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        if (IS_ENABLED(CONFIG_AEABI) && !IS_ENABLED(CONFIG_OABI_COMPAT))
  26                return task_thread_info(task)->abi_syscall;
  27
  28        return task_thread_info(task)->abi_syscall & __NR_SYSCALL_MASK;
  29}
  30
  31static inline bool __in_oabi_syscall(struct task_struct *task)
  32{
  33        return IS_ENABLED(CONFIG_OABI_COMPAT) &&
  34                (task_thread_info(task)->abi_syscall & __NR_OABI_SYSCALL_BASE);
  35}
  36
  37static inline bool in_oabi_syscall(void)
  38{
  39        return __in_oabi_syscall(current);
  40}
  41
  42static inline void syscall_rollback(struct task_struct *task,
  43                                    struct pt_regs *regs)
  44{
  45        regs->ARM_r0 = regs->ARM_ORIG_r0;
  46}
  47
  48static inline long syscall_get_error(struct task_struct *task,
  49                                     struct pt_regs *regs)
  50{
  51        unsigned long error = regs->ARM_r0;
  52        return IS_ERR_VALUE(error) ? error : 0;
  53}
  54
  55static inline long syscall_get_return_value(struct task_struct *task,
  56                                            struct pt_regs *regs)
  57{
  58        return regs->ARM_r0;
  59}
  60
  61static inline void syscall_set_return_value(struct task_struct *task,
  62                                            struct pt_regs *regs,
  63                                            int error, long val)
  64{
  65        regs->ARM_r0 = (long) error ? error : val;
  66}
  67
  68#define SYSCALL_MAX_ARGS 7
  69
  70static inline void syscall_get_arguments(struct task_struct *task,
  71                                         struct pt_regs *regs,
  72                                         unsigned long *args)
  73{
  74        args[0] = regs->ARM_ORIG_r0;
  75        args++;
  76
  77        memcpy(args, &regs->ARM_r0 + 1, 5 * sizeof(args[0]));
  78}
  79
  80static inline void syscall_set_arguments(struct task_struct *task,
  81                                         struct pt_regs *regs,
  82                                         const unsigned long *args)
  83{
  84        regs->ARM_ORIG_r0 = args[0];
  85        args++;
  86
  87        memcpy(&regs->ARM_r0 + 1, args, 5 * sizeof(args[0]));
  88}
  89
  90static inline int syscall_get_arch(struct task_struct *task)
  91{
  92        /* ARM tasks don't change audit architectures on the fly. */
  93        return AUDIT_ARCH_ARM;
  94}
  95
  96#endif /* _ASM_ARM_SYSCALL_H */
  97