1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __ASM_SYSCALL_H 4 #define __ASM_SYSCALL_H 5 6 #include <linux/sched.h> 7 #include <linux/err.h> 8 #include <abi/regdef.h> 9 10 static inline int 11 syscall_get_nr(struct task_struct *task, struct pt_regs *regs) 12 { 13 return regs_syscallid(regs); 14 } 15 16 static inline void 17 syscall_rollback(struct task_struct *task, struct pt_regs *regs) 18 { 19 regs->a0 = regs->orig_a0; 20 } 21 22 static inline long 23 syscall_get_error(struct task_struct *task, struct pt_regs *regs) 24 { 25 unsigned long error = regs->a0; 26 27 return IS_ERR_VALUE(error) ? error : 0; 28 } 29 30 static inline long 31 syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) 32 { 33 return regs->a0; 34 } 35 36 static inline void 37 syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, 38 int error, long val) 39 { 40 regs->a0 = (long) error ?: val; 41 } 42 43 static inline void 44 syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, 45 unsigned int i, unsigned int n, unsigned long *args) 46 { 47 BUG_ON(i + n > 6); 48 if (i == 0) { 49 args[0] = regs->orig_a0; 50 args++; 51 i++; 52 n--; 53 } 54 memcpy(args, ®s->a1 + i * sizeof(regs->a1), n * sizeof(args[0])); 55 } 56 57 static inline void 58 syscall_set_arguments(struct task_struct *task, struct pt_regs *regs, 59 unsigned int i, unsigned int n, const unsigned long *args) 60 { 61 BUG_ON(i + n > 6); 62 if (i == 0) { 63 regs->orig_a0 = args[0]; 64 args++; 65 i++; 66 n--; 67 } 68 memcpy(®s->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0)); 69 } 70 71 #endif /* __ASM_SYSCALL_H */ 72