1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Author: Hanlu Li <lihanlu@loongson.cn> 4 * Huacai Chen <chenhuacai@loongson.cn> 5 * 6 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 7 */ 8 #include <linux/capability.h> 9 #include <linux/entry-common.h> 10 #include <linux/errno.h> 11 #include <linux/linkage.h> 12 #include <linux/syscalls.h> 13 #include <linux/unistd.h> 14 15 #include <asm/asm.h> 16 #include <asm/exception.h> 17 #include <asm/signal.h> 18 #include <asm/switch_to.h> 19 #include <asm-generic/syscalls.h> 20 21 #undef __SYSCALL 22 #define __SYSCALL(nr, call) [nr] = (call), 23 24 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, unsigned long, 25 prot, unsigned long, flags, unsigned long, fd, off_t, offset) 26 { 27 if (offset & ~PAGE_MASK) 28 return -EINVAL; 29 30 return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 31 } 32 33 void *sys_call_table[__NR_syscalls] = { 34 [0 ... __NR_syscalls - 1] = sys_ni_syscall, 35 #include <asm/unistd.h> 36 }; 37 38 typedef long (*sys_call_fn)(unsigned long, unsigned long, 39 unsigned long, unsigned long, unsigned long, unsigned long); 40 41 void noinstr do_syscall(struct pt_regs *regs) 42 { 43 unsigned long nr; 44 sys_call_fn syscall_fn; 45 46 nr = regs->regs[11]; 47 /* Set for syscall restarting */ 48 if (nr < NR_syscalls) 49 regs->regs[0] = nr + 1; 50 51 regs->csr_era += 4; 52 regs->orig_a0 = regs->regs[4]; 53 regs->regs[4] = -ENOSYS; 54 55 nr = syscall_enter_from_user_mode(regs, nr); 56 57 if (nr < NR_syscalls) { 58 syscall_fn = sys_call_table[nr]; 59 regs->regs[4] = syscall_fn(regs->orig_a0, regs->regs[5], regs->regs[6], 60 regs->regs[7], regs->regs[8], regs->regs[9]); 61 } 62 63 syscall_exit_to_user_mode(regs); 64 } 65