mirror of https://gitee.com/openkylin/linux.git
224 lines
5.2 KiB
C
224 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* linux/arch/sparc/kernel/sys_sparc.c
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/sparc
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/debug.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/utsname.h>
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#include <linux/smp.h>
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#include <linux/ipc.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include "systbls.h"
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/* #define DEBUG_UNIMP_SYSCALL */
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/* XXX Make this per-binary type, this way we can detect the type of
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* XXX a binary. Every Sparc executable calls this very early on.
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*/
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SYSCALL_DEFINE0(getpagesize)
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{
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return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
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}
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct vm_unmapped_area_info info;
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if (flags & MAP_FIXED) {
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/* We do not accept a shared mapping if it would violate
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* cache aliasing constraints.
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*/
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if ((flags & MAP_SHARED) &&
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((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
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return -EINVAL;
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return addr;
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}
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/* See asm-sparc/uaccess.h */
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if (len > TASK_SIZE - PAGE_SIZE)
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return -ENOMEM;
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if (!addr)
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addr = TASK_UNMAPPED_BASE;
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info.flags = 0;
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info.length = len;
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info.low_limit = addr;
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info.high_limit = TASK_SIZE;
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info.align_mask = (flags & MAP_SHARED) ?
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(PAGE_MASK & (SHMLBA - 1)) : 0;
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info.align_offset = pgoff << PAGE_SHIFT;
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return vm_unmapped_area(&info);
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}
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way unix traditionally does this, though.
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*/
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SYSCALL_DEFINE0(sparc_pipe)
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{
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int fd[2];
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int error;
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error = do_pipe_flags(fd, 0);
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if (error)
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goto out;
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current_pt_regs()->u_regs[UREG_I1] = fd[1];
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error = fd[0];
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out:
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return error;
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}
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int sparc_mmap_check(unsigned long addr, unsigned long len)
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{
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/* See asm-sparc/uaccess.h */
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if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
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return -EINVAL;
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return 0;
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}
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/* Linux version of mmap */
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SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags, unsigned long, fd,
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unsigned long, pgoff)
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{
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/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
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we have. */
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return ksys_mmap_pgoff(addr, len, prot, flags, fd,
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pgoff >> (PAGE_SHIFT - 12));
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}
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SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags, unsigned long, fd,
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unsigned long, off)
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{
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/* no alignment check? */
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return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
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}
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SYSCALL_DEFINE5(sparc_remap_file_pages, unsigned long, start, unsigned long, size,
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unsigned long, prot, unsigned long, pgoff,
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unsigned long, flags)
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{
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/* This works on an existing mmap so we don't need to validate
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* the range as that was done at the original mmap call.
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*/
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return sys_remap_file_pages(start, size, prot,
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(pgoff >> (PAGE_SHIFT - 12)), flags);
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}
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SYSCALL_DEFINE0(nis_syscall)
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{
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static int count = 0;
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struct pt_regs *regs = current_pt_regs();
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if (count++ > 5)
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return -ENOSYS;
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printk ("%s[%d]: Unimplemented SPARC system call %d\n",
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current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
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#ifdef DEBUG_UNIMP_SYSCALL
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show_regs (regs);
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#endif
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return -ENOSYS;
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}
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/* #define DEBUG_SPARC_BREAKPOINT */
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asmlinkage void
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sparc_breakpoint (struct pt_regs *regs)
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{
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#ifdef DEBUG_SPARC_BREAKPOINT
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printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
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#endif
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force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc, 0, current);
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#ifdef DEBUG_SPARC_BREAKPOINT
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printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
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#endif
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}
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SYSCALL_DEFINE3(sparc_sigaction, int, sig,
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struct old_sigaction __user *,act,
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struct old_sigaction __user *,oact)
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{
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WARN_ON_ONCE(sig >= 0);
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return sys_sigaction(-sig, act, oact);
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}
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SYSCALL_DEFINE5(rt_sigaction, int, sig,
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const struct sigaction __user *, act,
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struct sigaction __user *, oact,
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void __user *, restorer,
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size_t, sigsetsize)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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/* XXX: Don't preclude handling different sized sigset_t's. */
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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if (act) {
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new_ka.ka_restorer = restorer;
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if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
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return -EFAULT;
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
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return -EFAULT;
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}
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return ret;
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}
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SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
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{
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int nlen, err;
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char tmp[__NEW_UTS_LEN + 1];
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if (len < 0)
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return -EINVAL;
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down_read(&uts_sem);
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nlen = strlen(utsname()->domainname) + 1;
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err = -EINVAL;
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if (nlen > len)
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goto out_unlock;
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memcpy(tmp, utsname()->domainname, nlen);
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up_read(&uts_sem);
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if (copy_to_user(name, tmp, nlen))
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return -EFAULT;
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return 0;
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out_unlock:
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up_read(&uts_sem);
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return err;
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}
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