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        unsigned long error = regs->gprs[2];
  37#ifdef CONFIG_COMPAT
  38        if (test_tsk_thread_flag(task, TIF_31BIT)) {
  39                /*
  40                 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
  41                 * and will match correctly in comparisons.
  42                 */
  43                error = (long)(int)error;
  44        }
  45#endif
  46        return IS_ERR_VALUE(error) ? error : 0;
  47}
  48
  49static inline long syscall_get_return_value(struct task_struct *task,
  50                                            struct pt_regs *regs)
  51{
  52        return regs->gprs[2];
  53}
  54
  55static inline void syscall_set_return_value(struct task_struct *task,
  56                                            struct pt_regs *regs,
  57                                            int error, long val)
  58{
  59        regs->gprs[2] = error ? error : val;
  60}
  61
  62static inline void syscall_get_arguments(struct task_struct *task,
  63                                         struct pt_regs *regs,
  64                                         unsigned long *args)
  65{
  66        unsigned long mask = -1UL;
  67        unsigned int n = 6;
  68
  69#ifdef CONFIG_COMPAT
  70        if (test_tsk_thread_flag(task, TIF_31BIT))
  71                mask = 0xffffffff;
  72#endif
  73        while (n-- > 0)
  74                if (n > 0)
  75                        args[n] = regs->gprs[2 + n] & mask;
  76
  77        args[0] = regs->orig_gpr2 & mask;
  78}
  79
  80static inline void syscall_set_arguments(struct task_struct *task,
  81                                         struct pt_regs *regs,
  82                                         const unsigned long *args)
  83{
  84        unsigned int n = 6;
  85
  86        while (n-- > 0)
  87                if (n > 0)
  88                        regs->gprs[2 + n] = args[n];
  89        regs->orig_gpr2 = args[0];
  90}
  91
  92static inline int syscall_get_arch(struct task_struct *task)
  93{
  94#ifdef CONFIG_COMPAT
  95        if (test_tsk_thread_flag(task, TIF_31BIT))
  96                return AUDIT_ARCH_S390;
  97#endif
  98        return AUDIT_ARCH_S390X;
  99}
 100#endif  /* _ASM_SYSCALL_H */
 101