1 /* 2 * Access to user system call parameters and results 3 * 4 * See asm-generic/syscall.h for function descriptions. 5 * 6 * Copyright (C) 2015 Mickaël Salaün <mic@digikod.net> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #ifndef __UM_SYSCALL_GENERIC_H 14 #define __UM_SYSCALL_GENERIC_H 15 16 #include <asm/ptrace.h> 17 #include <linux/err.h> 18 #include <linux/sched.h> 19 #include <sysdep/ptrace.h> 20 21 static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) 22 { 23 24 return PT_REGS_SYSCALL_NR(regs); 25 } 26 27 static inline void syscall_rollback(struct task_struct *task, 28 struct pt_regs *regs) 29 { 30 /* do nothing */ 31 } 32 33 static inline long syscall_get_error(struct task_struct *task, 34 struct pt_regs *regs) 35 { 36 const long error = regs_return_value(regs); 37 38 return IS_ERR_VALUE(error) ? error : 0; 39 } 40 41 static inline long syscall_get_return_value(struct task_struct *task, 42 struct pt_regs *regs) 43 { 44 return regs_return_value(regs); 45 } 46 47 static inline void syscall_set_return_value(struct task_struct *task, 48 struct pt_regs *regs, 49 int error, long val) 50 { 51 PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val); 52 } 53 54 static inline void syscall_get_arguments(struct task_struct *task, 55 struct pt_regs *regs, 56 unsigned long *args) 57 { 58 const struct uml_pt_regs *r = ®s->regs; 59 60 *args++ = UPT_SYSCALL_ARG1(r); 61 *args++ = UPT_SYSCALL_ARG2(r); 62 *args++ = UPT_SYSCALL_ARG3(r); 63 *args++ = UPT_SYSCALL_ARG4(r); 64 *args++ = UPT_SYSCALL_ARG5(r); 65 *args = UPT_SYSCALL_ARG6(r); 66 } 67 68 static inline void syscall_set_arguments(struct task_struct *task, 69 struct pt_regs *regs, 70 const unsigned long *args) 71 { 72 struct uml_pt_regs *r = ®s->regs; 73 74 UPT_SYSCALL_ARG1(r) = *args++; 75 UPT_SYSCALL_ARG2(r) = *args++; 76 UPT_SYSCALL_ARG3(r) = *args++; 77 UPT_SYSCALL_ARG4(r) = *args++; 78 UPT_SYSCALL_ARG5(r) = *args++; 79 UPT_SYSCALL_ARG6(r) = *args; 80 } 81 82 /* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */ 83 84 #endif /* __UM_SYSCALL_GENERIC_H */ 85