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/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
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 <common/sysdep.h>
#include <bits/wordsize.h>
#include <arch/abi.h>
#undef SYS_ify
#define SYS_ify(syscall_name) __NR_##syscall_name
#if defined __ASSEMBLER__
/* Make use of .size directive. */
#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
/* Define an entry point visible from C. */
#define ENTRY(name) \
.globl C_SYMBOL_NAME(name); \
.type C_SYMBOL_NAME(name),@function; \
.align 8; \
C_LABEL(name) \
cfi_startproc; \
#undef END
#define END(name) \
cfi_endproc; \
ASM_SIZE_DIRECTIVE(name)
/* Since C identifiers are not normally prefixed with an underscore
on this system, the asm identifier `syscall_error' intrudes on the
C name space. Make sure we use an innocuous name. */
#define syscall_error __syscall_error
/* Local label name for asm code. */
#define L(name) .L##name
/* Specify the size in bytes of a machine register. */
#define REGSIZE 8
/* Provide "pointer-oriented" instruction variants. These differ not
just for tilepro vs tilegx, but also for tilegx -m64 vs -m32. */
#if __WORDSIZE == 32
#define ADD_PTR addx
#define ADDI_PTR addxi
#define ADDLI_PTR addxli
#define LD_PTR ld4s
#define ST_PTR st4
#define SHL_PTR_ADD shl2add
#else
#define ADD_PTR add
#define ADDI_PTR addi
#define ADDLI_PTR addli
#define LD_PTR LD
#define ST_PTR ST
#define SHL_PTR_ADD shl3add
#endif
/* 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 SHARED
/* For static code, on error jump to __syscall_error directly. */
# define SYSCALL_ERROR_NAME __syscall_error
#elif IS_IN_libc || 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
#undef PSEUDO_END
#define PSEUDO_END(name) \
0: \
j SYSCALL_ERROR_NAME; \
END (name)
#undef PSEUDO_NOERRNO
#define PSEUDO_NOERRNO(name, syscall_name, args) \
ENTRY (name); \
DO_CALL(syscall_name, args)
#define ret_NOERRNO jrp lr
#undef PSEUDO_END_NOERRNO
#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)
#endif /* __ASSEMBLER__ */
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