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Linux/arch/xtensa/include/asm/syscall.h

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 2001 - 2007 Tensilica Inc.
  7  * Copyright (C) 2018 Cadence Design Systems Inc.
  8  */
  9 
 10 #ifndef _ASM_SYSCALL_H
 11 #define _ASM_SYSCALL_H
 12 
 13 #include <linux/err.h>
 14 #include <asm/ptrace.h>
 15 #include <uapi/linux/audit.h>
 16 
 17 static inline int syscall_get_arch(void)
 18 {
 19         return AUDIT_ARCH_XTENSA;
 20 }
 21 
 22 typedef void (*syscall_t)(void);
 23 extern syscall_t sys_call_table[];
 24 
 25 static inline long syscall_get_nr(struct task_struct *task,
 26                                   struct pt_regs *regs)
 27 {
 28         return regs->syscall;
 29 }
 30 
 31 static inline void syscall_rollback(struct task_struct *task,
 32                                     struct pt_regs *regs)
 33 {
 34         /* Do nothing. */
 35 }
 36 
 37 static inline long syscall_get_error(struct task_struct *task,
 38                                      struct pt_regs *regs)
 39 {
 40         /* 0 if syscall succeeded, otherwise -Errorcode */
 41         return IS_ERR_VALUE(regs->areg[2]) ? regs->areg[2] : 0;
 42 }
 43 
 44 static inline long syscall_get_return_value(struct task_struct *task,
 45                                             struct pt_regs *regs)
 46 {
 47         return regs->areg[2];
 48 }
 49 
 50 static inline void syscall_set_return_value(struct task_struct *task,
 51                                             struct pt_regs *regs,
 52                                             int error, long val)
 53 {
 54         regs->areg[0] = (long) error ? error : val;
 55 }
 56 
 57 #define SYSCALL_MAX_ARGS 6
 58 #define XTENSA_SYSCALL_ARGUMENT_REGS {6, 3, 4, 5, 8, 9}
 59 
 60 static inline void syscall_get_arguments(struct task_struct *task,
 61                                          struct pt_regs *regs,
 62                                          unsigned int i, unsigned int n,
 63                                          unsigned long *args)
 64 {
 65         static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
 66         unsigned int j;
 67 
 68         if (n == 0)
 69                 return;
 70 
 71         WARN_ON_ONCE(i + n > SYSCALL_MAX_ARGS);
 72 
 73         for (j = 0; j < n; ++j) {
 74                 if (i + j < SYSCALL_MAX_ARGS)
 75                         args[j] = regs->areg[reg[i + j]];
 76                 else
 77                         args[j] = 0;
 78         }
 79 }
 80 
 81 static inline void syscall_set_arguments(struct task_struct *task,
 82                                          struct pt_regs *regs,
 83                                          unsigned int i, unsigned int n,
 84                                          const unsigned long *args)
 85 {
 86         static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
 87         unsigned int j;
 88 
 89         if (n == 0)
 90                 return;
 91 
 92         if (WARN_ON_ONCE(i + n > SYSCALL_MAX_ARGS)) {
 93                 if (i < SYSCALL_MAX_ARGS)
 94                         n = SYSCALL_MAX_ARGS - i;
 95                 else
 96                         return;
 97         }
 98 
 99         for (j = 0; j < n; ++j)
100                 regs->areg[reg[i + j]] = args[j];
101 }
102 
103 asmlinkage long xtensa_rt_sigreturn(struct pt_regs*);
104 asmlinkage long xtensa_shmat(int, char __user *, int);
105 asmlinkage long xtensa_fadvise64_64(int, int,
106                                     unsigned long long, unsigned long long);
107 
108 #endif
109 

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