Also, align the stack, that's off by 8 bytes. */
- subq $72, %rsp
- cfi_adjust_cfa_offset (72)
- movq %rdx, 8(%rsp)
- movq %rcx, 16(%rsp)
- movq %r8, 24(%rsp)
- movq %r9, 32(%rsp)
- movq %r10, 40(%rsp)
- movq %r11, 48(%rsp)
- /* %rdi already points to the tlsinfo data structure. */
- call HIDDEN_JUMPTARGET (__tls_get_addr)
- movq 8(%rsp), %rdx
- movq 16(%rsp), %rcx
- movq 24(%rsp), %r8
- movq 32(%rsp), %r9
- movq 40(%rsp), %r10
- movq 48(%rsp), %r11
- addq $72, %rsp
- cfi_adjust_cfa_offset (-72)
- jmp .Lret
- cfi_endproc
- .size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
+# define USE_FXSAVE
+# define STATE_SAVE_ALIGNMENT 16
+# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_fxsave
+# include "dl-tlsdesc-dynamic.h"
+# undef _dl_tlsdesc_dynamic
+# undef USE_FXSAVE
+
+# define USE_XSAVE
+# define STATE_SAVE_ALIGNMENT 64
+# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_xsave
+# include "dl-tlsdesc-dynamic.h"
+# undef _dl_tlsdesc_dynamic
+# undef USE_XSAVE
+
+# define USE_XSAVEC
+# define STATE_SAVE_ALIGNMENT 64
+# define _dl_tlsdesc_dynamic _dl_tlsdesc_dynamic_xsavec
+# include "dl-tlsdesc-dynamic.h"
+# undef _dl_tlsdesc_dynamic
+# undef USE_XSAVEC
#endif /* SHARED */
diff --git a/sysdeps/x86_64/dl-trampoline-save.h b/sysdeps/x86_64/dl-trampoline-save.h
new file mode 100644
index 0000000000000000..84eac4a8ac13ad86
--- /dev/null
+++ b/sysdeps/x86_64/dl-trampoline-save.h
@@ -0,0 +1,34 @@
+/* x86-64 PLT trampoline register save macros.
+ Copyright (C) 2024 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/>. */
+
+#ifndef DL_STACK_ALIGNMENT
+/* Due to GCC bug:
+
+ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
+
+ __tls_get_addr may be called with 8-byte stack alignment. Although
+ this bug has been fixed in GCC 4.9.4, 5.3 and 6, we can't assume
+ that stack will be always aligned at 16 bytes. */
+# define DL_STACK_ALIGNMENT 8
+#endif
+
+/* True if _dl_runtime_resolve should align stack for STATE_SAVE or align
+ stack to 16 bytes before calling _dl_fixup. */
+#define DL_RUNTIME_RESOLVE_REALIGN_STACK \
+ (STATE_SAVE_ALIGNMENT > DL_STACK_ALIGNMENT \
+ || 16 > DL_STACK_ALIGNMENT)
diff --git a/sysdeps/x86_64/dl-trampoline-state.h b/sysdeps/x86_64/dl-trampoline-state.h
new file mode 100644
index 0000000000000000..575f120797860583
--- /dev/null
+++ b/sysdeps/x86_64/dl-trampoline-state.h
@@ -0,0 +1,51 @@
+/* x86-64 PLT dl-trampoline state macros.
+ Copyright (C) 2024 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/>. */
+
+#if (STATE_SAVE_ALIGNMENT % 16) != 0
+# error STATE_SAVE_ALIGNMENT must be multiple of 16
+#endif
+
+#if (STATE_SAVE_OFFSET % STATE_SAVE_ALIGNMENT) != 0
+# error STATE_SAVE_OFFSET must be multiple of STATE_SAVE_ALIGNMENT
+#endif
+
+#if DL_RUNTIME_RESOLVE_REALIGN_STACK
+/* Local stack area before jumping to function address: RBX. */
+# define LOCAL_STORAGE_AREA 8
+# define BASE rbx
+# ifdef USE_FXSAVE
+/* Use fxsave to save XMM registers. */
+# define REGISTER_SAVE_AREA (512 + STATE_SAVE_OFFSET)
+# if (REGISTER_SAVE_AREA % 16) != 0
+# error REGISTER_SAVE_AREA must be multiple of 16
+# endif
+# endif
+#else
+# ifndef USE_FXSAVE
+# error USE_FXSAVE must be defined
+# endif
+/* Use fxsave to save XMM registers. */
+# define REGISTER_SAVE_AREA (512 + STATE_SAVE_OFFSET + 8)
+/* Local stack area before jumping to function address: All saved
+ registers. */
+# define LOCAL_STORAGE_AREA REGISTER_SAVE_AREA
+# define BASE rsp
+# if (REGISTER_SAVE_AREA % 16) != 8
+# error REGISTER_SAVE_AREA must be odd multiple of 8
+# endif
+#endif
diff --git a/sysdeps/x86_64/dl-trampoline.S b/sysdeps/x86_64/dl-trampoline.S
index b2e7e0f69b709ffd..87c5137837f01a63 100644
--- a/sysdeps/x86_64/dl-trampoline.S
+++ b/sysdeps/x86_64/dl-trampoline.S
@@ -22,25 +22,7 @@
#include <features-offsets.h>
#include <link-defines.h>
#include <isa-level.h>
-
-#ifndef DL_STACK_ALIGNMENT
-/* Due to GCC bug:
-
- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
-
- __tls_get_addr may be called with 8-byte stack alignment. Although
- this bug has been fixed in GCC 4.9.4, 5.3 and 6, we can't assume
- that stack will be always aligned at 16 bytes. We use unaligned
- 16-byte move to load and store SSE registers, which has no penalty
- on modern processors if stack is 16-byte aligned. */
-# define DL_STACK_ALIGNMENT 8
-#endif
-
-/* True if _dl_runtime_resolve should align stack for STATE_SAVE or align
- stack to 16 bytes before calling _dl_fixup. */
-#define DL_RUNTIME_RESOLVE_REALIGN_STACK \
- (STATE_SAVE_ALIGNMENT > DL_STACK_ALIGNMENT \
- || 16 > DL_STACK_ALIGNMENT)
+#include "dl-trampoline-save.h"
/* Area on stack to save and restore registers used for parameter
passing when calling _dl_fixup. */
diff --git a/sysdeps/x86_64/dl-trampoline.h b/sysdeps/x86_64/dl-trampoline.h
index f55c6ea040b9d319..d9ccfb40d46d3312 100644
--- a/sysdeps/x86_64/dl-trampoline.h
+++ b/sysdeps/x86_64/dl-trampoline.h
@@ -27,39 +27,7 @@
# undef LOCAL_STORAGE_AREA
# undef BASE
-# if (STATE_SAVE_ALIGNMENT % 16) != 0
-# error STATE_SAVE_ALIGNMENT must be multiple of 16
-# endif
-
-# if (STATE_SAVE_OFFSET % STATE_SAVE_ALIGNMENT) != 0
-# error STATE_SAVE_OFFSET must be multiple of STATE_SAVE_ALIGNMENT
-# endif
-
-# if DL_RUNTIME_RESOLVE_REALIGN_STACK
-/* Local stack area before jumping to function address: RBX. */
-# define LOCAL_STORAGE_AREA 8
-# define BASE rbx
-# ifdef USE_FXSAVE
-/* Use fxsave to save XMM registers. */
-# define REGISTER_SAVE_AREA (512 + STATE_SAVE_OFFSET)
-# if (REGISTER_SAVE_AREA % 16) != 0
-# error REGISTER_SAVE_AREA must be multiple of 16
-# endif
-# endif
-# else
-# ifndef USE_FXSAVE
-# error USE_FXSAVE must be defined
-# endif
-/* Use fxsave to save XMM registers. */
-# define REGISTER_SAVE_AREA (512 + STATE_SAVE_OFFSET + 8)
-/* Local stack area before jumping to function address: All saved
- registers. */
-# define LOCAL_STORAGE_AREA REGISTER_SAVE_AREA
-# define BASE rsp
-# if (REGISTER_SAVE_AREA % 16) != 8
-# error REGISTER_SAVE_AREA must be odd multiple of 8
-# endif
-# endif
+# include "dl-trampoline-state.h"
.globl _dl_runtime_resolve
.hidden _dl_runtime_resolve
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