LXR linux/arch/microblaze/include/asm/syscall.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_MICROBLAZE_SYSCALL_H
   3#define __ASM_MICROBLAZE_SYSCALL_H
   4
   5#include <uapi/linux/audit.h>
   6#include <linux/kernel.h>
   7#include <linux/sched.h>
   8#include <asm/ptrace.h>
   9
  10/* The system call number is given by the user in R12 */
  11static inline long syscall_get_nr(struct task_struct *task,
  12                                  struct pt_regs *regs)
  13{
  14        return regs->r12;
  15}
  16
  17static inline void syscall_rollback(struct task_struct *task,
  18                                    struct pt_regs *regs)
  19{
  20        /* TODO.  */
  21}
  22
  23static inline long syscall_get_error(struct task_struct *task,
  24                                     struct pt_regs *regs)
  25{
  26        return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
  27}
  28
  29static inline long syscall_get_return_value(struct task_struct *task,
  30                                            struct pt_regs *regs)
  31{
  32        return regs->r3;
  33}
  34
  35static inline void syscall_set_return_value(struct task_struct *task,
  36                                            struct pt_regs *regs,
  37                                            int error, long val)
  38{
  39        if (error)
  40                regs->r3 = -error;
  41        else
  42                regs->r3 = val;
  43}
  44
  45static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
  46                                                          unsigned int n)
  47{
  48        switch (n) {
  49        case 5: return regs->r10;
  50        case 4: return regs->r9;
  51        case 3: return regs->r8;
  52        case 2: return regs->r7;
  53        case 1: return regs->r6;
  54        case 0: return regs->r5;
  55        default:
  56                BUG();
  57        }
  58        return ~0;
  59}
  60
  61static inline void microblaze_set_syscall_arg(struct pt_regs *regs,
  62                                              unsigned int n,
  63                                              unsigned long val)
  64{
  65        switch (n) {
  66        case 5:
  67                regs->r10 = val;
  68        case 4:
  69                regs->r9 = val;
  70        case 3:
  71                regs->r8 = val;
  72        case 2:
  73                regs->r7 = val;
  74        case 1:
  75                regs->r6 = val;
  76        case 0:
  77                regs->r5 = val;
  78        default:
  79                BUG();
  80        }
  81}
  82
  83static inline void syscall_get_arguments(struct task_struct *task,
  84                                         struct pt_regs *regs,
  85                                         unsigned long *args)
  86{
  87        unsigned int i = 0;
  88        unsigned int n = 6;
  89
  90        while (n--)
  91                *args++ = microblaze_get_syscall_arg(regs, i++);
  92}
  93
  94static inline void syscall_set_arguments(struct task_struct *task,
  95                                         struct pt_regs *regs,
  96                                         const unsigned long *args)
  97{
  98        unsigned int i = 0;
  99        unsigned int n = 6;
 100
 101        while (n--)
 102                microblaze_set_syscall_arg(regs, i++, *args++);
 103}
 104
 105asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
 106asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
 107
 108static inline int syscall_get_arch(struct task_struct *task)
 109{
 110        return AUDIT_ARCH_MICROBLAZE;
 111}
 112#endif /* __ASM_MICROBLAZE_SYSCALL_H */
 113