| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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 */ |