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_rollback(struct task_struct *task, 18 struct pt_regs *regs) 19 { 20 /* TODO. */ 21 } 22 23 static inline long syscall_get_error(struct task_struct *task, 24 struct pt_regs *regs) 25 { 26 return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0; 27 } 28 29 static inline long syscall_get_return_value(struct task_struct *task, 30 struct pt_regs *regs) 31 { 32 return regs->r3; 33 } 34 35 static inline void syscall_set_return_value(struct task_struct *task, 36 struct pt_regs *regs, 37 int error, long val) 38 { 39 if (error) 40 regs->r3 = -error; 41 else 42 regs->r3 = val; 43 } 44 45 static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs, 46 unsigned int n) 47 { 48 switch (n) { 49 case 5: return regs->r10; 50 case 4: return regs->r9; 51 case 3: return regs->r8; 52 case 2: return regs->r7; 53 case 1: return regs->r6; 54 case 0: return regs->r5; 55 default: 56 BUG(); 57 } 58 return ~0; 59 } 60 61 static inline void microblaze_set_syscall_arg(struct pt_regs *regs, 62 unsigned int n, 63 unsigned long val) 64 { 65 switch (n) { 66 case 5: 67 regs->r10 = val; 68 case 4: 69 regs->r9 = val; 70 case 3: 71 regs->r8 = val; 72 case 2: 73 regs->r7 = val; 74 case 1: 75 regs->r6 = val; 76 case 0: 77 regs->r5 = val; 78 default: 79 BUG(); 80 } 81 } 82 83 static inline void syscall_get_arguments(struct task_struct *task, 84 struct pt_regs *regs, 85 unsigned int i, unsigned int n, 86 unsigned long *args) 87 { 88 while (n--) 89 *args++ = microblaze_get_syscall_arg(regs, i++); 90 } 91 92 static inline void syscall_set_arguments(struct task_struct *task, 93 struct pt_regs *regs, 94 unsigned int i, unsigned int n, 95 const unsigned long *args) 96 { 97 while (n--) 98 microblaze_set_syscall_arg(regs, i++, *args++); 99 } 100 101 asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs); 102 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs); 103 104 static inline int syscall_get_arch(void) 105 { 106 return AUDIT_ARCH_MICROBLAZE; 107 } 108 #endif /* __ASM_MICROBLAZE_SYSCALL_H */ 109