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