/* 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__ */