1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_MICROBLAZE_SYSCALL_H 3 #define __ASM_MICROBLAZE_SYSCALL_H 4 5 #include <uapi/linux/audit.h> 6 #include <linux/kernel.h> 7 #include <linux/sched.h> 8 #include <asm/ptrace.h> 9 10 /* The system call number is given by the user in R12 */ 11 static inline long syscall_get_nr(struct task_struct *task, 12 struct pt_regs *regs) 13 { 14 return regs->r12; 15 } 16 17 static inline void syscall_set_nr(struct task_struct *task, 18 struct pt_regs *regs, 19 int nr) 20 { 21 regs->r12 = nr; 22 } 23 24 static inline void syscall_rollback(struct task_struct *task, 25 struct pt_regs *regs) 26 { 27 /* TODO. */ 28 } 29 30 static inline long syscall_get_error(struct task_struct *task, 31 struct pt_regs *regs) 32 { 33 return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0; 34 } 35 36 static inline long syscall_get_return_value(struct task_struct *task, 37 struct pt_regs *regs) 38 { 39 return regs->r3; 40 } 41 42 static inline void syscall_set_return_value(struct task_struct *task, 43 struct pt_regs *regs, 44 int error, long val) 45 { 46 if (error) 47 regs->r3 = -error; 48 else 49 regs->r3 = val; 50 } 51 52 static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs, 53 unsigned int n) 54 { 55 switch (n) { 56 case 5: return regs->r10; 57 case 4: return regs->r9; 58 case 3: return regs->r8; 59 case 2: return regs->r7; 60 case 1: return regs->r6; 61 case 0: return regs->r5; 62 default: 63 BUG(); 64 } 65 return ~0; 66 } 67 68 static inline void syscall_get_arguments(struct task_struct *task, 69 struct pt_regs *regs, 70 unsigned long *args) 71 { 72 unsigned int i = 0; 73 unsigned int n = 6; 74 75 while (n--) 76 *args++ = microblaze_get_syscall_arg(regs, i++); 77 } 78 79 asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs); 80 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs); 81 82 static inline int syscall_get_arch(struct task_struct *task) 83 { 84 return AUDIT_ARCH_MICROBLAZE; 85 } 86 #endif /* __ASM_MICROBLAZE_SYSCALL_H */ 87