1 #ifndef __ASM_MICROBLAZE_SYSCALL_H 2 #define __ASM_MICROBLAZE_SYSCALL_H 3 4 #include <linux/kernel.h> 5 #include <linux/sched.h> 6 #include <asm/ptrace.h> 7 8 /* The system call number is given by the user in R12 */ 9 static inline long syscall_get_nr(struct task_struct *task, 10 struct pt_regs *regs) 11 { 12 return regs->r12; 13 } 14 15 static inline void syscall_rollback(struct task_struct *task, 16 struct pt_regs *regs) 17 { 18 /* TODO. */ 19 } 20 21 static inline long syscall_get_error(struct task_struct *task, 22 struct pt_regs *regs) 23 { 24 return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0; 25 } 26 27 static inline long syscall_get_return_value(struct task_struct *task, 28 struct pt_regs *regs) 29 { 30 return regs->r3; 31 } 32 33 static inline void syscall_set_return_value(struct task_struct *task, 34 struct pt_regs *regs, 35 int error, long val) 36 { 37 if (error) 38 regs->r3 = -error; 39 else 40 regs->r3 = val; 41 } 42 43 static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs, 44 unsigned int n) 45 { 46 switch (n) { 47 case 5: return regs->r10; 48 case 4: return regs->r9; 49 case 3: return regs->r8; 50 case 2: return regs->r7; 51 case 1: return regs->r6; 52 case 0: return regs->r5; 53 default: 54 BUG(); 55 } 56 return ~0; 57 } 58 59 static inline void microblaze_set_syscall_arg(struct pt_regs *regs, 60 unsigned int n, 61 unsigned long val) 62 { 63 switch (n) { 64 case 5: 65 regs->r10 = val; 66 case 4: 67 regs->r9 = val; 68 case 3: 69 regs->r8 = val; 70 case 2: 71 regs->r7 = val; 72 case 1: 73 regs->r6 = val; 74 case 0: 75 regs->r5 = val; 76 default: 77 BUG(); 78 } 79 } 80 81 static inline void syscall_get_arguments(struct task_struct *task, 82 struct pt_regs *regs, 83 unsigned int i, unsigned int n, 84 unsigned long *args) 85 { 86 while (n--) 87 *args++ = microblaze_get_syscall_arg(regs, i++); 88 } 89 90 static inline void syscall_set_arguments(struct task_struct *task, 91 struct pt_regs *regs, 92 unsigned int i, unsigned int n, 93 const unsigned long *args) 94 { 95 while (n--) 96 microblaze_set_syscall_arg(regs, i++, *args++); 97 } 98 99 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs); 100 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs); 101 102 #endif /* __ASM_MICROBLAZE_SYSCALL_H */ 103