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/* Cancellable system call stubs. Linux/PowerPC version.
Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Franz Sirl <Franz.Sirl-kernel@lauterbach.com>, 2003.
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, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
02110-1301 USA. */
#include <sysdep.h>
#include <tls.h>
#ifndef __ASSEMBLER__
# include <nptl/pthreadP.h>
#endif
#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.section ".text"; \
ENTRY (name) \
SINGLE_THREAD_P; \
bne- .Lpseudo_cancel; \
.type __##syscall_name##_nocancel,@function; \
.globl __##syscall_name##_nocancel; \
__##syscall_name##_nocancel: \
DO_CALL (SYS_ify (syscall_name)); \
PSEUDO_RET; \
.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
.Lpseudo_cancel: \
stwu 1,-48(1); \
cfi_adjust_cfa_offset (48); \
mflr 9; \
stw 9,52(1); \
cfi_offset (lr, 4); \
CGOTSETUP; \
DOCARGS_##args; /* save syscall args around CENABLE. */ \
CENABLE; \
stw 3,16(1); /* store CENABLE return value (MASK). */ \
UNDOCARGS_##args; /* restore syscall args. */ \
DO_CALL (SYS_ify (syscall_name)); \
mfcr 0; /* save CR/R3 around CDISABLE. */ \
stw 3,8(1); \
stw 0,12(1); \
lwz 3,16(1); /* pass MASK to CDISABLE. */ \
CDISABLE; \
lwz 4,52(1); \
lwz 0,12(1); /* restore CR/R3. */ \
lwz 3,8(1); \
CGOTRESTORE; \
mtlr 4; \
mtcr 0; \
addi 1,1,48;
# define DOCARGS_0
# define UNDOCARGS_0
# define DOCARGS_1 stw 3,20(1); DOCARGS_0
# define UNDOCARGS_1 lwz 3,20(1); UNDOCARGS_0
# define DOCARGS_2 stw 4,24(1); DOCARGS_1
# define UNDOCARGS_2 lwz 4,24(1); UNDOCARGS_1
# define DOCARGS_3 stw 5,28(1); DOCARGS_2
# define UNDOCARGS_3 lwz 5,28(1); UNDOCARGS_2
# define DOCARGS_4 stw 6,32(1); DOCARGS_3
# define UNDOCARGS_4 lwz 6,32(1); UNDOCARGS_3
# define DOCARGS_5 stw 7,36(1); DOCARGS_4
# define UNDOCARGS_5 lwz 7,36(1); UNDOCARGS_4
# define DOCARGS_6 stw 8,40(1); DOCARGS_5
# define UNDOCARGS_6 lwz 8,40(1); UNDOCARGS_5
# define CGOTSETUP
# define CGOTRESTORE
# ifdef IS_IN_libpthread
# define CENABLE bl __pthread_enable_asynccancel@local
# define CDISABLE bl __pthread_disable_asynccancel@local
# elif !defined NOT_IN_libc
# define CENABLE bl __libc_enable_asynccancel@local
# define CDISABLE bl __libc_disable_asynccancel@local
# elif defined IS_IN_librt
# define CENABLE bl JUMPTARGET(__librt_enable_asynccancel)
# define CDISABLE bl JUMPTARGET(__librt_disable_asynccancel)
# if defined HAVE_AS_REL16 && defined PIC
# undef CGOTSETUP
# define CGOTSETUP \
bcl 20,31,1f; \
1: stw 30,44(1); \
mflr 30; \
addis 30,30,_GLOBAL_OFFSET_TABLE-1b@ha; \
addi 30,30,_GLOBAL_OFFSET_TABLE-1b@l
# undef CGOTRESTORE
# define CGOTRESTORE \
lwz 30,44(1)
# endif
# else
# error Unsupported library
# endif
# ifndef __ASSEMBLER__
# define SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
# else
# define SINGLE_THREAD_P \
lwz 10,MULTIPLE_THREADS_OFFSET(2); \
cmpwi 10,0
# endif
#elif !defined __ASSEMBLER__
# define SINGLE_THREAD_P (1)
# define NO_CANCELLATION 1
#endif
#ifndef __ASSEMBLER__
# define RTLD_SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
#endif
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