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/* Copyright (C) 2014 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. If not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <tls.h>
#ifndef __ASSEMBLER__
# include <pthreadP.h>
#endif
#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
ENTRY(__##syscall_name##_nocancel); \
L(pseudo_nocancel): \
DO_CALL(syscall_name); \
l.j L(pseudo_finish); \
l.nop; \
END(__##syscall_name##_nocancel); \
ENTRY(name); \
SINGLE_THREAD_P(r13); \
l.sfeq r13,r0; \
l.bnf L(pseudo_nocancel); \
l.nop; \
/* Reserve the same amount of stack space, effectivly disregarding \
* how many args we're supposed to push. This makes the code easier. */ \
l.addi r1,r1,-28; \
cfi_adjust_cfa_offset(28); \
PUSHARGS_##args; /* CENABLE is a function call, save args for syscall. */ \
CENABLE; \
l.sw 24(r1),r11; \
POPARGS_##args; \
DO_CALL(syscall_name); \
l.lwz r3,24(r1); /* pass return value from CENABLE to CDISABLE. */ \
l.sw 24(r1),r11; /* save syscall return value for after CDISABLE. */ \
CDISABLE; \
l.lwz r11,24(r1); /* restore syscall return value. */ \
cfi_adjust_cfa_offset(-28); \
l.addi r1,r1,28; \
L(pseudo_finish): \
/* if -4096 < ret < 0 holds, it's an error */ \
l.sfgeui r11,0xf001; \
l.bf L(pseudo_end); \
l.nop
# undef PSEUDO_END
# define PSEUDO_END(name) \
L(pseudo_end): \
l.j SYSCALL_ERROR_NAME; \
l.ori r3,r11,0; \
END(name)
# define PUSHARGS_0 /* nothing to do */
# define PUSHARGS_1 PUSHARGS_0 l.sw 0(r1),r3;
# define PUSHARGS_2 PUSHARGS_1 l.sw 4(r1),r4;
# define PUSHARGS_3 PUSHARGS_2 l.sw 8(r1),r5;
# define PUSHARGS_4 PUSHARGS_3 l.sw 12(r1),r6;
# define PUSHARGS_5 PUSHARGS_4 l.sw 16(r1),r7;
# define PUSHARGS_6 PUSHARGS_5 l.sw 20(r1),r8;
# define POPARGS_0 /* nothing to do */
# define POPARGS_1 POPARGS_0 l.lwz r3,0(r1);
# define POPARGS_2 POPARGS_1 l.lwz r4,4(r1);
# define POPARGS_3 POPARGS_2 l.lwz r5,8(r1);
# define POPARGS_4 POPARGS_3 l.lwz r6,12(r1);
# define POPARGS_5 POPARGS_4 l.lwz r7,16(r1);
# define POPARGS_6 POPARGS_5 l.lwz r8,20(r1);
# define PSEUDO_JMP(sym) l.jal sym; l.nop;
# ifdef IS_IN_libpthread
# define CENABLE PSEUDO_JMP (__pthread_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__pthread_disable_asynccancel)
# elif defined IS_IN_librt
# define CENABLE PSEUDO_JMP (__librt_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__librt_disable_asynccancel)
# else
# define CENABLE PSEUDO_JMP (__libc_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__libc_disable_asynccancel)
# endif
# ifndef __ASSEMBLER__
# define SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
# else
/* It's not super nice to have "r10" hardcoded here */
# define SINGLE_THREAD_P(reg) l.lwz reg, MULTIPLE_THREADS_OFFSET(r10)
#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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