/* 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