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(struct task_struct *task) 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 long *args) 63 { 64 static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS; 65 unsigned int i; 66 67 for (i = 0; i < 6; ++i) 68 args[i] = regs->areg[reg[i]]; 69 } 70 71 static inline void syscall_set_arguments(struct task_struct *task, 72 struct pt_regs *regs, 73 const unsigned long *args) 74 { 75 static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS; 76 unsigned int i; 77 78 for (i = 0; i < 6; ++i) 79 regs->areg[reg[i]] = args[i]; 80 } 81 82 asmlinkage long xtensa_rt_sigreturn(struct pt_regs*); 83 asmlinkage long xtensa_shmat(int, char __user *, int); 84 asmlinkage long xtensa_fadvise64_64(int, int, 85 unsigned long long, unsigned long long); 86 87 #endif 88