mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
159 lines
7.0 KiB
C
159 lines
7.0 KiB
C
/* Copyright (C) 2014-2016 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 <sysdep.h>
|
|
#include <tls.h>
|
|
#ifndef __ASSEMBLER__
|
|
# include <nptl/pthreadP.h>
|
|
#endif
|
|
|
|
#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
|
|
|
|
# if !IS_IN (librt) || !defined(PIC)
|
|
# define AC_STACK_SIZE 16 /* space for r15, async_cancel arg and 2 temp words */
|
|
# define AC_SET_GOT /* empty */
|
|
# define AC_RESTORE_GOT /* empty */
|
|
# else
|
|
# define AC_STACK_SIZE 20 /* extra 4 bytes for r20 */
|
|
# define AC_SET_GOT \
|
|
swi r20, r1, AC_STACK_SIZE-4; \
|
|
mfs r20, rpc; \
|
|
addik r20, r20, _GLOBAL_OFFSET_TABLE_+8;
|
|
# define AC_RESTORE_GOT \
|
|
lwi r20, r1, AC_STACK_SIZE-4;
|
|
# endif
|
|
|
|
# undef PSEUDO
|
|
# define PSEUDO(name, syscall_name, args) \
|
|
.text; \
|
|
ENTRY (name) \
|
|
SINGLE_THREAD_P(r12); \
|
|
bnei r12, L(pseudo_cancel); \
|
|
.globl __##syscall_name##_nocancel; \
|
|
.type __##syscall_name##_nocancel,@function; \
|
|
__##syscall_name##_nocancel: \
|
|
DO_CALL (syscall_name, args); \
|
|
addik r4, r0, -4095; \
|
|
cmpu r4, r4, r3; \
|
|
bgei r4, SYSCALL_ERROR_LABEL; \
|
|
rtsd r15, 8; \
|
|
nop; \
|
|
.size __##syscall_name##_nocancel, .-__##syscall_name##_nocancel; \
|
|
L(pseudo_cancel): \
|
|
addik r1, r1, -AC_STACK_SIZE; \
|
|
swi r15, r1, 0; \
|
|
AC_SET_GOT \
|
|
DOCARGS_##args \
|
|
CENABLE; \
|
|
swi r3, r1, 8; \
|
|
UNDOCARGS_##args \
|
|
DO_CALL (syscall_name, args); \
|
|
swi r3, r1, 12; \
|
|
lwi r5, r1, 8; \
|
|
CDISABLE; \
|
|
lwi r3, r1, 12; \
|
|
lwi r15, r1, 0; \
|
|
AC_RESTORE_GOT \
|
|
addik r1, r1, AC_STACK_SIZE; \
|
|
addik r4, r0, -4095; \
|
|
cmpu r4, r4, r3; \
|
|
bgei r4, SYSCALL_ERROR_LABEL; \
|
|
rtsd r15, 8; \
|
|
nop;
|
|
|
|
/*
|
|
* Macros to save/restore syscall arguments across CENABLE
|
|
* The arguments are saved into the caller's stack (original r1 + 4)
|
|
*/
|
|
|
|
# define DOCARGS_0
|
|
# define DOCARGS_1 swi r5, r1, AC_STACK_SIZE + 4;
|
|
# define DOCARGS_2 swi r6, r1, AC_STACK_SIZE + 8; DOCARGS_1
|
|
# define DOCARGS_3 swi r7, r1, AC_STACK_SIZE + 12; DOCARGS_2
|
|
# define DOCARGS_4 swi r8, r1, AC_STACK_SIZE + 16; DOCARGS_3
|
|
# define DOCARGS_5 swi r9, r1, AC_STACK_SIZE + 20; DOCARGS_4
|
|
# define DOCARGS_6 swi r10, r1, AC_STACK_SIZE + 24; DOCARGS_5
|
|
|
|
# define UNDOCARGS_0
|
|
# define UNDOCARGS_1 lwi r5, r1, AC_STACK_SIZE + 4;
|
|
# define UNDOCARGS_2 UNDOCARGS_1 lwi r6, r1, AC_STACK_SIZE + 8;
|
|
# define UNDOCARGS_3 UNDOCARGS_2 lwi r7, r1, AC_STACK_SIZE + 12;
|
|
# define UNDOCARGS_4 UNDOCARGS_3 lwi r8, r1, AC_STACK_SIZE + 16;
|
|
# define UNDOCARGS_5 UNDOCARGS_4 lwi r9, r1, AC_STACK_SIZE + 20;
|
|
# define UNDOCARGS_6 UNDOCARGS_5 lwi r10, r1, AC_STACK_SIZE + 24;
|
|
|
|
# ifdef PIC
|
|
# define PSEUDO_JMP(sym) brlid r15, sym##@PLTPC; addk r0, r0, r0
|
|
# else
|
|
# define PSEUDO_JMP(sym) brlid r15, sym; addk r0, r0, r0
|
|
# endif
|
|
|
|
# if IS_IN (libpthread)
|
|
# define CENABLE PSEUDO_JMP (__pthread_enable_asynccancel)
|
|
# define CDISABLE PSEUDO_JMP (__pthread_disable_asynccancel)
|
|
# define __local_multiple_threads __pthread_multiple_threads
|
|
# elif IS_IN (libc)
|
|
# define CENABLE PSEUDO_JMP (__libc_enable_asynccancel)
|
|
# define CDISABLE PSEUDO_JMP (__libc_disable_asynccancel)
|
|
# define __local_multiple_threads __libc_multiple_threads
|
|
# elif IS_IN (librt)
|
|
# define CENABLE PSEUDO_JMP (__librt_enable_asynccancel)
|
|
# define CDISABLE PSEUDO_JMP (__librt_disable_asynccancel)
|
|
# else
|
|
# error Unsupported library
|
|
# endif
|
|
|
|
|
|
# if IS_IN (libpthread) || IS_IN (libc)
|
|
# ifndef __ASSEMBLER__
|
|
extern int __local_multiple_threads attribute_hidden;
|
|
# define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
|
|
# else
|
|
# if !defined PIC
|
|
# define SINGLE_THREAD_P(reg) lwi reg, r0, __local_multiple_threads;
|
|
# else
|
|
# define SINGLE_THREAD_P(reg) \
|
|
mfs reg, rpc; \
|
|
addik reg, reg, _GLOBAL_OFFSET_TABLE_+8; \
|
|
lwi reg, reg, __local_multiple_threads@GOT; \
|
|
lwi reg, reg, 0;
|
|
# endif
|
|
# endif
|
|
# else
|
|
# ifndef __ASSEMBLER__
|
|
# define SINGLE_THREAD_P \
|
|
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
|
|
header.multiple_threads) == 0, 1)
|
|
# else
|
|
# define SINGLE_THREAD_P(reg) \
|
|
lwi reg, r0, MULTIPLE_THREADS_OFFSET(reg)
|
|
# endif
|
|
# endif
|
|
|
|
#elif !defined __ASSEMBLER__
|
|
|
|
# define SINGLE_THREAD_P (1)
|
|
# define NO_CANCELLATION (1)
|
|
|
|
#endif
|
|
|
|
#ifndef __ASSEMBLER__
|
|
# define RTLD_SINGLE_THREAD_P \
|
|
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
|
|
header.multiple_threads) == 0, 1)
|
|
#endif
|