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
  17 extern const unsigned long sys_call_table[];
  18 extern const unsigned long sys_call_table_emu[];
  19
  20 static 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
  27 static inline void syscall_rollback(struct task_struct *task,
  28                                     struct pt_regs *regs)
  29 {
  30         regs->gprs[2] = regs->orig_gpr2;
  31 }
  32
  33 static 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
  39 static inline long syscall_get_return_value(struct task_struct *task,
  40                                             struct pt_regs *regs)
  41 {
  42         return regs->gprs[2];
  43 }
  44
  45 static 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
  52 static 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
  70 static 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
  82 static 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 */