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- /* 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 <pthreadP.h>
- #endif
- #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
- #ifdef __ASSEMBLER__
- #undef ret
- #define ret
- # 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; \
- rsubk r3,r3,r0; \
- rtsd r15,8; \
- addik r3,r0,-1; \
- 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; \
- rsubk r3,r3,r0; \
- rtsd r15,8; \
- addik r3,r0,-1; \
- 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 defined 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 !defined NOT_IN_libc
- # define CENABLE PSEUDO_JMP (__libc_enable_asynccancel)
- # define CDISABLE PSEUDO_JMP (__libc_disable_asynccancel)
- # define __local_multiple_threads __libc_multiple_threads
- # elif defined IS_IN_librt
- # define CENABLE PSEUDO_JMP (__librt_enable_asynccancel)
- # define CDISABLE PSEUDO_JMP (__librt_disable_asynccancel)
- # else
- # error Unsupported library
- # endif
- #define SINGLE_THREAD_P(reg) \
- lwi reg, r0, MULTIPLE_THREADS_OFFSET(reg)
- #else /* !__ASSEMBLER__ */
- # define SINGLE_THREAD_P \
- __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
- header.multiple_threads) == 0, 1)
- #endif /* __ASSEMBLER__ */
- #endif
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