arch/loongarch/include/asm/syscall.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Author: Hanlu Li <lihanlu@loongson.cn>
   4  *         Huacai Chen <chenhuacai@loongson.cn>
   5  *
   6  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   7  */
   8
   9 #ifndef __ASM_LOONGARCH_SYSCALL_H
  10 #define __ASM_LOONGARCH_SYSCALL_H
  11
  12 #include <linux/compiler.h>
  13 #include <uapi/linux/audit.h>
  14 #include <linux/elf-em.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/uaccess.h>
  18 #include <asm/ptrace.h>
  19 #include <asm/unistd.h>
  20
  21 extern void *sys_call_table[];
  22
  23 static inline long syscall_get_nr(struct task_struct *task,
  24                                   struct pt_regs *regs)
  25 {
  26         return regs->regs[11];
  27 }
  28
  29 static inline void syscall_rollback(struct task_struct *task,
  30                                     struct pt_regs *regs)
  31 {
  32         regs->regs[4] = regs->orig_a0;
  33 }
  34
  35 static inline long syscall_get_error(struct task_struct *task,
  36                                      struct pt_regs *regs)
  37 {
  38         unsigned long error = regs->regs[4];
  39
  40         return IS_ERR_VALUE(error) ? error : 0;
  41 }
  42
  43 static inline long syscall_get_return_value(struct task_struct *task,
  44                                             struct pt_regs *regs)
  45 {
  46         return regs->regs[4];
  47 }
  48
  49 static inline void syscall_set_return_value(struct task_struct *task,
  50                                             struct pt_regs *regs,
  51                                             int error, long val)
  52 {
  53         regs->regs[4] = (long) error ? error : val;
  54 }
  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->orig_a0;
  61         memcpy(&args[1], &regs->regs[5], 5 * sizeof(long));
  62 }
  63
  64 static inline int syscall_get_arch(struct task_struct *task)
  65 {
  66         return AUDIT_ARCH_LOONGARCH64;
  67 }
  68
  69 static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
  70 {
  71         return false;
  72 }
  73
  74 #endif  /* __ASM_LOONGARCH_SYSCALL_H */