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/signal.h> 17 #include <asm/switch_to.h> 18 #include <asm-generic/syscalls.h> 19 20 #undef __SYSCALL 21 #define __SYSCALL(nr, call) [nr] = (call), 22 23 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, unsigned long, 24 prot, unsigned long, flags, unsigned long, fd, off_t, offset) 25 { 26 if (offset & ~PAGE_MASK) 27 return -EINVAL; 28 29 return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 30 } 31 32 void *sys_call_table[__NR_syscalls] = { 33 [0 ... __NR_syscalls - 1] = sys_ni_syscall, 34 #include <asm/unistd.h> 35 }; 36 37 typedef long (*sys_call_fn)(unsigned long, unsigned long, 38 unsigned long, unsigned long, unsigned long, unsigned long); 39 40 void noinstr do_syscall(struct pt_regs *regs) 41 { 42 unsigned long nr; 43 sys_call_fn syscall_fn; 44 45 nr = regs->regs[11]; 46 /* Set for syscall restarting */ 47 if (nr < NR_syscalls) 48 regs->regs[0] = nr + 1; 49 50 regs->csr_era += 4; 51 regs->orig_a0 = regs->regs[4]; 52 regs->regs[4] = -ENOSYS; 53 54 nr = syscall_enter_from_user_mode(regs, nr); 55 56 if (nr < NR_syscalls) { 57 syscall_fn = sys_call_table[nr]; 58 regs->regs[4] = syscall_fn(regs->orig_a0, regs->regs[5], regs->regs[6], 59 regs->regs[7], regs->regs[8], regs->regs[9]); 60 } 61 62 syscall_exit_to_user_mode(regs); 63 } 64