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/* Assembler macros for Nios II.
Copyright (C) 2000-2020 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
<https://www.gnu.org/licenses/>. */
#ifndef _LINUX_NIOS2_SYSDEP_H
#define _LINUX_NIOS2_SYSDEP_H 1
#include <sysdeps/unix/sysdep.h>
#include <sysdeps/nios2/sysdep.h>
#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
/* For RTLD_PRIVATE_ERRNO. */
#include <dl-sysdep.h>
#include <tls.h>
/* For Linux we can use the system call table in the header file
/usr/include/asm/unistd.h
of the kernel. But these symbols do not follow the SYS_* syntax
so we have to redefine the `SYS_ify' macro here. */
#undef SYS_ify
#define SYS_ify(syscall_name) __NR_##syscall_name
#ifdef __ASSEMBLER__
#define SYSCALL_ERROR_LABEL __local_syscall_error
#undef PSEUDO
#define PSEUDO(name, syscall_name, args) \
ENTRY (name) \
DO_CALL (syscall_name, args) \
bne r7, zero, SYSCALL_ERROR_LABEL; \
#undef PSEUDO_END
#define PSEUDO_END(name) \
SYSCALL_ERROR_HANDLER \
END (name)
#undef PSEUDO_NOERRNO
#define PSEUDO_NOERRNO(name, syscall_name, args) \
ENTRY (name) \
DO_CALL (syscall_name, args)
#undef PSEUDO_END_NOERRNO
#define PSEUDO_END_NOERRNO(name) \
END (name)
#undef ret_NOERRNO
#define ret_NOERRNO ret
#undef DO_CALL
#define DO_CALL(syscall_name, args) \
DOARGS_##args \
movi r2, SYS_ify(syscall_name); \
trap;
#if defined(__PIC__) || defined(PIC)
# if RTLD_PRIVATE_ERRNO
# define SYSCALL_ERROR_HANDLER \
SYSCALL_ERROR_LABEL: \
nextpc r3; \
1: \
movhi r8, %hiadj(rtld_errno - 1b); \
addi r8, r8, %lo(rtld_errno - 1b); \
add r3, r3, r8; \
stw r2, 0(r3); \
movi r2, -1; \
ret;
# else
# if IS_IN (libc)
# define SYSCALL_ERROR_ERRNO __libc_errno
# else
# define SYSCALL_ERROR_ERRNO errno
# endif
# define SYSCALL_ERROR_HANDLER \
SYSCALL_ERROR_LABEL: \
nextpc r3; \
1: \
movhi r8, %hiadj(_gp_got - 1b); \
addi r8, r8, %lo(_gp_got - 1b); \
add r3, r3, r8; \
ldw r3, %tls_ie(SYSCALL_ERROR_ERRNO)(r3); \
add r3, r23, r3; \
stw r2, 0(r3); \
movi r2, -1; \
ret;
# endif
#else
/* We can use a single error handler in the static library. */
#define SYSCALL_ERROR_HANDLER \
SYSCALL_ERROR_LABEL: \
jmpi __syscall_error;
#endif
#define DOARGS_0 /* nothing */
#define DOARGS_1 /* nothing */
#define DOARGS_2 /* nothing */
#define DOARGS_3 /* nothing */
#define DOARGS_4 /* nothing */
#define DOARGS_5 ldw r8, 0(sp);
#define DOARGS_6 ldw r9, 4(sp); ldw r8, 0(sp);
/* The function has to return the error code. */
#undef PSEUDO_ERRVAL
#define PSEUDO_ERRVAL(name, syscall_name, args) \
ENTRY (name) \
DO_CALL (syscall_name, args)
#undef PSEUDO_END_ERRVAL
#define PSEUDO_END_ERRVAL(name) \
END (name)
#define ret_ERRVAL ret
#else /* __ASSEMBLER__ */
/* In order to get __set_errno() definition in INLINE_SYSCALL. */
#include <errno.h>
/* Previously Nios2 used the generic version without the libc_hidden_def
which lead in a non existent __send symbol in libc.so. */
# undef HAVE_INTERNAL_SEND_SYMBOL
/* Define a macro which expands into the inline wrapper code for a system
call. */
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
({ INTERNAL_SYSCALL_DECL(err); \
unsigned int result_var = INTERNAL_SYSCALL (name, err, nr, args); \
if ( INTERNAL_SYSCALL_ERROR_P (result_var, err) ) \
{ \
__set_errno (INTERNAL_SYSCALL_ERRNO (result_var, err)); \
result_var = -1L; \
} \
(int) result_var; })
#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) unsigned int err __attribute__((unused))
#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err) ((void) (val), (unsigned int) (err))
#undef INTERNAL_SYSCALL_ERRNO
#define INTERNAL_SYSCALL_ERRNO(val, err) ((void) (err), val)
#undef INTERNAL_SYSCALL_RAW
#define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \
({ unsigned int _sys_result; \
{ \
/* Load argument values in temporary variables
to perform side effects like function calls
before the call-used registers are set. */ \
LOAD_ARGS_##nr (args) \
LOAD_REGS_##nr \
register int _r2 asm ("r2") = (int)(name); \
register int _err asm ("r7"); \
asm volatile ("trap" \
: "+r" (_r2), "=r" (_err) \
: ASM_ARGS_##nr \
: __SYSCALL_CLOBBERS); \
_sys_result = _r2; \
err = _err; \
} \
(int) _sys_result; })
#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, err, nr, args...) \
INTERNAL_SYSCALL_RAW(SYS_ify(name), err, nr, args)
#undef INTERNAL_SYSCALL_NCS
#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
INTERNAL_SYSCALL_RAW(number, err, nr, args)
#define LOAD_ARGS_0()
#define LOAD_REGS_0
#define ASM_ARGS_0
#define LOAD_ARGS_1(a1) \
LOAD_ARGS_0 () \
int __arg1 = (int) (a1);
#define LOAD_REGS_1 \
register int _r4 asm ("r4") = __arg1; \
LOAD_REGS_0
#define ASM_ARGS_1 "r" (_r4)
#define LOAD_ARGS_2(a1, a2) \
LOAD_ARGS_1 (a1) \
int __arg2 = (int) (a2);
#define LOAD_REGS_2 \
register int _r5 asm ("r5") = __arg2; \
LOAD_REGS_1
#define ASM_ARGS_2 ASM_ARGS_1, "r" (_r5)
#define LOAD_ARGS_3(a1, a2, a3) \
LOAD_ARGS_2 (a1, a2) \
int __arg3 = (int) (a3);
#define LOAD_REGS_3 \
register int _r6 asm ("r6") = __arg3; \
LOAD_REGS_2
#define ASM_ARGS_3 ASM_ARGS_2, "r" (_r6)
#define LOAD_ARGS_4(a1, a2, a3, a4) \
LOAD_ARGS_3 (a1, a2, a3) \
int __arg4 = (int) (a4);
#define LOAD_REGS_4 \
register int _r7 asm ("r7") = __arg4; \
LOAD_REGS_3
#define ASM_ARGS_4 ASM_ARGS_3, "r" (_r7)
#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
LOAD_ARGS_4 (a1, a2, a3, a4) \
int __arg5 = (int) (a5);
#define LOAD_REGS_5 \
register int _r8 asm ("r8") = __arg5; \
LOAD_REGS_4
#define ASM_ARGS_5 ASM_ARGS_4, "r" (_r8)
#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
LOAD_ARGS_5 (a1, a2, a3, a4, a5) \
int __arg6 = (int) (a6);
#define LOAD_REGS_6 \
register int _r9 asm ("r9") = __arg6; \
LOAD_REGS_5
#define ASM_ARGS_6 ASM_ARGS_5, "r" (_r9)
#define __SYSCALL_CLOBBERS "memory"
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */
#if 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_GUARD(guard) ldw guard, POINTER_GUARD(r23)
# define PTR_MANGLE(dst, src, guard) xor dst, src, guard
# define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
# else
# define PTR_MANGLE(var) \
(var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
# define PTR_DEMANGLE(var) PTR_MANGLE (var)
# endif
#endif
#endif /* linux/nios2/sysdep.h */
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