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/* Copyright (C) 2010, 2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
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 <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) \
.text; \
ENTRY (name) \
SINGLE_THREAD_P; \
jne .Lpseudo_cancel; \
.type __##syscall_name##_nocancel,@function; \
.globl __##syscall_name##_nocancel; \
__##syscall_name##_nocancel: \
DO_CALL (syscall_name, args); \
cmp.l &-4095, %d0; \
jcc SYSCALL_ERROR_LABEL; \
rts; \
.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
.Lpseudo_cancel: \
CENABLE; \
DOCARGS_##args \
move.l %d0, -(%sp); /* Save result of CENABLE. */ \
cfi_adjust_cfa_offset (4); \
move.l &SYS_ify (syscall_name), %d0; \
trap &0; \
move.l %d0, %d2; \
CDISABLE; \
addq.l &4, %sp; /* Remove result of CENABLE from the stack. */ \
cfi_adjust_cfa_offset (-4); \
move.l %d2, %d0; \
UNDOCARGS_##args \
cmp.l &-4095, %d0; \
jcc SYSCALL_ERROR_LABEL
/* Note: we use D2 to save syscall's return value as D0 will be clobbered in
CDISABLE. */
# define DOCARGS_0 move.l %d2, -(%sp); \
cfi_adjust_cfa_offset (4); cfi_rel_offset (%d2, 0);
# define UNDOCARGS_0 move.l (%sp)+, %d2; \
cfi_adjust_cfa_offset (-4); cfi_restore (%d2);
# define DOCARGS_1 _DOCARGS_1 (4); DOCARGS_0
# define _DOCARGS_1(n) move.l n(%sp), %d1;
# define UNDOCARGS_1 UNDOCARGS_0
# define DOCARGS_2 _DOCARGS_2 (8)
# define _DOCARGS_2(n) DOCARGS_0 move.l n+4(%sp), %d2; _DOCARGS_1 (n)
# define UNDOCARGS_2 UNDOCARGS_0
/* TODO: We can optimize DOCARGS_{3, 4} by saving registers to a0 and a1
instead of pushing them on stack. */
# define DOCARGS_3 _DOCARGS_3 (12)
# define _DOCARGS_3(n) move.l %d3, -(%sp); \
cfi_adjust_cfa_offset (4); cfi_rel_offset (%d3, 0); \
move.l n+4(%sp), %d3; _DOCARGS_2 (n)
# define UNDOCARGS_3 UNDOCARGS_2 move.l (%sp)+, %d3; \
cfi_adjust_cfa_offset (-4); cfi_restore (%d3);
# define DOCARGS_4 _DOCARGS_4 (16)
# define _DOCARGS_4(n) move.l %d4, -(%sp); \
cfi_adjust_cfa_offset (4); cfi_rel_offset (%d4, 0); \
move.l n+4(%sp), %d4; _DOCARGS_3 (n)
# define UNDOCARGS_4 UNDOCARGS_3 move.l (%sp)+, %d4; \
cfi_adjust_cfa_offset (-4); cfi_restore (%d4);
# define DOCARGS_5 _DOCARGS_5 (20)
# define _DOCARGS_5(n) move.l %d5, %a1; cfi_register (%d5, a1); \
move.l n(%sp), %d5; _DOCARGS_4 (n-4)
# define UNDOCARGS_5 UNDOCARGS_4 move.l %a1, %d5; cfi_restore (%d5);
# define DOCARGS_6 _DOCARGS_6 (24)
# define _DOCARGS_6(n) move.l n(%sp), %a0; _DOCARGS_5 (n-4)
# define UNDOCARGS_6 UNDOCARGS_5
# ifdef PIC
# define PSEUDO_JMP(sym) jbsr sym ## @PLTPC
# else
# define PSEUDO_JMP(sym) jbsr sym
# endif
# ifdef IS_IN_libpthread
# define CENABLE PSEUDO_JMP (__pthread_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__pthread_disable_asynccancel)
# elif !defined NOT_IN_libc
# define CENABLE PSEUDO_JMP (__libc_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__libc_disable_asynccancel)
# elif defined IS_IN_librt
# define CENABLE PSEUDO_JMP (__librt_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__librt_disable_asynccancel)
# 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 \
PSEUDO_JMP (__m68k_read_tp); \
tst.l MULTIPLE_THREADS_OFFSET(%a0)
# 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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