1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_SYSCALL_32_H
3 #define __ASM_SH_SYSCALL_32_H
4
5 #include <uapi/linux/audit.h>
6 #include <linux/kernel.h>
7 #include <linux/sched.h>
8 #include <linux/err.h>
9 #include <asm/ptrace.h>
10
11 /* The system call number is given by the user in R3 */
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)12 static inline long syscall_get_nr(struct task_struct *task,
13 struct pt_regs *regs)
14 {
15 return (regs->tra >= 0) ? regs->regs[3] : -1L;
16 }
17
syscall_set_nr(struct task_struct * task,struct pt_regs * regs,int nr)18 static inline void syscall_set_nr(struct task_struct *task,
19 struct pt_regs *regs,
20 int nr)
21 {
22 /*
23 * Unlike syscall_get_nr(), syscall_set_nr() can be called only when
24 * the target task is stopped for tracing on entering syscall, so
25 * there is no need to have the same check syscall_get_nr() has.
26 */
27 regs->regs[3] = nr;
28 }
29
syscall_rollback(struct task_struct * task,struct pt_regs * regs)30 static inline void syscall_rollback(struct task_struct *task,
31 struct pt_regs *regs)
32 {
33 /*
34 * XXX: This needs some thought. On SH we don't
35 * save away the original r0 value anywhere.
36 */
37 }
38
syscall_get_error(struct task_struct * task,struct pt_regs * regs)39 static inline long syscall_get_error(struct task_struct *task,
40 struct pt_regs *regs)
41 {
42 return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0;
43 }
44
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)45 static inline long syscall_get_return_value(struct task_struct *task,
46 struct pt_regs *regs)
47 {
48 return regs->regs[0];
49 }
50
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)51 static inline void syscall_set_return_value(struct task_struct *task,
52 struct pt_regs *regs,
53 int error, long val)
54 {
55 regs->regs[0] = (long) error ?: val;
56 }
57
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)58 static inline void syscall_get_arguments(struct task_struct *task,
59 struct pt_regs *regs,
60 unsigned long *args)
61 {
62
63 /* Argument pattern is: R4, R5, R6, R7, R0, R1 */
64 args[5] = regs->regs[1];
65 args[4] = regs->regs[0];
66 args[3] = regs->regs[7];
67 args[2] = regs->regs[6];
68 args[1] = regs->regs[5];
69 args[0] = regs->regs[4];
70 }
71
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,const unsigned long * args)72 static inline void syscall_set_arguments(struct task_struct *task,
73 struct pt_regs *regs,
74 const unsigned long *args)
75 {
76 regs->regs[1] = args[5];
77 regs->regs[0] = args[4];
78 regs->regs[7] = args[3];
79 regs->regs[6] = args[2];
80 regs->regs[5] = args[1];
81 regs->regs[4] = args[0];
82 }
83
syscall_get_arch(struct task_struct * task)84 static inline int syscall_get_arch(struct task_struct *task)
85 {
86 int arch = AUDIT_ARCH_SH;
87
88 #ifdef CONFIG_CPU_LITTLE_ENDIAN
89 arch |= __AUDIT_ARCH_LE;
90 #endif
91 return arch;
92 }
93 #endif /* __ASM_SH_SYSCALL_32_H */
94