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Support six-argument syscalls from C for 32-bit x86, use generic lowlevellock-futex.h (bug 18138).
This patch follows the approach outlined in <https://sourceware.org/ml/libc-alpha/2015-03/msg00656.html> to support six-argument syscalls from INTERNAL_SYSCALL for 32-bit x86, making them call a function __libc_do_syscall that takes the syscall number and three syscall arguments in the registers in which the kernel expects them, along with a pointer to a structure containing the other three arguments. In turn, this allows the generic lowlevellock-futex.h to be used on 32-bit x86, so supporting lll_futex_timed_wait_bitset (and so allowing FUTEX_CLOCK_REALTIME to be used in various cases, so fixing bug 18138 for 32-bit x86 and leaving hppa as the only architecture missing lll_futex_timed_wait_bitset). The change to lowlevellock.h's definition of SYS_futex is because the generic lowlevelloc-futex.h ends up bringing in bits/syscall.h which defines SYS_futex to __NR_futex, so resulting in redefinition errors. The revised definition in lowlevellock.h is in line with what the x86_64 version does. __libc_do_syscall is only needed in libpthread at present (meaning nothing special needs to be done to make it shared-only in most libraries containing it, static in libc only, as on ARM). Tested for 32-bit x86, with the glibc testsuite and with the test in bug 18138. The failures seen FAIL: nptl/tst-cleanupx4 FAIL: rt/tst-cpuclock2 are pre-existing. [BZ #18138] * sysdeps/unix/sysv/linux/i386/sysdep.h (struct libc_do_syscall_args): New structure. (INTERNAL_SYSCALL_MAIN_0): New macro. (INTERNAL_SYSCALL_MAIN_1): Likewise. (INTERNAL_SYSCALL_MAIN_2): Likewise. (INTERNAL_SYSCALL_MAIN_3): Likewise. (INTERNAL_SYSCALL_MAIN_4): Likewise. (INTERNAL_SYSCALL_MAIN_5): Likewise. (INTERNAL_SYSCALL_MAIN_6): Likewise. Call __libc_do_syscall. (INTERNAL_SYSCALL): Define to use INTERNAL_SYSCALL_MAIN_##nr. Replace conditional definitions by conditional definitions of .... (INTERNAL_SYSCALL_MAIN_INLINE): ... this. New macro. * sysdeps/unix/sysv/linux/i386/libc-do-syscall.S: New file. * sysdeps/unix/sysv/linux/i386/Makefile [$(subdir) = nptl] (libpthread-sysdep_routines): Add libc-do-syscall. * sysdeps/unix/sysv/linux/i386/lowlevellock-futex.h: Remove file. * sysdeps/unix/sysv/linux/i386/lowlevellock.h (SYS_futex): Define to __NR_futex not 240.
This commit is contained in:
Joseph Myers
parent
afcd9480fe
commit
a9fe4c5aa8
22
ChangeLog
22
ChangeLog
@ -1,3 +1,25 @@
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2015-03-25 Joseph Myers <joseph@codesourcery.com>
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[BZ #18138]
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* sysdeps/unix/sysv/linux/i386/sysdep.h (struct
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libc_do_syscall_args): New structure.
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(INTERNAL_SYSCALL_MAIN_0): New macro.
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(INTERNAL_SYSCALL_MAIN_1): Likewise.
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(INTERNAL_SYSCALL_MAIN_2): Likewise.
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(INTERNAL_SYSCALL_MAIN_3): Likewise.
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(INTERNAL_SYSCALL_MAIN_4): Likewise.
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(INTERNAL_SYSCALL_MAIN_5): Likewise.
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(INTERNAL_SYSCALL_MAIN_6): Likewise. Call __libc_do_syscall.
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(INTERNAL_SYSCALL): Define to use INTERNAL_SYSCALL_MAIN_##nr.
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Replace conditional definitions by conditional definitions of ....
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(INTERNAL_SYSCALL_MAIN_INLINE): ... this. New macro.
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* sysdeps/unix/sysv/linux/i386/libc-do-syscall.S: New file.
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* sysdeps/unix/sysv/linux/i386/Makefile [$(subdir) = nptl]
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(libpthread-sysdep_routines): Add libc-do-syscall.
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* sysdeps/unix/sysv/linux/i386/lowlevellock-futex.h: Remove file.
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* sysdeps/unix/sysv/linux/i386/lowlevellock.h (SYS_futex): Define
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to __NR_futex not 240.
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2015-03-25 Alan Modra <amodra@gmail.com>
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* NEWS: Advertise TLS optimization.
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@ -14,6 +14,11 @@ ifeq ($(subdir),io)
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sysdep_routines += call_sync_file_range
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endif
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# libpthread uses six-argument inline syscalls.
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ifeq ($(subdir),nptl)
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libpthread-sysdep_routines += libc-do-syscall
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endif
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ifeq ($(subdir),resource)
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sysdep_routines += oldgetrlimit64
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endif
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50
sysdeps/unix/sysv/linux/i386/libc-do-syscall.S
Normal file
50
sysdeps/unix/sysv/linux/i386/libc-do-syscall.S
Normal file
@ -0,0 +1,50 @@
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/* Out-of-line syscall stub for six-argument syscalls from C.
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Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* %eax, %ecx, %edx and %esi contain the values expected by the kernel.
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%edi points to a structure with the values of %ebx, %edi and %ebp. */
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.hidden __libc_do_syscall
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ENTRY (__libc_do_syscall)
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pushl %ebx
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (ebx, 0)
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pushl %edi
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (edi, 0)
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pushl %ebp
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (ebp, 0)
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movl 0(%edi), %ebx
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movl 8(%edi), %ebp
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movl 4(%edi), %edi
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ENTER_KERNEL
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popl %ebp
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cfi_adjust_cfa_offset (-4)
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cfi_restore (ebp)
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popl %edi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (edi)
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popl %ebx
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cfi_adjust_cfa_offset (-4)
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cfi_restore (ebx)
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ret
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END (__libc_do_syscall)
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@ -1,137 +0,0 @@
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/* Low-level locking access to futex facilities. Linux/i386 version.
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Copyright (C) 2014-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _LOWLEVELLOCK_FUTEX_H
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#define _LOWLEVELLOCK_FUTEX_H 1
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_CMP_REQUEUE 4
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#define FUTEX_WAKE_OP 5
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#define FUTEX_LOCK_PI 6
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#define FUTEX_UNLOCK_PI 7
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#define FUTEX_TRYLOCK_PI 8
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#define FUTEX_WAIT_BITSET 9
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#define FUTEX_WAKE_BITSET 10
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#define FUTEX_WAIT_REQUEUE_PI 11
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#define FUTEX_CMP_REQUEUE_PI 12
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#define FUTEX_PRIVATE_FLAG 128
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#define FUTEX_CLOCK_REALTIME 256
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#define FUTEX_BITSET_MATCH_ANY 0xffffffff
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#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
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/* Values for 'private' parameter of locking macros. Yes, the
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definition seems to be backwards. But it is not. The bit will be
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reversed before passing to the system call. */
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#define LLL_PRIVATE 0
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#define LLL_SHARED FUTEX_PRIVATE_FLAG
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#if IS_IN (libc) || IS_IN (rtld)
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/* In libc.so or ld.so all futexes are private. */
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# ifdef __ASSUME_PRIVATE_FUTEX
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# define __lll_private_flag(fl, private) \
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((fl) | FUTEX_PRIVATE_FLAG)
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# else
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# define __lll_private_flag(fl, private) \
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((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
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# endif
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#else
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# ifdef __ASSUME_PRIVATE_FUTEX
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# define __lll_private_flag(fl, private) \
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(((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
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# else
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# define __lll_private_flag(fl, private) \
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(__builtin_constant_p (private) \
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? ((private) == 0 \
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? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \
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: (fl)) \
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: ({ unsigned int __fl = ((private) ^ FUTEX_PRIVATE_FLAG); \
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asm ("andl %%gs:%P1, %0" : "+r" (__fl) \
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: "i" (offsetof (struct pthread, header.private_futex))); \
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__fl | (fl); }))
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# endif
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#endif
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#ifndef __ASSEMBLER__
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/* To avoid naming conflicts with lowlevellock.h, use a different prefix
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here. */
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#ifdef PIC
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# define LLLF_EBX_LOAD "xchgl %2, %%ebx\n"
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# define LLLF_EBX_REG "D"
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#else
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# define LLLF_EBX_LOAD
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# define LLLF_EBX_REG "b"
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#endif
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#ifdef I386_USE_SYSENTER
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# ifdef SHARED
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# define LLLF_ENTER_KERNEL "call *%%gs:%P6\n\t"
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# else
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# define LLLF_ENTER_KERNEL "call *_dl_sysinfo\n\t"
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# endif
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#else
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# define LLLF_ENTER_KERNEL "int $0x80\n\t"
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#endif
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#define lll_futex_wait(futex, val, private) \
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lll_futex_timed_wait (futex, val, NULL, private)
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#define lll_futex_timed_wait(futex, val, timeout, private) \
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({ \
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int __status; \
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register __typeof (val) _val asm ("edx") = (val); \
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__asm __volatile (LLLF_EBX_LOAD \
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LLLF_ENTER_KERNEL \
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LLLF_EBX_LOAD \
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: "=a" (__status) \
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: "0" (SYS_futex), LLLF_EBX_REG (futex), "S" (timeout), \
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"c" (__lll_private_flag (FUTEX_WAIT, private)), \
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"d" (_val), "i" (offsetof (tcbhead_t, sysinfo)) \
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: "memory"); \
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__status; \
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})
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#define lll_futex_wake(futex, nr, private) \
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({ \
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int __status; \
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register __typeof (nr) _nr asm ("edx") = (nr); \
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LIBC_PROBE (lll_futex_wake, 3, futex, nr, private); \
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__asm __volatile (LLLF_EBX_LOAD \
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LLLF_ENTER_KERNEL \
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LLLF_EBX_LOAD \
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: "=a" (__status) \
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: "0" (SYS_futex), LLLF_EBX_REG (futex), \
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"c" (__lll_private_flag (FUTEX_WAKE, private)), \
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"d" (_nr), \
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"i" (0) /* phony, to align next arg's number */, \
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"i" (offsetof (tcbhead_t, sysinfo))); \
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__status; \
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})
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#endif /* !__ASSEMBLER__ */
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#endif /* lowlevellock-futex.h */
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@ -48,7 +48,7 @@
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#include <lowlevellock-futex.h>
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/* XXX Remove when no assembler code uses futexes anymore. */
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#define SYS_futex 240
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#define SYS_futex __NR_futex
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#ifndef __ASSEMBLER__
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@ -304,6 +304,17 @@ asm (".L__X'%ebx = 1\n\t"
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".endif\n\t"
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".endm\n\t");
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/* Six-argument syscalls use an out-of-line helper, because an inline
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asm using all registers apart from %esp cannot work reliably and
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the assembler does not support describing an asm that saves and
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restores %ebp itself as a separate stack frame. This structure
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stores the arguments not passed in registers; %edi is passed with a
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pointer to this structure. */
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struct libc_do_syscall_args
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{
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int ebx, edi, ebp;
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};
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/* Define a macro which expands inline into the wrapper code for a system
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call. */
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#undef INLINE_SYSCALL
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@ -325,11 +336,42 @@ asm (".L__X'%ebx = 1\n\t"
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The _NCS variant allows non-constant syscall numbers but it is not
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possible to use more than four parameters. */
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#undef INTERNAL_SYSCALL
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#ifdef I386_USE_SYSENTER
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# ifdef SHARED
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# define INTERNAL_SYSCALL(name, err, nr, args...) \
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#define INTERNAL_SYSCALL_MAIN_0(name, err, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, err, 0, args)
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#define INTERNAL_SYSCALL_MAIN_1(name, err, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, err, 1, args)
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#define INTERNAL_SYSCALL_MAIN_2(name, err, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, err, 2, args)
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#define INTERNAL_SYSCALL_MAIN_3(name, err, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, err, 3, args)
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#define INTERNAL_SYSCALL_MAIN_4(name, err, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, err, 4, args)
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#define INTERNAL_SYSCALL_MAIN_5(name, err, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, err, 5, args)
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/* Each object using 6-argument inline syscalls must include a
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definition of __libc_do_syscall. */
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#define INTERNAL_SYSCALL_MAIN_6(name, err, arg1, arg2, arg3, \
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arg4, arg5, arg6) \
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struct libc_do_syscall_args _xv = \
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{ \
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(int) (arg1), \
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(int) (arg5), \
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(int) (arg6) \
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}; \
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asm volatile ( \
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"movl %1, %%eax\n\t" \
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"call __libc_do_syscall" \
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: "=a" (resultvar) \
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: "i" (__NR_##name), "c" (arg2), "d" (arg3), "S" (arg4), "D" (&_xv) \
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: "memory", "cc")
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#define INTERNAL_SYSCALL(name, err, nr, args...) \
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({ \
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register unsigned int resultvar; \
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INTERNAL_SYSCALL_MAIN_##nr (name, err, args); \
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(int) resultvar; })
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#ifdef I386_USE_SYSENTER
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# ifdef SHARED
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# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \
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EXTRAVAR_##nr \
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asm volatile ( \
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LOADARGS_##nr \
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@ -338,8 +380,7 @@ asm (".L__X'%ebx = 1\n\t"
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RESTOREARGS_##nr \
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: "=a" (resultvar) \
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: "i" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo)) \
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ASMFMT_##nr(args) : "memory", "cc"); \
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(int) resultvar; })
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ASMFMT_##nr(args) : "memory", "cc")
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# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
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({ \
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register unsigned int resultvar; \
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@ -353,9 +394,7 @@ asm (".L__X'%ebx = 1\n\t"
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ASMFMT_##nr(args) : "memory", "cc"); \
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(int) resultvar; })
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# else
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# define INTERNAL_SYSCALL(name, err, nr, args...) \
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({ \
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register unsigned int resultvar; \
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# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \
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EXTRAVAR_##nr \
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asm volatile ( \
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LOADARGS_##nr \
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@ -363,8 +402,7 @@ asm (".L__X'%ebx = 1\n\t"
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"call *_dl_sysinfo\n\t" \
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RESTOREARGS_##nr \
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: "=a" (resultvar) \
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: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \
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(int) resultvar; })
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: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc")
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# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
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({ \
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register unsigned int resultvar; \
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@ -378,9 +416,7 @@ asm (".L__X'%ebx = 1\n\t"
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(int) resultvar; })
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# endif
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#else
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# define INTERNAL_SYSCALL(name, err, nr, args...) \
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({ \
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register unsigned int resultvar; \
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# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \
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EXTRAVAR_##nr \
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asm volatile ( \
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LOADARGS_##nr \
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@ -388,8 +424,7 @@ asm (".L__X'%ebx = 1\n\t"
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"int $0x80\n\t" \
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RESTOREARGS_##nr \
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: "=a" (resultvar) \
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: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc"); \
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(int) resultvar; })
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: "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc")
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# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
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({ \
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register unsigned int resultvar; \
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