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cd1530839c
* sysdeps/hppa/nptl/tls.h: Fix comment. * sysdeps/unix/sysv/linux/hppa/bits/fcntl.h: Fix comment format. [__USE_GNU] (O_CLOEXEC): Define. * sysdeps/unix/sysv/linux/hppa/nptl/sysdep-cancel.h: Issue error if the library is unsupported. [ASSEMBLER && IS_IN_librt]: Define CENABLE, CDISABLE, and __local_multiple_threads.
227 lines
8.3 KiB
C
227 lines
8.3 KiB
C
/* Copyright (C) 2005 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, 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 <sysdeps/generic/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 !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
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# ifndef NO_ERROR
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# define NO_ERROR -0x1000
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# endif
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/* The syscall cancellation mechanism requires userspace
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assistance, the following code does roughly this:
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do arguments (read arg5 and arg6 to registers)
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setup frame
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check if there are threads, yes jump to pseudo_cancel
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unthreaded:
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syscall
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check syscall return (jump to pre_end)
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set errno
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set return to -1
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(jump to pre_end)
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pseudo_cancel:
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cenable
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syscall
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cdisable
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check syscall return (jump to pre_end)
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set errno
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set return to -1
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pre_end
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restore stack
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It is expected that 'ret' and 'END' macros will
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append an 'undo arguments' and 'return' to the
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this PSEUDO macro. */
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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ENTRY (name) \
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DOARGS_##args ASM_LINE_SEP \
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stwm TREG, 64(%sp) ASM_LINE_SEP \
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stw %sp, -4(%sp) ASM_LINE_SEP \
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stw %r19, -32(%sp) ASM_LINE_SEP \
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/* Done setting up frame, continue... */ ASM_LINE_SEP \
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SINGLE_THREAD_P ASM_LINE_SEP \
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cmpib,<>,n 0,%ret0,L(pseudo_cancel) ASM_LINE_SEP \
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L(unthreaded): ASM_LINE_SEP \
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/* Save r19 */ ASM_LINE_SEP \
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SAVE_PIC(TREG) ASM_LINE_SEP \
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/* Do syscall, delay loads # */ ASM_LINE_SEP \
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ble 0x100(%sr2,%r0) ASM_LINE_SEP \
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ldi SYS_ify (syscall_name), %r20 /* delay */ ASM_LINE_SEP \
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ldi NO_ERROR,%r1 ASM_LINE_SEP \
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cmpb,>>=,n %r1,%ret0,L(pre_end) ASM_LINE_SEP \
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/* Restore r19 from TREG */ ASM_LINE_SEP \
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LOAD_PIC(TREG) /* delay */ ASM_LINE_SEP \
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SYSCALL_ERROR_HANDLER ASM_LINE_SEP \
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/* Use TREG for temp storage */ ASM_LINE_SEP \
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copy %ret0, TREG /* delay */ ASM_LINE_SEP \
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/* OPTIMIZE: Don't reload r19 */ ASM_LINE_SEP \
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/* do a -1*syscall_ret0 */ ASM_LINE_SEP \
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sub %r0, TREG, TREG ASM_LINE_SEP \
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/* Store into errno location */ ASM_LINE_SEP \
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stw TREG, 0(%sr0,%ret0) ASM_LINE_SEP \
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b L(pre_end) ASM_LINE_SEP \
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/* return -1 as error */ ASM_LINE_SEP \
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ldi -1, %ret0 /* delay */ ASM_LINE_SEP \
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L(pseudo_cancel): ASM_LINE_SEP \
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PUSHARGS_##args /* Save args */ ASM_LINE_SEP \
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/* Save r19 into TREG */ ASM_LINE_SEP \
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CENABLE /* FUNC CALL */ ASM_LINE_SEP \
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SAVE_PIC(TREG) /* delay */ ASM_LINE_SEP \
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/* restore syscall args */ ASM_LINE_SEP \
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POPARGS_##args ASM_LINE_SEP \
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/* save mask from cenable (use stub rp slot) */ ASM_LINE_SEP \
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stw %ret0, -24(%sp) ASM_LINE_SEP \
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/* ... SYSCALL ... */ ASM_LINE_SEP \
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ble 0x100(%sr2,%r0) ASM_LINE_SEP \
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ldi SYS_ify (syscall_name), %r20 /* delay */ ASM_LINE_SEP \
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/* ............... */ ASM_LINE_SEP \
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LOAD_PIC(TREG) ASM_LINE_SEP \
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/* pass mask as arg0 to cdisable */ ASM_LINE_SEP \
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ldw -24(%sp), %r26 ASM_LINE_SEP \
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CDISABLE ASM_LINE_SEP \
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stw %ret0, -24(%sp) /* delay */ ASM_LINE_SEP \
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/* Restore syscall return */ ASM_LINE_SEP \
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ldw -24(%sp), %ret0 ASM_LINE_SEP \
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/* compare error */ ASM_LINE_SEP \
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ldi NO_ERROR,%r1 ASM_LINE_SEP \
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/* branch if no error */ ASM_LINE_SEP \
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cmpb,>>=,n %r1,%ret0,L(pre_end) ASM_LINE_SEP \
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LOAD_PIC(TREG) /* cond. nullify */ ASM_LINE_SEP \
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copy %ret0, TREG /* save syscall return */ ASM_LINE_SEP \
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SYSCALL_ERROR_HANDLER ASM_LINE_SEP \
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/* make syscall res value positive */ ASM_LINE_SEP \
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sub %r0, TREG, TREG /* delay */ ASM_LINE_SEP \
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/* No need to LOAD_PIC */ ASM_LINE_SEP \
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/* store into errno location */ ASM_LINE_SEP \
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stw TREG, 0(%sr0,%ret0) ASM_LINE_SEP \
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/* return -1 */ ASM_LINE_SEP \
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ldi -1, %ret0 ASM_LINE_SEP \
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L(pre_end): ASM_LINE_SEP \
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/* No need to LOAD_PIC */ ASM_LINE_SEP \
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/* Undo frame */ ASM_LINE_SEP \
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ldwm -64(%sp),TREG ASM_LINE_SEP \
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/* Restore rp before exit */ ASM_LINE_SEP \
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ldw -20(%sp), %rp ASM_LINE_SEP
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/* Save arguments into our frame */
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# define PUSHARGS_0 /* nothing to do */
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# define PUSHARGS_1 PUSHARGS_0 stw %r26, -36(%sr0,%sp) ASM_LINE_SEP
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# define PUSHARGS_2 PUSHARGS_1 stw %r25, -40(%sr0,%sp) ASM_LINE_SEP
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# define PUSHARGS_3 PUSHARGS_2 stw %r24, -44(%sr0,%sp) ASM_LINE_SEP
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# define PUSHARGS_4 PUSHARGS_3 stw %r23, -48(%sr0,%sp) ASM_LINE_SEP
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# define PUSHARGS_5 PUSHARGS_4 stw %r22, -52(%sr0,%sp) ASM_LINE_SEP
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# define PUSHARGS_6 PUSHARGS_5 stw %r21, -56(%sr0,%sp) ASM_LINE_SEP
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/* Bring them back from the stack */
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# define POPARGS_0 /* nothing to do */
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# define POPARGS_1 POPARGS_0 ldw -36(%sr0,%sp), %r26 ASM_LINE_SEP
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# define POPARGS_2 POPARGS_1 ldw -40(%sr0,%sp), %r25 ASM_LINE_SEP
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# define POPARGS_3 POPARGS_2 ldw -44(%sr0,%sp), %r24 ASM_LINE_SEP
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# define POPARGS_4 POPARGS_3 ldw -48(%sr0,%sp), %r23 ASM_LINE_SEP
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# define POPARGS_5 POPARGS_4 ldw -52(%sr0,%sp), %r22 ASM_LINE_SEP
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# define POPARGS_6 POPARGS_5 ldw -56(%sr0,%sp), %r21 ASM_LINE_SEP
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# ifdef IS_IN_libpthread
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# ifdef PIC
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# define CENABLE .import __pthread_enable_asynccancel,code ASM_LINE_SEP \
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bl __pthread_enable_asynccancel,%r2 ASM_LINE_SEP
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# define CDISABLE .import __pthread_disable_asynccancel,code ASM_LINE_SEP \
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bl __pthread_disable_asynccancel,%r2 ASM_LINE_SEP
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# else
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# define CENABLE .import __pthread_enable_asynccancel,code ASM_LINE_SEP \
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bl __pthread_enable_asynccancel,%r2 ASM_LINE_SEP
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# define CDISABLE .import __pthread_disable_asynccancel,code ASM_LINE_SEP \
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bl __pthread_disable_asynccancel,%r2 ASM_LINE_SEP
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# endif
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# elif !defined NOT_IN_libc
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# ifdef PIC
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# define CENABLE .import __libc_enable_asynccancel,code ASM_LINE_SEP \
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bl __libc_enable_asynccancel,%r2 ASM_LINE_SEP
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# define CDISABLE .import __libc_disable_asynccancel,code ASM_LINE_SEP \
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bl __libc_disable_asynccancel,%r2 ASM_LINE_SEP
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# else
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# define CENABLE .import __libc_enable_asynccancel,code ASM_LINE_SEP \
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bl __libc_enable_asynccancel,%r2 ASM_LINE_SEP
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# define CDISABLE .import __libc_disable_asynccancel,code ASM_LINE_SEP \
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bl __libc_disable_asynccancel,%r2 ASM_LINE_SEP
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# endif
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# elif defined IS_IN_librt
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# ifdef PIC
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# define CENABLE .import __librt_enable_asynccancel,code ASM_LINE_SEP \
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bl __librt_enable_asynccancel,%r2 ASM_LINE_SEP
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# define CDISABLE .import __librt_disable_asynccancel,code ASM_LINE_SEP \
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bl __librt_disable_asynccancel,%r2 ASM_LINE_SEP
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# else
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# define CENABLE .import __librt_enable_asynccancel,code ASM_LINE_SEP \
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bl __librt_enable_asynccancel,%r2 ASM_LINE_SEP
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# define CDISABLE .import __librt_disable_asynccancel,code ASM_LINE_SEP \
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bl __librt_disable_asynccancel,%r2 ASM_LINE_SEP
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# endif
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# else
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# error Unsupported library
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# endif
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# ifdef IS_IN_libpthread
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# define __local_multiple_threads __pthread_multiple_threads
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# elif !defined NOT_IN_libc
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# define __local_multiple_threads __libc_multiple_threads
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# elif IS_IN_librt
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# define __local_multiple_threads __librt_multiple_threads
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# else
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# error Unsupported library
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# endif
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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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/* Read the value of header.multiple_threads from the thread pointer */
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# define SINGLE_THREAD_P \
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mfctl %cr27, %ret0 ASM_LINE_SEP \
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ldw MULTIPLE_THREADS_THREAD_OFFSET(%sr0,%ret0),%ret0 ASM_LINE_SEP
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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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# define NO_CANCELLATION 1
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#endif
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/* !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt */
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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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