4ac286c4a8
The s390 syscall.tbl format differs slightly from most others, and therefore requires an s390 specific system call table generation script. With compat support gone use the opportunity to switch to generic system call table generation. The abi for all 64 bit system calls is now common, since there is no need to specify if system call entry points are only for 64 bit anymore. Furthermore create the system call table in C instead of assembler code in order to get type checking for all system call functions contained within the table. Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
139 lines
3.8 KiB
C
139 lines
3.8 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/cpufeature.h>
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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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#define __SYSCALL(nr, sym) long __s390x_##sym(struct pt_regs *);
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#include <asm/syscall_table.h>
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#undef __SYSCALL
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#define __SYSCALL(nr, sym) [nr] = (__s390x_##sym),
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const sys_call_ptr_t sys_call_table[__NR_syscalls] = {
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#include <asm/syscall_table.h>
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};
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#undef __SYSCALL
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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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void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
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{
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unsigned long nr;
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add_random_kstack_offset();
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enter_from_user_mode(regs);
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regs->psw = get_lowcore()->svc_old_psw;
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regs->int_code = get_lowcore()->svc_int_code;
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update_timer_sys();
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if (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 (unlikely(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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nr = regs->int_code & 0xffff;
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if (likely(!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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regs->gprs[2] = sys_call_table[nr](regs);
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out:
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syscall_exit_to_user_mode(regs);
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}
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