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63 lines
1.6 KiB
63 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Author: Hanlu Li <[email protected]> |
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* Huacai Chen <[email protected]> |
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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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