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