arch/arm/include/asm/syscall.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Access to user system call parameters and results
   4  *
   5  * See asm-generic/syscall.h for descriptions of what we must do here.
   6  */
   7
   8 #ifndef _ASM_ARM_SYSCALL_H
   9 #define _ASM_ARM_SYSCALL_H
  10
  11 #include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */
  12 #include <linux/elf.h> /* for ELF_EM */
  13 #include <linux/err.h>
  14 #include <linux/sched.h>
  15
  16 #include <asm/unistd.h>
  17
  18 #define NR_syscalls (__NR_syscalls)
  19
  20 extern const unsigned long sys_call_table[];
  21
  22 static inline int syscall_get_nr(struct task_struct *task,
  23                                  struct pt_regs *regs)
  24 {
  25         return task_thread_info(task)->syscall;
  26 }
  27
  28 static inline void syscall_rollback(struct task_struct *task,
  29                                     struct pt_regs *regs)
  30 {
  31         regs->ARM_r0 = regs->ARM_ORIG_r0;
  32 }
  33
  34 static inline long syscall_get_error(struct task_struct *task,
  35                                      struct pt_regs *regs)
  36 {
  37         unsigned long error = regs->ARM_r0;
  38         return IS_ERR_VALUE(error) ? error : 0;
  39 }
  40
  41 static inline long syscall_get_return_value(struct task_struct *task,
  42                                             struct pt_regs *regs)
  43 {
  44         return regs->ARM_r0;
  45 }
  46
  47 static inline void syscall_set_return_value(struct task_struct *task,
  48                                             struct pt_regs *regs,
  49                                             int error, long val)
  50 {
  51         regs->ARM_r0 = (long) error ? error : val;
  52 }
  53
  54 #define SYSCALL_MAX_ARGS 7
  55
  56 static inline void syscall_get_arguments(struct task_struct *task,
  57                                          struct pt_regs *regs,
  58                                          unsigned long *args)
  59 {
  60         args[0] = regs->ARM_ORIG_r0;
  61         args++;
  62
  63         memcpy(args, &regs->ARM_r0 + 1, 5 * sizeof(args[0]));
  64 }
  65
  66 static inline void syscall_set_arguments(struct task_struct *task,
  67                                          struct pt_regs *regs,
  68                                          const unsigned long *args)
  69 {
  70         regs->ARM_ORIG_r0 = args[0];
  71         args++;
  72
  73         memcpy(&regs->ARM_r0 + 1, args, 5 * sizeof(args[0]));
  74 }
  75
  76 static inline int syscall_get_arch(struct task_struct *task)
  77 {
  78         /* ARM tasks don't change audit architectures on the fly. */
  79         return AUDIT_ARCH_ARM;
  80 }
  81
  82 #endif /* _ASM_ARM_SYSCALL_H */