1#ifndef __ASM_SPARC_SYSCALL_H
2#define __ASM_SPARC_SYSCALL_H
3
4#include <uapi/linux/audit.h>
5#include <linux/kernel.h>
6#include <linux/sched.h>
7#include <asm/ptrace.h>
8#include <asm/thread_info.h>
9
10/*
11 * The syscall table always contains 32 bit pointers since we know that the
12 * address of the function to be called is (way) below 4GB.  So the "int"
13 * type here is what we want [need] for both 32 bit and 64 bit systems.
14 */
15extern const unsigned int sys_call_table[];
16
17/* The system call number is given by the user in %g1 */
18static inline long syscall_get_nr(struct task_struct *task,
19				  struct pt_regs *regs)
20{
21	int syscall_p = pt_regs_is_syscall(regs);
22
23	return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
24}
25
26static inline void syscall_rollback(struct task_struct *task,
27				    struct pt_regs *regs)
28{
29	/* XXX This needs some thought.  On Sparc we don't
30	 * XXX save away the original %o0 value somewhere.
31	 * XXX Instead we hold it in register %l5 at the top
32	 * XXX level trap frame and pass this down to the signal
33	 * XXX dispatch code which is the only place that value
34	 * XXX ever was needed.
35	 */
36}
37
38#ifdef CONFIG_SPARC32
39static inline bool syscall_has_error(struct pt_regs *regs)
40{
41	return (regs->psr & PSR_C) ? true : false;
42}
43static inline void syscall_set_error(struct pt_regs *regs)
44{
45	regs->psr |= PSR_C;
46}
47static inline void syscall_clear_error(struct pt_regs *regs)
48{
49	regs->psr &= ~PSR_C;
50}
51#else
52static inline bool syscall_has_error(struct pt_regs *regs)
53{
54	return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
55}
56static inline void syscall_set_error(struct pt_regs *regs)
57{
58	regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
59}
60static inline void syscall_clear_error(struct pt_regs *regs)
61{
62	regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
63}
64#endif
65
66static inline long syscall_get_error(struct task_struct *task,
67				     struct pt_regs *regs)
68{
69	long val = regs->u_regs[UREG_I0];
70
71	return (syscall_has_error(regs) ? -val : 0);
72}
73
74static inline long syscall_get_return_value(struct task_struct *task,
75					    struct pt_regs *regs)
76{
77	long val = regs->u_regs[UREG_I0];
78
79	return val;
80}
81
82static inline void syscall_set_return_value(struct task_struct *task,
83					    struct pt_regs *regs,
84					    int error, long val)
85{
86	if (error) {
87		syscall_set_error(regs);
88		regs->u_regs[UREG_I0] = -error;
89	} else {
90		syscall_clear_error(regs);
91		regs->u_regs[UREG_I0] = val;
92	}
93}
94
95static inline void syscall_get_arguments(struct task_struct *task,
96					 struct pt_regs *regs,
97					 unsigned int i, unsigned int n,
98					 unsigned long *args)
99{
100	int zero_extend = 0;
101	unsigned int j;
102
103#ifdef CONFIG_SPARC64
104	if (test_tsk_thread_flag(task, TIF_32BIT))
105		zero_extend = 1;
106#endif
107
108	for (j = 0; j < n; j++) {
109		unsigned long val = regs->u_regs[UREG_I0 + i + j];
110
111		if (zero_extend)
112			args[j] = (u32) val;
113		else
114			args[j] = val;
115	}
116}
117
118static inline void syscall_set_arguments(struct task_struct *task,
119					 struct pt_regs *regs,
120					 unsigned int i, unsigned int n,
121					 const unsigned long *args)
122{
123	unsigned int j;
124
125	for (j = 0; j < n; j++)
126		regs->u_regs[UREG_I0 + i + j] = args[j];
127}
128
129static inline int syscall_get_arch(void)
130{
131	return is_32bit_task() ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
132}
133
134#endif /* __ASM_SPARC_SYSCALL_H */
135