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/* Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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 <asm/unistd.h>
#include <sysdeps/tile/sysdep.h>
#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
#include <sys/syscall.h>
#undef SYS_ify
#define SYS_ify(syscall_name) __NR_##syscall_name
#ifdef __ASSEMBLER__
/* The actual implementation of doing a syscall. */
#define DO_CALL(syscall_name, args) \
moveli TREG_SYSCALL_NR_NAME, SYS_ify(syscall_name); \
swint1
/* TILE Linux returns the result in r0 (or a negative errno).
The kernel "owns" the code to decide if a given value is an error,
and puts errno in r1 if so, or otherwise zero. */
#define PSEUDO(name, syscall_name, args) \
ENTRY (name); \
DO_CALL(syscall_name, args); \
BNEZ r1, 0f
#define ret jrp lr
#ifndef PIC
/* For static code, on error jump to __syscall_error directly. */
# define SYSCALL_ERROR_NAME __syscall_error
#elif !defined NOT_IN_libc || defined IS_IN_libpthread
/* Use the internal name for libc/libpthread shared objects. */
# define SYSCALL_ERROR_NAME __GI___syscall_error
#else
/* Otherwise, on error do a full PLT jump. */
# define SYSCALL_ERROR_NAME plt(__syscall_error)
#endif
#define PSEUDO_END(name) \
0: \
j SYSCALL_ERROR_NAME; \
END (name)
#define PSEUDO_NOERRNO(name, syscall_name, args) \
ENTRY (name); \
DO_CALL(syscall_name, args)
#define ret_NOERRNO jrp lr
#define PSEUDO_END_NOERRNO(name) \
END (name)
/* Convenience wrappers. */
#define SYSCALL__(name, args) PSEUDO (__##name, name, args)
#define SYSCALL(name, args) PSEUDO (name, name, args)
#else /* not __ASSEMBLER__ */
#include <errno.h>
/* Define a macro which expands inline into the wrapper code for a system
call. */
# undef INLINE_SYSCALL
# define INLINE_SYSCALL(name, nr, args...) \
({ \
INTERNAL_SYSCALL_DECL (err); \
unsigned long val = INTERNAL_SYSCALL (name, err, nr, args); \
if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (val, err), 0)) \
{ \
__set_errno (INTERNAL_SYSCALL_ERRNO (val, err)); \
val = -1; \
} \
(long) val; })
#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, err, nr, args...) \
internal_syscall##nr (SYS_ify (name), err, args)
#undef INTERNAL_SYSCALL_NCS
#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
internal_syscall##nr (number, err, args)
#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) int err
#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err) ({ (void) (val); (err) != 0; })
#undef INTERNAL_SYSCALL_ERRNO
#define INTERNAL_SYSCALL_ERRNO(val, err) ({ (void) (val); (err); })
#define internal_syscall0(num, err, dummy...) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall1(num, err, arg0) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall2(num, err, arg0, arg1) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall3(num, err, arg0, arg1, arg2) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall4(num, err, arg0, arg1, arg2, arg3) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
"R03" (arg3) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall5(num, err, arg0, arg1, arg2, arg3, arg4) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
"R03" (arg3), "R04" (arg4) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall6(num, err, arg0, arg1, arg2, arg3, arg4, arg5) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
"R03" (arg3), "R04" (arg4), "R05" (arg5) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#undef __SYSCALL_CLOBBERS
#define __SYSCALL_CLOBBERS \
"r6", "r7", \
"r8", "r9", "r11", "r12", "r13", "r14", "r15", \
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
"r24", "r25", "r26", "r27", "r28", "r29", "memory"
/* gcc doesn't seem to allow an input operand to be clobbered, so we
fake it with dummy outputs. */
#define __SYSCALL_CLOBBER_DECLS \
_clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10
#define __SYSCALL_CLOBBER_OUTPUTS \
"=R02" (_clobber_r2), "=R03" (_clobber_r3), "=R04" (_clobber_r4), \
"=R05" (_clobber_r5), "=R10" (_clobber_r10)
#endif /* not __ASSEMBLER__ */
/* Pointer mangling support. */
#if defined NOT_IN_libc && defined IS_IN_rtld
/* We cannot use the thread descriptor because in ld.so we use setjmp
earlier than the descriptor is initialized. */
#else
# ifdef __ASSEMBLER__
# define PTR_MANGLE(reg, tmpreg) \
ADDLI_PTR tmpreg, pt, POINTER_GUARD; \
LD tmpreg, tmpreg; \
xor reg, tmpreg, reg
# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
# else
# define PTR_MANGLE(var) \
(var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
# define PTR_DEMANGLE(var) PTR_MANGLE (var)
# endif
#endif
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