1/* Copyright (C) 2001-2021 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library. If not, see 16 <https://www.gnu.org/licenses/>. */ 17 18#include <sysdep.h> 19 20#include <sys/asm.h> 21 22/* Usage: 23 long int syscall (syscall_number, arg1, arg2, arg3, arg4, arg5, arg6, arg7) 24 25 We need to do some arg shifting, syscall_number will be in v0. */ 26 27 28 .text 29NESTED (syscall, SZREG, ra) 30 .mask 0x00010000, -SZREG 31 .fmask 0x00000000, 0 32 PTR_ADDIU sp, -SZREG 33 cfi_adjust_cfa_offset (SZREG) 34 REG_S s0, (sp) 35 cfi_rel_offset (s0, 0) 36 37 move s0, a0 38 move a0, a1 /* shift arg1 - arg7. */ 39 move a1, a2 40 move a2, a3 41 move a3, a4 42 move a4, a5 43 move a5, a6 44 move a6, a7 45 46 move v0, s0 /* Syscall number -> v0 */ 47 syscall /* Do the system call. */ 48 49 REG_L s0, (sp) 50 cfi_restore (s0) 51 PTR_ADDIU sp, SZREG 52 cfi_adjust_cfa_offset (-SZREG) 53 bne a3, zero, L(error) 54 55 ret 56 57L(error): 58 SETUP_GP64_REG (a0, syscall) 59 PTR_LA t9, __syscall_error 60 RESTORE_GP64_REG 61 jr t9 62 63END (syscall) 64