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- /* Copyright (C) 2003, 2004, 2005, 2009 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; see the file COPYING.LIB. If
- not, see <http://www.gnu.org/licenses/>. */
- #include <tls.h>
- #include <sysdep.h>
- #ifndef __ASSEMBLER__
- # include <pthreadP.h>
- #endif
- #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
- /* NOTE: We do mark syscalls with unwind annotations, for the benefit of
- cancellation; but they're really only accurate at the point of the
- syscall. The ARM unwind directives are not rich enough without adding
- a custom personality function. */
- #ifdef __ASSEMBLER__
- #undef ret
- #define ret \
- CMP D0Re0, #-4095; \
- MOVLO PC, D1RtP; \
- MOV D1Ar1, D0Re0; \
- B SYSCALL_ERROR;
- #endif /* __ASSEMBLER__ */
- # undef PSEUDO
- # define PSEUDO(name, syscall_name, args) \
- .section ".text"; \
- .type ___##syscall_name##_nocancel,%function; \
- .globl ___##syscall_name##_nocancel; \
- ___##syscall_name##_nocancel: \
- cfi_startproc; \
- DO_CALL (syscall_name, args); \
- MOV PC, D1RtP; \
- cfi_endproc; \
- .size ___##syscall_name##_nocancel,.-___##syscall_name##_nocancel; \
- .globl _##name; \
- .type _##name, @function; \
- name##: \
- _##name##: \
- DOCARGS_##args; \
- SINGLE_THREAD_P; \
- UNDOCARGS_##args; \
- BNE .Lpseudo_cancel; \
- cfi_remember_state; \
- DO_CALL (syscall_name, 0); \
- ret \
- cfi_restore_state; \
- .Lpseudo_cancel: \
- MSETL [A0StP++], D0FrT, D0.5; \
- DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \
- CENABLE; \
- MOV D0FrT, D0Re0; /* put mask in safe place. */ \
- UNDOCARGS_##args; /* restore syscall args. */ \
- DO_CALL(syscall_name, 0); /* do the call. */ \
- MOV D0.5, D0Re0; /* save syscall return value. */ \
- MOV D1Ar1, D0FrT; /* get mask back. */ \
- CDISABLE; \
- MOV D0Re0, D0.5; /* retrieve return value. */ \
- GETL D0.5, D1.5, [--A0StP]; \
- GETL D0FrT, D1RtP, [--A0StP];
- # define DOCARGS_0
- # define UNDOCARGS_0
- # define DOCARGS_1 \
- SETL [A0StP++], D1Ar1, D0Ar2
- # define UNDOCARGS_1 \
- GETL D1Ar1, D0Ar2, [--A0StP]
- # define DOCARGS_2 DOCARGS_1
- # define UNDOCARGS_2 UNDOCARGS_2
- # define DOCARGS_3 \
- MSETL [A0StP++], D1Ar1, D1Ar3
- # define UNDOCARGS_3 \
- GETL D1Ar1, D0Ar2, [--A0StP]; \
- GETL D1Ar3, D0Ar4, [--A0StP]
- # define DOCARGS_4 DOCARGS_3
- # define UNDOCARGS_4 UNDOCARGS_3
- # define DOCARGS_5 \
- MSETL [A0StP++], D1Ar1, D1Ar3, D1Ar5
- # define UNDOCARGS_5 \
- GETL D1Ar1, D0Ar2, [--A0StP]; \
- GETL D1Ar3, D0Ar4, [--A0StP]; \
- GETL D1Ar5, D0Ar6, [--A0StP]
- # define DOCARGS_6 DOCARGS_5
- # define UNDOCARGS_6 UNDOCARGS_5
- # ifdef IS_IN_libpthread
- # define CENABLE CALLR D1RtP, ___pthread_enable_asynccancel@PLT
- # define CDISABLE CALLR D1RtP, ___pthread_disable_asynccancel@PLT
- # define __local_multiple_threads __pthread_multiple_threads
- # elif !defined NOT_IN_libc
- # define CENABLE CALLR D1RtP, ___libc_enable_asynccancel@PLT
- # define CDISABLE CALLR D1RtP, ___libc_disable_asynccancel@PLT
- # define __local_multiple_threads __libc_multiple_threads
- # elif defined IS_IN_librt
- # define CENABLE CALLR D1RtP, ___librt_enable_asynccancel@PLT
- # define CDISABLE CALLR D1RtP, ___librt_disable_asynccancel@PLT
- # else
- # error Unsupported library
- # endif
- #ifndef __ASSEMBLER__
- # define SINGLE_THREAD_P \
- likely(THREAD_GETMEM (THREAD_SELF, \
- header.multiple_threads) == 0)
- #else
- # define SINGLE_THREAD_P \
- SETL [A0StP++], D0FrT, D1RtP; \
- CALLR D1RtP, ___metag_load_tp@PLT; \
- SUB D0Re0, D0Re0, #TLS_PRE_TCB_SIZE; \
- GETD D0Re0, [D0Re0 + #MULTIPLE_THREADS_OFFSET]; \
- CMP D0Re0, #0; \
- GETL D0FrT, D1RtP, [--A0StP]
- #endif
- #elif !defined __ASSEMBLER__
- /* For rtld, et cetera. */
- # define SINGLE_THREAD_P 1
- # define NO_CANCELLATION 1
- #endif
- #ifndef __ASSEMBLER__
- # define RTLD_SINGLE_THREAD_P \
- likely(THREAD_GETMEM (THREAD_SELF, \
- header.multiple_threads) == 0)
- #endif
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