Linux kernel mirror (for testing)
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1#ifndef __ASM_SH_SYSCALL_32_H
2#define __ASM_SH_SYSCALL_32_H
3
4#include <uapi/linux/audit.h>
5#include <linux/kernel.h>
6#include <linux/sched.h>
7#include <linux/err.h>
8#include <asm/ptrace.h>
9
10/* The system call number is given by the user in R3 */
11static inline long syscall_get_nr(struct task_struct *task,
12 struct pt_regs *regs)
13{
14 return (regs->tra >= 0) ? regs->regs[3] : -1L;
15}
16
17static inline void syscall_rollback(struct task_struct *task,
18 struct pt_regs *regs)
19{
20 /*
21 * XXX: This needs some thought. On SH we don't
22 * save away the original r0 value anywhere.
23 */
24}
25
26static inline long syscall_get_error(struct task_struct *task,
27 struct pt_regs *regs)
28{
29 return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0;
30}
31
32static inline long syscall_get_return_value(struct task_struct *task,
33 struct pt_regs *regs)
34{
35 return regs->regs[0];
36}
37
38static inline void syscall_set_return_value(struct task_struct *task,
39 struct pt_regs *regs,
40 int error, long val)
41{
42 if (error)
43 regs->regs[0] = -error;
44 else
45 regs->regs[0] = val;
46}
47
48static inline void syscall_get_arguments(struct task_struct *task,
49 struct pt_regs *regs,
50 unsigned int i, unsigned int n,
51 unsigned long *args)
52{
53 /*
54 * Do this simply for now. If we need to start supporting
55 * fetching arguments from arbitrary indices, this will need some
56 * extra logic. Presently there are no in-tree users that depend
57 * on this behaviour.
58 */
59 BUG_ON(i);
60
61 /* Argument pattern is: R4, R5, R6, R7, R0, R1 */
62 switch (n) {
63 case 6: args[5] = regs->regs[1];
64 case 5: args[4] = regs->regs[0];
65 case 4: args[3] = regs->regs[7];
66 case 3: args[2] = regs->regs[6];
67 case 2: args[1] = regs->regs[5];
68 case 1: args[0] = regs->regs[4];
69 case 0:
70 break;
71 default:
72 BUG();
73 }
74}
75
76static inline void syscall_set_arguments(struct task_struct *task,
77 struct pt_regs *regs,
78 unsigned int i, unsigned int n,
79 const unsigned long *args)
80{
81 /* Same note as above applies */
82 BUG_ON(i);
83
84 switch (n) {
85 case 6: regs->regs[1] = args[5];
86 case 5: regs->regs[0] = args[4];
87 case 4: regs->regs[7] = args[3];
88 case 3: regs->regs[6] = args[2];
89 case 2: regs->regs[5] = args[1];
90 case 1: regs->regs[4] = args[0];
91 break;
92 default:
93 BUG();
94 }
95}
96
97static inline int syscall_get_arch(void)
98{
99 int arch = AUDIT_ARCH_SH;
100
101#ifdef CONFIG_CPU_LITTLE_ENDIAN
102 arch |= __AUDIT_ARCH_LE;
103#endif
104 return arch;
105}
106#endif /* __ASM_SH_SYSCALL_32_H */