LXR linux/arch/s390/include/asm/syscall.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Access to user system call parameters and results
   4 *
   5 *  Copyright IBM Corp. 2008
   6 *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   7 */
   8
   9#ifndef _ASM_SYSCALL_H
  10#define _ASM_SYSCALL_H  1
  11
  12#include <uapi/linux/audit.h>
  13#include <linux/sched.h>
  14#include <linux/err.h>
  15#include <asm/ptrace.h>
  16
  17extern const unsigned long sys_call_table[];
  18extern const unsigned long sys_call_table_emu[];
  19
  20static inline long syscall_get_nr(struct task_struct *task,
  21                                  struct pt_regs *regs)
  22{
  23        return test_pt_regs_flag(regs, PIF_SYSCALL) ?
  24                (regs->int_code & 0xffff) : -1;
  25}
  26
  27static inline void syscall_rollback(struct task_struct *task,
  28                                    struct pt_regs *regs)
  29{
  30        regs->gprs[2] = regs->orig_gpr2;
  31}
  32
  33static inline long syscall_get_error(struct task_struct *task,
  34                                     struct pt_regs *regs)
  35{
  36        return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0;
  37}
  38
  39static inline long syscall_get_return_value(struct task_struct *task,
  40                                            struct pt_regs *regs)
  41{
  42        return regs->gprs[2];
  43}
  44
  45static inline void syscall_set_return_value(struct task_struct *task,
  46                                            struct pt_regs *regs,
  47                                            int error, long val)
  48{
  49        regs->gprs[2] = error ? error : val;
  50}
  51
  52static inline void syscall_get_arguments(struct task_struct *task,
  53                                         struct pt_regs *regs,
  54                                         unsigned long *args)
  55{
  56        unsigned long mask = -1UL;
  57        unsigned int n = 6;
  58
  59#ifdef CONFIG_COMPAT
  60        if (test_tsk_thread_flag(task, TIF_31BIT))
  61                mask = 0xffffffff;
  62#endif
  63        while (n-- > 0)
  64                if (n > 0)
  65                        args[n] = regs->gprs[2 + n] & mask;
  66
  67        args[0] = regs->orig_gpr2 & mask;
  68}
  69
  70static inline void syscall_set_arguments(struct task_struct *task,
  71                                         struct pt_regs *regs,
  72                                         const unsigned long *args)
  73{
  74        unsigned int n = 6;
  75
  76        while (n-- > 0)
  77                if (n > 0)
  78                        regs->gprs[2 + n] = args[n];
  79        regs->orig_gpr2 = args[0];
  80}
  81
  82static inline int syscall_get_arch(struct task_struct *task)
  83{
  84#ifdef CONFIG_COMPAT
  85        if (test_tsk_thread_flag(task, TIF_31BIT))
  86                return AUDIT_ARCH_S390;
  87#endif
  88        return AUDIT_ARCH_S390X;
  89}
  90#endif  /* _ASM_SYSCALL_H */
  91