2003-03-17 11:22:52 +00:00
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/* Cancellable system call stubs. Linux/PowerPC version.
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Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Franz Sirl <Franz.Sirl-kernel@lauterbach.com>, 2003.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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Update.
2003-06-15 Ulrich Drepper <drepper@redhat.com>
Fix cancellation point handling wrt exception based cleanup.
* io/Makefile: Compile fcntl.c, poll.c, and lockf.c with exceptions.
* misc/Makefile: Compile pselect.c, readv.c, writev.c, and usleep.c
with exceptions.
* posix/Makefile: Compile pread.c, pread64.c, pwrite.c, pwrite64.c,
sleep.c, wait.c, waitid.c, and waitpid.c with exceptions.
* rt/Makefile: Compile aio_suspend.c and clock_nanosleep.c with
exceptions.
* signal/Makefile: Compile sigpause.c, sigsuspend.c, sigtimedwait.c,
sigwait.c, and sigwaitinfo.c with exceptions.
* stdlib/Makefile: Compile system.c with exceptions.
* sysvipc/Makefile: Compile msgrcv.c and msgsnd.c with exceptions.
* termios/Makefile: Compile tcdrain.c with exceptions.
* sysdeps/generic/lockf.c: Add comment explaining the cancellation
situation.
* sysdeps/generic/pselect.c: Likewise.
* sysdeps/posix/sigpause.c: Likewise.
* sysdeps/posix/system.c: Likewise.
* sysdeps/posix/waitid.c: Likewise.
* sysdeps/unix/sysv/linux/sleep.c: Likewise.
* sysdeps/unix/sysv/linux/usleep.c: Likewise.
* sysdeps/unix/sysv/linux/i386/sysdep.h: Major rewrite of
INTERNAL_SYSCALL to not use push inside asm statement so that
unwind info is correct around the syscall.
* sysdeps/unix/clock_nanosleep.c: Add cancellation support.
* sysdeps/unix/sysv/linux/clock_nanosleep.c: Likewise.
2003-06-15 21:22:26 +00:00
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#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
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2003-03-17 11:22:52 +00:00
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (name) \
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2003-07-11 22:50:16 +00:00
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cfi_startproc; \
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2003-03-17 11:22:52 +00:00
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SINGLE_THREAD_P; \
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bne- .Lpseudo_cancel; \
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DO_CALL (SYS_ify (syscall_name)); \
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PSEUDO_RET; \
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.Lpseudo_cancel: \
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stwu 1,-48(1); \
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2003-07-11 22:50:16 +00:00
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cfi_adjust_cfa_offset (48); \
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2003-03-17 11:22:52 +00:00
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mflr 9; \
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stw 9,52(1); \
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2003-07-11 22:50:16 +00:00
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cfi_offset (lr, 4); \
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2003-03-17 11:22:52 +00:00
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DOCARGS_##args; /* save syscall args around CENABLE. */ \
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CENABLE; \
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stw 3,16(1); /* store CENABLE return value (MASK). */ \
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UNDOCARGS_##args; /* restore syscall args. */ \
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DO_CALL (SYS_ify (syscall_name)); \
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mfcr 0; /* save CR/R3 around CDISABLE. */ \
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stw 3,8(1); \
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stw 0,12(1); \
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lwz 3,16(1); /* pass MASK to CDISABLE. */ \
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CDISABLE; \
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lwz 4,52(1); \
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lwz 0,12(1); /* restore CR/R3. */ \
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lwz 3,8(1); \
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mtlr 4; \
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mtcr 0; \
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2003-07-11 22:50:16 +00:00
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addi 1,1,48; \
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cfi_endproc;
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2003-03-17 11:22:52 +00:00
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# define DOCARGS_0
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# define UNDOCARGS_0
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# define DOCARGS_1 stw 3,20(1); DOCARGS_0
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# define UNDOCARGS_1 lwz 3,20(1); UNDOCARGS_0
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# define DOCARGS_2 stw 4,24(1); DOCARGS_1
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# define UNDOCARGS_2 lwz 4,24(1); UNDOCARGS_1
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# define DOCARGS_3 stw 5,28(1); DOCARGS_2
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# define UNDOCARGS_3 lwz 5,28(1); UNDOCARGS_2
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# define DOCARGS_4 stw 6,32(1); DOCARGS_3
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# define UNDOCARGS_4 lwz 6,32(1); UNDOCARGS_3
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# define DOCARGS_5 stw 7,36(1); DOCARGS_4
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# define UNDOCARGS_5 lwz 7,36(1); UNDOCARGS_4
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# define DOCARGS_6 stw 8,40(1); DOCARGS_5
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# define UNDOCARGS_6 lwz 8,40(1); UNDOCARGS_5
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# ifdef IS_IN_libpthread
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# define CENABLE bl JUMPTARGET(__pthread_enable_asynccancel)
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# define CDISABLE bl JUMPTARGET(__pthread_disable_asynccancel)
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2003-06-17 08:58:31 +00:00
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# elif !defined NOT_IN_libc
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2003-03-17 11:22:52 +00:00
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# define CENABLE bl JUMPTARGET(__libc_enable_asynccancel)
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# define CDISABLE bl JUMPTARGET(__libc_disable_asynccancel)
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2003-06-17 08:58:31 +00:00
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# elif defined IS_IN_librt
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# define CENABLE bl JUMPTARGET(__librt_enable_asynccancel)
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# define CDISABLE bl JUMPTARGET(__librt_disable_asynccancel)
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# else
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# error Unsupported library
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2003-03-17 11:22:52 +00:00
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# endif
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# ifndef __ASSEMBLER__
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# define SINGLE_THREAD_P \
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2003-04-25 22:28:13 +00:00
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__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
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header.multiple_threads) == 0, 1)
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2003-03-17 11:22:52 +00:00
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# else
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# define SINGLE_THREAD_P \
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lwz 10,MULTIPLE_THREADS_OFFSET(2); \
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cmpwi 10,0
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# endif
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#elif !defined __ASSEMBLER__
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/* This code should never be used but we define it anyhow. */
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# define SINGLE_THREAD_P (1)
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#endif
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