119e2e172SRalf Baechle /* 2*c0ff3c53SRalf Baechle * Access to user system call parameters and results 3*c0ff3c53SRalf Baechle * 419e2e172SRalf Baechle * This file is subject to the terms and conditions of the GNU General Public 519e2e172SRalf Baechle * License. See the file "COPYING" in the main directory of this archive 619e2e172SRalf Baechle * for more details. 719e2e172SRalf Baechle * 8*c0ff3c53SRalf Baechle * See asm-generic/syscall.h for descriptions of what we must do here. 9*c0ff3c53SRalf Baechle * 1019e2e172SRalf Baechle * Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org> 1119e2e172SRalf Baechle */ 1219e2e172SRalf Baechle 1319e2e172SRalf Baechle #ifndef __ASM_MIPS_SYSCALL_H 1419e2e172SRalf Baechle #define __ASM_MIPS_SYSCALL_H 1519e2e172SRalf Baechle 16*c0ff3c53SRalf Baechle #include <linux/kernel.h> 17*c0ff3c53SRalf Baechle #include <linux/sched.h> 18*c0ff3c53SRalf Baechle #include <linux/uaccess.h> 19*c0ff3c53SRalf Baechle #include <asm/ptrace.h> 20*c0ff3c53SRalf Baechle 21*c0ff3c53SRalf Baechle static inline long syscall_get_nr(struct task_struct *task, 22*c0ff3c53SRalf Baechle struct pt_regs *regs) 23*c0ff3c53SRalf Baechle { 24*c0ff3c53SRalf Baechle return regs->regs[2]; 25*c0ff3c53SRalf Baechle } 26*c0ff3c53SRalf Baechle 27*c0ff3c53SRalf Baechle static inline unsigned long mips_get_syscall_arg(unsigned long *arg, 28*c0ff3c53SRalf Baechle struct task_struct *task, struct pt_regs *regs, unsigned int n) 29*c0ff3c53SRalf Baechle { 30*c0ff3c53SRalf Baechle unsigned long usp = regs->regs[29]; 31*c0ff3c53SRalf Baechle 32*c0ff3c53SRalf Baechle switch (n) { 33*c0ff3c53SRalf Baechle case 0: case 1: case 2: case 3: 34*c0ff3c53SRalf Baechle *arg = regs->regs[4 + n]; 35*c0ff3c53SRalf Baechle 36*c0ff3c53SRalf Baechle return 0; 37*c0ff3c53SRalf Baechle 38*c0ff3c53SRalf Baechle #ifdef CONFIG_32BIT 39*c0ff3c53SRalf Baechle case 4: case 5: case 6: case 7: 40*c0ff3c53SRalf Baechle return get_user(*arg, (int *)usp + 4 * n); 41*c0ff3c53SRalf Baechle #endif 42*c0ff3c53SRalf Baechle 43*c0ff3c53SRalf Baechle #ifdef CONFIG_64BIT 44*c0ff3c53SRalf Baechle case 4: case 5: case 6: case 7: 45*c0ff3c53SRalf Baechle #ifdef CONFIG_MIPS32_O32 46*c0ff3c53SRalf Baechle if (test_thread_flag(TIF_32BIT_REGS)) 47*c0ff3c53SRalf Baechle return get_user(*arg, (int *)usp + 4 * n); 48*c0ff3c53SRalf Baechle else 49*c0ff3c53SRalf Baechle #endif 50*c0ff3c53SRalf Baechle *arg = regs->regs[4 + n]; 51*c0ff3c53SRalf Baechle 52*c0ff3c53SRalf Baechle return 0; 53*c0ff3c53SRalf Baechle #endif 54*c0ff3c53SRalf Baechle 55*c0ff3c53SRalf Baechle default: 56*c0ff3c53SRalf Baechle BUG(); 57*c0ff3c53SRalf Baechle } 58*c0ff3c53SRalf Baechle } 59*c0ff3c53SRalf Baechle 60*c0ff3c53SRalf Baechle static inline void syscall_get_arguments(struct task_struct *task, 61*c0ff3c53SRalf Baechle struct pt_regs *regs, 62*c0ff3c53SRalf Baechle unsigned int i, unsigned int n, 63*c0ff3c53SRalf Baechle unsigned long *args) 64*c0ff3c53SRalf Baechle { 65*c0ff3c53SRalf Baechle unsigned long arg; 66*c0ff3c53SRalf Baechle int ret; 67*c0ff3c53SRalf Baechle 68*c0ff3c53SRalf Baechle while (n--) 69*c0ff3c53SRalf Baechle ret |= mips_get_syscall_arg(&arg, task, regs, i++); 70*c0ff3c53SRalf Baechle 71*c0ff3c53SRalf Baechle /* 72*c0ff3c53SRalf Baechle * No way to communicate an error because this is a void function. 73*c0ff3c53SRalf Baechle */ 74*c0ff3c53SRalf Baechle #if 0 75*c0ff3c53SRalf Baechle return ret; 76*c0ff3c53SRalf Baechle #endif 77*c0ff3c53SRalf Baechle } 78*c0ff3c53SRalf Baechle 7919e2e172SRalf Baechle extern const unsigned long sys_call_table[]; 8019e2e172SRalf Baechle extern const unsigned long sys32_call_table[]; 8119e2e172SRalf Baechle extern const unsigned long sysn32_call_table[]; 8219e2e172SRalf Baechle 8319e2e172SRalf Baechle #endif /* __ASM_MIPS_SYSCALL_H */ 84