LXR linux/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
  20extern const unsigned long sys_call_table[];
  21
  22static inline int syscall_get_nr(struct task_struct *task,
  23                                 struct pt_regs *regs)
  24{
  25        return task_thread_info(task)->syscall;
  26}
  27
  28static inline void syscall_rollback(struct task_struct *task,
  29                                    struct pt_regs *regs)
  30{
  31        regs->ARM_r0 = regs->ARM_ORIG_r0;
  32}
  33
  34static 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
  41static inline long syscall_get_return_value(struct task_struct *task,
  42                                            struct pt_regs *regs)
  43{
  44        return regs->ARM_r0;
  45}
  46
  47static 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
  56static 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
  66static 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
  76static 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 */
  83