171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* S390 version
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* Copyright IBM Corp. 1999, 2000
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Thomas Spatzier (tspat@de.ibm.com)
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*
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* Derived from "arch/i386/kernel/sys_i386.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/s390
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/smp.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/file.h>
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#include <linux/utsname.h>
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#include <linux/personality.h>
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#include <linux/unistd.h>
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#include <linux/ipc.h>
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#include <linux/uaccess.h>
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#include <linux/string.h>
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#include <linux/thread_info.h>
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#include <linux/entry-common.h>
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#include <asm/ptrace.h>
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#include <asm/vtime.h>
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#include "entry.h"
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/*
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* Perform the mmap() system call. Linux for S/390 isn't able to handle more
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* than 5 system call parameters, so this system call uses a memory block
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* for parameter passing.
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*/
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struct s390_mmap_arg_struct {
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unsigned long addr;
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unsigned long len;
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unsigned long prot;
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unsigned long flags;
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unsigned long fd;
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unsigned long offset;
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};
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SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
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{
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struct s390_mmap_arg_struct a;
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int error = -EFAULT;
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if (copy_from_user(&a, arg, sizeof(a)))
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goto out;
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error = ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
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out:
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return error;
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}
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#ifdef CONFIG_SYSVIPC
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls.
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*/
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SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
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unsigned long, third, void __user *, ptr)
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{
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if (call >> 16)
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return -EINVAL;
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/* The s390 sys_ipc variant has only five parameters instead of six
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* like the generic variant. The only difference is the handling of
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* the SEMTIMEDOP subcall where on s390 the third parameter is used
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* as a pointer to a struct timespec where the generic variant uses
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* the fifth parameter.
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* Therefore we can call the generic variant by simply passing the
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* third parameter also as fifth parameter.
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*/
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return ksys_ipc(call, first, second, third, ptr, third);
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}
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#endif /* CONFIG_SYSVIPC */
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SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
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{
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unsigned int ret = current->personality;
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if (personality(current->personality) == PER_LINUX32 &&
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personality(personality) == PER_LINUX)
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personality |= PER_LINUX32;
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if (personality != 0xffffffff)
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set_personality(personality);
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if (personality(ret) == PER_LINUX32)
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ret &= ~PER_LINUX32;
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return ret;
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}
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SYSCALL_DEFINE0(ni_syscall)
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{
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return -ENOSYS;
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}
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static void do_syscall(struct pt_regs *regs)
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{
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unsigned long nr;
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nr = regs->int_code & 0xffff;
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if (!nr) {
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nr = regs->gprs[1] & 0xffff;
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regs->int_code &= ~0xffffUL;
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regs->int_code |= nr;
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}
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regs->gprs[2] = nr;
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if (nr == __NR_restart_syscall && !(current->restart_block.arch_data & 1)) {
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regs->psw.addr = current->restart_block.arch_data;
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current->restart_block.arch_data = 1;
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}
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nr = syscall_enter_from_user_mode_work(regs, nr);
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/*
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* In the s390 ptrace ABI, both the syscall number and the return value
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* use gpr2. However, userspace puts the syscall number either in the
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* svc instruction itself, or uses gpr1. To make at least skipping syscalls
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* work, the ptrace code sets PIF_SYSCALL_RET_SET, which is checked here
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* and if set, the syscall will be skipped.
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*/
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if (unlikely(test_and_clear_pt_regs_flag(regs, PIF_SYSCALL_RET_SET)))
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goto out;
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regs->gprs[2] = -ENOSYS;
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if (likely(nr >= NR_syscalls))
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goto out;
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do {
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regs->gprs[2] = current->thread.sys_call_table[nr](regs);
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} while (test_and_clear_pt_regs_flag(regs, PIF_EXECVE_PGSTE_RESTART));
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out:
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syscall_exit_to_user_mode_work(regs);
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}
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void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
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{
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add_random_kstack_offset();
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enter_from_user_mode(regs);
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regs->psw = S390_lowcore.svc_old_psw;
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regs->int_code = S390_lowcore.svc_int_code;
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update_timer_sys();
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if (static_branch_likely(&cpu_has_bear))
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current->thread.last_break = regs->last_break;
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local_irq_enable();
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regs->orig_gpr2 = regs->gprs[2];
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if (per_trap)
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set_thread_flag(TIF_PER_TRAP);
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regs->flags = 0;
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set_pt_regs_flag(regs, PIF_SYSCALL);
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do_syscall(regs);
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exit_to_user_mode();
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}
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