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

 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 */
12static 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
18static inline void syscall_rollback(struct task_struct *task,
19				    struct pt_regs *regs)
20{
21	/*
22	 * XXX: This needs some thought. On SH we don't
23	 * save away the original r0 value anywhere.
24	 */
25}
26
27static inline long syscall_get_error(struct task_struct *task,
28				     struct pt_regs *regs)
29{
30	return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0;
31}
32
33static inline long syscall_get_return_value(struct task_struct *task,
34					    struct pt_regs *regs)
35{
36	return regs->regs[0];
37}
38
39static inline void syscall_set_return_value(struct task_struct *task,
40					    struct pt_regs *regs,
41					    int error, long val)
42{
43	regs->regs[0] = (long) error ?: val;
 
 
 
44}
45
46static inline void syscall_get_arguments(struct task_struct *task,
47					 struct pt_regs *regs,
 
48					 unsigned long *args)
49{
 
 
 
 
 
 
 
50
51	/* Argument pattern is: R4, R5, R6, R7, R0, R1 */
52	args[5] = regs->regs[1];
53	args[4] = regs->regs[0];
54	args[3] = regs->regs[7];
55	args[2] = regs->regs[6];
56	args[1] = regs->regs[5];
57	args[0] = regs->regs[4];
 
 
 
 
 
 
58}
59
60static inline void syscall_set_arguments(struct task_struct *task,
61					 struct pt_regs *regs,
 
62					 const unsigned long *args)
63{
64	regs->regs[1] = args[5];
65	regs->regs[0] = args[4];
66	regs->regs[7] = args[3];
67	regs->regs[6] = args[2];
68	regs->regs[5] = args[1];
69	regs->regs[4] = args[0];
70}
71
72static inline int syscall_get_arch(struct task_struct *task)
73{
74	int arch = AUDIT_ARCH_SH;
75
76#ifdef CONFIG_CPU_LITTLE_ENDIAN
77	arch |= __AUDIT_ARCH_LE;
78#endif
79	return arch;
80}
 
81#endif /* __ASM_SH_SYSCALL_32_H */