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* [glibc] elf: Introduce <dl-call_tls_init_tp.h> and call_tls_init_tp (bug 29249)
@ 2022-11-03 16:28 Florian Weimer
0 siblings, 0 replies; only message in thread
From: Florian Weimer @ 2022-11-03 16:28 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1f34a2328890aa192141f96449d25b77f666bf47
commit 1f34a2328890aa192141f96449d25b77f666bf47
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu Nov 3 17:28:03 2022 +0100
elf: Introduce <dl-call_tls_init_tp.h> and call_tls_init_tp (bug 29249)
This makes it more likely that the compiler can compute the strlen
argument in _startup_fatal at compile time, which is required to
avoid a dependency on strlen this early during process startup.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Diff:
---
csu/libc-tls.c | 14 +++++---------
elf/rtld.c | 14 +++-----------
sysdeps/aarch64/nptl/tls.h | 2 +-
sysdeps/alpha/nptl/tls.h | 2 +-
sysdeps/arc/nptl/tls.h | 3 +--
sysdeps/csky/nptl/tls.h | 3 +--
sysdeps/generic/dl-call_tls_init_tp.h | 34 ++++++++++++++++++++++++++++++++++
sysdeps/generic/startup.h | 2 +-
sysdeps/hppa/nptl/tls.h | 2 +-
sysdeps/i386/nptl/tls.h | 3 +--
sysdeps/ia64/nptl/tls.h | 2 +-
sysdeps/loongarch/nptl/tls.h | 2 +-
sysdeps/m68k/nptl/tls.h | 2 +-
sysdeps/mach/hurd/i386/tls.h | 10 +++++-----
sysdeps/microblaze/nptl/tls.h | 2 +-
sysdeps/mips/nptl/tls.h | 3 +--
sysdeps/nios2/nptl/tls.h | 2 +-
sysdeps/or1k/nptl/tls.h | 2 +-
sysdeps/powerpc/nptl/tls.h | 2 +-
sysdeps/riscv/nptl/tls.h | 2 +-
sysdeps/s390/nptl/tls.h | 2 +-
sysdeps/sh/nptl/tls.h | 2 +-
sysdeps/sparc/nptl/tls.h | 2 +-
sysdeps/unix/sysv/linux/arm/tls.h | 3 +--
sysdeps/x86_64/nptl/tls.h | 2 +-
25 files changed, 68 insertions(+), 51 deletions(-)
diff --git a/csu/libc-tls.c b/csu/libc-tls.c
index 0a216c5502..ca4def2613 100644
--- a/csu/libc-tls.c
+++ b/csu/libc-tls.c
@@ -25,6 +25,7 @@
#include <sys/param.h>
#include <array_length.h>
#include <pthreadP.h>
+#include <dl-call_tls_init_tp.h>
#ifdef SHARED
#error makefile bug, this file is for static only
@@ -147,14 +148,14 @@ __libc_setup_tls (void)
tcb_offset = roundup (memsz + GLRO(dl_tls_static_surplus), max_align);
tlsblock = _dl_early_allocate (tcb_offset + TLS_INIT_TCB_SIZE + max_align);
if (tlsblock == NULL)
- _startup_fatal ("Fatal glibc error: Cannot allocate TLS block\n");
+ _startup_fatal_tls_error ();
#elif TLS_DTV_AT_TP
tcb_offset = roundup (TLS_INIT_TCB_SIZE, align ?: 1);
tlsblock = _dl_early_allocate (tcb_offset + memsz + max_align
+ TLS_PRE_TCB_SIZE
+ GLRO(dl_tls_static_surplus));
if (tlsblock == NULL)
- _startup_fatal ("Fatal glibc error: Cannot allocate TLS block\n");
+ _startup_fatal_tls_error ();
tlsblock += TLS_PRE_TCB_SIZE;
#else
/* In case a model with a different layout for the TCB and DTV
@@ -191,16 +192,11 @@ __libc_setup_tls (void)
#if TLS_TCB_AT_TP
INSTALL_DTV ((char *) tlsblock + tcb_offset, _dl_static_dtv);
- const char *lossage = TLS_INIT_TP ((char *) tlsblock + tcb_offset);
+ call_tls_init_tp ((char *) tlsblock + tcb_offset);
#elif TLS_DTV_AT_TP
INSTALL_DTV (tlsblock, _dl_static_dtv);
- const char *lossage = TLS_INIT_TP (tlsblock);
-#else
-# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+ call_tls_init_tp (tlsblock);
#endif
- if (__builtin_expect (lossage != NULL, 0))
- _startup_fatal (lossage);
- __tls_init_tp ();
/* Update the executable's link map with enough information to make
the TLS routines happy. */
diff --git a/elf/rtld.c b/elf/rtld.c
index 8671594f1f..70ad1acc43 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -52,6 +52,7 @@
#include <dl-execve.h>
#include <dl-find_object.h>
#include <dl-audit-check.h>
+#include <dl-call_tls_init_tp.h>
#include <assert.h>
@@ -796,10 +797,7 @@ cannot allocate TLS data structures for initial thread\n");
GL(dl_initial_dtv) = GET_DTV (tcbp);
/* And finally install it for the main thread. */
- const char *lossage = TLS_INIT_TP (tcbp);
- if (__glibc_unlikely (lossage != NULL))
- _dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage);
- __tls_init_tp ();
+ call_tls_init_tp (tcbp);
__rtld_tls_init_tp_called = true;
return tcbp;
@@ -2348,13 +2346,7 @@ dl_main (const ElfW(Phdr) *phdr,
/* And finally install it for the main thread. */
if (! __rtld_tls_init_tp_called)
- {
- const char *lossage = TLS_INIT_TP (tcbp);
- if (__glibc_unlikely (lossage != NULL))
- _dl_fatal_printf ("cannot set up thread-local storage: %s\n",
- lossage);
- __tls_init_tp ();
- }
+ call_tls_init_tp (tcbp);
/* Make sure no new search directories have been added. */
assert (GLRO(dl_init_all_dirs) == GL(dl_all_dirs));
diff --git a/sysdeps/aarch64/nptl/tls.h b/sysdeps/aarch64/nptl/tls.h
index 08aa2eff89..6fe084c1ef 100644
--- a/sysdeps/aarch64/nptl/tls.h
+++ b/sysdeps/aarch64/nptl/tls.h
@@ -72,7 +72,7 @@ typedef struct
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched. */
# define TLS_INIT_TP(tcbp) \
- ({ __asm __volatile ("msr tpidr_el0, %0" : : "r" (tcbp)); NULL; })
+ ({ __asm __volatile ("msr tpidr_el0, %0" : : "r" (tcbp)); true; })
/* Value passed to 'clone' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
diff --git a/sysdeps/alpha/nptl/tls.h b/sysdeps/alpha/nptl/tls.h
index 8f5b69ad3b..48dc1369fc 100644
--- a/sysdeps/alpha/nptl/tls.h
+++ b/sysdeps/alpha/nptl/tls.h
@@ -69,7 +69,7 @@ typedef struct
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched. */
# define TLS_INIT_TP(tcbp) \
- (__builtin_set_thread_pointer ((void *)(tcbp)), NULL)
+ (__builtin_set_thread_pointer ((void *)(tcbp)), true)
/* Value passed to 'clone' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
diff --git a/sysdeps/arc/nptl/tls.h b/sysdeps/arc/nptl/tls.h
index 7fc6602b23..948e618a3a 100644
--- a/sysdeps/arc/nptl/tls.h
+++ b/sysdeps/arc/nptl/tls.h
@@ -75,8 +75,7 @@ typedef struct
long result_var; \
__builtin_set_thread_pointer (tcbp); \
result_var = INTERNAL_SYSCALL_CALL (arc_settls, (tcbp));\
- INTERNAL_SYSCALL_ERROR_P (result_var) \
- ? "settls syscall error" : NULL; \
+ !INTERNAL_SYSCALL_ERROR_P (result_var); \
})
/* Value passed to 'clone' for initialization of the thread register. */
diff --git a/sysdeps/csky/nptl/tls.h b/sysdeps/csky/nptl/tls.h
index 58d6ab0fb2..3f7afc9339 100644
--- a/sysdeps/csky/nptl/tls.h
+++ b/sysdeps/csky/nptl/tls.h
@@ -92,8 +92,7 @@ typedef struct
({ long int result_var; \
result_var = INTERNAL_SYSCALL_CALL (set_thread_area, \
(char *) (tcbp) + TLS_TCB_OFFSET); \
- INTERNAL_SYSCALL_ERROR_P (result_var) \
- ? "unknown error" : NULL; })
+ !INTERNAL_SYSCALL_ERROR_P (result_var); })
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
diff --git a/sysdeps/generic/dl-call_tls_init_tp.h b/sysdeps/generic/dl-call_tls_init_tp.h
new file mode 100644
index 0000000000..411feda3fc
--- /dev/null
+++ b/sysdeps/generic/dl-call_tls_init_tp.h
@@ -0,0 +1,34 @@
+/* Invoke TLS_INIT_TP and __tls_init_tp with error handling.
+ Copyright (C) 2022 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 <startup.h>
+#include <tls.h>
+
+static inline void
+_startup_fatal_tls_error (void)
+{
+ _startup_fatal ("Fatal glibc error: Cannot allocate TLS block\n");
+}
+
+static inline void
+call_tls_init_tp (void *addr)
+{
+ if (!TLS_INIT_TP (addr))
+ _startup_fatal_tls_error ();
+ __tls_init_tp ();
+}
diff --git a/sysdeps/generic/startup.h b/sysdeps/generic/startup.h
index 45979ab231..4b444511b4 100644
--- a/sysdeps/generic/startup.h
+++ b/sysdeps/generic/startup.h
@@ -19,7 +19,7 @@
/* Targets should override this file if the default definitions below
will not work correctly very early before TLS is initialized. */
-#include <unistd.h>
+#include <stdio.h>
/* Use macro instead of inline function to avoid including <stdio.h>. */
#define _startup_fatal(message) __libc_fatal ((message))
diff --git a/sysdeps/hppa/nptl/tls.h b/sysdeps/hppa/nptl/tls.h
index e6b0bd5c71..6af22cdc00 100644
--- a/sysdeps/hppa/nptl/tls.h
+++ b/sysdeps/hppa/nptl/tls.h
@@ -74,7 +74,7 @@ typedef struct
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched. */
# define TLS_INIT_TP(tcbp) \
- ({ __set_cr27(tcbp); NULL; })
+ ({ __set_cr27(tcbp); true; })
/* Value passed to 'clone' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
diff --git a/sysdeps/i386/nptl/tls.h b/sysdeps/i386/nptl/tls.h
index 91090bf287..553b55b3f2 100644
--- a/sysdeps/i386/nptl/tls.h
+++ b/sysdeps/i386/nptl/tls.h
@@ -203,8 +203,7 @@ tls_fill_user_desc (union user_desc_init *desc,
which is necessary since we have changed it. */ \
TLS_SET_GS (_segdescr.desc.entry_number * 8 + 3); \
\
- _result == 0 ? NULL \
- : "set_thread_area failed when setting up thread-local storage\n"; })
+ _result == 0; })
# define TLS_DEFINE_INIT_TP(tp, pd) \
union user_desc_init _segdescr; \
diff --git a/sysdeps/ia64/nptl/tls.h b/sysdeps/ia64/nptl/tls.h
index d2411b3c1a..4085c56832 100644
--- a/sysdeps/ia64/nptl/tls.h
+++ b/sysdeps/ia64/nptl/tls.h
@@ -105,7 +105,7 @@ register struct pthread *__thread_self __asm__("r13");
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched. */
# define TLS_INIT_TP(thrdescr) \
- (__thread_self = (thrdescr), INIT_SYSINFO, NULL)
+ (__thread_self = (thrdescr), INIT_SYSINFO, true)
/* Value passed to 'clone2' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) \
diff --git a/sysdeps/loongarch/nptl/tls.h b/sysdeps/loongarch/nptl/tls.h
index 24bffe3a0a..e8b616854f 100644
--- a/sysdeps/loongarch/nptl/tls.h
+++ b/sysdeps/loongarch/nptl/tls.h
@@ -83,7 +83,7 @@ typedef struct
#define TLS_INIT_TP(tcbp) \
({ \
__thread_self = (char *) tcbp + TLS_TCB_OFFSET; \
- NULL; \
+ true; \
})
/* Return the address of the dtv for the current thread. */
diff --git a/sysdeps/m68k/nptl/tls.h b/sysdeps/m68k/nptl/tls.h
index 742e1b6767..ebcc118bbe 100644
--- a/sysdeps/m68k/nptl/tls.h
+++ b/sysdeps/m68k/nptl/tls.h
@@ -90,7 +90,7 @@ typedef struct
\
_sys_result = INTERNAL_SYSCALL_CALL (set_thread_area, \
((void *) (tcbp)) + TLS_TCB_OFFSET); \
- INTERNAL_SYSCALL_ERROR_P (_sys_result) ? "unknown error" : NULL; })
+ !INTERNAL_SYSCALL_ERROR_P (_sys_result); })
# define TLS_DEFINE_INIT_TP(tp, pd) \
void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE
diff --git a/sysdeps/mach/hurd/i386/tls.h b/sysdeps/mach/hurd/i386/tls.h
index 602bacc0de..2847e3ee61 100644
--- a/sysdeps/mach/hurd/i386/tls.h
+++ b/sysdeps/mach/hurd/i386/tls.h
@@ -117,12 +117,12 @@ extern unsigned short __init1_desc;
# define HURD_SEL_LDT(sel) (__builtin_expect ((sel) & 4, 0))
-static inline const char * __attribute__ ((unused))
+static inline bool __attribute__ ((unused))
_hurd_tls_init (tcbhead_t *tcb)
{
HURD_TLS_DESC_DECL (desc, tcb);
thread_t self = __mach_thread_self ();
- const char *msg = NULL;
+ bool success = true;
/* This field is used by TLS accesses to get our "thread pointer"
from the TLS point of view. */
@@ -141,14 +141,14 @@ _hurd_tls_init (tcbhead_t *tcb)
assert_perror (err);
if (err)
{
- msg = "i386_set_ldt failed";
+ success = false;
goto out;
}
}
else if (err)
{
assert_perror (err); /* Separate from above with different line #. */
- msg = "i386_set_gdt failed";
+ success = false;
goto out;
}
@@ -157,7 +157,7 @@ _hurd_tls_init (tcbhead_t *tcb)
out:
__mach_port_deallocate (__mach_task_self (), self);
- return msg;
+ return success;
}
/* Code to initially initialize the thread pointer. This might need
diff --git a/sysdeps/microblaze/nptl/tls.h b/sysdeps/microblaze/nptl/tls.h
index 588fd1c5d6..d8be1932b9 100644
--- a/sysdeps/microblaze/nptl/tls.h
+++ b/sysdeps/microblaze/nptl/tls.h
@@ -75,7 +75,7 @@ typedef struct
/* Code to initially initialize the thread pointer.
r21 is reserved for thread pointer. */
# define TLS_INIT_TP(tcbp) \
- ({ __asm __volatile ("or r21,r0,%0" : : "r" ((void *)tcbp)); NULL; })
+ ({ __asm __volatile ("or r21,r0,%0" : : "r" ((void *)tcbp)); true; })
# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
diff --git a/sysdeps/mips/nptl/tls.h b/sysdeps/mips/nptl/tls.h
index 2aa7cb4bb8..bac6e8771c 100644
--- a/sysdeps/mips/nptl/tls.h
+++ b/sysdeps/mips/nptl/tls.h
@@ -116,8 +116,7 @@ typedef struct
({ long int result_var; \
result_var = INTERNAL_SYSCALL_CALL (set_thread_area, \
(char *) (tcbp) + TLS_TCB_OFFSET); \
- INTERNAL_SYSCALL_ERROR_P (result_var) \
- ? "unknown error" : NULL; })
+ !INTERNAL_SYSCALL_ERROR_P (result_var); })
/* Value passed to 'clone' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) \
diff --git a/sysdeps/nios2/nptl/tls.h b/sysdeps/nios2/nptl/tls.h
index cb231e2a4b..f5a9713f93 100644
--- a/sysdeps/nios2/nptl/tls.h
+++ b/sysdeps/nios2/nptl/tls.h
@@ -88,7 +88,7 @@ register struct pthread *__thread_self __asm__("r23");
/* Code to initially initialize the thread pointer. */
# define TLS_INIT_TP(tcbp) \
- (__thread_self = (struct pthread *) ((char *) tcbp + TLS_TCB_OFFSET), NULL)
+ (__thread_self = (struct pthread *) ((char *) tcbp + TLS_TCB_OFFSET), true)
/* Value passed to 'clone' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) \
diff --git a/sysdeps/or1k/nptl/tls.h b/sysdeps/or1k/nptl/tls.h
index e82f444738..eda0e893ae 100644
--- a/sysdeps/or1k/nptl/tls.h
+++ b/sysdeps/or1k/nptl/tls.h
@@ -112,7 +112,7 @@ register tcbhead_t *__thread_self __asm__("r10");
It's hard to fail this, so return NULL always. */
# define TLS_INIT_TP(tcbp) \
- ({__thread_self = ((tcbhead_t *)tcbp + 1); NULL;})
+ ({__thread_self = ((tcbhead_t *)tcbp + 1); true;})
/* Value passed to 'clone' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) \
diff --git a/sysdeps/powerpc/nptl/tls.h b/sysdeps/powerpc/nptl/tls.h
index e62a96238a..68a1d8b546 100644
--- a/sysdeps/powerpc/nptl/tls.h
+++ b/sysdeps/powerpc/nptl/tls.h
@@ -139,7 +139,7 @@ typedef struct
__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET; \
THREAD_SET_HWCAP (__tcb.hwcap); \
THREAD_SET_AT_PLATFORM (__tcb.at_platform); \
- NULL; \
+ true; \
})
/* Value passed to 'clone' for initialization of the thread register. */
diff --git a/sysdeps/riscv/nptl/tls.h b/sysdeps/riscv/nptl/tls.h
index 700c2f5189..b221980399 100644
--- a/sysdeps/riscv/nptl/tls.h
+++ b/sysdeps/riscv/nptl/tls.h
@@ -79,7 +79,7 @@ typedef struct
/* Code to initially initialize the thread pointer. */
# define TLS_INIT_TP(tcbp) \
- ({ __thread_self = (char*)tcbp + TLS_TCB_OFFSET; NULL; })
+ ({ __thread_self = (char*)tcbp + TLS_TCB_OFFSET; true; })
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
diff --git a/sysdeps/s390/nptl/tls.h b/sysdeps/s390/nptl/tls.h
index 98d7870148..937c49dda6 100644
--- a/sysdeps/s390/nptl/tls.h
+++ b/sysdeps/s390/nptl/tls.h
@@ -112,7 +112,7 @@ typedef struct
INIT_SYSINFO; \
\
__builtin_set_thread_pointer (_thrdescr); \
- NULL; \
+ true; \
})
/* Value passed to 'clone' for initialization of the thread register. */
diff --git a/sysdeps/sh/nptl/tls.h b/sysdeps/sh/nptl/tls.h
index 1530489a6c..3882114f5c 100644
--- a/sysdeps/sh/nptl/tls.h
+++ b/sysdeps/sh/nptl/tls.h
@@ -83,7 +83,7 @@ typedef struct
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched. */
# define TLS_INIT_TP(tcbp) \
- ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); NULL; })
+ ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); true; })
# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
diff --git a/sysdeps/sparc/nptl/tls.h b/sysdeps/sparc/nptl/tls.h
index 95a69cb824..e8fbe40e7b 100644
--- a/sysdeps/sparc/nptl/tls.h
+++ b/sysdeps/sparc/nptl/tls.h
@@ -89,7 +89,7 @@ register struct pthread *__thread_self __asm__("%g7");
/* Code to initially initialize the thread pointer. */
# define TLS_INIT_TP(descr) \
- (__thread_self = (__typeof (__thread_self)) (descr), NULL)
+ (__thread_self = (__typeof (__thread_self)) (descr), true)
/* Value passed to 'clone' for initialization of the thread register. */
# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd)
diff --git a/sysdeps/unix/sysv/linux/arm/tls.h b/sysdeps/unix/sysv/linux/arm/tls.h
index 9d1601af44..045fad2275 100644
--- a/sysdeps/unix/sysv/linux/arm/tls.h
+++ b/sysdeps/unix/sysv/linux/arm/tls.h
@@ -33,8 +33,7 @@
# define TLS_INIT_TP(tcbp) \
({ long int result_var; \
result_var = INTERNAL_SYSCALL_CALL (set_tls, (tcbp)); \
- INTERNAL_SYSCALL_ERROR_P (result_var) \
- ? "unknown error" : NULL; })
+ !INTERNAL_SYSCALL_ERROR_P (result_var); })
#endif /* __ASSEMBLER__ */
diff --git a/sysdeps/x86_64/nptl/tls.h b/sysdeps/x86_64/nptl/tls.h
index 75f8020975..63744f6384 100644
--- a/sysdeps/x86_64/nptl/tls.h
+++ b/sysdeps/x86_64/nptl/tls.h
@@ -156,7 +156,7 @@ _Static_assert (offsetof (tcbhead_t, __glibc_unused2) == 0x80,
"S" (_thrdescr) \
: "memory", "cc", "r11", "cx"); \
\
- _result ? "cannot set %fs base address for thread-local storage" : 0; \
+ _result == 0; \
})
# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd)
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