1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Access to user system call parameters and results 4 * 5 * See asm-generic/syscall.h for descriptions of what we must do here. 6 */ 7 8 #ifndef _ASM_ARM_SYSCALL_H 9 #define _ASM_ARM_SYSCALL_H 10 11 #include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */ 12 #include <linux/elf.h> /* for ELF_EM */ 13 #include <linux/err.h> 14 #include <linux/sched.h> 15 16 #include <asm/unistd.h> 17 18 #define NR_syscalls (__NR_syscalls) 19 20 extern const unsigned long sys_call_table[]; 21 22 static inline int syscall_get_nr(struct task_struct *task, 23 struct pt_regs *regs) 24 { 25 return task_thread_info(task)->syscall; 26 } 27 28 static inline void syscall_rollback(struct task_struct *task, 29 struct pt_regs *regs) 30 { 31 regs->ARM_r0 = regs->ARM_ORIG_r0; 32 } 33 34 static inline long syscall_get_error(struct task_struct *task, 35 struct pt_regs *regs) 36 { 37 unsigned long error = regs->ARM_r0; 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->ARM_r0; 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 regs->ARM_r0 = (long) error ? error : val; 52 } 53 54 #define SYSCALL_MAX_ARGS 7 55 56 static inline void syscall_get_arguments(struct task_struct *task, 57 struct pt_regs *regs, 58 unsigned long *args) 59 { 60 args[0] = regs->ARM_ORIG_r0; 61 args++; 62 63 memcpy(args, ®s->ARM_r0 + 1, 5 * sizeof(args[0])); 64 } 65 66 static inline void syscall_set_arguments(struct task_struct *task, 67 struct pt_regs *regs, 68 const unsigned long *args) 69 { 70 regs->ARM_ORIG_r0 = args[0]; 71 args++; 72 73 memcpy(®s->ARM_r0 + 1, args, 5 * sizeof(args[0])); 74 } 75 76 static inline int syscall_get_arch(struct task_struct *task) 77 { 78 /* ARM tasks don't change audit architectures on the fly. */ 79 return AUDIT_ARCH_ARM; 80 } 81 82 #endif /* _ASM_ARM_SYSCALL_H */ 83