// SPDX-License-Identifier: GPL-2.0+/* * Author: Hanlu Li <lihanlu@loongson.cn> *         Huacai Chen <chenhuacai@loongson.cn> * * Copyright (C) 2020-2022 Loongson Technology Corporation Limited */#include <linux/capability.h>#include <linux/entry-common.h>#include <linux/errno.h>#include <linux/linkage.h>#include <linux/nospec.h>#include <linux/objtool.h>#include <linux/syscalls.h>#include <linux/unistd.h> #include <asm/asm.h>#include <asm/exception.h>#include <asm/loongarch.h>#include <asm/signal.h>#include <asm/switch_to.h>#include <asm-generic/syscalls.h> #undef __SYSCALL#define __SYSCALL(nr, call)	[nr] = (call),#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native) SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, unsigned long,		prot, unsigned long, flags, unsigned long, fd, unsigned long, offset){	if (offset & ~PAGE_MASK)		return -EINVAL; 	return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);} SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, unsigned long,		 prot, unsigned long, flags, unsigned long, fd, unsigned long, offset){	if (offset & (~PAGE_MASK >> 12))		return -EINVAL; 	return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> (PAGE_SHIFT - 12));} void *sys_call_table[__NR_syscalls] = {	[0 ... __NR_syscalls - 1] = sys_ni_syscall,#ifdef CONFIG_32BIT#include <asm/syscall_table_32.h>#else#include <asm/syscall_table_64.h>#endif}; typedef long (*sys_call_fn)(unsigned long, unsigned long,	unsigned long, unsigned long, unsigned long, unsigned long); void noinstr __no_stack_protector do_syscall(struct pt_regs *regs){	sys_call_fn syscall_fn;	unsigned long nr; 	nr = regs->regs[11];	/* Set for syscall restarting */	if (nr < NR_syscalls)		regs->regs[0] = nr + 1; 	regs->csr_era += 4;	regs->orig_a0 = regs->regs[4];	regs->regs[4] = -ENOSYS; 	if (likely(syscall_enter_from_user_mode_randomize_stack(regs, &nr))) {		if (nr < NR_syscalls) {			syscall_fn = sys_call_table[array_index_nospec(nr, NR_syscalls)];			regs->regs[4] = syscall_fn(regs->orig_a0, regs->regs[5], regs->regs[6],						   regs->regs[7], regs->regs[8], regs->regs[9]);		}	} 	syscall_exit_to_user_mode(regs);}